CN115182687A - Underground vibration damper for oil and gas drilling - Google Patents
Underground vibration damper for oil and gas drilling Download PDFInfo
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- CN115182687A CN115182687A CN202210852306.4A CN202210852306A CN115182687A CN 115182687 A CN115182687 A CN 115182687A CN 202210852306 A CN202210852306 A CN 202210852306A CN 115182687 A CN115182687 A CN 115182687A
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- mandrel
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- joint
- step shaft
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/07—Telescoping joints for varying drill string lengths; Shock absorbers
- E21B17/076—Telescoping joints for varying drill string lengths; Shock absorbers between rod or pipe and drill bit
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses an underground vibration damper for oil gas drilling, which comprises an upper joint, a mandrel, a middle outer cylinder, a step shaft and a lower joint, wherein the upper joint, the mandrel and the middle outer cylinder are connected through threads; in the vibration process of the drill column, double vibration reduction can be realized through the main spring and the silicone oil; the bit pressure transmitted by the upper drill string acts on the lower joint through the lower end face of the mandrel, and the torque is transmitted through the matching of the convex key of the mandrel and the spline groove of the lower joint.
Description
Technical Field
The invention relates to a vibration damper, in particular to an underground vibration damper for oil and gas drilling, belonging to the technical field of mechanical engineering or drilling engineering.
Background
Oil and gas resources are typically located hundreds to thousands of meters below the surface. During oil and gas drilling, a hollow drill string is used to transmit weight and torque on bit and to provide a circulation path for the drilling fluid. However, drill string vibration frequently occurs due to the large aspect ratio characteristics of the drill string used to drill the well, coupled with the non-uniform nature of the formation being drilled by the drill bit. As the depth of the well increases, the drill string stiffness decreases and the drill string vibrates more severely. Thus, the provision of a vibration damping device in the drill string helps to concentrate the energy of the drill string on breaking rock, while also reducing the incidence of drill string failure.
The vibration of the drill string includes a variety of forms, and its vibration characteristics are also related to the well bore configuration, drill string configuration, formation characteristics, drill bit parameters, drilling parameters, and drilling fluid parameters, among others. The existing underground vibration damper can not adjust the vibration characteristic of a drill stem according to the structure of the drill stem or the flow of drilling fluid. Therefore, the underground vibration damping device with different structures needs to be designed on the basis of the prior art, and the vibration of the drill string is slowed down or inhibited.
Disclosure of Invention
The invention aims to: a downhole vibration damping device for oil and gas drilling is provided for damping or controlling axial vibration of a drill string, thereby utilizing drill string energy for breaking rock to improve drilling efficiency and reduce drill string failure events.
The technical scheme adopted by the invention is as follows:
an underground vibration damping device for oil and gas drilling comprises an upper joint, a mandrel, a middle outer cylinder, a step shaft and a lower joint, wherein a slide valve mounting hole, a one-way valve mounting hole, a throttle valve mounting hole, an upper joint upper thread, an upper joint lower thread and an upper joint inner thread are arranged on the upper joint; the step shaft comprises a step shaft small-diameter section, a step shaft large-diameter section and a sealing groove, a limiting step is formed at the joint of the step shaft small-diameter section and the step shaft large-diameter section, the limiting step limits the displacement of the lower end face of the middle outer barrel, the step shaft small-diameter section is inserted into the middle outer barrel, the outer surface of the step shaft small-diameter section is in micro-clearance fit with the inner surface of the middle outer barrel, a sealing ring is arranged between the outer surface of the step shaft small-diameter section and the inner surface of the middle outer barrel, and the sealing groove is internally provided with the sealing ring; the lower joint is connected with the step shaft through threads, a spline groove and a lower joint inner step are arranged in the lower joint, and the lower joint inner step is used for limiting the axial displacement of the mandrel; the mandrel is positioned in the upper joint, the middle outer cylinder, the step shaft and the lower joint, a mandrel radial hole, a convex key and a mandrel hollow flow passage are formed in the mandrel, and the convex key is arranged in the spline groove; the slide valve mounting hole is aligned with the mandrel radial hole, the slide valve is mounted in the slide valve mounting hole and the mandrel radial hole, a throttle valve is arranged in the throttle valve mounting hole, a check valve is arranged in the check valve mounting hole, and the check valve is mounted in the check valve mounting hole through threaded connection.
