Maintainable logging electrical imaging auxiliary polar plate

Abstract

The invention provides a maintainable logging electrical imaging auxiliary polar plate, and relates to the technical field of petroleum well logging. The logging electrical imaging auxiliary pole plate comprises an auxiliary pole plate body, a cover plate, a plurality of electrode buckles and a plurality of pole buckle connecting assemblies, an accommodating groove, a connecting via hole and a plurality of mounting sleeve holes are formed in the auxiliary polar plate body, and one end of a connecting wire of the electrode buckle penetrates through the connecting via hole and enters the accommodating groove; a pole buckle connecting assembly and an electrode buckle are detachably arranged in each mounting sleeve hole, the electrode buckles are detachably arranged in the mounting sleeve holes through the corresponding pole buckle connecting assemblies, each electrode buckle is provided with an electric connecting end and a conductive end, and the electric connecting end of each electrode buckle is connected with one end of the corresponding connecting wire; the cover plate is used for covering the containing groove to form a sealed containing cavity, and the containing cavity is used for containing balance oil. According to the maintainable logging electrical imaging auxiliary polar plate, the problem that in the prior art, an electrode buckle is fixedly poured on an auxiliary polar plate and cannot be maintained, so that the maintenance cost of a logging imager is high is solved.

Description

Technical Field

[0001] This invention relates to the field of oil well logging technology, and more specifically, to a maintainable logging electrical imaging sub-electrode. Background Technology

[0002] The whole-bore micro-resistivity scanning imaging logging tool is based on the principle of electrical logging. During logging, both the electrode clips and the electrode shell transmit the main current and shielding current to the formation through conductive mud. The current intensity emitted by each electrode and electrode shell varies with the formation resistivity. The micro-resistivity scanning imaging logging tool mainly consists of two parts: electronic circuitry and a probe. The probe has a push arm, on which an electrode plate is mounted, and on the electrode plate are electrode clips. During logging, the push arm opens, bringing the electrode plate into contact with the wellbore wall, and current is transmitted to the formation through the electrode clips, thereby collecting the formation's current and voltage signals for resistivity calculation. By acquiring data from multiple signals, micro-resistivity electrical imaging data is formed.

[0003] In existing technology, the secondary electrode clips and wires are directly connected to the main electrode plate. The wires are secured to the secondary electrode plate with adhesive. Due to the lack of a pressure balancing system, the electrode clips are easily damaged when downhole pressure is too high. Since all electrode clips and wires are fixed to the secondary electrode plate by resin insulation, if one clip is damaged, the entire plate will be damaged upon disassembly. Therefore, if any electrode clip is damaged, a new secondary electrode plate needs to be replaced, resulting in high maintenance costs and production delays. Instruments without secondary electrodes, with only four main electrode plates, have a total of only 96 electrode clips. During logging, the coverage rate is only 49%-51%, which completely fails to meet the client's coverage requirements.

[0004] Therefore, there is an urgent need for a device to solve at least one of the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a maintainable logging electrical imaging sub-electrode plate to solve the problem of high maintenance costs of logging imaging instruments caused by the inability to maintain the electrode clips fixed to the sub-electrode plate in the prior art.

[0006] To achieve the above objectives, the present invention provides a maintainable logging electrical imaging sub-electrode plate, the maintainable logging electrical imaging sub-electrode plate comprising: Sub-electrode plate body, cover plate, multiple electrode clips and multiple electrode clip connection assemblies; The sub-electrode plate body is provided with a receiving groove, a connecting through hole communicating with the receiving groove, and multiple mounting sleeve holes. One end of the connecting wire of each electrode buckle can pass through the connecting through hole into the receiving groove and connect with the corresponding electrode buckle. Each mounting sleeve hole is detachably provided with a pole clip connection assembly and an electrode clip. The electrode clip is detachably installed in the mounting sleeve hole through the corresponding pole clip connection assembly. Each electrode clip has an electrical connection end and a conductive end. The electrical connection end of each electrode clip is connected to one end of the corresponding connecting wire. The cover plate is used to seal the receiving groove to form a sealed receiving cavity, which is used to contain balance oil.

