A well logging device

Abstract

The present invention discloses a well logging device that solves technical problems such as high operating costs and large subsequent maintenance workload for well logging devices. The device includes an upper joint, a tension detection short joint, an intermediate joint, and a lower joint. The intermediate joint is provided with a temperature probe and a mud resistivity probe. The tension detection short joint includes a support tube, an inner core tube, a tension and pressure test bridge, an outer casing, a stop ring, a limiting ring, a balance ring groove, and a balance hole. The distance between the limiting ring and the upper joint and the stop ring is less than 2 mm. A balance ring cavity is formed between the limiting ring, the support tube, the intermediate joint, and the outer casing. The distance between the inner side wall of the outer casing and the bottom of the balance ring groove is equal to the sum of the distance between the outer side wall of the support tube and the bottom of the balance ring groove and the distance between the outer side wall of the bottom position of the upper joint and the outer side wall of the support tube, so as to offset the mud force along the axial direction of the support tube. The present invention can reduce the operating cost of the well logging device and reduce the subsequent maintenance workload.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas well logging, and particularly relates to a logging device. Background Art

[0002] Currently, the development of offshore oil and gas resources is a hot topic and a key focus of global marine economic development. Marine oil and gas resources are not only vast in reserves, but modern science and technology have enabled their development. The offshore oil and gas industry has become a leading, emerging sector in the marine economy with high output value. Well logging equipment, used to detect oil and gas wells, can effectively collect a variety of physical information from the underground environment, such as mechanical, thermal, and nuclear data, and is of great significance to oil exploration and development.

[0003] The logging device in the related art usually includes a main body pup joint, on which a tension detection pup joint is provided. In order to realize the detection of tension and pressure during temperature and mud resistivity logging, a temperature detection pup joint and a mud resistivity detection pup joint are usually additionally provided at the bottom of the main body pup joint.

[0004] Currently, tension logging subs typically utilize oil-balanced tension probes. These are expensive, complex to operate, and require significant maintenance. Furthermore, the addition of temperature and mud resistivity subs increases the overall length of the logging system, making operation and transportation more complex and requiring further improvement. Summary of the Invention

[0005] In order to solve all or part of the above problems, the purpose of the present invention is to provide a logging device that can reduce the cost of use, improve the convenience of operation, reduce the workload of subsequent maintenance, and at the same time shorten the overall length of the logging device, thereby facilitating the staff's operation and transportation of the logging device.

[0006] The present invention provides a well logging device, comprising an upper joint, a tension detection nipple, an intermediate joint, and a lower joint, which are sequentially connected from top to bottom. The upper joint is provided with a quick-screw nut, and the quick-screw nut is used to connect to an external device. The intermediate joint is provided with a temperature probe and a mud resistivity probe.

[0007] The tension detection sub includes:

[0008] A support cylinder, the top of which is connected to the upper joint, and the bottom of which is connected to the middle joint;

[0009] An inner core cylinder, coaxially fixed in the support cylinder;

[0010] A tension pressure test bridge is provided on the outer side wall of the inner core tube, and a buffer gap is formed between the bridge and the inner side wall of the support tube;

[0011] An outer protective tube is sleeved on the support tube, and the bottom of the outer protective tube is threadedly connected to the middle joint;

[0012] A stop ring is sleeved on the support tube and is integrally connected to the support tube;

[0013] A limiting ring is integrally formed and arranged on the top of the outer casing and sleeved on the support tube. The limiting ring is located between the upper joint and the stop ring, and the distance between the limiting ring and the upper joint and the stop ring is less than 2 mm.

[0014] A balancing ring groove is provided on the support tube, and a balancing ring cavity is formed between the limit ring, the support tube, the middle joint and the outer casing;

[0015] a balancing hole, provided on the outer casing and connected to the balancing ring cavity;

[0016] The distance L1 between the inner wall of the outer casing and the bottom of the balance ring groove is equal to the sum of the distance L2 between the outer wall of the support tube and the bottom of the balance ring groove and the distance L3 between the outer wall of the bottom position of the upper joint and the outer wall of the support tube, so as to offset the mud force along the axial direction of the support tube, thereby achieving pressure balance.

