Drilling stick-slip control device

Abstract

The application discloses a drilling stick-slip vibration control device which comprises a mandrel, a drill bit cutting depth regulating mechanism and a rotating nipple, the drill bit cutting depth regulating mechanism is sleeved outside the mandrel, an annular first pressure regulating cavity is formed between the inner wall of the drill bit cutting depth regulating mechanism and the outer wall of the mandrel, and an elastic structural member is filled in the first pressure regulating cavity, the top end of the rotating nipple is rotatably connected with the bottom end of the mandrel, and the bottom end of the rotating nipple is connected with a drilling tool; when the drilling tool is used for drilling, the rotating nipple and the mandrel can move along the axial direction of the mandrel, and the elastic structural member in the first pressure regulating cavity is in a squeezed state. The application solves the technical problem that the stick-slip vibration phenomenon of the drill bit is not controlled well, thereby reducing the drilling efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of drilling engineering, and particularly relates to a drilling stick-slip vibration control device. BACKGROUND

[0002] Stick-slip vibration generally occurs in the drilling engineering in the fields of oil and gas, geothermal, natural gas hydrate, etc., and is a self-excited oscillation phenomenon generated in the process of rock breaking by a PDC bit (i.e., a polycrystalline diamond compact bit), is a common factor restricting safe and efficient drilling in deep and ultra-deep wells and horizontal wells, and is one of the key factors leading to low rock breaking efficiency and failure of downhole drilling tools. With the large-scale application of PDC bits, the problem of stick-slip vibration in the drilling process and its harm are increasingly prominent.

[0003] Low-frequency high-amplitude stick-slip vibration can bring a series of negative effects (such as damage to bit cutting teeth, instability of directional tool face, overload damage to drilling tool joints, fatigue damage to drilling tools, and even breakage of drilling tools) to drilling speed and safety, and has extremely strong destructive power, and has become one of the important risk factors in deep and horizontal well drilling engineering.

[0004] At present, by monitoring the dynamic information (including the surface rotation speed of the drill string, torque information, etc.) of the drill string on the ground, analyzing the stick-slip vibration phenomenon, and adjusting the drilling parameters (including reducing the rotation speed and drilling pressure, etc.), the stick-slip vibration can be reduced, but the disadvantages are that the stick-slip vibration is obtained with a lag, the drilling efficiency is reduced, and the use effect is not ideal.

[0005] In view of the problem that the control effect on the stick-slip vibration phenomenon of the bit is poor in the related art, and the drilling efficiency is reduced, at present, no effective solution has been given.

[0006] Therefore, the present application is proposed by the present inventor on the basis of years of experience and practice in the relevant industry, so as to overcome the defects of the prior art. SUMMARY

[0007] The present application aims to provide a drilling stick-slip vibration control device, which can adjust the stress state of the lower drilling tool assembly and the working state of the bit in real time without affecting normal drilling operations, effectively prevent and automatically control the stick-slip vibration in the drilling process, reduce the failure risk of the downhole drilling tool assembly and the bit, and improve the service life of the bit and the drilling efficiency.

[0008] The object of the present application can be achieved by using the following technical solutions:

[0009] The application provides a drilling stick-slip vibration control device which is arranged at the bottom of a drill string and extends into a wellbore with the drill string, and comprises a mandrel, a drill bit cutting depth regulating mechanism and a rotating sub, wherein the mandrel, the drill bit cutting depth regulating mechanism and the rotating sub are all in a tubular structure with both ends being open, the drill bit cutting depth regulating mechanism is sleeved outside the mandrel, an annular first pressure regulating cavity is formed between the inner wall of the drill bit cutting depth regulating mechanism and the outer wall of the mandrel, and an elastic structural member is filled in the first pressure regulating cavity, and the top end of the rotating sub is rotatably connected with the bottom end of the mandrel, and the bottom end of the rotating sub is connected with a drilling tool.

