Methods, device and systems for receiving of information about geological formation by means of sensors, installed on casing pipe in borehole

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil-producing industry and provided for receiving the information about geological formation, about casing pipe or about fluid in casing pipe. For this there are used requester and one or more sensing device in borehole. Requester is located in borehole, and it is usually implemented with ability of movement inside the borehole. Sensing device, which is fix installed in cut in casing pipe hole, allows body and vessel with corresponding electronics. Body of the sensing device is usually implemented with the ability of provision of hydraulic gate relative to hole in casing pipe. Requester and sensing device implement communication to each other by wireless method.

EFFECT: providing of on-line monitoring of cased boreholes parametres with simultaneous simplification of measurements.

36 cl, 9 dwg

 

The technical field to which the invention relates.

The present invention relates to a method, device and system for obtaining information about the geological formation or wellbore passing through the geological formation. The invention in particular relates to a method, device and system for exchange of information and power between the downhole device-interrogator in the cased well and the sensors mounted on the casing pipe.

Prior art

Oil and natural gas from geological formations is usually done by drilling through subterranean formations to gain access to the containing hydrocarbon zones and the subsequent application of methods of production to deliver hydrocarbons to the surface by drilled wells. To prevent collapse of the wells they are often equipped with a steel pipe, called casing or liner and case hardening to the borehole wall. After installation of the casing and the shank preclude direct access to information and therefore interfere with the measurement of the important properties of the formation, such as the pressure and the resistivity of the fluid, or exclude the possibility of such measurement. For this reason, logging boreholes is usually performed prior to the on-site installation of the casing string.

To storyoftheyear operation of the reservoir, it is desirable to continuously monitor the temperature, pressure and other parameters of the geological formations at different depths of the wells on a regular basis for most of the time the life of the well. Valuable information about the integrity of the wellbore can be obtained by continuous monitoring of parameters such as the angle of inclination of the borehole and the thickness of the casing. The usual way of such monitoring is to install sensors on the outside of the casing, the interconnection of sensors on the wire to provide telemetry and electricity from the surface of the geological formation and cementation of sensors and wires in place. This type of system is described in U.S. patent No. 6378610, Rayssiguier, etc. This system has many obvious drawbacks, such as complexity of the installation of the casing pipe and the impossibility of replacing failed components. Another monitoring system disclosed in the patent application U.S. No. 2001/0035288, Brockman and others, which discloses a means for the exchange of information and power on the wall of the casing through an inductive link elements. But for these items requires significant modification of the casing, and cannot be set on the spot. According to U.S. patent No. 6070662, Ciglenec and others, disclosed a means for communication with the sensor installation is in certain geological formations, but for this technical solution requires that the sensor was installed on site prior to the installation of casing pipe. U.S. patent No. 6443228, Aronstam and others, describes a means of exchanging information and energy between devices in fluid wells and devices installed in the wall of the wellbore, but this solution does not take into account problems due to the presence of casing or liner.

The invention

Thus, the objective of the invention is to provide devices, methods and systems for obtaining information about the geological formation or pass through the wellbore.

Another objective of the present invention is to provide methods, devices and systems for exchange of information and energy between the requester in the cased well and the sensors mounted on the casing pipe.

Another objective of the present invention is to provide methods, devices and systems for transmission of information between the requester in the hole and the sensor mounted on the casing pipe with wires and without significant changes of the casing.

According to the objectives of the invention are provided by a requester and a transmitter. Primary Converter (which is either mounted on the outer surface of the casing or HVO is Tulika prior to the installation of casing in the borehole, or is inserted into an open slot in the casing pipe after cementing the casing in place) includes a housing and a sensor with associated electronics. The requester is inside (and is arranged to move inside the wellbore. According to one of embodiments of the requester, in fact, is a toroidal transformer having an elongated conductive body, surrounded by a core of a material with high magnetic permeability and having a winding. Primary Converter installed and fixed in the hole cut in the casing pipe, includes a housing, a sensor with associated electronics and the electrode. The electrode is insulated from the casing insulator, and the body of the transducer is preferably arranged to provide hydraulic valve against the opening in the casing pipe.

Alternating current circulating in the winding of a toroidal transformer that induces magnetic flux in the transformer core, causing the voltage difference generated at opposite ends of the conductive body. In turn, the voltage difference causes a current to flow at least in outline, composed of a conductive body of the transformer, the downhole fluid, the primary Preobrazovatel and casing pipe. The current taken by the electrode, it is possible to straighten the inside of the transducer, to provide energy for electronic circuits and sensor. By modulating the current circulating in the winding of the transformer of the requester, it is possible to transmit information from the transformer to the primary Converter that selects and demodulates the signal. Similarly, a transmitter can send information to the interrogator by modulating the difference between the voltages supplied between the electrode of the transducer and the casing pipe. The current induced in the winding of the requester, you can analyze to determine the transmitted information.

