Novel piston compensation structure
By designing a new piston compensation structure with multiple sets of small piston and piston compensation joints in petroleum logging instruments, the problems of abnormal piston movement and poor risk resistance of traditional instruments in high temperature and high pressure environments are solved, and pressure balance and slurry are achieved Blocking improves the service life and maintenance convenience of the instrument.
Patent Information
- Application Number
- CN202420756744.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-12
AI Technical Summary
In traditional petroleum logging instruments, the pistons are prone to move abnormally due to changes in the volume of silicone oil due to high temperature and high pressure environments, and the single piston has poor risk resistance, which is prone to failure of the instrument due to mud or mudstone, which affects the service life.
Design a new piston compensation structure, including multiple groups of small pistons and piston compensation joints, through threaded connections and sealing ring design, ensure that the piston works stably in a high temperature and high pressure environment, and adjusts the internal and external pressure balance through a pressure relief valve to reduce mud immersion. Improve maintenance convenience.
This design effectively regulates internal and external pressures in high temperature and high pressure environments, reduces mud immersion, and ensures the normal operation of the instrument. Even if some small pistons are stuck, it will not affect the logging. There is no need to consider the life of the spring. Just replace the sealing ring to ensure the sealing. sex.
Smart Images
Figure CN222185308U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of petroleum logging instruments, in particular to a novel piston compensation structure. Background Art
[0002] Under high temperature and high pressure conditions, the volume of the silicone oil in the instrument will change, and the piston will move according to the change in the volume of the oil in the instrument, so that the oil in the instrument always fills the entire instrument.
[0003] If some accident causes the piston to not work properly, resulting in the loss of silicone oil in the instrument, the oil pressure inside and outside the instrument will be unbalanced during logging, causing the instrument to be deformed by force, affecting the service life of the instrument and seriously causing the instrument to be damaged;
[0004] For example, a power drive assembly device for oil well logging instruments with a publication number of "CN209670962U" is used for a power drive assembly device for oil well logging instruments. The independent sealed space of the active unit is an air medium environment, and the driven unit is a balanced oil chamber environment. The balanced oil chamber is automatically balanced with the external pressure environment of the instrument through a balanced piston, which not only meets the requirements of pressure balance inside and outside the oil chamber, but also installs the main power components in the air medium environment, which has higher reliability and better accuracy.
[0005] At present, domestic pressure balance uses springs, which have a certain service life. Due to structural limitations, mud and even mud and stones are easy to enter the piston, causing the piston to get stuck and unable to work normally. At the same time, traditional instruments only have a single piston and have poor risk resistance. In order to avoid some accidents that may cause the piston to fail to work normally.
[0006] Therefore, we proposed a new piston compensation structure that can solve the above problems well. Utility Model Content
[0007] The purpose of the utility model is to provide a novel piston compensation structure to solve the problem that the traditional instrument proposed in the above background technology has only a single piston and has poor risk resistance, so as to avoid the piston from failing to work normally due to some accidents.
[0008] To achieve the above purpose, the utility model provides the following technical solutions: a novel piston compensation structure, including a piston compensation joint, an oil filling plug and a piston, wherein a 75D sealing ring is installed in the middle of the piston and a retaining ring for a hole is installed on the outside;
[0009] A novel piston compensation structure also includes:
[0010] The interior of the piston compensation joint is communicated with the oil circuit of the instrument, and an inner hole is provided inside the piston compensation joint, a piston is placed on the inner wall of the inner hole, and a groove is provided on the outer side of the piston;
[0011] A sealing ring is placed on the inner wall of the groove, a sealing surface is arranged on the outer side of the piston, the hole retaining ring is installed in the groove of the piston compensation joint, and a threaded hole is opened in the middle position of the bottom end of the piston.
[0012] Preferably, the pistons are provided in 15 groups, and the multiple pistons are evenly spaced and distributed at the upper and lower ends of the piston compensation joint.
