Insulation sealing lateral electrode structure with balanced internal and external pressure and assembling method

Abstract

The invention relates to the field of petroleum logging, and discloses an insulation sealing lateral electrode structure with balanced internal and external pressure and an assembling method.An electrode set and a piston balance assembly are coaxially connected and are of a circumferential sealing structure, and the two ends of a mandrel are sleeved with an upper insulation sleeve and a lower insulation sleeve respectively; the middle of the mandrel is sleeved with an electrode insulation assembly, the insulation performance between the electrodes and between the electrodes and other metal parts at the high temperature is guaranteed, one end of an oil passing channel is inserted into the mandrel and communicates with an oil cavity of the mandrel, and the other end of the oil passing channel is inserted into an assembly hole of a lower adapter and communicates with an oil cavity in a piston assembly; a silicone oil runner is designed among the lower end of the mandrel, the lower adapter and the lower shell, silicone oil is led into the lower shell, and a piston, a piston shaft and a lower plug are mounted in the lower shell; and internal and external pressure balance of the instrument is realized through movement of the piston in the lower shell.

Description

Technical Field

[0001] The invention relates to the field of petroleum well logging, in particular to an insulating sealed lateral electrode structure with balanced internal and external pressures and an assembly method. Background Art

[0002] Oil and gas resources are very important energy sources in the process of social and economic development. At present, the exploitation of many oil and gas fields in my country has reached the late development stage, the growth rate of oil exploitation has slowed down, and the difficulty of exploitation has continued to increase. The increase in the difficulty of exploitation is mainly reflected in the increase in the depth of the oil well. With the increase in the depth of the oil well, the temperature and pressure indicators of the well logging also continue to increase. In order to improve the efficiency of oil and gas resource exploitation in my country, higher requirements are also put forward for the use indicators of well logging instruments.

[0003] At present, the insulation performance of the dual lateral instrument is reduced under high temperature, and the static pressure resistance of the instrument is also reduced. The internal and external pressures of the instrument cannot be balanced under high temperature and high pressure, resulting in a decrease in logging work efficiency. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide an insulating sealed lateral electrode structure and an assembly method with balanced internal and external pressures, so as to solve the technical problems in the prior art that the insulation performance of the double lateral instrument at high temperature is reduced, the static pressure resistance of the instrument is also reduced, and the internal and external pressures of the instrument cannot be balanced under high temperature and high pressure.

[0005] The present invention is achieved through the following technical solutions:

[0006] An insulating sealed lateral electrode structure with balanced internal and external pressures, comprising a coaxially connected electrode group and a piston balancing assembly; an oil passage is arranged between the electrode group and the piston balancing assembly; the electrode group comprises a mandrel, a mandrel fixed connection assembly, an insulating upper sleeve, an electrode insulating assembly, an insulating lower sleeve, and a mandrel support and clamping assembly; the piston balancing assembly comprises a lower adapter, a piston assembly and a lower plug; the mandrel fixed connection assembly is fixedly arranged at one end of the mandrel, the insulating upper sleeve, the electrode insulating assembly and the insulating lower sleeve are sequentially inserted into the mandrel, wherein the insulating upper sleeve is sealedly connected to the mandrel fixed connection assembly, the electrode insulating assembly is sealedly connected to the insulating upper sleeve, and the insulating lower sleeve is sealedly connected to the electrode insulating assembly; the mandrel support and clamping assembly clamping sleeve is arranged at the other end of the mandrel; the assembly hole at one end of the lower adapter is inserted into the end of the mandrel and abuts against the mandrel support and clamping assembly; the other end of the lower adapter is inserted into the piston assembly, and the lower plug is assembled on the piston assembly; one end of the oil passage is inserted into the mandrel and communicated with the oil cavity of the mandrel, and the other end is inserted into the assembly hole of the lower adapter and communicated with the oil cavity in the piston assembly.

[0007] Preferably, the electrode insulation assembly comprises a plurality of electrodes and an insulating block; the plurality of electrodes and the insulating blocks are alternately inserted into the core shaft in sequence, the structure of the electrode is an annular structure, wherein bosses with the same structure are provided on both sides of the electrode, wherein the outer diameter of the bosses on both sides of the electrode is smaller than the outer diameter of the electrode, and grooves are provided on the bosses on both sides of the middle electrode for sleeve-mounting the first sealing ring; the structure of the insulating block is an annular structure, wherein concave platforms with the same structure are provided on both sides of the insulating block, the concave platforms on both sides of the insulating block are assembled with the bosses of the electrodes adjacent to the left and right of the insulating block, and a first sealing ring is provided for sealing between the concave platforms and the bosses.

[0008] Preferably, the core shaft fixed connection assembly includes a core shaft head, a threaded half ring and a metal upper sleeve; the core shaft head is sealed and connected to the core shaft through a thread and a sixth sealing ring, and the metal upper sleeve is arranged on the core shaft, wherein one end of the metal upper sleeve is sealed and connected to the core shaft head, and the other side is sealed and connected to the insulating upper sleeve, and the threaded half ring is arranged on the core shaft head for matching with the interface.