[0010] When the drilling tool is used for drilling, the rotating sub and the mandrel can move along the axial direction of the mandrel, and the elastic structural member in the first pressure regulating cavity is in a compressed state.

[0011] In a preferred embodiment of the application, a first positioning ring is fixedly sleeved on the outer wall of the mandrel, and a first pressure regulating sliding ring is slidingly sleeved on the outer wall of the mandrel and above the first positioning ring, so as to form the first pressure regulating cavity between the outer wall of the mandrel, the inner wall of the drill bit cutting depth regulating mechanism, the first positioning ring and the first pressure regulating sliding ring, and the first pressure regulating sliding ring is connected with the elastic structural member in the first pressure regulating cavity.

[0012] In a preferred embodiment of the application, the drilling stick-slip vibration control device further comprises a limiting joint which is in a tubular structure with both ends being open, the top end of the limiting joint is connected with the bottom of the drill string, the bottom end of the limiting joint is connected with the top end of the drill bit cutting depth regulating mechanism, the top of the first pressure regulating sliding ring can abut against the bottom end of the limiting joint, the bottom end of the drill bit cutting depth regulating mechanism is provided with a first limiting boss, and the bottom of the first positioning ring can abut against the top of the first limiting boss.

[0013] In a preferred embodiment of the application, the drilling stick-slip vibration control device further comprises a limiting sub and a linkage mechanism, wherein the limiting sub and the linkage mechanism are both in a tubular structure with both ends being open, the limiting sub and the linkage mechanism are both sleeved outside the rotating sub, the bottom end of the rotating sub extends below the linkage mechanism, the top end of the limiting sub is connected with the drill bit cutting depth regulating mechanism, the bottom end of the limiting sub is connected with the top end of the linkage mechanism, and the bottom end of the linkage mechanism is rotatably connected with the rotating sub.

[0014] In a preferred embodiment of the present application, a second limiting boss is formed on the outer wall of the rotating segment, a first limiting groove for limiting upward movement of the rotating segment is formed on the inner wall of the limiting segment, a second limiting groove for limiting downward movement of the rotating segment is formed on the inner wall of the linkage mechanism, the rotating segment can move upward to a position where the top of the second limiting boss abuts against the inner wall of the top of the first limiting groove, and the rotating segment can move downward to a position where the bottom of the second limiting boss abuts against the inner wall of the bottom of the second limiting groove.

[0015] In a preferred embodiment of the present application, at least one WOB regulating segment is arranged between the drill bit cutting depth regulating mechanism and the limiting segment, the WOB regulating segment is a cylindrical structure with open ends, the WOB regulating segment is sleeved on the outer side of the mandrel, the top end of the WOB regulating segment is connected with the bottom end of the drill bit cutting depth regulating mechanism, the bottom end of the WOB regulating segment is connected with the top end of the limiting segment, an annular second pressure regulating cavity is formed between the inner wall of the WOB regulating segment and the outer wall of the mandrel, and an elastic structural member is filled in the second pressure regulating cavity, when the rotating segment and the mandrel move along the axial direction of the mandrel, the elastic structural member in the second pressure regulating cavity is in a state of being compressed.

[0016] In a preferred embodiment of the present application, a second positioning ring is fixedly sleeved on the outer wall of the mandrel, and a second pressure regulating sliding ring is slidingly sleeved on the outer wall of the mandrel below the second positioning ring, so as to form the second pressure regulating cavity between the outer wall of the mandrel, the inner wall of the WOB regulating segment, the second positioning ring and the second pressure regulating sliding ring, and the second pressure regulating sliding ring is connected with the elastic structural member in the second pressure regulating cavity.

[0017] In a preferred embodiment of the present application, the number of WOB regulating segments is multiple, and each WOB regulating segment is sequentially connected.

[0018] In a preferred embodiment of the present application, the top end of the rotating segment is connected with the bottom end of the mandrel through a sealing bearing.

