Test nipple

Abstract

The utility model discloses a test pup joint which comprises a test piece, a drill bit connecting piece and a buffer piece, the test piece is provided with a connecting end and a transmission end, and the connecting end is configured to be connected with a drill rod; one end of the drill bit connecting piece corresponds to the transmission end of the test piece and can move relative to the transmission end so as to be in contact with or away from the transmission end, and the other end of the drill bit connecting piece is configured to be connected with a drilling tool; the buffer piece is connected with the test piece and the drill bit connecting piece and used for providing buffer force acting between the test piece and the drill bit connecting piece. The device not only can measure the dynamic interaction force between the drill bit and the drill rod, but also can effectively buffer the instantaneous impact force generated during the operation of the drill bit and protect the test short section from being damaged.

Description

Technical Field

[0001] This utility model relates to the field of downhole testing sub technology, specifically to a testing sub. Background Technology

[0002] In the exploration and development of resources such as oil and natural gas, drilling operations must monitor the stress state and dynamic behavior of downhole drilling tools in real time to ensure drilling efficiency, extend tool life, and ensure downhole safety. Measurement while drilling (MWD) and logging while drilling (LWD) technologies have been widely used in the field of downhole data acquisition. However, traditional measurement subs can usually only obtain conventional parameters such as drilling pressure, torque, and vibration, and it is difficult to accurately measure the dynamic interaction forces between the drill bit and the drill pipe.

[0003] To address this issue, patent CN109973073A discloses a downhole testing sub for deepwater drilling. This sub consists of an outer cylinder, an inner cylinder, end retaining rings, strain sensors, and an electronic control board. The inner cylinder is connected to the outer cylinder via the end retaining rings, forming an annular space between them. The strain sensor and electronic control board are installed within this annular space. Multiple battery slots are evenly distributed around the circumference of the inner cylinder, where the electronic control board is located, each containing a movable battery. The electronic control board is connected to the batteries and the strain sensor. This downhole testing sub for deepwater drilling connects to the drill pipe and drill string at the upper and lower ends of the inner cylinder, respectively. The strain sensor on the inner cylinder measures the deformation caused by stress. The strain sensor and accelerometer are used to test the stress and movement of the drill string near the drill bit, and the measurement results are recorded and stored on an SD card.

[0004] However, during oil drilling, the interaction between the drill bit and the formation generates severe instantaneous impact loads. The resulting impact force is transmitted upward through the drill string assembly. The current test sub is rigidly connected to the drill pipe and drill string, which cannot effectively buffer the instantaneous impact force generated during drill bit operation. Therefore, the deformation area of ​​the inner cylinder of the test sub is prone to excessive deformation and damage, and may even crack or break, significantly reducing the tool's service life. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a test section to solve the technical problem that the existing test section cannot effectively buffer the instantaneous impact force generated during drill bit operation, which leads to excessive deformation and damage of the deformation area of ​​the inner cylinder of the test section.

[0006] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0007] This utility model provides a test section, comprising: a test piece, a drill bit connector, and a buffer. The test piece has a connecting end and a transmission end. The connecting end is disposed on a drill pipe. One end of the drill bit connector corresponds to the transmission end of the test piece and is movable relative to the transmission end to contact or move away from the transmission end. The other end of the drill bit connector is disposed on a drill string. The buffer connects the test piece and the drill bit connector to provide a buffering force acting between the test piece and the drill bit connector.

[0008] In some embodiments, the test piece includes a test piece body and a detection element, the test piece body having the connecting end and the transmitting end, and the detection element being connected to the test piece body.

[0009] In some embodiments, the measuring element body includes an inner cylinder and an outer shell. An installation groove is provided on the outer side of the inner cylinder, and the detection element is placed in the installation groove. The detection end of the detection element is connected to the side wall of the inner cylinder. The outer shell is sleeved on the outer side of the inner cylinder and covers the installation groove.

[0010] In some embodiments, a seal is provided between the outer shell and the inner cylinder.

[0011] In some embodiments, a protrusion is provided at one end of the drill bit connector corresponding to the transmission end, and a groove is provided at the transmission end of the test piece. The groove matches the protrusion, and the protrusion and the groove restrict the rotation of the protrusion relative to the groove through cooperation.