The slide valve comprises a slide valve main body, a hollow slide valve cap, a thrust spring, a slide valve piston and a slide valve main body radial hole, wherein the slide valve main body and the hollow slide valve cap are connected through threads, and the thrust spring and the slide valve piston are arranged in the slide valve main body and the hollow slide valve cap; the slide valve main body is arranged in the slide valve mounting hole through threads, and the hollow slide valve cap is arranged in the radial hole of the mandrel; drilling fluid in the mandrel can push a sliding valve piston to move through a hollow sliding valve cap, and the thrust spring is in a compressed state; the spool body radial bore is aligned with the spool communication bore.
The upper joint further comprises an oil filling hole, a sliding valve communicating hole and an upper silicon oil cavity, an oil filling plug is arranged in the oil filling hole, the axes of the sliding valve communicating hole, the one-way valve mounting hole and the throttle valve mounting hole are parallel to the axis of the upper joint, and silicon oil can be injected into the upper silicon oil cavity through the oil filling hole.
A main spring is arranged between the lower end face of the upper joint and the upper end face of the step shaft; and a lower silicone oil cavity is formed among the lower end surface of the upper joint, the upper end surface of the step shaft, the outer wall of the mandrel and the inner wall of the middle outer barrel, and the lower silicone oil cavity is communicated with the upper silicone oil cavity through the slide valve communicating hole, the one-way valve mounting hole and the throttle valve mounting hole.
And a damping hole is arranged in the throttling valve and is a small-diameter through hole.
Further, the number of the check valves is two.
Furthermore, the check valve includes check valve body, check valve spring and check valve steel ball, the check valve body passes through the screw thread and installs in the check valve mounting hole, and the tip of check valve body is equipped with middle through-hole, the check valve spring is installed in the check valve body and its both ends interact with check valve body and check valve steel ball respectively, the flow channel that leads to last silicon oil pocket by lower silicon oil pocket in with the check valve mounting hole is stopped up to the check valve steel ball, and silicon oil in the last silicon oil pocket then the accessible promotes the check valve steel ball and compresses the check valve spring and flow into lower silicon oil pocket.
A method for an underground vibration damper of oil and gas drilling comprises the steps of inserting a mandrel into a lower joint, installing a convex key of the mandrel in a spline groove, and connecting a step shaft with the lower joint through threads; installing a throttle valve in a throttle valve installation hole, installing a one-way valve in a one-way valve installation hole, connecting the middle outer cylinder to the lower end of the upper joint, and connecting the upper joint with the mandrel in an upward pulling manner after a main spring is placed on the upper end surface of the step shaft; the upper drill string is connected with the upper joint, the torque transmitted by the upper drill string is transmitted to the mandrel through the upper joint, and the convex key of the mandrel transmits the torque to the lower joint and continues to the drill string or the drill bit connected with the lower joint; the bit pressure applied by the upper drill string acts on the upper joint, and the lower end surface of the mandrel acts on the inner step of the lower joint under the action of pressure and is transmitted to a lower drilling tool or a drill bit; in the drilling process of the drill bit, axial vibration exists in the drill string, the upper joint and the mandrel axially move relative to the lower joint and the step shaft, and a main spring arranged between the lower end face of the upper joint and the upper end face of the step shaft can be used for reducing the vibration; silicone oil is injected into the upper silicone oil cavity, the silicone oil can flow into the lower silicone oil cavity through the sliding valve communicating hole, the one-way valve and the throttle valve, and the silicone oil in the lower silicone oil cavity cannot flow into the upper silicone oil cavity through the one-way valve; the opening and closing of the slide valve communicating hole are controlled by the slide valve, when the flow of drilling fluid circulating in a drill string is changed, the pressure of the drilling fluid in the mandrel is also changed, the drilling fluid pushes the slide valve piston to move and compresses the thrust spring, so that the radial hole of the slide valve main body is communicated with the slide valve communicating hole, and the area of a fluid passage between the upper silicon oil cavity and the lower silicon oil cavity is adjusted; when the flow of the drilling fluid changes, the vibration characteristic of the drill string changes, the flow of the silicon oil is adjusted by controlling the movement of the piston of the slide valve, and the movement of the upper joint relative to the step shaft can be controlled due to the good compression performance of the silicon oil.