[0019] In a preferred embodiment of the present application, the elastic structural member is a spring and / or an elastic medium.

[0020] The drilling stick-slip vibration control device has the following advantages: the drill bit cutting depth regulating mechanism is arranged outside the mandrel, the first pressure regulating cavity filled with the elastic structural member is formed between the drill bit cutting depth regulating mechanism and the mandrel, the rotating sub is rotatably connected to the bottom end of the mandrel and is used for being connected with the downhole drilling tool, the rotating sub can rotate with the drilling tool and does not affect the normal drilling operation when the drilling tool is used for drilling, the mandrel can move along the axial direction of the mandrel and press the elastic structural member under the pressure of the drilling tool in the drilling state, the position of the drilling tool is adjusted in a small range along the axial direction in real time, the rock breaking friction fluctuation range of the drill bit is effectively reduced, the rotation of the rotating sub does not affect the axial movement of the mandrel, the torque accumulation of the drill string is reduced, the torque of the drill string is actively released, the stress state of the drilling tool is improved, the stick-slip vibration in the drilling process is prevented and automatically controlled, the risk of downhole failure of the drilling tool is reduced, and the service life of the drill bit and the drilling efficiency are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] The following drawings are only intended to illustrate and explain the present application and do not limit the scope of the present application.

[0022] Wherein:

[0023] Figure 1 Fig. 1 is a structural schematic view of the drilling stick-slip vibration control device of the present application.

[0024] The reference numerals in the present application are as follows:

[0025] 1, limit joint; 2, drill bit cutting depth regulating mechanism;

[0026] 201, first pressure regulating cavity; 202, first limit boss;

[0027] 3, drilling pressure regulating sub; 301, second pressure regulating cavity;

[0028] 4, limit sub; 401, first limit groove;

[0029] 5, linkage mechanism; 501, second limit groove;

[0030] 502, helical structure; 6, rotating sub;

[0031] 601, second limit boss; 7, mandrel;

[0032] 701, first pressure regulating slip ring; 702, second pressure regulating slip ring;

[0033] 703, sealing bearing; 704, first positioning ring;

[0034] 705, second positioning ring. DETAILED DESCRIPTION

[0035] In order to have a clearer understanding of the technical features, objectives and effects of the present application, the specific embodiments of the present application will be described with reference to the accompanying drawings.

[0036] The words of up, down, top, bottom and the like in the present application have directional indications, which are based on the directions in the accompanying drawings. Figure 1 The words of up, down, top, bottom and the like in the present application have directional indications, which are based on the directions in the accompanying drawings.

[0037] As shown in FIG. Figure 1 The present application provides a drilling stick-slip vibration control device, which is arranged at the bottom of a drill string and extends into a wellbore with the drill string. The drilling stick-slip vibration control device comprises a mandrel 7, a drill bit cutting depth regulating mechanism 2 and a rotating sub 6. The mandrel 7, the drill bit cutting depth regulating mechanism 2 and the rotating sub 6 are all cylindrical structures arranged in the vertical direction and open at both ends. The drill bit cutting depth regulating mechanism 2 is sleeved outside the mandrel 7, and a circular annular first pressure regulating cavity 201 is formed between the inner wall of the drill bit cutting depth regulating mechanism 2 and the outer wall of the mandrel 7 in the circumferential direction of the mandrel 7. An elastic structural member is filled in the first pressure regulating cavity 201. The top end of the rotating sub 6 is rotatably connected with the bottom end of the mandrel 7, and the bottom end of the rotating sub 6 is connected with a drilling tool. When the drilling tool is performing drilling operation, the rotating sub 6 and the mandrel 7 can move in the axial direction of the mandrel 7, and the elastic structural member in the first pressure regulating cavity 201 is in a state of being extruded.