[0012] In some embodiments, the drill bit connector includes an external threaded joint, a sliding part, and an adjusting part. The external threaded joint is coaxially disposed on one side of the transmission end of the transmission end. The sliding part is fitted onto the outside of the test piece body and the external threaded joint, with one end slidably connected to the external threaded joint. The adjusting part connects the test piece body and the sliding part, and the adjusting part is movable relative to the sliding part.

[0013] In some embodiments, the buffer is a spring disposed between the sliding part and the adjusting part, with one end connected to the test piece through the adjusting part and the other end connected to the external threaded joint through the sliding part. When the external threaded joint is subjected to an external force, the spring can be compressed to buffer the impact of the external force on the test piece.

[0014] In some embodiments, the sliding part includes a guide sleeve and a slider. The guide sleeve is disposed on the outside of the test piece and the external threaded joint, and a groove is formed inside it. The slider is slidably disposed in the groove, and the external threaded joint is connected to the slider.

[0015] In some embodiments, the inner diameter of the slider matches the outer diameter of the test piece, and the length of the slider is greater than or equal to the maximum distance between the test piece and the external threaded connector.

[0016] In some embodiments, the adjusting part includes a threaded sleeve that is fitted with the test piece, and the outer side of the threaded sleeve has external threads, while the inner side of the guide sleeve at the end away from the external threaded connector has an internal thread groove, which is threadedly connected to the external threads.

[0017] Compared with existing technologies, the test section provided by this utility model, through the setting of a test piece, a drill bit connector, and a buffer, achieves stable data transmission through the cooperation of the drill bit connector and the test piece. The detection element of the test piece can accurately acquire the required data, realizing real-time monitoring of mechanical properties during drilling. The buffer can absorb the impact force through its own compression deformation when the drill bit is subjected to instantaneous impact, thereby preventing the test section from being damaged due to excessive deformation. The device has a reasonable structural design, and the connection between the components is solid and reliable, ensuring the accuracy and stability of the test data. It can not only measure the dynamic interaction force between the drill bit and the drill rod, but also effectively buffer the instantaneous impact force generated during drill bit operation, protecting the test section from damage. Attached Figure Description

[0018] Figure 1 This is a schematic cross-sectional view of the test section provided in one embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the test specimen;

[0020] Figure 3 This is a cross-sectional structural diagram of the drill bit connector;

[0021] Figure 4 This is a schematic diagram of the end face of the drill bit connector.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Test piece; 11. Test piece body; 111. Inner cylinder; 111a. Mounting groove; 112. Outer shell; 113. Seal; 114. Groove; 12. Detection element;

[0024] 2. Drill bit connector; 21. External threaded connector; 211. Protrusion; 22. Sliding part; 221. Guide sleeve; 221a. Slide groove; 222. Slider; 223. Retaining ring; 23. Adjusting part; 231. Threaded sleeve;

[0025] 3. Buffer components. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] To address the technical problem that test subs cannot effectively buffer the instantaneous impact force generated during drill bit operation, leading to excessive deformation and damage to the deformation area of ​​the inner cylinder, this utility model provides a test sub that can not only measure the dynamic interaction force between the drill bit and the drill pipe, but also effectively buffer the instantaneous impact force generated during drill bit operation, protecting the test sub from damage.

[0028] It should be noted that the test section described in this utility model is used for, but not limited to, downhole drilling operations. For ease of explanation, this utility model only uses the application of the test section in downhole drilling operations as an example. The principle of the test section applied to other types of equipment is essentially the same as that applied to other types of equipment, and will not be described in detail here.

[0029] Please see Figure 1 , Figure 1 This is a schematic cross-sectional view of the test section in one embodiment of the present invention. The test section includes: a test piece 1, a drill bit connector 2, and a buffer 3. The test piece 1 has a connecting end and a transmission end. The connecting end is configured to connect to the drill pipe. One end of the drill bit connector 2 corresponds to the transmission end of the test piece 1 and can move relative to the transmission end to contact or move away from the transmission end. The other end of the drill bit connector 2 is configured to connect to the drill string. The buffer 3 connects the test piece 1 and the drill bit connector 2 to provide a buffering force acting between the test piece 1 and the drill bit connector 2.