[0017] Optionally, a first mounting hole and a second mounting hole are provided on the intermediate joint, the first mounting hole and the second mounting hole are arranged at an interval of 180°, the temperature probe is arranged in the first mounting hole, and the mud resistivity probe is arranged in the second mounting hole. The intermediate joint is provided with a mud disturbance groove connected to the second mounting hole to promote the flow of mud around the mud resistivity probe during logging, thereby improving measurement accuracy.

[0018] Optionally, a rotating sleeve on the intermediate joint is provided with a protective sleeve capable of shielding the temperature probe and the mud resistivity probe, and a first clearance hole and a second clearance hole are provided on the protective sleeve. When the first clearance hole is aligned with the temperature probe, the second clearance hole is aligned with the mud resistivity probe, so that the temperature probe and the mud resistivity probe can be exposed at the same time.

[0019] Optionally, a limit screw is threadedly connected to the protective sleeve, an opening slot and a closing slot are provided on the intermediate joint, and the limit screw can be threadedly connected to the opening slot or the closing slot;

[0020] When the limit screw is threadedly connected to the opening slot, the first clearance hole is aligned with the temperature probe, and the second clearance hole is aligned with the mud resistivity probe, so that the temperature probe and the mud resistivity probe can be exposed at the same time;

[0021] When the limit screw is threadedly connected to the closing groove, the first clearance hole is misaligned with the temperature probe, and the second clearance hole is misaligned with the mud resistivity probe, so that the protective cover can shield and protect the temperature probe and the mud resistivity probe at the same time.

[0022] Optionally, the top of the support tube is inserted into the lower port of the upper joint and threadedly connected to the upper joint, the bottom of the support tube is inserted into the upper port of the intermediate joint and threadedly connected to the intermediate joint, and the bottom of the intermediate joint is inserted into the upper port of the lower joint and threadedly connected to the lower joint.

[0023] Optionally, the lower end of the upper joint is threadedly connected to a plurality of limit screws, the outer side wall of the support tube is provided with an annular stop groove, and the plurality of limit screws can be respectively inserted into the stop groove.

[0024] Optionally, annular mounting grooves are respectively provided at both ends of the support tube and the lower end of the intermediate joint, and a sealing member is embedded in each of the mounting grooves. The sealing member can be tightly abutted against the inner side walls of the upper joint, the intermediate joint and the lower joint to achieve sealing between the upper joint, the support tube, the intermediate joint and the lower joint.

[0025] Optionally, each of the sealing members comprises a sealing retainer and a sealing ring, wherein the sealing retainer is made of polymer engineering plastic, and the sealing ring is made of elastic material, the sealing ring is in close contact with the corresponding sealing retainer, and the inner edges thereof are respectively embedded in the corresponding mounting grooves;

[0026] The sealing ring is provided with a notch, and the sealing ring has a C-shaped structure. The two end faces of the sealing ring located at the notch are respectively composed of a straight surface and an inclined surface. The two straight surfaces and the two inclined surfaces are respectively parallel, and the straight surfaces are arranged along the radial direction of the sealing ring.

[0027] Optionally, a side wall of the sealing ring is provided with an annular positioning groove, and one side of the sealing ring is embedded in the corresponding positioning groove.

[0028] Optionally, the logging device further includes an upper protective cap and a lower protective cap, the upper protective cap is sleeved on the top of the upper joint and can be threadedly connected to the quick-screw nut, and the lower protective cap is movably inserted into the lower port of the lower joint and threadedly connected to the lower joint.

[0029] Optionally, the outer side wall of the upper joint is provided with a first annular groove, two first O-rings are embedded in the first annular groove, the two first O-rings abut against each other and respectively abut tightly against the inner side wall of the upper protective cap, so as to achieve sealing between the upper joint, the upper protective cap and the external device;

[0030] The outer side wall of the lower protective cap is provided with a second annular groove, in which a second O-ring is embedded. The second O-ring is in close contact with the inner side wall of the lower joint to achieve sealing between the lower joint and the lower protective cap.

