A high temperature resistant constant power dual lateral logging tool

Abstract

The invention discloses a high temperature resistant constant power dual lateral logging instrument, comprising an electronic instrument short section and an electrode system short section, wherein the electronic instrument short section comprises a first pressure-bearing outer protective tube and an electronic instrument arranged inside the first pressure-bearing outer protective tube; the electrode system short section comprises a second upper pressure-bearing insulating outer protective tube, a second lower pressure-bearing insulating outer protective tube, a mandrel arranged inside the second upper pressure-bearing insulating outer protective tube and the second lower pressure-bearing insulating outer protective tube, a plurality of electrode rings are sleeved on the mandrel, an insulating sleeve is arranged between adjacent electrode rings, and the plurality of electrode rings and the plurality of insulating sleeves are all positioned between the second upper pressure-bearing insulating outer protective tube and the second lower pressure-bearing insulating outer protective tube; the lower end of the first pressure-bearing insulating outer protective tube is connected to the upper end of the second upper pressure-bearing insulating outer protective tube, and the plurality of electrode rings are all connected to the electronic instrument. The outer diameter of the logging instrument is small, and it can be stored in the drill pipe in advance. After drilling the well, the instrument is pumped out of the center hole of the drill bit through the mud, and the well is logged while the drill pipe is lifted, which effectively improves the logging efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and natural gas detection, and in particular relates to a high-temperature resistant constant-power dual lateral logging instrument. Background Art

[0002] Dual Lateral Logging is a major logging instrument for measuring formation resistivity, studying changes in radial resistivity of formations, calculating oil saturation, and determining the amount of movable oil. It is mainly composed of an electrode system and an electronic circuit. The electrode system of this type of instrument is a double-layer shielding and focusing mode for deep lateral logging, with a detection depth of about 1.3-2.5 meters; the shallow lateral logging is a single-layer shielding and focusing mode, with a detection depth of 0.4-0.8 meters. With the development of oil exploration and development, more and more high-angle wells, small wells, horizontal wells, etc. are being drilled, and the mineralization of drilling mud varies greatly. Conventional dual lateral logging instruments have some inherent problems and can no longer meet the requirements of geologists.

[0003] At present, most of the dual lateral logging instruments used are of the Φ89 series, and there are also a small number of dual lateral logging instruments of the Φ70 series. In recent years, through-drill-pipe dual lateral logging instruments have been introduced, with a minimum instrument outer diameter of Φ56.7mm. This type of dual lateral logging instrument requires the drill bit and drill pipe to be lifted out, and then a special drill pipe equipped with the logging instrument is lowered. After the special drill pipe is lowered to the bottom of the well, the instrument is pushed out to start logging.

[0004] However, the above-mentioned dual laterolog tools all have the disadvantages of low logging efficiency and delayed logging operation. With the rapid development of oil exploration and logging technology, it is urgent to reduce the intensity of logging operations and improve the logging timeliness. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a high temperature resistant constant power dual laterolog tool. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0006] The present invention provides a high temperature resistant constant power dual lateral logging tool, comprising an electronic instrument short section and an electrode system short section, wherein:

[0007] The electronic instrument short section includes a first pressure-bearing outer protective tube and an electronic instrument arranged inside the first pressure-bearing outer protective tube;

[0008] The electrode system short section comprises a second upper pressure-bearing insulating outer protective tube, a second lower pressure-bearing insulating outer protective tube, and a mandrel arranged inside the second upper pressure-bearing insulating outer protective tube and the second lower pressure-bearing insulating outer protective tube, a plurality of electrode rings are sleeved on the mandrel, an insulating sleeve is arranged between adjacent electrode rings, and the plurality of electrode rings and the plurality of insulating sleeves are positioned between the second upper pressure-bearing insulating outer protective tube and the second lower pressure-bearing insulating outer protective tube;

[0009] The lower end of the first pressure-bearing outer protective tube is connected to the upper end of the second upper pressure-bearing insulating outer protective tube, and the multiple electrode rings are all connected to the electronic instrument.

[0010] In one embodiment of the present invention, the outer diameters of the first pressure-bearing outer protective tube, the second upper pressure-bearing insulating outer protective tube, the second lower pressure-bearing insulating outer protective tube and the plurality of electrode rings are all 43 mm.

[0011] In one embodiment of the present invention, the electronic instrument includes a first voltage-stabilized power supply circuit board, a second voltage-stabilized power supply circuit board, a control acquisition circuit board, a logic control circuit board, a voltage signal detection circuit board, a current signal detection circuit board, a deep lateral screen current drive circuit board, a shallow lateral screen current drive circuit board, a main monitoring circuit board, an auxiliary monitoring circuit board, a scale zeroing circuit board and a main current preamplification circuit board, wherein:

[0012] The first voltage-stabilized power supply circuit board is used to isolate and convert a 100-130V DC power supply into a ±12V voltage-stabilized DC power supply and provide it to the control acquisition circuit board, the logic control circuit board, the voltage signal detection circuit board, the current signal detection circuit board, the deep lateral screen current drive circuit board, the shallow lateral screen current drive circuit board, the main monitoring circuit board, the auxiliary monitoring circuit board, the scale zeroing circuit board and the main current preamplification circuit board respectively;