Furthermore, in the lifting process of the drill string, the mandrel moves upwards relative to the axial direction of the step, and the upper end of the convex key on the mandrel interacts with the end face inside the step shaft, so that the lower drilling tool is prevented from falling.
Compared with the prior art, the invention has the following beneficial effects: (1) The upper silicon oil cavity and the lower silicon oil cavity are internally provided with silicon oil, the compression performance is good, and the flow characteristic of the silicon oil between the upper silicon oil cavity and the lower silicon oil cavity can be adjusted according to the flow of the drilling fluid through the arrangement of the slide valve, so that the vibration of the drill string is reduced; (2) The device can realize the double damping function of the spring and the silicone oil.
Drawings
FIG. 1 is a schematic structural diagram of a downhole vibration damping device for oil and gas drilling according to the present invention;
FIG. 2 isbase:Sub>A schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic sectional view taken along line B-B in FIG. 1;
FIG. 4 is a schematic cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is a schematic cross-sectional view taken along line D-D of FIG. 1;
FIG. 6 is an enlarged partial view of region I of FIG. 1;
FIG. 7 is a schematic structural diagram of an upper joint in a downhole vibration damping device for oil and gas drilling according to the present invention;
FIG. 8 is another schematic view of the upper sub of the vibration damping device for oil and gas drilling according to the present invention;
FIG. 9 is another schematic view of the upper sub of the vibration damping device for oil and gas drilling according to the present invention;
FIG. 10 is another schematic view of the upper sub of the vibration damping device for oil and gas drilling according to the present invention;
FIG. 11 is a schematic view of a mandrel in a downhole vibration damping device for oil and gas drilling according to the present invention;
FIG. 12 is a schematic view of a throttle valve in a downhole vibration damping device for oil and gas drilling according to the present invention;
FIG. 13 is a schematic view of a step shaft of the downhole vibration damping device for oil and gas drilling according to the present invention;
FIG. 14 is a schematic view of a lower sub of the downhole vibration damping device for oil and gas drilling according to the present invention;
FIG. 15 is a schematic view of a check valve in the downhole vibration damping device for oil and gas drilling according to the present invention;
in the figure: 1-upper joint, 1 a-oil filling hole, 1 b-sliding valve mounting hole, 1 c-sliding valve communicating hole, 1 d-check valve mounting hole, 1 e-throttling valve mounting hole, 1 f-upper joint lower thread, 1 g-upper joint upper thread, 1 h-upper joint internal thread, 1 i-upper silicone cavity, 2-mandrel, 2 a-mandrel radial hole, 2 b-convex key, 2 c-mandrel hollow flow channel, 3-oil filling plug, 4-sliding valve, 4 a-sliding valve main body, 4 b-hollow sliding valve cap, 4 c-thrust spring, 4 d-sliding valve piston, 4 e-sliding valve main body radial hole, 5-throttling valve, 5 a-damping hole, 6-middle outer cylinder, 7-main spring, 8-sealing ring, 9-step shaft, 9 a-step shaft small diameter section, 9 b-step shaft large diameter section, 9 c-limiting step, 9 d-sealing groove, 10-lower joint, 10 a-spline groove, 10 b-lower joint inner oil cavity, 11 a-step shaft inner diameter section, 11 b-step shaft, 11 b-check valve body, 11 c-check valve body, 11 b-steel ball lower spring, and 11 c-check valve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The embodiment is as follows:
as shown in fig. 1-15, an underground vibration damping device for oil and gas drilling comprises an upper joint 1, a mandrel 2, a middle outer cylinder 6, a step shaft 9 and a lower joint 10, and is characterized in that a slide valve mounting hole 1b, a one-way valve mounting hole 1d, a throttle valve mounting hole 1e, an upper joint upper thread 1g, an upper joint lower thread 1f and an upper joint inner thread 1h are arranged on the upper joint 1, the upper joint upper thread 1g is connected with an upper pipe column, the upper joint lower thread 1f is connected with the middle outer cylinder 6, and the upper joint inner thread 1h is connected with the mandrel 2; the step shaft 9 comprises a step shaft small-diameter section 9a, a step shaft large-diameter section 9b and a sealing groove 9d, a limiting step 9c is formed at the joint of the step shaft small-diameter section 9a and the step shaft large-diameter section 9b, the limiting step 9c limits displacement of the lower end face of the middle outer cylinder 6, the step shaft small-diameter section 9a is inserted into the middle outer cylinder 6, the outer surface of the step shaft small-diameter section 9a is in micro-clearance fit with the inner surface of the middle outer cylinder 6, a sealing ring 8 is arranged between the outer surface of the step shaft small-diameter section 9a and the inner surface of the middle outer cylinder 6, and the sealing ring 8 is arranged in the sealing groove 9 d; the lower joint 10 is in threaded connection with the step shaft 9, a spline groove 10a and a lower joint inner step 10b are arranged in the lower joint 10, and the lower joint inner step 10b is used for limiting the axial displacement of the mandrel 2; the mandrel 2 is positioned in the upper joint 1, the middle outer cylinder 6, the step shaft 9 and the lower joint 10, a mandrel radial hole 2a, a convex key 2b and a mandrel hollow flow channel 2c are arranged on the mandrel 2, and the convex key 2b is arranged in a spline groove 10 a; the slide valve mounting hole 1b is aligned with the mandrel radial hole 2a, the slide valve 4 is mounted in the slide valve mounting hole 1b and the mandrel radial hole 2a, a throttle valve 5 is arranged in the throttle valve mounting hole 1e, a check valve 11 is arranged in the check valve mounting hole 1d, and the check valve 11 is mounted in the check valve mounting hole 1d through threaded connection.
The slide valve 4 comprises a slide valve main body 4a, a hollow slide valve cap 4b, a thrust spring 4c, a slide valve piston 4d and a slide valve main body radial hole 4e, the slide valve main body 4a and the hollow slide valve cap 4b are connected through threads, and the thrust spring 4c and the slide valve piston 4d are arranged in the slide valve main body 4a and the hollow slide valve cap 4 b; the slide valve main body 4a is installed in the slide valve installation hole 1b through threads, and the hollow slide valve cap 4b is installed in the mandrel radial hole 2 a; drilling fluid in the mandrel 2 can push a sliding valve piston 4d to move through a hollow sliding valve cap 4b, and the thrust spring 4c is in a compressed state; the spool body radial hole 4e is aligned with the spool communication hole 1 c.
The upper joint 1 further comprises an oil filling hole 1a, a sliding valve communicating hole 1c and an upper silicon oil cavity 1i, an oil filling plug 3 is arranged in the oil filling hole 1a, the axes of the sliding valve communicating hole 1c, the one-way valve mounting hole 1d and the throttle valve mounting hole 1e are parallel to the axis of the upper joint, and silicon oil can be injected into the upper silicon oil cavity 1i through the oil filling hole 1 a.
A main spring 7 is arranged between the lower end face of the upper joint 1 and the upper end face of the step shaft 9; a lower silicon oil cavity 12 is formed among the lower end face of the upper joint 1, the upper end face of the step shaft 9, the outer wall of the mandrel 2 and the inner wall of the middle outer cylinder 6, and the lower silicon oil cavity 12 is communicated with the upper silicon oil cavity 1i through a sliding valve communicating hole 1c, a one-way valve mounting hole 1d and a throttle valve mounting hole 1 e.
