Pressure compensation array lateral logging instrument
By setting oil drain holes and storage ring tanks in the logging instrument, emergency and preliminary pressure relief of silicone oil is achieved, and the pressure unbalanced problem when the piston compresses to the limit in high-temperature and high-pressure environment is solved, reducing the risk of damage to the logging instrument and improving the Pressure compensation adjustment effect.
Patent Information
- Application Number
- CN202323505820.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-21
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-21
AI Technical Summary
In a downhole environment with high temperature and high pressure, when the adjusting piston compresses to the limit, the temperature and pressure of the silicone oil fail to reach equilibrium, resulting in the risk of damage to the logging instrument.
A pressure compensation array lateral logger is designed. By setting oil drain holes and oil drain ring grooves on the outer electrodes, when the adjustment piston compresses to the limit, silicone oil leaks out through the oil drain holes, achieving emergency pressure relief, and in the adjustment A storage ring groove is provided between the piston and the inner electrode to initially buffer the pressure relief and reduce the risk of damage.
It effectively reduces the risk of damage to the well logging instrument, maintains pressure balance through the emergency and preliminary pressure relief of silicone oil, and improves the pressure compensation and regulation effect.
Smart Images
Figure CN222162580U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of well logging instruments, and in particular relates to a pressure compensation array lateral logging instrument. Background Art
[0002] Array lateral logging technology is one of the main methods for open hole formation resistivity imaging measurement. It uses a main electrode and a series of symmetrically placed focusing electrodes to perform formation measurement. It can simultaneously provide four resistivity curves at different detection depths, and complete apparent resistivity measurements at four different detection depths, from the resistivity of the formation invasion zone to the resistivity of the original formation. It is used to study the changes in resistivity between formations and complete the fine division of formation information.
[0003] The logging instrument in the related art usually includes an instrument body, an inner electrode and an outer electrode are arranged on the instrument body, a piston ring cavity is formed between the inner electrode and the outer electrode, an adjusting piston is slidably arranged in the piston ring cavity, and an adjusting spring for pushing the adjusting piston to slide is arranged in the piston ring cavity. Since most of the underground environments are high temperature and high pressure, the temperature and pressure of the silicone oil in the piston ring cavity increase. At this time, the adjusting piston slides toward the adjusting spring to balance the silicone oil pressure, thereby protecting the logging instrument.
[0004] However, if the temperature and pressure downhole are very high, the adjusting piston slides toward the adjusting spring under the pressure of the silicone oil and compresses the adjusting spring to the limit position, and the pressure does not reach a balanced state, then the temperature and pressure of the silicone oil will continue to increase, which may easily lead to the risk of damage to the logging instrument, which needs to be improved. Utility Model Content
[0005] In order to solve all or part of the above problems, the purpose of the utility model is to provide a pressure-compensated array lateral logging instrument, which can realize emergency pressure relief of silicone oil and reduce the risk of damage to the logging instrument.
[0006] The utility model provides a pressure-compensated array lateral logging instrument, comprising an instrument body, wherein an inner electrode and an outer electrode are arranged on the instrument body, a piston ring cavity is formed between the inner electrode and the outer electrode, an adjusting spring and an adjusting piston are arranged in the piston ring cavity, an oil drain hole connected with the piston ring cavity is arranged on the outer side wall of the outer electrode away from one end of the adjusting spring, and the oil drain ring groove is arranged along the circumferential direction of the adjusting piston, and when the adjusting piston moves toward the adjusting spring under the pressure of silicone oil and the adjusting spring is compressed to the limit state, the oil drain ring groove is connected with the oil drain hole.
[0007] Optionally, a sealing portion is provided in the oil drain hole to seal the oil drain hole, and the sealing portion is interference fit with the oil drain hole.
[0008] Optionally, a pair of elastic sealing rings are provided on the outer side wall of the regulating piston to achieve sealing between the regulating piston and the outer electrode, and the pair of sealing rings are respectively located between the regulating spring and the oil drain ring groove, and the pair of sealing rings are distributed on both sides of the oil drain hole.
