High-temperature-resistant, corrosion-resistant and high-strength dual lateral electrode system

Abstract

The utility model relates to the technical field of dual lateral loggers, in particular to a high-temperature-resistant corrosion-resistant high-strength dual lateral electrode system which comprises an upper connector, a lower connector and a mandrel, the upper connector and the lower connector are located at the two ends of the mandrel respectively, and the upper connector and the lower connector are used for connecting and fixing the two ends of the electrode system. The other side of the upper connector and the other side of the lower connector are both provided with protective caps in a threaded mode, and the two sides of the mandrel are further sleeved with an upper core pipe and a lower core pipe respectively. Compared with the prior art, various electrodes and various insulation sleeves all adopt modular independent design, mutual interference between the electrodes is avoided, disassembly, assembly and maintenance are convenient, the overall service life of the electrode system is effectively prolonged, 17-4PH stainless steel is adopted as a base material of the metal composite electrode ring, conductive oxide is compounded on the outer surface of the metal composite electrode ring, and the service life of the electrode system is prolonged. While high strength and corrosion resistance of the electrode ring are ensured, the influence of underground electrochemical reaction on electrode potential is eliminated, and necessary conditions are provided for obtaining real and reliable formation resistivity.

Description

Technical Field

[0001] The utility model relates to the technical field of dual lateral logging instruments, in particular to a high-temperature resistant, corrosion-resistant and high-strength dual lateral electrode system. Background Art

[0002] Dual Lateral Logging is an instrument for measuring formation resistivity in open-hole wells in oil fields. It is one of the main equipment for resistivity logging. It can simultaneously measure the apparent resistivity of two different detection depths, namely the resistivity of the invasion zone and the resistivity of the original formation. It can determine and evaluate the oil-bearing characteristics of the formation in combination with other logging data. The dual lateral electrode system is an important part of the dual lateral logging instrument. The transmitting circuit establishes a dynamic and uniform equipotential cylindrical electric field on the electrode surface, and makes the current beam of the cylindrical electric field flow into the formation in the radial direction until it reaches the recognized zero-potential formation. The circuit short section calculates the formation resistivity by measuring the voltage and current.

[0003] With the rapid development of oil exploration technology, drilling technology continues to challenge deeper formations. In order to cope with complex well conditions and achieve logging requirements of 10,000-meter well depths, it is necessary to equip logging instruments that are resistant to high temperatures, corrosion, and high in strength. Most of the domestic dual lateral electrode systems use metal electrodes and rubber vulcanized into an integrated model. Insulation damage and rubber damage will cause the entire electrode system to be scrapped;

[0004] The rubber electrode system is very susceptible to corrosion by hydrogen sulfide gas, and has poor insulation performance in ultra-deep wells and high-salinity wells, so the logging data obtained cannot truly reflect the formation information; the dual lateral electrode system using fiberglass as the insulating sleeve is damaged and the insulation performance is reduced due to long-term erosion by high-temperature and high-pressure mud; some electrode systems using polyetheretherketone as the insulating sleeve have unreasonable structures, resulting in oil leakage from the electrode system and shortening of the insulating sleeve after logging in high-temperature wells, causing damage to the electrode system; the electrode ring made of stainless steel will cause serious distortion of the dual lateral logging data due to the insulation effect caused by the passivation of the stainless steel surface and the polarization of the metal electrode. Utility Model Content

[0005] In view of this, the purpose of the utility model is to propose a high-temperature resistant, corrosion-resistant and high-strength dual lateral electrode system to solve the problem of being difficult to meet the logging requirements of high-temperature, high-pressure deep formations and complex well conditions.