And a damping hole 5a is arranged in the throttle valve 5, and the damping hole 5a is a small-diameter through hole.
Further, the number of the check valves 11 is two.
Further, the check valve 11 includes a check valve body 11a, a check valve spring 11b and a check valve steel ball 11c, the check valve body 11a is installed in the check valve installation hole 1d through threads, a middle through hole is formed in the end portion of the check valve body 11a, the check valve spring 11b is installed in the check valve body 11a, two ends of the check valve spring 11b interact with the check valve body 11a and the check valve steel ball 11c respectively, the check valve steel ball 11c blocks a flow channel in the check valve installation hole 1f, which leads to the upper silicon oil cavity 1i from the lower silicon oil cavity 12, and silicon oil in the upper silicon oil cavity 1i can flow into the lower silicon oil cavity 12 by pushing the check valve steel ball 11c and compressing the check valve spring 11 c.
A method for the DH damping device of the oil gas well drilling, insert the dabber 2 in the lower coupling 10, make the convex key 2b of the dabber 2 mount in the spline groove 10a, connect the step shaft 9 with the lower coupling 10 through the whorl; installing a throttle valve 5 in a throttle valve installation hole 1e, installing a one-way valve 11 in a one-way valve installation hole 1d, connecting a middle outer cylinder 6 to the lower end of an upper joint 1, and connecting the upper joint 1 with the mandrel 2 in an upward pulling manner after a main spring 7 is placed on the upper end surface of a step shaft 9; the upper drill string is connected with an upper connector 1, the torque transmitted by the upper drill string is transmitted to a mandrel 2 from the upper connector 1, and a convex key 2b of the mandrel 2 transmits the torque to a lower connector 10 and continues to be transmitted to a drill string or a drill bit connected with the lower connector 10; the bit pressure applied by the upper drill string acts on the upper joint 1, and the lower end surface of the mandrel 2 acts on the inner step 10b of the lower joint under the action of pressure and is transmitted to a lower drilling tool or a drill bit; during the drilling process of the drill bit, axial vibration exists in the drill string, the upper connector 1 and the mandrel 2 axially move relative to the lower connector 10 and the step shaft 9, and the main spring 7 arranged between the lower end face of the upper connector 1 and the upper end face of the step shaft 9 can be used for damping the vibration; silicone oil is injected into the upper silicone oil cavity 1i, the silicone oil can flow into the lower silicone oil cavity 12 through the sliding valve communicating hole 1c, the one-way valve 11 and the throttle valve 5, and the silicone oil in the lower silicone oil cavity 12 cannot flow into the upper silicone oil cavity 1i through the one-way valve 11; the opening and closing of the slide valve communicating hole 1c are controlled by a slide valve 4, when the flow of drilling fluid circulating in a drill string is changed, the pressure of the drilling fluid in the mandrel 2 is changed, the drilling fluid pushes a slide valve piston 4d to move and compress a thrust spring 4c, so that a slide valve main body radial hole 4e is communicated with the slide valve communicating hole 1c, and the fluid passage area between the upper silicon oil cavity 1i and the lower silicon oil cavity 12 is adjusted; when the flow of the drilling fluid changes, the vibration characteristic of the drill string changes, the flow of the silicon oil is adjusted by controlling the movement of the slide valve piston 4d, and the movement of the upper joint 1 relative to the step shaft 9 can be controlled due to good compression performance of the silicon oil.
Further, during the lifting of the drill string, the mandrel 2 moves upward relative to the step shaft 9, and the upper end of the convex key 2b on the mandrel 2 interacts with the end surface inside the step shaft 9, thereby preventing the lower drill from falling.
The above-described embodiments are intended to illustrate rather than limit the scope of the invention, and all equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention are intended to be included within the scope of the present system.