[0009] Preferably, the clamping assembly at the end of the core shaft includes an electrode support sleeve and a clamping nut, wherein the electrode support sleeve is sleeved on the core shaft and is sealingly connected to the end of the insulating lower sleeve; the clamping nut is sleeved on the core shaft and clamped on the electrode support sleeve, the end of the assembly hole of the lower adapter abuts against the clamping nut, and a plurality of seventh sealing rings are sleeved on the end of the core shaft and the assembly holes of the electrode support sleeve and the lower adapter.

[0010] Preferably, the outer surface of the core shaft is covered with a core shaft insulating sleeve, and a gap is formed between the core shaft insulating sleeve and the insulating upper sleeve, the electrode insulating assembly and the insulating lower sleeve to form a first oil chamber, and the core shaft has a first oil hole at the end of the first oil chamber for connecting the first oil chamber to the oil passage through the first oil hole.

[0011] Furthermore, the oil passage includes an oil passage rod, one end of the oil passage rod is inserted into the inner hole of the core shaft, and the other end is inserted into the assembly hole of the lower adapter, and third sealing rings are respectively sleeved between the outer walls of the two ends of the oil passage rod and the inner wall of the inner hole of the core shaft and the assembly hole of the adapter; there is a gap between the middle outer wall of the oil passage rod and the inner wall of the core shaft to form a second oil chamber; a second oil passage hole is provided on the lower adapter; one end of the second oil chamber is connected to the first oil chamber through the first oil passage hole, and the other end is connected to the oil chamber of the piston assembly through the second oil passage hole.

[0012] Furthermore, the piston assembly includes a lower outer shell, a piston shaft and a piston, the end of the lower outer shell is assembled on the lower adapter, the lower plug is assembled on the lower outer shell, and a second sealing ring is arranged between the lower plug and the lower outer shell; the piston is arranged in the lower outer shell, wherein a fourth sealing ring is sleeved between the outer circle of the piston and the lower outer shell, the piston shaft is arranged in the lower outer shell, wherein one end of the piston shaft is inserted into the end of the lower adapter, and an eighth sealing ring is sleeved between the end of the lower adapter, the other end of the piston shaft is inserted into the lower plug through the piston, and a fifth sealing ring is sleeved between the piston shaft and the inner circle of the piston, and a ninth sealing ring is sleeved between the piston shaft and the lower plug; a third oil chamber is formed between the lower adapter, the piston shaft and the piston, and the third oil chamber is connected to the second oil hole.

[0013] Furthermore, a piston support sleeve is arranged between the piston shaft and the piston to limit the position of the piston.

[0014] Furthermore, the outer surfaces of the core shaft end clamping assembly and the lower adapter are covered with a first insulating sleeve, and the outer surface of the lower shell is covered with a second insulating sleeve, and the first insulating sleeve and the second insulating sleeve are sealed and connected.

[0015] An assembly method of an insulating sealed lateral electrode structure with balanced internal and external pressures, based on the insulating sealed lateral electrode structure with balanced internal and external pressures, includes the following processes:

[0016] The core shaft fixing connection assembly is fixedly set at one end of the core shaft, and the insulating upper sleeve, the electrode insulating assembly and the insulating lower sleeve are sequentially sleeved into the core shaft, wherein the insulating upper sleeve is sealedly connected to the core shaft fixing connection assembly, the electrode insulating assembly is sealedly connected to the insulating upper sleeve, and the insulating lower sleeve is sealedly connected to the electrode insulating assembly; the core shaft support clamping assembly clamping sleeve is arranged at one end of the core shaft lower adapter assembly hole and inserted into the core shaft end, and abuts against the core shaft support clamping assembly; the other end of the lower adapter is inserted into the piston assembly, and the lower plug is assembled on the piston assembly, the outer surface of the core shaft is covered with the core shaft insulating sleeve, and the two ends of the core shaft are respectively sleeved with the insulating upper sleeve and the insulating lower sleeve; the electrode insulating assembly is sealed to achieve the insulation performance between the electrodes and between the electrodes and the other metal parts under high temperature, and a silicone oil flow channel is designed between the lower end of the core shaft, the lower adapter and the lower shell, and the silicone oil is led to the lower shell, and the lower shell is installed with a piston, a piston shaft and a lower plug; the pressure balance inside and outside the instrument is achieved by the movement of the piston in the lower shell.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] The present invention provides an insulating sealed lateral electrode structure with balanced internal and external pressures. The structure is coaxially connected through an electrode group and a piston balancing assembly. The electrode group and the piston balancing assembly are circumferentially sealed structures. An insulating upper sleeve and an insulating lower sleeve are respectively inserted into the two ends of a core shaft, and an electrode insulating assembly is inserted into the middle of the core shaft to ensure the insulation performance between electrodes and between electrodes and other metal parts at high temperatures. One end of an oil passage is inserted into the core shaft and communicated with the oil cavity of the core shaft, and the other end is inserted into the assembly hole of a lower adapter and communicated with the oil cavity in the piston assembly. A silicone oil flow channel is designed between the lower end of the core shaft, the lower adapter and the lower shell body to lead the silicone oil into the lower shell body. A piston, a piston shaft and a lower plug are installed in the lower shell body. The internal and external pressures of the instrument are balanced by the movement of the piston in the lower shell body.