According to another variant implementation of the primary Converter and the requester among themselves have a magnetic coupling, which is valid when the primary Converter and the requester is installed near each other. Magnetic connection is preferably implemented at least one solenoid winding to the requestor (the main axis is essentially parallel to the axis of the wellbore and at least one solenoid winding for the primary Converter (major axis which is essentially parallel to the axis of the wellbore), so as to provide between them an interconnect in the form of a weak transformer connection. The requester and transducer done is make wireless connection with one another by magnetic coupling.

According to one preferred variant implementation of the present invention, when the requester is located directly near the primary Converter, the AC current circulating in the winding of the requester and creates a magnetic flux in the local section of the wellbore adjacent to the requester and the primary Converter. Part of this flow is removed the coil of the sensor, causing the flow of current through the coil of the sensor. The current flowing through the coil of the sensor produces a voltage signal at full load resistance. By modulating the current circulating in the winding of the requester, the information can be sent from the requester to the device sensor. Similarly, by modulating the impedance of the load winding device-sensor (or by modulation of the current circulating in the primary winding of the Converter) can be sent from the device-sensor to the interrogator.

The system according to the present invention preferably contains a variety of transducers located along the length of the casing, and at least one interrogator, which can also be moved in the wellbore. The method according to the present invention preferably includes the steps of determining the location of many transducers along the length of the casing is, move the requester on the casing pipe and the interrogator to transmit a signal to the transducer, and the primary Converter to obtain information about the geological formation and wirelessly transmit this information to the requester.

Other objectives and advantages of the present invention will be obvious to experts in the art from the following detailed description in conjunction with the accompanying drawings.

List of drawings

Figure 1 - schematic diagram of a variant of implementation of the system of the present invention in a wellbore in a geological formation.

Figure 2 - schematic diagram, in partial cross section, of a variant of implementation of the system according to the present invention, also illustrating the flow of electric current in the requester - in query mode and in the primary Converter in the receive mode.

Figure 3 shows the figure 2 schematic diagram, in partial cross section, of a variant of implementation of the system according to the present invention, also illustrating the flow of a current when a transmitter is in the transmit mode, and the requester is in receive mode.

4 is a schematic diagram, in partial cross section, of another version of the implementation of the primary Converter according to the present invention.

F. g - schematic diagram, in partial cross section, of another version of the exercise system according to the invention, also illustrating the magnetic flux generated by the requester at the time of data transmission from the interrogator to the primary Converter.

6 is a schematic diagram, in partial cross-section, shown in Figure 5 variants of the implementation of the system, also illustrating the magnetic flux generated by the primary transmitter when transmitting information from the primary Converter to the requester.

7 is a schematic diagram, in partial cross-section, shown in Figure 5 variants of the implementation of the system, also to illustrate as an example, the hydraulic isolation of well fluids from the sensor(s) and related electronic circuitry of the primary Converter and hydraulic isolation of well fluids from geological formations).

Fig - schematic diagram, in partial cross section, of another version of the implementation of the primary Converter according to the invention.

Fig.9 is a schematic diagram of another alternative implementation of the system according to the invention.

A detailed description of the preferred embodiments

Figure 1 shows a schematic representation of a typical Nefedov the living installation. The rig 10 is shown on the geological formation 11. Through geologic formation passes the wellbore 13, at least part of which passes casing pipe 12. Casing 12 includes a fluid 16, which may contain, for example, drilling mud or wireline fluid(s). From the tower 10 or from a winch (not shown) in the casing passes downhole device 18.

One of the embodiments of the system 20 according to the invention Figure 1 contains the requesting device or the interrogator 23 associated with the downhole device 18 or any part thereof, and a transmitter 27. According to this variant implementation, the requester 23 is arranged to move inside the casing 12 of the well bore, the primary Converter 27 is usually attached to the casing pipe 12, as below described. According to the invention the system of the invention 20 includes at least one interrogator 23 and at least one transducer 27. In some embodiments, the implementation of the system of the invention 20 includes at least one interrogator 23 and several transducers 27 located along the length of the casing.

According to Figure 2 and 3, in some embodiments, the implementation of the present invention, the interrogator 23, in essence, is a toroidal transformer, containing elongated wire is coming from the body (terminal or pipe) 33, surrounded by core material 34 having a high magnetic permeability, which is made conductive winding 35. The magnetic core 34 may be installed in a groove (not shown)performed on the conductive body 33, and is enclosed in insulating material for mechanical and chemical protection. The winding 35 is preferably isolated from the conductive body 33. The interrogator 23 is preferably in the form of a downhole device is moved along the traveling rope, lifting strap or flexible pipe. Elongated conductive body 33 typically has a length of from one to several feet and can, if necessary, be longer or shorter. Alternatively, the requester may be embedded in the drill pipe, drill collar, operational tubing string or other permanently or temporarily installed component of the finished hole. The interrogator 23 preferably is made with the possibility of messages with ground equipment (not shown) via any of a variety of telemetry schemes known from the prior art, and can be applied electrical conductors, optical fibers, pressure pulses in the mud column or other means to carry out the message. Alternatively, the interrogator 23 may include a storage device, such as Locke is the emotional memory device (not shown) for storing data, obtained from the sensors. The contents of the storage device can be unloaded when the interrogator 23 will be returned to the surface geological formations 11.

