Method for information transmission via electromagnetic communication channel at operation of well, and device for its implementation

FIELD: oil and gas industry.

SUBSTANCE: method consists in excitation of an electric current in a metal string in a well by means of a ground-based generator connected with one contact to surface part of the metal string and with the other contact to a receiving electrode on the well surface. Commutation of a dielectric insert dividing the metal string in the well into upper and lower parts is performed. Another string of metal pipes lowered to that well is used as the receiving electrode. Therefore, an electric circuit of a metal string in the well and a receiving electrode is formed, via which direct current stabilised as to the value is transmitted from the ground-based generator. Reception of information from the well working face is performed depending on modulation of the value of stress caused by commutation of the dielectric insert. As a ground-based generator there used is a source of stabilised direct current, and as a receiving electrode there can be used a metal string of the tubing.

EFFECT: improving reliability of information transmission from the working face via an electromagnetic communication channel and enlarging the application scope.

4 cl, 1 dwg

 

The proposed group of inventions relates to the field of downhole data transmission from the well to the surface electromagnetic communication channel and can be used for logging in the operation.

There is a method of creating electromagnetic communication channel, which consists in the excitation of the electric current in the column of metal tubes separated by a dielectric insert, and registration on the surface of the induced potential difference between the column of drill pipe and a remote point from the wellhead. This induced potential is modulated appropriately coded signal (information), but are required for the excitation current energy is generated on the face by a downhole generator, discharging of the power flow of washing fluid generated by the drilling pump (A.A. Molchanov, G.S. Abramov. Wireless system for studies of oil and gas wells (theory and practice) / Under the General editorship of A.A. Molchanov - Moscow: JSC "VNIIEM", 2003).

The disadvantages of the method are unstable signal magnitude associated with the changing conditions of the currents in soils and limited downhole power generator, and the inability to use without hole (borehole) energy source, which limits the scope of the system.

Know the ten method of downhole data transmission by electromagnetic communication channel by generating information in the form of electrical signals and transmit them to the mouth of the well, the string of drill pipes with electric separator, in this case, before transmitting information to a string of drill pipe above electrical separator serves DC voltage (U.S. Pat. Of the Russian Federation No. 2426878, prior. 02.02.2010, publ. 20.08.2011). In a borehole containing a column of drill pipe with an electric separator, include a downhole transmitter connected to the upper and lower electrodes of the separator. At the wellhead place the constant voltage source connected to the column of drill pipe and at the other end through the receiving device with the receiving electrode. Constant voltage polarizes the metal surface of the drill pipe, creating on the metal surface of the electrical double layer, which reduces the surface conductivity of the metal, preventing the closure of the current transmission on the column of drill pipe, thereby increasing the power of the received signal.

A disadvantage of the known solution is the use of downhole transmitter, which is limited by the capacity of a standalone power source, which, as mentioned above, limits the scope of application of the device.

The known method of transmission/reception geophysical data during the drilling of the wireless electromagnetic communication channel from downhole to the surface (U.S. Pat. Of the Russian Federation No. 2273732, prior. 21.05.2004, publ. 10.04.2006).

In the known method modulate the voltage generating signal to the surface by connecting the poles of land generator respectively to the string of drill pipe and a remote point from the wellhead (receiving electrode) and the bottom electric the dipole carry out signal ground of the generator. Allocate a clock frequency of ground generator and synchronous with her commute the encrypted message, the electric dipole on the bottom. At the wellhead measure the current generation by highlighting pulsations using synchronous detection. Measured at the mouth of the magnitude of the ripple caused by the switching of the electric dipole on the face, judge geophysical parameters to be drilled formation on the surface. The frequency of ground generator on the surface change for better conditions of signal reception on the face.

The disadvantage of this method is that it assumes, in the electric dipole receiver signal from a ground-based generator, which determines the frequency at which the electric dipole should be switched, which complicates the design of an electric dipole.

The distance from the wellhead grounding electrode weakens the signal, which passes through the rock with different geological properties, the signal may disappear (in salt interlayers) and distorted with the passage of weakly conductive layers and the reliability of communication falls.

The task of the group of inventions is to improve the reliability of information transmission from downhole electromagnetic communication channel and the expansion of its p is imeneniya.