[0031] It can be seen from the above technical solution that the well logging device provided by the present invention has the following advantages:

[0032] By optimizing the tension test sub structure and pressure balance method, this logging device replaces the original oil-filled pressure balance method with an area-equivalent pressure balance method, achieving the same pressure balance effect while reducing operating costs, improving operational convenience, and reducing maintenance workload. Furthermore, the device directly mounts the temperature probe and mud resistivity probe on the intermediate joint, effectively shortening the overall length of the logging device and facilitating its operation and transportation.

[0033] Other features and advantages of the present invention will be set forth in the description that follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide a further understanding of the technical solution of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention and do not constitute a limitation to the technical solution of the present invention.

[0035] Figure 1 Schematic diagram of the overall structure of the well logging device in an embodiment of the present invention;

[0036] Figure 2 is a cross-sectional view of a well logging device according to an embodiment of the present invention;

[0037] Figure 3 is a cross-sectional view of a tension detection sub in an embodiment of the present invention;

[0038] Figure 4 This is a cross-sectional view of a tension detection sub in an embodiment of the present invention, mainly showing its stress state in mud;

[0039] Figure 5 is a cross-sectional view of an intermediate joint in an embodiment of the present invention;

[0040] Figure 6 This is a schematic structural diagram of a sealing member in an embodiment of the present invention;

[0041] Figure 7 This is a front view of the sealing ring in an embodiment of the present invention;

[0042] Figure 8 is a cross-sectional view of an upper joint according to an embodiment of the present invention;

[0043] Figure 9 2 is a cross-sectional view of the lower joint in an embodiment of the present invention.

[0044] Description of reference numerals:

[0045] 1. Upper joint; 2. Tension detection sub; 201. Support tube; 202. Inner core tube; 203. Tension and pressure test bridge; 204. Buffer gap; 205. Outer casing; 206. Retaining ring; 207. Limiting ring; 208. Balancing ring groove; 209. Balancing ring cavity; 210. Balancing hole; 3. Middle joint; 4. Lower joint; 5. Quick-screw nut; 6. Upper plug; 7. Lower plug; 8. Temperature probe; 9. Mud resistivity probe; 10. First installation Hole; 11. Second mounting hole; 12. Mud disturbance groove; 13. Protective sleeve; 14. First clearance hole; 15. Second clearance hole; 16. Limit screw; 17. Limit top screw; 18. Retraction groove; 19. Seal; 191. Sealing ring; 192. Sealing ring; 193. Notch; 27. Positioning groove; 20. Mounting groove; 21. Upper protective cap; 22. Lower protective cap; 23. First ring groove; 24. First O-ring; 25. Second ring groove; 26. Second O-ring. DETAILED DESCRIPTION

[0046] To make the purpose, technical solutions and advantages of the present invention more clearly understood, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other in any manner.

[0047] like Figures 1-9 The figure shows an embodiment of the present invention, which discloses a well logging device comprising, connected in order from top to bottom, an upper joint 1, a tension detection sub 2, an intermediate joint 3, and a lower joint 4. A quick-screw nut 5 is rotatably mounted on the upper joint 1 and is used to connect to an external device. An upper plug 6 is provided at the top of the upper joint 1, and a lower plug 7 is disposed within the lower joint 4. The lower plug 7 is fixed to the intermediate joint 3. The upper plug 6 and the lower plug 7 are respectively used to connect to external terminals. Furthermore, a temperature probe 8 and a mud resistivity probe 9 are provided on the intermediate joint 3 to measure mud temperature and mud resistivity.

[0048] In one embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, the tension detection sub 2 includes a vertically arranged support tube 201, the top of which is connected to the upper joint 1 and the bottom to the middle joint 3. An inner core tube 202 is coaxially fixedly connected to the interior of the support tube 201. A tension-pressure test bridge 203 is fixedly connected to the outer wall of the inner core tube 202, and a buffer gap 204 is formed between the tension-pressure test bridge 203 and the inner wall of the support tube 201.

