CN111894456A

CN111894456A - Mechanical quasi-static pushing vertical drilling tool for coring

Info

Publication number: CN111894456A
Application number: CN201911225322.5A
Authority: CN
Inventors: 柴麟; 张凯; 刘宝林; 张耀澎; 张龙; 李然然; 何晓东
Original assignee: China University of Geosciences Beijing
Current assignee: China University of Geosciences Beijing
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-11-06

Abstract

The invention discloses a mechanical quasi-static pushing vertical drilling tool for coring, and relates to the technical field of drilling tools. The drilling pressure and the torque are transmitted to the drill bit through the stabilizing platform shell, the middle transmission shell and the drill bit joint in the drilling process, an inner drill rod does not need to be arranged, the center of the tool is provided with a space for arranging the core barrel, the core can be drilled while drilling, the tool is good in miniaturization capability and can be used for vertical core drilling of a small-diameter well hole. In addition, an actuating mechanism of the tool can keep not rotating or slowly rotate in the deviation correction process, the abrasion rate of the pushing wing rib is effectively reduced, the service life of the tool is prolonged, in the deviation correction process, the pushing wing rib positioned on the high side of the borehole is always in an open state, no lag time exists, the pushing force response is rapid, and the tool can be matched with an impregnated coring bit to be used under the high-rotation-speed working condition.

Description

Mechanical quasi-static pushing vertical drilling tool for coring

Technical Field

The invention relates to the technical field of drilling tools, in particular to a mechanical quasi-static pushing vertical drilling tool for coring.

Background

At present, the field of research in drilling engineering as an important means of resource and environmental exploration is extending from the traditional earth's surface to the polar regions, the ocean and the earth's deep parts, the ocean bottom. Deep drilling is an important means for earth deep detection and is a unique method for obtaining earth deep real objects, however, in the process of deep drilling, how to keep a borehole vertical is a big problem, and the problem of well deviation directly restricts the drilling speed and the quality of a drilled hole, even the success or failure of the whole drilling project.

The appearance of the automatic vertical drilling tool brings great technical breakthrough for inclination prevention and correction, can realize active underground inclination prevention and correction, automatically track a preset well track without human intervention, successfully solve the difficult problems of inclination prevention and correction of high-steep-structure and large-inclination-angle complex strata, release drilling pressure and improve the mechanical drilling speed while ensuring the well quality.

The automatic vertical drilling tool mainly comprises two parts: one is a stable platform and the other is an actuating mechanism. The stable platform is a dynamic stable control system for controlling the vertical drilling tool to realize the functions of inclination measurement and inclination correction. The actuator is used for responding to the control signal of the stable platform and providing the acting force and the rotating angle required by the inclination reduction for the drill bit. If the stabilizing platform is considered to be the "brain" of the automatic vertical drilling tool, the actuators are the "limbs" of the vertical drilling tool.

Depending on the structure of the stabilizing platform, drop drilling tools can be divided into mechanical and electrical. The former adopts an eccentric moment generated by the gravity borne by a pendulum assembly or a weight bias mechanism to monitor well deviation and drive a mechanical valve to control the action of a lower actuating mechanism. The electric control mode adopts a high-precision sensor (a triaxial accelerometer and a fluxgate) to monitor well deviation and drives a disc valve to control an actuating mechanism through an electromagnetic valve or a motor. The mechanical stable platform is simple in structural design, does not contain electronic elements, reduces the requirement of the drill bit on sealing, is low in design, manufacture and later maintenance cost, high in reliability and high in high-temperature resistance, can bear larger vibration and impact, and is mainly applied to deep high-temperature and high-pressure drilling environments.

Depending on whether the actuator is rotating, drop-drilling tools can be classified into dynamic thrust and static thrust. The dynamic pushing type means that the actuating mechanism rotates together with the drill string in the drilling process, and the stable platform controls the drill string to rotate to the high side of the well bore so as to provide guiding force for expenditure. In contrast, static push-on actuators do not rotate with the drill string (or at a very small rate) during drilling, but rather are relatively stable providing a constant amount and direction of steering force at a fixed orientation.

The existing dynamic pushing type automatic vertical drilling tool has the inherent characteristic that due to the dynamic pushing, when a drilling tool works, a pushing wing rib rotates along with a drill bit, sliding friction exists between the pushing wing rib and a well wall, and the abrasion is serious. When the pushing wing ribs are opened and retracted (liquid filling and liquid discharging of drilling fluid), certain time is consumed, so that control delay is generated on the tool, a certain degree of deviation correction error is caused, and the working rotating speed is not high enough.

