Electric rotary guiding shoe and shaft quality detection instrument

Abstract

The invention discloses an electric rotary guiding shoe and a shaft quality detection instrument.The electric rotary guiding shoe (10) is applied to the shaft quality detection instrument, the shaft quality detection instrument comprises the electric rotary guiding shoe (10) and an instrument body (20), and the electric rotary guiding shoe (10) comprises a connector (11), a guiding shoe head (12) and a driving mechanism (13); the first end of the guiding shoe head (12) is rotationally connected with the first end of the connector (11), the second end of the connector (11) is used for being connected with an instrument body (20), the driving mechanism (13) is arranged in the connector (11) and connected with the guiding shoe head (12), and the driving mechanism (13) is used for driving the guiding shoe head (12) to rotate relative to the connector (11). According to the scheme, the problems that well descending efficiency is low and cost is high due to the fact that well descending of a shaft quality detection instrument involved in the related technology is difficult can be solved.

Description

Technical Field

[0001] This invention relates to the field of drilling inspection equipment design technology, and in particular to an electric rotary guide shoe and wellbore quality inspection instrument. Background Technology

[0002] In some oilfields (such as older oilfields), wellbore damage and frequent casing quality changes are common. Effective and timely identification of wellbore corrosion and leakage, followed by scientifically implemented measures, can help reduce losses caused by production stoppages and reductions. As the formation environments of high-temperature, high-pressure wells and deep gas wells become increasingly complex, and the working media (such as nitrogen and carbon dioxide) become more diverse, wellbore quality faces severe challenges. Reports indicate that the main global wellbore quality problems include well completion string deformation, wear, corrosion, leakage, and perforation, as well as other issues such as casing cementing quality.

[0003] To ensure the safety of oil and gas wells and improve wellbore quality, it is necessary to study wellbore quality, optimize wellbore "check-up and diagnosis" methods, and implement effective wellbore string monitoring and cement aging assessment. To this end, many domestic and international companies have developed wellbore quality testing instruments to obtain necessary information about the wellbore through downhole testing, thereby providing guidance for subsequent remedial actions.

[0004] Wellbore quality inspection instruments need to be run into the well for inspection work. In related technologies, wellbore quality inspection instruments are mainly run into the well using two methods: natural cable lowering and drilling tool deployment. Natural cable lowering offers advantages in speed and efficiency, effectively reducing well construction time and costs. However, the complex downhole environment of oil and gas wells, such as casing damage, high wellbore curvature, or irregular wellbore walls in open-hole sections, can prevent the wellbore quality inspection instrument from reaching the predetermined well depth. This necessitates retrieving the instrument and re-deploying it using conventional drilling tools, which not only consumes excessive time and costs but also increases operational risks.

[0005] How to solve the above-mentioned technical problems is a technical problem that urgently needs to be solved by technicians in related technical fields. Summary of the Invention

[0006] This invention discloses an electric rotating guide shoe and a wellbore inspection instrument to solve the problems of low efficiency and high cost caused by the difficulty of lowering wellbore quality inspection instruments in related technologies.

[0007] To address the aforementioned technical problems, the present invention discloses the following technical solutions:

[0008] On one hand, an embodiment of the present invention discloses an electric rotating guide shoe, which is applied to a wellbore quality inspection instrument. The wellbore quality inspection instrument includes the electric rotating guide shoe and an instrument body. The electric rotating guide shoe includes a connector, a guide shoe head, and a drive mechanism. The first end of the guide shoe head is rotatably connected to the first end of the connector. The second end of the connector is used to connect to the instrument body. The drive mechanism is disposed in the connector and connected to the guide shoe head. The drive mechanism is used to drive the guide shoe head to rotate relative to the connector.

[0009] Optionally, in the electric rotating guide shoe, the electric rotating guide shoe further includes a plurality of anti-abrasion devices, which are distributed at intervals in the rotation direction of the joint, and a guide groove is formed between two adjacent anti-abrasion devices.

[0010] Optionally, in an electrically rotating guide shoe, the abrasion protector includes a base and a plurality of hard alloy blocks distributed on the base, the base being fixed to the toe of the guide shoe.