[0049] In one embodiment, Figure 3 、 Figure 4 As shown, an outer casing 205 is sleeved on the support tube 201, and the bottom of the outer casing 205 is sleeved on the intermediate joint 3 and threadedly connected to the intermediate joint 3. A stop ring 206 is integrally formed on the support tube 201, and a limit ring 207 is integrally formed on the top of the outer casing 205. The limit ring 207 is sleeved on the support tube 201 and is located between the upper joint 1 and the stop ring 206. The distance between the limit ring 207 and the upper joint 1 and the stop ring 206 is less than 2 mm.

[0050] In one embodiment, Figure 3 、 Figure 4 As shown, a balancing ring groove 208 is provided along the circumference of the outer wall of the support tube 201, and a balancing ring cavity 209 is formed between the limit ring 207, the support tube 201, the intermediate joint 3, and the outer casing 205. At the same time, a plurality of balancing holes 210 are evenly provided on the outer casing 205. The plurality of balancing holes 210 are respectively connected to the balancing ring cavity 209, so that mud liquid can enter the balancing ring cavity 209 through the plurality of balancing holes 210.

[0051] In this embodiment, the distance L1 between the inner sidewall of the outer casing 205 and the bottom of the balance ring groove 208 is equal to the sum of the distance L2 between the outer sidewall of the support tube 201 and the bottom of the balance ring groove 208 and the distance L3 between the outer sidewall of the bottom position of the upper joint 1 and the outer sidewall of the support tube 201, so as to offset the mud force along the axial direction of the support tube 201, thereby achieving pressure balance. The pressure balance principle is as follows:

[0052] Reference Figure 4When the logging device is put into the well, the mud enters the gap between the upper joint 1 and the limit ring 207. At this time, the mud generates a vertical upward force F1 on the upper joint 1 and a vertical downward force F2 on the limit ring 207. During this process, after the mud enters the balance ring cavity 209, the mud generates a vertical upward force F3 on the stop ring 206, and at the same time generates a vertical upward force F4 on the top inner wall of the balance ring groove 208. At the same time, the mud enters the gap between the stop ring 206 and the outer casing 205 and enters between the limit ring 207 and the stop ring 206. The mud generates a vertical upward force F5 on the limit ring 207 and a vertical downward force F6 on the stop ring 206. Since the force F3 and the force F6 cancel each other out, and the force F2 and the force F5 cancel each other out, the vertical upward mud force F along the support tube 201 is F3. 上 =F1+F2. After the mud enters the balance ring cavity 209, the mud generates a vertical downward force F7 on the middle joint 3 and a vertical downward force F8 on the bottom inner wall of the balance ring groove 208. Therefore, the vertical downward mud force F along the support tube 201 is 下 =F7+F8.

[0053] Since the distance L1 between the inner wall of the outer casing 205 and the bottom of the balance ring groove 208 is equal to the sum of the distance L2 between the outer wall of the support tube 201 and the bottom of the balance ring groove 208 and the distance L3 between the outer wall of the bottom position of the upper joint 1 and the outer wall of the support tube 201, that is, the area between the outer wall of the bottom position of the upper joint 1 and the outer wall of the support tube 201 + the area between the outer wall of the support tube 201 and the bottom of the balance ring groove 208 = the area between the outer wall of the intermediate joint 3 and the outer wall of the support tube 201 + the area of ​​the bottom inner wall of the balance ring groove 208, it can be concluded from the pressure relationship that F1+F2=F7+F8, that is, F 上 =F 下 , so that the mud force along the axial direction of the support tube 201 can be offset, thereby achieving pressure balance. At the same time, due to the buffer gap 204 between the tension and pressure test bridge 203 and the inner sidewall of the support tube 201, the support tube 201 is subjected to the mud force along the radial direction of the tension test sub, and this force is not transmitted to the tension and pressure test bridge 203, thereby ensuring the testing accuracy of the tension and pressure test bridge 203.