[0006] Based on the above purpose, the utility model provides a high-temperature resistant, corrosion-resistant and high-strength double-lateral electrode system, including: an upper joint, a lower joint and a mandrel, wherein the upper joint and the lower joint are respectively located at the two ends of the mandrel, and the upper joint and the lower joint are used to connect and fix the two ends of the electrode system, and the other sides of the upper joint and the lower joint are threadedly installed with protective caps, and the two sides of the mandrel are also respectively sleeved with a core tube upper and a core tube lower;

[0007] Electrode parts, the electrode parts include a metal composite electrode ring installed on the core shaft, an insulating module, a main monitoring electrode and an auxiliary monitoring electrode, which are used to measure the formation resistivity. The metal composite electrode ring includes a pole ring A1, a pole ring M2~ and a pole ring A1~. The insulating module includes an insulating sleeve 1, an insulating sleeve 2, an insulating sleeve 3, an insulating sleeve 4, an insulating sleeve 5 and an insulating sleeve 6. The main monitoring electrode includes a pole ring M2, a pole ring M1, a pole ring A0, a pole ring M1~ and a pole ring A1*~. The auxiliary monitoring electrode includes a An insulating joint upper and an insulating joint lower, the other ends of the insulating joint upper and the insulating joint lower are respectively connected to an insulating tube upper and an insulating tube lower by threads, one end of the insulating tube upper is embedded in the interior of the upper joint, the insulating sleeve one, insulating sleeve two, insulating sleeve three, insulating sleeve four, insulating sleeve five and insulating sleeve six are respectively arranged between the pole ring A1, pole ring M2, pole ring M1, pole ring A0, pole ring M1~, pole ring M2~ and pole ring A1~, and the metal composite material electrode ring, the insulating module, the main monitoring electrode and the auxiliary monitoring electrode are fixed with positioning pins;

[0008] A pressure balance compensation mechanism is sleeved on one side under the insulating tube, and is used to adjust the internal pressure to prevent the electrode system from being damaged due to excessive internal pressure.

[0009] Preferably, three single-core plug joints are arranged on the upper end of the core shaft and connected to the core tube above; a wire groove is arranged on the pressure-bearing end of each insulating sleeve; a sealing plug terminal is arranged on one side of the single-core plug joint; the sealing plug terminal is connected to the corresponding electrode with the copper rod through a short wire; the three insulating sleeves are respectively connected to the pole ring A0, pole ring A1~ and pole ring A1*~ through a short wire and a copper rod; one end of the pole ring A0 is respectively connected to the pole ring A1 and pole ring A1* through a short wire; the pole ring A1~ and pole ring A1*~ are symmetrically connected to the pole ring A1 and pole ring A1*.

[0010] Preferably, two single-core plug joints are arranged at the lower end of the core shaft and connected to the core tube below, and a wire groove is arranged at the pressure-bearing end of each single-core plug joint, and a sealing plug terminal is also arranged on one side of the single-core plug joint, and two 500-ohm resistors are connected to the sealing plug terminals in the wire groove, and the other end of the resistor is connected to the pole ring M1, pole ring M1~, pole ring M2 and pole ring M2~ by a soft wire, and the pole ring M1 and pole ring M1~ are symmetrically connected to the pole ring M2 and pole ring M2~.

[0011] Preferably, the main body material of the pole ring A0, pole ring A1 and pole ring A1~ is 17-4PH stainless steel, and the outer surface is coated with a composite oxide conductive layer.

[0012] Preferably, the insulating sleeve one, insulating sleeve two, insulating sleeve three, insulating sleeve four, insulating sleeve five and insulating sleeve six are all made of composite reinforced polyetheretherketone material, and the inner walls of the insulating sleeve one, insulating sleeve two, insulating sleeve three, insulating sleeve four, insulating sleeve five and insulating sleeve six are axially evenly distributed with a number of through holes and blind holes.

[0013] Preferably, the main monitoring electrode and the auxiliary monitoring electrode are both made of polyetheretherketone material, and the outer surfaces are both wrapped with lead wire as conductive electrodes. The main monitoring electrode is axially evenly distributed with through holes and blind holes. A groove is provided at the center of the outer surface of the thick-walled tube of the main monitoring electrode, and an outer groove is provided in the middle of one of the through holes on the main monitoring electrode on both sides, and the outer groove is connected to the groove. Blind holes are evenly distributed axially on one end of the auxiliary monitoring electrode, and the other end is set as an external thread.