[0011] Optionally, in an electrically rotating guide shoe, the plurality of abrasion protectors are arranged at an angle relative to the guiding direction of the guide shoe head.

[0012] Optionally, in an electrically rotating guide shoe, the connector is rotatably connected to the guide shoe head via a pressure-resistant bearing.

[0013] Optionally, in the electric rotating guide shoe, the connector is a cylindrical structure. The port at the first end of the connector is used to connect to the instrument body, and the port at the second end of the connector is rotatably connected to the guide shoe head. The guide shoe head has an inner cavity, and the cylindrical cavity of the connector communicates with the inner cavity. The driving mechanism includes a drive motor, which includes a motor body and a power output shaft connected thereto. The motor body is fixed in the cylindrical cavity, and the power output shaft extends into the inner cavity and is fixedly connected to the inner wall of the inner cavity.

[0014] Optionally, in the electric rotary guide shoe, the motor body is fixed in the cylindrical cavity by a threaded connection; the electric rotary guide shoe also includes an elastic coupling, which is fixedly connected to the inner wall of the inner cavity, the first end of the power output shaft is rotatably connected to the motor body, and the second end of the power output shaft is fixedly connected to the elastic coupling.

[0015] Optionally, in the electric rotary guide shoe, the electric rotary guide shoe further includes a support base, the support base having a threaded hole and an external thread, the support base being fixedly connected to the internal cavity thread through the external thread engaging with the internal thread, and the second end of the power output shaft being fixedly connected to the threaded hole through a threaded engagement.

[0016] Optionally, in the electric rotating guide shoe, the electric rotating guide shoe further includes an elastic retaining spring, a bolt, and a shock-absorbing bearing; the outer rings of the elastic retaining spring and the shock-absorbing bearing are both fixed in the cylindrical cavity and are respectively located on opposite sides of the motor body. The motor body is positioned and engaged with the elastic retaining spring. The inner ring of the shock-absorbing bearing is sleeved on the power output shaft and rotates with the power output shaft relative to the outer ring of the shock-absorbing bearing. The bolt passes through the elastic retaining spring and the motor body and is fixedly connected to the outer ring of the shock-absorbing bearing.

[0017] On the other hand, embodiments of the present invention disclose a wellbore quality testing instrument, which includes a traction cable, an instrument body, and an electric rotating guide shoe as described in any of the above. The connector is connected to the instrument body, the instrument body is electrically connected to the drive mechanism, and one end of the traction cable is electrically connected to the instrument body.

[0018] The technical solutions disclosed in the embodiments of the present invention have the following technical effects:

[0019] The wellbore quality inspection instrument disclosed in this invention includes a traction cable connected to the instrument body, which in turn is connected to an electric rotating guide shoe. During operation, the instrument body and the electric rotating guide shoe are lowered naturally by the traction cable. As they descend into the wellbore, the instrument body and the electric rotating guide shoe move downwards under gravity. As the foremost component, the electric rotating guide shoe is the first to encounter resistance. In this invention, the electric rotating guide shoe's drive mechanism rotates its head during descent. This rotation overcomes the obstruction of the wellbore's inner wall and reduces friction between the electric rotating guide shoe and the inner wall, allowing the instrument body to be lowered more smoothly and ultimately to a predetermined depth. This invention transforms passive lowering into active rotation to overcome obstacles, making the instrument body easier to lower and thus improving the efficiency of the wellbore quality inspection instrument. Furthermore, because lowering the wellbore quality inspection instrument is relatively easy, it reduces the cost associated with re-extraction due to difficulty in lowering. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the wellbore quality testing instrument disclosed in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of a structure of an electrically rotating guide shoe disclosed in an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of another structure of the electric rotating guide shoe disclosed in an embodiment of the present invention.

