A mechanical quasi-static push-pull vertical drilling tool for coring

Abstract

The present invention discloses a mechanical quasi-static push-to-pull vertical drilling tool that can be used for coring, and relates to the technical field of drilling tools. The stable platform housing of the tool is connected to a drill bit joint through an intermediate rotating housing, and the drill bit joint is used to connect the drill bit. During the drilling process, the drilling pressure and torque are transmitted to the drill bit through the stable platform housing, the intermediate transmission housing and the drill bit joint, and there is no need to set an inner drill rod. The center of the tool has a space for arranging a coring barrel, which can realize coring while vertical drilling, and the tool has good miniaturization capability, and can be used for vertical coring drilling of small-diameter wellbores. In addition, the actuator of the tool can remain stationary or rotate slowly during the deflection correction process, which effectively reduces the wear rate of the push-to-pull ribs and increases the service life of the tool. In addition, during the deflection correction process, the push-to-pull ribs located on the high side of the wellbore are always in an open state, without lag time, and the push-to-pull force responds quickly, and can be used in conjunction with an impregnated coring drill bit under high-speed conditions.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, in particular to a mechanical quasi-static pushing vertical drilling tool that can be used for coring. Background Art

[0002] At present, as an important means of resource and environmental exploration, the research field of drilling engineering is extending from the traditional surface to the polar regions, oceans, deep earth and the bottom of the ocean. Deep drilling will be an important means of deep earth exploration and the only way to obtain real objects deep in the earth. However, in the process of deep drilling, how to keep the wellbore vertical is a major problem. The problem of well inclination will directly restrict the drilling speed and drilling quality, and even the success or failure of the entire drilling project.

[0003] The emergence of automatic vertical drilling tools has brought about a major technological breakthrough in deflection prevention and correction. It can realize active deflection prevention and correction underground, and automatically track the predetermined wellbore trajectory without human intervention. It can successfully solve the problem of deflection prevention and correction in high-steep structures and complex formations with large dips. While ensuring the quality of the wellbore, it can release drilling pressure and increase the mechanical drilling speed.

[0004] The automatic vertical drilling tool is mainly composed of two parts: one is the stable platform, and the other is the actuator. The stable platform is a dynamic stable control system that controls the vertical drilling tool to achieve inclination measurement and correction. The actuator responds to the control signal of the stable platform and provides the drill bit with the force and angle required for inclination reduction. If the stable platform is regarded as the "brain" of the automatic vertical drilling tool, the actuator is the "limbs" of the vertical drilling tool.

[0005] According to the structure of the stabilizing platform, vertical drilling tools can be divided into mechanical and electronically controlled types. The former uses the eccentric moment generated by the gravity of the pendulum assembly or the eccentric weight mechanism to monitor the well inclination and drive the mechanical valve to control the action of the lower actuator. The electronically controlled type uses high-precision sensors (three-axis accelerometer, flux gate) to monitor the well inclination and control the actuator through a solenoid valve or a motor to drive the disc valve. The mechanical stabilizing platform has a simple structural design and does not contain electronic components, which reduces the requirements of the drill bit for sealing. It has low design, manufacturing and subsequent maintenance costs, high reliability, strong high temperature resistance, and can withstand greater vibration and impact. Therefore, it is mainly used in deep, high-temperature and high-pressure drilling environments.

[0006] According to whether the actuator rotates, vertical drilling tools can be divided into dynamic push-to-pull type and static push-to-pull type. Dynamic push-to-pull type means that the actuator rotates with the drill string during drilling, and the stable platform controls it to rotate to the high side of the wellbore to provide guiding force. In contrast, the static push-to-pull actuator does not rotate with the drill string during drilling (or rotates at a very small rate), but is relatively stable in a fixed position to provide a guiding force of constant size and direction.

[0007] The existing dynamic push-pull automatic vertical drilling tools, due to the inherent characteristics of dynamic push-pull, when the drilling tool is working, the push-pull ribs rotate with the drill bit, there is sliding friction with the well wall, and severe wear. The push-pull ribs take a certain amount of time to open and retract (filling and draining the drilling fluid), which causes control lag in the tool, resulting in a certain degree of correction error, and the working speed should not be too high.

[0008] Due to the inherent characteristics of static push-pull type automatic vertical drilling tools, the drilling pressure and torque on the drill bit need to be transmitted through the inner drill rod that runs through the center of the tool. The inner drill rod occupies a large amount of space inside the tool, making it impossible to arrange a coring barrel in the center of the tool, and the coring function cannot be realized. In addition, the miniaturization capability is poor.

[0009] Therefore, there is an urgent need for a vertical drilling tool that can arrange a core barrel, has good miniaturization capability, has a low wear rate of the push-to-rib, has a rapid push-to-force response, and can be used under high-speed conditions. Summary of the invention

[0010] In order to solve the above technical problems, the present invention provides a mechanical quasi-static pushing vertical drilling tool for coring that can be arranged with a coring barrel, has good miniaturization capability, low pushing rib wear rate, rapid pushing force response, and can be used under high speed conditions.