[0007] Specifically, an annular sealing groove is provided on the side of the cover plate facing the receiving groove.

[0008] Specifically, an annular sealing ring is provided along the inner groove edge of the annular sealing groove.

[0009] Specifically, each electrode buckle has a connecting thread at its electrical connection end, and the electrode buckle is threadedly connected to the corresponding electrode buckle connection assembly through the connecting thread.

[0010] Specifically, the electrode fastener connection assembly includes: an electrode fastener insulating sleeve and a locking nut; The electrode buckle insulating sleeve is provided with electrode buckle mounting holes. The electrode buckle mounting holes are stepped holes with a punched end and a small hole end. The electrode buckle insulating sleeve is embedded in the corresponding mounting sleeve hole. The conductive end of the electrode buckle is embedded in the large hole of the electrode buckle mounting hole. The electrical connection end of the electrode buckle passes through the small hole of the electrode buckle mounting hole and is connected to one end of the corresponding connecting wire. The locking nut is screwed onto the electrical connection end of the electrode buckle.

[0011] Specifically, the electrical connection end of the electrode buckle matches the size of the small hole in the electrode buckle mounting hole.

[0012] Specifically, the electrode fastener assembly further includes an electrode sealing ring and an insulating sealing ring; The electrode sealing ring is disposed between the wall of the large hole of the electrode buckle and the electrode buckle mounting hole; The insulating sealing ring is disposed between the bottom of the electrode buckle and the large hole of the electrode buckle mounting hole.

[0013] Specifically, the electrode buckle connection assembly also includes an insulating pad, which is fitted onto the electrical connection end of the electrode buckle and located between the locking nut and the opening of the mounting sleeve hole.

[0014] Specifically, the logging electrical imaging sub-electrode plate also includes a guide wear-resistant block, which is detachably mounted on the sub-electrode plate body.

[0015] Specifically, the secondary electrode plate body is also provided with a connecting shaft.

[0016] The maintainable logging electrical imaging sub-electrode plate provided by this invention has a receiving groove and multiple mounting holes on the sub-electrode plate body. Each mounting hole contains an electrode clip connection assembly and an electrode clip. The electrode clip is detachably mounted in the mounting hole via the electrode clip connection assembly. This allows for easy replacement of any damaged electrode clip. The mounting hole communicates with the receiving groove on the sub-electrode plate body. The receiving groove facilitates electrode clip installation and the arrangement of connecting wires to the electrical connection ends of the electrode clip. After electrode clip installation, a cover plate seals the receiving groove to form a receiving cavity, into which balancing oil is injected to balance the pressure inside and outside the cavity. The maintainable logging electrical imaging sub-electrode plate provided by this invention allows for detachable connection of the electrode clip to the sub-electrode plate body via the electrode clip connection assembly, facilitating replacement of damaged electrode clips, avoiding waste, reducing maintenance costs, and solving the problem of high maintenance costs for logging imaging instruments caused by the electrode clips being fixedly cast onto the sub-electrode plate in existing technologies.

[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is an exploded view of the maintainable logging electrical imaging sub-electrode provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the maintainable logging electrical imaging sub-electrode plate without a cover plate provided in an embodiment of the present invention; Figure 3 yes Figure 2 Sectional view along direction AA; Figure 4 yes Figure 3 Exploded enlarged schematic diagram of the electrode fastener assembly at point B.

