Power transmission apparatus, method for remote control signal generation inside tubular structure and oil well

FIELD: oil production industry, particularly for power transmission and communication establishing through pipe string.

SUBSTANCE: apparatus comprises outer device adapted to transmit power and arranged around the first tubular structure. Outer device receives the first alternating current from the first tubular structure. Apparatus has inner device adapted to transmit power and arranged inside the first tubular structure near the outer device. The inner device generates the second current induced during the first current transmission to outer device. Outer device may include toroidal core transformer coil electrically linked with primary coil of solenoid transformer. Inner device may have secondary coil of solenoid transformer. Method for remote control signal generation involves arranging outer device around the first tubular structure; installing inner device inside the first tubular structure; transmitting main alternating current signal to the first tubular structure; initiating the first alternating current signal inside outer device and inducing remote control alternating current signal into inner device. Oil well comprises casing pipe with flow string arranged into the casing pipe. Outer devise is arranged outside casing pipe, inner device is installed around flow string near the outer one and is coaxial with it. Inner device is magnetically linked with outer device when alternating current is applied to outer device.

EFFECT: increased efficiency of electric power transmission from outer flow string pipe side to inner side thereof.

34 cl, 8 dwg, 1 ex

 

1. The technical field to which the invention relates.

This invention relates to oil well having a casing, which is used as a conductive path for transferring electric AC power and communication signals from the surface to downhole equipment located next to the casing tube, in particular, in that place, where the return path for the alternating-current circuit is used, the primer layer.

2. Description of the prior art,

The relationship between the two seats in oil or gas wells it is customary to carry out by means of cables and optical fibres for signal transmission between the places mentioned. In an oil well, of course, highly undesirable and practically difficult to use the cable laid along the column tubing that is either executed as a single unit with the column tubing, or is in the annular space between the casing tubing and casing pipe. The use of cables creates difficulties for operators of wells during Assembly and insertion of the column casing in the wellbore. In addition, the cable is subjected to corrosion and excessive wear due to the movement of the column tubing within the wellbore. Example IC is agenoy communication system, where cable is used, contained in document PCT/EP 97/01621.

In U.S. patent No. 4839644 described method and system of the wireless two-way communication in a cased wellbore having a tubing pipes. However, this system is characterized by the communication scheme designed for the transmission of electromagnetic energy in the mode of transverse electromagnetic waves (T-waves) using the annular space between the casing pipe and tubing. This transfer requires, essentially, the electroconductive fluid, such as formation oil in the annular space between the casing pipe and tubing. Therefore, the invention described in U.S. patent No. 4839644, has not found wide use as a practical scheme for two-way communication in the well.

Another communication system in the well, involving the use of telemetry pressure pulsations caused by the work of the mud pump described in U.S. patent No. 4648471 and 5887657. Although telemetering the pressure pulsation caused by operation of the mud pump, can be successful at low speeds, the benefits of such measurements is limited, if you need large data transfer speeds or if it is undesirable to have the sophisticated equipment to teleserials pressure, caused by the work of the mud pump in the well. Other means of communication within a well bore is described in U.S. patentâ„–â„–4468665, 4578675, 4739325, 5130706, 5467083, 5493288, 5576703, 5574374 and 5883516.

In the publication WO 93/26115 PCT application describes the overall system due to installation of an underwater pipeline. It is important that every scuba equipment, such as wellhead equipment must have its own independent source of power. In a preferred specific embodiment, the power source is a battery pack for launch operations and thermoelectric power generator for lengthy operations. For communication in the publication WO 93/26115 invited to submit an electromagnetic signal of very low frequency (VLF) or extremely low frequency (ELF) in the pipe, while the voltage level fluctuates around the level of the DC voltage. On Fig and 19 and accompanying text on pages 42 described a simple system and method of measuring pressure and temperature in the well. However, temperature sensors and pressure are passive (pressure gauge Bourdon and the bimetallic strip), and to achieve a resonant frequency related to temperature and pressure, causes mechanical displacement of the sensing element, making a change in the circuit. Search resonant peaks characteristic of pressure and temperature in the well, done is make by the oscillation frequency in the wellhead. The data obtained in the wellhead, are transmitted to the surface by cable or by using a pipeline communication system described in the publication WO 93/26115.

Therefore, if it were possible to develop an alternative means of communication and power transmission in the well, this would provide a significant advantage in the exploitation of oil wells. In addition, a significant advantage would enable location within the borehole devices such as sensors and controlled valves, the connection with which zapisywanie which would be carried out by the equipment on the surface of the well.

Citation of all sources referred to for reference in this description is carried out with the degree of completeness of the presentation, the maximum allowed by law. The extent to which the citation of any source that is cited here for reference, is incomplete, it is aimed at the description of the prior art and meets the qualifications of an ordinary person skilled in the technical field.

DISCLOSURE of INVENTIONS

This invention solves the problem of communication and power transmission inside an oil well. By connecting AC to the casing, in the wellbore, it is possible to transmit power and communication signals within the casing by using the project for an external device for transmitting power to the internal device for power transmission. Then the power and communication signals transmitted inside the casing can be used for operation of various downhole devices and manage them.

The apparatus for transmitting power corresponding to this invention, includes an external device for transmitting power, the configuration of which provides its location around the first tubular structure, and the internal device for power transmission, the configuration of which provides its location around the second tubular structure. An external device for transmitting power receives a first surface current of the first tubular structure. An external device for transmitting power has a magnetic coupling with an internal device for power transmission and therefore the first surface current induces a secondary current in the internal device for power transmission.

In yet another specific embodiment of this invention, the apparatus for transmitting power includes a similar external device for power transmission and internal device for power transmission, arranged around the first tubular structure and the second tubular structure, respectively. And again, between the two devices for power transmission has a magnetic connection. Internal device for power transmission has the configuration is especiauy the first in-situ current which induces a second downhole current in the external device for transmitting power.

In one embodiment, the first current received by the external device for transmitting power, is induced by the primary current flowing in the first pipe structure.

In one of the embodiments of the apparatus for transmitting power includes a second tubular structure, the configuration of which is its location inside the first tubular construction and arrangement of the device for power transmission in such a way that ensures axial alignment of internal devices for power transmission to an external device for transmitting power.

In one of the embodiments in the apparatus for power transmission section of the first tubular structure, located next to the external device for transmitting power, made of a nonmagnetic material.

In one of the embodiments in the apparatus for transmitting power an external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer.

In one of the embodiments in the apparatus for transmitting power an external device for transmitting power includes a coil toroidal transformer, e is ectrically connected with the primary coil of the solenoid transformer, while the first current is induced in the coil toroidal transformer primary alternating current signal supplied to the first tubular structure.

In one of the embodiments in the apparatus for transmitting power of an internal device for transmitting power includes a secondary solenoid coil of the transformer.

In one of the embodiments in the apparatus for transmitting power an external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer

internal device for transmitting power includes a secondary coil of the solenoid transformer

the first AC signal is induced in the coil toroidal transformer primary AC signal current flowing in the first pipe structure, and

the second AC signal is induced in the secondary coil of the solenoid transformer first alternating current signal flowing through the primary coil of the solenoid transformer.

In one of the embodiments in the apparatus for transmitting power of the first tubular structure is a casing tube, located inside the barrel of an oil well.

In one of the embodiments in the apparatus for precachemodel second tubular structure is a column tubing, located inside the barrel of an oil well.