[0030] In this device, the connecting end of test piece 1 is used to connect to the drill rod, and the drill bit connector 2 is used to connect the drill bit and other drilling tools. The drill bit connector 2 can move relative to the transmission end. Simultaneously, the drill bit connector 2 can contact or move away from the transmission end of test piece 1. In the non-working state, the drill bit connector 2 can move away from test piece 1 under the action of the buffer 3. During operation, there is a buffer gap between the drill bit connector 2 and test piece 1, so that the buffer 3 can buffer the impact force generated when the drill tool suddenly contacts the formation, protecting test piece 1 and drill bit connector 2 from damage. The drill bit connector 2 can contact the transmission end when the drill tool contacts the formation, thereby transmitting mechanical parameters such as torque or pressure to the detection element 12, thus realizing real-time monitoring of mechanical properties during drilling. The buffer 3 provides a buffering force acting between test piece 1 and drill bit connector 2, effectively reducing the damage to test piece 1 and drill bit connector 2 caused by vibration or impact during drilling operations, improving the accuracy of the test and the durability of the device.

[0031] Preferably, please refer to Figure 1 and Figure 2 In this embodiment, the test piece includes a test piece body 11 and a detection element 12. The test piece body 11 has a connecting end and a transmission end, and the detection element 12 is connected to the test piece body 11. The test piece body 11 includes an inner cylinder 111 and an outer shell 112. An installation groove 111a is provided in the middle of the outer side of the inner cylinder 111. The installation groove 111a is used to install the detection element 12. Because the inner cylinder 111 has an installation groove 111a, its middle wall is relatively thin and designed to deform under stress. The detection end of the detection element 12 corresponds to the deformation area of ​​the side wall of the inner cylinder 111, and can detect its deformation. Thus, the mechanical properties can be monitored in real time according to the stress during the drilling process.

[0032] Furthermore, the outer shell 112 wraps around the outer side of the inner cylinder 111 to protect the inner cylinder 111 and the detection element 12 inside the mounting groove 111a. In addition, a sealing element 113 is provided between the outer shell 112 and the inner cylinder 111 to seal the mounting groove 111a. The sealing element 113 is preferably a sealing ring. The mounting groove 111a is an annular groove, and the outer shell 112 is an annular shell that is fitted onto the outer side of the inner cylinder 111. At least two sealing rings are provided, respectively placed at both ends of the inner side of the outer shell 112 and fitted onto the inner cylinder 111 to ensure the sealing between the outer shell 112 and the inner cylinder 111, preventing external impurities or moisture from entering the mounting groove 111a and thus preventing any interference with the normal operation of the detection element 12.

[0033] It should be noted that the mounting slot 111a also houses other electronic components such as an electronic control motherboard. The electronic control motherboard is connected to the detection element 12 via wires or wirelessly to ensure stable signal transmission. The detection element 12 is a strain sensor, which is attached to the outer wall of the inner cylinder 111 and corresponds to the deformation area. It is used to detect the deformation of the inner cylinder 111 under stress. When the drill bit is subjected to the force of the formation during operation, the force is transmitted to the transmission end of the test piece 1 through the drill bit connector 2, and then to the test piece body 11, so that the inner cylinder 111 can produce a certain deformation after being subjected to stress. This deformation is detected by the strain sensor, and the deformation signal is converted into an electrical signal for output, thereby enabling real-time monitoring of the mechanical properties during the drilling process. Of course, in other possible embodiments, the detection element 12 can also be other types of mechanical sensors, such as acceleration sensors, pressure sensors, etc.

[0034] To achieve accurate torque and pressure transmission, please refer to [link / reference]. Figures 1 to 4In some possible embodiments, a protrusion 211 protruding towards the test piece 1 is provided at the end of the drill bit connector 2 corresponding to the transmission end. The transmission end of the test piece 1 is provided with a groove 114 that matches the protrusion 211. When the drill bit connector 2 is subjected to force and moves towards the test piece 1, the protrusion 211 can be embedded in the groove 114. The protrusion and groove restrict the rotation of the protrusion relative to the groove through their cooperation, thereby achieving accurate transmission of torque and pressure and avoiding test errors caused by relative sliding or misalignment between the transmission end and the drill bit connector 2. Preferably, in this embodiment, the protrusion 211 and the groove 114 are designed as polygonal structures, such as hexagons or octagons.