[0023] The components in the diagram are labeled as follows:

[0024] 10-Electric rotating guide shoe, 11-Joint, 111-Cylinder cavity, 12-Guide shoe head, 121-Inner cavity, 13-Drive mechanism, 131-Motor body, 132-Power output shaft, 133-Electrical connection, 14-Wear protector, 141-Base, 142-Hard alloy block, 15-Guide groove, 16-Pressure bearing, 17-Flexible coupling, 18-Support seat, 191-Flexible snap ring, 192-Bolt, 193-Shock-resistant bearing, 1931-Outer ring, 1932-Inner ring

[0025] 20-Instrument body,

[0026] 30 - Traction cable. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0028] The technical solutions disclosed in the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] Please refer to Figures 1 to 3 This invention discloses an electric rotating guide shoe 10. The disclosed electric rotating guide shoe 10 is applied to a wellbore quality inspection instrument, which includes the electric rotating guide shoe 10, an instrument body 20, and a traction cable 30.

[0030] The electric rotating guide shoe 10 plays a guiding role. The electric rotating guide shoe 10 is connected to the instrument body 20, thereby guiding the instrument body 20 to descend in the well shaft, and finally allowing the instrument body 20 to be lowered to the preset depth.

[0031] The instrument body 20 is used to be lowered to a preset depth for detection inside the wellbore. In this embodiment of the invention, the detection principle and process of the instrument body 20 inside the wellbore are existing technologies and will not be described in detail here.

[0032] In this embodiment of the invention, the electric rotating shoe guide 10 may include a connector 11, a shoe guide head 12, and a drive mechanism 13.

[0033] The shoe head 12 is essentially the main body of the electrically rotating shoe head 10. The first end of the shoe head 12 is rotatably connected to the first end of the connector 11. Optionally, the first end of the shoe head 12 and the first end of the connector 11 can be rotatably connected by a simple shaft hole fit, or they can be rotatably connected by an intermediate connecting part (such as a bearing, universal joint, etc.). The embodiments of the present invention do not limit the specific connection method between the first end of the shoe head 12 and the first end of the connector 11.

[0034] To achieve the guiding function, the shoe toe 12 has a tapered structure. Specifically, the cross-sectional area of ​​the shoe toe 12 decreases in the guiding direction. The first end of the shoe toe 12 is the large end, and the second end is the small end. The cross-section of the shoe toe 12 refers to the surface formed by cutting the shoe toe 12 in a direction perpendicular to its own axis of rotation (the axis of rotation is parallel to the guiding direction).

[0035] The second end of connector 11 is used to connect to the instrument body 20. It should be noted that the first end and the second end of connector 11 are opposite ends of connector 11. Optionally, the second end of connector 11 can be a threaded interface. Of course, it can also be other types of connector 11, such as plug connectors, snap-fit ​​connectors, etc. The embodiments of the present invention do not limit the specific type of connector 11.

[0036] The drive mechanism 13 is located inside the connector 11 and is connected to the guide shoe head 12. The drive mechanism 13 is used to drive the guide shoe head 12 to rotate relative to the connector 11. Driving the guide shoe head 12 to rotate can overcome the obstacles encountered during the descent, thereby guiding the instrument body 20 to be lowered more easily to the preset depth in the wellbore.

[0037] The wellbore quality inspection instrument disclosed in this embodiment of the invention includes a traction cable 30, which is connected to the instrument body 20, and the instrument body 20 is connected to an electric rotating guide shoe 10. In the specific working process, the instrument body 20 and the electric rotating guide shoe 10 are naturally lowered by the traction cable 30. During the lowering process into the wellbore, the instrument body 20 and the electric rotating guide shoe 10 descend under the action of gravity. As the foremost component, the electric rotating guide shoe 10 is most likely to encounter resistance first. In the lowering process of the electric rotating guide shoe 10 disclosed in this embodiment of the invention, the drive mechanism 13 can drive the guide shoe head 12 to rotate. The rotation of the guide shoe head 12 overcomes the obstruction of the inner wall of the wellbore and reduces the friction between the electric rotating guide shoe 10 and the inner wall of the wellbore, allowing the instrument body 20 to be lowered more smoothly, ultimately making it easier to lower the instrument body 20 to the preset depth. The electric rotating guide shoe 10 disclosed in this embodiment of the invention can change passive lowering to active rotation to overcome resistance, making the instrument body 20 easier to lower, thereby improving the efficiency of the wellbore quality inspection instrument in lowering the well. Of course, since it is relatively easy to lower wellbore quality inspection instruments, it is less likely to cause cost issues due to difficulties in lowering them and the need to re-extract them from the well.