[0038] The present application has the drill bit cutting depth regulating mechanism 2 sleeved outside the mandrel 7, and a first pressure regulating cavity 201 filled with an elastic structural member is formed between the drill bit cutting depth regulating mechanism 2 and the mandrel 7. The rotating sub 6 is rotatably connected with the bottom end of the mandrel 7, and the rotating sub 6 is used to be connected with a downhole drilling tool. When the drilling tool is performing drilling operation, the rotating sub 6 can rotate synchronously with the drilling tool, and will not affect the normal drilling operation. In addition, in the drilling operation state, the mandrel 7 can move in the axial direction of the mandrel 7 due to the pressure of the drilling tool, and extrude the elastic structural member, so as to achieve the purpose of adjusting the position of the drilling tool in a small range in the axial direction in real time, effectively reduce the fluctuation amplitude of the rock breaking friction of the drill bit, and reduce the torque accumulation of the drill string, so as to achieve the effect of actively releasing the torque of the drill string, thereby improving the stress state of the drilling tool, effectively preventing and automatically controlling the stick-slip vibration in the drilling process, reducing the risk of downhole failure of the drilling tool, and improving the service life of the drill bit and the drilling efficiency.

[0039] Further, the drilling tool can be a drill bit, a rotary steering tool or a screw rod.

[0040] Further, the elastic structure in the first pressure regulating cavity 201 can be, but is not limited to, a spring and / or an elastic medium. The spring can be, but is not limited to, a disc spring or a coil spring, which is arranged in the first pressure regulating cavity 201 along the vertical direction.

[0041] In an optional embodiment of the present application, as shown in Figure 1 The outer wall of the mandrel 7 is fixedly sleeved with a first positioning ring 704, and the outer wall of the mandrel 7 is slidably sleeved with a first pressure regulating sliding ring 701. The first pressure regulating sliding ring 701 is connected with the elastic structure in the first pressure regulating cavity 201, so that the first pressure regulating sliding ring 701 can move along the axial direction of the mandrel 7 with the elastic structure in the first pressure regulating cavity 201. The first pressure regulating sliding ring 701 is located above the first positioning ring 704, so as to form the first pressure regulating cavity 201 between the outer wall of the mandrel 7, the inner wall of the drill bit cutting depth regulating mechanism 2, the top of the first positioning ring 704 and the bottom of the first pressure regulating sliding ring 701.

[0042] Further, as shown in Figure 1 The drilling stick-slip vibration control device further comprises a limiting joint 1, which is a cylindrical structure arranged along the vertical direction and having two open ends. The top end of the limiting joint 1 is connected with the bottom of the drill string, and the bottom end of the limiting joint 1 is connected with the top end of the drill bit cutting depth regulating mechanism 2. The top of the first pressure regulating sliding ring 701 can abut against the bottom end of the limiting joint 1. The inner wall of the bottom end of the drill bit cutting depth regulating mechanism 2 is formed with a first limiting boss 202 in the form of a circular ring along the circumferential direction thereof. During the process of the mandrel 7 following the rotary sub 6 moving downward, the bottom of the first positioning ring 704 abuts against the top of the first limiting boss 202, thereby limiting the downward movement of the mandrel 7. The elastic structure in the first pressure regulating cavity 201 no longer shrinks after reaching a certain compression amount. The first pressure regulating sliding ring 701 cooperates with the first positioning ring 704 to limit the elastic structure in the first pressure regulating cavity 201, so that the elastic structure can provide elastic force to the rotary sub 6, thereby ensuring the normal work of the drilling tool.

[0043] Further, the limiting joint 1 and the drill string, and the limiting joint 1 and the drill bit cutting depth regulating mechanism 2 can be connected by, but are not limited to, a threaded connection or a snap spring connection, which can ensure a stable connection relationship and facilitate disassembly and assembly.