[0013] The second voltage-stabilized power supply circuit board is used to isolate and convert the 100-130V DC power supply into three groups of voltage-stabilized DC power supplies and provide them to the control acquisition circuit board, the logic control circuit board and the scale zeroing circuit board respectively;

[0014] The control acquisition circuit board is used to convert the DC analog voltage signal from the voltage signal detection circuit board and the DC analog current signal from the current signal detection circuit board into digital signals, and generate a deep lateral power control signal and a shallow lateral power control signal according to the digital signals;

[0015] The logic control circuit board is used to generate a deep lateral logic square wave and a shallow lateral logic square wave, and to form the deep lateral power control signal and the shallow lateral power control signal by chopping the deep lateral logic square wave and the shallow lateral logic square wave respectively;

[0016] The voltage signal detection circuit board is used to convert the AC voltage signals of the deep lateral main current and the shallow lateral main current into DC analog voltage signals respectively;

[0017] The current signal detection circuit board is used to convert the AC current signals of the deep lateral main current and the shallow lateral main current into DC analog current signals;

[0018] The deep lateral screen current driving circuit board is used to receive the deep lateral power control signal from the logic control circuit board, amplify and shape it into a deep lateral current source;

[0019] The shallow lateral screen current driving circuit board is used to receive the shallow lateral power control signal from the logic control circuit board, amplify and shape it into a shallow lateral current source;

[0020] The main monitoring circuit board is used to receive the deep and shallow lateral main current difference zero balance signals from the main current preamplification circuit board, and perform bandpass amplification respectively to achieve compensation and balance of the main current supply current;

[0021] The auxiliary monitoring circuit board is used to receive the deep lateral shielding current difference zero balance signal from the electrode ring, and realize compensation and balance of the main current supply current after bandpass amplification;

[0022] The scale zero circuit board includes a control relay and a scale resistor, which is used for switching between the scale and logging states and providing a standard resistor for the scale state, and changing the connection method of part of the circuit board;

[0023] The main current preamplifier circuit board is used to couple and amplify the deep and shallow lateral main current difference zero signals from the electrode ring and send them to the main monitoring circuit board.

[0024] In one embodiment of the present invention, the electronic instrument further comprises:

[0025] A voltage signal coupling input transformer is connected between the voltage signal detection circuit board and the scale zeroing circuit board, and is used for coupling and amplifying the voltage signals of the deep and shallow lateral main currents;

[0026] A current signal coupling input transformer is connected between the current signal detection circuit board and the scale zero circuit board, and is used for coupling and amplifying the current signals of the deep and shallow lateral main currents;

[0027] A deep lateral screen current output transformer, connected between the deep lateral screen current drive circuit board and the scale zero circuit board, for power coupling output of the deep lateral screen current source signal;

[0028] A shallow lateral screen current output transformer, connected between the shallow lateral screen current driving circuit board and the scale zeroing circuit board, for power coupling output of the shallow lateral screen current source signal;

[0029] A main monitoring output transformer, connected between the main monitoring circuit board and the scale zeroing circuit board, for coupling and outputting the deep and shallow lateral monitoring signals;

[0030] An auxiliary monitoring output transformer, connected between the auxiliary monitoring circuit board and the scale zeroing circuit board, for coupling and outputting the auxiliary monitoring signal in the deep lateral direction;

[0031] The main current pre-coupling amplifier transformer is connected between the main current pre-amplifying circuit board and the electrode ring, and is used for coupling and amplifying the deep and shallow lateral difference zero-balance signals and outputting them.

[0032] In one embodiment of the present invention, the double lateral electronic instrument short section is divided into an electronic instrument short section A section, an electronic instrument short section B section and an electronic instrument short section C section along the axial direction, wherein the first voltage-stabilized power supply circuit board, the second voltage-stabilized power supply circuit board, the control acquisition circuit board and the logic control circuit board are arranged in the electronic instrument short section A section;

[0033] The voltage signal detection circuit board, the current signal detection circuit board, the deep lateral screen current driving circuit board, the shallow lateral screen current driving circuit board, the voltage signal coupling input transformer, the current signal coupling input transformer, the deep lateral screen current output transformer and the shallow lateral screen current output transformer are arranged in the electronic instrument short section B;

[0034] The main monitoring circuit board, the auxiliary monitoring circuit board, the scale zeroing circuit board, the main current preamplifier circuit board, the main monitoring output transformer, the auxiliary monitoring output transformer and the main current preamplifier transformer are arranged in the electronic instrument short section C section.

[0035] In one embodiment of the present invention, the electrode ring A2, electrode ring A1*, electrode ring A1, electrode ring M2, electrode ring M1, electrode ring A0, electrode ring M1', electrode ring M2', electrode ring A1', electrode ring A1*' and electrode ring A2' are sequentially arranged on the mandrel, wherein:

[0036] The electrode ring A2, the electrode ring A1*, the electrode ring A1, the electrode ring A0 and the electrode ring A2' are respectively connected to different ports of the scale zero circuit board;

[0037] The electrode ring M2, the electrode ring M1, the electrode ring M1' and the electrode ring M2' are respectively connected to different ports of the main current preamplifier circuit board;

[0038] The electrode ring A1 ′ is connected to the electrode ring A1 , and the electrode ring A1 *′ is connected to the electrode ring A1 *.