The existing static pushing type automatic vertical drilling tool has the inherent characteristic that due to static pushing, the bit pressure and torque borne by a drill bit need to be transmitted through an inner drill rod penetrating through the center of the tool, the inner drill rod occupies a large amount of space inside the tool, so that a core taking barrel cannot be arranged in the center of the tool, the core taking function cannot be realized, and the miniaturization capability is poor.

Therefore, a vertical drilling tool which can arrange a coring barrel, has good miniaturization capability, low abrasion rate of the pushing wing rib and quick response of the pushing force and can be used under the working condition of high rotating speed is needed at present.

Disclosure of Invention

In order to solve the technical problems, the invention provides a mechanical quasi-static pushing vertical drilling tool which can be used for coring, has good miniaturization capability, low abrasion rate of pushing wing ribs, quick response of pushing force and can be used under the working condition of high rotating speed and can be used for coring.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides a mechanical quasi-static pushing vertical drilling tool for coring, which comprises: the stable platform comprises a stable platform shell, a lower disc valve and a weight bias assembly, wherein a liquid inlet and a liquid outlet which are communicated with the interior of the stable platform shell are respectively arranged at two ends of the stable platform shell, the lower disc valve is used for plugging 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 bias assembly is arranged in the stable platform shell; the middle transmission mechanism comprises a middle transmission shell and a ring valve assembly, one end of the middle transmission shell is fixedly connected with one end, provided with a liquid outlet, of the stable platform shell, one end of the second flow channel is communicated with the internal annular space of the stable platform shell, the other end of the second flow channel is communicated with the internal annular space of the middle transmission shell, a plurality of third flow channels are circumferentially arranged on the side wall of the middle transmission shell, the ring valve assembly is sleeved on the outer side wall of the middle transmission shell and provided with a plurality of flow channel bodies, one first flow channel is communicated with one third flow channel, and one third flow channel is communicated with one flow channel body; the actuating mechanism comprises an actuating main body and a plurality of pushing wing ribs, wherein the actuating main body is sleeved on the outer side wall of the intermediate transmission shell, a plurality of mounting grooves are formed in the outer side wall of the actuating main body in the circumferential direction, one pushing wing rib is mounted in one mounting groove, an arc groove surface is formed in one side of the mounting groove, an arc cylindrical surface is formed in one side of the pushing wing rib and is mounted in the arc groove surface in a matched mode, the pushing wing rib can rotate around the axis of the arc cylindrical surface, a first groove is formed in the side, opposite to the bottom surface of the mounting groove, of the pushing wing rib and serves as a drilling fluid chamber, a plurality of sixth flow channels are formed in the actuating main body, one end of one sixth flow channel is communicated with one flow channel body, and the other end of the sixth flow channel is communicated with; when the mechanical quasi-static sidewall drilling tool capable of being used for coring is inclined, the eccentric weight component enables one or more of the first flow passages positioned at the high side of the borehole to be communicated with the annular space inside the stable platform shell at one end, and the other end is communicated with one or more of the drilling fluid chambers positioned at the high side of the borehole through the third flow passage, the flow passage body and the sixth flow passage in sequence; and the drill bit joint is used for connecting a drill bit, and is communicated and fixedly connected with one end of the intermediate transmission shell, which is far away from the stable platform shell.

Preferably, the weight bias assembly includes a weight bias block and an upper disc valve, the weight bias block is rotatably disposed inside the stable platform housing around its own axis, a gap for drilling fluid to flow through is disposed between an outer side wall of the weight bias block and an inner side wall of the stable platform housing, the upper disc valve is in transmission connection with one end of the weight bias block close to the fluid outlet so that the upper disc valve can rotate synchronously with the weight bias block, opposite surfaces of the lower disc valve and the upper disc valve are attached to each other, the upper disc valve is provided with a fluid supply hole corresponding to the weight bias side of the weight bias block, a first end of the fluid supply hole penetrates through a side wall of the upper disc valve and is in annular communication with the inside of the stable platform housing, a second end of the fluid supply hole penetrates through a bottom surface of the upper disc valve, and when the mechanical quasi-static vertical drilling tool for coring is tilted, the second end of the fluid supply hole and one or more ends of the first flow channels located at a high side of a well bore And (4) communicating.

Preferably, the ring valve assembly includes an outer ring valve and an inner ring valve, the runner body includes a fourth runner, an annular groove and a fifth runner that communicate in proper order, the inner ring valve pocket set up in on the lateral wall of middle transmission shell, and with middle transmission shell fixed connection, the inner ring valve is close to one end lateral wall circumference of executive main body is provided with a plurality of the fourth runner and a plurality of the annular groove, one the one end of fourth runner with one the third runner intercommunication, the other end with one the annular groove intercommunication, the outer ring valve pocket is located the inner ring valve is close to on the one end lateral wall of executive main body, the outer ring valve is provided with a plurality of the fifth runner, one the one end of fifth runner with one the annular groove intercommunication, the other end with one the sixth runner intercommunication.