[0014] Preferably, a conductive copper tube is installed in the through hole of the main monitoring electrode, and sealing rings are installed at both ends of the conductive copper tube to seal the through hole. Lead wire is wrapped around the insulating sleeve one, insulating sleeve two, insulating sleeve three, insulating sleeve four, insulating sleeve five and insulating sleeve six, and the lead wire is connected to the conductive copper tube by soldering.

[0015] Preferably, several of the positioning pins respectively pass through the metal composite material electrode ring and are fixedly connected to the blind holes of the insulating sleeve one, the insulating sleeve two, the insulating sleeve three, the insulating sleeve four, the insulating sleeve five and the insulating sleeve six.

[0016] Preferably, the pressure balancing and compensation mechanism includes a pressure balancing joint, a piston, a piston housing and a compression spring. One end of the pressure balancing joint is set as an inner sealing surface and an inner thread, and the other end is set as an outer sealing surface and an outer thread. The outer sealing surface at one end of the pressure balancing joint is sealed with the piston housing. The pressure balancing joint, the piston housing and the piston cooperate to form a sealed cavity. The outer surface of the piston is sleeved with a compression spring. The piston is pushed by the compression spring for pressure compensation. The inner thread of the pressure balancing joint is threadedly connected to the core tube below.

[0017] Preferably, an oil storage cavity is provided between the outside of the core shaft and the electrode part, the internal space of the oil storage cavity is filled with silicone oil, the oil storage cavity is connected to the pressure balance compensation mechanism, and a pressure relief valve is provided at the connection position between the upper joint and the oil storage cavity.

[0018] Beneficial effects of the utility model:

[0019] 1. This high-temperature-resistant, corrosion-resistant, high-strength dual-lateral electrode system adopts modular independent design for various electrodes and various insulating sleeves, avoiding mutual interference between electrodes, facilitating disassembly and maintenance, and effectively extending the overall service life of the electrode system. The metal composite electrode ring uses 17-4PH stainless steel as the base material, and the outer surface is composited with conductive oxides. While ensuring the high-strength and corrosion-resistant electrode ring, it eliminates the influence of downhole electrochemical reactions on the electrode potential, providing the necessary conditions for obtaining true and reliable formation resistivity.

[0020] 2. This high-temperature, corrosion-resistant and high-strength dual lateral electrode system can automatically adjust under high-temperature and high-pressure wells and complex well logging conditions by reserving gaps between metal and non-metal materials in the length direction; in the hydraulic balance system, pressure control elements and specially designed dynamic sealing structures are used to reliably seal the gaps between metal and non-metal materials; the characteristics of polyetheretherether copper materials such as high structural strength, strong corrosion resistance and excellent insulation properties are fully utilized to avoid damage to the dual lateral electrode system caused by high-temperature well logging and hydrogen sulfide gas logging, and can meet the logging requirements of various complex well conditions, with wide adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the planar structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the upper joint position structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the lower joint position structure of the utility model;

[0025] Figure 4 It is a schematic diagram of the electrode of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the monitoring electrode parts of the utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the insulation tube of the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the electrode ring and the insulating sleeve of the utility model;

[0029] Figure 8This is a schematic diagram of the structure of a single-core plug connector of the utility model.

[0030] The markings in the figure are:

[0031] 1. Protective cap; 2. Upper joint; 3. On core tube; 4. On insulating cylinder; 5. Pole ring A1*; 6. On insulating joint; 7. On single-core plug joint; 8. Pole ring A1; 9. Insulating sleeve 1; 10. Core shaft; 11. Pole ring M2; 12. Insulating sleeve 2; 13. Pole ring M1; 14. Insulating sleeve 3; 15. Pole ring A0; 16. Insulating sleeve 4; 17. Pole ring M1~; 18. Insulating sleeve 5; 19. Pole ring M2~; 20. Insulating sleeve 6; 21. Pole ring A1~; 22. Under insulating joint; 23. Under single-core plug joint; 24. Under insulating cylinder; 25. Under core tube; 26. Pressure relief valve; 27. Piston rod; 28. Piston; 29. ​​Compression spring; 30. Lower joint; 31. Groove; 32. Outer groove; 33. Conductive copper tube; 34. Sealing sleeve. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0033] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0034] like Figures 1 to 8As shown, a high-temperature resistant, corrosion-resistant and high-strength double-lateral electrode system comprises: an upper joint 2, a lower joint 30 and a core shaft 10, wherein the upper joint 2 and the lower joint 30 are respectively located at the two ends of the core shaft 10, and the upper joint 2 and the lower joint 30 are used to connect and fix the two ends of the electrode system, and the other sides of the upper joint 2 and the lower joint 30 are threadedly installed with a protective cap 1, and the two sides of the core shaft 10 are also respectively sleeved with a core tube upper 3 and a core tube lower 25; electrode parts, the electrode parts include a metal composite material electrode ring installed on the core shaft 10, an insulating module, a main monitoring electrode and an auxiliary monitoring electrode, which are used to measure the formation resistivity, the metal composite material electrode ring includes a pole ring A18, pole rings M2~19 and pole rings A1~21, the insulating module includes an insulating sleeve 19, an insulating sleeve 212, an insulating sleeve 314, an insulating sleeve 416, an insulating sleeve 518 and an insulating sleeve 620, the main monitoring electrode includes a pole ring M211, a pole ring M113, a pole ring A015, a pole ring M11 ~17 and pole ring A1*~, the auxiliary monitoring electrode includes an insulating joint upper 6 and an insulating joint lower 22 located at both ends of the main monitoring electrode, the other ends of the insulating joint upper 6 and the insulating joint lower 22 are respectively connected with an insulating tube upper 4 and an insulating tube lower 24 through threads, one end of the insulating tube upper 4 is embedded in the interior of the upper joint 2, and an insulating sleeve 1 9, an insulating sleeve 2 12, an insulating sleeve 3 14, an insulating sleeve 4 16, an insulating sleeve 5 18 and an insulating sleeve 6 20 are respectively arranged between the pole ring A18, the pole ring M211, the pole ring M113, the pole ring A015, the pole ring M1~17, the pole ring M2~19 and the pole ring A1~21, and the metal composite material electrode ring, the insulating module, the main monitoring electrode and the auxiliary monitoring electrode are fixed with positioning pins; a pressure balance compensation mechanism, the pressure balance compensation mechanism is sleeved on one side of the insulating tube lower 24, and the pressure balance compensation mechanism is used to adjust the internal pressure to prevent the electrode system from being damaged due to excessive internal pressure;

[0035] The electrode system is installed on the logging instrument and fixed to both ends of the instrument through the upper joint 2 and the lower joint 30, and the interface is protected by the protective cap 1. When the instrument enters the downhole operating environment, the core shaft 10 is connected through the core tube upper 3 and the core tube lower 25 to ensure the overall rigidity and stability of the system. The main monitoring electrode and the auxiliary monitoring electrode begin to measure the formation resistivity. The electrode rings (pole ring A18, pole ring M211, pole ring M113, pole ring A015, pole ring M1~17, pole ring M2~19 and pole ring A1~21) are installed on the core shaft 10. The pole rings are connected by insulating modules (insulating sleeve one 9, insulating sleeve two 12, insulating sleeve three 14, insulating sleeve four 16, insulating sleeve five 18, insulating sleeve five 19, insulating sleeve six 20, insulating sleeve seven 21, insulating sleeve eight 22, insulating sleeve eight 23, insulating sleeve eight 24, insulating sleeve eight 25, insulating sleeve eight 26, insulating sleeve eight 27, insulating sleeve eight 28, insulating sleeve eight 29, insulating sleeve eight 30, insulating sleeve eight 31, insulating sleeve eight 32, insulating sleeve eight 33, insulating sleeve eight 34, insulating sleeve eight 35, insulating sleeve eight 36, insulating sleeve eight 37, insulating sleeve eight 38, insulating sleeve eight 39, insulating sleeve eight 30, insulating sleeve eight 31, insulating sleeve eight 32, insulating sleeve eight 34, insulating sleeve eight 35, insulating sleeve eight 36, insulating sleeve eight 37, insulating sleeve eight 38, insulating sleeve eight 39, insulating sleeve eight 31, insulating sleeve eight 32, insulating sleeve eight 3 ... Set six 20) isolation to ensure the independence and accuracy of the signal. Each electrode ring and the insulating module are fixed by a positioning pin to ensure its stability in a high-pressure environment. When the logging instrument enters the formation, the internal silicone oil adjusts the pressure through the pressure balance compensation mechanism to prevent the internal pressure from being too high and damaging the electrode system. During the measurement process, the resistivity signal collected by the electrode ring is transmitted to the upper connector 2 and the lower connector 30 through the insulating tube upper 4 and the insulating tube lower 24, and finally transmitted to the ground control center through the logging instrument. After the measurement is completed, the electrode system is recovered from the well together with the logging instrument. The maintenance personnel can replace or maintain each electrode ring and insulating module as needed to ensure the performance when used next time.