This task is solved in that in the method of transmitting information by electromagnetic communication channel during well operation, comprising the excitation electric current in a metal casing in a well using ground-based generator that is connected to one contact to ground the metal parts of the column and the other contact to the receiving electrode on the surface of the well, switching the dielectric insert that separates the metal column in the well on the upper and lower parts, and obtaining information from the borehole bottom, depending on the ripple caused by the switching of the dielectric insert, as the receiving electrode use a different column of metal pipes, lowered into the well, and create the electrical circuit of the metal column in the well and the reception electrode, which is passed stabilized constant current from the ground of the generator, while obtaining information from the borehole bottom is carried out in dependence on the modulation voltage required to stabilize the DC ground of the generator (source of stabilized voltage) when the change in the effective value of the resistance of steel columns, caused by the switching of the dielectric insert. As the receiving electrode is used, for example, a metal pump is about tubing (tubing), which is concentric with a metal column with a dielectric insert.

Applying the device to implement the method, containing ground the generator is connected with one contact to ground the metal parts of the column and the other contact to the receiving electrode on the surface of the borehole, dielectric insert that separates the metal column in the well on the upper and lower parts, the key to opening and closing of the contacts of the upper and lower parts of the metal columns, where as the ground of the generator used source of the stabilized DC, and between the said contacts has a recording unit changes the voltage of this current, in addition, as the receiving electrode used another column of metal pipes, lowered into the borehole, for example, Tubing, in which concentric metal column, for example, a column of hollow metal rods with dielectric insert. The upper part of the metal columns and tubing are isolated from each other.

The figure presents the device to implement the method.

The essence of the method. When operating well inside the metal tubing down a column of hollow metal rods, which in prize-flow area set submersible pump for pumping fluid. In the process ekspluatacijnadil to obtain information about the status of the prize-flow zone, for example, using electromagnetic communication channel. To do this, on the surface by using a constant current source, connected to one contact (clip) to ground the metal parts of the column, which may be a column of hollow metal rods, and another contact (clip) - to the receiving electrode on the mouth, which use a different metal pipe, such as tubing, into the well serves a constant current, stable value, which, passing through the metal column (the column of hollow metal rods), separated by a dielectric insert, generates an electromagnetic field that creates a potential difference between the metal casing and isolated part of it.

To send the message from downhole electromagnetic channel close or unlock (commute) key lower and upper metal columns, changing the effective value of the conductivity between the receiving electrode (the other of the metal column) of the constant current source and a metal column with a dielectric insert. With the closure of the key specified effective conductivity increases, and the voltage at the terminals of the constant current source falls and is registered by the registration unit, for example, a differential voltmeter. The change in the measured voltage is judged on PA is amerah drilled formation. Duration and sequence of closures of the key is determined by the encryption module downhole unit of measurement (Fig. not shown due to being well-known). Thus, the useful signal is the change in the voltage at the terminals of the current source that maintains a constant (stable) current, which is determined by the conditions of transfer - conductive layer. Metal column rods and metal column tubing in the upper part electrically separated.

The implementation of the method can be carried out is presented by the device.

The device includes a constant current source 1 is connected to one contact 2 to ground the metal casing of hollow rods (steel columns) 3, and the other contact to the receiving electrode 4 metal tubing 5 (other metal column), in which concentric set column metal hollow rods 3. Between these contacts set to block registration of the change of voltage, for example, differential voltmeter 6. Metal column 3 in the well are separated by a dielectric insert 7 on the upper part and lower part, which are closed/opened by a key 8. In the critical zone of the metal column 3 attached to the submerged pump 9 for pumping fluid. At the wellhead metal columns is 3 and the tubing 5 are separated by a seal 10 of a dielectric material. POS. 11 - scratcher-centralizer of dielectric material. The dotted line shows the generated electrical circuit.

Ground the generator 1 produces a constant regulated amount of current that is passing through the metal column 3, separated by a dielectric insert 7, generates an electromagnetic field that creates a potential difference between the metal casing 3 and isolated its upper part.

With the closure of the key 8 effective conductivity increases and the voltage source constant current (ground generator) 1 falls, which is registered by the differential voltmeter 6, connected to the contacts 2 and 4 of the specified power source. However, changing the potential difference is modulated appropriately coded signal (information). Because at the wellhead installed gasket 10 of a dielectric material, and the hole in the upper part of the metal columns placed scratcher-centralizer 11 (may be a few pieces) of dielectric material, the metal column rod 3 and the metal column tubing 5 are electrically separated, in addition, between the specified columns in the well is produced fluid, the conductivity of which is very small.