[0019] Furthermore, bosses of the same size are designed at both ends of the annular electrode, and the outer diameter of the boss is smaller than the outer diameter of the electrode; a groove is designed on the circumferential surface of the boss at both ends, and an O-ring is installed in the groove; concave platforms of the same size are designed at both ends of the annular electrode insulating block, the outer diameter of the electrode insulating block is the same as the outer diameter of the electrode, and the concave platforms at both ends of the insulating block are the same size as the bosses at both ends of the electrode, thereby ensuring the insulation performance between electrodes and between electrodes and other metal parts at high temperatures.

[0020] Furthermore, the core shaft fixed connection assembly includes a core shaft head, a threaded half ring and a metal upper sleeve. The core shaft head is sealed to the core shaft through a thread and a sixth sealing ring. The metal upper sleeve is arranged on the core shaft, wherein one end of the metal upper sleeve is sealed to the core shaft head, and the other side is sealed to the insulating upper sleeve. The threaded half ring is arranged on the core shaft head to ensure the stability of the assembly of the core shaft end.

[0021] Furthermore, the clamping assembly at the end of the mandrel includes an electrode support sleeve and a clamping nut, so that the insulating upper sleeve, the electrode insulating assembly and the insulating lower sleeve inserted on the mandrel are pressed on the mandrel, ensuring the sealing of the electrode group.

[0022] Furthermore, the outer surface of the core shaft is covered with a core shaft insulating sleeve, and a gap exists between the core shaft insulating sleeve and the insulating upper sleeve, the electrode insulating assembly and the insulating lower sleeve to form a first oil chamber. The core shaft has a first oil hole at the end of the first oil chamber, which is used to connect the first oil chamber to the oil passage through the first oil hole, and then to the piston balance assembly through the oil passage, so as to achieve pressure balance inside and outside the instrument through the piston balance assembly.

[0023] Furthermore, a third sealing ring is sleeved between the outer walls of the two ends of the oil-passing rod and the inner walls of the inner hole of the core shaft and the assembly hole of the adapter respectively; there is a gap between the middle outer wall of the oil-passing rod and the inner wall of the core shaft to form a second oil chamber; a second oil-passing hole is provided on the lower adapter; one end of the second oil chamber is connected to the first oil chamber through the first oil-passing hole, and the other end is connected to the oil chamber of the piston assembly through the second oil-passing hole. The oil-passing rod can connect the silicone oil in the electrode group with the silicone oil in the piston balancing assembly, and balance the internal and external pressures of the electrode group through the silicone oil in the piston balancing assembly.

[0024] Furthermore, a third oil chamber is formed between the lower adapter and the piston shaft and the piston, and the third oil chamber is connected to the second oil hole, and the oil chamber is connected to the oil chamber through the oil hole. There is a large amount of silicone oil in the oil chamber, accounting for 80% of the total oil volume, which can achieve balanced pressure adjustment inside and outside the instrument under high temperature and high pressure environment. At the same time, the large amount of oil can reduce the number of times the instrument is refilled, and multiple well logging can be achieved with one oil injection, greatly improving the efficiency of instrument use and logging.

[0025] The present invention also provides an assembly method for an insulating sealed lateral electrode structure with balanced internal and external pressures, wherein a core shaft fixed connection assembly is fixedly arranged at one end of the core shaft, and an insulating upper sleeve, an electrode insulating assembly and an insulating lower sleeve are sequentially inserted into the core shaft, wherein the insulating upper sleeve is sealedly connected to the core shaft fixed connection assembly, the electrode insulating assembly is sealedly connected to the insulating upper sleeve, and the insulating lower sleeve is sealedly connected to the electrode insulating assembly; the core shaft support clamping assembly clamping sleeve is arranged at one end of the core shaft lower adapter, and is inserted into the core shaft end portion through an assembly hole, and abuts against the core shaft support clamping assembly; the other end of the lower adapter is inserted into the piston assembly, and the lower plug is assembled on the piston assembly, the assembly is simple, and the electrode insulating assembly is sealed, so as to realize the insulation performance between electrodes and between electrodes and other metal parts at high temperature; a silicone oil flow channel is designed between the lower end of the core shaft, the lower adapter and the lower outer shell, and the silicone oil is led to the lower outer shell, in which a piston, a piston shaft and a lower plug are installed; the internal and external pressures of the instrument are balanced by the movement of the piston in the lower outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the lateral electrode in the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the electrode group and the oil passage in the present invention;

[0028] Figure 3 for Figure 2 A schematic diagram of the structure enlargement of part A;

[0029] Figure 4 for Figure 2 A schematic diagram of the structure of part B in the middle is enlarged;

[0030] Figure 5It is a schematic diagram of the structure of the piston balance assembly in the present invention;

[0031] Figure 6 Schematic diagram of the electrode structure in the present invention;

[0032] Figure 7 It is a cross-sectional view of the electrode in the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the insulating block in the present invention;

[0034] Fig. 9 It is a cross-sectional view of the insulating block in the present invention;