According to Figure 2 variant implementation of the primary Converter 27 of the present invention shown installed and fixed in the hole 41 cut in the casing pipe 12, and comprising a housing 47, one or more sensors 48 (one shown) with appropriate electronic circuits 49 and one or more electrodes 50 (one shown). The housing 47 may be the site of several parts from the same or different material, including, without limitation, metals, ceramics and elastomers. Depending on the type of sensor(s) 48, part of the primary Converter 27, the housing 47 may have one or more holes (not shown)through which the geological formation or borehole fluids may come in contact with the sensor(s) 48. The electrode 50 is isolated from the casing insulator 51, which may be an integral part of the transducer 27. The housing 47, the electrode 50 and the insulator 51 of the transducer 27 is preferably configured to provide hydraulic valve with respect to the hole 41 in the casing pipe 12. The electrode 50 and the insulator 51 is preferably flush with the inner surface of the casing 12 is provided for the I smooth movement of equipment in the wellbore.

The sensor 48 and the electronic circuit 49 is preferably perform multiple functions. In particular, each sensor 48 is preferably registers one or more properties of the geological formation 10 surrounding the casing (for example, pressure, temperature, resistivity, components of fluid, properties of fluid and other), or one or more properties of the casing 12 (e.g., slope, stress etc). This registration properties may be continuous, carried out at predefined points in time or only on command of the interrogator 23. If the registration of properties is carried out in continuous or predetermined points, the transducer 27 may store the received information in a storage device (which may be part of the respective electronic circuits 49) before receipt by him of a request from the requester. Admission to query the electronic circuit 49 sensor 48 is preferably transmit by electronic means (electrode 50) information received by the sensor 48, the interrogator 23 according to the below description. Transducer 27 may wish to have special code for unique identification to the requestor 23.

According to one aspect of the present invention in certain embodiments of the implementation of the interrogator 23 or contains a means of generating Eremenko the current in the winding 35, or connected with the alternator. When circulating alternating current in the winding 35 toroidal transformer magnetic flux induced in the magnetic core 34, resulting in opposite ends creates a voltage difference (i.e. above and below the core 34) conductive body 33. The voltage difference, in turn, causes the flow of electric current, and, according to Figure 2, creates three categories of the current paths. The first circuit includes a conductive body 33 and conductive fluid 16 within the casing 12, which carries the current back to the conducting body 33. The second circuit includes a conductive body 33, the conductive fluid 16 within the casing 12 and the casing 12. In the second circuit, the current is returned to the conducting body 33 in the fluid 16. The third circuit, for the main invention is a circuit which includes the conductive body of the transformer 33, the fluid 16 and the electrode 50 of the transducer 27. By modulating the current circulating in the winding 35 of the transformer of the interrogator 23, under any scheme, well-known specialists in the field of technology, information can be transmitted from the interrogator 23 in primary Converter 27, which removes and demodulates the signal. The route returns for the current taken by the electrode 50, passes either from the primary Converter 27 through g the ideological formation 11, the casing 12 and the fluid 16 and back into the conducting body 33, and/or through special grounding conductor (not shown) of electronic circuits 49 in the housing 47, the casing 12 and the fluid 16 back in the conductive body 33.

According to one aspect of certain embodiments of the present invention, the current taken by the electrode 50, it is possible to straighten electronic circuit 49 to provide power for electronic circuits 49 and sensor(s) 48. If the current taken by the electrode 50, too weak to zapisywania electronic circuits 49 and sensor(s) 48 directly, the current can accumulate during the relevant period in the component of energy storage, such as a capacitor, or verhandeling, or a rechargeable battery. Electronic circuit 49 can be actuated to operate when the accumulated charge is sufficient for them to work correctly.

According to another aspect of these embodiments of the present invention the sensing device 27 can transmit information to the interrogator 23 by modulating, by any of many known methods, the difference of voltage (generated electronic circuits 49), which is attached to the primary Converter 27 between the electrode 50 of the transducer 27 and the casing pipe 12. Formed in this category the current Contura is shown in Figure 3: the first circuit, containing the electrode 50, the fluid 16, siege tube 12, and back to the primary Converter 27 (through the housing 47 and other); and a second circuit containing the electrode 50, the fluid 16, the conductive body 33 of the requester, and back through the fluid 16, the casing 12 and the sensing device 27. The current, which is in the conductive body 33, causes the magnetic flux in the magnetic core 34, which, in turn, induces a current in the winding 35 of the interrogator 23. The current in the winding, you can record and analyze in order to determine the transmitted information.