[0011] To achieve the above object, the present invention provides the following solutions:

[0012] The present invention provides a mechanical quasi-static push-to-pull vertical drilling tool that can be used for coring, comprising: a stabilizing platform, which comprises a stabilizing platform shell, a lower disc valve and an eccentric weight assembly, wherein the two ends of the stabilizing platform shell are respectively provided with a liquid inlet and a liquid outlet that are connected to the interior thereof, the lower disc valve is used to block the liquid outlet, the lower disc valve is provided with a plurality of first flow channels and a plurality of second flow channels, and the eccentric weight assembly is arranged inside the stabilizing platform shell; an intermediate transmission mechanism, which comprises an intermediate transmission shell and a ring valve assembly, wherein one end of the intermediate transmission shell is provided with a liquid outlet connected to the stabilizing platform shell One end of the valve is fixedly connected, one end of the second flow channel is connected to the internal annulus of the stable platform housing, and the other end is connected to the internal annulus of the intermediate transmission housing. A plurality of third flow channels are circumferentially arranged on the side wall of the intermediate transmission housing. The ring valve assembly is sleeved on the outer side wall of the intermediate transmission housing. The ring valve assembly is provided with a plurality of flow channel bodies, one of the first flow channel is connected to one of the third flow channels, and one of the third flow channels is connected to one of the flow channel bodies; an actuator, which includes an actuator body and a plurality of push-against ribs, and the actuator body is sleeved on the outer side of the intermediate transmission housing. The outer wall of the actuator body is provided with a plurality of mounting grooves in the circumferential direction, and a pushing rib is installed in one of the mounting grooves. A circular arc groove surface is provided on one side of the mounting groove, and a circular arc cylinder is provided on one side of the pushing rib. The circular arc cylinder is installed in the circular arc groove surface. The pushing rib can rotate around the axis of the circular arc cylinder. A first groove is provided on the side of the pushing rib opposite to the bottom surface of the mounting groove. The first groove is used as a drilling fluid chamber. The actuator body is provided with a plurality of sixth flow channels. One end of one of the sixth flow channels is connected to one of the flow channel bodies. The first end is connected to the wellbore, and the other end is connected to one of the drilling fluid chambers; when the mechanical quasi-static pushing vertical drilling tool that can be used for coring is tilted, the eccentric weight component makes one end of one or more of the multiple first flow channels located on the high side of the wellbore connected to the internal annulus of the stable platform shell, and the other end is connected to one or more of the multiple drilling fluid chambers located on the high side of the wellbore through one of the third flow channels, one of the flow channel bodies and a sixth flow channel in sequence; a drill bit joint for connecting a drill bit, which is connected and fixedly connected to one end of the intermediate transmission shell away from the stable platform shell.

[0013] Preferably, the eccentric weight assembly includes a eccentric weight block and an upper disc valve, the eccentric weight block is rotatably arranged around its own axis inside the stable platform shell, a gap for drilling fluid to flow through is arranged between the outer wall of the eccentric weight block and the inner wall of the stable platform shell, the upper disc valve is transmission-connected to one end of the eccentric weight block close to the liquid outlet so that the upper disc valve can rotate synchronously with the eccentric weight block, the opposite surfaces of the lower disc valve and the upper disc valve fit each other, the upper disc valve is provided with a liquid supply hole, the liquid supply hole corresponds to the eccentric weight side of the eccentric weight block, the first end of the liquid supply hole passes through the side wall of the upper disc valve and is connected with the internal annulus of the stable platform shell, and the second end passes through the bottom surface of the upper disc valve, when the mechanical quasi-static push-pull vertical drilling tool that can be used for coring is tilted, the second end of the liquid supply hole is connected to one end of one or more of the multiple first flow channels located on the high side of the wellbore.

[0014] Preferably, the ring valve assembly includes an outer ring valve and an inner ring valve, the flow channel body includes a fourth flow channel, an annular groove and a fifth flow channel connected in sequence, the inner ring valve sleeve is arranged on the outer side wall of the intermediate transmission housing and fixedly connected to the intermediate transmission housing, the side wall of the inner ring valve at one end close to the actuator is circumferentially provided with a plurality of the fourth flow channels and a plurality of the annular grooves, one end of a fourth flow channel is connected to a third flow channel, and the other end is connected to an annular groove, the outer ring valve sleeve is arranged on the outer side wall of the inner ring valve at one end close to the actuator, the outer ring valve is provided with a plurality of the fifth flow channels, one end of a fifth flow channel is connected to an annular groove, and the other end is connected to a sixth flow channel.