[0035] In the figure: 1-electrode group; 2-oil passage; 3-piston balance assembly; 11-mandrel; 12-mandrel head; 13-threaded half ring; 14-metal upper sleeve; 15-insulating upper sleeve; 16-mandrel insulating sleeve; 17-electrode; 18-insulating block; 19-insulating lower sleeve; 20-electrode support sleeve; 21-tightening nut; 22-first sealing ring; 23-lower adapter; 24-first insulating sleeve; 25-oil rod; 26-lower housing ;27-piston shaft;28-piston;29-piston support sleeve;30-lower plug;31-second insulating sleeve;32-second sealing ring;33-third sealing ring;34-fourth sealing ring;35-fifth sealing ring;36-sixth sealing ring;37-seventh sealing ring;38-eighth sealing ring;100-first oil chamber;101-first oil hole;102-second oil chamber;103-second oil hole;104-third oil chamber; DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0038] The purpose of the present invention is to provide an insulating sealed lateral electrode structure and an assembly method with balanced internal and external pressures, so as to solve the technical problems in the prior art that the insulation performance of double lateral instruments at high temperatures is reduced, the static pressure resistance of the instruments is also reduced, and the internal and external pressures of the instruments cannot be balanced under high temperature and high pressure.

[0039] See also Figure 1In one embodiment of the present invention, an insulating sealed lateral electrode structure with balanced internal and external pressure is provided, including a coaxially connected electrode group 1 and a piston balance assembly 3; an oil passage 2 is arranged between the electrode group 1 and the piston balance assembly 3; the electrode group 1 includes a mandrel 11, a mandrel fixed connection assembly, an insulating upper sleeve 15, an electrode insulating assembly, an insulating lower sleeve 19, and a mandrel support and clamping assembly; the piston balance assembly 3 includes a lower adapter 23, a piston assembly and a lower plug 30; the mandrel fixed connection assembly is fixedly arranged at one end of the mandrel 11, and the insulating upper sleeve 15, the electrode insulating assembly and the insulating lower sleeve 19 are sequentially inserted into the mandrel 11, wherein the insulating upper sleeve 15 is sealed and connected to the core shaft fixed connection assembly, the electrode insulating assembly is sealed and connected to the insulating upper sleeve 15, and the insulating lower sleeve 19 is sealed and connected to the electrode insulating assembly; the core shaft support clamping assembly clamping sleeve is arranged at the other end of the core shaft 11; the assembly hole at one end of the lower adapter 23 is inserted into the end of the core shaft 11, and abuts against the core shaft support clamping assembly; the other end of the lower adapter 23 is inserted into the piston assembly, and the lower plug 30 is assembled on the piston assembly; one end of the oil passage 2 is inserted into the core shaft 11 and communicated with the oil chamber of the core shaft 11, and the other end is inserted into the assembly hole of the lower adapter 23 and communicated with the oil chamber in the piston assembly.

[0040] Specifically, the electrode insulation assembly includes a plurality of electrodes 17 and an insulating block 18; the plurality of electrodes 17 and the insulating block 18 are alternately inserted into the core shaft 11 in sequence, the structure of the electrode 17 is an annular structure, wherein bosses with the same structure are provided on both sides of the electrode 17, wherein the outer diameter of the bosses on both sides of the electrode 17 is smaller than the outer diameter of the electrode 17, and grooves are provided on the bosses on both sides of the middle electrode 17 for sleeve-mounting the first sealing ring 22; the structure of the insulating block 18 is an annular structure, wherein concave platforms with the same structure are provided on both sides of the insulating block 18, the concave platforms on both sides of the insulating block 18 are assembled with the bosses of the electrodes 17 adjacent to the insulating block 18 on the left and right, and a first sealing ring 22 is provided for sealing between the concave platforms and the bosses.

[0041] The electrode 17 is a ring-shaped electrode with bosses of the same size at both ends, and the outer diameter of the bosses is smaller than the outer diameter of the electrode; a groove is designed on the circumferential surface of the bosses at both ends, and an O-ring is installed in the groove. Figure 6 and Figure 7 As shown; the insulating block 18 is a ring-shaped insulating block with concave platforms of the same size at both ends. The outer diameter of the electrode insulating block is the same as the outer diameter of the electrode. The concave platforms at both ends of the insulating block are the same size as the convex platforms at both ends of the electrode, such as Figure 8 and Fig. 9As shown. The outer surface of the mandrel 11 is provided with a mandrel insulating sleeve 16, which separates the electrode 17 from the mandrel 11, and realizes the insulation between the electrode 17 and the mandrel 11; the bosses at both ends of the electrode 17 are installed with the first sealing ring 22 in their sealing grooves, and then embedded in the concave platforms at both ends of the insulating block 18, so as to realize the insulation between the electrodes 17 and the sealed connection between the electrodes 17; the remaining parts mounted on the mandrel 11 are sealed and connected in the same way as above, thereby improving the sealing performance of the electrode group at high temperature.