[0019] Explanation of reference numerals in the attached figures 1-Sub-electrode plate body; 2-Electrode buckle; 3-Electrode buckle connecting assembly; 4-Cover plate; 5-Guide wear-resistant block; 11-Connecting shaft; 12-Snap ring; 13-Slip ring; 14-Back pressure ring; 15-Shaft sealing ring; 16-Retaining ring; 17-Shaft sleeve; 31-Electrode buckle insulating sleeve; 32-Locking nut; 33-Electrode sealing ring; 34-Insulating sealing ring; 35-Insulating pad. Detailed Implementation The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0020] Figure 1 It is an exploded view of a maintainable logging electrical imaging subplate; Figure 2 This is a schematic diagram of a maintainable logging electrical imaging sub-electrode without a cover plate. Figure 3 yes Figure 2 Sectional view along direction AA; Figure 4 yes Figure 3 An enlarged schematic diagram of the explosion of the electrode fastener assembly at point B.

[0021] like Figures 1-4 As shown, the present invention provides a maintainable logging electrical imaging sub-electrode plate, the maintainable logging electrical imaging sub-electrode plate comprising: Sub-electrode body 1, cover plate 4, multiple electrode clips 2 and multiple electrode clip connecting assemblies 3; The sub-electrode plate body 1 is provided with a receiving groove, a connecting through hole and a plurality of mounting sleeve holes communicating with the receiving groove. One end of the connecting wire of each electrode buckle passes through the connecting through hole and enters the receiving groove to connect with the corresponding electrode buckle 2. Each mounting sleeve hole is detachably provided with a pole clip connection assembly 3 and an electrode clip 2. The electrode clip 2 is detachably installed in the mounting sleeve hole through the corresponding pole clip connection assembly 3. The electrode clip 2 has an electrical connection end and a conductive end. The electrical connection end of the electrode clip 2 is connected to one end of the corresponding connecting wire. The cover plate 4 is used to seal the receiving groove to form a sealed receiving cavity, which is used to contain balance oil.

[0022] The maintainable logging electrical imaging sub-electrode plate provided by this invention has a receiving groove, a connecting through hole, and multiple mounting sleeve holes on the sub-electrode plate body 1. The sub-electrode plate body 1 is made of QBe2 metal material with a hardness of HRC35-38, possessing certain strength and toughness. Figure 1 and Figure 3As shown, both the mounting sleeve hole and the connecting through hole are connected to the receiving groove. The mounting sleeve hole and the receiving groove are located on both sides of the sub-electrode plate body 1. The electrode buckle connecting assembly 3 is embedded in the mounting sleeve hole. The electrode buckle 2 is detachably installed in the mounting sleeve hole through the corresponding electrode buckle connecting assembly 3. The electrical connection end of each electrode buckle 2 is connected to one end of the connecting wire that enters the receiving groove through the connecting through hole. After the installation of the electrode buckle 2 is completed, the cover plate 4 seals the receiving groove, making the receiving groove a receiving cavity. By injecting balance oil into the receiving cavity, the pressure inside and outside the receiving cavity of the maintainable logging electrical imaging sub-electrode plate can be balanced under pressure. The electrode buckle 2 is detachably installed in the mounting sleeve hole of the sub-electrode plate body 1 through the electrode buckle connecting assembly 3, which facilitates replacement of the electrode buckle 2 if it is damaged. In this way, even if an electrode buckle 2 is damaged, only the damaged electrode buckle 2 needs to be replaced, without replacing the entire sub-electrode plate body 1 and the undamaged electrode buckles 2, avoiding waste, reducing maintenance costs, and solving the problem of high maintenance costs of logging imaging instruments caused by the electrode buckles being fixed and cast on the sub-electrode plate in the prior art.

[0023] To seal the gap between the cover plate 4 and the groove of the receiving slot of the secondary electrode plate body 1, such as Figure 1 An annular sealing groove is provided on the side of the cover plate 4 facing the receiving groove.

[0024] An annular sealing ring is provided along the inner edge of the annular sealing groove.