[0013] Preferably, the sealing surface cooperates with the sealing surface h8 / g8 of the piston compensation joint.
[0014] Preferably, the piston is threadedly connected to the interior of the piston compensation joint through a threaded hole, and the piston can be easily removed by utilizing the design of the threaded hole.
[0015] Preferably, the oil filling plug is installed at the upper end position on the left side inside the piston compensation joint.
[0016] Preferably, the piston is located at the bottom position, and the piston will gradually move upward by replenishing oil, and the sealing ring can well block air and oil, and the sealing ring of 75D conforms to the sports mode.
[0017] Compared with the prior art, the utility model has the following beneficial effects: the new piston compensation structure can meet the situation that the volume of silicone oil in the instrument changes due to environmental changes such as normal temperature and high temperature, normal pressure and high pressure; and the traditional piston compensation method is easy to enter mud, and this scheme can effectively reduce the mud immersion. In addition, this scheme has a total of 15 groups of small pistons. Even if individual small pistons are stuck, other pistons can still work normally to ensure the normal use of the instrument; finally, the piston designed in this scheme is more convenient to maintain, and its specific contents are as follows:
[0018] 1. In the logging state, when the internal and external pressures are unbalanced, the internal and external pressures can be adjusted by moving the piston up and down. When the internal pressure is greater than the external pressure, the piston moves upward to increase the internal space. When the external pressure is greater than the internal pressure, the piston moves downward to reduce the internal space until the internal and external pressures are balanced;
[0019] 2. A pressure relief valve is installed at the other end of the instrument. When the internal pressure is greater than the external pressure and exceeds the maximum compensation amount of the piston, the pressure can be released through the pressure relief valve on the instrument to ensure the balance of internal and external pressures;
[0020] 3. There are many small pistons. Even if some small pistons are stuck accidentally, it will not affect the actual well logging.
[0021] 4. There is no need to consider the service life of the spring. You only need to regularly replace the sealing ring at the small piston to ensure the sealing of the instrument and prevent mud and stones from entering. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1This is a schematic diagram of the front section structure of the utility model;
[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the piston of the utility model;
[0024] Figure 3 This is a schematic diagram of the side section structure of the piston compensation joint of the utility model;
[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the piston compensation joint of the utility model.
[0026] In the figure: 1. Piston compensation joint; 2. Oil filling plug; 3. Piston; 4. Sealing ring; 5. Retaining ring for hole; 6. Sealing surface; 7. Groove; 8. Threaded hole; 9. Inner hole. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] See also Figure 1-Figure 4 The utility model provides the following technical solutions: a new piston compensation structure
[0029] Embodiment 1: In order to solve the problem that the conventional instrument in the prior art has only a single piston 3 and has poor risk resistance, and to avoid the problem that the piston 3 cannot work normally due to some accidents, the following solution is disclosed. Figure 1-Figure 4 As shown, it includes a piston compensation joint 1, an oil filling plug 2 and a piston 3, a 75D sealing ring 4 is installed in the middle of the piston 3, and a hole retaining ring 5 is installed on the outside;
[0030] It also includes: the interior of the piston compensation joint 1 is connected with the oil circuit of the instrument, and an inner hole 9 is opened inside the piston compensation joint 1, a piston 3 is placed on the inner wall of the inner hole 9, and a groove 7 is opened on the outer side of the piston 3; a sealing ring 4 is placed on the inner wall of the groove 7, and a sealing surface 6 is arranged on the outer side of the piston 3, and the sealing surface 6 cooperates with the sealing surface 6h8 / g8 of the piston compensation joint 1, and a hole retaining ring 5 is installed in the groove 7 of the piston compensation joint 1, and a threaded hole 8 is opened in the middle position of the bottom end of the piston 3, and the piston 3 is threadedly connected to the inside of the piston compensation joint 1 through the threaded hole 8. The design of the threaded hole 8 can well remove the piston 3, and the oil filling plug 2 is installed at the upper end position of the left side inside the piston compensation joint 1;
[0031] In the logging state, when the internal and external pressures are unbalanced, the internal and external pressures can be adjusted by moving the piston 3 up and down. When the internal pressure is greater than the external pressure, the piston 3 moves upward to increase the internal space. When the external pressure is greater than the internal pressure, the piston 3 moves downward to reduce the internal space until the internal and external pressures are balanced. Then a pressure relief valve is provided at the other end of the instrument. When the internal pressure is greater than the external pressure and exceeds the maximum compensation amount of the piston 3, the pressure can be relieved through the pressure relief valve on the instrument to ensure the balance of the internal and external pressures.