[0015] Preferably, the liquid supply hole is an arc-shaped hole, and the central angle of the arc-shaped hole is 120 degrees, the number of the first flow channel, the second flow channel, the third flow channel, the fourth flow channel and the annular groove are all 3, the 3 first flow channels and the 3 second flow channels are all evenly arranged along the circumference of the lower disc valve, the 3 third flow channels are evenly arranged along the circumference of the side wall of the intermediate transmission housing, the 3 fourth flow channels and the 3 annular grooves are all evenly arranged along the circumference of the side wall of the inner ring valve, and the central angle of the annular groove is 60 degrees, the number of the fifth flow channel and the sixth flow channel is 6, the 6 fifth flow channels are evenly arranged along the circumference of the outer ring valve, and the 6 sixth flow channels are evenly arranged along the circumference of the side wall of the actuator.

[0016] Preferably, the execution body includes an upper body and a lower body, and three installation grooves are arranged circumferentially on the outer wall of the upper body and the outer wall of the lower body, and the circumferential angle between the installation groove arranged on the upper body and the adjacent installation groove arranged on the lower body is 60 degrees, one end of the upper body is connected to the lower body through a connecting sleeve, an upper end cover is arranged on the end of the upper body away from the connecting sleeve, and a lower end cover is arranged on the end of the lower body away from the connecting sleeve, the upper end cover and the surface opposite to the outer ring valve are fitted with each other, and the upper end cover, the upper body, the connecting sleeve, the lower body and the lower end cover are all sleeved on the intermediate transmission housing.

[0017] Preferably, the upper end cover is mounted on the intermediate transmission housing through an upper angular contact ball bearing, and the lower end cover is mounted on the intermediate transmission housing through a lower angular contact ball bearing, the upper body is mounted on the intermediate transmission housing through an upper needle bearing, and the lower body is mounted on the intermediate transmission housing through a lower needle bearing.

[0018] Preferably, an upper rotating shaft and a lower rotating shaft are respectively provided at both ends of the eccentric weight block, the upper rotating shaft sleeve is provided with an upper bearing, the lower rotating shaft sleeve is provided with a lower bearing, an upper bearing seat and a lower bearing seat respectively matched with the upper bearing and the lower bearing are provided inside the stable shell, and a second groove is provided on one side of the eccentric weight block which is in the same position as the liquid supply hole.

[0019] Preferably, diamond composite sheets are provided on the surfaces opposite to each other of the lower disc valve and the upper disc valve, and the two diamond composite sheets are bonded to each other.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] The mechanical quasi-static push-to-pull vertical drilling tool for coring disclosed by the present invention has a stable platform housing connected to a drill bit joint through an intermediate rotating housing, and the drill bit joint is used to connect the drill bit. During the drilling process, the drilling pressure and torque are transmitted to the drill bit through the stable platform housing and the transmission housing, and there is no need to set an inner drill rod. The center of the mechanical quasi-static push-to-pull vertical drilling tool for coring has a space for arranging a coring barrel, which can realize coring while vertical drilling, and the tool has good miniaturization capability, and can be used for vertical coring drilling of small-diameter wells. In addition, the actuator of the tool can remain stationary or rotate slowly during the deflection correction process. Compared with the push-to-pull ribs of the dynamic push-to-pull drilling tool that rotates with the drill bit, the wear rate of the push-to-pull ribs is effectively reduced, and the service life of the tool is increased. In addition, during the deflection correction process, the push-to-pull ribs located on the high side of the wellbore are always in an open state, without lag time, and the push-to-pull force responds quickly, and can be used in conjunction with the impregnated coring drill bit under high speed conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is an overall cross-sectional view of a mechanical quasi-static push-to-pull vertical drilling tool that can be used for coring provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of an upper disc valve is provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the structure of a lower disc valve is provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the structure of an inner ring valve is provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the structure of an outer ring valve is provided in an embodiment of the present invention;

[0028] Figure 6 A three-dimensional diagram of an actuator according to an embodiment of the present invention;

[0029] Figure 7 It is a cross-sectional view of the upper body in an embodiment of the present invention.