Preferably, the liquid supply hole is the arc hole, just the central angle of arc hole is 120 degrees, first runner the second runner the third runner the fourth runner and the quantity of ring channel is 3, 3 first runner and 3 the second runner all follows the circumference of lower plate valve evenly sets up, 3 the third runner is followed the lateral wall circumference of middle transmission shell evenly sets up, 3 fourth runner and 3 the ring channel all follows the lateral wall circumference of inner ring valve evenly sets up, just the central angle of ring channel is 60 degrees, the number of fifth runner and the sixth runner is 6, 6 the fifth runner is followed the circumference of outer ring valve evenly sets up, 6 the sixth runner is followed the lateral wall circumference of execution main part evenly sets up.

Preferably, the execution main part includes upper main part and lower floor's main part, the lateral wall circumference of upper main part and the lateral wall circumference of lower floor's main part all is provided with 3 the mounting groove, and set up in upper main part the mounting groove with adjacent set up in the main part of lower floor the circumference contained angle of mounting groove is 60 degrees, the one end of upper main part pass through the adapter sleeve with lower floor's main part is connected, upper main part is kept away from the one end of adapter sleeve is provided with the upper end cover, lower floor's main part is kept away from the one end of adapter sleeve is provided with the lower extreme cover, the upper end cover with the face that the outer loop valve is relative laminates each other, the upper end cover the upper main part the adapter sleeve lower floor's main part and the lower extreme cover all overlaps and locates.

Preferably, the upper end cover is sleeved on the intermediate transmission housing through an upper corner contact ball bearing, the upper end cover and the lower end cover are sleeved on the intermediate transmission housing through a lower corner contact ball bearing, the upper layer main body is sleeved on the intermediate transmission housing through an upper needle bearing, and the lower layer main body is sleeved on the intermediate transmission housing through a lower needle bearing.

Preferably, the both ends of weight piece are provided with pivot and lower pivot respectively, the axle sleeve of going up is equipped with the upper bearing, the axle sleeve of going down is equipped with the lower bearing, stabilize the shell inside be provided with respectively with upper bearing with lower bearing matched with bolster bearing housing and lower bearing housing, just the weight piece with one side that the confession liquid hole has the same position is provided with the second recess.

Preferably, all be provided with the diamond compact piece on the lower disk valve with the relative face of last disk valve, two the diamond compact piece laminates each other.

Compared with the prior art, the invention has the following technical effects:

the invention discloses a mechanical quasi-static pushing vertical drilling tool for coring. In the drilling process, the bit pressure and the torque are transmitted to the drill bit through the stabilizing platform shell and the transmission shell, an inner drill rod is not required to be arranged, the mechanical quasi-static pushing vertical drilling tool for coring leaves a space for arranging a coring barrel at the center, vertical drilling and coring can be realized, the tool has good miniaturization capability, and the tool can be used for vertical coring drilling of small-diameter well bores. In addition, an actuating mechanism of the tool can keep not rotating or slowly rotating in the deviation correction process, compared with the situation that a dynamic pushing drilling tool pushes the wing ribs to rotate along with the drill bit, the abrasion rate of the pushing wing ribs is effectively reduced, the service life of the tool is prolonged, and in the deviation correction process, the pushing wing ribs on the high side of the well bore are always in an open state, no lag time exists, the pushing force response is rapid, and the tool can be matched with an impregnated coring bit to be used under the working condition of high rotating speed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a cross-sectional view of a mechanical quasi-static push against vertical drilling tool useful for coring as provided in an embodiment of the present invention;

FIG. 2 is a schematic diagram of an embodiment of the present invention providing an upper disc valve;

FIG. 3 is a schematic structural diagram of a lower disk valve provided in an embodiment of the present invention;

FIG. 4 is a schematic diagram of an embodiment of the present invention providing an inner ring valve;

FIG. 5 is a schematic diagram of an embodiment of the present invention providing an outer ring valve;

FIG. 6 is a perspective view of an actuator in an embodiment of the present invention;

FIG. 7 is a cross-sectional view of an upper body in an embodiment of the present invention.