[0032] Embodiment 2: Different from Embodiment 1, this embodiment uses multiple sets of small pistons 3, so even if individual small pistons 3 are stuck accidentally, it does not affect the actual well logging. Figure 1 , Figure 2 and Figure 4 As shown, 15 groups of pistons 3 are provided, and the multiple pistons 3 are evenly spaced and distributed at the upper and lower ends of the piston compensation joint 1;
[0033] There are many small pistons 3, and even if some small pistons 3 are stuck accidentally, it will not affect the actual well logging. According to the pressure and temperature during well logging, the expansion volume of the silicone oil in the instrument is calculated to determine how many of the 15 groups of pistons 3 are filled with oil and how many are short of oil.
[0034] Embodiment 3: Different from Embodiment 2, this embodiment uses a sealing ring 4 to ensure the sealing of the instrument and prevent mud and stone from entering. Figure 1 and Figure 3 As shown, the piston 3 is at the bottom position, and the piston 3 will gradually move upward by replenishing the oil, and the sealing ring 4 can well block the air and oil, and the sealing ring 4 of 75D conforms to the sports mode;
[0035] There is no need to consider the service life of the spring. It is only necessary to regularly replace the sealing ring 4 at the small piston 3 to ensure the sealing of the instrument and prevent mud and stones from entering.
[0036] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.
[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. A novel piston compensation structure, comprising a piston compensation joint (1), an oil filling plug (2) and a piston (3), wherein a 75D sealing ring (4) is installed in the middle of the piston (3) and a hole retaining ring (5) is installed on the outside; It is characterized in that Also includes: The interior of the piston compensation joint (1) is in communication with the oil circuit of the instrument, and an inner hole (9) is provided inside the piston compensation joint (1), a piston (3) is placed on the inner wall of the inner hole (9), and a groove (7) is provided on the outer side of the piston (3); A sealing ring (4) is placed on the inner wall of the groove (7), a sealing surface (6) is provided on the outer side of the piston (3), the hole retaining ring (5) is installed in the groove (7) of the piston compensation joint (1), and a threaded hole (8) is opened in the middle position of the bottom end of the piston (3).
2. A novel piston compensation structure according to claim 1, characterized in that: The pistons (3) are provided in 15 groups, and the plurality of pistons (3) are distributed at equal intervals at the upper and lower ends of the piston compensation joint (1).
3. A novel piston compensation structure according to claim 1, characterized in that: The sealing surface (6) cooperates with the sealing surface h8 / g8 of the piston compensation joint (1).
4. A novel piston compensation structure according to claim 1, characterized in that: The piston (3) is threadedly connected to the interior of the piston compensation joint (1) via a threaded hole (8). The design of the threaded hole (8) allows the piston (3) to be easily removed.
5. A novel piston compensation structure according to claim 1, characterized in that: The oil filling plug (2) is installed at the upper end position on the left side inside the piston compensation joint (1).
6. A novel piston compensation structure according to claim 1, characterized in that: The piston (3) is located at the bottom, and the piston (3) will gradually move upwards through oil replenishment, and the sealing ring (4) can well block air and oil, and the sealing ring (4) of 75D conforms to the sports mode.