[0038] As mentioned above, the electric rotating guide shoe 10 is the first part to encounter obstacles during the lowering of the wellbore quality inspection instrument, and it is also the part most prone to friction and wear against the inner wall of the wellbore. Therefore, the electric rotating guide shoe 10 disclosed in this embodiment of the invention may further include multiple anti-wear devices 14. These multiple anti-wear devices 14 are spaced apart in the rotation direction of the guide shoe head 12 and fixed to the guide shoe head 12. A guide groove 15 can be formed between adjacent anti-wear devices 14. During the lowering process of the electric rotating guide shoe 10, the rotating guide shoe head 12 contacts the inner wall of the wellbore through the anti-wear devices 14. The anti-wear devices 14 are made of at least wear-resistant material and have good anti-wear performance, thereby avoiding severe wear on the guide shoe head 12. Simultaneously, the guide groove 15 can guide and remove obstacles encountered during the lowering of the guide shoe head 12 during its rotation, thereby preventing the accumulation of obstacles at the front end of the guide shoe head 12.

[0039] There can be various types of anti-abrasion devices 14, and the embodiments of the present invention do not limit the specific type of anti-abrasion device 14. In one example, the anti-abrasion device 14 may include a base 141 and a plurality of hard alloy blocks 142 distributed on the base 141, and the base 141 is fixed to the toe cap 12 of the shoe. The base 141 can be fixed to the toe cap 12 of the shoe by welding, connecting with connectors, or other methods.

[0040] Since the anti-wear device 14 is fixed to the guide shoe head 12 and can rotate with the guide shoe head 12, in order to achieve better flow guidance in the guide channel 15, multiple anti-wear devices 14 are inclined relative to the guiding direction of the guide shoe head 12, so that the guide channel 15 also extends inclined relative to the guiding direction, thereby reducing the resistance encountered by obstructions entering the guide channel 15 when the guide shoe head 12 rotates. It should be explained that the guiding direction of the guide shoe head 12 is essentially the direction in which the entire electrically rotating guide shoe 10 is lowered into the wellbore.

[0041] As mentioned above, there are several ways to rotatably connect the shoe toe 12 and the connector 11. One embodiment is that the connector 11 and the shoe toe 12 can be rotatably connected via a pressure bearing 16. The pressure bearing 16 is made of a high-strength material; for example, it can be a bearing made of high-strength steel.

[0042] In this embodiment of the invention, the connector 11, the drive mechanism 13, and the shoe guide head 12 are connected in sequence. That is, the drive mechanism 13 can be located between the connector 11 and the shoe guide head 12. Considering that the drive mechanism 13 is prone to damage, in this embodiment of the invention, the drive mechanism 13 can be located inside the connector 11, thereby protecting the connector 11.

[0043] One specific embodiment is as follows: the connector 11 can be a cylindrical structure. The port at the first end of the connector 11 is used to connect to the instrument body 20, and the port at the second end of the connector 11 is rotatably connected to the guide shoe head 12. For example, the port at the second end of the connector 11 can be rotatably connected to the guide shoe head 12 through a pressure bearing 16. The guide shoe head 12 has an inner cavity 121, and the cylindrical cavity 111 of the connector 11 communicates with the inner cavity 121, thereby forming a relatively enclosed space, thus providing better protection for the components placed inside them through the connector 11 and the guide shoe head 12. The drive mechanism 13 can be placed in this enclosed space, thereby receiving better protection.

[0044] In the embodiment where the connector 11 is rotatably connected to the guide shoe head 12 via the pressure bearing 16, the pressure bearing 16 can seal against the connector 11 and the guide shoe head 12, thereby ensuring a tight fit between the cavity 111 of the connector 11 and the inner cavity 121 of the guide shoe head 12, thus preventing foreign objects from entering the connector 11 or the guide shoe head 12 during the lowering process into the wellbore. Optionally, a seal can be provided between the outer ring of the pressure bearing 16 and the port at the second end of the connector 11 or the guide shoe head 12.