[0039] In one embodiment of the present invention, the upper end of the double lateral electronic instrument short section is provided with a first upper protective cap, and the lower end is provided with a first lower protective cap, and the upper end of the double lateral electrode system short section is provided with a second upper protective cap, and the lower end is provided with a second lower protective cap.

[0040] In one embodiment of the present invention, the first voltage-stabilized power supply circuit board, the second voltage-stabilized power supply circuit board, the control acquisition circuit board, the logic control circuit board, the voltage signal detection circuit board, the current signal detection circuit board, the deep lateral screen current drive circuit board, the shallow lateral screen current drive circuit board, the main monitoring circuit board, the auxiliary monitoring circuit board, the scale zeroing circuit board and the main current preamplifier circuit board are respectively fixed to the inside of the first pressure-bearing outer protective tube by screws and are packaged by glue pouring.

[0041] In one embodiment of the present invention, a through hole is provided inside the core shaft for passing the wire through.

[0042] In one embodiment of the present invention, the core shaft and the electrode ring are both made of titanium steel material, and the insulating sleeve is made of PEEK material.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] 1. The high temperature resistant constant power dual lateral logging instrument of the present invention has a small outer diameter and can be stored in the drill pipe in advance. After drilling the well, the instrument is pumped out of the center hole of the drill bit through the mud, and logging can be performed while the drill pipe is lifted, which effectively improves the logging efficiency.

[0045] 2. The electronic circuit of the high temperature resistant constant power dual lateral logging tool is divided into three sections, each section is sealed with high temperature resistant silicone, which effectively plays the role of anti-rotation, anti-vibration and shock absorption.

[0046] 3. Most of the components used in the circuit board of the high-temperature resistant constant-power dual lateral logging instrument of the present invention are high-temperature resistant surface mount type, and the overall temperature resistance index can reach 175°C.

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a structural schematic diagram of a high temperature resistant constant power dual laterolog tool provided by an embodiment of the present invention;

[0049] Figure 2 It is a structural schematic diagram of an electronic instrument short section provided by an embodiment of the present invention;

[0050] Figure 3 It is a structural schematic diagram of an electrode system short section provided by an embodiment of the present invention;

[0051] Figure 4The present invention provides a circuit schematic diagram of a high temperature resistant constant power dual laterolog tool. DETAILED DESCRIPTION

[0052] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, a high temperature resistant constant power dual laterologging tool proposed according to the present invention is described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0053] The above and other technical contents, features and effects of the present invention are clearly presented in the following detailed description of the specific implementation modes in conjunction with the accompanying drawings. Through the description of the specific implementation modes, the technical means and effects adopted by the present invention to achieve the predetermined purpose can be more deeply and specifically understood. However, the attached drawings are only for reference and explanation purposes and are not used to limit the technical solutions of the present invention.

[0054] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements that are not explicitly listed. In the absence of more restrictions, the elements defined by the statement "including one..." do not exclude the existence of other identical elements in the article or device including the elements.

[0055] Embodiment 1

[0056] See also Figures 1 to 3 , Figure 1 Schematic diagram of the structure of a high temperature resistant constant power dual laterolog tool provided by an embodiment of the present invention. Figure 2 It is a structural schematic diagram of an electronic instrument short section provided by an embodiment of the present invention; Figure 3It is a structural schematic diagram of an electrode system short section provided by an embodiment of the present invention. As shown in the figure, the high temperature resistant constant power dual lateral logging tool of this embodiment includes an electronic instrument short section 1 and an electrode system short section 2, wherein the electronic instrument short section 1 includes a first pressure-bearing outer protective tube 11 and an electronic instrument 12 arranged inside the first pressure-bearing outer protective tube 11; the electrode system short section 2 includes a second upper pressure-bearing insulating outer protective tube 21, a second lower pressure-bearing insulating outer protective tube 22, and a core shaft 23 arranged inside the second upper pressure-bearing insulating outer protective tube 21 and the second lower pressure-bearing insulating outer protective tube 22, a plurality of electrode rings are sleeved on the core shaft 23, an insulating sleeve 24 is arranged between adjacent electrode rings, and the plurality of electrode rings and the plurality of insulating sleeves 24 are all positioned between the second upper pressure-bearing outer protective tube 21 and the second lower pressure-bearing outer protective tube 22; the lower end of the first pressure-bearing outer protective tube 11 is connected to the upper end of the second upper pressure-bearing outer protective tube 21, and the plurality of electrode rings are all connected to the electronic instrument 12.

[0057] Furthermore, the outer diameters of the first pressure-bearing outer protective tube 11, the second upper pressure-bearing insulating outer protective tube 21, the second lower pressure-bearing insulating outer protective tube 22 and the plurality of electrode rings are all 43 mm. Since the outer diameter of the high-temperature resistant constant-power dual lateral logging instrument of this embodiment is relatively small, it can be stored in the drill pipe in advance. After drilling the well, the instrument is pumped out of the center hole of the drill bit through the mud, and logging is performed while the drill pipe is lifted, which effectively improves the logging efficiency.