[0042] Specifically, the core shaft fixed connection assembly includes a core shaft head 12, a threaded half ring 13 and a metal upper sleeve 14; the core shaft head 12 is sealed and connected to the core shaft 11 through a thread and a sixth sealing ring 36, and the metal upper sleeve 14 is sleeved on the core shaft 11, wherein one end of the metal upper sleeve 14 is sealed and connected to the core shaft head 12, and the other side is sealed and connected to the insulating upper sleeve 15, and the threaded half ring 13 is arranged on the core shaft head 12 for matching with the interface.

[0043] Specifically, the clamping assembly at the end of the core shaft includes an electrode support sleeve 20 and a clamping nut 21. The electrode support sleeve 20 is sleeved on the core shaft 11, and the electrode support sleeve 20 is sealed and connected to the end of the insulating lower sleeve 19; the clamping nut 21 is sleeved on the core shaft 11 and clamped on the electrode support sleeve 20, and the end of the assembly hole of the lower adapter 23 abuts against the clamping nut 21, and a number of seventh sealing rings 37 are sleeved in the end of the core shaft 11 and the assembly holes of the electrode support sleeve 20 and the lower adapter 23.

[0044] Specifically, the outer surface of the core shaft 11 is covered with a core shaft insulating sleeve 16, and a gap exists between the core shaft insulating sleeve 16 and the insulating upper sleeve 15, the electrode insulating assembly and the insulating lower sleeve 19 to form a first oil chamber 100. The core shaft 11 has a first oil hole 101 at the end of the first oil chamber 100, which is used to connect the first oil chamber 100 to the oil passage 2 through the first oil hole 101.

[0045] Among them, the oil passage 2 includes an oil passage rod 25, one end of the oil passage rod 25 is inserted into the inner hole of the core shaft 11, and the other end is inserted into the assembly hole of the lower adapter 23, and the outer walls of the two ends of the oil passage rod 25 are respectively sleeved with a third sealing ring 33 between the inner wall of the inner hole of the core shaft 11 and the inner wall of the assembly hole of the adapter 23; there is a gap between the middle outer wall of the oil passage rod 25 and the inner wall of the core shaft 11 to form a second oil chamber 102; a second oil passage hole 103 is provided on the lower adapter 23; one end of the second oil chamber 102 is connected to the first oil chamber 100 through the first oil passage hole 101, and the other end is connected to the oil chamber of the piston assembly through the second oil passage hole 103.

[0046] The piston assembly includes a lower housing 26, a piston shaft 27 and a piston 28, the end of the lower housing 26 is assembled on the lower adapter 23, the lower plug 30 is assembled on the lower housing 26, and a second sealing ring 32 is arranged between the lower plug 30 and the lower housing 26; the piston 28 is arranged in the lower housing 26, wherein a fourth sealing ring 34 is sleeved between the outer circle of the piston and the lower housing 26, the piston shaft 27 is arranged in the lower housing 26, wherein one end of the piston shaft 27 is inserted into the end of the lower adapter 23, and an eighth sealing ring 38 is sleeved between the end of the lower adapter 23, the other end of the piston shaft 27 is inserted into the lower plug 30 through the piston 28, and a fifth sealing ring 35 is sleeved between the inner circle of the piston shaft 27 and the piston 28, and a ninth sealing ring is sleeved between the piston shaft 27 and the lower plug 30; a third oil chamber 104 is formed between the lower adapter 23, the piston shaft 27 and the piston 28, and the third oil chamber 104 is connected to the second oil hole 103.

[0047] A piston support sleeve 29 is provided between the piston shaft 27 and the piston 28 for limiting the position of the piston 28 .

[0048] The outer surfaces of the core shaft end clamping assembly and the lower adapter 23 are covered with a first insulating sleeve 24 , and the outer surface of the lower shell 26 is covered with a second insulating sleeve 31 , and the first insulating sleeve 24 and the second insulating sleeve 31 are sealed and connected.

[0049] The electrode group in the present invention is a circumferential sealing structure, which achieves more effective sealing performance at high temperature; the insulating component is made of polyetheretherketone, which ensures the insulation performance between the electrodes and between the electrode and the core shaft at high temperature; (3) a piston balance compensation structure with a large adjustment amount is designed to achieve the purpose of balancing the internal and external pressures of the instrument under high temperature and high pressure environment. The present invention realizes all design functions by adjusting the sealing design between the double lateral electrodes, replacing the instrument insulation material and changing the piston balance compensation structure, avoiding the reduction of the insulation performance of the double lateral instrument at high temperature, improving the static pressure resistance of the instrument, and expanding the application environment of the instrument.