In one of the embodiments in the apparatus for transmitting power of the first tubular structure is a casing tube, located inside the barrel of an oil well,

internal device for power transmission is connected with the casing inside the casing, and

the second alternating current signal induced in the internal device to transmit power used for transmitting power to the downhole device.

In one of the embodiments in the apparatus for transmitting power downhole device is a sensor for detecting physical characteristics.

Oil well, corresponding to this invention, includes a casing pipe and tubing pipes located inside the wellbore, and the column tubing is located in the casing pipe and goes inside in the longitudinal direction. Oil well additionally includes an external device for transmitting power, which is situated around the casing and having a magnetic coupling with an internal device for power transmission, which is located around the column tubing.

In one of the embodiments in an oil well, the first C is cash AC, flowing inside the external device for transmitting power, induces a second alternating current signal inside the interior of the device for power transmission.

In one of the embodiments in the first oil well downhole current flowing inside the interior of the device for transmitting power, induces a second downhole current within the external device to transmit power.

In one of the embodiments in an oil well external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer.

In one of the embodiments in an oil well internal device for transmitting power includes a secondary solenoid coil of the transformer.

In one of the embodiments in an oil well external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer

internal device for transmitting power includes a secondary coil of the solenoid transformer

the main signal of the alternating current flowing inside the casing, induces a first alternating current signal in the coil toroidal transformer, when the eat the first alternating current signal flows from the coil toroidal transformer in the primary solenoid coil of the transformer, and

the first alternating current signal flowing through the primary coil of the solenoid transformer induces a second alternating current signal in the secondary coil of the solenoid transformer.

In one of the embodiments in an oil well the main alternating current signal is fed into the casing of the equipment on the surface of the well.

In one of the embodiments in an oil well the main alternating current signal is a communication signal supplied to the casing of the downhole device.

In one of the embodiments in an oil well of the second AC signal provides power to the downhole device and the communication with him.

In one of the embodiments in an oil well external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer

internal device for transmitting power includes a secondary coil of the solenoid transformer

first downhole current flowing within the primary solenoid coil of the transformer and induces a second downhole current in a secondary coil of the solenoid transformer, and

second downhole current flowing in the coil Toro is yuandong transformer, induces the main borehole current inside the casing string.

In one of the embodiments in the first oil well downhole power is supplied to the second solenoid coil of the transformer downhole device.

In one of the embodiments in an oil well main well talk is a communication signal intended for communication between a downhole device and the equipment on the surface of the oil wells.

In one of the embodiments in an oil well main well talk is a communication signal intended for communication between the first downhole device and the second downhole device.

In one of the embodiments in an oil well section of the casing pipe under external device for transmitting power made of a nonmagnetic material.

In one of the embodiments in an oil well section of the casing pipe under external device for transmission capacity made of stainless steel.

The method of supplying current inside the first pipe structure includes a stage on which to set the external device to transfer the power and the internal device for transmitting power, which is the inductive coupling with an external device for transmitting power. External condition is the device for power transmission is located around the first tubular construction and has an inductive relationship with her, while the internal device for power transmission is located around the second tubular structure. The method also includes the steps that connect the main surface current to the first tubular structure and induce the first surface current within the external device to transmit power. The first surface current provides the final stage, which induce a second surface current inside the interior of the device for power transmission.

In one embodiment of the method of applying current setup external device for transmitting power additionally includes the steps in which

have the coil toroidal transformer around the first tubular structure,

have a primary solenoid coil of the transformer around the first tubular structure and

carry out the electrical connection of the coil toroidal transformer with the primary coil of the solenoid transformer.

In one embodiment of the method of applying current setup internal device for transmitting power additionally includes the stage, on which a secondary coil of the solenoid transformer around the second tubular structure located inside the first tubular structure, while the axial you shall animania secondary solenoid coil of the transformer with an external device for transmitting power.

In one embodiment of the method of applying current installation steps internal and external devices for power transmission additionally include steps, which

have the coil toroidal transformer around the first tubular structure,

have a primary solenoid coil of the transformer around the first tubular structure,

carry out the electrical connection of the coil toroidal transformer with the primary coil of the solenoid transformer and

have a secondary solenoid coil of the transformer around the second tubular structure located inside the first tubular structure, so that when this is done the axial alignment of the secondary solenoid coil of the transformer with the primary coil of the solenoid transformer.

In one embodiment of the method of applying current stages of induction of the first alternating current signal and the remote control signal AC additionally include steps, which

induce the first AC signal inside the toroidal coil of the transformer through the use of a primary alternating current signal flowing inside the first tubular structure,

skip the first AC signal from the coil toroidal the transformer to the primary solenoid coil of the transformer and

induce the remote control signal of the alternating current within the secondary solenoid coil of the transformer through the use of the first alternating current signal flowing within the primary coil of the solenoid transformer.

In one embodiment of the method of applying current to the first tubular structure is a casing pipe positioned within a barrel, oil wells, and the second tubular structure is a column of tubing inside the casing.

In one embodiment of the method of applying current transmission power in a downhole device and connection with it shall through the use of the remote control signal AC.

BRIEF DESCRIPTION of DRAWINGS

Figure 1 shows a cosmetic oil or gas well that has multiple places of renting of facilities in accordance with this invention, and the well has a casing tubing and casing pipe, located within the wellbore.

Figure 2 shows detailed cosmetic external device for transmitting power installed around the outer surface of the casing shown in figure 1.

Figure 3 shows the detailed cosmetic illustrating the magnetic coupling IU the external control device for power transmission, shown in figure 2, and an internal device for power transmission, located inside the casing pipe.

Figure 4 shows a graph depicting the results of the analysis design for the coil toroidal transformer in the form of the dependence of the optimal number of turns of the secondary winding is measured on the ordinate, the working frequency of the alternating current is measured on the abscissa.

Figure 5 shows a graph depicting the results of the analysis design for the coil toroidal transformer in the form of the dependence of the output current measured on the ordinate, relative permeability, put on the abscissa.

In "Example And" describes the construction analysis conducted for the design of the solenoid coil of the transformer and the design of the coil, toroidal transformer.

Figure 6-8 shows graphs depicting the dependence of the power consumption of the frequency and depth (or length) oil wells in various conditions specific conductivity of rocks and cement.

DETAILED description of the INVENTION

In that sense, what about her talking in this application, "tube design" may be a single pipe, casing pipe, casing pipe of a well, a group of mutually connected pipes, rods, rails, frames, gratings, lampposts, branch side continue the surveillance wells, a network of mutually connected pipes or other similar structures known to the ordinary skilled in the art. The preferred specific implementation involves the use of the invention as applied to an oil well in which the tubular structure contains columns of hollow conductive metal feed pipe or tubing, but the invention is not limited with this. For this invention, at least part of the pipe structure must be electrically conductive, and electrically conductive part may be all tube design (for example, steel pipes, copper pipes) or passing longitudinally conductive part, combined with a longitudinally passing electroconductive part. In other words, the conductive pipe design is a design that provides a conductive path from the first part, where electrically connected to the power source to the second part, where electrically connected to any device and/or a reverse electrical conductor. Tubular design in a typical embodiment, will be a regular round metal tubing pipe, but the geometry of the cross-section of tubular construction or any part thereof may vary according to the form (which may be, for example, KRU is Loy, rectangular, square, oval) and the size (e.g. length, diameter, wall thickness) along any part of the pipe structure.