[0045] The drive mechanism 13 can be of various types, and the embodiments of the present invention do not limit the specific type of drive mechanism 13. One example is that the drive mechanism 13 may include a drive motor, which may include a motor body 131 and a power output shaft 132. The power output shaft 132 is connected to the motor body 131 and can rotate relative to the motor body 131 when the drive motor is working. The motor body 131 is fixed in the cylindrical cavity 111, and the power output shaft 132 extends into the inner cavity 121 and is fixedly connected to the inner wall of the inner cavity 121. Since the motor body 131 and the power output shaft 132 are respectively fixed in the cylindrical cavity 111 and the inner cavity 121, when the drive motor is working, the power output shaft 132 will drive the guide shoe head 12 to rotate relative to the connector 11, thereby achieving operation. This structure can protect the drive mechanism 13 from the connector 11 and the guide shoe head 12. At the same time, the motor body 131 and the power output shaft 132 can be connected to the connector 11, which serves as the base, and the inner wall of the rotating guide shoe head 12, respectively. It has the advantages of clear assembly and simple structure.

[0046] Specifically, the motor body 131 can be fixed in the cylinder cavity 111 by means of snap-fitting, welding, or other methods. Considering the disassembly and assembly during maintenance or replacement, in other embodiments, the motor body 131 can be fixed in the cylinder cavity 111 by threaded engagement, thereby achieving a detachable connection between the motor body 131 and the connector 11. The threaded assembly method allows the motor body 131 to be fixed in the cylinder cavity 111 in a relatively simple way, and also facilitates disassembly and assembly during subsequent maintenance or replacement.

[0047] The power output shaft 132 of the drive mechanism 13 can be directly and fixedly connected to the inner wall of the shoe guide head 12, thereby achieving fixation within the inner cavity 121 of the shoe guide head 12. Specifically, the end of the power output shaft 132 can be fixed to the inner wall of the inner cavity 121 of the shoe guide head 12 through bonding, connecting parts, snap-fitting, or other methods. In other examples, the electric rotating shoe guide 10 disclosed in this embodiment of the invention may also include an elastic coupling 17. The elastic coupling 17 is fixedly connected to the inner wall of the inner cavity 121, for example, the elastic coupling 17 can be fixed to the inner wall of the inner cavity 121 through welding, bonding, threaded connection, or other methods. The first end of the power output shaft 132 is rotatably connected to the motor body 131. During the operation of the drive motor, the power output shaft 132 rotates under the action of the motor body 131, thereby transmitting the rotational torque of the power output shaft 132 from the first end to the second end of the power output shaft 132. The second end of the power output shaft 132 is fixedly connected to the flexible coupling 17. The rotational torque of the second end of the power output shaft 132 is transmitted to the guide shoe head 12 through the flexible coupling 17, ultimately realizing the rotation of the guide shoe head 12. In this structure, because the flexible coupling 17 is elastic, it can compensate for the axial misalignment of the power output shaft 132 and absorb shocks, thus effectively extending the service life of the drive mechanism 13.

[0048] The power output shaft 132 has a smaller diameter, while the guide shoe head 12 has a larger size. Correspondingly, the inner cavity 121 of the guide shoe head 12 is also larger, particularly in the radial direction of the power output shaft 132. To facilitate the connection between the power output shaft 132 and the inner wall of the guide shoe head 12, in a more specific embodiment, the electrically rotating guide shoe 10 may further include a support base 18. The support base 18 is fixed within the inner cavity 121 of the guide shoe head 12, and the second end of the power output shaft 132 can be fixedly connected to the support base 18, thereby indirectly achieving the connection with the guide shoe head 12. This structure makes the connection between the power output shaft 132 and the guide shoe head 12 much easier.

[0049] Optionally, the support base 18 may be provided with a threaded hole and an external thread, and the support base 18 may be fixedly connected to the inner cavity 121 of the guide shoe head 12 by the external thread engaging with the thread. This structure makes it easier to assemble and disassemble the support base 18 and the guide shoe head 12.

