Underground positioning device
By installing a casing and circuit module on the outside of the central tubing, the downhole positioning device uses radio electromagnetic waves to transmit information, solving the problem of inaccurate positioning of fishing tools in existing technologies. This achieves precise positioning of the downhole drilling tool's position and angle, improving the success rate of fishing and operational stability.
Patent Information
- Application Number
- CN202410660631.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-11-28
AI Technical Summary
Existing retrieval tools have difficulty accurately locating the position and angle of downhole drilling tools or instruments during the drilling process, resulting in a low retrieval success rate, especially in complex downhole environments where positioning is inaccurate.
Design a downhole positioning device, including a housing set outside the central tubing and circuit modules evenly distributed along the circumference, transmit information via radio electromagnetic waves to accurately locate the position and angle of the retrieved object, and use a locking device to fix the housing to the central tubing, and integrate an angle sensor and a flow hole to improve measurement accuracy and stability.
It enables precise positioning of the drill string's location and angle in complex downhole environments, improving the success rate of retrieval and enhancing the stability and intelligence of operations.
Smart Images
Figure CN121024583A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of downhole measuring tools, and particularly relates to a downhole positioning device. BACKGROUND
[0002] In the process of drilling, the drilling tools or instruments are often broken due to geological conditions, improper operation or drilling tools, and in order to successfully carry out subsequent drilling operations, the broken drilling tools or instruments in the well are needed to be fished.
[0003] High efficiency, accurate positioning and angle judgment are the keys to successful fishing. Some fishing tools have no positioning device, such as fishing hooks, which may not be fished. The conventional U-shaped buckle is used to put the drill pipe into the buckle and then taken out of the wellhead. In the process of fishing, the bottom of the well cannot be seen, and the positioning cannot be performed, and the fishing can only be performed according to the feeling, and the success rate is low. Some fishing tools are provided with a positioning device, but the positioning device is not sensitive, the downhole environment is complex, the positioning is not accurate, and the operation failure reaction is affected.
[0004] Therefore, it is urgent to develop a fishing positioning device which is stable in structure, reliable in performance and convenient to operate. SUMMARY
[0005] In view of the above technical problems, the present application aims to provide a downhole positioning device which can accurately position the position and angle of the downhole instrument in a harsh drilling environment, and judge the inclination angle of the fishing object relative to the downhole positioning device.
[0006] According to the present application, a downhole positioning device is provided, which is arranged on a center pipe column and comprises:
[0007] An outer shell arranged outside the center pipe column;
[0008] A plurality of circuit modules arranged uniformly in the circumference of the outer shell, the circuit modules being configured to measure the inclination angle of the fishing object relative to the center pipe column; and
[0009] A locking device for fixing the outer shell and the center pipe column.
[0010] In one specific embodiment, a positioning hole is arranged in the lower part of the outer shell, and the positioning hole communicates the circuit modules with the outside of the outer shell.
[0011] In one specific embodiment, a flow-through hole is arranged in the outer shell in the axial direction.
[0012] In one specific embodiment, a plurality of flow-through holes are arranged uniformly in the outer shell in the circumferential direction.
[0013] In one specific embodiment, the flow-through hole is arranged between the circuit module and the central pipe column.
[0014] In one specific embodiment, the housing is coaxially sleeved outside the central pipe column, the upper end of the housing is in axial abutment with the central pipe column, the locking device is fixedly arranged at the lower end of the central pipe column, and the upper end of the locking device is in axial abutment with the lower end of the housing.
[0015] In one specific embodiment, the locking device comprises an upper joint arranged for fixed connection with the central pipe column, and a lower joint arranged at the lower end of the upper joint.
[0016] In one specific embodiment, the circuit module comprises a transmitting coil for transmitting information to a ground positioning instrument in the form of wireless electromagnetic waves.
[0017] In one specific embodiment, when the circuit module detects the fishing object, the indicator light in the corresponding ground positioning instrument is turned on, and the position of the fishing object relative to the central pipe column can be determined according to the order of turning on the indicator light.
[0018] In one specific embodiment, the circuit module comprises an angle sensor for measuring the inclination angle of the central pipe column relative to the ground.
[0019] Compared with the prior art, the application has the following advantages.
[0020] The application is provided with a plurality of circuit modules uniformly distributed in the circumferential direction, when the circuit module detects the fishing object, the indicator light in the corresponding ground positioning instrument is turned on, and the position of the fishing object relative to the central pipe column can be determined according to the order of turning on the indicator light. BRIEF DESCRIPTION OF DRAWINGS
[0021] The application will be described below with reference to the drawings.