Description of reference numerals: 1. a stabilized platform housing; 2. an upper bearing seat; 3. an upper bearing; 4. a deflection block; 5. a lower bearing seat; 6. a lower bearing; 7. a rubber block; 8. an upper disc valve; 81. a liquid supply hole; 9. a lower disc valve; 91 a first flow channel; 92. a second flow passage; 10. an intermediate transmission housing; 101. a third flow path; 11. an inner ring valve; 111. an annular groove; 112. a fourth flow path; 12. an outer ring valve; 121. a fifth flow channel; 13. an upper end cover; 14. an upper body; 15. the upper corner contacts the bearing; 16. pushing against the rib; 17. connecting sleeves; 18. a lower layer main body; 19. an upper needle bearing; 20. a sixth flow path; 21. a lower needle bearing; 22. a lower end cover; 23. the lower corner contacts the bearing; 24. a bit sub; 25. a diamond compact; 26. a drilling fluid chamber; 27. a circular arc-shaped cylindrical surface; 28. a sealing block; 29. and a liquid drainage flow channel.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention aims to provide a mechanical quasi-static pushing vertical drilling tool which can be used for arranging a coring barrel, has good miniaturization capability, low abrasion rate of pushing wing ribs and quick response of pushing force, and can be used for coring under the working condition of high rotating speed.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

As shown in fig. 1-7, the present embodiment provides a mechanical quasi-static push against vertical drilling tool useful for coring, comprising: the stabilizing platform comprises a stabilizing platform shell 1, a bottom disc valve 9 and a weight bias assembly, wherein a liquid inlet and a liquid outlet which are communicated with the interior of the stabilizing platform shell 1 are respectively arranged at two ends of the stabilizing platform shell 1, the bottom disc valve 9 is used for plugging the liquid outlet, the bottom disc valve 9 is provided with a plurality of first flow passages 91 and a plurality of second flow passages 92, and the weight bias assembly is arranged in the stabilizing platform shell 1; the middle transmission mechanism comprises a middle transmission shell 10 and a ring valve assembly, one end of the middle transmission shell 10 is fixedly connected with one end, provided with a liquid outlet, of the stable platform shell 1, one end of a second flow channel 92 is communicated with the inner annular space of the stable platform shell 1, the other end of the second flow channel is communicated with the inner annular space of the middle transmission shell 10, a plurality of third flow channels 101 are circumferentially arranged on the side wall of the middle transmission shell 10, the ring valve assembly is sleeved on the outer side wall of the middle transmission shell 10 and provided with a plurality of flow channel bodies, one first flow channel 91 is communicated with one third flow channel 101, and one third flow channel 101 is communicated with one flow channel body; the actuating mechanism comprises an actuating main body and a plurality of pushing wing ribs 16, wherein the actuating main body is sleeved on the outer side wall of the middle transmission shell 10, a plurality of mounting grooves are formed in the circumferential direction of the outer side wall of the actuating main body, one pushing wing rib 16 is mounted in one mounting groove, an arc-shaped groove surface is formed in one side of the mounting groove, an arc-shaped cylindrical surface 27 is formed in one side of the pushing wing rib 16, the arc-shaped cylindrical surface 27 is mounted in the arc-shaped groove surface in a matched mode, the pushing wing rib 16 can rotate around the axis of the arc-shaped cylindrical surface 27, a first groove is formed in the side, opposite to the bottom surface of the mounting groove, of the pushing wing rib 16 and serves as a drilling fluid chamber 26, the actuating main body is provided with a plurality of sixth flow channels; when the mechanical quasi-static push vertical drilling tool which can be used for coring is inclined, the biasing assembly enables one or more of the first flow passages 91 positioned at the high side of the borehole to be communicated with the annular space inside the stable platform shell 1 at one end, and the other end is communicated with one or more of the drilling fluid chambers 26 positioned at the high side of the borehole through the third flow passage 101, the flow passage body and the sixth flow passage 20 in sequence; and a bit joint 24 for connecting a bit, which is communicated with one end of the middle transmission shell 10 far away from the stable platform shell 1 and is fixedly connected with the middle transmission shell. In particular, the core barrel is disposed within the intermediate transmission housing 10. In the drilling process, the bit pressure and the torque are transmitted to the drill bit through the stabilizing platform shell 1 and the transmission shell without arranging an inner drill rod, the mechanical quasi-static pushing vertical drilling tool for coring leaves a space for arranging a coring barrel at the center, can realize vertical drilling and coring, has good miniaturization capability and can be used for vertical coring drilling of small-diameter well bores. In addition, an actuating mechanism of the tool can keep not rotating or slowly rotating in the deviation rectifying process, compared with the situation that the pushing wing ribs rotate together with the drill bit in the deviation rectifying process of the dynamic pushing drilling tool, the abrasion rate of the pushing wing ribs 16 is effectively reduced, the service life of the tool is prolonged, in the deviation rectifying process, the pushing wing ribs 16 positioned on the high side of the well bore are always in an open state, no lag time exists, the pushing force response is rapid, and the tool can be matched with an impregnated coring bit to be used under the working condition of high rotating speed.