[0050] Similarly, the second end of the power output shaft 132 is fixedly connected to the threaded hole through a threaded engagement. This structure allows for a detachable engagement between the power output shaft 132 and the support base 18, making the assembly and disassembly of the power output shaft 132 easier.

[0051] In this embodiment of the invention, the drive motor can be a speed-adjustable high-torque motor, which can be a permanent magnet motor. Permanent magnet motors have a wide speed range and are not affected by torque fluctuations at low speeds. They are especially suitable for high-torque loads and are well-suited for driving the rotation of the guide shoe head 12 when lowering it into the wellbore.

[0052] During the actual descent process, the electric rotating guide shoe 10 will encounter obstacles. As the guide shoe head 12 of the electric rotating guide shoe 10 rotates, it will overcome the obstacles and descend. Vibration is easily generated during this process. The second end of the power output shaft 132 is connected through the flexible coupling 17. The flexible coupling 17 can effectively buffer the vibration, thereby ensuring the stability of the connection between the power output shaft 132 and the guide shoe head 12.

[0053] Similarly, to improve the stability of the motor body 131 installation, the electric rotary guide shoe 10 disclosed in this embodiment of the invention may optionally include an elastic retaining spring 191. The elastic retaining spring 191 can be fixed in the cylindrical cavity 111, and the elastic retaining spring 191 can limit the engagement with the motor body 131 in the direction of the port of the first end of the connector 11. In this case, the motor body 131 is less likely to loosen due to vibration under the limiting effect of the elastic retaining spring 191. The elastic retaining spring 191 has good vibration damping and can buffer the impact caused by vibration, ensuring the installation stability of the motor body 131 and preventing loosening. Especially in the embodiment where the motor body 131 is installed in the cylindrical cavity 111 through a threaded engagement, the elastic retaining spring 191 can prevent the threaded engagement between the motor body 131 and the inner wall of the cylindrical cavity 111 from loosening.

[0054] Furthermore, the electric rotating guide shoe 10 disclosed in this embodiment of the invention may further include a shock-absorbing bearing 193, the outer ring 1931 of which can be fixed in the cylindrical cavity 111. The shock-absorbing bearing 193 and the elastic retaining ring 191 can be respectively disposed on opposite sides of the motor body 131. Of course, the motor body 131 can also be fitted with the shock-absorbing bearing 193 to further improve the installation stability of the motor body 131. Specifically, the outer ring 1931 of the shock-absorbing bearing 193 can be fixed in the cylindrical cavity 111 by interference fit, welding, or other methods, which is not limited in this embodiment of the invention.

[0055] In other embodiments, the inner ring 1932 of the anti-vibration bearing 193 can be sleeved on the power output shaft 132 and rotate with the power output shaft 132 relative to the outer ring 1931 of the anti-vibration bearing 193. In this structure, the anti-vibration bearing 193 can provide additional support for the power output shaft 132, thereby making the rotation of the power output shaft 132 more stable and indirectly improving the installation stability of the drive mechanism 13. Specifically, the power output shaft 132 can be fixedly connected to the inner ring 1932 of the anti-vibration bearing 193 through an interference fit. The inner ring 1932 of the anti-vibration bearing 193 can rotate relative to the outer ring 1931 of the anti-vibration bearing 193.

[0056] It should be explained that the anti-vibration bearing 193 can be made of a material with a certain shock absorption function, and the specific material of the anti-vibration bearing 193 is not limited in the embodiments of the present invention.

[0057] The electric rotating guide shoe 10 disclosed in this embodiment of the invention may further include a bolt 192, which passes through the elastic retaining ring 191 and the motor body 131, and is fixedly connected to the outer ring 1931 of the anti-vibration bearing 193. In this case, the bolt 192 can connect the elastic retaining ring 191, the motor body 131 and the anti-vibration bearing 193, thereby improving the stability of the connection of the motor body 131.