Specialists in the art it should be clear that in the presence of a primary Converter 27 that is installed in the casing pipe 12 and having electrode 50, insulated with respect to the casing tube, in the presence of the above-described interrogator 23, when the magnetic core 34 of the requester directly facing the electrode 50, the signal generated by the primary Converter 27, will not be detected by the interrogator 23, i.e. the function of the telemetry transmission is to show a simple zero. Thus, the primary Converter 27 can be used as a marker in order to determine or identify the desired location along the well as the location of the primary transmitter can be determined very accurately by moving the interrogator 27 by the primary Converter 25 and p is the power of fixing the location of the signal strict zero, followed by a treatment phase.

Figure 4 shows a second variant implementation of the primary Converter 137 of the invention. Primary Converter 137 includes a housing 147, two sensor a, 148b, electronic circuit 149, the electrode insulator 150 and 151 to isolate the electrode relative to the casing 12 and to provide water seal between the casing pipe 12 and the inner space of the primary Converter 137. As shown in figure 4, the casing 147 primary Converter 137 is mounted on the outer surface of the casing 12, and the electrode insulator 150 and 151 are made flush with the inner surface of the casing 12. With this geometry it should be noted that the primary Converter 137 is preferably mounted on the casing pipe 12 prior to the installation of casing in the wellbore. It should also be noted that the primary Converter 137 can function similarly to the primary Converter 27 shown in figure 2 and 3.

In some embodiments, the implementation of the system according to the invention preferably contains a variety of transducers 27 or 137 and at least one interrogator 23. The sensing device may be located along the length of the casing 12 and/or in different azimuths of the casing. The requester preferably moves along the wellbore.

According to the alternative implementation of the present invention, in accordance with Figure 5 and 6, the requester 223 includes an elongated body (rod or pipe) 233, on which rests a conductive winding 234. The main axis of the winding 234 is preferably oriented parallel to the axis of the wellbore and according to the illustration. If, for reasons of mechanical strength or for other reasons the body 233 is made of such conductive materials such as metals, the magnetic flux generated by the winding 234 (below according to the following more detailed description), which may cause the flow (circulation) eddy currents in the body 233. These eddy currents that dissipate energy and do not contribute to the operation in accordance with the present invention, preferably reduced by introducing a sleeve 235 from a material of high magnetic permeability (such as ferrite), which is installed between the winding 234 and body 233, as illustrated. Winding 234 is preferably isolated from the body 233. The requester 223 may be made in the form of the downhole device is moved along the traveling rope, lifting strap or flexible pipe. Elongated conductive body 233 typically has a length of from one to several feet, and may, if necessary, be longer or shorter. Alternatively, the requester 223 may be embedded in the drill pipe, the drill collar, in production tubing string or other permanently or temporarily installed component of the finished hole. In any case, the requester 223 may be configured to implement message with ground equipment (not shown) via any of a variety of telemetry schemes known from the prior art, and can be applied electrical conductors, optical fibers, pressure pulses in the mud column or other means to carry out the message. Alternatively, the requester 223 may include a storage device, such as a local storage device (not shown) for storing data received from the sensors. The contents of the storage device can be unloaded when the requester 223 is returned to the surface geological formations 10.

Primary Converter 227 of this variant embodiment of the invention shown installed in the hole 241, cut in the casing pipe 12, and includes a housing 247, one or more sensors 248 (not shown) with corresponding electronic circuit 249 and winding 250 of several turns of insulated wire 251, wound around a cylindrical body 252 (such as a bobbin, according to the illustration) of a material of high magnetic permeability (such as ferrite). Winding 250 of the sensor 248 prepact the positive set, to the extent possible, on the same level with the inner surface of the casing 12, and its major axis is oriented parallel to the axis of the well bore as illustrated. Case 247 may be configured as a host of several parts made from the same or different material, including, without limitation, metals, ceramics or elastomers. Depending on the type of sensor(s) sensor(s) 248 included in the primary Converter 227, case 247 may have one or more holes (not shown)through which the geological formation or borehole fluids may come in contact with the sensor(s) 248. Primary Converter 227 is preferably does not pass inside the wellbore and therefore allows for easy movement of equipment in the wellbore.

Sensor 248 and the electronic circuit 249 is preferably perform multiple functions. In particular, each sensor 248 is preferably registers one or more properties of the formation around 10 of the casing (for example, pressure, temperature, resistivity, components of fluid, properties of fluid and other) and/or one or more properties of the casing (e.g., slope, stress etc). This registration properties may be continuous, carried out at predefined points in time or only on command of the interrogator 23. If the registration of properties is carried out in continuous or predetermined points, the primary Converter 227 may store received information in a storage device (which may be part of the respective electronic circuits 249) before receipt by him of a request from the requester 223. If requested, the electronic circuit 249 sensor 248 is preferably passed (on the winding 250 of the sensor information obtained by the sensor 248, the requester 223, according to the below description. Primary Converter 227 may wish to have special code for unique identification to the requestor 223.