[0030] Explanation of reference numerals: 1. Stable platform housing; 2. Upper bearing seat; 3. Upper bearing; 4. Weight block; 5. Lower bearing seat; 6. Lower bearing; 7. Rubber block; 8. Upper disc valve; 81. Liquid supply hole; 9. Lower disc valve; 91. First flow channel; 92. Second flow channel; 10. Intermediate transmission housing; 101. Third flow channel; 11. Inner ring valve; 111. Annular groove; 112. Fourth flow channel; 12. Outer ring valve; 121. Fifth Flow channel; 13. Upper end cover; 14. Upper body; 15. Upper angular contact bearing; 16. Push-against wing rib; 17. Connecting sleeve; 18. Lower body; 19. Upper needle roller bearing; 20. Sixth flow channel; 21. Lower needle roller bearing; 22. Lower end cover; 23. Lower angular contact bearing; 24. Drill bit joint; 25. Diamond composite sheet; 26. Drilling fluid chamber; 27. Circular arc cylinder; 28. Sealing block; 29. ​​Drain flow channel. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The purpose of the present invention is to provide a mechanical quasi-static push-pull vertical drilling tool for coring which can be used under high speed conditions and can be arranged with a coring barrel, has good miniaturization capability, low push-pull rib wear rate, rapid push-pull force response, and can be used.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1-7As shown, this embodiment provides a mechanical quasi-static push-to-pull vertical drilling tool that can be used for coring, including: a stable platform, which includes a stable platform shell 1, a lower plate valve 9 and an eccentric weight assembly, the two ends of the stable platform shell 1 are respectively provided with a liquid inlet and a liquid outlet connected to the interior thereof, the lower plate valve 9 is used to block the liquid outlet, the lower plate valve 9 is provided with a plurality of first flow channels 91 and a plurality of second flow channels 92, and the eccentric weight assembly is arranged inside the stable platform shell 1; an intermediate transmission mechanism, which includes an intermediate transmission shell 10 and a ring valve assembly, one end of the intermediate transmission shell 10 is connected to the stable platform shell 1 is fixedly connected with one end of the liquid outlet, one end of the second flow channel 92 is connected with the internal annulus of the stable platform housing 1, and the other end is connected with the internal annulus of the intermediate transmission housing 10, a plurality of third flow channels 101 are circumferentially arranged on the side wall of the intermediate transmission housing 10, the ring valve assembly is sleeved on the outer side wall of the intermediate transmission housing 10, the ring valve assembly is provided with a plurality of flow channel bodies, a first flow channel 91 is connected with a third flow channel 101, and a third flow channel 101 is connected with a flow channel body; the actuator includes an actuator body and a plurality of push-against ribs 16, the actuator body is sleeved on the intermediate transmission housing 10 On the outer wall of the housing 10, the outer wall of the actuator body is circumferentially provided with a plurality of mounting grooves, a pushing rib 16 is installed in one mounting groove, a circular arc groove surface is provided on one side of the mounting groove, a circular arc cylindrical surface 27 is provided on one side of the pushing rib 16, the circular arc cylindrical surface 27 is installed in the circular arc groove surface, the pushing rib 16 can rotate around the axis of the circular arc cylindrical surface 27, the pushing rib 16 is provided with a first groove on the side opposite to the bottom of the mounting groove, the first groove is used as a drilling fluid chamber 26, the actuator body is provided with a plurality of sixth flow channels 20, one end of a sixth flow channel 20 is connected to a flow channel body The first end of the first flow channel 91 is connected to the first end of the drilling fluid chamber 26, and the other end is connected to a drilling fluid chamber 26; when the mechanical quasi-static push-to-pull vertical drilling tool that can be used for coring is tilted, the eccentric weight assembly makes one end of one or more of the multiple first flow channels 91 located at the high side of the wellbore communicate with the internal annulus of the stable platform housing 1, and the other end is connected to one or more of the multiple drilling fluid chambers 26 located at the high side of the wellbore through a third flow channel 101, a flow channel body and a sixth flow channel 20 in sequence; the drill bit joint 24 for connecting the drill bit is connected and fixedly connected to the end of the intermediate transmission housing 10 away from the stable platform housing 1. Specifically, the coring barrel is arranged in the intermediate transmission housing 10. During the drilling process, the drilling pressure and torque are transmitted to the drill bit through the stable platform housing 1 and the transmission housing, and there is no need to set an inner drill rod. The center of the mechanical quasi-static push-to-pull vertical drilling tool that can be used for coring has a space for arranging the coring barrel, which can realize coring while vertical drilling, and the tool has good miniaturization ability, and can be used for vertical coring drilling of small-diameter wellbores.In addition, the actuator of the tool can remain stationary or rotate slowly during the deflection correction process. Compared with the dynamic push-pull drilling tool in which the push-pull ribs rotate together with the drill bit during the deflection correction process, the wear rate of the push-pull ribs 16 is effectively reduced, and the service life of the tool is increased. In addition, during the deflection correction process, the push-pull ribs 16 located on the high side of the wellbore are always in an open state, without lag time, and the push-pull force responds quickly, so it can be used in conjunction with an impregnated core drill bit under high-speed conditions.

[0035] Furthermore, the stabilizing platform housing 1, the intermediate transmission housing 10, and the lower disc valve 9 are fixedly connected. With such an arrangement, during the specific working process, the relative positions of the first flow channel 91 and the third flow channel 101 do not change, and they always correspond to each other one by one and are connected to each other, which effectively avoids the first flow channel 91 and the third flow channel 101 from being staggered.

[0036] Furthermore, a sealing groove is provided at one end of the pushing rib 16 away from the arc-shaped cylindrical surface 27, and a sealing block 28 is installed in the sealing groove. This arrangement improves the sealing effect of the device.