[0036] like Figure 2 , Figure 3 , Figure 4 , Figure 7 As shown, three single-core plug connectors 7 are arranged on the upper end of the core shaft 10, and are connected to the core tube 3 above. A wire groove is arranged on the pressure-bearing end of each insulating sleeve 9, and a sealing plug terminal is arranged on one side of the single-core plug connector 7. The sealing plug terminal is connected to the corresponding electrode with the copper rod through a short wire. The three insulating sleeves 9 are respectively connected to the pole ring A015, the pole ring A1~21 and the pole ring A1*~ through the short wire and the copper rod. One end of the pole ring A015 is respectively connected to the pole ring A18 and the pole ring A1*5 through a short wire, and the pole ring A1~21 and the pole ring A1*~ are connected to the pole ring A18 and the pole ring Ring A1*5 is connected symmetrically, two single-core plug connectors 23 are arranged at the lower end of the core shaft 10, and connected to the core tube 25 below, each pressure-bearing end of the single-core plug connector 23 is provided with a wire groove, and one side of the single-core plug connector 23 is also provided with a sealing plug terminal, and the sealing plug terminal is connected to two 500 ohm resistors in the wire groove, and the other end of the resistor is connected to the pole ring M113, the pole ring M1~17, the pole ring M211 and the pole ring M2~19 by a soft wire, and the pole ring M113 and the pole ring M1~17 are symmetrically connected to the pole ring M211 and the pole ring M2~19;

[0037] The short wire connection between the single-core plug connector and the sealing plug terminal, copper rod, and pole ring ensures the electrical connection of the electrode system to be stable, reduces the resistance at the connection, and ensures the reliability of signal transmission. By setting the resistor in the wire slot, the electromagnetic interference can be effectively filtered to ensure the accuracy of the measurement signal. Each electrode ring and the insulating sleeve are connected by a short wire and a positioning pin, which is convenient for disassembly and replacement, reducing the maintenance cost. The symmetrical connection design ensures the balance of the electrode system, reduces the error, and improves the measurement accuracy. The electrodes are independent of each other, centered on the middle main electrode, and symmetrically distributed up and down. The insulating sleeve is installed in the inner hole of the metal composite material electrode, and each electrode is connected to the pressure-bearing sealing plug on the core shaft through a connecting wire; the symmetrical electrode rings are connected by wires, and the monitoring circuit obtains the formation voltage difference by measuring the pole ring M113 and M211 electrodes and the A1*5 and G electrodes. The deep and shallow lateral dynamic electric field distribution is changed through the subsequent circuit to achieve formation detection at different depths.

[0038] The main body material of the pole ring A015, pole ring A18 and pole ring A1~21 is made of 17-4PH stainless steel, and the outer surface is coated with a composite oxide conductive layer;

[0039] 17-4PH stainless steel is a material known for its excellent mechanical strength and corrosion resistance. It is particularly suitable for harsh downhole environments. It can maintain structural integrity in high temperature, high pressure and corrosive fluids, ensuring the long life and reliability of the electrode system. In high temperature and high pressure environments such as oil and gas wells and geothermal wells, the corrosion resistance of the material is crucial because corrosive fluids often exist in downhole environments. By coating a composite oxide conductive layer on the surface of stainless steel, the conductivity of the electrode can be significantly improved. The composite oxide material has good conductivity and wear resistance, which can ensure that the electrode transmits high-quality electrical signals during the measurement process.