[0058] For further information, see Figure 4 , Figure 4 The electronic instrument 12 of this embodiment includes a first voltage-stabilized power supply circuit board AP01, a second voltage-stabilized power supply circuit board AP02, a control acquisition circuit board AP03, a logic control circuit board AP04, a voltage signal detection circuit board AP05, a current signal detection circuit board AP06, a deep lateral screen current driving circuit board AP07, a shallow lateral screen current driving circuit board AP08, a main monitoring circuit board AP09, an auxiliary monitoring circuit board AP10, a scale zeroing circuit board AP11, a main current pre-amplification circuit board AP12, a voltage signal coupling input transformer T1, a current signal coupling input transformer T2, a deep lateral screen current output transformer T3, a shallow lateral screen current output transformer T4, a main monitoring output transformer T5, an auxiliary monitoring output transformer T6, and a main current pre-coupling amplifier transformer T7.

[0059] The first voltage-stabilized power supply circuit board AP01 is a 175°C high-temperature resistant switch conversion power supply circuit board, which can isolate and convert the 100-130V DC power supply provided by the cable core into a ±12V regulated DC working power supply, and respectively provide ±12V regulated DC power supply to the control acquisition circuit board AP03, the logic control circuit board AP04, the voltage signal detection circuit board AP05, the current signal detection circuit board AP06, the deep lateral screen current drive circuit board AP07, the shallow lateral screen current drive circuit board AP08, the main monitoring circuit board AP09, the auxiliary monitoring circuit board AP10 and the main current preamplifier circuit board AP12, and only provide +12V regulated DC power supply to the scale zero circuit board AP11.

[0060] The second voltage-stabilized power supply circuit board AP02 is a 175°C high temperature resistant switch conversion power supply circuit board, which can isolate and convert the 100-130V DC power supply provided by the cable core into three sets of voltage-stabilized DC power supplies and provide them to the control acquisition circuit board AP03, the logic control circuit board AP04 and the scale zero circuit board AP11 respectively. Specifically: a) Digital logic power supply +5VD, the common end is the digital ground DGND, providing digital logic power supply +5VD to the control acquisition circuit board AP03 and the logic control circuit board AP04; b) CAN bus DC power supply +5VC, the common end is the CAN bus ground CGND, providing CAN bus DC power supply +5VC to the logic control circuit board AP04; c) Relay power supply +24V, the common end is the digital ground DGND, providing power to the relay of the scale zero circuit board AP11.

[0061] The control acquisition circuit board AP03 can convert the DC analog voltage signal from the voltage signal detection circuit board AP05 and the DC analog current signal from the current signal detection circuit board AP06 into digital signals, and generate deep lateral power control signals and shallow lateral power control signals according to the digital signals. Specifically, the control acquisition circuit board AP03 performs digital acquisition and processing on the analog electrical signals obtained by the logging instrument, processes, calculates and saves them in real time, and can also receive instructions and send control commands.

[0062] The logic control circuit board AP04 can generate a deep lateral logic square wave and a shallow lateral logic square wave, and form a deep lateral power control signal and a shallow lateral power control signal by chopping the deep lateral logic square wave and the shallow lateral logic square wave. Specifically, the logic control circuit board AP04 generates deep and shallow lateral logic square waves, chopping and converting and adjusting the levels of the deep and shallow lateral power control signals sent by the control acquisition circuit board AP03, and then sending them to the deep lateral screen current drive circuit board AP07 and the shallow lateral screen current drive circuit board AP08 respectively; at the same time, it can receive instructions and send data for the CAN (Controller Area Network) bus.

[0063] The voltage signal detection circuit board AP05 can convert the AC voltage signal of the deep and shallow lateral main current into a DC analog voltage signal. Specifically, the voltage signal detection circuit board AP05 can convert the AC voltage signal of the deep and shallow lateral main current sent by the main current pre-coupling amplifier transformer T7 into a DC analog signal through a bandpass separation amplifier circuit, a phase-sensitive detection circuit and a low-pass shaping circuit, and send it to the control acquisition circuit board AP03.

[0064] The current signal detection circuit board AP06 can convert the AC current signals of the deep and shallow lateral main currents into DC analog current signals. Specifically, the current signal detection circuit board AP06 converts the AC current signals of the deep and shallow lateral main currents sent by the main current pre-coupling amplifier transformer T7 into DC analog signals through the bandpass separation amplifier circuit, phase-sensitive detection circuit and low-pass shaping circuit, and sends them to the control acquisition circuit board AP03.

[0065] The deep lateral screen current driving circuit board AP07 can receive the deep lateral power control signal from the logic control circuit board AP04, amplify and shape it into a deep lateral current source. Specifically, the deep lateral screen current driving circuit board AP07 receives the deep lateral power control signal (DPL) from the logic control circuit board AP04, amplifies and shapes it into a sine wave, and then outputs the power amplification to the deep lateral power output transformer.