[0044] In an optional embodiment of the present application, as shown in Figure 1As shown, the drilling stick-slip vibration control device further comprises a limiting nipple 4 and a linkage mechanism 5, both of which are cylindrical structures arranged in the vertical direction and open at both ends, and both of which are sleeved outside the rotating nipple 6. The limiting nipple 4 is located above the linkage mechanism 5, and the bottom end of the rotating nipple 6 extends below the linkage mechanism 5 through the bottom end opening of the linkage mechanism 5. The top end of the limiting nipple 4 is connected with the drill bit cutting depth control mechanism 2, and the bottom end of the limiting nipple 4 is connected with the top end of the linkage mechanism 5. The bottom end of the linkage mechanism 5 is rotatably connected with the rotating nipple 6.

[0045] Further, as shown in the figure, Figure 1 The bottom end of the linkage mechanism 5 is rotatably connected with the outer wall of the rotating nipple 6 through a spiral structure 502, so that when the rotating nipple 6 rotates, the linkage mechanism 5 and each structural member connected therewith (such as the limiting nipple 4, the drill bit cutting depth control mechanism 2, and the limiting joint 1) can also be in a rotating state, and can have different angular velocities with the rotating nipple 6.

[0046] Further, the limiting nipple 4 and the linkage mechanism 5 can be connected by thread connection or snap spring connection, but are not limited thereto, which can ensure stable connection and facilitate disassembly and assembly.

[0047] In this embodiment, as shown in the figure, Figure 1 The outer wall of the rotating nipple 6 is formed with a circular annular second limiting boss 601 along the circumferential direction thereof, the inner wall of the limiting nipple 4 is formed with a first limiting groove 401 for limiting upward movement of the rotating nipple 6 along the circumferential direction thereof, and the inner wall of the linkage mechanism 5 is formed with a second limiting groove 501 for limiting downward movement of the rotating nipple 6 along the circumferential direction thereof. When the rotating nipple 6 moves upward to the maximum position, the top of the second limiting boss 601 abuts against the top inner wall of the first limiting groove 401. When the rotating nipple 6 moves downward to the maximum position, the bottom of the second limiting boss 601 abuts against the bottom inner wall of the second limiting groove 501. Thus, by matching the first limiting groove 401 and the second limiting groove 501 with the second limiting boss 601, the axial movement range of the rotating nipple 6 is limited. The specific positions and sizes of the first limiting groove 401 and the second limiting groove 501 can be fixedly arranged or adjusted according to actual working conditions.

[0048] In an optional embodiment of the present application, as shown in the figure, Figure 1As shown, at least one drilling pressure regulating short section 3 is arranged between the drill bit cutting depth regulating mechanism 2 and the limiting short section 4, the drilling pressure regulating short section 3 is a cylindrical structure arranged along the vertical direction and having two open ends, the drilling pressure regulating short section 3 is sleeved on the outside of the mandrel 7, the top end of the drilling pressure regulating short section 3 is connected with the bottom end of the drill bit cutting depth regulating mechanism 2, the bottom end of the drilling pressure regulating short section 3 is connected with the top end of the limiting short section 4, and a second pressure regulating cavity 301 in the shape of a ring is formed between the inner wall of the drilling pressure regulating short section 3 and the outer wall of the mandrel 7, and an elastic structure is filled in the second pressure regulating cavity 301, and when the rotating short section 6 and the mandrel 7 move along the axial direction of the mandrel 7, the elastic structure in the second pressure regulating cavity 301 is in a state of being extruded. Through the second pressure regulating cavity 301 and the elastic structure filled therein, the drill bit cutting depth regulating mechanism 2 is cooperated to jointly regulate the pressure.

[0049] Further, the drill bit cutting depth regulating mechanism 2 and the drilling pressure regulating short section 3, and the drilling pressure regulating short section 3 and the limiting short section 4 can be connected by thread connection or snap spring connection, but are not limited thereto, which can ensure stable connection and facilitate disassembly and assembly.