Further, the stable platform housing 1, the intermediate transmission housing 10 and the lower disc valve 9 are fixedly connected. By the arrangement, in the specific working process, the relative positions of the first flow channel 91 and the third flow channel 101 are not changed, and the first flow channel 91 and the third flow channel 101 are always in one-to-one correspondence and are communicated with each other, so that the situation that the first flow channel 91 and the third flow channel 101 are staggered is effectively avoided.

Further, one end of the pushing wing rib 16 far away from the circular arc cylindrical surface 27 is provided with a sealing groove, and a sealing block 28 is installed in the sealing groove. So set up, improved the sealed effect of device.

In the embodiment, as shown in fig. 1-3, the weight bias assembly includes a weight bias 4 and an upper disc valve 8, the weight bias 4 is rotatably disposed inside the stabilized platform housing 1 around its own axis, a gap for drilling fluid to flow through is disposed between the outer side wall of the weight bias 4 and the inner side wall of the stabilized platform housing 1, the drilling fluid enters the stabilized platform housing 1 from the fluid inlet of the stabilized platform housing 1, the upper disc valve 8 is in transmission connection with one end of the weight bias 4 close to the fluid outlet so that the upper disc valve 8 can rotate synchronously with the weight bias 4, the opposite surfaces of the lower disc valve 9 and the upper disc valve 8 are attached to each other, the upper disc valve 8 is provided with a fluid supply hole 81, the fluid supply hole 81 corresponds to the weight bias side of the weight bias 4, a first end of the fluid supply hole 81 penetrates through the side wall of the upper disc valve 8 to communicate with the annular space inside the stabilized platform housing 1, a second end penetrates the bottom surface of the upper disc valve 8, when a mechanical quasi, the second end of the liquid supply hole 81 communicates with one end of one or more of the plurality of first flow channels 91 located at the high side of the wellbore.

It should be noted that the purpose of the weight bias 4 in this embodiment is to stabilize the weight bias side of the weight bias 4 at the low side of the wellbore and the weight bias side of the weight bias 4 at the high side of the wellbore when the inclination occurs, by rotating the upper disc valve 8 and the weight bias 4 synchronously and positioning the fluid supply hole 81 of the weight bias 4 corresponding to the weight bias side of the weight bias 4, the fluid supply hole 81 can be stabilized at the high side of the wellbore when the inclination occurs, and the opening of the thrust rib 16 also positioned at the high side of the wellbore can be controlled. Here, the heavy side and the light side refer to both sides of the weight 4 that are symmetrical about its own axis, and the light side is the light side and the heavy side is the heavy side. Specifically, in the present embodiment, by providing the second groove on one side of the weight 4, the weight of one side of the weight 4 is reduced, and the formation of the light side of the weight 4 is performed.

Specifically, a boss is arranged on the upper disc valve 8, a third groove matched with the boss is arranged at one end, close to the liquid outlet, of the weight bias block 4, the boss is a rectangular boss in the embodiment, the third groove is a rectangular groove, the synchronous rotation of the weight bias block 4 and the upper disc valve 8 is realized by installing the rectangular boss in the rectangular groove, a rubber block 7 is arranged between the rectangular boss and the bottom surface of the rectangular groove, and the rubber block 7 can supplement a gap caused by processing and assembling errors of the third groove and the boss and has a damping effect;

the two ends of the weight deviation block 4 are respectively provided with an upper rotating shaft and a lower rotating shaft, the connecting line of the upper rotating shaft and the lower rotating shaft is the axis of the weight deviation block 4, the upper rotating shaft is provided with an upper bearing 3, the lower rotating shaft is provided with a lower bearing 6, an upper bearing seat 2 and a lower bearing seat 5 which are respectively matched with the upper bearing 3 and the lower bearing 6 are arranged inside the stabilizing shell, and a second groove is formed in one side of the weight deviation block 4, which has the same position with the liquid supply hole 81.

In this embodiment, as shown in fig. 4 and 5, the ring valve assembly includes an outer ring valve 12 and an inner ring valve 11, the flow path body includes a fourth flow path 112, an annular groove 111 and a fifth flow path 121 which are sequentially communicated, the inner ring valve 11 is sleeved on the outer side wall of the intermediate transmission housing 10 and is fixedly connected with the intermediate transmission housing 10, a plurality of fourth flow paths 112 are circumferentially arranged on the side wall of one end of the inner ring valve 11 close to the actuating body, one end of one fourth flow path 112 is communicated with one annular groove 111, the other end is communicated with one third flow path 101, the outer ring valve 12 is sleeved on the outer side wall of one end of the inner ring valve 11 close to the actuating body, the outer ring valve 12 is provided with a plurality of fifth flow paths 121, one end of one fifth flow path 121 is communicated with one annular groove 111, and the other end is communicated with one sixth.