Claims (6)
1. An underground vibration damping device for oil and gas drilling comprises an upper joint (1), a mandrel (2), a middle outer cylinder (6), a step shaft (9) and a lower joint (10), and is characterized in that a slide valve mounting hole (1 b), a one-way valve mounting hole (1 d), a throttle valve mounting hole (1 e), an upper joint upper thread (1 g), an upper joint lower thread (1 f) and an upper joint inner thread (1 h) are arranged on the upper joint (1), the upper joint upper thread (1 g) is connected with an upper pipe column, the upper joint lower thread (1 f) is connected with the middle outer cylinder (6), and the upper joint inner thread (1 h) is connected with the mandrel (2); the step shaft (9) comprises a step shaft small-diameter section (9 a), a step shaft large-diameter section (9 b) and a sealing groove (9 d), a limiting step (9 c) is formed at the joint of the step shaft small-diameter section (9 a) and the step shaft large-diameter section (9 b), the limiting step (9 c) limits the displacement of the lower end face of the middle outer cylinder (6), the step shaft small-diameter section (9 a) is inserted into the middle outer cylinder (6), the outer surface of the step shaft small-diameter section (9 a) is in micro-clearance fit with the inner surface of the middle outer cylinder (6), a sealing ring (8) is arranged between the outer surface of the step shaft small-diameter section (9 a) and the inner surface of the middle outer cylinder (6), and a sealing ring (8) is arranged in the sealing groove (9 d); the lower joint (10) is in threaded connection with the step shaft (9), a spline groove (10 a) and a lower joint inner step (10 b) are arranged in the lower joint (10), and the lower joint inner step (10 b) is used for limiting the axial displacement of the mandrel (2); the mandrel (2) is positioned in the upper joint (1), the middle outer cylinder (6), the step shaft (9) and the lower joint (10), a mandrel radial hole (2 a), a convex key (2 b) and a mandrel hollow flow channel (2 c) are formed in the mandrel (2), and the convex key (2 b) is installed in the spline groove (10 a); the slide valve installing hole (1 b) is aligned with the mandrel radial hole (2 a), a slide valve (4) is installed in the slide valve installing hole (1 b) and the mandrel radial hole (2 a), a throttle valve (5) is arranged in the throttle valve installing hole (1 e), a check valve (11) is arranged in the check valve installing hole (1 d), and the check valve (11) is installed in the check valve installing hole (1 d) through threaded connection.
2. A downhole vibration damping device for oil and gas drilling according to claim 1, wherein the spool valve (4) comprises a spool valve body (4 a), a hollow spool valve cap (4 b), a thrust spring (4 c), a spool valve piston (4 d) and a spool valve body radial hole (4 e), the spool valve body (4 a) and the hollow spool valve cap (4 b) are connected by screw threads, and the thrust spring (4 c) and the spool valve piston (4 d) are arranged in the spool valve body (4 a) and the hollow spool valve cap (4 b); the slide valve main body (4 a) is installed in the slide valve installation hole (1 b) through threads, and the hollow slide valve cap (4 b) is installed in the mandrel radial hole (2 a); drilling fluid in the mandrel (2) can push a sliding valve piston (4 d) to move through a hollow sliding valve cap (4 b), and the thrust spring (4 c) is in a compressed state; the spool body radial hole (4 e) is aligned with the spool communication hole (1 c).
3. The underground vibration damping device for oil and gas drilling is characterized in that the upper joint (1) further comprises an oil filling hole (1 a), a sliding valve communication hole (1 c) and an upper silicon oil cavity (1 i), an oil filling plug (3) is arranged in the oil filling hole (1 a), the axes of the sliding valve communication hole (1 c), a one-way valve mounting hole (1 d) and a throttle valve mounting hole (1 e) are parallel to the axis of the upper joint, and silicon oil can be injected into the upper silicon oil cavity (1 i) through the oil filling hole (1 a).