"Valve" is any device that functions to regulate the flow of fluid. Examples of valves include, but are not in a restrictive sense gaslift valves bellows type and controllable gas-lift valves, each of which can be used to regulate the flow of gas rising in the column tubing of the well. Features of the internal and/or external processing valves can vary within wide limits, and in this application not be construed to limit the described valves any particular configuration, and stipulates only that the valve operates to regulate the flow. Some of the various types of flow control include, but are not in a restrictive sense, the configuration of ball valves, the configuration of the needle valve, the configuration of the shut-off valves and configuration of cell valves. How to install valves discussed in this application can vary widely. The valves can be installed within a wellbore in many different ways, some of which include installation configuration for roaming pipe configuration table of strychnine cameras, with side pockets, or configuration permanent installation, for example, causing the valve has been installed in the rod tubing having an increased diameter.

The term "modem" is used in this description mainly to refer to any communication device that is intended for transmitting and/or receiving electrical communication signals through an electrical conductor (e.g. metal). So in the sense in which it is used herein, this term is not reduced to the acronym of the terms "modulator" (a device that converts voice or data signals in some form in which it can be transferred) and "demodulator" (a device that takes the original signal after modulation of the RF carrier). Additionally, in the sense in which it is used in this description, the term "modem" is not limited to conventional computer modems, which convert digital signals to analog signals and Vice versa (for example, to send digital signals through the analog public switched telephone network (PSTN). For example, if the sensor generates signals in analog format, you may need only the modulation of such measurements (for example, modulation of a broader spectrum and transmission, therefore, analog-to-digital conversion is not Panadol the tsya. As another example, note that the transmitting and/or sub-modem or communication device may only need identification, filtering, amplification and/or retransmission of the received signal.

In the sense in which it is used in this description, the term "sensor" refers to any device that detects, identifies, monitors, registers, or otherwise perceives the absolute value of the changes in physical quantities. The sensors described in this application can be used to measure temperature, pressure (absolute or differential, i.e. the difference of pressure), flow, seismic data, acoustic data, pH, salinity levels, valve position, or almost all other physical data.

In the sense in which it is used here, the term "wireless" means the absence of a normal conductor with insulated housing, for example, going from downhole devices to the surface. Tubing and/or casing pipe is used as a conductor, is considered to be "wireless".

The term "electronic module" in this invention refers to a control device. Electronic modules can exist in many configurations and can be installed in the well in many different ways. One to the hence, adaptation to install the electronic module is actually located inside the valve provides control of the operation of the engine inside the valve. Electronic modules can also be installed outside of any particular valve. Some electronic modules will be installed inside the eccentric cameras with side pockets, or inside pockets large size for tubing, while others can be fixed to the column tubing. Electronic modules, often electrically connected to the sensors and facilitate the transmission of information from sensors on the surface of the well. It is clear that the sensors associated with a particular electronic module can even be enclosed inside the electronic module. And, finally, the electronic module is often closely linked to the modem for receiving, sending and transmission of communication signals from the surface of the borehole and at the surface, and may actually contain a modem. The signals received from the surface of the electronic module, often used to implement changes within well managed devices, such as valves. The signals sent or transmitted to the surface of the electronic module, as a rule, contain generated by the sensors information about the physical conditions inside the well.

In accordance with the terminology accepted in the field of oil production, the descriptive terms "upper", "lower", "up the wellbore and down in the wellbore"are relative and determine the distance along the shaft depth from the surface, which in inclined or horizontal wells can correspond or not correspond to a vertical elevation, measured relative to the conventionally accepted the zero level (zero elevation).

Referring to figure 1 of the drawings, note that it depicts an oil well 10 having a number of places 12 removal power. Oil well 10 includes a wellbore 14 wells extending from the surface 16 in the operating area 18, which is below the wellbore. Casing pipe, or the first pipe design, 24 is located in the bore 14 of the well and is the type that is typically used in the oil and gas industry. The casing 24 in a typical case installed in sections and secured on the shaft 14 wells during completion of the well with cement mortar 20. Column tubing, or the second pipe design, 26, or production tubing, as is usual, contains many elongated hollow pipe sections connected by threaded couplings at each end of the pipe sections. Column 26 of tubing suspended within the barrel 14 wells with hanging head 28 for tubing, so that the column 26 of tubing is concentric within the casing 24. Between alonei 26 of tubing and casing pipe 24 is formed the annular space 30. Oil or gas produced by oil wells 10, generally, is on the surface 16 through column 26 of tubing.

Column 26 of tubing serves as a support for a number of downhole devices 40, some of which may include wireless communication devices, such as modems or transceivers signals with spread spectrum, the sensors measuring such conditions in the well, as pressure or temperature, and/or control devices, such as motorized valves. The downhole device 40 can have many different functions and applications, some of which are described in the applications mentioned in this specification for reference. Global assignment downhole device 40 is to help build and maintain an efficient production from the well. This function is implemented by installing sensors that monitor physical conditions within the borehole and produces a report on the status of those conditions on the surface of the well. For change during the production wells are operated valves located inside the wells. By monitoring the physical conditions inside the well and comparing the obtained data with models of wells constructed using theoretical and empirical methods to mputer, located on the surface 16 of the wells can change the settings of the controllable valve, thereby regulating the entire production from the well.

Power and communication signals are transmitted to the downhole device 40 global locations 12 of the pickup. Each location 12 removal includes an external device 42 to transmit power, which is located concentrically around the outer surface of the casing 24, and the internal device 44 for transmitting power, which is located concentrically around the column 26 of tubing. The external device 42 to transmit power installed during installation of the casing 24 in the bore 14 of the well and before laying cement mortar 20 for completion. Completions cement mortar 20 fill in the space between the barrel 14 of the borehole and the casing tube 24, and this solution is used for further securing of the external device 42 to transmit power relative to the casing 24. Internal device 44 for transmitting power are located around the column 26 of tubing so that it is provided with an axial internal alignment device 44 for transmitting power from an external device 42 to transmit power.

To the casing tube 24 wells and the ground layer 61 connected to a source 60 of a large AC low voltage is possible. The current supplied by source 60 passes through the casing and gradually dissipates through the cement slurry 20 in the ground layer 61, as the cement slurry 20 forms a resistive current path between the casing tube 24 and the ground layer 61, i.e. cement mortar restricts the flow of current, but it is not a perfect electrical insulator. Thus, the current in the casing pipe at any specific location in the borehole represents the difference between the current supplied by source 60, and a current that is lost due to leakage through the cement slurry 20 in the ground layer 61 on the path between the surface 16 and this particular location in the well.

Referring to figure 2 of the drawings, note that here the external device 42 for power transmission is depicted in more detail. Each external device 42 for power transmission consists of a coil 62 toroidal transformer wound on a core having high magnetic permeability, and the primary coil solenoid 64 of the transformer. The coil winding 62 toroidal transformer electrically connected to the primary winding coil solenoid 64 of the transformer so that the current flowing in the windings of the coil 62 toroidal transformer, passes through the windings of the primary coil solenoid 64 of the transformer. Section 65 of the casing 24, passing quasi external device 42 to transmit power, made of a nonmagnetic material, such as stainless steel.