[0037] In this embodiment, if Figure 1-Figure 3 As shown, the eccentric weight assembly includes an eccentric weight block 4 and an upper disc valve 8. The eccentric weight block 4 is rotatably arranged inside the stable platform shell 1 around its own axis. A gap for drilling fluid to flow through is arranged between the outer wall of the eccentric weight block 4 and the inner wall of the stable platform shell 1. The drilling fluid enters the interior of the stable platform shell 1 from the liquid inlet of the stable platform shell 1. The upper disc valve 8 is transmission-connected to one end of the eccentric weight block 4 close to the liquid outlet so that the upper disc valve 8 can rotate synchronously with the eccentric weight block 4. The lower disc valve 9 and the upper disc valve 8 are in contact with each other. The upper disc valve 8 is provided with a liquid supply hole 81. The liquid supply hole 81 corresponds to the eccentric weight side of the eccentric weight block 4. The first end of the liquid supply hole 81 passes through the side wall of the upper disc valve 8 and is connected with the internal annulus of the stable platform shell 1, and the second end passes through the bottom surface of the upper disc valve 8. When the mechanical quasi-static push-pull vertical drilling tool that can be used for coring is tilted, the second end of the liquid supply hole 81 is connected to one end of one or more of the multiple first flow channels 91 located on the high side of the wellbore.

[0038] It should be noted that the purpose of setting the eccentric weight 4 in this embodiment is that under the action of gravity, when tilting occurs, the eccentric weight 4 will be stabilized on the low side of the wellbore, and the eccentric weight 4 will be stabilized on the high side of the wellbore. By making the upper plate valve 8 rotate synchronously with the eccentric weight 4, and making the position of the liquid supply hole 81 of the eccentric weight 4 correspond to the eccentric weight side of the eccentric weight 4, when tilting occurs, the liquid supply hole 81 can be stabilized on the high side of the wellbore, and then control the push-up rib 16 also located on the high side of the wellbore to open. In addition, the eccentric weight side and the eccentric weight side here refer to the two sides of the eccentric weight 4 that are symmetrical about its own axis. The side with light weight is the eccentric weight side, and the side with heavy gravity is the eccentric weight side. Specifically in this embodiment, by setting a second groove on one side of the eccentric weight 4, the weight of one side of the eccentric weight 4 is reduced, and the eccentric weight 4 is formed. The light side.

[0039] Specifically, a boss is provided on the upper disc valve 8, and a third groove matching the boss is provided at one end of the eccentric weight block 4 close to the liquid outlet. In this embodiment, the boss is a rectangular boss, and the third groove is a rectangular groove. The rectangular boss is installed in the rectangular groove to achieve synchronous rotation of the eccentric weight block 4 and the upper disc valve 8, and a rubber block 7 is provided between the rectangular boss and the bottom surface of the rectangular groove. The rubber block 7 can supplement the gap caused by the processing and assembly errors of the third groove and the boss, and play a role in shock absorption.

[0040] An upper rotating shaft and a lower rotating shaft are respectively provided at both ends of the eccentric weight block 4, and the connecting line between the upper rotating shaft and the lower rotating shaft is the axis of the eccentric weight block 4. The upper rotating shaft sleeve is provided with an upper bearing 3, and the lower rotating shaft sleeve is provided with a lower bearing 6. An upper bearing seat 2 and a lower bearing seat 5 which respectively cooperate with the upper bearing 3 and the lower bearing 6 are provided inside the stable shell, and a second groove is provided on the side of the eccentric weight block 4 which has the same position as the liquid supply hole 81.

[0041] In this embodiment, if Figure 4 and Figure 5 As shown, the ring valve assembly includes an outer ring valve 12 and an inner ring valve 11, and the flow channel body includes a fourth flow channel 112, an annular groove 111 and a fifth flow channel 121 which are connected in sequence. The inner ring valve 11 is sleeved on the outer wall of the intermediate transmission housing 10 and fixedly connected to the intermediate transmission housing 10. A plurality of fourth flow channels 112 are circumferentially arranged on the side wall of one end of the inner ring valve 11 close to the actuator, one end of a fourth flow channel 112 is connected to an annular groove 111, and the other end is connected to a third flow channel 101. The outer ring valve 12 is sleeved on the outer wall of one end of the inner ring valve 11 close to the actuator, and a plurality of fifth flow channels 121 are arranged on the outer ring valve 12, one end of a fifth flow channel 121 is connected to an annular groove 111, and the other end is connected to a sixth flow channel 20.