1. The method of transmitting information by electromagnetic communication channel during well operation including the speaker excitation electric current in a metal casing in a well using ground-based generator, connected with one contact to ground the metal parts of the column and the other contact to the receiving electrode on the surface of the well, switching the dielectric insert that separates the metal column in the well on the upper and lower parts, and obtaining information from the borehole bottom, depending on the ripple caused by the switching of the dielectric insert, characterized in that the receiving electrode use a different column of metal pipes, lowered into the well, and create the electric circuit metal columns and the receiving electrode, which is passed stabilized constant current from the ground of the generator, while obtaining information from the borehole bottom exercise, depending on the modulation voltage required to stabilize the DC ground of the generator (source of stabilized voltage) when the change in the effective value of the resistance of steel columns, caused by the switching of the dielectric insert.

2. The method of transmitting information by electromagnetic communication channel during operation of the well according to claim 1, characterized in that the receiving electrode using metal tubing pipe (tubing), which is concentric with a metal column with a dielectric insert.

3. Device for transmitting information by electromagnetic communication channel during operation of the wells containing ground the generator is connected with one contact to ground the metal parts of the column and the other contact to the receiving electrode on the surface of the borehole, dielectric insert that separates the metal column in the well on the upper and lower parts, the key to opening and closing of the contacts of the upper and lower parts of the metal columns, characterized in that the receiving electrode made in the form of the other columns of metal pipes, lowered into the borehole, the specified column in the upper part are electrically isolated from each other, and as the ground of the generator used source stabilized DC and between the said contacts has a recording unit changes the voltage of this current.

4. Device for transmitting information by electromagnetic communication channel during operation of the well according to claim 3, characterized in that the receiving electrode used metal tubing, which is concentric with a metal column with a dielectric insert, the columns in the upper part are electrically isolated from each other.



 

Same patents:

FIELD: mining.

SUBSTANCE: retaining device (13) inserted into a central channel of a drilling string component. The channel has the first diameter on at least a part of the central section of the drilling string component, and the second diameter near the ends of the drilling string component. The second diameter is less than the first diameter. The retaining device (13) comprises a lengthy body (14), forming at least partially a jacket for a transfer line. The lengthy body (14) has transverse dimensions less than the second diameter. Multiple arc elements (15) are arranged along the lengthy body (14). Arc elements are separate from the lengthy body and are attached to it.

EFFECT: arc elements are elastically bending for provision of their displacement through the second diameter and have the largest chord that is more than the first diameter in free condition for creation of an opportunity of expansion in the first diameter after stretching via the second diameter.

3 cl, 9 dwg

FIELD: physics.

SUBSTANCE: electrodes are separately exposed to the impact of periodically accumulated potential energy of a spring, which is generated by rotating screw pairs and abrupt (impact) release of energy when screw interaction of crests of the screw pairs ceases. The apparatus for realising the method is a drive structure having an output shaft which actuates the screw pairs. During forward rotation, the screw pairs open centralisers and elastically press the electric leads to the wall of the well casing, apply periodic action on the electrodes that are rigidly connected to the electric leads. The electric leads are cut into the wall of the well casing. Impact action occurs when screw interaction between the screw and nut, which is pressed by a power spring, ceases.

EFFECT: improved electrical contact between electric leads and a casing column.

10 cl, 4 dwg

FIELD: physics.

SUBSTANCE: disclosed is a seal assembly for an electrical logging probe, having a cylindrical housing, a plurality of dielectric inserts placed in the housing, a plurality of annular electrodes coaxially placed in the housing between the dielectric inserts and touching the end faces of the dielectric inserts with their end faces, an insulating means placed on the cylindrical housing for electrical insulation of the plurality of annular electrodes from the housing. According to the invention, each of the plurality of annular electrodes and dielectric inserts in contact with the annular electrodes have bevel end faces. The bevel end faces of the electrodes are interfaced with the bevel end faces of the dielectric inserts that are in contact with them. The seal assembly has a means of generating a compression force and fixing, which is in contact with the end face of the dielectric insert, placed distally with respect to said dielectric insert which is in contact with the cylindrical housing.

EFFECT: high containment of electric equipment of the probe from the external medium of the well and improved probing data.

12 cl, 5 dwg

FIELD: radio engineering, communication.

SUBSTANCE: disclosed is a method of transmitting measurement data by a cable-free telemetric system when drilling wells, involving encoding and transmitting information via a phase-shift keyed signal in form of a sequence of pulses, synchronising the signal and receiving the encoded information by a land receiver. One-time (initial) phase synchronisation of precision quartz-crystal oscillators of the transmitter of the bottom telemetric system and the land receiver is carried out by accumulating data on the transitioning of the signal through zero and one-time synchronisation of signals using a priori information on the bottom telemetric system at the current moment in time is also carried out. Prolonged stability of synchronisation of said oscillators is ensured by adjusting the phase of the quartz-crystal oscillator of the land receiver relative to the statistically determined transitioning through zero of the signal of the transmitter of the bottom telemetric system.