[0058] Based on the electrically driven rotating guide shoe 10 disclosed in the embodiments of the present invention, the present invention further discloses a wellbore quality inspection instrument, which includes a traction cable 30, an instrument body 20, and the electrically driven rotating guide shoe 10 described in the above embodiments. A connector 11 is connected to the instrument body 20, the instrument body 20 is electrically connected to the drive mechanism 13, and one end of the traction cable 30 is electrically connected to the instrument body 20. Specifically, the motor body 131 of the drive mechanism 13 is provided with an electrical connection part 133, which is electrically connected to the instrument body 20. Optionally, the electrical connection part 133 can be electrically connected to the instrument body 20 via a short cable. Of course, the embodiments of the present invention do not limit the electrical connection method between the electrical connection part 133 and the instrument body 20.

[0059] In the specific testing process, the traction cable 30 lowers the instrument body 20 and the electric rotating guide shoe 10 into the well shaft. The instrument body 20 and the electric rotating guide shoe 10 descend into the well shaft under their own weight. During this process, the electric rotating guide shoe 10 can continuously keep the guide shoe head 12 rotating, or it can open after encountering resistance, thus keeping the guide shoe head 12 rotating. This embodiment of the invention is not limited in scope. In this process, the traction cable 30 not only plays a traction role but also functions as an electrical control connection and power supply. The instrument body 20 can also supply power to the electric rotating guide shoe 10; of course, the instrument body 20 can also electrically control the electric rotating guide shoe 10 through electrical connection.

[0060] The wellbore quality testing instrument disclosed in this invention can solve the problem that it is difficult to reach the desired depth when lowering the instrument body 20 and the electric rotating guide shoe 10 by gravity using a traction cable 30. Simultaneously, the traction cable 30 provides electrical control, enabling the drive mechanism 13 to rotate the guide shoe head 12, thereby reducing friction and resistance, and making it easier to lower the instrument body 20 to the preset depth.

[0061] In the specific operation process, the wellbore can be purged and thoroughly flushed before the electric rotary guide shoe 10 is lowered into the well to ensure unobstructed flow. The original data of the wellbore can be viewed, and the lowering depth of the instrument body 20 (i.e., the preset depth mentioned in this document) can be verified or designed. Simultaneously, the rotation of the guide shoe head 12 of the electric rotary guide shoe 10 should be checked, the looseness of the pressure bearing 16 should be inspected, the electrical connection between the electric rotary guide shoe 10 and the instrument body 20 should be tested and adjusted, and the rotation status of the drive mechanism 13 should be tested.

[0062] As described above, after the wellbore quality testing instrument disclosed in this embodiment of the invention is lowered into the wellbore, the electric rotating guide shoe 10 can be continuously kept in a rotating state at the guide shoe head 12, so that it can be lowered quickly regardless of whether it encounters obstruction. Of course, in the actual lowering process, the wellbore quality testing instrument does not always encounter obstruction. If the wellbore quality testing instrument does not encounter obstruction (for example, in a vertical well section), it is not necessary to start the electric rotating guide shoe 10, and the guide shoe head 12 does not need to be in a rotating state. If obstruction is encountered or the instrument enters a directional well section, the electric rotating guide shoe 10 needs to be started. The output torque of the drive mechanism 13 is controlled by the controller on the ground, and the instrument can be repeatedly lowered by lifting upwards until the instrument body 20 is lowered to the preset depth and various wellbore quality tests are performed. It should be noted that the wellbore quality testing instrument's parameter detection of the wellbore and the wellbore quality analysis based on the detected parameters are well-known technologies and will not be described in detail here.

[0063] The wellbore quality testing instrument disclosed in this embodiment of the invention may further include a torque detection unit. The torque detection unit is used to detect the actual torque load of the guide shoe head 12 during rotation, and to control the output torque of the drive mechanism 13 by controlling the current intensity of the drive mechanism 13, so that the output torque can better overcome the actual torque load and improve the guiding passability of the electric rotating guide shoe 10.

[0064] Of course, it should be noted that, given the technical effects of the electric rotating guide shoe 10 described in the above embodiments, the wellbore quality testing instrument disclosed in the embodiments of the present invention also has corresponding technical effects. The discussion of the technical effects can be referred to above, and for the sake of brevity, it will not be repeated here.