[0035] In this embodiment, the drill bit connector 2 further includes an external threaded connector 21, a sliding part 22, and an adjusting part 23. The sliding part 22 is fitted onto the outside of the test piece body 11 and the external threaded connector 21. One end of the sliding part 22 is slidably connected to the external threaded connector 21, and the other end is connected to the test piece body 11 through the adjusting part 23, so that the external threaded connector 21 can slide relative to the test piece body 11 within the sliding part 22, thereby realizing the relative movement between the drill bit connector 2 and the test piece 1.

[0036] Please see Figure 1 In one embodiment, the sliding part 22 includes a guide sleeve 221, a slider 222, and a retaining ring 223. The guide sleeve 221 is disposed on the outside of the test piece 1 and the external threaded connector 21, and a groove 221a is formed inside one end of the guide sleeve 221. The slider 222 has an annular structure, and its outer diameter is the same as the inner diameter of the groove 221a, allowing it to slide stably within the groove 221a. The inner diameter of the slider 222 matches the outer diameter of the inner cylinder 111, allowing it to slide synchronously on the outside of the inner cylinder 111 during sliding, resulting in high stability during sliding and ensuring that the external threaded connector 21 can slide stably within the guide sleeve 221. The retaining ring 223 is disposed at the other end of the guide sleeve 221 to limit the sliding range of the slider 222 and prevent the slider 222 from falling out of the guide sleeve 221. One end of the external threaded connector 21 extends into the groove 221a and is provided with a protrusion 211, which is connected to the slider 222. The sidewall of the external threaded connector 21 is slidably connected to the retaining ring 223.

[0037] Furthermore, in some possible embodiments, the length of the slider 222 is configured to be greater than or equal to the maximum distance between the test piece 1 and the external threaded connector 21, to ensure that the slider 222 can always stably connect to and support the external threaded connector 21 during any relative movement between the test piece 1 and the drill bit connector 2.

[0038] In one embodiment, the adjusting part 23 is movable relative to the sliding part 22. Specifically, it includes a threaded sleeve 231 and a spring as the buffer element 3. The threaded sleeve 231 fits tightly with the outer casing 112, and its outer side is provided with external threads. The guide sleeve 221 has an internal thread groove on its inner side at the end furthest from the drill bit connector 2, which is threadedly connected to the external threads. The spring is located between the slider 222 and the threaded sleeve 231, with one end fixed to the slider 222 and the other end connected to the threaded sleeve 231. When the external threaded connector 21 is subjected to external force, the spring can be compressed, thereby buffering the impact of the external force on the test piece 1. In actual operation, the distance between the slider 222 and the threaded sleeve 231 can be adjusted by rotating the threaded sleeve 231, thereby adjusting the degree of spring compression and thus adjusting the buffering force acting between the test piece 1 and the drill bit connector 2. Therefore, the user can flexibly adjust the buffering force according to actual needs to adapt to different drilling operation conditions.

[0039] It should be noted that the threaded sleeve 231 can be rotatably fitted and fixedly connected to the outer shell 112. When it is fixedly connected to the outer shell 112, the rotation of the threaded sleeve 231 will drive the entire test piece 1 to rotate. The position of the outer shell 112 inside the threaded sleeve 231 is adjustable, which can adjust the test piece 1 and the external threaded connector 21 to maintain the initial distance. It should be noted that after adjustment, the positions of the groove 114 and the protrusion 211 should be kept in correspondence to ensure that the protrusion 211 can be embedded in the groove 114. At the same time, a spacer, such as an annular washer, is provided between the spring and the threaded sleeve 231. The spring is fixedly connected to the annular washer, and the annular washer is rotatably connected to the threaded sleeve 231, so that the spring can remain stable during compression and prevent the spring from tilting or twisting.

[0040] To better understand this utility model, the following is combined with... Figures 1 to 4 The technical solution of this utility model is described in detail as follows: Before drilling operations, one end of the inner cylinder 111 is connected to the drill rod, and the external threaded connector 21 is connected to the required drilling tool. Before the operation begins, the drill bit connector 2, under the action of a spring, moves away from the inner cylinder 111 and maintains a certain initial distance from it. When drilling begins, the drill tool contacts the formation, generating an impact force, which is transmitted to the external threaded connector 21. At this time, the external threaded connector 21 moves towards the test piece 1 under force, and the protrusion 211 is embedded in the groove 114, achieving accurate transmission of torque and pressure. Simultaneously, the spring is compressed, buffering the impact of external forces on the test piece 1 and protecting the test piece 1 and the drill bit connector 2 from damage.