[0042] In this embodiment, if Figure 2As shown, the liquid supply hole 81 is an arc hole, and the center angle of the arc hole is 120 degrees. The number of the first flow channel 91, the second flow channel 92, the third flow channel 101, the fourth flow channel 112 and the annular groove 111 are all 3, the 3 first flow channels 91 and the 3 second flow channels 92 are uniformly arranged along the circumference of the lower disc valve 9, the 3 third flow channels 101 are uniformly arranged along the circumference of the side wall of the intermediate transmission housing 10, the 3 fourth flow channels 112 and the three annular grooves 111 are uniformly arranged along the circumference of the side wall of the inner ring valve 11, and the center angle of the annular groove 111 is 60 degrees, the number of the fifth flow channel 121 and the sixth flow channel 20 is 6, the 6 fifth flow channels 121 are uniformly arranged along the circumference of the outer ring valve 12, and the 6 sixth flow channels 20 are uniformly arranged along the circumference of the side wall of the actuator.

[0043] In this embodiment, if Figure 6-Figure 7 As shown, the execution body includes an upper body 14 and a lower body 18. Three installation grooves are arranged in the circumferential direction of the outer wall of the upper body 14 and the circumferential direction of the outer wall of the lower body 18, and the circumferential angle between the installation groove arranged on the upper body 14 and the adjacent installation groove arranged on the lower body 18 is 60 degrees. One end of the upper body 14 is connected to the lower body 18 through a connecting sleeve 17. An upper end cover 13 is arranged at one end of the upper body 14 away from the connecting sleeve 17, and a lower end cover 22 is arranged at one end of the lower body 18 away from the connecting sleeve 17. The surfaces of the upper end cover 13 and the outer ring valve 12 opposite to each other are in contact with each other. The upper end cover 13, the upper body 14, the connecting sleeve 17, the lower body 18 and the lower end cover 22 are all sleeved on the intermediate transmission housing 10.

[0044] In this embodiment, the upper end cover 13 is sleeved on the intermediate transmission housing 10 through an upper angular contact ball bearing, the lower end cover 22 is sleeved on the intermediate transmission housing 10 through a lower angular contact bearing 23, the upper body 14 is sleeved on the intermediate transmission housing 10 through an upper needle bearing 19, and the lower body 18 is sleeved on the intermediate transmission housing 10 through a lower needle bearing 21. Such an arrangement effectively prevents the upper end cover 13, the upper body 14, the connecting sleeve 17, the lower body 18 and the lower end cover 22 from rotating with the intermediate transmission housing 10.

[0045] In this embodiment, during drilling, the upper disc valve 8 is stabilized at the low side of the wellbore under the influence of the eccentric force of the eccentric weight block 4, and the lower disc valve 9 rotates under the drive of the stable platform housing 1, the intermediate transmission housing 10 and the drill bit joint, and the upper disc valve 8 and the lower disc valve 9 rotate relative to each other to form a friction pair. By arranging diamond composite sheets 25 on the surfaces opposite to the lower disc valve 9 and the upper disc valve 8, two diamond composite sheets 25 are mutually fitted to replace the mutual fitting of the surfaces opposite to the upper disc valve 8 and the lower disc valve 9, so that the friction area between the upper disc valve 8 and the lower disc valve 9 can be reduced, and the friction coefficient of the diamond composite sheet 25 is much smaller than the friction coefficient between metals, which can effectively reduce the friction torque with interference effect on the upper disc valve 8 when the lower disc valve 9 rotates, so that the upper disc valve 8 is more easily stabilized at the low side of the wellbore. In addition, the diamond composite sheet 25 has stronger wear resistance and is not easy to be excessively worn.

[0046] In this embodiment, in order to facilitate the timely discharge of the drilling fluid and prevent the push-against wing rib 16 from opening at an excessively large angle, a plurality of drainage channels 29 for discharging the drilling fluid are provided on the execution body. The drainage channels 29 correspond one-to-one to the drilling fluid chambers 26. When the push-against wing rib opening angle is too large, the two are connected.

[0047] In the specific working process, the stable platform housing 1, the lower disc valve 9, the intermediate transmission housing 10, and the inner ring valve 11 rotate with the drill bit, and the drilling pressure and torque are transmitted to the drill bit through the stable platform housing 1, the intermediate transmission housing 10, and the drill bit joint 24. The outer ring valve 12, the upper end cover 13, the upper body 14 of the actuator, the connecting sleeve 17, the lower body 18 of the actuator, and the lower end cover 22 are isolated from the intermediate transmission housing 10 through the upper angular contact bearing 15, the lower angular contact bearing 23, the upper needle bearing 19, and the lower needle bearing 21, and remain stationary or rotate slowly. When the drilling tool tilts, the eccentric weight 4 rotates and stabilizes at the low side of the wellbore due to the action of gravity, thereby driving the upper disc valve 8 to keep its fluid supply hole 81 at the high side of the wellbore. The drilling fluid enters the interior of the stable platform housing 1 through the liquid inlet, passes through the upper bearing seat 2, the eccentric weight 4 and the lower bearing seat 5, and is divided at the junction of the upper disc valve 8 and the lower disc valve 9. A large amount of drilling fluid enters the intermediate transmission housing 10 through the second flow channel 92 of the lower disc valve 9, enters the annulus at the bottom of the well through the drill bit water hole, and carries the rock cuttings to the ground. The remaining small amount of drilling fluid enters the drilling fluid chamber 26 of the actuator located on the high side of the wellbore through the liquid supply hole 81 on the upper disc valve 8, the first flow channel 91, the third flow channel 101, the fourth flow channel 112 within the range of the liquid supply hole 81 at this moment, and the fifth flow channel 121 within the range of the annular groove 111 at this moment, and is discharged into the annulus through the gap between the push rib 16 and the upper actuator body 14 or the lower actuator body 18. Under the action of the pressure difference between the inside and outside of the drilling fluid, the push rib 16 on the high side of the wellbore opens and pushes against the well wall, thereby generating a lateral cutting force for the drill bit to correct the deflection. After the push-against rib 16 is opened to a certain angle, the drilling fluid chamber 26 is connected to the drainage channel 29, and the drilling fluid is discharged therefrom. The setting of the drainage channel 29 limits the opening angle of the push-against rib 16, avoiding damage to the actuator due to excessive opening angle.

