Well logging device

Abstract

The invention discloses a well logging device which solves the technical problems that a well logging device is high in use cost, large in later maintenance workload and the like. The device comprises an upper connector, a tension detection short section, a middle connector and a lower connector, a temperature probe and a slurry resistivity probe are arranged on the middle connector, the tension detection short section comprises a supporting cylinder, an inner core cylinder, a tension and pressure testing bridge, an outer protection cylinder, a retaining ring, a limiting ring, a balance ring groove and a balance hole, and the distance between the limiting ring and the upper connector and the distance between the limiting ring and the retaining ring are both smaller than 2 mm. A balance ring cavity is formed among the limiting ring, the supporting cylinder, the middle connector and the outer protection cylinder, and the distance between the inner side wall of the outer protection cylinder and the groove bottom of the balance ring groove is equal to the sum of the distance between the outer side wall of the supporting cylinder and the groove bottom of the balance ring groove and the distance between the outer side wall of the bottom of the upper connector and the outer side wall of the supporting cylinder. And the slurry acting force in the axial direction of the supporting cylinder is counteracted. The use cost of the logging device can be reduced, and the later maintenance workload is reduced.

Description

Technical Field

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

[0002] Nowadays, the development of marine oil and gas resources is the hot spot and focus of the current world marine economic development. Marine oil and gas resources are not only large in reserves, but modern science and technology have great capabilities for their development. The marine oil and gas industry has developed into a new and high-value-added leading industry in the marine economy. Well logging devices are equipment for detecting oil and gas wells. They can effectively collect a variety of physical information in the underground environment, such as force, heat, nuclear, etc., which is of great significance to oil exploration and development.

[0003] The logging device in the related technology usually includes a main body pup joint, on which a tension detection pup joint is arranged. 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] At present, the tension detection sub in the related technology usually adopts an oil-liquid balance tension probe, which is expensive, complicated to operate, and requires a lot of maintenance work in the later stage. At the same time, the additional temperature detection sub and mud resistivity detection sub increase the overall length of the logging device, and the operation and transportation of the logging device are more troublesome, which needs to be improved. 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 operational 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.

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

[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 arranged on the outer side wall of the inner core tube and has a buffer gap with 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 with 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, wherein the limiting ring is located between the upper joint and the stop ring, and the distances between the limiting ring and the upper joint and the stop ring are all less than 2 mm;

[0014] A balancing ring groove is arranged 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 is provided on the outer casing and is communicated with 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 at 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 provided at an interval of 180°, the temperature probe is provided in the first mounting hole, the mud resistivity probe is provided in the second mounting hole, and a mud disturbance groove connected to the second mounting hole is provided on the intermediate joint to promote the flow effect of mud around the mud resistivity probe during well logging, thereby improving the 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 with 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, the sealing retainer is made of polymer engineering plastic, the sealing ring is made of elastic material, the sealing ring is tightly abutted against the corresponding sealing retainer, and the inner edge position is respectively embedded in the corresponding installation groove;

[0026] The sealing ring is provided with a cutout, and the sealing ring is in a C-shaped structure. The two end faces of the sealing ring located at the cutout are respectively composed of a straight face and an inclined face. The two straight faces and the two inclined faces are respectively parallel, and the straight faces 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 also 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, a second O-ring is embedded in the second annular groove, and the second O-ring is tightly abutted against 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] The logging device optimizes the tension test nipple structure and pressure balance method, and replaces the original oil-filled pressure balance method with the area equivalent pressure balance method, which can achieve the same pressure balance effect, reduce the use cost, improve the convenience of operation, and reduce the maintenance workload of the logging device. At the same time, the logging device directly installs the temperature probe and mud resistivity probe on the middle joint, effectively shortening the overall length of the logging device, thereby facilitating the operation and transportation of the logging device by the staff.

[0033] Other features and advantages of the present invention will be set forth in the description which 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 It is a 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 in an embodiment of the present invention;

[0037] Figure 3 A cross-sectional view of a tension detection subsection according to an embodiment of the present invention;

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

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

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

[0043] Fig. 9 It 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 short section; 201. Support tube; 202. Inner core tube; 203. Tension pressure test bridge; 204. Buffer gap; 205. Outer casing; 206. Stop ring; 207. Limit ring; 208. Balance ring groove; 209. Balance ring cavity; 210. Balance 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 make way hole; 15, second make way hole; 16, limit screw; 17, limit top screw; 18, stop groove; 19, seal; 191, sealing retaining ring; 192, sealing ring; 193, cutout; 19, 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 solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other arbitrarily without conflict.