According to one aspect of this variant embodiment of the invention, the requester 223 or contains means for modulating the current in its winding 234, or connected with the generator, a modulating current. By modulating the current in the winding 234 of the requester according to the data signal (which comes from a requester 233 in primary Converter 227) magnetic flux circulates in the contours in the local section of the wellbore adjacent to the requester 223, which is shown schematically in figure 5. When the requester 223 is in this local area, then circulating the magnetic flux generated by the winding 234 of the requester, induces a modulation of the current in the winding 250 of the sensor. Essentially, the winding 234 of the requester and the winding 250 is Attica form a transformer weak links. Modulating the current in the winding 250 of the sensor induces a modulated voltage signal at the associated full resistance 253 load. Electronic circuit 249 demodulator modulated voltage signal to recover the data signal. It should be noted that any of the many schemes of modulation and corresponding demodulation) current, known from the prior art, can be used to transmit information in the data signal, transmitted from the interrogator 223 in primary Converter 227. In a preferred version of this alternative implementation of the present invention, the information is modulated onto the carrier signal, and thus the current in the winding of the requester needs to oscillations at a frequency of about 100 kHz.

According to one aspect of the present invention, the current generated in the winding 250 of the sensor, it is possible to straighten electronic circuit 249 to provide power for electronic circuits 249 and sensor(s) 248. If the current generated in the winding 250 of the sensor is too weak for zapisywania electronic circuits 249 and sensor(s) 248 directly, the current can accumulate during the relevant period in the component of energy storage, such as a capacitor or verhandeling, or a rechargeable battery. Electronic circuit 49 can be actuated to operate when the accumulated C is a number sufficient for them to work correctly.

According to another aspect of the present invention the sensing device 227 may send information to the requester 223 by controlling the electronic switch 254 is connected to the winding 250 of the sensor, according to Figure 5. With the closure of the switch 254 current induced in the winding 250, circulates freely; this current makes a magnetic field that compensates for (or significantly reduces) creating a disturbance magnetic field near the reel 252. This perturbation in creating the disturbance magnetic field that occurs in the local section of the wellbore near the primary Converter 227, induces a small modulation current signal in the winding 234 of the requester 223. Modulation of the current in the winding 234 induces a modulated voltage signal at the interrogator 223. When open the switch 254 winding 250 of the primary Converter 227 does not generate compensating magnetic field and therefore does not induce a small modulation current signal in the winding 234 of the requester 223 and the corresponding modulated voltage signal at the interrogator 223. Thus, through selective activation and deactivation of the switch 254 in coded sequence (in accordance with the data signal), and by demodulation of the signal voltage induced in the small modulation current signal in the winding 234 bytes is scica, to recover the information signal data, information, encoded signal data is transmitted from the primary Converter 227 in the requester 223.

In alternative versions of this variant implementation, according to Fig.6, the primary Converter 227' can transmit the information to the requester 223 due to the fact that the electronic circuit 249 contain a means of introducing a modulating current in the winding 250 of the sensor. By modulating the current in the winding 250 of the sensor in accordance with the data signal (which is transmitted from the primary Converter 227' in the requester 223) magnetic flux circulates in the contours in the local segment of the borehole, which is located near the primary Converter 227', which is schematically shown in Fig.6. If the requester 223 installed in this local area, then circulating the magnetic flux generated by the winding 250 of the sensor induces a modulation of the current in the winding 234 of the requester. Winding 250 of the sensor and winding 234 of the requester, in essence, form a loosely coupled transformer. Modulating the current in the winding 250 requester induces a modulated voltage signal at the associated full resistance (not shown) of the load. The requester 223 demodulates a modulated voltage signal to recover the data signal. It should be noted that any of the many modulation schemes (and the line is adequate demodulation) current known from the prior art, can be used to transmit information in the data signal, transmitted from the primary Converter 227/227' in the interrogator 23. In a preferred version of this alternative implementation of the present invention, the information is modulated onto the carrier signal, and thus the current in the winding of the requester needs to oscillations at a frequency of about 100 kHz.

Specialists in the art it will be clear that the configuration of the winding 234 and/or winding 250, and the corresponding amplitude and phase of the currents injected into the windings, can be adjusted to compensate (or gain) of the magnetic field at specific locations of the wellbore. For example, the requester 223 may have a pair of windings, separated from each other by their common main axis by a small gap. In this configuration, two windings can be excited by counter currents (e.g., currents that flow in opposite directions around a common main axis), creating a simple zero of the function of the telemetry transmission when the specified gap combined (for example, directly facing) with winding 250 of the primary Converter 227 (or 227'). Thus, the primary Converter 227 can be used as a marker in order to determine or identify the desired location along the well as the location of the primary change is the appropriate fields can be determined very accurately by moving the requester 223 by the primary Converter 227 and by fixing the location of the signal strict zero, followed by a treatment phase.