[0048] In addition, in this embodiment, since the center angle of the liquid supply hole 81 of the upper disc valve 8 is 120 degrees and the number of the first flow channels 91 of the lower disc valve 9 is 3, there is always a first flow channel 91 within the liquid supply hole 81 during the rotation of the drill bit of the lower disc valve 9, so as to maintain the connection of the drilling fluid. Since the center angle of the annular groove 111 of the inner ring valve 11 is 60 degrees and the number of the fifth flow channels 121 of the outer ring valve 12 is 6, there is always a fifth flow channel 121 within the annular groove 111 during the rotation of the inner ring valve 11 as the drill bit rotates, so as to maintain the connection of the drilling fluid. Therefore, during the working process, as the drill bit rotates, the three pushing ribs 16 located on the high side of the wellbore push against the well wall alternately in turn, thereby generating a relatively continuous deflection correction force for the drill bit. This pushing behavior is different from the dynamic pushing mode and the static pushing mode, and is defined as a quasi-static pushing mode here. The quasi-static working characteristics result in the push force generated by the tool to be more continuous and less volatile, resulting in less vibration of the drill bit and better wellbore quality of the drilled wellbore. The smaller vibration also keeps the core taken more intact inside the tool, improving the coring quality of the tool.

[0049] In addition, the actuator is not limited to the structure described in this embodiment. Any actuator that can be mounted on the intermediate transmission housing 10 and cooperate with the intermediate transmission mechanism to achieve pushing against the well wall can be used, for example, a small-diameter coring type vertical drilling tool thrust actuator described in the invention patent with application number CN201910644494.X.

[0050] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A mechanical quasi-static push-to-pull vertical drilling tool for coring, characterized in that: include: A stabilizing platform, comprising a stabilizing platform shell, a lower disc valve and a weight component, wherein both ends of the stabilizing platform shell are respectively provided with a liquid inlet and a liquid outlet communicated with the interior thereof, the lower disc valve is used to block the liquid outlet, the lower disc valve is provided with a plurality of first flow channels and a plurality of second flow channels, and the weight component is arranged inside the stabilizing platform shell; An intermediate transmission mechanism, comprising an intermediate transmission housing and a ring valve assembly, one end of the intermediate transmission housing is fixedly connected to one end of the stable platform housing provided with a liquid outlet, one end of the second flow channel is communicated with an internal annulus of the stable platform housing, and the other end is communicated with an internal annulus of the intermediate transmission housing, a plurality of third flow channels are circumferentially arranged on the side wall of the intermediate transmission housing, the ring valve assembly is sleeved on the outer side wall of the intermediate transmission housing, the ring valve assembly is provided with a plurality of flow channel bodies, one of the first flow channels is communicated with one of the third flow channels, and one of the third flow channels is communicated with one of the flow channel bodies; An actuator, comprising an actuator body and a plurality of push-against ribs, wherein the actuator body is sleeved on the outer side wall of the intermediate transmission housing, the outer side wall of the actuator body is circumferentially provided with a plurality of mounting grooves, one of the mounting grooves is provided with a push-against rib, one side of the mounting groove is provided with a circular arc groove surface, one side of the push-against rib is provided with a circular arc cylindrical surface, the circular arc cylindrical surface is cooperatively installed in the circular arc groove surface, the push-against rib can rotate around the axis of the circular arc cylindrical surface, the push-against rib is provided with a first groove on a side opposite to the bottom surface of the mounting groove, the first groove is used as a drilling fluid chamber, the actuator body is provided with a plurality of sixth flow channels, one end of one of the sixth flow channels is communicated with one of the flow channel bodies, and the other end is communicated with one of the drilling fluid chambers; When the mechanical quasi-static push-to-pull vertical drilling tool for coring is tilted, the eccentric weight assembly makes one end of one or more of the first flow channels located at the high side of the wellbore communicate with the internal annulus of the stable platform shell, and the other end communicates with one or more of the drilling fluid chambers located at the high side of the wellbore through one of the third flow channels, one of the flow channel bodies and one of the sixth flow channels in sequence; A drill bit joint for connecting a drill bit, which is communicated with and fixedly connected to an end of the intermediate transmission housing away from the stable platform housing; The eccentric weight assembly includes an eccentric weight block and an upper disc valve, the eccentric weight block is rotatably arranged inside the stable platform shell around its own axis, a gap for drilling fluid to flow through is arranged between the outer wall of the eccentric weight block and the inner wall of the stable platform shell, the upper disc valve is transmission-connected to one end of the eccentric weight block close to the liquid outlet so that the upper disc valve can rotate synchronously with the eccentric weight block, the opposite surfaces of the lower disc valve and the upper disc valve fit each other, the upper disc valve is provided with a liquid supply hole, the liquid supply hole corresponds to the eccentric weight side of the eccentric weight block, the first end of the liquid supply hole passes through the side wall of the upper disc valve and is connected with the internal annulus of the stable platform shell, and the second end passes through the bottom surface of the upper disc valve, when the mechanical quasi-static pushing vertical drilling tool that can be used for coring is tilted, the second end of the liquid supply hole is connected with one end of one or more of the first flow channels located on the high side of the wellbore; An upper rotating shaft and a lower rotating shaft are respectively arranged at both ends of the eccentric weight block, the upper rotating shaft sleeve is provided with an upper bearing, the lower rotating shaft sleeve is provided with a lower bearing, an upper bearing seat and a lower bearing seat respectively matched with the upper bearing and the lower bearing are arranged inside the housing of the stabilizing platform, and a second groove is arranged on one side of the eccentric weight block which is in the same position as the liquid supply hole; Diamond composite sheets are arranged on the surfaces opposite to the upper disc valve, and the two diamond composite sheets are bonded to each other.