In operation, the main surface current moves in the casing 24. The main surface current will usually be supplied by the source 60, but it is clear that the casing tube 24 will be broadcast and the communication signal coming from the surface or from one of the downhole device 40. The main surface current has an associated magnetic field, which induces a first surface current in the windings of the coil 62 toroidal transformer. The first surface current induced in the coil 62 toroidal transformer, then passes through the primary winding coil 64 of the solenoid transformer, creating a solenoidal magnetic field inside the casing 24. In this magnetic field can be entered secondary coil solenoid 66 of the transformer, as shown in figure 3. Solenoidal magnetic field inside the casing 24 induces a second surface current in the windings of the secondary coil 66 of the solenoid transformer (smfg). This induced a second surface current can be used to transmit power to the downhole devices in a wellbore (i.e. sensors, valves and electronic modules), and to communicate with them.

Referring to figure 3 of the drawings, note that here in more detail depicted within Annee device 44 for transmitting power and the external device 42 to transmit power. Internal device 44 for transmitting power includes a secondary coil of the solenoid 66 of the transformer wound on a core 68 having a large magnetic permeability. Internal device 44 for transmitting power is located so that the secondary coil solenoid 66 of the transformer is immersed in a solenoidal magnetic field generated by the primary coil of the solenoid 64 of the transformer around the casing 24. The entire node coils 62 toroidal transformer, the primary coil solenoid 64 of the transformer and the secondary coil solenoid 66 of the transformer forms a means for providing power that is flowing through the casing tube 24 in place inside the casing 24. Obviously, this transfer of power is not sensitive to the presence of electrically conductive fluid, such as brine, inside the annular space 30 between the casing tube 24 and the column 26 of tubing.

Power and communication signals transmitted in the location 12 removal power is directed to one or more downhole devices 40. Figure 3 shows that the power is sent to the electronic module 70, which is electrically connected with a number of sensors 72 and controlled by valve 74. Electronic module 70 distributes power and communication signals to the sensors 72 and a controlled valve 74 as the need is and information sensors, and zapisywania valve and control them.

It should be obvious that although the focus in the description of this invention given the power transfer from the casing to the inner module, the entire system is reversible, so that the power and communication signals can also be transmitted from the internal device to transmit power to the casing pipe. In such a system, the communication signal, for example, the sensor data is sent from the electronic module 70 in the secondary coil of the solenoid 66 of the transformer. This signal is generated in the coil 66 of the transformer as the first in-situ current. This first downhole current has an associated solenoidal magnetic field, which induces a second downhole current in the windings of the primary coil solenoid 64 of the transformer. This second downhole current flows in winding the coils 62 a toroidal transformer, which induces the main borehole current in the casing tube 24. Then the main borehole current source transmits the signal from the electronic module 70 in other downhole device 40 or in the equipment on the surface 16 of the well. There are various forms of implementation, for example, the electronic module 70 may include a device for the accumulation and storage of energy such as a battery or capacitor. The battery or capacitor is charged during the normal is Oh. When it is desirable to transmit a signal from the module 70, the battery or capacitor provides power (brings power).

It should be noted that the use of the words "primary" and "secondary" in relation to the coils 64, 66 of the solenoid transformer is only a Convention, which should not be considered a limitation on the power transfer between the coils 64, 66 of the solenoid transformer.

When designing the coil 62 of the toroidal transformer and the primary coil solenoid 64 of the transformer it is necessary to consider a number of practical considerations. For protection against mechanical damage during installation and corrosion during operation, the coil is enclosed in epoxy shell, reinforced with fiberglass, or equivalent electroconductive material, and winding the coils is filled with epoxy or similar material to eliminate voids within the site of the windings. For compatibility with existing combinations of diameters of all wells and casing outer diameter of the finished unit coil (i.e. the external device 42 for transmitting power) must be no greater than the diameter of the clutch casing. For ease of manufacture or cost reduction may be desirable to create a coil 62 toroidal transformer from a sequence of tori, which are stacked on D. the uge on top of the casing, and their outputs are connected to transmit the total power. Typically, the total length of the node tori will be about two meters, and this is a relatively large value compared with the standard practice in the manufacture of toroidal transformers, so for this reason if no other, it is desirable to have the possibility of dividing the entire site, the sub-blocks.

Analysis design for the coil 62 of the toroidal transformer and the primary coil solenoid 64 of the transformer is performed on the basis of information about the standard operation of the transformer and with new geometric shapes, due to this invention. In the analysis design toroidal transformers the casing consider single-coil current of the primary winding. In the Example And presents a mathematical analysis of this design. Figure 4 illustrates the results of such analysis, design, and in this case they show how the optimal number of turns on the coil 62 toroidal transformer depends on the frequency of the AC power transmitted through the casing tube 24.

Figure 5 illustrates the results of the analysis, showing how the relative magnetic permeability of the material of the toroid core affects the amount of current applied to the load to a value of 10 Ohms, for three to provide the sustained fashion frequency power: 50 Hz, 60 Hz and 400 Hz. These results show the advantage of selecting materials with high magnetic permeability toroidal core transformer. Specific examples of materials candidates are permalloy, supermalloy and supermalloy-14, but in the General case, the basic requirement is the existence of a material having a low bias in Oersted magnetic field and with great saturation. The results also demonstrate the advantage of the frequency selection and the number of turns Carovigno winding for matching with an impedance load.

Construction analysis to determine the conductivity along the casing requires knowledge of the speed at which the power is lost from the casing into the formation. You can build a semi-analytical model to predict the distribution of electric current along such a cased wellbore. The decision will be recorded in the form of the integral, which quantify. The results obtained using this model were compared with published data, and they gave excellent agreement.

Under the terms of the problem there is a well, surrounded by a homogeneous rock, and between them laid in cement mortar. To the outer wall of the casing of the applied DC voltage. In relation to this invention the borehole MF is melting with infinite length, however, you can build a solution for a well of finite length. The results obtained by analysis of both models show that end effects are negligible for the considered cases.

The main objectives of the analysis to determine the conductivity along the casing are:

the calculation of the current transmitted along the borehole;

to determine the maximum depth at which one can observe a significant current;

study of the effect of managed parameters, in particular the conductivity in rocks and frequency.

To simplify the problem assume that the thickness of the casing is greater than the penetration depth of the field in it, which is true for all the considered cases. The result can be modeled well as a solid rod. Each material (pipes, cement, rocks) is characterized by a set of electromagnetic constant: specific conductivity σ, magnetic permeability μ and the dielectric constant ε. Properties of metals are well known; however, properties of rocks and cement vary considerably depending on dryness, saturation with water or oil. Therefore reviewed a number of different cases.

The main parameters that control the distribution of current along the casing wells the ins, is the specific conductivity of rocks. Usually it varies from 0.001 to 0.1 Cm/m In this study, three cases were considered: σrock=0,01, 0,05, 0,1 Cm/m To study the effect of conductivity of cement relative to the conductivity of the rocks analyzed case 2: σcementrockand σcementrock/16 (resistive cement mortar). In addition, making the assumption that the pipe was made from either carbon steel with an electric resistivity of about 18·10-8Ohm·m and a relative magnetic permeability varying from 100 to 200, or from stainless steel with an electric resistivity of about 99·10-8Ohm·m and a relative magnetic permeability equal to 1. A number of graphs showing the dependence of the power consumption of the frequency and depth (or length) in an oil well under different conditions on the conductivity of rocks and cement, is illustrated in Fig.6-8

A summary of the simulation results can be summarized as follows.