[0047] like Figure 1-Figure 9 The embodiment of the present invention is shown in the figure. In the embodiment, a logging device is disclosed, including an upper joint 1, a tension detection short joint 2, an intermediate joint 3 and a lower joint 4 connected in sequence from top to bottom. A quick-screw nut 5 is rotatably sleeved on the upper joint 1, and the quick-screw nut 5 is used to connect with an external device. An upper plug 6 is provided on the top of the upper joint 1, a lower plug 7 is provided in the lower joint 4, and 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 with external terminals. At the same time, a temperature probe 8 and a mud resistivity probe 9 are provided on the intermediate joint 3 to realize the measurement of mud temperature and mud resistivity.

[0048] In one embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the tension detection short section 2 includes a vertically arranged support tube 201, the top of the support tube 201 is connected to the upper joint 1, and the bottom is connected to the middle joint 3. An inner core tube 202 is coaxially fixedly connected inside 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 exists 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 middle joint 3 and threadedly connected with the middle 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 the limit ring 207 is located between the upper joint 1 and the stop ring 206, and the distances between the limit ring 207 and the upper joint 1 and the stop ring 206 are all less than 2 mm.

[0050] In one embodiment, Figure 3 , Figure 4 As shown, a balancing ring groove 208 is provided on the outer wall of the support tube 201 along its circumference, and a balancing ring cavity 209 is formed between the limit ring 207, the support tube 201, the middle 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, and the plurality of balancing holes 210 are respectively connected to the balancing ring cavity 209, so that the 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 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 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. The principle of pressure balance 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. In 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 between the limit ring 207 and the stop ring 206 through the gap between the stop ring 206 and the outer casing 205. 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 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 balancing 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 balancing ring groove 208 and the distance L3 between the outer wall at the bottom of the upper joint 1 and the outer wall of the support tube 201, that is, the area between the outer wall at the bottom 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 balancing 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 balancing ring groove 208, it can be obtained according to 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, since there is a buffer gap 204 between the tension test bridge 203 and the inner wall of the support tube 201, the support tube 201 is subjected to the mud force along the radial direction of the tension test short section, and this force will not be transmitted to the tension test bridge 203, so as to ensure the test accuracy of the tension test bridge 203.

[0054] The logging device in this embodiment can achieve the same pressure balance effect by optimizing the tension test short section structure and the pressure balance method, replacing the original oil-filled pressure balance method with the area equivalent pressure balance method, thereby reducing the use cost, improving the operation convenience, 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 stop 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 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 adopts a 32-core wiring plug, which is composed of a 32-core aviation plug, a 32-core BOLCK head, and a 32-core tail clip, and the lower plug 7 adopts a 32-core wiring plug, which is composed of a 32-core pressure block and a 32-core counterclockwise female head, and the like. The wiring plugs selected by the upper plug 6 and the lower plug 7 are all existing technologies, and will not be described in detail here. Of course, in other embodiments, other types of wiring plugs can also be used.

[0058] In one embodiment, Figure 2 , Figure 5 As shown, the middle 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 provided at an interval of 180°, and the temperature probe 8 is fixedly provided in the first mounting hole 10, and the mud resistivity probe 9 is fixedly provided in the second mounting hole 11. At the same time, the outer wall of the middle joint 3 is provided with a mud disturbance groove 12 connected with the second mounting hole 11, so as to enhance the mud flushing effect and promote the flow effect of the mud around the mud resistivity probe 9 during well logging, thereby improving the measurement accuracy.

[0059] In one embodiment, Figure 2 , Figure 5 As shown, a protective sleeve 13 is rotatably provided on the intermediate joint 3, and 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. 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, so as to achieve shielding and protection of the temperature probe 8 and the mud resistivity probe 9, and reduce the risk of collision between the temperature probe 8 and the mud resistivity probe 9 during the transportation of the logging device.

[0060] In one embodiment, Figure 1 , Figure 5As shown, the protective sleeve 13 is threadedly connected with a limit screw 16, and 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 with the opening slot or the closing slot. When the limit screw 16 is threadedly connected with 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 with the closing slot, 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 shields and protects the temperature probe 8 and the mud resistivity probe 9 at the same time.