[0009] Optionally, a pair of elastic sealing rings are provided on the inner side wall of the regulating piston to achieve sealing between the regulating piston and the inner electrode.
[0010] Optionally, a pair of the sealing rings and a pair of the sealing rings are distributed at intervals, and the side close to the adjusting spring is the sealing ring, and the side close to the oil drain ring groove is the sealing ring.
[0011] Optionally, a storage ring groove is provided on the inner electrode, and the storage ring groove is provided along the circumferential direction of the inner electrode, and a balance ring groove is provided on the inner side wall of the regulating piston away from one end of the regulating spring. When the regulating piston moves toward the regulating spring and connects the balance ring groove with the storage ring groove, the silicone oil can enter the storage ring groove to achieve initial pressure relief of the silicone oil. At this time, the oil leakage ring groove is not connected with the oil leakage hole.
[0012] Optionally, a buffer ring groove is provided on an outer side wall of the regulating piston close to one end of the regulating spring, and the buffer ring groove is provided along the circumferential direction of the regulating piston.
[0013] Optionally, a plurality of the adjusting springs are provided, and the plurality of adjusting springs are arranged at equal intervals along the circumferential direction of the adjusting piston, and one end of the plurality of adjusting springs is respectively connected to the root of the inner electrode, and the other end is respectively connected to the adjusting piston.
[0014] Optionally, the regulating piston is made of beryllium bronze material.
[0015] It can be seen from the above technical solution that the pressure compensation array laterolog logging tool provided by the utility model has the following advantages:
[0016] The device sets an oil leakage hole on the outer electrode. When the regulating piston moves toward the regulating spring under the pressure of silicone oil and compresses the regulating spring to the limit state, the silicone oil can be leaked through the oil leakage hole, thereby realizing emergency pressure relief of silicone oil and reducing the risk of damage to the logging instrument. At the same time, by setting a storage ring groove, when the regulating spring is about to be compressed to the limit state, a part of the silicone oil can enter the storage ring groove, thereby realizing the initial buffer pressure relief of the silicone oil and improving the pressure compensation adjustment effect.
[0017] Other features and advantages of the present invention will be described in the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.
[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;
[0020] Figure 2 for Figure 1 A magnified schematic diagram of area A in the middle.
[0021] Description of reference numerals:
[0022] 1. Instrument body; 2. Inner electrode; 3. Outer electrode; 4. Piston ring cavity; 5. Adjusting piston; 6. Adjusting spring; 7. Oil drain hole; 8. Oil drain ring groove; 9. Sealing part; 10. Sealing ring; 11. Sealing ring; 12. Storage ring groove; 13. Balance ring groove; 14. Buffer ring groove. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the utility model can be combined with each other arbitrarily without conflict.
[0024] like Figure 1 , Figure 2 The figure shows an embodiment of the utility model, in which a pressure-compensated array lateral logging instrument is disclosed, including an instrument body 1, on which a cylindrical inner electrode 2 and an outer electrode 3 are arranged, the outer electrode 3 is located on the outside of the inner electrode 2, and the two are coaxial, and at the same time, a piston ring cavity 4 is formed between the inner electrode 2 and the outer electrode 3.
[0025] In one embodiment, Figure 1 , Figure 2 As shown, an adjusting piston 5 is slidably connected in the piston ring cavity 4, and a plurality of adjusting springs 6 are arranged in the piston ring cavity 4, and the plurality of adjusting springs 6 are arranged at equal intervals along the circumferential direction of the adjusting piston 5. One end of the plurality of adjusting springs 6 is respectively connected to the root of the inner electrode 2, and the other end is respectively connected to the adjusting piston 5, and is used to jointly push the adjusting piston 5 to slide.