[0050] The present invention also provides an assembly method for an insulating sealed lateral electrode structure with balanced internal and external pressures. Based on the above-mentioned insulating sealed lateral electrode structure with balanced internal and external pressures, a core shaft fixed connection assembly is fixedly arranged at one end of a core shaft 11, and an insulating upper sleeve 15, an electrode insulating assembly and an insulating lower sleeve 19 are sequentially inserted into the core shaft 11, wherein the insulating upper sleeve 15 is sealedly connected to the core shaft fixed connection assembly, the electrode insulating assembly is sealedly connected to the insulating upper sleeve 15, and the insulating lower sleeve 19 is sealedly connected to the electrode insulating assembly. A core shaft support clamping assembly clamping sleeve is arranged at one end of a lower adapter 23 of the core shaft 11, and the assembly hole is inserted into the end of the core shaft 11, and is pressed against the core shaft support clamping assembly. The other end of the lower adapter 23 is inserted into the piston assembly, and the lower plug 30 is assembled on the piston assembly. The outer surface of the core shaft 11 is covered with a core shaft insulating sleeve 16, and the two ends of the core shaft 11 are respectively sleeved with an insulating upper sleeve 15 and an insulating lower sleeve 19; the electrode insulation assembly is sealed to achieve insulation performance between electrodes and between electrodes and other metal parts at high temperatures. A silicone oil flow channel is designed between the lower end of the core shaft 11, the lower adapter 23 and the lower shell 26 to lead the silicone oil into the lower shell 26, and a piston 28, a piston shaft 27 and a lower plug 30 are installed in the lower shell 26; the movement of the piston 28 in the lower shell 26 achieves pressure balance inside and outside the instrument.

[0051] Example

[0052] This embodiment provides an insulating sealed lateral electrode structure with balanced internal and external pressures, which internally comprises three parts: an electrode group 1, an oil passage 2, and a piston balance assembly 3;

[0053] The electrode group includes a mandrel 11, a mandrel head 12, a threaded half ring 13, a metal upper sleeve 14, an insulating upper sleeve 15, a mandrel insulating sleeve 16, various electrodes 17, various insulating blocks 18, an insulating lower sleeve 19, an electrode support sleeve 20 and a clamping nut 21. The mandrel insulating sleeve 16 is inserted from the lower end of the mandrel 11 and covers the outer surface of the mandrel 11; the mandrel head 12 is sealed and fixed to the mandrel 11 through threads and a sixth sealing ring 36; the metal upper sleeve 14 is inserted from the lower end of the mandrel 11 and is sealed and connected to the mandrel head 12; the upper end of the mandrel head 12 is equipped with a threaded half ring 13 that can be matched with the required interface; the insulating upper sleeve 15 is inserted from the lower end of the mandrel 11 and is sealed and connected to the metal upper sleeve 14; the electrode 17 is inserted from the lower end of the mandrel 11 and is sealed and connected to the insulating upper sleeve 15 The insulating block 18 is inserted from the lower end of the mandrel 11 and sealed with the electrode 17; each electrode 17 and each insulating block 18 are then sequentially installed and sealed; the support sleeve 20 is inserted from the lower end of the mandrel 11 and sealed with the insulating block 18; the inner hole of the support sleeve 20 is sealed with the sealing ring in the sealing groove at the lower end of the mandrel 11, thereby forming an oil chamber 100 composed of the outer surface of the mandrel 11 and the inner hole of the part sleeved on the mandrel 11; finally, the above parts are fixed by the clamping nut 21.

[0054] The core shaft 11 is sealed and connected with the lower adapter 23 through the seventh sealing ring 37 at the lower end and the thread. The inner hole at the lower end of the core shaft 11, the inner hole at the upper end of the lower adapter 23, the oil rod 25 and the third sealing ring 33 form a sealed oil chamber 102. An oil chamber 100 is formed between the inner ring of the part mounted on the core shaft 11 and the outer surface of the core shaft 11. The oil chamber 100 is connected with the oil chamber 102 through the oil hole 101 on the core shaft. The oil chamber 102 is connected with the piston balance assembly 3 through the oil hole 103 on the lower adapter 23. The first insulating sleeve 24 is sleeved on the electrode support sleeve 20, the clamping nut 21, and the surface of the lower adapter 23, covering the exposed metal surface. The oil passage 2 can connect the silicone oil in the electrode group 1 with the silicone oil in the piston balance assembly 3, and balance the pressure inside and outside the electrode group through the silicone oil in the piston balance assembly 3.

[0055] The piston balance assembly includes a lower adapter 23, a lower shell 26, a piston shaft 27, a piston 28, a piston support sleeve 29, a lower plug 30 and an insulating sleeve 31. The insulating sleeve 31 is installed on the upper end of the lower shell 26 to cover the upper end of the lower shell 26, and together with the insulating sleeve covering the surface of the lower adapter 23, controls the distance between the electrode 17 and the exposed metal section of the lower shell 26; the lower adapter 23 is connected to the upper end of the lower shell 26 through a second sealing ring 32 and a thread; the lower plug 30 is connected to the lower end of the lower shell 26 through a second sealing ring 32 and a thread; the lower end of the lower plug 30 can be sealed and connected to the required interface; the piston shaft 27 is connected to the upper end of the lower adapter 23 through a third sealing ring 33 installed on the sealing grooves at both ends. The inner hole of the end and the inner hole of the upper end of the lower plug 30 are sealed; the piston 28 is sealed with the lower housing 26 through the fourth sealing ring 34 installed on the sealing groove of the outer circle; the piston 28 is sealed with the piston shaft 27 through the fifth sealing ring 35 installed on the sealing groove of the inner hole; the piston support sleeve 29 is connected to the piston shaft 27 through a thread to limit the outward movement of the piston 28; the upper end of the lower adapter 23, the inner hole of the lower housing 26, the outer surface of the piston shaft 27 and the piston 28 form an oil chamber 104, and the oil chamber 103 is connected with the oil chamber 102 through the oil hole 103. There is a large amount of silicone oil in the oil chamber 104, accounting for 80% of the total oil volume, which can realize the balance adjustment of the internal and external pressures of the instrument under high temperature and high pressure environment. At the same time, the large amount of oil can reduce the number of times the instrument is replenished with oil, and multiple well logging can be realized with one oil injection, which greatly improves the efficiency of instrument use and logging.