It is shown that a large current (the minimum value was 1 and corresponded to the applied voltage of 100 V) can be observed at depths up to 3000 m

If rock is not very power is roodney (σ rock=0.01 or less), you can use a wide range of frequencies (up to 60 Hz or even higher). This may be the case an oil-bearing formation.

For the less conductive rocks frequency should be less than about 12 Hz.

Generally speaking, stainless steel is the preferred material for the casing pipe; carbon steel has the advantage of only at very low frequencies (less than 8 Hz).

The presence of resistive cement between the casing pipe and the rock are useful in situations where the specific conductivity of the rocks is great.

Although many considered in this description and the examples can be viewed as an application of this invention in oil wells, the invention can also be applied to other types of wells, including, but not restrictively water wells and oil wells for the extraction of natural gas.

Specialist in the art will recognize that the invention can be applied in many areas where it is necessary to have a system of communication or feeding power inside the barrel, wells, or in any other area where difficult access. Specialist in the art also will recognize that the invention can be applied in many areas where existing conductive pipe design and the need to focus m is snost and communication signals in a certain place on this pipe structure. Water spray sprinkler system or network in a building designed for extinguishing fires is an example of a pipe structure that already exists and may be of the same or a similar path-and one that is desirable for the power and communication signals. In this case, another pipe design or another part of the same pipe structure can be used as an electrical return conductor. As of tubular construction and/or electrical return conductors for power transmission or communication signals in accordance with the present invention it is also possible to use a steel frame building. As of tubular construction and/or electrical return conductors for transmitting power and communication signals in accordance with the present invention it is possible to use steel rebar in a concrete dam or road surface streets. As of tubular construction and/or electrical return conductors for transmitting power and communication signals in accordance with the present invention it is possible to use a transmission line and a network of pipes laid between the wells or crossing large areas of land. As of tubular construction and/or electrical return conductors for transmitting power and communication signals in accordance with aseason invention can be used located on the surface of the network operating pipe refineries. Thus, there are many applications of the present invention in many different zones or areas of practice.

From the foregoing it should be apparent that the invention has significant advantages. Although this invention is shown only in a few forms, it should not be considered limited thereto, and determining the ability of various changes and modifications within its scope of claims.

Example

The design of the solenoid transformer

Using the model developed during the following output, you can calculate the input current and voltage to required parameters output voltage and load, or you would calculate the input current and output voltage for a fixed input voltage and load. These calculations are based on the following input parameters.

Sizes

The length of the inner core, lincrthe minimum diameter of the inner core Dmin,incrthe maximum diameter of the inner core Dmax,incrthe width of the gap between the inner and outer cores Wgapthe maximum diameter of the outer core Dmax,outcrthe length of the coils lcoilthe maximum diameter of the outer coil Dmax,coilthe number of turns of the primary coil of Nprimand the number of turns in arachnoi coil N sec.

Permanent materials

The fill factor of the copper wires Tou, the resistivity of copper magnet wire ρcuthe relative magnetic permeability of the inner and outer cores μr,incrand μr,outcrspecific losses in the cores, expressed in the form Rspec core=afαBβ

Working conditions

Temperature T, frequency f, the load resistance Rloadand the required input or output voltage Vinor Vout.

The magnetic resistance of the core set as follows:

where lcore- length, a acore- the cross-sectional area.

For the primary coil, the magnetic resistance is the sum of the external magnetic resistance of the core and the total magnetic resistance of the leakage path and the path through the gap and the inner core. Then the total magnetic resistance of the primary (or external) core set as follows:

where the value of Rm,gapdoubled, because the gap is crossed twice.

Similarly, the magnetic resistance of the secondary coil set as follows:

The cross-sectional area of the outer core set as follows:

and the length of the outer core is

The cross-sectional area of the inner core set as follows:

and the length of the inner core is

The cross-sectional area of the gap is set as follows:

The cross-sectional area to calculate the magnetic resistance of the leakage path set as follows:

and the length of the gap where the leak is

moreover, the value of dadv priand dadv,secoutput as follows:

The inductance of the two coils is divided into a primary member and a member of leakage:

Primary member denoted by the subscript m character. Then these members derive as follows:

The mutual inductance of the two coils are set as follows:

and the coupling coefficient is determined from the ratio

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which can be written in the form

The resistive losses in the core this configuration is very small compared with the losses in the inductive core and can be neglected.

Losses in the core set as follows:

where specific core loss are defined as follows:

Because in this model for both cores use the permalloy, the above equation is valid in both cases. Permanent materials in the case of permalloy are

a=2,4;

α=1,79;

β=2,01;

μr=35,00.

The parameter set as follows:

The core losses occurring in those parts of the cores, where the inner and outer cores are close, it is difficult to calculate, because in these parts there is no uniform density of the magnetic flux. To estimate these losses, it is necessary to make the assumption that the magnetic flux density in these parts is identical to the density of the magnetic flux in the middle parts of the cores. Then the effective volume of these parts, where there are losses in the core is determined by the requirement, according to which the total magnetic flux through these parts is identical to the total magnetic flux through the middle part. For in the calculations of core loss total effective amounts of both cores set as follows:

The resistance values of the cores cause the dispersion is approximately equal amounts of power, so these values are set as follows:

The transformer can be described as a transfer function, which can be set in a matrix representation

where

Combining the results for toroidal and solenoidal transformer, it is possible to represent the transfer function of the entire system in the form

where the matrices S and T correspond to the definitions given above.

1. Apparatus for power transmission containing an external device for transmitting power, the configuration of which provides its location around the first tubular structure, and the configuration of the external device to transmit power provides a first alternating current from the first tubular structure, the inner structure for power transmission, the configuration of which provides its location inside the first pipe structure very near to the external device for transmitting power, the internal device for power transmission ensures the production of the second current is induced when the first AC power is supplied to the external device for transmitting power.

2. Apparatus for power transmission according to claim 1, in which the first current received by the external device for transmitting power, is induced by the primary current flowing in the first pipe structure.

3. Apparatus for power transmission according to claim 1, comprising a second tubular structure, the configuration of which is its location inside the first tubular construction and arrangement of the device for power transmission in such a way that ensures axial alignment of internal devices for power transmission to an external device for transmitting power.

4. Apparatus for power transmission according to claim 1, in which the section of the first tubular structure, located next to the external device for transmitting power, made of a nonmagnetic material.

5. Apparatus for power transmission according to claim 1, in which the external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer.

6. Apparatus for power transmission according to claim 1, in which the external device for transmitting power includes a coil toroi the material of the transformer, electrically connected with the primary coil of the solenoid transformer, and the first current is induced in the coil toroidal transformer primary alternating current signal supplied to the first tubular structure.

7. Apparatus for power transmission according to claim 1, in which the internal device for transmitting power includes a secondary solenoid coil of the transformer.

8. Apparatus for power transmission according to claim 1, in which the external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer, an internal device for transmitting power includes a secondary solenoid coil of the transformer, the first AC signal is induced in the coil toroidal transformer primary AC signal current flowing in the first pipe structure, and the second AC signal is induced in the secondary coil of the solenoid transformer first alternating current signal flowing through the primary coil of the solenoid transformer.

9. Apparatus for power transmission according to claim 1, in which the first tubular structure is a casing tube, located inside the barrel of an oil well.

10. Apparatus for power transmission according to claim 3, in which the second t is ubna design is a string of tubing, located inside the barrel of an oil well.