[0040] like Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the insulating sleeve 1 9, the insulating sleeve 2 12, the insulating sleeve 3 14, the insulating sleeve 4 16, the insulating sleeve 5 18 and the insulating sleeve 6 20 are all made of composite reinforced polyetheretherketone material, and the inner walls of the insulating sleeve 1 9, the insulating sleeve 2 12, the insulating sleeve 3 14, the insulating sleeve 4 16, the insulating sleeve 5 18 and the insulating sleeve 6 20 are axially evenly distributed with a number of through holes and blind holes, the main monitoring electrode and the auxiliary monitoring electrode are made of polyetheretherketone material, and the outer surfaces are all wrapped with lead wire as conductive electrodes, the through holes and blind holes are axially evenly distributed on the main monitoring electrode, a groove 31 is opened at the center of the outer surface of the thick-walled tube of the main monitoring electrode, and an outer groove 32 is opened on both sides from the middle of one of the through holes on the main monitoring electrode, and the outer groove 32 is connected to the groove 31, and one end of the auxiliary monitoring electrode is axially evenly distributed with blind holes, and the other end is set as an external thread;

[0041] The composite reinforced polyetheretherketone material has excellent mechanical properties, high temperature resistance and chemical stability, and can maintain stable performance in harsh environments and extend the service life of the electrode system. The through holes and blind holes are evenly distributed on the inner wall of the insulating sleeve, which helps to reduce the weight of the material, increase the heat dissipation area, improve the insulation performance, and reduce the impact of thermal expansion on the system. The design of the through holes and blind holes can effectively reduce electromagnetic interference and ensure the purity and stability of the measurement signal.

[0042] A conductive copper tube 33 is installed in the through hole of the main monitoring electrode, and sealing rings 34 are installed at both ends of the conductive copper tube 33 to seal the through hole. Lead wire is wound around the insulating sleeve 1 9, the insulating sleeve 2 12, the insulating sleeve 3 14, the insulating sleeve 4 16, the insulating sleeve 5 18 and the insulating sleeve 6 20, and the lead wire is connected to the conductive copper tube by soldering;

[0043] The excellent conductivity of the conductive copper tube 33 significantly improves the conductive performance of the electrode, ensures the high efficiency and stability of the electrical signal transmission, and ensures the stable electrical connection between the lead wire and the conductive copper tube 33 through soldering, reducing the resistance; improves the sealing performance, the sealing ring effectively prevents external liquid or gas from entering the conductive system, ensures the reliability of the electrode system in harsh environments, and prevents corrosive fluids from entering the electrode, extending the service life, and the use of the sealing ring effectively isolates external electromagnetic interference, ensures the purity and stability of the measurement signal, and improves the reliability of the measurement; simplifies maintenance and replacement, the modular design makes it easy to disassemble and replace each part, simplifies the maintenance process, reduces downtime, and improves work efficiency;

[0044] A plurality of positioning pins respectively pass through the metal composite material electrode ring and are fixedly connected in the blind holes of the insulating sleeve 1 9, the insulating sleeve 2 12, the insulating sleeve 3 14, the insulating sleeve 4 16, the insulating sleeve 5 18 and the insulating sleeve 6 20;

[0045] The positioning pin passes through the metal composite electrode ring and is fixed in the blind hole of the insulation module, ensuring that the various parts can still be tightly connected under high pressure and high temperature environment, preventing loosening and displacement, and improving the overall mechanical strength and durability of the system.

[0046] like Figures 1 to 3 As shown, the pressure balance compensation mechanism includes a pressure balance joint, a piston 28, a piston shell and a compression spring 29. One end of the pressure balance joint is set as an inner sealing surface and an inner thread, and the other end is set as an outer sealing surface and an outer thread. The outer sealing surface of one end of the pressure balance joint is matched with the outer shell of the piston 28 for sealing. The pressure balance joint, the piston shell and the piston 28 cooperate to form a sealed cavity. The outer surface of the piston 28 is sleeved with a compression spring 29. The piston 28 is pushed by the compression spring 29 to perform pressure compensation. The inner thread of the pressure balance joint is threadedly connected with the core tube below.