According to Fig.7, the body 252 and the winding 250 of the sensor is preferably placed in the material 256, which provides the hydraulic prevent leakage of well fluid into the cavity, limited housing 247, which is the impedance 253 load in addition to the sensor(s) 248 and associated electronic circuits 249 (and also eliminates through the fluid communication between the formation and the wellbore in the case, if the case 247 through the fluid communicates with the geological formation according to this description). If the sealing material 256 is conductive, the body 252 and the winding 250 of the sensor is electrically isolated from the sealing material 256 with insulator 258, as illustrated. In addition, preferably provided with a cover 259, which protects the winding 250 of the sensor in the borehole fluid (and other downhole devices). In alternative implementation, in which the sensor(s) 248 is configured to register the characteristics of the downhole fluid, the sealing material 256 may be configured to (or excluded) to provide communication through the fluid between the well bore and the cavity, limited housing 247 sensor, which is appropriate sensor(I.

On Fig shows another variant implementation of the primary Converter 327 according to the invention. Primary Converter 327 includes a housing 347, two sensor 348a, 348b, electronic circuits 349 and winding 350, containing a few turns of insulated wire 351, wound around a cylindrical body 352 (such as a bobbin, according to the illustration) of a material of high magnetic permeability (such as ferrite). According Pig case 347 primary Converter 327 is installed on the outer surface of the casing 12, and the winding 350 of the sensor is preferably installed as possible, on the same level with the inner surface of the casing 12, and its major axis is oriented parallel to the axis of the wellbore. With this geometry it should be noted that the sensing device 327 is preferably mounted on the casing pipe 12 prior to the installation of casing in the wellbore. It should also be noted that the primary Converter 327 can function similarly to the primary Converter 227 and 227', shown in Figure 5 and 6.

The system according to the present invention may include multiple primary converters 227 (227') or 327 and at least one requester 223. The sensing device may be located along the length of the casing 12 and/or in different azimuths of casing is. The requester can move around the wellbore.

According to some variants of implementation of the method according to the present invention many transducers are located along the length of the casing, the interrogator moves along the casing pipe, the requester is used to transmit a signal to the transducer, and the transducer receives information about geological formations (either before treatment or after treatment to him) and sends this information to the interrogator wirelessly.

According to another variant of the method of the invention at least one transducer is located along the length of the casing in the desired position along the wellbore, the interrogator moves along the casing pipe, and the change of the wireless signal that is sent to the primary Converter to the requester, is used to accurately determine the desired location in the wellbore. In particular, by moving the requester by the primary Converter and by fixing the location of the signal strict zero, followed by a treatment phase, it is possible to accurately determine the desired location (i.e. the location of the transducer).

Another alternative implementation of the device according to the present izaberete is s shown in Fig.9. According to Figures 9 through geologic formation 11 passes the well bore 13 with the casing 12, passing at least part of the trunk. The requester 423 winding 434 attached to operational tubing string 500. The requester 423 communicates with the surface by one or more connecting cables 502, which zapityvat device and provide telemetry between the device and the surface using electrical or optical means. Primary Converter 427 installed and fixed in the hole cut in the casing pipe 12, and contains a coil 450. Packer 504 is used for hydraulic isolation plots in the casing pipe 12 above and below the packer. Described above, the requester 423 and primary Converter 427 can share power and data. In contrast to other variants of implementation described above, the system corresponding to the present invention, the requester 423 not made easily move inside the casing 12. A significant advantage of this variant implementation compared with the system according to U.S. patent 6378610, Rayssiguier and others, is that the primary Converter 427 can be set in place before installing the operating booster 500 columns (and pinned requester 423), and this system is EMA allows the exchange of power and data between the interrogator 423 and primary Converter 427 without complicated and potentially prone to failure downhole connector type "wet contact". Specialists in the art it will be clear that with one interrogator 423 can relate to a lot of different transducers 427 that one design of the equipment wells can relate to many groups of interrogators and transducers that can be applied many packers 304, especially while completing multiple zones of production, and that these packers can be positioned above or below the interrogators and the primary converters.