[0054] The logging device in this embodiment optimizes the tension test nipple structure and pressure balance method, and replaces the original oil-filled pressure balance method with an area equivalent pressure balance method, thereby achieving the same pressure balance effect, reducing the cost of use, improving the convenience of operation, and reducing the maintenance workload of the logging device.

[0055] In this embodiment, the distances between the limiting ring 207 and the upper joint 1 and the retaining ring 206 are 1.5 mm respectively. This design can also limit the outer casing 205 in the vertical direction to prevent the outer casing 205 from being disengaged, thereby improving the connection stability.

[0056] In this embodiment, the tension and pressure test bridge 203 adopts a Wheatstone bridge, which is a prior art and will not be described in detail herein. Of course, in other embodiments, other forms of test bridges may also be adopted, which will not be listed in detail herein.

[0057] In this embodiment, the upper plug 6 is a 32-pin terminal block, comprising a 32-pin aviation plug, a 32-pin BOLCK connector, and a 32-pin tail clip. The lower plug 7 is a 32-pin terminal block, comprising a 32-pin pressure block and a 32-pin counterclockwise female connector. The terminal blocks used in the upper and lower plugs 6 and 7 are conventional and will not be described in detail here. Of course, other types of terminal blocks may also be used in other embodiments.

[0058] In one embodiment, Figure 2 、 Figure 5 As shown, the intermediate joint 3 is provided with a first mounting hole 10 and a second mounting hole 11, which are arranged 180 degrees apart. The temperature probe 8 is fixedly mounted in the first mounting hole 10, and the mud resistivity probe 9 is fixedly mounted in the second mounting hole 11. Furthermore, the outer wall of the intermediate joint 3 is provided with a mud disturbance groove 12 connected to the second mounting hole 11. This enhances mud flushing and promotes mud flow around the mud resistivity probe 9 during well logging, thereby improving measurement accuracy.

[0059] In one embodiment, Figure 2 、 Figure 5 As shown, a protective sleeve 13 is rotatably mounted on the intermediate joint 3. Protective sleeve 13 is provided with a first clearance hole 14 and a second clearance hole 15. When the first clearance hole 14 is aligned with the temperature probe 8, the second clearance hole 15 is aligned with the mud resistivity probe 9, allowing both the temperature probe 8 and the mud resistivity probe 9 to be exposed simultaneously. Similarly, when the first clearance hole 14 is misaligned with the temperature probe 8, the second clearance hole 15 is misaligned with the mud resistivity probe 9, thereby shielding and protecting the temperature probe 8 and the mud resistivity probe 9, reducing the risk of collision between the temperature probe 8 and the mud resistivity probe 9 during transportation of the logging apparatus.

[0060] In one embodiment, Figure 1 、 Figure 5As shown, a limit screw 16 is threadedly connected to the protective sleeve 13. The intermediate joint 3 is provided with an opening slot and a closing slot (not shown in the figure), and the limit screw 16 can be threadedly connected to the opening slot or the closing slot. When the limit screw 16 is threadedly connected to the opening slot, the first clearance hole 14 is aligned with the temperature probe 8, and the second clearance hole 15 is aligned with the mud resistivity probe 9, so that the temperature probe 8 and the mud resistivity probe 9 can be simultaneously exposed. When the limit screw 16 is threadedly connected to the closing slot, the first clearance hole 14 is offset from the temperature probe 8, and the second clearance hole 15 is offset from the mud resistivity probe 9, so that the protective sleeve 13 can simultaneously shield and protect the temperature probe 8 and the mud resistivity probe 9.

[0061] In one embodiment, Figure 2 、 Figure 3 As shown, the top of the support tube 201 is inserted into the lower port of the upper joint 1 and is threadedly connected to the upper joint 1. The bottom of the support tube 201 is inserted into the upper port of the intermediate joint 3 and is threadedly connected to the intermediate joint 3. The bottom of the intermediate joint 3 is inserted into the upper port of the lower joint 4 and is threadedly connected to the lower joint 4. At the same time, the lower end of the upper joint 1 is threadedly connected with multiple limiting screws 17. The outer side wall of the support tube 201 is provided with an annular anti-retraction groove 18 along its circumference. The multiple limiting screws 17 can be respectively inserted into the anti-retraction groove 18 to improve the connection stability between the upper joint 1 and the support tube 201.