4. A downhole vibration damping device for oil and gas drilling according to claim 1, wherein a main spring (7) is arranged between the lower end surface of the upper joint (1) and the upper end surface of the stepped shaft (9); a lower silicon oil cavity (12) is formed among the lower end face of the upper joint (1), the upper end face of the step shaft (9), the outer wall of the mandrel (2) and the inner wall of the middle outer barrel (6), and the lower silicon oil cavity (12) is communicated with the upper silicon oil cavity (1 i) through a sliding valve communicating hole (1 c), a one-way valve mounting hole (1 d) and a throttle valve mounting hole (1 e).
5. A downhole vibration damping device for oil and gas drilling according to claim 1, wherein a damping hole (5 a) is provided in the choke valve (5), the damping hole (5 a) being a small diameter through hole.
6. A method of downhole vibration damping device for oil and gas drilling according to claim 1, characterized by inserting the mandrel (2) into the lower sub (10), fitting the male key (2 b) of the mandrel (2) into the splined groove (10 a), connecting the step shaft (9) with the lower sub (10) by means of a thread; installing a throttle valve (5) in a throttle valve installation hole (1 e), installing a one-way valve (11) in a one-way valve installation hole (1 d), connecting a middle outer cylinder (6) to the lower end of an upper joint (1), and connecting the upper joint (1) and a mandrel (2) in an upward pulling manner after a main spring (7) is placed on the upper end surface of a step shaft (9); the upper drill string is connected with the upper connector (1), the torque transmitted by the upper drill string is transmitted to the mandrel (2) through the upper connector (1), and the convex key (2 b) of the mandrel (2) transmits the torque to the lower connector (10) and continues to be transmitted to the drill string or the drill bit connected with the lower connector (10); the bit pressure applied by the upper drill string acts on the upper joint (1), and the lower end face of the mandrel (2) acts on the inner step (10 b) of the lower joint under the action of pressure and is transmitted to a lower drilling tool or a drill bit; in the drilling process of the drill bit, axial vibration exists in the drill string, the upper joint (1) and the mandrel (2) axially move relative to the lower joint (10) and the step shaft (9), and a main spring (7) arranged between the lower end face of the upper joint (1) and the upper end face of the step shaft (9) can be used for reducing the vibration; silicone oil is injected into the upper silicone oil cavity (1 i), the silicone oil can flow into the lower silicone oil cavity (12) through the sliding valve communicating hole (1 c), the one-way valve (11) and the throttle valve (5), and the silicone oil in the lower silicone oil cavity (12) cannot flow into the upper silicone oil cavity (1 i) through the one-way valve (11); the opening and closing of the slide valve communication hole (1 c) are controlled by a slide valve (4), when the flow of drilling fluid circulating in a drill string is changed, the pressure of the drilling fluid in the mandrel (2) is also changed, the drilling fluid pushes a slide valve piston (4 d) to move and compress a thrust spring (4 c), so that a slide valve main body radial hole (4 e) is communicated with the slide valve communication hole (1 c), and the fluid passage area between an upper silicon oil cavity (1 i) and a lower silicon oil cavity (12) is adjusted; when the flow of the drilling fluid is changed, the vibration characteristic of the drill string is changed, the flow of the silicon oil is adjusted by controlling the movement of the slide valve piston (4 d), and the movement of the upper joint (1) relative to the step shaft (9) can be controlled due to the good compression performance of the silicon oil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852306.4A CN115182687A (en) | 2022-07-20 | 2022-07-20 | Underground vibration damper for oil and gas drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210852306.4A CN115182687A (en) | 2022-07-20 | 2022-07-20 | Underground vibration damper for oil and gas drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115182687A true CN115182687A (en) | 2022-10-14 |
Family
ID=83519664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210852306.4A Pending CN115182687A (en) | 2022-07-20 | 2022-07-20 | Underground vibration damper for oil and gas drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115182687A (en) |
-
2022
- 2022-07-20 CN CN202210852306.4A patent/CN115182687A/en active Pending
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