In this embodiment, as shown in FIG. 2, the liquid supply hole 81 is an arc-shaped hole, and the central angle of the arc-shaped 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 is 3, 3 first flow channels 91 and 3 second flow channels 92 are all uniformly arranged along the circumferential direction of the lower disc valve 9, 3 third flow channels 101 are uniformly arranged along the circumferential direction of the side wall of the middle transmission housing 10, 3 fourth flow channels 112 and three annular grooves 111 are all uniformly arranged along the circumferential direction of the side wall of the inner ring valve 11, the central 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, 6 fifth flow channels 121 are uniformly arranged along the circumferential direction of the

outer ring valve

12, and 6 sixth flow channels 20 are uniformly arranged along the circumferential direction of the side wall of the execution main body.

In this embodiment, as shown in fig. 6 to 7, the actuator body includes an upper body 14 and a lower body 18, 3 mounting grooves are respectively disposed in the circumferential direction of the outer sidewall of the upper body 14 and the circumferential direction of the outer sidewall of the lower body 18, a circumferential included angle between a mounting groove disposed on the upper body 14 and an adjacent mounting groove disposed 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 disposed at one end of the upper body 14 away from the connecting sleeve 17, a lower end cover 22 is disposed at one end of the lower body 18 away from the connecting sleeve 17, the opposite surfaces of the upper end cover 13 and the outer ring valve 12 are attached to each other, and 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.

In the embodiment, the upper end cap 13 is sleeved on the middle transmission housing 10 through an upper corner contact ball bearing, the lower end cap 22 is sleeved on the middle transmission housing 10 through a lower corner contact bearing 23, the upper layer main body 14 is sleeved on the middle transmission housing 10 through an upper needle bearing 19, and the lower layer main body 18 is sleeved on the middle transmission housing 10 through a lower needle bearing 21. By the arrangement, the situation that the upper end cover 13, the upper-layer main body 14, the connecting sleeve 17, the lower-layer main body 18 and the lower end cover 22 rotate along with the middle transmission shell 10 is effectively avoided.

In this embodiment, during drilling, the upper disc valve 8 is stabilized in the low side position of the borehole under the influence of the eccentric force of the eccentric weight 4, the lower disc valve 9 is driven by the stabilizing platform housing 1, the intermediate transmission housing 10 and the drill bit joint to rotate, the upper disc valve 8 and the lower disc valve 9 rotate relatively to form a friction pair, the diamond compacts 25 are arranged on the opposite surfaces of the lower disc valve 9 and the upper disc valve 8, and the two diamond compacts 25 are bonded to each other to replace the mutual bonding of the opposite surfaces of 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 is reduced, the friction coefficient of the diamond compacts 25 is far smaller than the intermetallic friction coefficient, the friction torque with the interference effect on the upper disc valve 8 during rotation of the lower disc valve 9 can be effectively reduced, and the upper disc valve 8 is more easily stabilized in the low side position of the borehole. In addition, the diamond compact 25 has a higher wear resistance and is less prone to excessive wear.

In the embodiment, in order to facilitate timely discharging of the drilling fluid and prevent the too large opening angle of the pushing rib 16, the execution main body is provided with a plurality of fluid drainage channels 29 for discharging the drilling fluid, the fluid drainage channels 29 correspond to the drilling fluid chambers 26 one by one, and when the opening angle of the pushing rib is too large, the fluid drainage channels are communicated with the drilling fluid chambers 26.

In the specific working process, the stabilizing platform shell 1, the lower disc valve 9, the middle transmission shell 10 and the inner ring valve 11 rotate along with the drill bit, and the bit pressure and the torque are transmitted to the drill bit through the stabilizing platform shell 1, the middle transmission shell 10 and the drill bit joint 24. The outer ring valve 12, the upper end cover 13, the actuator upper layer main body 14, the connecting sleeve 17, the actuator lower layer main body 18 and the lower end cover 22 are isolated from the middle transmission shell 10 through an upper corner contact bearing 15, a lower corner contact bearing 23, an upper needle bearing 19 and a lower needle bearing 21 and are kept still or rotate slowly. When the drilling tool is inclined, the weight bias 4 is rotationally stabilized at the lower side of the borehole due to the gravity, so as to drive the upper disc valve 8 to keep the liquid supply hole 81 at the high side of the borehole. Drilling fluid enters the interior of the stable platform shell 1 from a fluid inlet, flows through the upper bearing seat 2, the weight bias 4 and the lower bearing seat 5 and then 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 middle transmission shell 10 through the second flow passage 92 of the lower disc valve 9 and enters a well bottom annular space through a drill bit water hole to carry rock debris to the ground, and the rest small amount of drilling fluid enters the drilling fluid chamber 26 of the actuating mechanism on the high side of the well hole through the fluid supply hole 81 on the upper disc valve 8, the first flow passage 91, the third flow passage 101, the fourth flow passage 112 and the fifth flow passage 121 which are positioned in the range of the annular groove 111 at the moment and is discharged into the annular space through a gap between the wing rib 16 and the upper actuating mechanism main body 14 or the lower actuating mechanism main body 18. Under the action of the pressure difference between the inside and the outside of the drilling fluid, the pushing wing ribs 16 on the high side of the well bore expand to push against the well wall, so that the lateral cutting force for correcting the drill bit is generated. After the pushing wing rib 16 is opened at a certain angle, the drilling fluid chamber 26 is communicated with the liquid discharge flow channel 29, drilling fluid is discharged from the liquid discharge flow channel 29, and the arrangement of the liquid discharge flow channel 29 limits the opening angle of the pushing wing rib 16, so that damage to an actuating mechanism due to the fact that the opening angle is too large is avoided.