[0062] In one embodiment, Figure 3 As shown, both ends of the support tube 201 and the lower end of the intermediate joint 3 are respectively provided with annular mounting grooves 20 along their respective circumferences, and a sealing member 19 is respectively embedded in each mounting groove 20, and the sealing member 19 can be tightly abutted against the inner side walls of the upper joint 1, the intermediate joint 3 and the lower joint 4 to achieve sealing between the upper joint 1, the support tube 201, the intermediate joint 3 and the lower joint 4.

[0063] In one embodiment, Figure 3 、 Figure 6 As shown, each sealing member 19 includes a sealing ring 191 and a sealing ring 192. The sealing ring 191 is made of polymer engineering plastic, and the sealing ring 192 is made of elastic material. The sealing ring 192 is tightly abutted against the corresponding sealing ring 191. At the same time, the inner edge positions of the sealing ring 192 and the sealing ring 191 are respectively embedded in the corresponding mounting groove 20, and the outer edge positions can be tightly abutted against the inner side wall of the upper joint 1, the middle joint 3 or the lower joint 4.

[0064] In one embodiment, Figure 6 、 Figure 7As shown, a notch 193 is provided on the sealing ring 191, and the sealing ring 191 is formed into a C-shaped structure to facilitate the installation of the sealing ring 191. The two end surfaces of the sealing ring 191 located at the notch 193 are respectively composed of a straight surface and an inclined surface. The two straight surfaces and the two inclined surfaces are respectively parallel, and the straight surface of the sealing ring 191 is arranged along the radial direction of the sealing ring 191.

[0065] In one embodiment, Figure 6 、 Figure 7 As shown, the side wall of the sealing ring 191 is provided with an annular positioning groove 27 along its circumference, and one side of the sealing ring 192 is embedded in the corresponding positioning groove 27, thereby realizing the limiting between the sealing ring 191 and the sealing ring 192, so as to improve the connection stability between the sealing ring 191 and the sealing ring 192.

[0066] The sealing method of sealing ring 191 + sealing ring 192 not only improves the sealing effect, but also ensures the heat and pressure resistance of seal 19, allowing the logging device to operate stably in ultra-high temperature and high pressure environments, improving the operational stability of the logging device. Furthermore, the specially designed cutout 193 of sealing ring 191 improves the structural stability of sealing ring 191 and ensures the tight contact between sealing ring 191 and the component, thereby ensuring the sealing effect.

[0067] In this embodiment, the sealing ring 191 can be made of spring steel, and the sealing ring 192 can be made of heat-resistant rubber. Of course, in other embodiments, the sealing ring 191 and the sealing ring 192 can also be made of other materials. Furthermore, the sealing member 19 can be added between the temperature probe 8 and the intermediate joint 3, between the mud resistivity probe 9 and the intermediate joint 3, or between two adjacent components to improve the sealing effect between the two components, thereby improving the temperature and pressure resistance of the logging device, enabling the logging device to operate stably in harsh environments.

[0068] In one embodiment, Figure 2 、 Figure 8 、 Figure 9 As shown, the logging device also includes an upper protective cap 21 and a lower protective cap 22. The upper protective cap 21 is sleeved on the top of the upper joint 1 and can be threadedly connected to the quick-screw nut 5. The lower protective cap 22 is movably inserted into the lower port of the lower joint 4 and threadedly connected to the lower joint 4, thereby protecting the upper plug 6 and the lower plug 7.

[0069] In one embodiment, Figure 8As shown, the outer wall of the upper connector 1 is circumferentially provided with a first annular groove 23. Two first O-rings 24 are embedded within this groove. These two first O-rings 24 abut against each other and the inner wall of the upper protective cap 21, respectively, to achieve a seal between the upper connector 1, the upper protective cap 21, and external devices. The use of a double O-ring mechanical seal interface, replacing the traditional single-pass seal structure, effectively improves sealing effectiveness while also enhancing temperature and pressure resistance to ensure the proper operation of the logging device.