[0026] In one embodiment, Figure 1 , Figure 2As shown, the outer electrode 3 is provided with an oil drain hole 7 connected with the piston ring cavity 4, and the outer wall of the outer electrode 3 away from the end of the adjusting spring 6 is provided with an oil drain ring groove 8, and the oil drain ring groove 8 is arranged along the circumferential direction of the adjusting piston 5. When the adjusting piston 5 moves toward the adjusting spring 6 under the pressure of the silicone oil and compresses the adjusting spring 6 to the limit state, the oil drain ring groove 8 is connected with the oil drain hole 7.
[0027] The pressure-compensating array lateral logging instrument in this embodiment has an oil drain hole 7 on the outer electrode 3. When the adjusting piston 5 moves toward the adjusting spring 6 under the pressure of the silicone oil and compresses the adjusting spring 6 to the limit state, the silicone oil can leak out through the oil drain hole 7, thereby achieving emergency pressure relief of the silicone oil and reducing the risk of damage to the logging instrument.
[0028] In one embodiment, Figure 1 , Figure 2 As shown, a sealing portion 9 is provided inside the oil leakage hole 7 to seal the oil leakage hole 7, and the sealing portion 9 is interference fit with the oil leakage hole 7 to achieve protection and shielding of the oil leakage hole 7. The sealing portion 9 can be a plug or a countersunk nail. When the regulating piston 5 moves toward the regulating spring 6 under the pressure of the silicone oil and compresses the regulating spring 6 to the limit state, the silicone oil can push the sealing portion 9 out of the oil leakage hole 7 to open the oil leakage hole 7.
[0029] In one embodiment, Figure 1 , Figure 2 As shown, a pair of elastic sealing rings 10 are embedded in the outer wall of the regulating piston 5 to achieve sealing between the regulating piston 5 and the outer electrode 3. The pair of sealing rings 10 are respectively located between the regulating spring 6 and the oil leakage ring groove 8, and the pair of sealing rings 10 are distributed on both sides of the oil leakage hole 7. When the regulating piston 5 moves toward the regulating spring 6 under the pressure of silicone oil and compresses the regulating spring 6 to the limit state, the sealing ring 10 away from one end of the regulating spring 6 passes over the oil leakage hole 7, and at this time, the oil leakage ring groove 8 is connected with the oil leakage hole 7.
[0030] In one embodiment, Figure 1 , Figure 2 As shown, a pair of elastic sealing rings 11 are embedded in the inner wall of the regulating piston 5 to achieve sealing between the regulating piston 5 and the inner electrode 2. The pair of sealing rings 10 and the pair of sealing rings 11 are distributed at intervals, and the side close to the regulating spring 6 is the sealing ring 11, and the side close to the oil leakage ring groove 8 is the sealing ring 10. The staggered distribution of the sealing rings 11 and 10 can ensure the wall thickness of the regulating piston 5, thereby ensuring the structural strength of the regulating piston 5.
[0031] In one embodiment, Figure 1 , Figure 2As shown, a storage ring groove 12 is provided on the inner electrode 2, and the storage ring groove 12 is arranged along the circumferential direction of the inner electrode 2, and a balance ring groove 13 is provided on the inner side wall of the regulating piston 5 away from the end of the regulating spring 6. When the regulating piston 5 moves toward the regulating spring 6 and the regulating spring 6 is about to be compressed to the limit state, the balance ring groove 13 is connected with the storage ring groove 12, so that the silicone oil can enter the storage ring groove 12 to achieve the initial pressure relief of the silicone oil. At this time, the oil leakage ring groove 8 is not connected with the oil leakage hole 7. That is, before the silicone oil is urgently relieved, a part of the silicone oil can enter the storage ring groove 12 to achieve initial pressure relief. If the pressure of the silicone oil continues to increase, emergency pressure relief is performed to improve the pressure compensation regulation effect.
[0032] In one embodiment, Figure 1 , Figure 2 As shown, a buffer ring groove 14 is provided on the outer wall of the regulating piston 5 near one end of the regulating spring 6, and the buffer ring groove 14 is arranged along the circumferential direction of the regulating piston 5 to reduce the contact area between the regulating piston 5 and the outer electrode 3, thereby improving the movement smoothness of the regulating piston 5.