In addition, in this embodiment, since the central 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 one first flow channel 91 in the range of the liquid supply hole 81 in the process of the drill bit rotation of the lower disc valve 9, and the communication of the drilling liquid is maintained. Because the central 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, a certain fifth flow channel 121 always exists in the range of the annular groove 111 in the process that the inner ring valve 11 rotates along with the drill bit, and communication of drilling fluid is kept. Therefore, in the working process, as the drill bit rotates, the 3 pushing wing ribs 16 on the high side of the well hole sequentially and alternately push against the well wall, so that relatively continuous deviation correcting force is generated for the drill bit. This pushing behavior is different from dynamic pushing and static pushing, which is defined herein as quasi-static pushing. The quasi-static working characteristics lead to that the pushing force continuity that the instrument produced is better, and undulant less, make drill bit vibrations less, bore the well bore quality of well hole better, and less vibration makes the coring core preserve comparatively intact in the instrument inside simultaneously, improves instrument coring quality.

In addition, the actuator is not limited to the structure described in the embodiment, and any actuator can be sleeved on the intermediate transmission housing 10 and can be matched with the intermediate transmission mechanism to realize the sidewall pushing, for example, a thrust actuator of a small-diameter coring type vertical drilling tool disclosed in the patent application No. cn201910644494.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. A mechanical quasi-static push against vertical drilling tool useful for coring, comprising:

the stable platform comprises a stable platform shell, a lower disc valve and a weight bias assembly, wherein a liquid inlet and a liquid outlet which are communicated with the interior of the stable platform shell are respectively arranged at two ends of the stable platform shell, the lower disc valve is used for plugging 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 bias assembly is arranged in the stable platform shell;

the middle transmission mechanism comprises a middle transmission shell and a ring valve assembly, one end of the middle transmission shell is fixedly connected with one end, provided with a liquid outlet, of the stable platform shell, one end of the second flow channel is communicated with the internal annular space of the stable platform shell, the other end of the second flow channel is communicated with the internal annular space of the middle transmission shell, a plurality of third flow channels are circumferentially arranged on the side wall of the middle transmission shell, the ring valve assembly is sleeved on the outer side wall of the middle transmission shell and provided with a plurality of flow channel bodies, one first flow channel is communicated with one third flow channel, and one third flow channel is communicated with one flow channel body;

the actuating mechanism comprises an actuating main body and a plurality of pushing wing ribs, wherein the actuating main body is sleeved on the outer side wall of the intermediate transmission shell, a plurality of mounting grooves are formed in the outer side wall of the actuating main body in the circumferential direction, one pushing wing rib is mounted in one mounting groove, an arc groove surface is formed in one side of the mounting groove, an arc cylindrical surface is formed in one side of the pushing wing rib and is mounted in the arc groove surface in a matched mode, the pushing wing rib can rotate around the axis of the arc cylindrical surface, a first groove is formed in the side, opposite to the bottom surface of the mounting groove, of the pushing wing rib and serves as a drilling fluid chamber, a plurality of sixth flow channels are formed in the actuating main body, one end of one sixth flow channel is communicated with one flow channel body, and the other end of the sixth flow channel is communicated with;

when the mechanical quasi-static sidewall drilling tool capable of being used for coring is inclined, the eccentric weight component enables one or more of the first flow passages positioned at the high side of the borehole to be communicated with the annular space inside the stable platform shell at one end, and the other end is communicated with one or more of the drilling fluid chambers positioned at the high side of the borehole through the third flow passage, the flow passage body and the sixth flow passage in sequence;

and the drill bit joint is used for connecting a drill bit, and is communicated and fixedly connected with one end of the intermediate transmission shell, which is far away from the stable platform shell.