In this description described and illustrated embodiments of systems, methods and devices for information about geological formations using sensors mounted in the casing pipe in the well bore. Although specific embodiments of the present invention, any restriction of its two versions of implementation is not expected, since it is implied that the present invention has such a wide scope, to the extent permitted by the prior art, and assumes that the description should be interpreted in this way. Therefore, although the present invention is described with reference to a specific requester and the specific primary converters, you can also use other interrogators and primary converters. For example, the interrogator m which can use many toroids to focus the current flowing in the borehole fluid. In particular, the magnetic cores may be used as electric reactor for limiting the generated current in a specific area(s) of conductive body. Also instead of using a toroidal transformer, you can use a pair of electrodes on the surface of the conductive body to create the voltage difference and the current. Moreover, the requester and/or the sensing device can use a variety of solenoid windings to provide an improved magnetic coupling between them. Also instead of using a solenoid windings it is possible to use any other mechanism of magnetic coupling. In addition, instead of using two winding outputs of the sensor as a differential input in the load impedance of the transducer: one of the conclusions of the windings of the sensor can be grounded and the other output winding of the sensor can be used as a having one end of the sign-in load impedance of the transducer. In relation to the transducers should be noted that it is possible to use various other types of transducers, for example, described in patent application U.S. No. 10/163,784. In addition to the casing and the shank of the primary Converter can mouth the determination in any type of downhole devices for example in a sand filter. In addition to the installation system according to the present invention in the wells of the device containing conductive fluid, the system can also operate in a non-conductive fluid. In the first of the described above embodiments in this case, the frequency of actuation of the system is increased by about a hundred times. Specialists in the art it will be obvious that disclosed in this invention can be made and other modifications within the scope claimed in the attached claims.

1. Primary Converter made with the possibility of its installation in the downhole device located in geological formations, which passes through the downhole device, and this transducer contains
a) a housing in contact with the downhole device;
b) a sensor configured to check a status of at least one of the following: a geological formation, the downhole device and the fluid in the downhole device, and
C) an electronic circuit associated with said sensor and generates a wireless signal related to the definition of the said state, registered the said sensor, these wireless signal presents the magnetic flux in the local area skvazhin the th device close to the said primary transducer, mentioned wireless signal formed with the opportunity to submit information to the requester, which is moved in said downhole device to a location on said local area, and these electronic circuits contain at least one solenoid winding through which flows the modulating current and induces mentioned magnetic flux.

2. Primary Converter according to claim 1, additionally containing
g) an electrode made with the possibility of introducing it into electrical contact with the fluid in the downhole device; and
d) isolation between the said electrode and the said casing;
these downhole device is electrically conductive and said electronic circuit form a wireless signal by inducing a voltage differential between the electrode and the downhole device.

3. Primary Converter according to claim 2, in which the said casing, the said electrode and said insulation provide a seal between the fluid and the formation.

4. Primary Converter according to claim 2, in which the said electrode and said insulation provide a seal between the fluid and the formation.

5. Primary Converter according to claim 2, in which the said body, providing UTY electrode and said insulation is made flush with the surface of the downhole device.

6. Primary Converter according to claim 2, in which the electronic circuit makes the difference variable voltage between the electrode and either the said casing or borehole device.

7. Primary Converter according to claim 2, in which the electronic circuit includes a rectifier, which supplies the electric power to the sensor.

8. Primary Converter according to claim 2, in which the said sensor detects at least one parameter selected from among the following parameters: temperature, pressure, resistivity, components of the fluid and the fluid properties of the geological formations.

9. Primary Converter according to claim 2, additionally containing a second sensor which detects the state of the at least one object from among the following objects: geological formation and downhole device, while the aforementioned second sensor associated with said electronic circuit.

10. Primary Converter according to claim 2, in which the said housing is installed on the outer surface of the downhole device.

11. Primary Converter according to claim 1, in which at least one solenoid winding is made near the inner surface of the downhole device.

12. Primary Converter of claim 1, wherein the downhole device has a longitudinal axis and the main OS is at least one solenoid winding is oriented essentially parallel to the longitudinal axis of the downhole device.

13. Primary Converter of claim 1, wherein the electronic circuit includes the electrical switch connected to at least one solenoid winding, and means to selectively activate and deactivate mentioned electric switch for generating the aforementioned modulation current in order to induce mentioned magnetic flux.

14. Primary Converter according to claim 1, in which the electronic circuits include means for introducing a modulating current in said at least one solenoid coil in order to induce mentioned magnetic flux.

15. Primary Converter of claim 1, wherein the electronic circuit is injected alternating current in said at least one solenoid winding.

16. Primary Converter according to claim 1, in which the mentioned at least one solenoid winding is wound around the body, having high magnetic permeability.

17. Primary Converter according to claim 9, in which the electronic circuit containing a rectifier, which supplies the electric power to the sensor.

18. Primary Converter according to claim 9, in which the said sensor detects at least one parameter selected from among the following parameters temperature, pressure, resistivity, components of the fluid and the properties of the fluid in this geological formation.

19. Primary Converter according to claim 9, further containing a second sensor which detects the state of at least one of the following objects: geological formation and downhole device, while the aforementioned second sensor associated with said electronic circuit.

20. Primary Converter according to claim 9, in which the said body is made with the possibility of installation on an external surface of the downhole device.