[0022] Figure 1 A schematic view of one embodiment of the downhole positioning device according to the application is shown;
[0023] Figure 2 A cross-sectional schematic view of the downhole positioning device according to the application is shown;
[0024] Figure 3 A perspective schematic view of one embodiment of the downhole positioning device according to the application is shown;
[0025] Figure 4A schematic view showing an embodiment of the protective sleeve according to the present application.
[0026] In the drawings:
[0027] 1, housing; 2, positioning hole; 3, locking device; 31, upper joint; 32, lower joint; 4, circuit module; 5, protective sleeve; 6, flow-through hole; 7, central pipe column; 8, position of the circuit module; 100, downhole positioning device.
[0028] In the present application, all the drawings are schematic drawings for illustrating the principles of the present application only and are not drawn to scale. DETAILED DESCRIPTION
[0029] The present application will be described below with reference to the drawings.
[0030] It should be noted that the directional terms or limiting terms "up", "down", "front", "back", "left", "right" and the like used in the present application are all relative to the Figure 1 directions of the drawings. They are not used to limit the absolute positions of the parts involved, but can be changed according to the specific circumstances.
[0031] Figure 1 A structure of a downhole positioning device 100 according to the present application is shown. As shown in the figure, the downhole positioning device 100 comprises a housing 1, a circuit module 4 and a locking device 3 arranged on a central pipe column 7. Figure 1 As shown in the figure, in the present embodiment, the housing 1 is configured to have a generally cylindrical shape as a whole, and the housing 1 is coaxially sleeved on the outside of the central pipe column 7.
[0032] Figures 1 to 3 As shown in the figure, in the present embodiment, the housing 1 is configured to have a generally cylindrical shape as a whole, and the housing 1 is coaxially sleeved on the outside of the central pipe column 7.
[0033] In a preferred embodiment, the housing is composed of an insulating material, which can avoid the attenuation of the transmission signal caused by metal materials.
[0034] A plurality of circuit modules 4 are uniformly arranged in the circumferential direction inside the housing 1, and the circuit modules 4 are configured to be able to measure the inclination angle of the fishing object relative to the central pipe column 7. Specifically, the circuit modules 4 are embedded in the inside of the housing 1, which can avoid the wear of the circuit modules 4 by the objects in the well.
[0035] In a specific embodiment, the circuit modules 4 include a transmission coil that transmits information to the ground positioning instrument in the form of radio electromagnetic waves.
[0036] When the circuit modules 4 detect the fishing object, the indicator light in the corresponding ground positioning instrument will light up, and according to the order of lighting, the circuit module 4 closest to the position of the fishing object can be determined, so as to measure the inclination angle of the fishing object relative to the central pipe column 7.
[0037] According to the application, the circuit module 4 further comprises an angle sensor for measuring the inclination angle of the central pipe column 7 relative to the ground. The inclination angle of the fishing object relative to the central pipe column 7 (the downhole positioning device 100) is determined according to the order of the light-on, the inclination angle of the central pipe column 7 relative to the ground is measured by the angle sensor, and then the inclination angle of the fishing object relative to the ground can be obtained.
[0038] In a preferred embodiment, a unique probe element is designed inside the circuit module 4, including a corner sensor and a digital temperature sensor, which can reliably measure the inclination angle, facing angle and temperature information of the drilling tool while drilling. The measurement results are transmitted to the ground in the form of radio electromagnetic waves, generating a magnetic field distribution similar to a magnetic dipole source for the ground receiving instrument to receive, facilitating the operator to search and position the underground drilling tool.
[0039] In a specific embodiment, 16 circuit modules 4 are uniformly arranged in the circumferential direction in the shell 1, and real-time measurement is performed without dead angle. The application breaks through the limitations of traditional while-drilling measurement fishing devices, integrates the functions of inclination measurement and positioning, solves the two major problems that have plagued underground drilling for a long time, and greatly improves the intelligent level of drilling positioning.
[0040] The locking device 3 fixes the shell 1 and the central pipe column 7, that is, the locking device 3 can connect the shell 1 and the central pipe column 7.
[0041] In a specific embodiment, the locking device 3 comprises an upper joint 31 arranged for fixed connection with the central pipe column 7, and a lower joint 32 arranged at the lower end of the upper joint 31. The shell 1 is coaxially sleeved outside the central pipe column 7, the upper end of the shell 1 axially abuts against the central pipe column 7, the upper joint 31 of the locking device 3 is fixedly arranged at the lower end of the central pipe column 7 by threaded connection, and the upper end of the locking device 3 axially abuts against the lower end of the shell 1. Through this arrangement, the shell 1 is fixedly arranged outside the central pipe column 7 by the locking device 3. Under this arrangement, the shell 1 can be installed on different central pipe columns 7 by the locking device 3.