[0025] An annular sealing groove is opened at the end of the cover plate 4 facing the receiving groove, and an annular sealing ring is set along the inner edge of the annular sealing groove. When the cover plate 4 covers the opening of the receiving groove, a filler is set in the annular sealing groove to seal the gap between the cover plate and the opening of the receiving groove. In order to prevent the balance oil injected into the receiving cavity from flowing out of the receiving cavity, an annular sealing ring is set along the inner edge of the receiving groove. The balance oil is silicone oil. The annular sealing ring further improves the sealing effect between the cover plate 4 and the opening of the receiving groove.

[0026] In one embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, each electrode buckle 2 has a connecting thread at its electrical connection end, and the electrode buckle 2 is threadedly connected to the corresponding electrode buckle connection assembly 3 through the connecting thread.

[0027] The pole buckle connection assembly 3 includes: a pole buckle insulating sleeve 31 and a locking nut 32; The electrode buckle insulating sleeve 31 is provided with an electrode buckle mounting hole, which is a stepped hole with a large hole end and a small hole end. The electrode buckle insulating sleeve 31 is embedded in the corresponding mounting sleeve hole. The conductive end of the electrode buckle 2 is embedded in the large hole of the electrode buckle mounting hole. The electrical connection end of the electrode buckle 2 passes through the small hole of the electrode buckle mounting hole and is connected to one end of the corresponding connecting wire. The locking nut 32 is screwed onto the electrical connection end of the electrode buckle 2.

[0028] The electrical connection end of the electrode buckle 2 matches the size of the small hole in the electrode buckle mounting hole.

[0029] The electrode fastener assembly 3 also includes an electrode sealing ring 33 and an insulating sealing ring 24; The electrode sealing ring 33 is disposed between the electrode buckle 2 and the wall of the large hole of the electrode buckle mounting hole; The insulating sealing ring 34 is disposed between the bottom of the large hole of the pole buckle insulating sleeve 31 and the pole buckle mounting hole.

[0030] The electrode buckle connection assembly 3 also includes an insulating pad 35, which is fitted onto the electrical connection end of the electrode buckle 2 and located between the locking nut 32 and the opening of the mounting sleeve hole.

[0031] Both the mounting hole on the secondary electrode plate body 1 and the electrode fastener mounting hole on the electrode fastener insulating sleeve 31 are stepped holes. The shape and size of the electrode fastener insulating sleeve 31 match the mounting hole. The electrode fastener insulating sleeve 31 is made of insulating material. During installation, the electrode fastener insulating sleeve 31 is first inserted into the mounting hole, and then the electrode fastener 2 is inserted into the electrode fastener mounting hole of the electrode fastener insulating sleeve 31. Figure 3 As shown, an electrode sealing ring 33 is provided between the electrode buckle 2 and the electrode buckle insulating sleeve 31, and the electrode buckle mounting hole wall is provided to seal the gap between the electrode buckle 2 and the electrode buckle insulating sleeve 31. An insulating sealing ring 34 is provided between the electrode buckle 2 and the bottom of the electrode buckle insulating sleeve 31, and the bottom of the electrode buckle insulating sleeve 31 and the electrode buckle 2 are provided to seal the gap between the bottom of the electrode buckle insulating sleeve 31 and the electrode buckle 2. The electrode sealing ring 33 and the insulating sealing ring 34 can prevent the balance oil in the containment cavity from flowing out between the electrode buckle 2 and the electrode buckle insulating sleeve 31. The electrical connection end of electrode buckle 2 passes through the small hole of electrode buckle mounting hole in electrode buckle insulating sleeve 31 and enters the receiving groove. The electrical connection end of electrode buckle 2 is connected to one end of the connecting wire entering the receiving groove. Locking nut 32 is screwed onto the electrical connection end of electrode buckle 2. To ensure that locking nut 32 can fix electrode buckle 2, such as... Figure 3As shown, the outer diameter of the thread on the electrical connection end of the electrode buckle 2 matches the size of the small hole in the electrode buckle mounting hole. This allows the electrode buckle 2 to be fixed in the electrode buckle mounting hole when the locking nut 32 is tightened, and the electrode buckle insulating sleeve 31 is also fixed in the electrode buckle mounting hole. To ensure installation safety, an insulating pad 35 is placed between the locking nut 32 and the opening of the mounting sleeve hole. The insulating pad 35 is also fitted onto the electrical connection end of the electrode buckle 2. The insulating pad 35 not only ensures the safety of the electrode buckle 2 but also prevents the locking nut 32 from loosening. After all the electrode buckles 2 are installed, the cover plate 4 seals the receiving groove. The cover plate 4 is fixed to the groove opening of the receiving groove of the secondary electrode plate body 1 by multiple screws.