11. Apparatus for power transmission according to claim 1, in which the first tubular structure is a casing tube, located inside the barrel of an oil well, an internal device for power transmission is connected with the casing inside the casing, and the second alternating current signal induced in the internal device to transmit power used for transmitting power to the downhole device.

12. Apparatus for power transmission according to claim 1, in which the downhole device is a sensor for detecting physical characteristics.

13. Oil well having a well bore containing well casing situated in the wellbore and passing in the longitudinal direction, the column tubing located in the casing pipe and passing inside in the longitudinal direction, an external device for transmitting power, which is situated around the casing, and an internal device for power transmission, located around the column tubing and made with the possibility of the location next to the external device for transmitting power and ensuring axial alignment with him so that the internal device for power transmission is the magician who itnow connection with an external device for transmitting power, by means of the alternating current supplied to the external device for transmitting power.

14. Oil well according to item 13, in which the first alternating current signal flowing inside the external device for transmitting power, induces a second alternating current signal inside the interior of the device for power transmission.

15. Oil well according to item 13, in which the first downhole current flowing inside the interior of the device for transmitting power, induces a second downhole current within the external device to transmit power.

16. Oil well according to item 13, in which the external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer.

17. Oil well according to item 13, in which the internal device for transmitting power includes a secondary solenoid coil of the transformer.

18. Oil well according to item 13, in which the external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer, an internal device for transmitting power includes a secondary solenoid coil of the transformer, the primary AC signal flowing inside obidnitsya, induces a first alternating current signal in the coil toroidal transformer, and the first alternating current signal flows from the coil toroidal transformer in the primary solenoid coil of the transformer and the first AC signal flowing through the primary coil of the solenoid transformer induces a second alternating current signal in the secondary coil of the solenoid transformer.

19. Oil well on p, in which the main signal of the alternating current is fed into the casing of the equipment on the surface of the well.

20. Oil well on p in which a primary AC signal is a communication signal supplied to the casing of the downhole device.

21. Oil well on p, in which the second AC signal provides power to the downhole device and the communication with him.

22. Oil well according to item 13, in which the external device for transmitting power includes a coil toroidal transformer, electrically connected with the primary coil of the solenoid transformer, an internal device for transmitting power includes a secondary solenoid coil of the transformer, the first downhole current flowing within the primary coil of the solenoid transformer, inducere the second downhole current in a secondary coil of the solenoid transformer, and the second downhole current flowing in the coil toroidal transformer induces a primary borehole current inside the casing string.

23. Oil well on p.22, in which the first downhole power is supplied to the second solenoid coil of the transformer downhole device.

24. Oil well on p.22, in which the main borehole talk is a communication signal intended for communication between a downhole device and the equipment on the surface of the oil wells.

25. Oil well on p.22, in which the main borehole talk is a communication signal intended for communication between the first downhole device and the second downhole device.

26. Oil well on p.22, in which the section of casing pipe under external device for transmitting power made of a nonmagnetic material.

27. Oil well on p.22, in which the section of casing pipe under external device for transmission capacity made of stainless steel.

28. The method of manufacture of the remote control signal AC inside the pipe structure, namely, that set the external device to transmit power configuration that provides its location around the first pipe structures, establish in the morning a device for power transmission, configuration which provides its location inside the first tubular structure, connect the main AC signal to the first tubular structure, induce the first AC signal within the external device to transmit power through the use of inductive coupling between the first tubular structure and an external device for transmitting power and induce the remote control signal AC inside the interior of the device for transmitting power by inductive coupling between an external device for transmitting power and an internal device for power transmission.

29. The method according to p at which stage of the installation of an external device for transmitting power additionally includes the steps, which have a toroidal coil of the transformer around the first tubular structure, have the primary solenoid coil of the transformer around the first tubular structure and carry out the electrical connection of the coil toroidal transformer with the primary coil of the solenoid transformer.

30. The method according to p at which stage of the installation of internal devices for power transmission additionally includes the stage, on which a secondary coil of the solenoid transformer around the second tubular structure located inside the first tubular structure, while the axial alignment of the secondary solenoid coil of the transformer with an external device for transmitting power.

31. The method according to p at which stages of the installation of internal and external devices to transmit power additionally include steps, which have a toroidal coil of the transformer around the first tubular structure, have the primary solenoid coil of the transformer around the first tubular structure, carry out the electrical connection of the coil toroidal transformer with the primary coil of the solenoid transformer and includes a secondary coil of the solenoid transformer around the second tubular structure located inside the first tubular structure, so that when this is done the axial alignment of the secondary solenoid coil of the transformer with the primary coil of the solenoid transformer.

32. The method according to p at which stages of the induction of the first alternating current signal and the remote control signal AC additionally include steps, which induce the first AC signal inside the toroidal coil of the transformer through the use of a primary alternating current signal flowing inside the first tubular structure, pass the first AC signal from the coil toroidal transformer in the primary coil of the solenoid transformer and induce the remote control signal of the alternating current in the secondary coil of the solenoid transformer by use of the first alternating current signal flowing within the primary coil of the solenoid transformer.

33. The method according to p, in which the first tubular structure is a casing pipe positioned within a barrel, oil wells, and the second tubular structure is a column of tubing inside the casing.

34. The method according to p, in which the transmission of power to the downhole device and the connection with it shall through the use of the remote control signal AC.



 

Same patents:

FIELD: oil well operation, particularly to supply power or control signal into well.

SUBSTANCE: method involves installing packer having power-operated device and pipeline structure having electroconductive part into oil well; bringing the packer into working position; electrically connecting power-operated device with electroconductive part of pipeline structure; installing inductance choke located around electroconductive part of pipeline structure and bringing thereof into working position; applying time-alternating current to pipeline structure; directing part of electric current trough power-operated device by means of inductance choke and performing oil production. Casing pipe or ground surrounding the well may be used as return circuit. Packer power-operated device has electrically controlled valve which manages fluid flow between packer sides and communication and control module electrically linked with the valve. Communication and control module comprises modem for receiving control commands coded in communication signals. Communication and control module performs decoding of control commands received with the use of modem and operates valve slide with the use of control command when the packer is installed in the working position. Power-operated device may have sensor and modem, which transmits data received by sensor in the form of electric communication signal, wherein the data demonstrates at least one physical characteristic.

EFFECT: improved oil production control due to possibility to perform real-time control of power-operated device included in packer.

20 cl, 4 dwg

FIELD: oil well operation, particularly to supply power and communication signals to downhole device.

SUBSTANCE: oil well has borehole with pipe structure arranged inside the borehole, communication system performing transmission of time-varying signal along pipe structure, as well as hydraulic system electrically linked with pipe structure and adapted to be connected to downhole device, to receive power and to control downhole device. Communication system also has impedance device arranged around pipe structure to form conductive section in which signal interference is provided, wherein the signal is current. To operate downhole device working liquid pressure is increased with the use of current. Hydraulic drive system comprises electric drive for above signal receiving, which activates pump to increase working liquid pressure. Connected to pump is drive actuated by working liquid and connected to downhole device in its working position to operate the downhole device. Signal may include communication signal to selectively operate downhole device, particularly valve.

EFFECT: decreased electric power losses during signal transmission to downhole device.

26 cl, 6 dwg

FIELD: oil industry, particularly to supply and store power necessary for downhole device and appliance operation in oil well.