21. Primary Converter installed in the downhole device located in geological formations, which passes through the downhole device, and this transducer contains
a) a housing located in the bore of the downhole device and held in the geological formation, the housing is in contact with the downhole device;
b) a sensor configured to check a status of at least one of the following: a geological formation, the downhole device and the fluid in the downhole device, and
C) an electronic circuit located in said housing associated with said sensor forming the wireless signal is related to the definition of the said state, to register the data mentioned by the sensor, these wireless signal presents the magnetic flux in the local section of the downhole device close to the said primary Converter mentioned wireless signal formed with the opportunity to submit information to the requester, which is moved in said downhole device to the location mentioned on the local area.

22. Primary Converter according to item 21, in which the said interrogator includes an elongated conductive body, a core having high magnetic permeability of the material surrounding the part of the above mentioned elongated conductive body, and a conductive winding wound around mentioned having high magnetic permeability material.

23. Primary Converter according to article 22, in which the aforementioned magnetic core attached to the said elongated conducting body.

24. Primary Converter according to item 21, which referred to the primary Converter generates a voltage difference between the electrode and the downhole device.

25. Primary Converter according to paragraph 24, in which
the said interrogator is configured to generate a current signal, forcibly held in the fluid; and
the said electrode is made with the possibility of registration of the above-mentioned current signal.

26. Primary conversions the user according to item 21, in which the said interrogator includes a conductive winding on a slender body.

27. Primary Converter according to p, in which a core having high magnetic permeability material surrounds a part of the above mentioned elongated body and located between the said elongated body and said conductive winding.

28. Primary Converter according to item 27 in which the said core is mounted on said elongated body.

29. Primary Converter according to p, in which the said requester processes the baseband signal current induced in said conductive coil when receiving the aforementioned wireless signals.

30. Primary Converter according to p, in which the said requester generates wireless signals by introducing a modulating signal current in said conductive coil to generate magnetic flux in the local section of the downhole device adjacent to said requester.

31. Primary Converter according to p, in which the downhole device has a longitudinal axis and the main axis of the aforementioned conductive winding is oriented essentially parallel to the longitudinal axis of the downhole device.

32. Primary Converter according to p, optionally containing an electronic circuit for receiving wireless signals transmitted by ENISA least one sensing device to the interrogator, and for processing received wireless signals in order to recover encrypted information.

33. System for information about geological formations, which passes through the downhole device, recorded in geological formations, and this system contains:
(a) a requester who is moving to the downhole device; and
b) at least one transducer mounted in the downhole device and held in the geological formation, and this at least one transducer includes
a) a housing located in the bore of the downhole device and held in the geological formation, the housing is in contact with the downhole device;
b) a sensor configured to check a status of at least one of the following: a geological formation, the downhole device and the fluid in the downhole device, and
C) an electronic circuit located in said housing associated with said sensor forming the first wireless signal is related to the definition of the said state, registered the said sensor, these wireless signal presents the magnetic flux in the local section of the downhole device close to the said primary PR the formers;
these interrogator is configured to receive the aforementioned first wireless signal when it is moved to the location mentioned on the local area.

34. System p, which mentions the interrogator attached to operational tubing column, mounted in said downhole device.

35. The method of determining interest designated in geological formations, which passes through the downhole device, and according to this method:
(a) in of interest location on the downhole device, set the indicator location, with the aforementioned at least one indicator of the location of the housing is in contact with the downhole device, and an electronic circuit made with the possibility of the formation of the wireless signal, represented by the magnetic flux, in the local section of the downhole device, which is adjacent to the aforementioned at least one indicator location;
b) form mentioned wireless signal through the above-mentioned indicator location;
C) move the detecting device through the downhole device and past the above-mentioned indicator location, with the above-mentioned detection device is configured to receive the aforementioned wireless with the persecuted;
g) determine the interest of the place by finding simple zero in the above-mentioned wireless signal.

36. The method of information transfer in geological formations through which the wellbore having a metal downhole device containing within the fluid, and the metal wellbore device also has at least one transducer mounted on the downhole device and held in the geological formation, with the aforementioned at least one transducer has an electrode which is in electrical contact with the fluid, the housing being in electrical contact with the metal wellbore device, the insulation between the electrode and the housing, the sensor registering the state of the at least one object from among the following objects: a geological formation, the downhole device and fluid, and an electronic circuit associated with the sensor and the electrode, according to this method
a) have querier near primary transducer;
b) accept the wireless signal generated by the primary Converter and related to the above condition in the above-mentioned requester; and
C) provide on the surface of the display mentioned wireless signal.
Priority items:

18.12.2003 according to claims 1 to 35;

02.06.2003 on p.



 

Same patents:

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1 dwg

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41 cl, 12 dwg

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7 cl, 5 dwg, 1 ex

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2 cl, 2 dwg

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