[0050] Further, the elastic structure in the second pressure regulating cavity 301 can be a spring and / or an elastic medium, but is not limited thereto. The spring can be a disc spring or a spiral spring, but is not limited thereto, and the spring is arranged in the second pressure regulating cavity 301 along the vertical direction.

[0051] In the embodiment, as shown in Figure 1 The outer wall of the mandrel 7 is fixedly sleeved with a second positioning ring 705, and the outer wall of the mandrel 7 is slidably sleeved with a second pressure regulating sliding ring 702, the second pressure regulating sliding ring 702 is connected with the elastic structure in the second pressure regulating cavity 301, so that the second pressure regulating sliding ring 702 can move along the axial direction of the mandrel 7 with the elastic structure in the second pressure regulating cavity 301. The second pressure regulating sliding ring 702 is located below the second positioning ring 705, so as to form the second pressure regulating cavity 301 between the outer wall of the mandrel 7, the inner wall of the drilling pressure regulating short section 3, the bottom of the second positioning ring 705 and the top of the second pressure regulating sliding ring 702.

[0052] Further, the number of the drilling pressure regulating short sections 3 can be multiple, and the drilling pressure regulating short sections 3 are sequentially connected.

[0053] Further, as shown in Figure 1 The top end of the rotating short section 6 is sealingly connected with the bottom end of the mandrel 7 through a sealing bearing 703. Through the arrangement of the sealing bearing 703, the torque of the mandrel 7 will not be transmitted to the rotating short section 6, so as to reduce the torque accumulation of the drill string, achieve the effect of actively releasing the torque of the drill string, and improve the stress state of the drilling tool connected with the rotating short section 6.

[0054] The drilling stick-slip vibration control device has the following characteristics and advantages:

[0055] I. The drilling stick-slip vibration control device, the rotating nipple 6 is rotationally connected with the mandrel 7, the rotating nipple 6 can rotate synchronously with the drilling tool, at the same time, the mandrel 7 can move along the axial direction and extrude the elastic structural member due to the pressure, therefore, the position of the drilling tool can be adjusted in the axial direction in real time without affecting the normal drilling operation, the drilling tool is provided with a certain degree of freedom in the axial direction, the fluctuation range of the rock breaking friction of the drill bit is effectively reduced, the stick-slip vibration in the drilling process is prevented and automatically controlled, and the service life of the drill bit and the drilling efficiency are improved.

[0056] II. The drilling stick-slip vibration control device, the rotation of the rotating nipple 6 does not affect the axial movement of the mandrel 7, the torque accumulation of the drill string can be reduced, the effect of actively releasing the torque of the drill string is achieved, the stress state of the drilling tool is improved, the long-term and stable operation state of the drilling tool is ensured, the risk of downhole failure of the drilling tool is reduced, the service life of the drill bit and the drilling efficiency are improved.

[0057] The above description is only a specific embodiment of the present application, and is not used to limit the scope of the present application. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present application shall fall within the scope of the present application.

Claims

1. A drilling stick-slip vibration control device, which is disposed at the bottom of the drill string and extends into the wellbore along with the drill string, characterized in that, The drilling stick-slip vibration control device includes a mandrel, a drill bit cutting depth control mechanism, and a rotating sub. The mandrel, the drill bit cutting depth control mechanism, and the rotating sub are all cylindrical structures with open ends. The drill bit cutting depth control mechanism is sleeved on the outside of the mandrel, and an annular first pressure regulating cavity is formed between the inner wall of the drill bit cutting depth control mechanism and the outer wall of the mandrel. The first pressure regulating cavity is filled with an elastic structural component. The top end of the rotating sub is rotatably connected to the bottom end of the mandrel, and the bottom end of the rotating sub is connected to the drilling tool. The drilling stick-slip vibration control device also includes a limiting short section and a linkage mechanism. Both the limiting short section and the linkage mechanism are cylindrical structures with openings at both ends. Both the limiting short section and the linkage mechanism are sleeved on the outside of the rotating short section. The bottom end of the rotating short section extends to the bottom of the linkage mechanism. The top end of the limiting short section is connected to the drill bit cutting depth control mechanism. The bottom end of the limiting short section is connected to the top end of the linkage mechanism. The bottom end of the linkage mechanism is rotatably connected to the rotating short section. A second limiting protrusion is formed on the outer wall of the rotating section, a first limiting groove is formed on the inner wall of the limiting section to limit the upward movement of the rotating section, and a second limiting groove is formed on the inner wall of the linkage mechanism to limit the downward movement of the rotating section. The rotating section can move upward to a position where the top of the second limiting protrusion abuts against the top inner wall of the first limiting groove, and the rotating section can move downward to a position where the bottom of the second limiting protrusion abuts against the bottom inner wall of the second limiting groove. When the drilling tool is performing drilling operations, the rotating sub and the mandrel can move along the axial direction of the mandrel, and the elastic structural member in the first pressure regulating chamber is under compression.

