Guiding butt joint for through-drill-bit well logging
By setting guide holes and insertion holes on the connector body, the problem of difficult docking between the upper and lower suspensions is solved, enabling efficient grabbing and retrieval of logging instruments under various well conditions, improving the success rate and ease of operation.
Patent Information
- Application Number
- CN202520186723.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-02-06
AI Technical Summary
In existing technologies, it is difficult to connect the upper and lower suspensions, resulting in a low success rate for logging instruments to retrieve the instruments, especially in the build-up well section and the large well section where successful connection is difficult to achieve.
Design a guide connector for logging through the drill bit, including setting a guide through hole on the connector body. The guide through hole consists of a first hole section and a second hole section. The second hole section is conical and gradually decreases in diameter. Multiple insertion holes are set on the connector body to facilitate the guidance and fixation of the lower suspension connector.
It improves the instrument's grabbing and recovery rate, enables grabbing under various well conditions, is easy to operate, and has high stability and reliability. It overcomes the docking difficulties of conventional interfaces in the build-up well section and the large well deviated section.
Smart Images
Figure CN223794137U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drill bit logging technology, and in particular to a guide connector for drill bit logging. Background Technology
[0002] As global oil and gas exploration and development deepens, traditional logging technologies are increasingly revealing their limitations, particularly in deep wells, ultra-deep wells, and operations under complex geological conditions. Traditional logging methods typically require multiple tripping operations, which is not only time-consuming and labor-intensive but also increases operational risks and costs. Therefore, improving logging efficiency, reducing non-productive time, and mitigating operational risks have become critical issues that the industry urgently needs to address.
[0003] Over-the-bit logging is a new technology that has been developed in recent years. An over-the-bit logging system consists of a set of small-diameter downhole instruments and a set of special tools for over-the-bit logging. It can be used as a small-bore cable logging system for real-time logging data measurement, or it can be used for storage-based over-the-bit logging. It is mainly designed for logging needs of difficult wells and horizontal wells, and is currently a relatively stable and efficient logging method.
[0004] During logging operations through the drill bit, such as Figure 1 As shown, the logging instrument is connected to the lower suspension 200, which is connected to the drill string. When lowering the logging instrument, the upper end of the lower suspension 200 needs to be detachably connected to the upper suspension 100 via a pair of connectors 300. After the logging instrument is lowered to the target area, the upper suspension 100 is separated from the lower suspension 200, and then the upper suspension 100 is raised to the surface. When the measurement is completed or when dealing with complex downhole situations, the instrument needs to be retrieved. That is, the upper suspension 100 (with the connector 300 connected to its lower end) needs to be lowered so that the connector 300 is aligned with the connector at the upper end of the lower suspension 200. Then, the lower suspension 200 (carrying the logging instrument) is raised to the surface via the upper suspension 100. However, due to the poor structural guidance effect of the current connector 300, the success rate of docking between the upper and lower suspensions is generally good in vertical well sections or well inclinations within 20°. However, in special cases such as when there are foreign objects in the mud or at the build-up point, the success rate of docking between the upper and lower suspensions, i.e., the success rate of instrument retrieval, is generally below 50%, which seriously restricts the timeliness of logging operations and the handling of complex working conditions. Therefore, it is urgent to design a scheme that can achieve instrument retrieval and recovery under all well conditions. Summary of the Invention
[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a guide connector for logging through the drill bit, which solves the problem of difficulty in docking the upper and lower suspensions and the low success rate of logging instrument retrieval in the prior art.
[0006] To achieve the above and other related objectives, this utility model provides a guide connector for through-bit logging, comprising a connector body, a first end of which is provided with an external thread, and a guide through hole provided on the connector body. The guide through hole includes a first section and a second section, wherein the first section is located at the first end of the connector body, the second section is located at the second end of the connector body, and the second section is tapered, and the diameter of the second section gradually decreases along the direction from the second end of the connector body to the first end of the connector body, and the diameter of the first section is equal to the minimum diameter of the second section.