[0066] The shallow lateral screen current driver circuit board AP08 can receive the shallow lateral power control signal from the logic control circuit board AP04, amplify and shape it into a shallow lateral current source. Specifically, it receives the shallow lateral power control signal (SPL) from the logic control circuit board AP04, amplifies and shapes it into a sine wave, and then outputs the power amplification to the shallow lateral power output transformer.

[0067] The main monitoring circuit board AP09 can receive the deep and shallow lateral main current difference zero balance signals from the main current preamplifier circuit board AP12, respectively perform bandpass amplification, and realize compensation and balance of the main current supply current. Specifically, the deep and shallow lateral main current difference zero balance signals from the main current preamplifier circuit board AP12 are received, respectively perform bandpass amplification, and then output to the main monitoring coupling transformer.

[0068] The auxiliary monitoring circuit board AP10 can receive the deep lateral shielding current difference zero-balanced signal from the electrode ring, and after bandpass amplification, realize compensation and balance of the main current supply current. Specifically, it receives the deep lateral shielding current difference zero-balanced signal from the balance electrode A1* and the shielding electrode A2, and after bandpass amplification, outputs it to the auxiliary monitoring coupling transformer.

[0069] The calibration zero circuit board AP11 includes a control relay and a calibration resistor, which can switch the calibration and logging states, provide a standard resistor for the calibration state, and change the connection method of some circuit boards. Specifically, it receives the control command of the relay, converts the calibration points of the instrument (low calibration, high calibration, logging), and the ground processing system performs two-point calibration on the data measured by the instrument in real time, and calculates the deep and shallow lateral resistivity curves.

[0070] The main current preamplifier circuit board AP12 can couple and amplify the deep and shallow lateral main current difference zero signals from the electrode ring and send them to the main monitoring circuit board AP09. Specifically, the deep and shallow lateral main current difference zero signals coming from the balance electrodes (M1, M2, M1', M2') are coupled and amplified and sent to the input end of the main monitoring circuit board.

[0071] Furthermore, the voltage signal coupling input transformer T1 is connected between the voltage signal detection circuit board AP05 and the scale zero circuit board AP11, and is used to couple and amplify the voltage signals of the deep and shallow lateral main currents; the current signal coupling input transformer T2 is connected between the current signal detection circuit board AP06 and the scale zero circuit board AP11, and is used to couple and amplify the current signals of the deep and shallow lateral main currents; the deep lateral screen current output transformer T3 is connected between the deep lateral screen current drive circuit board AP07 and the scale zero circuit board AP11, and is used to couple and output the power of the deep lateral screen current source signal; the shallow lateral screen current output transformer T4 is connected between the shallow lateral screen current drive circuit board AP07 and the scale zero circuit board AP11, and is used to couple and output the power of the deep lateral screen current source signal. The main monitoring output transformer T5 is connected between the main monitoring circuit board AP09 and the scale zero circuit board AP11, and is used for coupling and outputting the shallow lateral screen current source signal; the auxiliary monitoring output transformer T6 is connected between the auxiliary monitoring circuit board AP10 and the scale zero circuit board AP11, and is used for coupling and outputting the deep and shallow lateral monitoring signals; the main current pre-coupling amplifier transformer T7 is connected between the main current pre-amplifier circuit board AP12 and the electrode ring, and is used for coupling and outputting the deep and shallow lateral difference zero balance signals.

[0072] Furthermore, the double lateral electronic instrument short section 1 is divided into an electronic instrument short section A, an electronic instrument short section B and an electronic instrument short section C along the axial direction, wherein the first voltage-stabilized power supply circuit board AP01, the second voltage-stabilized power supply circuit board AP02, the control acquisition circuit board AP03 and the logic control circuit board AP04 are arranged in the electronic instrument short section A; the voltage signal detection circuit board AP05, the current signal detection circuit board AP06, the deep lateral screen current drive circuit board AP07, the shallow lateral screen current drive circuit board AP08, the voltage signal coupling input transformer T1, the current signal coupling input transformer T2, the deep lateral screen current output transformer T3 and the shallow lateral screen current output transformer T4 are arranged in the electronic instrument short section B; the main monitoring circuit board AP09, the auxiliary monitoring circuit board AP10, the scale zeroing circuit board AP11, the main current preamplifier circuit board AP12, the main monitoring output transformer T5, the auxiliary monitoring output transformer T6 and the main current preamplifier transformer T7 are arranged in the electronic instrument short section C.

[0073] Furthermore, the electrode rings A2, A1*, A1, M2, M1, A0, M1', M2', A1', A1*' and A2' are sequentially arranged on the core shaft 23, wherein:

[0074] The electrode ring A2, the electrode ring A1*, the electrode ring A1, the electrode ring A0 and the electrode ring A2' are respectively connected to different ports of the scale zero circuit board AP11;

[0075] The electrode ring M2, the electrode ring M1, the electrode ring M1' and the electrode ring M2' are respectively connected to different ports of the main current preamplifier circuit board AP12;

[0076] The electrode ring A1 ′ is connected to the electrode ring A1 , and the electrode ring A1 *′ is connected to the electrode ring A1 *.

