CN210164439U

CN210164439U - Bidirectional drill string vibration absorber

Info

Publication number: CN210164439U
Application number: CN201921007351.XU
Authority: CN
Inventors: 黄保黔; 郑波强; 王文; 张盼
Original assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Current assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-03-20
Anticipated expiration: 2029-07-01

Abstract

The utility model discloses a bidirectional drill string vibration absorber, which comprises an outer cylinder component and a mandrel component arranged in the outer cylinder component, wherein the outer cylinder component is formed by connecting an upper joint, an outer cylinder and a spline sleeve together in a threaded manner from top to bottom in sequence, and a piston is embedded in the inner wall of the spline sleeve; the mandrel assembly is formed by sequentially connecting a mandrel joint, an extension mandrel and a mandrel through threads from top to bottom, and the spline grooves in the inner wall of the spline sleeve are in clearance fit with the splines in the outer wall of the mandrel. The utility model discloses a drilling mud is used in suspension section, mechanical damping component and hydraulic pressure damping component common action lifting, pushing down the section of damping, realizes no matter lifting or pushing down, and good damping effect can both be realized to two-way drilling string damper, guarantees that whole drilling string system is being crept into the vibration of in-process upper portion and lower part and is keeping apart completely, eliminates the influence that fatigue failure brought under the alternating stress effect, reaches the purpose that reduces the drilling accident.

Description

Bidirectional drill string vibration absorber

Technical Field

The utility model relates to a two-way drilling string vibration absorber belongs to drilling tool technical field.

Background

In the process of drilling for petroleum, natural gas and geological exploration, a drill bit needs to make downward cutting movement in order to reach a preset drilling depth. In the drilling process, due to the change of factors such as a drill bit structure, a geological structure, drilling conditions and the like, the reaction force at the bottom of a well is changed continuously, so that all elements in the whole drill string system continuously bear alternating load, and alternating stress exists in a drill rod, a drill collar, a drilling-while instrument and a drilling-while tool under the action of the alternating load. And the drill pipe, the drill collar, the while-drilling instrument and the while-drilling tool are under alternating stress for a long time, fatigue failure can occur, the service life is shortened, the condition is serious, even fracture is caused, and underground accidents occur.

In the existing drilling process, a damping device is generally connected to the upper part of a drill bit so as to reduce the harm of alternating reaction force to a drill string in the drilling process. However, the damping device can only eliminate a large peak value in the vibration, and cannot eliminate the influence caused by the vibration. However, fatigue fracture by such small vibration has become one of the main causes of drilling accidents. In recent years, as shale gas is continuously developed in China, drilling conditions are worse, and the frequency of drilling tool fracture accidents is continuously increased. And the drilling process is stopped, so that the fishing operation can greatly reduce the working efficiency and increase the drilling cost.

With the continuous development of the drilling process, the lifting type drilling is also in continuous use, so that a tool capable of eliminating vibration under the lifting state is needed, and the product is not available at home at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure, safe and reliable's two-way drilling string vibration absorber to guarantee that whole drilling string system is being crept into the vibration of in-process upper portion and lower part and keep apart completely, eliminate the influence that fatigue failure brought under the alternating stress effect, reach the purpose that reduces the drilling accident.

The technical scheme of the utility model: a bidirectional drill string vibration absorber comprises an outer barrel assembly and a mandrel assembly arranged in the outer barrel assembly, wherein the outer barrel assembly is formed by connecting an upper connector, an outer barrel and a spline sleeve together in a threaded manner from top to bottom in sequence, and a piston is embedded in the inner wall of the spline sleeve; the mandrel assembly is formed by sequentially connecting a mandrel joint, an extension mandrel and a mandrel thread together from top to bottom, and a spline groove on the inner wall of the spline sleeve is in clearance fit with a spline on the outer wall of the mandrel; an upper cavity and a lower cavity are reserved between the inner wall of the outer barrel and the outer wall of the extension mandrel respectively, a piston body and a mechanical damping element are sequentially arranged in the upper cavity from top to bottom, pistons are embedded in the inner wall and the outer wall of the piston body, a hydraulic damping element is filled in the lower cavity, and the upper cavity and the lower cavity are communicated with each other through a pipe wall gap.

Further, the lower end of the mandrel extends out of the lower end of the spline sleeve, and a lower connecting external thread is arranged at the lower end of the mandrel.

Furthermore, an upper connecting internal thread is arranged on the upper joint.

Further, the mechanical damping element is a spring assembly, and the hydraulic damping element is a liquid spring.