[0007] Furthermore, the second end of the connector body is provided with a plurality of insertion holes, and the plurality of insertion holes are evenly spaced along the circumferential direction of the connector body.
[0008] Furthermore, the angle between the sidewall of the second hole segment and the central axis of the second hole segment is 15° to 25°.
[0009] Furthermore, the angle between the sidewall of the second hole segment and the central axis of the second hole segment is 20°.
[0010] Furthermore, the length of the connector body is 9cm-15cm.
[0011] Furthermore, the length of the connector body is 12cm.
[0012] Furthermore, a sealing ring is provided at the first end of the connector body.
[0013] As described above, the guide connector for logging through the drill bit of this utility model has the following beneficial effects: when it is necessary to grab the logging instrument, the first end of the connector body is threadedly connected to the upper suspension, and then the upper suspension is lowered, so that the second end of the connector body gradually approaches the lower suspension located in the well. Since the second hole section located at the second end of the connector body is conical, that is, open trumpet-shaped, the connector at the upper end of the lower suspension can smoothly enter the guide through hole of the connector body, and then enter the interior of the upper suspension through the guide through hole to connect and fix with the connector locking member located inside the upper suspension. Therefore, this guide connector has a perfect guiding and straightening effect when docking the lower and upper suspensions. It can overcome the problem that the lower suspension connector cannot enter the upper suspension interface in the well conditions of the build-up section and the large inclination section. It breaks through the situation that conventional interfaces cannot smoothly guide the lower suspension connector into the upper suspension for grabbing in the build-up section and the well section with an inclination of more than 40°. It greatly improves the grabbing and recovery rate of the instrument. Moreover, the guide connector can basically realize the grabbing and recovery of downhole instruments in all well conditions. It is convenient to use, easy to operate, has good stability and high reliability. Attached Figure Description
[0014] Figure 1 The diagram shows the docking state of the upper and lower suspensions in the prior art provided by this utility model.
[0015] Figure 2 This is a first view of the guide connector for logging through the drill bit provided by this utility model.
[0016] Figure 3 This is a second view of the guide connector for logging through the drill bit provided by this utility model.
[0017] Figure 4 This is a third view of the guide connector for logging through the drill bit provided by this utility model.
[0018] Figure 5 The diagram shown is a cross-sectional view of the guide connector for logging through the drill bit provided by this utility model.
[0019] Explanation of reference numerals in the attached figures
[0020] 10 connector bodies
[0021] 101 Guide Hole
[0022] 1011 First Hole Section
[0023] 1012 Second Hole Section
[0024] 102 External Thread
[0025] 103 socket
[0026] 104 Sealing Ring
[0027] 100 suspended
[0028] 200 Lower suspension
[0029] 300-pair connector Detailed Implementation
[0030] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.
[0031] In the description of this utility model, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] Please see Figures 1 to 5 It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.
[0034] This utility model provides a guide connector for logging through drill bit (hereinafter referred to as "guide connector"), such as... Figures 2 to 5 As shown, the guide connector includes a connector body 10. The first end of the connector body 10 is provided with an external thread 102, that is, the first end of the connector body 10 is used to be threadedly connected to the lower end of the upper suspension 100. The connector body 10 is also provided with a guide through hole 101. The guide through hole 101 includes a first hole section 1011 and a second hole section 1012. Specifically, the first hole section 1011 is located at the first end of the connector body 10, and the second hole section 1012 is located at the second end of the connector body 10. The second hole section 1012 is tapered, and the diameter of the tapered second hole section 1012 gradually decreases from the second end of the connector body 10 to the first end of the connector body 10. The diameter of the first hole section 1011 is equal to the minimum diameter of the second hole section 1012.
