CN208473732U

CN208473732U - A kind of structure for preventing damper screw thread to be buckled to

Info

Publication number: CN208473732U
Application number: CN201820993382.6U
Authority: CN
Inventors: 黄保黔; 王文; 万文财; 金锋
Original assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Current assignee: Guizhou Gaofeng Petroleum Machinery Co Ltd
Priority date: 2018-06-26
Filing date: 2018-06-26
Publication date: 2019-02-05
Anticipated expiration: 2028-06-26

Abstract

The utility model discloses a kind of structures for preventing damper screw thread to be buckled to, and the mandrel (1) including damper, mandrel (1) lower end is threadedly coupled with dampening assembly (2)；Mandrel (1) middle and lower sections are splined shaft (3), are equipped with outer shoulder (4) at the key root of splined shaft (3)；It is cased with spline body (5) outside splined shaft (3), spline body (5) is equipped with splined hole (6), is equipped with interior shoulder (7) in splined hole (6), and splined hole (6) is slidably connected with splined shaft (3)；Spline body (5) lower end is threadedly coupled with outer tube (8)；Outer shoulder (4) bottom surface and interior shoulder (7) top surface collectively form lower limit plane (9).The utility model can play the role of limit on the basis of normally transmitting torque, it is therefore prevented that screw thread is buckled to the generation of phenomenon, improves the service life of damper, reduces the number that makes a trip, reduces drilling cost.

Description

A kind of structure for preventing damper screw thread to be buckled to

Technical field

The utility model relates to a kind of structures for preventing damper screw thread to be buckled to, and belong to drilling machinery technical field.

Background technique

In petroleum, natural gas and geological prospecting drilling process, in order to reach scheduled drilling depth, drill bit is needed to do downwards Cutting movement.In drilling process, due to the variation of the factors such as drill bit structure, stratum, bit pressure, the reaction force in shaft bottom also will therewith Variation.During most common rotary drilling, lower drill string part subjects the axial compressive force and torque of alternation simultaneously, and bit pressure is super Buckling will be generated when crossing critical value, i.e., forfeiture stability, alternate torque can also make drilling tool lose torsional stability.This pressure Endangering caused by force value and the acute variation of torque mainly has the following aspects: first is that reducing the service life of drilling rod, seriously Meeting make drill rod breaking.Cause the generation of down-hole accident.Second is that destroying the best effort environment of drill bit, drill bit teeth portion is caused to fall off Or fracture, reduce drilling life of bit.Third is that causing to impact to connection screw thread, causing screw thread to be buckled to or deform can not be dismantled.

In existing drilling process, generally use drill bit top connect damper, reach reduce drilling process in drill bit by The alternation reaction force arrived is endangered to upper drilling string bring.Shock absorber structure used at present includes mandrel, mandrel top circle Arc transition position is equipped with limit sleeve, and limit sleeve is connect with spindle thread；It is cased in mandrel below limit sleeve and connects with spline body screw thread The righting sleeve connect, righting sleeve top surface and limit sleeve bottom surface collectively form lower limit plane.Mandrel lower end and dampening assembly screw thread Connection；Twice connection screw thread at prior art central axis and limit sleeve, righting sleeve and spline body, often in alternation reaction Occurs back-off phenomenon under the action of power, especially in recent years, due to the Persisting exploitation of shale gas at home, drilling condition is more disliked Bad, the phenomenon that being buckled to, is more frequent, and damper is once there is back-off phenomenon, and drilling will be forced by just losing ability to work Process must stop.It could continue operation after the damper only more renewed by trip-out.The irregular generation of this accident, pole Big reduces working efficiency, increases drilling cost.

Utility model content

The purpose of this utility model is to provide a kind of structures for preventing damper screw thread to be buckled to, to guarantee the company of damper Connecing screw thread often is not in back-off under the action of alternation reaction force, reaches due damping effect, and improves work effect Rate and the maintenance cost for reducing damper, thus overcome the deficiencies in the prior art.

To achieve the above objectives, the present invention adopts the following technical solutions:

The utility model it is a kind of prevent damper screw thread be buckled to structure, the mandrel including damper, mandrel lower end with Dampening assembly is threadedly coupled；Mandrel middle and lower sections are splined shaft, are equipped with outer shoulder at the key root of splined shaft；Spline outer shaft sleeve has spline Body, spline body are equipped with splined hole, are equipped with interior shoulder in splined hole, splined hole is slidably connected with splined shaft；Spline body lower end with External pipe thread connection；Outer shoulder bottom surface and interior shoulder top surface collectively form lower limit plane.

By adopting the above-described technical solution, the utility model is compared with prior art, the utility model utilizes double half the circumference of the sleeve where it joins the shoulders Spline mechanism cleverly solves the problems, such as the lower limit of damper, eliminates limit sleeve in the prior art and righting sleeve knot Structure simplifies design, has saved processing and material cost.The utility model can play limit on the basis of normally transmitting torque The effect of position.Prevent the generation of screw thread back-off phenomenon.The service life for improving damper reduces the number that makes a trip, drop Low drilling cost.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the prior art；

Fig. 2 is the structural schematic diagram of the utility model；

Fig. 3 is Fig. 2 3-D view；

Fig. 4 is the structural schematic diagram of the utility model mandrel；

Fig. 5 is the structural schematic diagram of spline body；

Fig. 6 is C-C cross-sectional view in figure.