SUBSTANCE: power supply system has current impedance device arranged around borehole pipeline structure and adapted for at least partial defining supply part to transfer alternate current through and along conductive pipeline structure part. System also has power storing device adapted to be electrically connected to conductive pipeline structure part, to be discharged with alternate current and to be linked with downhole device so supply power thereto. Embodiments of oil well structure including above system are also disclosed, as well as oil well operation method and power supply method with the use of the described system.

EFFECT: improved stability of power supply to downhole devices and appliances.

37 cl, 8 dwg

FIELD: oil production industry, particularly to perform fluid flow control during oil extraction process.

SUBSTANCE: well has casing pipe with a plurality of perforated sections and production string located inside casing pipe. Alternating current source electrically linked with at least one of casing pipe and production string is located on ground surface and serve to conduct alternating current from ground surface into well through casing pipe or production string. Controlled well section is also provided. Controlled well section includes communication and control unit electrically linked with at least one of casing pipe and production string and having sensing means and electrically operated valve connected thereto. Communication and control unit is adapted to regulate flow between outer and inner production string parts at least partly in accordance with sensing means measurements. To extract oil a number of controlled well sections are provided. Some controlled well sections have flow limiter retarders located around production string part to prevent fluid flow between controlled well sections. Fluid characteristic is measured in each controlled well section and fluid flow is regulated on the base of performed measurements at least in one controlled well section with the use of valves. Then oil is extracted from well through production string. Fluid injection is performed along with control fluid flow from inner production string part to outer one with the use of above method, wherein each controlled well section is provided with above flow retarder. Packer or electrically operated packer comprising electrically operated valve or expanded production string part or sleeve located around production string in perforated casing pipe section may be used as the flow retarder. Flow, pressure or fluid density transducers or acoustic signal converter may be used as the sensing means.

EFFECT: provision of dynamic oil extraction process control for optimization thereof.

32 cl, 6 dwg, 3 ex

FIELD: oil producing industry; testing facilities.

SUBSTANCE: invention relates to pumping facilities. Proposed ejector multifunctional formation tester has mechanical or hydromechanical packer installed on tubing string for fixed positioning in released state in well at preset depth, jet pump accommodating nozzle and mixing chamber with diffuser in its housing, and stepped through channel is made with possibility of fitting functional inserts, for instance, functional insert for recording pressure built up curve. Jet pump is located in casing string over well producing formations, self-contained logging complex is installed lower than packer on tubing string for measuring, for instance, specific electric resistance of rock or for action onto formation by physical fields, for instance, acoustic fields, and second additional packer is installed being made of elastic material in form of open-top cup with conical side wall. Cup bottom is hermetically secured on tubing string, and ring is arranged on rubbing string lower than additional packer for centering packer in casing string, distance between packers being not less than outer diameter of tubing string in place of mounting of additional packer. Thanks to it intensification of investigation and testing of wells with open or cased hole, primarily crooked or horizontal ones, optimization of arrangement of packers at their operation together with jet pump and self-contained logging complex are provided.

EFFECT: improved reliability of operation of well jet plant.

2 cl, 1 dwg

FIELD: oil producing industry; pump facilities.

SUBSTANCE: according to proposed method, the following devices are mounted on tubing string in turn from top to bottom: jet pump, upper mechanical packer, lower packer made of elastic material, centering ring, and, on lower end of tubing string with perforated section, self-contained logging complex is installed and said assembly is lowered into on tubing string. In process of lowering, recording of background values of rock physical fields is done and when self-contained logging complex reaches design depth, upper mechanical packer is released and functional insert is installed in stepped through channel of jet pump to record pressure built up curves and then, by delivering liquid medium into nozzle of jet pump, at least three step rising values of drawdowns are built in underpacker zone and by measuring amounts of pumped out liquid on surface during each down, yields are found, and then drawdowns are built additionally and rock physical fields are recorded by self-contained logging complex.

EFFECT: improved reliability and increased capacity at investigation and testing of formations in wells with walls not strengthened by casing string, improved accuracy of geological-field information at earlier stages of well building.

2 cl, 3 dwg

FIELD: oil producing jet units.

SUBSTANCE: proposed formation tester contains jet pump, unit for connecting and disconnecting tubing string, valve unit with seat for valve insert with check valve, packer and liner with intake funnel, all mounted on tubing string from top to bottom. Jet pump housing accommodates coaxially installed active nozzle and mixing chamber, and channels are made to deliver active medium, pumped out of well and stepped through channel with seat between steps. Possibility is provided for in-turn mounting of sealing unit and interlock insert with through channel which are arranged on flexible smooth pipe higher than tip for connecting self-contained logging complex and insert for recording pressure built-up curves I underpacker space of well under which self-contained instruments are installed for recording pressure, temperature and other physical parameters of well and forming fluids. Invention provides intensification of investigation, testing and preparation of wells, mainly, horizontal and high curvature wells, optimization of operation of jet pump used together with self-contained logging complex and other functional insets for investigation of producing formation.

EFFECT: improved reliability and increased capacity of operation.

3 cl, 3 dwg

FIELD: oil producing industry; pump facilities.

SUBSTANCE: method comes to mounting the following device onto tubing string: pump with through channel, packer and liner with intake funnel, lowering the assembly into well, releasing the packer and creating required drawdown in underpacker zone by pumping liquid medium out of underpacker zone by jet pump. Assembly is furnished additionally with unit for disconnecting and connecting tubing string, and valve unit with seat for mounting check valve, and then tubing string is assembled in definite sequence. After these operation, investigation, testing and completion of well are carried out. Then well is set in operation.

EFFECT: intensified investigation, testing and completion of horizontal crooked wells, improved reliability of formation tester.

2 cl, 3 dwg

FIELD: mining industry.

SUBSTANCE: system has first induction throttle, second induction throttle and controlled switch. Second induction throttle is positioned near second branch of pipeline structure. Controlled switch has two outputs. First switch output is electrically connected to pipeline structure on the side of induction throttles connection, where first and second branches of pipeline structure intersect. Second output of switch is electrically connected to pipeline structure on other side of at least one induction throttle. Pipeline structure can be positioned inside oil well, and can have casing string and operation tubing column. Also described is method for extracting oil products from oil well using said system.

EFFECT: higher efficiency.

4 cl, 10 dwg

FIELD: oil industry.

SUBSTANCE: at least one acoustic dynamic is mounted immediately on product pipe in oil well and acoustic characteristic of flowing environment flow is determined in product pipe. It is sent into surface controller, using product pipe. Using surface controller flowing substance flowing mode is determined, on basis of which working parameters of oil well are adjusted. Working parameters of oil well can be adjusted to detect Taylor mode of flow. For adjustment of working parameters throttle is used and/or controlled valve of oil well, controlling amount of gas, forces into product pipe. For determining mode of flow of flowing environment artificial neuron net can be used. It is possible is provide energy for acoustic sensor through product pipe. It is possible to determine additional physical characteristics of flowing substance, for example pressure and temperature.

EFFECT: higher efficiency.

3 cl, 22 dwg

FIELD: oil well operation, particularly to supply power or control signal into well.