[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, and 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 a plurality of limit screws 17, and the outer side wall of the support tube 201 is provided with an annular stop groove 18 along its circumference, and the plurality of limit screws 17 can be respectively inserted into the stop 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 middle 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 middle joint 3 and the lower joint 4 to achieve sealing between the upper joint 1, the support tube 201, the middle 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, wherein the sealing 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 ring 191. Meanwhile, 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 in close contact with 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 in a C-shaped structure to facilitate the installation of the sealing ring 191. The two end faces 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 19 along its circumference, and one side of the sealing ring 192 is embedded in the corresponding positioning groove 19, thereby realizing the limiting between the sealing ring 191 and the sealing ring 192 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 can not only improve the sealing effect, but also ensure the temperature and pressure resistance of the sealing element 19, so that the logging device can work stably in an ultra-high temperature and high pressure environment, and improve the use stability of the logging device. In addition, the cutout 193 of the sealing ring 191 adopts a special design to improve the structural stability of the sealing ring 191, ensure the tightness between the sealing ring 191 and the components, and thus ensure 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 temperature-resistant rubber. Of course, in other embodiments, the sealing ring 191 and the sealing ring 192 can also be made of other materials. At the same time, 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, and between two adjacent components to improve the sealing effect between the two components, thereby improving the temperature and pressure resistance of the logging device, so that the logging device can work stably in harsh environments.

[0068] In one embodiment, Figure 2 , Figure 8 , Fig. 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 joint 1 is provided with a first annular groove 23 along its circumference, 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 are respectively tightly abutted against the inner wall of the upper protective cap 21 to achieve sealing between the upper joint 1 and the upper protective cap 21 and the external device. The use of a double O-ring mechanical sealing interface replaces the traditional single-channel sealing structure, which can effectively improve the sealing effect, and at the same time improve the temperature resistance and pressure resistance to ensure the normal use of the well logging device.

[0070] In one embodiment, Fig. 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, the logging device can reduce the use cost, improve the operating convenience, reduce the workload of later 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 terms 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 technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The 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 nipple (2), an intermediate joint (3) and a lower joint (4) which are connected in sequence 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 inside the support tube (201); A tension pressure test bridge (203) is arranged 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 the bottom of the outer protective tube is 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 casing (205), and is sleeved on the support tube (201); the limiting ring (207) is located between the upper joint (1) and the stop ring (206), and the distances between the limiting ring (207) and the upper joint (1) and the stop ring (206) are all less than 2 mm; A balancing ring groove (208) is arranged 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 communicated 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), 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 the measurement accuracy.

3. The logging device according to claim 2, characterized in that: The intermediate joint (3) is rotatably sleeved with a protective sleeve (13) capable of shielding the temperature probe (8) and the mud resistivity probe (9); the 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), 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 groove and a closing groove, and the limit screw (16) can be threadedly connected with the opening groove or the closing groove; When the stop screw (16) is threadedly connected to the opening groove, 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 with a plurality of limit screws (17), the outer side wall of the support tube (201) is provided with an annular stop groove (18), and the plurality of limit screws (17) can be respectively inserted into the stop groove (18).

7. The well logging device according to claim 5, characterized in that: Both ends of the support tube (201) and the lower end of the intermediate joint (3) are respectively provided with annular mounting grooves (20), 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 retaining ring (191) and a sealing ring (192), wherein the sealing retaining ring (191) is made of polymer engineering plastics, and the sealing ring (192) is made of elastic material, and the sealing ring (192) is tightly abutted against the corresponding sealing retaining ring (191), and the inner edge position is respectively embedded in the corresponding installation groove (20); The sealing ring (191) is provided with a cutout (193), so that the sealing ring (191) has a C-shaped structure; the two end faces of the sealing ring (191) located at the cutout (193) are respectively composed of a straight face and an inclined face; the two straight faces and the two inclined faces are respectively parallel, and the straight faces are arranged along the radial direction of the sealing ring (191).

9. The well logging device according to claim 8, characterized in that: The side wall of the sealing ring (191) is provided with an annular positioning groove (19), and one side of the sealing ring (192) is embedded in the corresponding positioning groove (19).

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); 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).

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 are respectively in close contact with the inner side wall of the upper protective cap (21), so as to achieve sealing between the upper joint (1), the upper protective cap (21) and an external device; The outer 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 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).

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