[0077] Furthermore, the upper end of the double lateral electronic instrument short section 1 is provided with a first upper protective cap 13, and the lower end is provided with a first lower protective cap 17, and the upper end of the double lateral electrode system short section 2 is provided with a second upper protective cap 20, and the lower end is provided with a second lower protective cap 29.

[0078] Furthermore, the upper end of the double lateral electronic instrument short section 1 is also provided with a ten-core pressure socket 14 (circular connector) and a first upper connector 15, wherein the ten-core pressure socket 14 is used to connect the power supply and signal channel connection, and can withstand a certain pressure, and the lower end of the double lateral electronic instrument short section 1 is also provided with a nineteen-core pressure plug 16. The upper end of the double lateral electrode system short section 2 is also provided with a nineteen-core pressure socket 25 and a second upper connector 26, and the lower end of the double lateral electrode system short section 2 is also provided with a ten-core pressure socket 27 and a second lower connector 28.

[0079] Furthermore, the first voltage-stabilized power supply circuit board AP01, the second voltage-stabilized power supply circuit board AP02, the control acquisition circuit board AP03, the logic control circuit board AP04, the voltage signal detection circuit board AP05, the current signal detection circuit board AP06, the deep lateral screen current driving circuit board AP07, the shallow lateral screen current driving circuit board AP08, the main monitoring circuit board AP09, the auxiliary monitoring circuit board AP10, the scale zeroing circuit board AP11 and the main current preamplifier circuit board AP12 are all fixed to the inside of the first pressure-bearing outer protective tube 11 by screws and are encapsulated by glue filling.

[0080] Furthermore, a through hole (not shown in the drawings) is provided inside the core shaft 23 for passing a wire through.

[0081] Furthermore, the core shaft 23 and the electrode ring are both made of titanium steel material, and the insulating sleeve 24 is made of PEEK material.

[0082] The double lateral electronic instruments of this embodiment all use surface-mounted high-temperature devices, miniaturized high-temperature toroidal iron core transformers, highly integrated power devices, small high-temperature relays, etc. The circuit is divided into three sections, each section is sealed with high-temperature resistant silicone, which effectively plays the role of anti-rotation, anti-vibration, and shock absorption; the electrode system is composed of a titanium steel core shaft, a variety of titanium steel electrode rings, PEEK insulators, pressure-bearing connectors, high-temperature wires and other machined parts.

[0083] The working principle of the high temperature resistant constant power dual laterologger of this embodiment is as follows:

[0084] When the instrument starts working, the logic control circuit board AP04 generates a deep lateral logic square wave (35Hz, QD) and a shallow lateral logic square wave (280Hz, QS). These two sets of logic square waves chop the deep and shallow lateral power control levels sent by the control acquisition circuit board AP03, so that the power control level is successfully controlled by the square wave output (deep lateral power control output DPL, shallow lateral power control output SPL). Among them, DPL is sent to the deep lateral screen current driving circuit board AP07, shaped by a 35Hz bandpass, amplified by power, and outputs the deep screen current (DPout) from the deep lateral screen current output transformer T3; SPL is sent to the shallow lateral screen current driving circuit board AP08, shaped by a 280Hz bandpass, amplified by power, and outputs the shallow screen current (SPout) from the shallow lateral screen current output transformer T4. Then the deep and shallow lateral main current difference zero signals at the balancing electrodes (M1, M2, M1', M2') are coupled and amplified by the main current pre-coupling amplifier transformer T7 and sent to the input terminal AP09 of the main monitoring circuit board, which amplifies the deep and shallow lateral difference zero signals by frequency-selective bandpass, and then outputs Zout through the main monitoring output transformer T5. At the same time, the deep lateral shielding current difference zero balance signals of the balancing electrode A1* and the shielding electrode A2 are amplified by the deep lateral frequency-selective bandpass, and then output Fout by the auxiliary monitoring coupling transformer T6. These two groups of output combinations are loaded on the formation load to form the deep and shallow lateral main currents, which are then balanced with the deep and shallow lateral screen current sources (DPout, SPout) to generate a new difference zero balance signal - new main current - new screen current source - the new main current and the new screen current source are superimposed to output a new difference zero balance signal - new main current - new screen current source - new difference zero balance signal, and so on. At the same time, the voltage signals (VD, VS) of the converted deep and shallow lateral main currents are received in real time through the voltage coupling amplifying transformer T1 and the voltage signal detection circuit board AP05; ​​the current signals (ID, IS) of the converted deep and shallow lateral main currents are received in real time through the current coupling amplifying transformer T2 and the current signal detection circuit board AP06.

[0085] The scale zero circuit board AP11 is designed to set a two-point resistivity scale when calculating deep and shallow lateral resistivity curves. The control command is issued by the control acquisition circuit board AP03. Usually, the two-point scales of 0Ω·m and 31.62Ω·m are used.

[0086] The high temperature resistant constant power dual lateral logging instrument and the telemetry instrument (data transmission nipple) of this embodiment can exchange data via the CAN bus, and the receiving and sending driving circuit boards of the CAN bus are designed on the logic control circuit board AP04.