[0032] To ensure the service life of the maintainable logging electrical imaging sub-electrode, the logging electrical imaging sub-electrode also includes a guide wear-resistant block 5, which is detachably mounted on the sub-electrode body 1.

[0033] like Figure 1 As shown, a guide wear-resistant block 5 is set on the sub-electrode body 1. For example, if the wellbore size is 6 inches and the wellbore diameter is 0.1524 m, in order for the maintainable logging electrical imaging sub-electrode to be able to enter the well for inspection according to the logging size, the curvature of the sub-electrode body 1 is calculated according to the wellbore diameter, K=1 / (0.1524÷2), where K is the curvature of the sub-electrode body; if the wellbore size is 8 inches and the wellbore diameter is 0.2032 m, the curvature of the sub-electrode body 1 is K=1 / (0.2032÷2). According to different wellbore sizes, a suitable sub-electrode body 1 is selected to facilitate the smooth completion of inspection by the maintainable logging electrical imaging sub-electrode. During use, the maintainable logging electrical imaging sub-electrode plate will rub against the well wall. The guide wear-resistant block 5 set on the sub-electrode plate body 1 can play the roles of guidance, buffering and wear resistance, thereby protecting the sub-electrode plate body 1. The guide wear-resistant block 5 is designed with an irregular structure. The side of the guide wear-resistant block 5 that contacts the well wall is designed with an arc shape to reduce the wear and loss between the guide wear-resistant block 5 and the well wall.

[0034] like Figure 1 and Figure 2 As shown, the secondary electrode plate body 1 is also provided with a connecting shaft 11. In order to facilitate the connection between the secondary electrode plate body 1 and the main electrode plate, the connecting shaft 11 is connected to the secondary electrode plate body 1. The connecting shaft 11 is integrally formed with the secondary electrode plate body 1. When the secondary electrode plate body 1 is connected to the main electrode plate, a connecting auxiliary component is also provided on the connecting shaft 11. The auxiliary component includes a retaining ring 12, a slip ring 13, a back pressure ring 14, a shaft sealing ring 15, a retaining ring 16, and a bushing 17. The auxiliary component facilitates the connection between the secondary electrode plate body 1 and the main electrode plate.

[0035] The maintainable logging electrical imaging sub-electrode plate provided by this invention has a receiving groove and multiple mounting holes on the sub-electrode plate body. Each mounting hole contains an electrode clip connection assembly and an electrode clip. The electrode clip is detachably mounted in the mounting hole via the electrode clip connection assembly. This allows for easy replacement of any damaged electrode clip. The mounting hole communicates with the receiving groove on the sub-electrode plate body. The receiving groove facilitates electrode clip installation and the arrangement of connecting wires to the electrical connection ends of the electrode clip. After electrode clip installation, a cover plate seals the receiving groove to form a receiving cavity, into which balancing oil is injected to balance the pressure inside and outside the cavity. The maintainable logging electrical imaging sub-electrode plate provided by this invention allows for detachable connection of the electrode clip to the sub-electrode plate body via the electrode clip connection assembly, facilitating replacement of damaged electrode clips, avoiding waste, reducing maintenance costs, and solving the problem of high maintenance costs for logging imaging instruments caused by the electrode clips being fixedly cast onto the sub-electrode plate in existing technologies.