EFFECT: higher capacity of the communication channel and high noise-immunity thereof.

1 dwg

FIELD: oil and gas industry.

SUBSTANCE: system includes flexible tubing having a fibre optic conductor and a section with instruments. At that, fibre optic conductor is located in a cavity flush with outer surface of the section of flexible tubing equipped with instruments. Besides, the above cavity is curved. The system also includes a device for fixing the fibre optic conductor on the surface of the wall of flexible tubing, an adapter through which the above conductor passes to an internal fibre optic conductor, and a connecting coupling. The latter has the possibility of data transferring by means of contactless telemetry.

EFFECT: improving measurement efficiency of one or more parameters in the well along a certain zone of the well.

21 cl, 9 dwg

FIELD: electricity.

SUBSTANCE: method to transfer information from a well consists in the following: using a surface generator, electrical current is excited in a string of metal pipes, which generates electromagnetic field spreading in the rock of the well, which reaches the bottomhole area and creates the difference of potentials between the metal string and its isolated part. Receipt of information from the bottomhole is carried out depending on modulation of the voltage value required for stabilisation of the surface generator DC. The surface generator is a source of a stabilised DC. Besides, the surface generator is connected with one clamp to a surface part of the pipe string, and by the other one - to a grounded electrode that is remote from the well head. At the same time for transfer of information from the bottomhole the lower and upper parts of the string are closed or opened, changing the efficient value of conductivity between the grounding electrode of the current source and the metal string. When the key is closed, the specified efficient conductivity increases, and voltage on the current source clamps reduces and is recorded by a recording unit. By variation of the measured voltage the parameters of the drilled bed are decided.

EFFECT: increased reliability of information transfer from a bottomhole and expansion of its application area.

2 cl, 1 dwg

FIELD: measurement equipment.

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EFFECT: increasing informativity of transferred parameters owing to increasing transfer frequency of logging parameters of gamma background and formation resistance.

4 cl

FIELD: oil and gas industry.

SUBSTANCE: method for determining the saturation of reservoir beds involves determination of porosity coefficient of the investigated formation using two-probe neutron-neutron logging as per thermal neutrons. Calculation of porosity function as the ratio of intensities of flows of thermal neutrons. Recording of GIRZ spectrum intensities. Measurements are carried out during cement setting period of time after 2-4 days from the beginning of cementing of the well shaft, or 2-4 hours after the drilling tool has been raised out of the well. There are cross-plots as per dependences. On cross-plots there performed is approximation of lower points of quadratic function, which correspond to water-bearing formations with drill mud filtrate, and the function reflecting "deficiency of density and hydrogen content" in the nearest zone is calculated as per the given formula.

EFFECT: enlarging the range of application; improving its accuracy and informativity.

4 dwg, 2 cl

FIELD: oil and gas industry.

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8 cl, 6 dwg

FIELD: oil and gas industry.

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2 cl, 1 dwg

FIELD: well drilling technologies.

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1 dwg, 1 ex

FIELD: oil producing industry; pumping facilities.

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2 cl, 1 dwg

FIELD: oil producing industry; pumping facilities.

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2 cl, 1 dwg

FIELD: oil producing industry; pumping facilities.

SUBSTANCE: according to proposed method jet pump with stepped through channel in its housing and packer with through channel and complex logging device are lowered into well on tubing string. Logging device is installed under packer on tubing string. Perforated section is made on tubing string from side of its lower end. In process of lowering, using logging device, background values of physical parameters of producing formations are recorded, and then packer is released. Packer is installed higher than producing formations under surveying, and complex logging device is installed in zone of producing formations. Then depression insert is installed in stepped through channel of jet pump housing to separate tubing string, and working liquid medium is fed into nozzle of jet pump, thus building different value depressions in underpacker space of well. At each value of depression, well production rate is measured and then, with jet pump operating, complex logging device is moved along producing formations by displacing tubing string without depacking of packer and geophysical parameters of producing formations are recorded. After completion of surveying, depacking of packer and lifting of tubing string with jet pump and logging device to surface is done.

EFFECT: provision of intensification of surveying, testing and preparation of wells, mainly, horizontal and highly slanted wells, optimization of functions of packer and improved reliability of jet plant.

1 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: 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 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: 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: 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 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

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