[0087] The high temperature constant power dual lateral logging instrument of this embodiment has a small outer diameter and can be stored in the drill pipe in advance. After drilling the well, the instrument is pumped out of the center hole of the drill bit through the mud, and the well is logged while the drill pipe is lifted, which effectively improves the logging efficiency. In addition, the electronic instrument circuit board of the high temperature constant power dual lateral logging instrument is divided into three sections, each of which is sealed with high temperature resistant silicone, which effectively plays the role of anti-rotation, anti-vibration, and shock absorption.

[0088] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A high temperature resistant constant power dual lateral logging tool, characterized in that: It comprises an electronic instrument short section (1) and an electrode system short section (2), wherein: The electronic instrument short section (1) comprises a first pressure-bearing outer protective tube (11) and an electronic instrument (12) arranged inside the first pressure-bearing outer protective tube (11); The electrode system short section (2) comprises a second upper pressure-bearing insulating outer protective tube (21), a second lower pressure-bearing insulating outer protective tube (22), and a core shaft (23) arranged inside the second upper pressure-bearing insulating outer protective tube (21) and the second lower pressure-bearing insulating outer protective tube (22); a plurality of electrode rings are sleeved on the core shaft (23); an insulating sleeve (24) is arranged between adjacent electrode rings; and the plurality of electrode rings and the plurality of insulating sleeves (24) are positioned between the second upper pressure-bearing insulating outer protective tube (21) and the second lower pressure-bearing insulating outer protective tube (22); The lower end of the first pressure-bearing outer protective tube (11) is connected to the upper end of the second upper pressure-bearing insulating outer protective tube (21), and the plurality of electrode rings are all connected to the electronic instrument (12). The outer diameters of the first pressure-bearing outer protective tube (11), the second upper pressure-bearing insulating outer protective tube (21), the second lower pressure-bearing insulating outer protective tube (22) and the plurality of electrode rings are all 43 mm. The electronic instrument (12) comprises a first voltage-stabilized power supply circuit board (AP01), a second voltage-stabilized power supply circuit board (AP02), a control acquisition circuit board (AP03), a logic control circuit board (AP04), a voltage signal detection circuit board (AP05), a current signal detection circuit board (AP06), a deep lateral screen current driving circuit board (AP07), a shallow lateral screen current driving circuit board (AP08), a main monitoring circuit board (AP09), an auxiliary monitoring circuit board (AP10), a scale zeroing circuit board (AP11) and a main current preamplification circuit board (AP12), wherein: The first voltage-stabilized power supply circuit board (AP01) is used to isolate and convert a DC power supply within the range of 100-130V into a ±12V voltage-stabilized DC power supply and provide it to the control acquisition circuit board (AP03), the logic control circuit board (AP04), the voltage signal detection circuit board (AP05), the current signal detection circuit board (AP06), the deep lateral screen current driving circuit board (AP07), the shallow lateral screen current driving circuit board (AP08), the main monitoring circuit board (AP09), the auxiliary monitoring circuit board (AP10), the scale zeroing circuit board (AP11) and the main current preamplification circuit board (AP12); The second voltage-stabilized power supply circuit board (AP02) is used to isolate and convert a DC power supply within the range of 100-130V into three groups of voltage-stabilized DC power supplies and provide them to the control acquisition circuit board (AP03), the logic control circuit board (AP04) and the scale zeroing circuit board (AP11) respectively; The control acquisition circuit board (AP03) is used to convert the DC analog voltage signal from the voltage signal detection circuit board (AP05) and the DC analog current signal from the current signal detection circuit board (AP06) into digital signals, and generate a deep lateral power control signal and a shallow lateral power control signal according to the digital signals; The logic control circuit board (AP04) is used to generate a deep lateral logic square wave and a shallow lateral logic square wave, and to form the deep lateral power control signal and the shallow lateral power control signal by chopping the deep lateral logic square wave and the shallow lateral logic square wave respectively; The voltage signal detection circuit board (AP05) is used to convert the AC voltage signals of the deep lateral main current and the shallow lateral main current into DC analog voltage signals respectively; The current signal detection circuit board (AP06) is used to convert the AC current signals of the deep lateral main current and the shallow lateral main current into DC analog current signals; The deep lateral screen current driving circuit board (AP07) is used to receive the deep lateral power control signal from the logic control circuit board (AP04), amplify and shape it into a deep lateral current source; The shallow lateral screen current driving circuit board (AP08) is used to receive the shallow lateral power control signal from the logic control circuit board (AP04), amplify and shape it into a shallow lateral current source; The main monitoring circuit board (AP09) is used to receive the deep and shallow lateral main current difference zero balance signals from the main current preamplification circuit board (AP12), and perform bandpass amplification respectively to achieve compensation and balance of the main current supply current; The auxiliary monitoring circuit board (AP10) is used to receive the deep lateral shielding current difference zero balance signal from the electrode ring, and achieve compensation and balance of the main current supply current after bandpass amplification; The scale zero circuit board (AP11) includes a control relay and a scale resistor, which is used for switching between the scale and logging states and providing a standard resistor for the scale state, and changing the connection method of part of the circuit board; The main current preamplifier circuit board (AP12) is used to couple and amplify the deep and shallow lateral main current difference zero signals from the electrode ring and send them to the main monitoring circuit board (AP09).