[0070] In one embodiment, Figure 9 As shown, the outer wall of the lower protective cap 22 is provided with a second annular groove 25, and a second O-ring 26 is embedded in the second annular groove 25, and the second O-ring 26 is tightly abutted against the inner wall of the lower joint 4 to achieve sealing between the lower joint 4 and the lower protective cap 22, thereby achieving stable protection for the lower plug 7.

[0071] From the above, it can be seen that compared with the existing technology, this logging device can reduce the use cost, improve the operation convenience, reduce the workload of subsequent maintenance, and at the same time shorten the overall length of the logging device, thereby facilitating the staff's operation and transportation of the logging device.

[0072] It should be noted that, unless otherwise specified, the technical or scientific terms used in the present invention should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0073] In addition, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the present invention, "plurality" means more than two, unless otherwise specifically defined.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present invention 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 well logging device, characterized in that: The invention comprises an upper joint (1), a tension detection short joint (2), an intermediate joint (3) and a lower joint (4) which are sequentially connected from top to bottom. The upper joint (1) is provided with a quick-screw nut (5) which is used to connect with an external device. The intermediate joint (3) is provided with a temperature probe (8) and a mud resistivity probe (9). The tension detection sub (2) comprises: A support tube (201), the top of which is connected to the upper joint (1) and the bottom of which is connected to the middle joint (3); An inner core tube (202) is coaxially fixed in the support tube (201); A tension pressure test bridge (203) is provided on the outer side wall of the inner core tube (202) and has a buffer gap (204) between the bridge and the inner side wall of the support tube (201); An outer protective tube (205) is sleeved on the support tube (201) and has a bottom threadedly connected to the middle joint (3); A stop ring (206) is sleeved on the support tube (201) and is integrally connected to the support tube (201); A limiting ring (207) is integrally formed and arranged on the top of the outer protective tube (205), and is sleeved on the support tube (201). The limiting ring (207) is located between the upper joint (1) and the retaining ring (206), and the distances between the limiting ring (207), the upper joint (1) and the retaining ring (206) are all less than 2 mm. A balancing ring groove (208) is provided on the support tube (201), and a balancing ring cavity (209) is formed between the limiting ring (207), the support tube (201), the middle joint (3) and the outer protective tube (205); A balancing hole (210) is provided on the outer casing (205) and is in communication with the balancing ring cavity (209); The distance L1 between the inner wall of the outer casing (205) and the bottom of the balance ring groove (208) is equal to the sum of the distance L2 between the outer wall of the support tube (201) and the bottom of the balance ring groove (208) and the distance L3 between the outer wall at the bottom position of the upper joint (1) and the outer wall of the support tube (201), so as to offset the mud force along the axial direction of the support tube (201), thereby achieving pressure balance.

2. The well logging device according to claim 1, characterized in that: The intermediate joint (3) is provided with a first mounting hole (10) and a second mounting hole (11), the first mounting hole (10) and the second mounting hole (11) are arranged at an interval of 180 degrees, the temperature probe (8) is arranged in the first mounting hole (10), and the mud resistivity probe (9) is arranged in the second mounting hole (11), and the intermediate joint (3) is provided with a mud disturbance groove (12) connected to the second mounting hole (11) to promote the flow effect of mud around the mud resistivity probe (9) during well logging, thereby improving measurement accuracy.

3. The well logging device according to claim 2, characterized in that: A protective sleeve (13) capable of shielding the temperature probe (8) and the mud resistivity probe (9) is rotatably provided on the intermediate joint (3); a first clearance hole (14) and a second clearance hole (15) are provided on the protective sleeve (13); when the first clearance hole (14) is aligned with the temperature probe (8), the second clearance hole (15) is aligned with the mud resistivity probe (9), so that the temperature probe (8) and the mud resistivity probe (9) can be exposed at the same time.