2. The drilling stick-slip vibration control device as described in claim 1, characterized in that, A first positioning ring is fixedly sleeved on the outer wall of the mandrel, and a first pressure adjusting slip ring is slidably sleeved on the outer wall of the mandrel above the first positioning ring, so as to form the first pressure adjusting cavity between the outer wall of the mandrel, the inner wall of the drill bit cutting depth control mechanism, the first positioning ring and the first pressure adjusting slip ring, and the first pressure adjusting slip ring. The first pressure adjusting slip ring is connected to the elastic structural member in the first pressure adjusting cavity.

3. The drilling stick-slip vibration control device as described in claim 2, characterized in that, The drilling stick-slip vibration control device also includes a limiting joint, which is a cylindrical structure with open ends. The top end of the limiting joint is connected to the bottom of the drill string, and the bottom end of the limiting joint is connected to the top end of the drill bit cutting depth control mechanism. The top end of the first pressure regulating slip ring can abut against the bottom end of the limiting joint. A first limiting boss is formed on the inner wall of the bottom end of the drill bit cutting depth control mechanism, and the bottom end of the first positioning ring can abut against the top end of the first limiting boss.

4. The drilling stick-slip vibration control device as described in claim 1, characterized in that, At least one drill pressure regulating section is provided between the drill bit cutting depth regulating mechanism and the limiting section. The drill pressure regulating section is a cylindrical structure with open ends. The drill pressure regulating section is sleeved on the outside of the mandrel. The top end of the drill pressure regulating section is connected to the bottom end of the drill bit cutting depth regulating mechanism, and the bottom end of the drill pressure regulating section is connected to the top end of the limiting section. An annular second pressure regulating cavity is formed between the inner wall of the drill pressure regulating section and the outer wall of the mandrel. The second pressure regulating cavity is filled with an elastic structural member. When the rotating section and the mandrel move along the axial direction of the mandrel, the elastic structural member in the second pressure regulating cavity is under compression.

5. The drilling stick-slip vibration control device as described in claim 4, characterized in that, A second positioning ring is fixedly sleeved on the outer wall of the mandrel, and a second pressure regulating slip ring is slidably sleeved on the outer wall of the mandrel and below the second positioning ring, so as to form a second pressure regulating cavity between the outer wall of the mandrel, the inner wall of the drill pressure regulating sub, the second positioning ring and the second pressure regulating slip ring, and the second pressure regulating slip ring. The second pressure regulating slip ring is connected to the elastic structural member in the second pressure regulating cavity.

6. The drilling stick-slip vibration control device as described in claim 4, characterized in that, The number of drilling pressure control subs is multiple, and the drilling pressure control subs are connected in series.

7. The drilling stick-slip vibration control device as described in claim 1, characterized in that, The top end of the rotating section is connected to the bottom end of the mandrel by a sealed bearing.

8. The drilling stick-slip vibration control device as described in claim 1, characterized in that, The elastic structural component is a spring and / or an elastic medium.

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