[0042] The application has a small positioning volume and a simple structure, and the shell 1 is adapted to the central pipe column 7 by the locking device 3, so that it can be installed on the central pipe column 7 of most drilling tools.
[0043] According to the application, in a preferred embodiment, a positioning hole 2 is arranged at the lower part of the shell 1, and the positioning hole 2 communicates the circuit module 4 with the outside of the shell 1. Under this arrangement, the positioning hole 2 can strengthen the signal transmission of the circuit module 4 to the outside, improving the test accuracy.
[0044] In a preferred embodiment, the flow-through holes 6 are arranged axially through the housing 1. By arranging the flow-through holes 6, mud overflow or particle abrasion of the device during the lowering of the downhole positioning device 100 can be prevented.
[0045] In the embodiment, the flow-through holes 6 are arranged uniformly in the circumferential direction in the housing 1. As shown in Figure 2 and Figure 3 In the embodiment, three flow-through holes 6 are arranged in the circumferential direction in the housing 1, and the flow-through holes 6 are arranged between the circuit module 4 and the central pipe column 7, which effectively solves the problems related to mud circulation.
[0046] In a preferred embodiment, a protective sleeve 5 is arranged outside the housing 1 to protect the housing 1.
[0047] During operation, the downhole positioning device 100 is fixed and lowered to the bottom of the well together with the fishing device and the pipe column. During drilling, the state and parameter information of the drilling tool are acquired in real time by the circuit module 4, and positioning and depth are determined according to the signal strength and distribution information, and the results are transmitted to the ground positioning instrument for analysis and processing by the ground technical personnel.
[0048] The circuit module 4 is composed of an angle sensor, a signal processing and transmission unit, a battery, etc., and is used to measure the inclination angle, facing angle and other parameters of the drilling tool. On the one hand, the transmission parameters can be analyzed, and on the other hand, the downhole circuit module 4 can be positioned according to the signal strength distribution. When the downhole positioning device 100 is at the corresponding position of the fishing object, if there is an inclination angle between the downhole positioning device 100 and the fishing object, the circuit module 4 closest to the fishing object will be sensed by the light source and will release a signal to the ground positioning instrument, so that the corresponding facing angle, inclination angle, depth, etc. information can be measured.
[0049] In the description of the present application, it should be understood that the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0050] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0051] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.
[0052] Finally, it should be noted that the above only describes the preferred embodiments of the present application and does not constitute any limitation of the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. A downhole positioning device, mounted on a central tubing string (7), characterized in that, include: The outer casing (1) is disposed outside the central column (7); A plurality of circuit modules (4) are uniformly arranged circumferentially within the outer casing (1), the circuit modules (4) being configured to measure the tilt angle of the salvaged object relative to the central tube column (7); and Locking device (3) fixes the outer shell (1) to the central column (7).
2. The downhole positioning device according to claim 1, characterized in that, A positioning hole (2) is provided at the lower part of the outer casing (1), and the positioning hole (2) connects the circuit module (4) to the outside of the outer casing (1).
3. The downhole positioning device according to claim 1, characterized in that, A flow hole (6) is provided axially through the outer casing (1).
4. The downhole positioning device according to claim 3, characterized in that, Multiple flow holes (6) are evenly arranged in the outer shell (1) along the circumferential direction.
5. The downhole positioning device according to claim 4, characterized in that, The flow hole (6) is disposed between the circuit module (4) and the central column (7).
6. The downhole positioning device according to claim 1, characterized in that, The outer shell (1) is coaxially sleeved on the outside of the central tube column (7). The upper end of the outer shell (1) abuts axially with the central tube column (7). The locking device (3) is fixedly installed at the lower end of the central tube column (7). The upper end of the locking device (3) abuts axially with the lower end of the outer shell (1).
7. The downhole positioning device according to claim 6, characterized in that, The locking device (3) includes an upper connector (31) for fixed connection with the central tube column (7), and a lower connector (32) is provided at the lower end of the upper connector (31).
8. The downhole positioning device according to any one of claims 1 to 7, characterized in that, The circuit module (4) includes a transmitting coil that transmits information to the ground positioning device in the form of radio electromagnetic waves.
9. The downhole positioning device according to claim 8, characterized in that, After the circuit module (4) detects the salvaged object, the indicator light in the corresponding ground positioning instrument will light up. According to the order of the lights, the circuit module (4) that is closest to the salvaged object can be determined, thereby measuring the tilt angle of the salvaged object relative to the central column (7).
10. The downhole positioning device according to claim 9, characterized in that, The circuit module (4) includes an angle sensor for measuring the tilt angle of the central column (7) relative to the ground.