Due to the adoption of the technical scheme, the utility model has the advantages of: the utility model discloses a drilling mud is used in suspension section, mechanical damping component and hydraulic pressure damping component common action lifting, pushing down the section of damping, realizes no matter lifting or pushing down, and good damping effect can both be realized to two-way drilling string damper, guarantees that whole drilling string system is being crept into the vibration of in-process upper portion and lower part and is keeping apart completely, eliminates the influence that fatigue failure brought under the alternating stress effect, reaches the purpose that reduces the drilling accident.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

fig. 3 is an enlarged view B of fig. 1:

fig. 4 is a schematic view of the suspension section of the present invention;

FIG. 5 is a schematic view of the lift-up vibration-damping section of the present invention;

fig. 6 is a schematic view of the vibration damping section of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

The embodiment of the utility model provides a: the bidirectional drill string vibration absorber comprises an outer cylinder assembly and a mandrel assembly arranged in the outer cylinder assembly, wherein the outer cylinder assembly is formed by connecting an upper connector 1, an outer cylinder 2 and a spline sleeve 3 together in a threaded manner from top to bottom in sequence, and a piston 12 is embedded in the inner wall of the spline sleeve 3; the mandrel assembly is formed by sequentially connecting a mandrel joint 4, an extension mandrel 5 and a mandrel 6 together through threads from top to bottom, and a spline groove on the inner wall of the spline sleeve 3 is in clearance fit with a spline on the outer wall of the mandrel 6; an upper cavity and a lower cavity are reserved between the inner wall of the outer barrel 2 and the outer wall of the extension mandrel 5 respectively, a piston body 7 and a mechanical damping element 8 are sequentially arranged in the upper cavity from top to bottom, pistons 12 are embedded in the inner wall and the outer wall of the piston body 7, a hydraulic damping element 9 is filled in the lower cavity, and the upper cavity and the lower cavity are communicated with each other through a pipe wall gap. The lower end of the mandrel 6 extends out of the lower end of the spline sleeve 3, and the lower end of the mandrel 6 is provided with a lower connecting external thread 10 for connecting a lower drilling tool; the upper connector 1 is provided with an upper connecting internal thread 11 for connecting an upper drilling tool. The mechanical damping element 8 is a spring assembly, and the hydraulic damping element 9 is a liquid spring.

The utility model discloses a theory of operation:

as shown in fig. 1, the torque of the drill string vibration absorber of the present invention is transmitted sequentially through the following components:

the upper drill, the upper joint 1, the outer cylinder 2, the spline sleeve 3, the mandrel 6 and the lower drill.

As shown in fig. 4, the present invention is in a free state, that is, the lower end of the mandrel joint 4 and the upper end of the piston body 7 are reserved with a suspension stroke, the drill string vibration absorber acts on the acting area of the drilling mud through the internal pressure of the drilling mud in the stroke to form a liquid spring for eliminating vibration, and in the free stroke suspension stroke, the smallest vibration can be eliminated, and the vibration is realized by the circulating pressure buffering of the drilling mud.

As shown in fig. 5, when the drilling tool is lifted up, the lower end of the mandrel joint 4 contacts with the upper end of the piston body 7, the drill string vibration absorber is in the stroke, the outer cylinder 2, the spline sleeve 3, the mandrel 6, the extension mandrel 5, the piston body 7 and the sealing element form a closed space, and at the moment, the piston 12 on the outer wall of the piston body 7 and the piston 12 on the inner wall of the spline sleeve 3 act together to force the volume change of the liquid spring to enable the hydraulic damping element 9 to work; simultaneously, the mechanical damping element 8 works through the change of the stroke; the combined action of the two vibration reduction elements is combined to achieve the purpose of eliminating vibration in the lifting process.

As shown in fig. 6, when the drill string shock absorber is pressed down, the outer cylinder 2, the spline sleeve 3, the mandrel 6, the extension mandrel 5, the piston body 7 and the sealing element thereof form a closed space in the stroke, and at the moment, the piston 12 on the inner wall of the piston body 7 and the piston 12 on the inner wall of the spline sleeve 3 are acted together to force the volume change of the liquid spring, so that the hydraulic shock absorption element 9 works; simultaneously, the mechanical damping element 8 works through the change of the stroke; the combined action of the two vibration reduction elements is combined to achieve the purpose of eliminating vibration in the pressing process.

Claims

1. A bi-directional drill string vibration suppressor comprising an outer barrel assembly and a mandrel assembly disposed within the outer barrel assembly, characterized in that: the outer barrel assembly is formed by sequentially connecting an upper joint (1), an outer barrel (2) and a spline sleeve (3) together through threads from top to bottom, and a piston (12) is embedded in the inner wall of the spline sleeve (3); the mandrel assembly is formed by sequentially connecting a mandrel joint (4), an extension mandrel (5) and a mandrel (6) together through threads from top to bottom, and spline grooves in the inner wall of the spline sleeve (3) are in clearance fit with splines on the outer wall of the mandrel (6); an upper cavity and a lower cavity are reserved between the inner wall of the outer barrel (2) and the outer wall of the extension mandrel (5) respectively, a piston body (7) and a mechanical damping element (8) are sequentially arranged in the upper cavity from top to bottom, pistons (12) are embedded in the inner wall and the outer wall of the piston body (7), a hydraulic damping element (9) is filled in the lower cavity, and the upper cavity and the lower cavity are communicated with each other through a pipe wall gap.

2. The bi-directional drill string absorber of claim 1, wherein: the lower end of the mandrel (6) extends out of the lower end of the spline sleeve (3), and a lower connecting external thread (10) is arranged at the lower end of the mandrel (6).

3. The bi-directional drill string absorber of claim 1, wherein: the upper joint (1) is provided with an upper connecting internal thread (11).

4. The bi-directional drill string absorber of claim 1, wherein: the mechanical damping element (8) is a spring assembly, and the hydraulic damping element (9) is a liquid spring.