2. The mechanical quasi-static push vertical drilling tool for coring according to claim 1, characterized in that: The ring valve assembly includes an outer ring valve and an inner ring valve, the flow channel body includes a fourth flow channel, an annular groove and a fifth flow channel that are connected in sequence, the inner ring valve sleeve is arranged on the outer side wall of the intermediate transmission housing and is fixedly connected to the intermediate transmission housing, the side wall of one end of the inner ring valve close to the actuator is circumferentially provided with a plurality of the fourth flow channels and a plurality of the annular grooves, one end of a fourth flow channel is connected to a third flow channel, and the other end is connected to an annular groove, the outer ring valve sleeve is arranged on the outer side wall of one end of the inner ring valve close to the actuator, the outer ring valve is provided with a plurality of the fifth flow channels, one end of a fifth flow channel is connected to a annular groove, and the other end is connected to a sixth flow channel.

3. The mechanical quasi-static push vertical drilling tool for coring according to claim 2, characterized in that: The liquid supply hole is an arc-shaped hole, and the central angle of the arc-shaped hole is 120 degrees. The number of the first flow channel, the second flow channel, the third flow channel, the fourth flow channel and the annular groove are all 3. The 3 first flow channels and the 3 second flow channels are evenly arranged along the circumference of the lower disc valve, the 3 third flow channels are evenly arranged along the circumference of the side wall of the intermediate transmission housing, the 3 fourth flow channels and the 3 annular grooves are evenly arranged along the circumference of the side wall of the inner ring valve, and the central angle of the annular groove is 60 degrees. The number of the fifth flow channel and the sixth flow channel is 6. The 6 fifth flow channels are evenly arranged along the circumference of the outer ring valve, and the 6 sixth flow channels are evenly arranged along the circumference of the side wall of the actuator.

4. The mechanical quasi-static push vertical drilling tool for coring according to claim 3, characterized in that: The execution body includes an upper body and a lower body, and three installation grooves are arranged in the circumferential direction of the outer wall of the upper body and the circumferential direction of the outer wall of the lower body, and the circumferential angle between the installation groove arranged on the upper body and the adjacent installation groove arranged on the lower body is 60 degrees. One end of the upper body is connected to the lower body through a connecting sleeve, and an upper end cover is arranged at the end of the upper body away from the connecting sleeve, and a lower end cover is arranged at the end of the lower body away from the connecting sleeve, and the upper end cover is fitted with the surface opposite to the outer ring valve, and the upper end cover, the upper body, the connecting sleeve, the lower body and the lower end cover are all sleeved on the intermediate transmission housing.

5. The mechanical quasi-static push vertical drilling tool for coring according to claim 4, characterized in that: The upper end cover is mounted on the intermediate transmission housing through an upper angular contact ball bearing, the lower end cover is mounted on the intermediate transmission housing through a lower angular contact ball bearing, the upper body is mounted on the intermediate transmission housing through an upper needle bearing, and the lower body is mounted on the intermediate transmission housing through a lower needle bearing.

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