[0036] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0037] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0038] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0039] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A maintainable logging electrical imaging sub-electrode, characterized in that, The logging electrical imaging sub-electrode includes: Sub-electrode body (1), cover plate (4), multiple electrode clips (2) and multiple electrode clip connection components (3); The sub-electrode plate body (1) is provided with a receiving groove, a connecting through hole and a plurality of mounting sleeve holes communicating with the receiving groove. One end of the connecting wire of each electrode buckle (2) can pass through the connecting through hole into the receiving groove and connect with the corresponding electrode buckle (2). Each mounting sleeve hole is detachably provided with a pole clip connecting assembly (3) and an electrode clip (2). The electrode clip (2) is detachably installed in the corresponding mounting sleeve hole through the corresponding pole clip connecting assembly (3). The electrode buckle (2) has an electrical connection end and a conductive end, and the electrical connection end of the electrode buckle (2) is connected to one end of the corresponding connecting wire; The cover plate (4) is used to seal the receiving groove to form a sealed receiving cavity, which is used to contain balance oil.

2. The maintainable logging electrical imaging sub-electrode plate according to claim 1, characterized in that, The cover plate (4) has an annular sealing groove on the side facing the receiving groove.

3. The maintainable logging electrical imaging sub-electrode plate according to claim 2, characterized in that, An annular sealing ring is provided along the inner edge of the annular sealing groove.

4. The maintainable logging electrical imaging sub-electrode plate according to claim 1, characterized in that, Each electrode buckle (2) has a connecting thread at its electrical connection end, and the electrode buckle (2) is threadedly connected to the corresponding electrode buckle connection assembly (3) through the connecting thread.

5. The maintainable logging electrical imaging sub-electrode plate according to claim 4, characterized in that, The pole buckle connection assembly (3) includes: pole buckle insulating sleeve (31) and locking nut (32); The electrode buckle insulating sleeve (31) is provided with a electrode buckle mounting hole. The electrode buckle mounting hole is a stepped hole with a large hole end and a small hole end. The electrode buckle insulating sleeve (31) is embedded in the corresponding mounting sleeve hole. The conductive end of the electrode buckle (2) is embedded in the large hole of the electrode buckle mounting hole. The electrical connection end of the electrode buckle (2) passes through the small hole of the electrode buckle mounting hole and is connected to one end of the corresponding connecting wire. The locking nut (32) is screwed onto the electrical connection end of the electrode buckle (2).

6. The maintainable logging electrical imaging sub-electrode plate according to claim 5, characterized in that, The electrical connection end of the electrode buckle (2) matches the size of the small hole of the electrode buckle mounting hole.

7. The maintainable logging electrical imaging sub-electrode plate according to claim 5, characterized in that, The electrode fastener assembly (3) also includes an electrode sealing ring (33) and an insulating sealing ring (34). The electrode sealing ring (33) is disposed between the electrode buckle (2) and the wall of the large hole of the electrode buckle mounting hole; The insulating sealing ring (34) is disposed between the bottom of the electrode buckle (2) and the large hole of the electrode buckle mounting hole.

8. The maintainable logging electrical imaging sub-electrode plate according to claim 7, characterized in that, The electrode buckle connection assembly (3) also includes an insulating pad (35), which is fitted onto the electrical connection end of the electrode buckle (2) and located between the locking nut (32) and the opening of the mounting sleeve hole.

9. The maintainable logging electrical imaging sub-electrode plate according to claim 1, characterized in that, The logging electrical imaging sub-electrode also includes a guide wear-resistant block (5), which is detachably mounted on the sub-electrode body (1).

10. The maintainable logging electrical imaging sub-electrode plate according to claim 7, characterized in that, The secondary electrode plate body (1) is also provided with a connecting shaft (11).

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