4. The well logging device according to claim 3, characterized in that: The protective sleeve (13) is threadedly connected with a limit screw (16), the intermediate joint (3) is provided with an opening slot and a closing slot, and the limit screw (16) can be threadedly connected with the opening slot or the closing slot; When the limiting screw (16) is threadedly connected to the opening slot, the first clearance hole (14) is aligned with the temperature probe (8), and the second clearance hole (15) is aligned with the mud resistivity probe (9), so that the temperature probe (8) and the mud resistivity probe (9) can be exposed at the same time; When the limit screw (16) is threadedly connected to the closing groove, the first clearance hole (14) is misaligned with the temperature probe (8), and the second clearance hole (15) is misaligned with the mud resistivity probe (9), so that the protective sleeve (13) can shield and protect the temperature probe (8) and the mud resistivity probe (9) at the same time.

5. The well logging device according to claim 1, characterized in that: The top of the support tube (201) is inserted into the lower port of the upper joint (1) and is threadedly connected to the upper joint (1); the bottom of the support tube (201) is inserted into the upper port of the intermediate joint (3) and is threadedly connected to the intermediate joint (3); the bottom of the intermediate joint (3) is inserted into the upper port of the lower joint (4) and is threadedly connected to the lower joint (4).

6. The well logging device according to claim 5, characterized in that: The lower end of the upper joint (1) is threadedly connected to a plurality of position-limiting top screws (17), and the outer side wall of the support cylinder (201) is provided with an annular anti-retraction groove (18), and the plurality of position-limiting top screws (17) can be respectively inserted into the anti-retraction groove (18).

7. The well logging device according to claim 5, characterized in that: Annular mounting grooves (20) are respectively provided at both ends of the support tube (201) and the lower end of the intermediate joint (3), and a sealing member (19) is respectively embedded in each of the mounting grooves (20), and the sealing member (19) can be tightly abutted against the inner side walls of the upper joint (1), the intermediate joint (3) and the lower joint (4) to achieve sealing between the upper joint (1), the support tube (201), the intermediate joint (3) and the lower joint (4).

8. The well logging device according to claim 7, characterized in that: Each of the sealing members (19) comprises a sealing retainer ring (191) and a sealing ring (192), wherein the sealing retainer ring (191) is made of polymer engineering plastics, and the sealing ring (192) is made of elastic material. The sealing ring (192) is in close contact with the corresponding sealing retainer ring (191), and the inner edges thereof are respectively embedded in the corresponding mounting grooves (20); The sealing retaining ring (191) is provided with a notch (193), and the sealing retaining ring (191) is in a C-shaped structure. The two end faces of the sealing retaining ring (191) located at the notch (193) are respectively composed of a straight surface and an inclined surface. The two straight surfaces and the two inclined surfaces are respectively parallel, and the straight surfaces are arranged along the radial direction of the sealing retaining ring (191).

9. The well logging device according to claim 8, characterized in that: The side wall of the sealing retaining ring (191) is provided with an annular positioning groove (27), and one side of the sealing ring (192) is embedded in the corresponding positioning groove (27).

10. The well logging device according to any one of claims 1 to 9, characterized in that: The logging device further comprises an upper protective cap (21) and a lower protective cap (22), wherein the upper protective cap (21) is sleeved on the top of the upper joint (1) and can be threadedly connected to the quick-screw nut (5), and the lower protective cap (22) is movably inserted into the lower port of the lower joint (4) and threadedly connected to the lower joint (4).

11. The well logging device according to claim 10, characterized in that: The outer side wall of the upper joint (1) is provided with a first annular groove (23), and two first O-rings (24) are embedded in the first annular groove (23). The two first O-rings (24) abut against each other and respectively abut against the inner side wall of the upper protective cap (21) to achieve sealing between the upper joint (1), the upper protective cap (21) and an external device. The outer side wall of the lower protective cap (22) is provided with a second annular groove (25), a second O-ring (26) is embedded in the second annular groove (25), and the second O-ring (26) is in close contact with the inner side wall of the lower joint (4) to achieve sealing between the lower joint (4) and the lower protective cap (22).

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