[0047] The sealed cavity formed by the pressure balance joint, the piston 28 shell and the piston 28 can automatically compensate for the changes in internal and external pressures through the movement of the piston 28, thereby maintaining the internal pressure of the electrode system stable and preventing system damage caused by excessive pressure. At the same time, the cooperation between the internal and external sealing surfaces of the pressure balance joint and the piston 28 shell and the core tube thread ensures the airtightness of the sealed cavity, preventing external fluid from entering the system, and enhancing the durability and reliability of the system.

[0048] An oil storage cavity is provided between the outside of the mandrel 10 and the electrode part. The internal space of the oil storage cavity is filled with silicone oil. The oil storage cavity is connected to the pressure balance compensation mechanism. A pressure relief valve 26 is provided at the connection position between the upper joint 2 and the oil storage cavity.

[0049] Silicone oil as a filling medium not only has excellent lubricating properties, but also can effectively buffer and absorb the vibration and impact generated by mechanical parts during operation, reducing wear. At the same time, the design of the oil storage cavity can balance the pressure changes inside the system and prevent failures caused by pressure fluctuations. By setting a pressure relief valve 26, it can ensure that excess pressure is released in time when the pressure is too high, further protecting the system from overload, thereby extending the service life of the equipment and improving overall work efficiency.

[0050] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0051] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-temperature-resistant, corrosion-resistant and high-strength double-lateral electrode system, characterized in that: include: An upper joint (2), a lower joint (30) and a core shaft (10), wherein the upper joint (2) and the lower joint (30) are respectively located at two ends of the core shaft (10), and the upper joint (2) and the lower joint (30) are used to connect and fix two ends of the electrode system, and the other sides of the upper joint (2) and the lower joint (30) are both threadedly mounted with protective caps (1), and the two sides of the core shaft (10) are also respectively sleeved with an upper core tube (3) and a lower core tube (25); An electrode part, the electrode part comprising a metal composite material electrode ring mounted on the core shaft (10), an insulating module, a main monitoring electrode and an auxiliary monitoring electrode, for measuring formation resistivity, the metal composite material electrode ring comprising a pole ring A1 (8), a pole ring M2~ (19) and a pole ring A1~ (21), the insulating module comprising an insulating sleeve one (9), an insulating sleeve two (12), an insulating sleeve three (14), an insulating sleeve four (16), an insulating sleeve five (18) and an insulating sleeve six (20), the main monitoring electrode comprising a pole ring M2 (11), a pole ring M1 (13), a pole ring A0 (15), a pole ring M1~ (17) and a pole ring A1*~, the auxiliary monitoring electrode comprising an insulating joint (6) located at both ends of the main monitoring electrode and connected to the insulating joint The upper end of the insulating joint (6) and the lower end of the insulating joint (22) are respectively connected to the upper insulating tube (4) and the lower insulating tube (24) by threads, one end of the upper insulating tube (4) is embedded in the interior of the upper joint (2), the insulating sleeve one (9), the insulating sleeve two (12), the insulating sleeve three (14), the insulating sleeve four (16), the insulating sleeve five (18) and the insulating sleeve six (20) are respectively arranged between the pole ring A1 (8), the pole ring M2 (11), the pole ring M1 (13), the pole ring A0 (15), the pole ring M1~ (17), the pole ring M2~ (19) and the pole ring A1~ (21), and the metal composite material electrode ring, the insulating module, the main monitoring electrode and the auxiliary monitoring electrode are fixed by positioning pins; A pressure balance compensation mechanism is sleeved on one side of the lower portion (24) of the insulating tube, and is used to adjust the internal pressure to prevent the electrode system from being damaged due to excessive internal pressure.

2. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: Three single-core plug connectors (7) are arranged at the upper end of the core shaft (10) and connected to the core tube (3) above. A wire groove is arranged at the pressure-bearing end of each insulating sleeve (9). A sealing plug terminal is arranged on one side of the single-core plug connector (7). The sealing plug terminal is connected to the corresponding electrode through a short wire and a copper rod. The three insulating sleeves (9) are respectively plugged with the pole ring A0 (15), pole ring A1~ (21) and pole ring A1*~ through short wires and copper rods. One end of the pole ring A0 (15) is respectively connected to the pole ring A1 (8) and pole ring A1* (5) through a short wire. The pole ring A1~ (21) and pole ring A1*~ are symmetrically connected to the pole ring A1 (8) and pole ring A1* (5).

3. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: Two single-core plug connectors (23) are arranged at the lower end of the core shaft (10) and connected to the core tube (25) below. The pressure-bearing end of each single-core plug connector (23) is provided with a wire groove, and a sealing plug terminal is also arranged on one side of the single-core plug connector (23). The sealing plug terminal is connected to two 500 ohm resistors in the wire groove, and the other end of the resistor is connected to the pole ring M1 (13), the pole ring M1~(17), the pole ring M2 (11) and the pole ring M2~(19) by a soft wire. The pole ring M1 (13) and the pole ring M1~(17) are symmetrically connected to the pole ring M2 (11) and the pole ring M2~(19).

4. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: The main body material of the pole ring A0 (15), pole ring A1 (8) and pole ring A1~ (21) is 17-4PH stainless steel, and the outer surface is coated with a composite oxide conductive layer.

5. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: The insulating sleeve one (9), the insulating sleeve two (12), the insulating sleeve three (14), the insulating sleeve four (16), the insulating sleeve five (18) and the insulating sleeve six (20) are all made of composite reinforced polyetheretherketone material, and the inner walls of the insulating sleeve one (9), the insulating sleeve two (12), the insulating sleeve three (14), the insulating sleeve four (16), the insulating sleeve five (18) and the insulating sleeve six (20) are axially evenly distributed with a plurality of through holes and blind holes.

6. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: The main monitoring electrode and the auxiliary monitoring electrode are both made of polyetheretherketone material, and the outer surfaces of both are wound with lead wire as conductive electrodes. The main monitoring electrode has through holes and blind holes evenly distributed in the axial direction. A groove (31) is provided at the center of the outer surface of the thick-walled tube of the main monitoring electrode, and an outer groove (32) is provided in the middle of one of the through holes on the main monitoring electrode to both sides. The outer groove (32) is connected to the groove (31). One end of the auxiliary monitoring electrode has blind holes evenly distributed in the axial direction, and the other end is provided with an external thread.

7. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: A conductive copper tube (33) is installed in the through hole of the main monitoring electrode, and sealing rings (34) are installed at both ends of the conductive copper tube (33) to seal the through hole. Lead wires are wound around the insulating sleeve one (9), the insulating sleeve two (12), the insulating sleeve three (14), the insulating sleeve four (16), the insulating sleeve five (18) and the insulating sleeve six (20), and the lead wires are connected to the conductive copper tube by soldering.

8. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: The plurality of positioning pins respectively pass through the metal composite material electrode ring and are fixedly connected to the blind holes of the insulating sleeve one (9), the insulating sleeve two (12), the insulating sleeve three (14), the insulating sleeve four (16), the insulating sleeve five (18) and the insulating sleeve six (20).

9. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: The pressure balance compensation mechanism comprises a pressure balance joint, a piston (28), a piston shell and a compression spring (29); one end of the pressure balance joint is provided with an inner sealing surface and an inner thread, and the other end is provided with an outer sealing surface and an outer thread; the outer sealing surface at one end of the pressure balance joint is matched with the piston (28) shell for sealing; the pressure balance joint, the piston shell and the piston (28) cooperate to form a sealed cavity; the outer surface of the piston (28) is sleeved with a compression spring (29); the piston (28) is pushed by the compression spring (29) to perform pressure compensation; the inner thread of the pressure balance joint is threadedly connected to the core tube below.

10. The high temperature resistant, corrosion resistant and high strength double lateral electrode system according to claim 1, characterized in that: An oil storage cavity is provided between the outside of the core shaft (10) and the electrode part, the internal space of the oil storage cavity is filled with silicone oil, the oil storage cavity is connected to the pressure balance compensation mechanism, and a pressure relief valve (26) is provided at the connection position between the upper joint (2) and the oil storage cavity.

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