SUBSTANCE: method involves installing packer having power-operated device and pipeline structure having electroconductive part into oil well; bringing the packer into working position; electrically connecting power-operated device with electroconductive part of pipeline structure; installing inductance choke located around electroconductive part of pipeline structure and bringing thereof into working position; applying time-alternating current to pipeline structure; directing part of electric current trough power-operated device by means of inductance choke and performing oil production. Casing pipe or ground surrounding the well may be used as return circuit. Packer power-operated device has electrically controlled valve which manages fluid flow between packer sides and communication and control module electrically linked with the valve. Communication and control module comprises modem for receiving control commands coded in communication signals. Communication and control module performs decoding of control commands received with the use of modem and operates valve slide with the use of control command when the packer is installed in the working position. Power-operated device may have sensor and modem, which transmits data received by sensor in the form of electric communication signal, wherein the data demonstrates at least one physical characteristic.

EFFECT: improved oil production control due to possibility to perform real-time control of power-operated device included in packer.

20 cl, 4 dwg

Well killing fluid // 2262589

FIELD: oil production industry, particularly to kill gas-condensate and oil wells with the use of special fluids before well-workover operation performing, especially under low temperatures.

SUBSTANCE: well killing fluid comprises 65-85 % by volume of alcoholized floatation agent - oxal, remainder is water.

EFFECT: increased frost-resistance, reduced density, plastic viscosity and dynamic shearing stress, possibility to maintain collecting properties of payout beds.

3 ex, 1 tbl

Well killing fluid // 2262588

FIELD: oil production industry, particularly to kill gas-condensate and oil wells with the use of special fluids before well-workover operation performing, especially under low temperatures and abnormally low formation pressure.

SUBSTANCE: well killing fluid mainly includes aliphatic alcohol and water. Hydrolyzed floatation agent - oxal and floatation agent - oxal are included in well killing fluid. Above components are taken in the following amounts (% by volume): flatation agent - 20-45, hydrolyzed floatation agent - 25-35; aliphatic alcohol - 20-35, remainder is water. Aliphatic alcohol is ethyl, isopropyl or butyl alcohol.

EFFECT: reduced density, increased frost-resistance, as well as funnel viscosity and plastic viscosity of well killing fluid; possibility to maintain collecting properties of payout bed.

2 cl, 3 ex, 1 tbl

Well killing fluid // 2262587

FIELD: oil production industry, particularly to kill gas-condensate and oil wells with the use of special fluids before well-workover operation performing, especially under low temperatures.

SUBSTANCE: well killing fluid mainly includes polyglycoles, aliphatic alcohol and water. Hydrolyzed floatation agent - oxal is additionally introduced in well killing fluid. Above components are taken in the following amounts (% by volume): glycols - 5-30; hydrolyzed floatation agent - 55-70; aliphatic alcohol - 10-15; remainder is water. Aliphatic alcohol is ethyl, isopropyl or butyl alcohol.

EFFECT: reduced foam formation, increased frost-resistance possibility to maintain collecting properties of payout bed.

2 cl, 3 ex, 1 tbl

FIELD: hydrocarbon (oil, gas, gas condensate, gas-hydrate or mixture) production and formation pressure maintaining means in multiplay fields and, particularly, for simultaneous separate, as well for periodical or successive operation of several production facilities (production formations or interlayers) by single (blower, gas-lift, beam, injection and so on) boreholes.

SUBSTANCE: plant comprises one or several pipe strings lowered and installed in borehole. At least one pipe string is provided with at least two devices, namely with packer and disconnector. The plant may be separated from packer and removed from the borehole after lowering and leak-proof fitting of at least one packer in pipe string. Then pipe string having lesser, equal or greater diameter and provided with one or several devices, namely packer, disconnector, may be lowered and installed in the borehole. The disconnector comprises two removable and fixed parts, one or several borehole chambers with releasable valves, telescopic connection and pump. Pipe string is lowered directly in the borehole or in pipe string having greater diameter or is connected in leak-proof manner but loosely with corresponding fixed packer through disconnector. Pipe string bottom below packer installed above or under lower formation is hydraulically isolated or connected with borehole bottom.

EFFECT: increased technological efficiency and plant reliability.

23 cl, 38 dwg

FIELD: oil and gas industry.

SUBSTANCE: composition has carbon-methyl-cellulose, sodium hydroxide, copper sulfate, admixture and water, as admixture salt-precipitation inhibitor is added with following ration of components in percents of mass: carbon-methyl-cellulose 3,5-4,5, sodium hydroxide - 1,5-2,0, copper sulfate - 0,3-0,4, salt precipitation inhibitor - 0,5, water - the rest.

EFFECT: higher reliability, higher quality, higher efficiency, broader functional capabilities.

1 tbl

FIELD: oil and gas production industry, particularly to develop oil and gas deposits in which gas, oil and water reservoirs are separated with impermeable rock layers.

SUBSTANCE: method involves drilling horizontal wells of two types. Well of the first type has cased side hole with sealed hole annuity directed upwards to cross impermeable layer and to open-up gas reservoir. Wells of this type are used as production ones. Well of the second type additionally have cased side holes with sealed hole annuity directed downwards to cross down impermeable layer and to open-up high-pressure water reservoir. Above wells are initially used as production ones, then as injection wells and once again as production ones. Control of gaseous or liquid product cross flow between reservoirs and inside reservoir is performed with the use of bypass regulating devices installed in wells between production reservoirs and energy-supply ones. The devices are operated from ground surface.

EFFECT: increased flowing time and oil output due to possibility to save reservoir energy, to control cross flow of gaseous or liquid product between reservoirs and inside reservoir.

5 dwg

Well killing method // 2260680

FIELD: gas production equipment, particularly for killing wells with reservoir pressure below hydrostatic pressure and for gas pipeline protection against water and mechanical impurities.

SUBSTANCE: method involves injecting methylcellulose used as gel-forming composition into well, wherein methylcellulose is introduced as foamed aqueous solution and density thereof may be regulated along the whole well borehole height.

EFFECT: possibility to regulate well killing liquid density along well borehole height, increased speed of well killing gel-forming composition production.

FIELD: oil well operation, particularly to supply power and communication signals to downhole device.

SUBSTANCE: oil well has borehole with pipe structure arranged inside the borehole, communication system performing transmission of time-varying signal along pipe structure, as well as hydraulic system electrically linked with pipe structure and adapted to be connected to downhole device, to receive power and to control downhole device. Communication system also has impedance device arranged around pipe structure to form conductive section in which signal interference is provided, wherein the signal is current. To operate downhole device working liquid pressure is increased with the use of current. Hydraulic drive system comprises electric drive for above signal receiving, which activates pump to increase working liquid pressure. Connected to pump is drive actuated by working liquid and connected to downhole device in its working position to operate the downhole device. Signal may include communication signal to selectively operate downhole device, particularly valve.

EFFECT: decreased electric power losses during signal transmission to downhole device.

26 cl, 6 dwg

Well killing fluid // 2260112

FIELD: oil production industry, particularly for filling oil and gas-condensate wells with special fluids before well workover, especially at low temperatures.

SUBSTANCE: well-killing fluid includes polyglycols, aliphatic alcohol and water. The fluid additionally has flotation agent-oxal. Above components are taken in the following amounts (% by volume): polyglycols - 5-35, flotation agent-oxal - 45-65, aliphatic alcohol - 15-20, remainder - water. Isopropyl, ethyl or butyl alcohol is used as the aliphatic alcohol.

EFFECT: increased frost-resistance and viscosity, prevention of foaming and reduced permeability of bottomhole zones by reason of well killing.

2 cl, 3 ex, 1 tbl

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

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