2. The high temperature resistant constant power dual laterologging tool according to claim 1, characterized in that: The electronic device (12) further comprises: A voltage signal coupling input transformer (T1) is connected between the voltage signal detection circuit board (AP05) and the scale zeroing circuit board (AP11) and is used for coupling and amplifying the voltage signals of the deep and shallow lateral main currents; A current signal coupling input transformer (T2), connected between the current signal detection circuit board (AP06) and the scale zeroing circuit board (AP11), is used to couple and amplify the current signals of the deep and shallow lateral main currents; A deep lateral screen current output transformer (T3), connected between the deep lateral screen current driving circuit board (AP07) and the scale zeroing circuit board (AP11), for outputting power coupling of the deep lateral screen current source signal; A shallow lateral screen current output transformer (T4), connected between the shallow lateral screen current driving circuit board (AP08) and the scale zeroing circuit board (AP11), for outputting power coupling of the shallow lateral screen current source signal; A main monitoring output transformer (T5), connected between the main monitoring circuit board (AP09) and the scale zeroing circuit board (AP11), is used for coupling and outputting the deep and shallow lateral monitoring signals; An auxiliary monitoring output transformer (T6), connected between the auxiliary monitoring circuit board (AP10) and the scale zeroing circuit board (AP11), and used for coupling and outputting the auxiliary monitoring signal in the deep lateral direction; A main current pre-coupling amplifier transformer (T7) is connected between the main current pre-amplifying circuit board (AP12) and the electrode ring, and is used for coupling and amplifying the deep and shallow lateral difference zero-balance signals for output.

3. The high temperature resistant constant power dual laterologging tool according to claim 2, characterized in that: The electronic instrument short section (1) is divided into an electronic instrument short section A section (A), an electronic instrument short section B section (B) and an electronic instrument short section C section (C) along the axial direction, wherein the first voltage-stabilized power supply circuit board (AP01), the second voltage-stabilized power supply circuit board (AP02), the control acquisition circuit board (AP03) and the logic control circuit board (AP04) are arranged in the electronic instrument short section A section (A); The voltage signal detection circuit board (AP05), the current signal detection circuit board (AP06), the deep lateral screen current driving circuit board (AP07), the shallow lateral screen current driving circuit board (AP08), the voltage signal coupling input transformer (T1), the current signal coupling input transformer (T2), the deep lateral screen current output transformer (T3) and the shallow lateral screen current output transformer (T4) are arranged in the electronic instrument short section B (B); The main monitoring circuit board (AP09), the auxiliary monitoring circuit board (AP10), the scale zeroing circuit board (AP11), the main current pre-amplification circuit board (AP12), the main monitoring output transformer (T5), the auxiliary monitoring output transformer (T6) and the main current pre-coupling amplifier transformer (T7) are arranged in the electronic instrument short section C section (C).

4. The high temperature resistant constant power dual laterologging tool according to claim 3, characterized in that: The electrode ring A2, electrode ring A1*, electrode ring A1, electrode ring M2, electrode ring M1, electrode ring A0, electrode ring M1', electrode ring M2', electrode ring A1', electrode ring A1*' and electrode ring A2' are arranged on the core shaft (23) in sequence and at intervals, wherein: The electrode ring A2, the electrode ring A1*, the electrode ring A1, the electrode ring A0 and the electrode ring A2' are respectively connected to different ports of the scale zero circuit board (AP11); The electrode ring M2, the electrode ring M1, the electrode ring M1' and the electrode ring M2' are respectively connected to different ports of the main current preamplifier circuit board (AP12); The electrode ring A1 ′ is connected to the electrode ring A1 , and the electrode ring A1 *′ is connected to the electrode ring A1 *.

5. The high temperature resistant constant power dual laterologging tool according to claim 1, characterized in that: The upper end of the electronic instrument short section (1) is provided with a first upper protective cap (13), and the lower end is provided with a first lower protective cap (17); the upper end of the electrode system short section (2) is provided with a second upper protective cap (20), and the lower end is provided with a second lower protective cap (29).

6. The high temperature resistant constant power dual laterologging tool according to claim 3, characterized in that: A first voltage-stabilized power supply circuit board (AP01), a second voltage-stabilized power supply circuit board (AP02), a control acquisition circuit board (AP03), a logic control circuit board (AP04), a voltage signal detection circuit board (AP05), a current signal detection circuit board (AP06), a deep lateral screen current driving circuit board (AP07), a shallow lateral screen current driving circuit board (AP08), a main monitoring circuit board (AP09), an auxiliary monitoring circuit board (AP10), a scale zeroing circuit board (AP11) and a main current preamplification circuit board (AP12) are respectively fixed inside the first pressure-bearing outer protective tube (11) by screws and are packaged by glue potting.

7. The high temperature resistant constant power dual laterologging tool according to claim 1, characterized in that: A through hole is provided inside the core shaft (23) for passing a wire through.

8. The high temperature resistant constant power dual laterologging tool according to any one of claims 1 to 7, characterized in that: The core shaft (23) and the electrode ring are both made of titanium steel material, and the insulating sleeve (24) is made of PEEK material.

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