[0041] This invention, through the configuration of a test piece 1, a drill bit connector 2, and a buffer 3, achieves stable data transmission through the cooperation of the drill bit connector 2 and the test piece 1. The detection element 12 of the test piece 1 can accurately acquire the required data, enabling real-time monitoring of the mechanical properties during drilling. The buffer 3 absorbs the impact force through its own compression deformation when the drill bit is subjected to instantaneous impact, thereby preventing damage to the test section due to excessive deformation. The device has a reasonable structural design, and the connections between components are stable and reliable, ensuring the accuracy and stability of the test data. It not only enables the measurement of the dynamic interaction force between the drill bit and the drill rod but also effectively buffers the instantaneous impact force generated during drill bit operation, protecting the test section from damage.

[0042] In the description of this application, it should be noted that the terms "upper" and "lower," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0043] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0044] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A test sub, characterized by, The application relates to a testing device for a drill rod, which comprises a testing piece, a drill bit connecting piece and a buffer piece. The testing piece has a connecting end and a transmission end, and the connecting end is arranged to be connected with a drill rod. The drill bit connecting piece has one end corresponding to the transmission end of the testing piece, and the other end is arranged to be connected with a drill tool. The buffer piece is arranged between the testing piece and the drill bit connecting piece to provide a buffering force between the testing piece and the drill bit connecting piece. The testing piece comprises a testing piece body and a detection element, the testing piece body has the connecting end and the transmission end, and the detection element is connected with the testing piece body.

2. The test nipple of claim 1, wherein, The testing piece body comprises an inner cylinder and an outer shell, the outer side of the inner cylinder is provided with an installation groove, the detection element is arranged in the installation groove, and the detection end of the detection element is connected with the side wall of the inner cylinder; the outer shell is arranged on the outer side of the inner cylinder and covers the installation groove.

3. The test nipple of claim 2, wherein, A sealing piece is arranged between the outer shell and the inner cylinder.

4. The test nipple of claim 3, wherein, The end of the drill bit connecting piece corresponding to the transmission end of the testing piece is provided with a protrusion, the transmission end of the testing piece is provided with a groove, the groove is matched with the protrusion, and the protrusion and the groove are matched to limit the rotation of the protrusion relative to the groove.

5. The test nipple of claim 1, wherein, The drill bit connecting piece comprises an outer thread joint, a sliding part and an adjusting part, the outer thread joint is coaxially arranged on the transmission end side of the transmission end, the sliding part is sleeved on the outer side of the testing piece body and the outer thread joint, one end of the sliding part is slidably connected with the outer thread joint, and the adjusting part is connected with the testing piece body and the sliding part and can move relative to the sliding part.

6. The test segment of claim 2, wherein, The buffer piece is a spring, one end of the spring is connected with the testing piece through the adjusting part, the other end of the spring is connected with the outer thread joint through the sliding part, and when the outer thread joint is subjected to external force, the spring can be compressed to buffer the impact of the external force on the testing piece.

7. The test segment of claim 6, wherein, The sliding part comprises a guide sleeve and a sliding block, the guide sleeve is arranged on the outer side of the testing piece and the outer thread joint, and a sliding groove is formed in the guide sleeve, the sliding block is slidably arranged in the sliding groove, and the outer thread joint is connected with the sliding block.

8. The test segment of claim 6, wherein, The inner diameter of the sliding block is matched with the outer diameter of the testing piece, and the length of the sliding block is greater than or equal to the maximum distance between the testing piece and the outer thread joint.

9. The test segment of claim 8, wherein, The adjusting part comprises a threaded sleeve, the threaded sleeve is sleeved with the testing piece, the outer side of the threaded sleeve is provided with external thread teeth, the inner side of the end of the guide sleeve away from the outer thread joint is provided with an internal thread groove, and the internal thread groove is threadedly connected with the external thread teeth.

10. The test segment of claim 8 or 9, wherein, ​

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