[0033] In this embodiment, the regulating piston 5 is made of beryllium bronze material, and the sealing ring 11 and the sealing ring 10 are made of high-temperature resistant rubber material.
[0034] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the present invention should have the common meanings understood by technicians in the field to which the present invention belongs.
[0035] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is more than two, unless otherwise clearly and specifically limited.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it; although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and description of the utility model. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The utility model is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A pressure-compensated array laterolog logging instrument, comprising an instrument body (1), wherein the instrument body (1) is provided with an inner electrode (2) and an outer electrode (3), wherein a piston ring cavity (4) is formed between the inner electrode (2) and the outer electrode (3), wherein an adjustment spring (6) and an adjustment piston (5) are arranged in the piston ring cavity (4), characterized in that: The outer electrode (3) is provided with an oil drain hole (7) connected to the piston ring cavity (4); the outer wall of the outer electrode (3) away from the end of the regulating spring (6) is provided with an oil drain ring groove (8), and the oil drain ring groove (8) is arranged along the circumferential direction of the regulating piston (5); when the regulating piston (5) moves toward the regulating spring (6) under the pressure of silicone oil and compresses the regulating spring (6) to the limit state, the oil drain ring groove (8) is connected to the oil drain hole (7).
2. The pressure-compensated array laterolog logging tool according to claim 1, characterized in that: A sealing portion (9) is provided inside the oil leakage hole (7) to seal it, and the sealing portion (9) is interference fit with the oil leakage hole (7).
3. The pressure-compensated array laterolog logging tool according to claim 1, characterized in that: A pair of elastic sealing rings (10) are provided on the outer side wall of the regulating piston (5) to achieve sealing between the regulating piston (5) and the outer electrode (3); the pair of sealing rings (10) are respectively located between the regulating spring (6) and the oil drain ring groove (8), and the pair of sealing rings (10) are distributed on both sides of the oil drain hole (7).
4. The pressure-compensated array laterolog logging tool according to claim 3, characterized in that: A pair of elastic sealing rings (11) are provided on the inner side wall of the regulating piston (5) to achieve sealing between the regulating piston (5) and the inner electrode (2).
5. The pressure-compensated array laterolog logging tool according to claim 4, characterized in that: A pair of sealing rings (10) and a pair of sealing rings (11) are spaced apart from each other, and the sealing ring (11) is located on the side close to the adjusting spring (6), and the sealing ring (10) is located on the side close to the oil drain ring groove (8).
6. The pressure-compensated array laterolog logging tool according to claim 5, characterized in that: A storage ring groove (12) is provided on the inner electrode (2), and the storage ring groove (12) is arranged along the circumferential direction of the inner electrode (2). A balance ring groove (13) is provided on the inner side wall of the regulating piston (5) away from the end of the regulating spring (6). When the regulating piston (5) moves toward the regulating spring (6) and the balance ring groove (13) is connected to the storage ring groove (12), silicone oil can enter the storage ring groove (12) to achieve initial pressure relief of the silicone oil. At this time, the oil leakage ring groove (8) is not connected to the oil leakage hole (7).
7. The pressure-compensated array laterolog logging tool according to claim 1, characterized in that: A buffer ring groove (14) is provided on the outer side wall of the regulating piston (5) close to one end of the regulating spring (6), and the buffer ring groove (14) is arranged along the circumferential direction of the regulating piston (5).
8. The pressure-compensated array laterolog logging tool according to claim 1, characterized in that: A plurality of the regulating springs (6) are provided, and the plurality of regulating springs (6) are arranged at equal intervals along the circumferential direction of the regulating piston (5), and one end of the plurality of regulating springs (6) is respectively connected to the root of the inner electrode (2), and the other end is respectively connected to the regulating piston (5).
9. The pressure-compensated array laterolog logging tool according to claim 1, characterized in that: The regulating piston (5) is made of beryllium bronze material.