[0056] In summary, the present invention provides an insulating sealed lateral electrode structure and an assembly method for balanced internal and external pressures. The electrode group and the piston balancing assembly are coaxially connected, and the electrode group and the piston balancing assembly are a circumferential sealing structure. An insulating upper sleeve and an insulating lower sleeve are respectively inserted into the two ends of the core shaft, and an electrode insulating assembly is inserted into the middle of the core shaft to ensure the insulation performance between electrodes and between electrodes and other metal parts under high temperature. One end of the oil channel is inserted into the core shaft and connected with the oil chamber of the core shaft, and the other end is inserted into the assembly hole of the lower adapter and connected with the oil chamber in the piston assembly. A silicone oil flow channel is designed between the lower end of the core shaft, the lower adapter and the lower shell to lead the silicone oil into the lower shell. The lower shell is equipped with a piston, a piston shaft and a lower plug; the internal and external pressure balance of the instrument is achieved by the movement of the piston in the lower shell.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. An insulating sealed lateral electrode structure with balanced internal and external pressures, It is characterized in that The invention comprises a coaxially connected electrode group (1) and a piston balancing assembly (3); an oil passage (2) is arranged between the electrode group (1) and the piston balancing assembly (3); the electrode group (1) comprises a mandrel (11), a mandrel fixed connection assembly, an insulating upper sleeve (15), an electrode insulating assembly, an insulating lower sleeve (19), and a mandrel support and clamping assembly; the piston balancing assembly (3) comprises a lower adapter (23), a piston assembly and a lower plug (30); the mandrel fixed connection assembly is fixedly arranged at one end of the mandrel (11), the insulating upper sleeve (15), the electrode insulating assembly and the insulating lower sleeve (19) are sequentially inserted into the mandrel (11), wherein the insulating upper sleeve (15) The core shaft (11) is sealed and connected to the fixed connection assembly, the electrode insulation assembly is sealed and connected to the insulating upper sleeve (15), and the insulating lower sleeve (19) is sealed and connected to the electrode insulation assembly; the core shaft support and clamping assembly clamping sleeve is arranged at the other end of the core shaft (11); the assembly hole at one end of the lower adapter (23) is inserted into the end of the core shaft (11) and abuts against the core shaft support and clamping assembly; the other end of the lower adapter (23) is inserted into the piston assembly, and the lower plug (30) is assembled on the piston assembly; one end of the oil passage (2) is inserted into the core shaft (11) and communicates with the oil chamber of the core shaft (11), and the other end is inserted into the assembly hole of the lower adapter (23) and communicates with the oil chamber in the piston assembly.

2. The insulating sealed lateral electrode structure with balanced internal and external pressure according to claim 1, It is characterized in that The electrode insulation assembly comprises a plurality of electrodes (17) and an insulating block (18); the plurality of electrodes (17) and the insulating block (18) are alternately inserted into the core shaft (11) in sequence; the structure of the electrode (17) is an annular structure, wherein bosses with the same structure are provided on both sides of the electrode (17), wherein the outer diameter of the bosses on both sides of the electrode (17) is smaller than the outer diameter of the electrode (17), and grooves are provided on the bosses on both sides of the middle electrode (17) for sleeve-mounting a first sealing ring (22); the structure of the insulating block (18) is an annular structure, wherein concave platforms with the same structure are provided on both sides of the insulating block (18), and the concave platforms on both sides of the insulating block (18) are assembled with the bosses of the electrodes (17) adjacent to the insulating block (18) on the left and right, and a first sealing ring (22) is provided for sealing between the concave platforms and the bosses.

3. The insulating sealed lateral electrode structure with balanced internal and external pressure according to claim 1, It is characterized in that The spindle fixed connection assembly comprises a spindle head (12), a threaded half ring (13) and a metal upper sleeve (14); the spindle head (12) is sealed and connected to the spindle (11) via a thread and a sixth sealing ring (36); the metal upper sleeve (14) is sleeved on the spindle (11), wherein one end of the metal upper sleeve (14) is sealed and connected to the spindle head (12), and the other end is sealed and connected to the insulating upper sleeve (15); the threaded half ring (13) is arranged on the spindle head (12) for matching with the interface.

4. The insulating sealed lateral electrode structure with balanced internal and external pressure according to claim 1, It is characterized in that The core shaft end clamping assembly comprises an electrode support sleeve (20) and a clamping nut (21); the electrode support sleeve (20) is sleeved on the core shaft (11), and the electrode support sleeve (20) is sealed and connected to the end of the insulating lower sleeve (19); the clamping nut (21) is sleeved on the core shaft (11) and clamped on the electrode support sleeve (20); the end of the assembly hole of the lower adapter (23) abuts against the clamping nut (21); and a plurality of seventh sealing rings (37) are sleeved on the end of the core shaft (11) and the assembly holes of the electrode support sleeve (20) and the lower adapter (23).