In the figure, it is marked as in the outer shoulder of 1- mandrel, 2- dampening assembly, 3- splined shaft, 4-, 5- spline body, 6- splined hole, 7- Shoulder, 8- outer tube, 9- lower limit plane, 10- arc transition, 11- limit sleeve, 12- righting sleeve.

Specific embodiment

The utility model is described in further detail with reference to the accompanying drawings and examples.

The utility model be constituted according to a kind of following methods for preventing damper screw thread to be buckled to, as shown in Fig. 2, This method is improvements over the prior art；Specifically cancel the limit sleeve and righting sleeve covered in mandrel in the prior art；Together When in the spline root of mandrel add outer shoulder, collectively form lower limit using increased outer shoulder and the intracorporal interior shoulder of spline Face；The impact force for preventing vibration from generating is transferred to the threaded connection place of mandrel and dampening assembly；It causes to be threadedly coupled back-off failure.

A kind of structure for preventing damper screw thread to be buckled to of the utility model constituted according to the above method, such as Fig. 2 and Fig. 3 institute Show, which includes the mandrel 1 of damper, and 1 lower end of mandrel is threadedly coupled with dampening assembly 2；1 middle and lower sections of mandrel are splined shaft 3, It is equipped with outer shoulder 4(at the key root of splined shaft 3 and sees Fig. 4)；Spline body 5 is cased with outside splined shaft 3, spline body 5 is equipped with splined hole 6 (see figure 5), splined hole 6 is interior to see Fig. 5 equipped with interior shoulder 7(), splined hole 6 is slidably connected with splined shaft 3；5 lower end of spline body and outer Pipe 8 is threadedly coupled；Outer 4 bottom surface of shoulder and interior 7 top surface of shoulder collectively form lower limit plane 9.

Embodiment

In existing drilling process, generally use drill bit top connect damper, reach reduce drilling process in drill bit by The alternation reaction force arrived is endangered to upper drilling string bring.Shock absorber structure used at present as shown in Figure 1, include mandrel 1, Limit sleeve 11 is equipped at 1 top arc transition 9 of mandrel, limit sleeve 11 is threadedly coupled with mandrel 1 and (is connected as A herein)；Limit sleeve It is cased with righting sleeve 12 in the mandrel 1 of 11 lower sections, lower limit plane is collectively formed with 12 top surface of righting sleeve and 11 bottom surface of limit sleeve 9.12 lower end of righting sleeve is threadedly coupled with spline body 5 and (is connected as B herein)；Connection screw thread at above-mentioned A, B two, often in alternation Occurs back-off phenomenon under the action of reaction force, especially in recent years, due to the Persisting exploitation of shale gas at home, drilling condition More badly, the phenomenon that being buckled to is more frequent, and back-off phenomenon once occurs in damper, and just losing ability to work will compel Stop drilling process must.It could continue operation after the damper only more renewed by trip-out.This accident it is irregular Occur, greatly reduces working efficiency, increase drilling cost.

This example is the improvement carried out aiming at the shortcomings in the prior art.This example is as shown in Figure 1, be by existing lower limit plane 9 move to inside spline body 5, and specific practice is one outer shoulder 4 of setting on the splined shaft of mandrel 1, while in the flower of spline body 5 Shoulder 7 is effectively prevent using the lower end surface of outer shoulder 4 and the upper surface of interior shoulder 7 as lower limit plane 9 in being arranged in keyhole Because of the threaded connection place (A at) and righting sleeve 12 of limit sleeve 11 and mandrel 1 caused by the influencing of arc transition 10 in mandrel 1 and Vibration bring impact force is directly born in 5 threaded connection place of spline body (at B), and the technology for being threadedly coupled back-off failure is caused to ask Topic.

This example eliminates limit sleeve 11 in the prior art and righting sleeve 12, simplifies structure, due to eliminating limit Set 11, effectively prevent the damage on 11 center roller 1 of limit sleeve at arc transition, improves 1 intensity of mandrel.This example increases spline The length of body 5, spline body 5 have taken into account the effect of righting sleeve 12 in the prior art, by cancelling righting sleeve 12, have prevented this Locate the back-off Problem of Failure being threadedly coupled.

Claims

1. a kind of structure for preventing damper screw thread to be buckled to, the mandrel (1) including damper, it is characterised in that: mandrel (1) lower end It is threadedly coupled with dampening assembly (2)；Mandrel (1) middle and lower sections are splined shaft (3), are equipped with outer shoulder at the key root of splined shaft (3) (4)；It is cased with spline body (5) outside splined shaft (3), spline body (5) is equipped with splined hole (6), and interior shoulder is equipped in splined hole (6) (7), splined hole (6) is slidably connected with splined shaft (3)；Spline body (5) lower end is threadedly coupled with outer tube (8)；Outer shoulder (4) bottom surface Lower limit plane (9) are collectively formed with interior shoulder (7) top surface.