[0065] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. An electrically operated rotating shoe, characterized in that, The electric rotating guide shoe (10) is applied to a wellbore quality testing instrument. The wellbore quality testing instrument includes the electric rotating guide shoe (10) and the instrument body (20). The electric rotating guide shoe (10) includes a connector (11), a guide shoe head (12), and a drive mechanism (13). The first end of the guide shoe head (12) is rotatably connected to the first end of the connector (11). The second end of the connector (11) is used to connect to the instrument body (20). The drive mechanism (13) is located inside the connector (11) and connected to the guide shoe head (12). The drive mechanism (13) is used to drive the guide shoe head (12) to rotate relative to the connector (11).

2. The electrically rotating guide shoe according to claim 1, characterized in that, The electric rotating guide shoe (10) also includes a plurality of anti-abrasion devices (14), which are distributed at intervals in the rotation direction of the guide shoe head (12) and fixed on the guide shoe head (12), with a guide groove (15) formed between two adjacent anti-abrasion devices (14).

3. The electrically rotating guide shoe according to claim 2, characterized in that, The anti-wear device (14) includes a base (141) and a plurality of hard alloy blocks (142) distributed on the base (141), the base (141) being fixed on the toe of the shoe (12).

4. The electrically rotating guide shoe according to claim 2, characterized in that, The plurality of anti-abrasion devices (14) are inclined relative to the guiding direction of the shoe head (12).

5. The electrically rotating guide shoe according to claim 1, characterized in that, The connector (11) is rotatably connected to the shoe head (12) via a pressure bearing (16).

6. The electrically rotating guide shoe according to claim 1, characterized in that, The connector (11) is a cylindrical structure. The port at the first end of the connector (11) is used to connect with the instrument body (20). The port at the second end of the connector (11) is rotatably connected with the shoe head (12). The shoe head (12) has an inner cavity (121). The cylindrical cavity (111) of the connector (11) is connected to the inner cavity (121). The driving mechanism (13) includes a drive motor. The drive motor includes a motor body (131) and a power output shaft (132) connected thereto. The motor body (131) is fixed in the cylindrical cavity (111). The power output shaft (132) extends into the inner cavity (121) and is fixedly connected to the inner wall of the inner cavity (121).

7. The electrically rotating guide shoe according to claim 6, characterized in that, The motor body (131) is fixed in the cylindrical cavity (111) by a threaded connection; the electric rotating guide shoe (10) also includes an elastic coupling (17), the elastic coupling (17) is fixedly connected to the inner wall of the inner cavity (121), the first end of the power output shaft (132) is rotatably connected to the motor body (131), and the second end of the power output shaft (132) is fixedly connected to the elastic coupling (17).

8. The electrically rotating guide shoe according to claim 7, characterized in that, The electric rotating guide shoe (10) also includes a support base (18), which is provided with a threaded hole and an external thread. The support base (18) is fixedly connected to the inner cavity (121) by the external thread and the second end of the power output shaft (132) is fixedly connected to the threaded hole by the threaded engagement.

9. The electrically rotating guide shoe according to claim 7, characterized in that, The electric rotating guide shoe (10) also includes an elastic retaining ring (191), a bolt (192), and a shock-absorbing bearing (193); the outer rings (1931) of the elastic retaining ring (191) and the shock-absorbing bearing (193) are both fixed in the cylindrical cavity (111) and are respectively located on opposite sides of the motor body (131). The motor body (131) is positioned and engaged with the elastic retaining ring (191). The inner ring (1932) of the shock-absorbing bearing (193) is sleeved on the power output shaft (132) and rotates with the power output shaft (132) relative to the outer ring (1931) of the shock-absorbing bearing (193). The bolt (192) passes through the elastic retaining ring (191) and the motor body (131) and is fixedly connected to the outer ring (1931) of the shock-absorbing bearing (193).

10. A wellbore quality testing instrument, characterized in that, The device includes a traction cable (30), an instrument body (20), and an electric rotating guide shoe (10) according to any one of claims 1-9. The connector (11) is connected to the instrument body (20), the instrument body (20) is electrically connected to the drive mechanism (13), and one end of the traction cable (30) is electrically connected to the instrument body (20).

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