5. The insulating sealed lateral electrode structure with balanced internal and external pressure according to claim 1, It is characterized in that The outer surface of the core shaft (11) is covered with a core shaft insulating sleeve (16), and a gap exists between the core shaft insulating sleeve (16) and the insulating upper sleeve (15), the electrode insulating assembly and the insulating lower sleeve (19) to form a first oil chamber (100). The core shaft (11) is provided with a first oil passage hole (101) at the end of the first oil chamber (100) for connecting the first oil chamber (100) to the oil passage channel (2) through the first oil passage hole (101).

6. The insulating sealed lateral electrode structure with balanced internal and external pressure according to claim 5, It is characterized in that The oil passage (2) comprises an oil passage rod (25), one end of which is inserted into the inner hole of the core shaft (11), and the other end is inserted into the assembly hole of the lower adapter (23); a third sealing ring (33) is sleeved between the outer walls of the two ends of the oil passage rod (25) and the inner walls of the inner hole of the core shaft (11) and the assembly hole of the adapter (23); a gap is formed between the middle outer wall of the oil passage rod (25) and the inner wall of the core shaft (11) to form a second oil chamber (102); a second oil passage hole (103) is provided on the lower adapter (23); one end of the second oil chamber (102) is connected to the first oil chamber (100) through the first oil passage hole (101), and the other end is connected to the oil chamber of the piston assembly through the second oil passage hole (103).

7. The insulating sealed lateral electrode structure with balanced internal and external pressure according to claim 6, It is characterized in that The piston assembly comprises a lower housing (26), a piston shaft (27) and a piston (28); the end of the lower housing (26) is assembled on the lower adapter (23); the lower plug (30) is assembled on the lower housing (26), and a second sealing ring (32) is arranged between the lower plug (30) and the lower housing (26); the piston (28) is arranged in the lower housing (26), wherein a fourth sealing ring (34) is sleeved between the outer circle of the piston and the lower housing (26); the piston shaft (27) is arranged in the lower housing (26), wherein one end of the piston shaft (27) is inserted into the lower housing (26); The end of the lower adapter (23) is sleeved with an eighth sealing ring (38) between the end of the lower adapter (23); the other end of the piston shaft (27) is inserted into the lower plug (30) through the piston (28); a fifth sealing ring (35) is sleeved between the inner circle of the piston shaft (27) and the piston (28); and a ninth sealing ring is sleeved between the piston shaft (27) and the lower plug (30); a third oil chamber (104) is formed between the lower adapter (23) and the piston shaft (27) and the piston (28); and the third oil chamber (104) is connected to the second oil hole (103).

8. The insulating sealed lateral electrode structure with balanced internal and external pressure according to claim 7, It is characterized in that A piston support sleeve (29) is arranged between the piston shaft (27) and the piston (28) to limit the position of the piston (28).

9. An insulating sealed lateral electrode structure with balanced internal and external pressures according to claim 7, It is characterized in that The outer surfaces of the core shaft end clamping assembly and the lower adapter (23) are covered with a first insulating sleeve (24), and the outer surface of the lower shell (26) is covered with a second insulating sleeve (31), and the first insulating sleeve (24) and the second insulating sleeve (31) are sealed and connected.

10. An assembly method of an insulating sealed lateral electrode structure with balanced internal and external pressures, based on the insulating sealed lateral electrode structure with balanced internal and external pressures according to any one of claims 1 to 9, It is characterized in that The process includes the following: The mandrel fixing connection assembly is fixedly arranged at one end of the mandrel (11), and the insulating upper sleeve (15), the electrode insulating assembly and the insulating lower sleeve (19) are sequentially inserted into the mandrel (11), wherein the insulating upper sleeve (15) is sealedly connected to the mandrel fixing connection assembly, the electrode insulating assembly is sealedly connected to the insulating upper sleeve (15), and the insulating lower sleeve (19) is sealedly connected to the electrode insulating assembly. The mandrel supporting and clamping assembly clamping sleeve is arranged at one end of the lower adapter (23) of the mandrel (11), the assembly hole is inserted into the end of the mandrel (11), and abuts against the mandrel supporting and clamping assembly; the other end of the lower adapter (23) is inserted into the piston assembly, and the lower plug (30) is assembled on the piston assembly. The outer surface of the mandrel (11) is covered with a mandrel insulating sleeve (16), and the two ends of the mandrel (11) are respectively sleeved with an insulating upper sleeve (15) and an insulating lower sleeve (19); the electrode insulating assembly is sealed to achieve insulation performance between electrodes and between electrodes and other metal parts at high temperatures; a silicone oil flow channel is designed between the lower end of the mandrel (11), the lower adapter (23) and the lower shell (26), and the silicone oil is introduced into the lower shell (26); a piston (28), a piston shaft (27) and a lower plug (30) are installed in the lower shell (26); and the movement of the piston (28) in the lower shell (26) achieves pressure balance inside and outside the instrument.

Images