[0035] The beneficial effect of the guide connector for over-the-bit logging of this utility model is that when it is necessary to grab the logging instrument, the first end of the connector body 10 is threaded to the upper suspension 100, and then the upper suspension is lowered so that the second end of the connector body 10 gradually approaches the lower suspension 200 located in the well. Since the second hole section 1012 located at the second end of the connector body 10 is conical, that is, open trumpet-shaped, the connector at the upper end of the lower suspension 200 can smoothly enter the guide through hole 101 of the connector body 10, and then enter the upper suspension through the guide through hole 101 to connect and fix with the connector locking member located inside the upper suspension. Therefore, this guide connector has a perfect guiding and straightening effect when docking the lower and upper suspensions. It can overcome the problem that the lower suspension connector cannot enter the upper suspension interface in the well conditions of the build-up section and the large inclination section. It breaks through the situation that conventional interfaces cannot smoothly guide the lower suspension connector into the upper suspension for grabbing in the build-up section and the well section with an inclination of more than 40°. It greatly improves the grabbing and recovery rate of the instrument. Moreover, the guide connector can basically realize the grabbing and recovery of downhole instruments in all well conditions. It is convenient to use, easy to operate, has good stability and high reliability.
[0036] Furthermore, in some embodiments, the angle between the sidewall of the second hole segment 1012 and its central axis is 15° to 25°. Preferably, in this embodiment, the angle between the sidewall of the second hole segment 1012 and its central axis is 20°.
[0037] To improve the sealing performance between the first end of the connector body 10 and the upper suspension connection, preferably, as follows: Figure 2 As shown, in this embodiment, a sealing ring 104 is also provided at the first end of the connector body 10.
[0038] Furthermore, when connecting the connector body 10 to the upper suspension, in order to facilitate the tightening of the connector body 10 onto the upper suspension 100, it is preferable that, Figure 2 As shown, in this embodiment, multiple insertion holes 103 are provided on the circumferential surface of the second end of the connector body 10, and these multiple insertion holes 103 are evenly spaced along the circumferential direction of the connector body 10. With this structural design, when the connector body 10 is screwed on the upward suspension, a screwdriver (e.g., a steel rod) can be inserted into the insertion hole 103, and then the connector body 10 can be rotated by rotating the screwdriver, thereby making it convenient and effortless to tighten the connector body 10 on the upward suspension.
[0039] Specifically, in some embodiments, the length of the connector body 10 is 9cm to 15cm. Preferably, in this embodiment, the length of the connector body 10 is 12cm.
[0040] In summary, the guide connector for logging through the drill bit of this invention features an open flared end near the lower suspension, thereby improving the lower suspension connector's ability to enter the guide through-hole. This overcomes the problem of the lower suspension connector being unable to enter the upper suspension interface in build-up and high-angle well sections. It also breaks through the limitation of conventional interfaces in build-up and well sections with inclinations exceeding 40°, which prevent the lower suspension connector from being smoothly guided into the upper suspension for retrieval. This significantly improves the instrument's retrieval rate. Furthermore, this guide connector enables retrieval of downhole instruments across almost all well conditions. It is convenient to use, easy to operate, stable, and highly reliable. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial application value.
[0041] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.
Claims
1. A pilot sub for use in over-the-bit logging, characterized by, Comprise: The first end of the adapter body is provided with external threads, and a guide through hole is arranged on the adapter body, the guide through hole comprises a first hole section and a second hole section, wherein the first hole section is located at the first end of the adapter body, the second hole section is located at the second end of the adapter body, the second hole section is tapered, and the diameter of the second hole section gradually decreases from the second end of the adapter body to the first end of the adapter body, and the diameter of the first hole section is equal to the minimum diameter of the second hole section.
2. A guide sub for use in over-the-bit logging as defined in claim 1, wherein: A plurality of insertion holes are arranged on the peripheral surface of the second end of the adapter body, and the plurality of insertion holes are uniformly arranged along the circumferential direction of the adapter body.
3. The guide sub of claim 1, wherein: The included angle between the side wall of the second hole section and the central axis of the second hole section is 15°-25°.
4. The guide sub of claim 3, wherein: The included angle between the side wall of the second hole section and the central axis of the second hole section is 20°.
5. The guide sub of claim 1 wherein, The length of the adapter body is 9cm-15cm.
6. A guide sub as claimed in claim 5, characterised in that The length of the adapter body is 12cm.
7. The guide sub of claim 1 wherein, The first end of the adapter body is further provided with a sealing ring.