2. The mechanical quasi-static sidewall vertical drilling tool for coring as set forth in claim 1, wherein the bias weight assembly comprises a bias weight rotatably disposed in the stabilized platform housing about its axis, a gap for drilling fluid to flow through is disposed between an outer sidewall of the bias weight and an inner sidewall of the stabilized platform housing, the upper disc valve is in driving connection with an end of the bias weight near the fluid outlet so as to enable the upper disc valve to rotate synchronously with the bias weight, a surface of the lower disc valve opposite to the upper disc valve is in contact with a surface of the upper disc valve, the upper disc valve is provided with a fluid supply hole corresponding to the biased weight side, a first end of the fluid supply hole penetrates through a sidewall of the upper disc valve to communicate with an annular space in the stabilized platform housing, and a second end penetrates through a bottom surface of the upper disc valve, when the mechanical quasi-static push-against vertical drilling tool for coring is tilted, the second end of the fluid feed bore communicates with one end of one or more of the first plurality of flow passages located at the high side of the wellbore.

3. The mechanical quasi-static sidewall-pushing vertical drilling tool for coring as set forth in claim 2, wherein the ring valve assembly comprises an outer ring valve and an inner ring valve, the flow passage body comprises a fourth flow passage, a ring groove and a fifth flow passage which are communicated in sequence, the inner ring valve housing is disposed on the outer side wall of the intermediate transmission housing and is fixedly connected with the intermediate transmission housing, the inner ring valve is circumferentially provided with a plurality of the fourth flow passages and a plurality of the ring grooves near the side wall of one end of the execution body, one end of one of the fourth flow passages is communicated with one of the third flow passages, the other end is communicated with one of the ring grooves, the outer ring valve housing is disposed on the outer side wall of one end of the inner ring valve near the execution body, the outer ring valve is provided with a plurality of the fifth flow passages, one end of one of the fifth flow passages is communicated with one of the ring grooves, the other end is communicated with one sixth flow passage.

4. The mechanical quasi-static push against vertical drilling tool for coring of claim 3, it is characterized in that the liquid supply hole is an arc-shaped hole, the central angle of the arc-shaped hole is 120 degrees, the number of the first flow passages, the second flow passages, the third flow passages, the fourth flow passages and the annular grooves is 3, the 3 first flow passages and the 3 second flow passages are all uniformly arranged along the circumferential direction of the lower disc valve, the 3 third flow passages are all uniformly arranged along the circumferential direction of the side wall of the middle transmission shell, the 3 fourth flow passages and the 3 annular grooves are all uniformly arranged along the circumferential direction of the side wall of the inner ring valve, and the central angle of ring channel is 60 degrees, the quantity of fifth runner and sixth runner is 6, 6 the fifth runner is followed the circumference of outer loop valve evenly sets up, 6 the sixth runner is followed the lateral wall circumference of execution main part evenly sets up.

5. The mechanical quasi-static push against vertical drilling tool for coring of claim 4, it is characterized in that the execution main body comprises an upper layer main body and a lower layer main body, 3 installation grooves are respectively arranged on the circumferential direction of the outer side wall of the upper layer main body and the circumferential direction of the outer side wall of the lower layer main body, and the circumferential included angle between the mounting groove arranged on the upper-layer main body and the adjacent mounting groove arranged on the lower-layer main body is 60 degrees, one end of the upper layer main body is connected with the lower layer main body through a connecting sleeve, one end of the upper layer main body far away from the connecting sleeve is provided with an upper end cover, one end of the lower-layer main body, which is far away from the connecting sleeve, is provided with a lower end cover, the opposite surfaces of the upper end cover and the outer ring valve are mutually attached, the upper end cover, the upper main body, the connecting sleeve, the lower main body and the lower end cover are all sleeved on the middle transmission shell.

6. The mechanical quasi-static sidewall contact vertical drilling tool for coring as recited in claim 5, wherein the upper end cap is sleeved on the middle transmission housing by an upper corner contact ball bearing, the lower end cap is sleeved on the middle transmission housing by a lower corner contact ball bearing, the upper body is sleeved on the middle transmission housing by an upper needle bearing, and the lower body is sleeved on the middle transmission housing by a lower needle bearing.

7. The mechanical quasi-static sidewall contact vertical drilling tool for coring as claimed in claim 2, wherein the weight is provided with an upper rotating shaft and a lower rotating shaft at both ends, respectively, the upper rotating shaft is provided with an upper bearing, the lower rotating shaft is provided with a lower bearing, the stabilizing housing is internally provided with an upper bearing seat and a lower bearing seat which are respectively matched with the upper bearing and the lower bearing, and a side of the weight having the same position as the fluid supply hole is provided with a second groove.

8. The mechanical quasi-static push vertical drilling tool for coring as claimed in claim 2, wherein diamond compacts are arranged on the opposite faces of the lower disk valve and the upper disk valve, and the two diamond compacts are attached to each other.