CN202325252U

CN202325252U - Constant torque drill bit protector

Info

Publication number: CN202325252U
Application number: CN2011204733573U
Authority: CN
Inventors: 于小波; 李欢欢; 李玉海; 杨永祥
Original assignee: Daqing Petroleum Administration Bureau; China National Petroleum Corp
Current assignee: Daqing Petroleum Administration Bureau; China National Petroleum Corp
Priority date: 2011-11-24
Filing date: 2011-11-24
Publication date: 2012-07-11
Anticipated expiration: 2021-11-24

Abstract

The utility model relates to a constant torque drill bit protector, which mainly solves the problems that the drilling speed of machinery is decreased and the drilling depth of the machinery is reduced because a drill bit works extremely unstably at the bottom of a well in the prior art. The constant torque drill bit protector is characterized in that: a spring seat (2), a spring (3) and a sealing sliding sleeve (4) are sequentially arranged inside a body (5) and contacted with one another; the top of the spring seat (2) is pressed against a step on the lower part of an upper joint (1); an upper end of a lower joint (6) is pressed against a shoulder inside the sealing sliding sleeve (4); the lower end of the sealing sliding sleeve (4) is arranged on a thrust shoulder (7) of an inner cavity of the body (5); and the lower end of the body (5) is connected with the lower joint (6) through a spiral spline.

Description

The permanent torque protection device of drill bit

Technical field

The utility model relates to the permanent torque protection device of drill bit of a kind of torque protection of drilling well aid, particularly a kind of suitable drill bit in the oil drilling technical field.

Background technology

In the oilfield drilling, the speed of what and rate of penetration of footage per bit not only depends on drill bit itself, the working condition of the selection of drilling parameter and shaft bottom drill bit when also being to use.Often owing to drill bit sticking cunning, axial vibrations, turn round and shake and drill bit harmful action such as circle round; Make drill bit not steady at the shaft bottom work utmost point; Sometimes stall is quickened sometimes, cutting teeth is caused in advance destroy, and has produced to collapse tooth and fall tooth; And then ground and cause wearing and tearing, thereby cause that rate of penetration is slack-off, drilling depth reduces.Particularly on hard formation and the staggered stratum of soft or hard, the operating mode of drill bit is more abominable, and the wearing and tearing of drill bit and the infringement of drilling tool are particularly serious.

Summary of the invention

The utility model technical problem to be solved is to overcome the drill bit that exists in the background technology work utmost point does not steadily cause the problem that rate of penetration is slack-off, drilling depth reduces in the shaft bottom; And provide a kind of drill bit permanent torque protection device; The permanent torque protection device of this drill bit can make the drill bit stable working; Keep drill bit and drilling tool intact, reach the effect that bad ground is efficiently crept in optimization.

The utility model solves its problem and can reach through following technical scheme: the permanent torque protection device of this drill bit comprises top connection, body, lower contact; Top connection links to each other through screw thread with the body upper end; Body interior is equipped with spring base, spring, sealing sliding sleeve successively, and spring base, spring, sealing sliding sleeve are in contact with one another; The spring base top is against on the step of top connection bottom, and the lower contact upper end is butted on the sealing sliding sleeve inner circular bead, and sealing sliding sleeve lower end places on the thrust shoulder of chamber body; The body lower end is connected through helical spline with lower contact.

The utility model and above-mentioned background compared with techniques can have following beneficial effect: the permanent torque protection device of this drill bit is owing to adopt said structure; Can reduce drill bit sticking sliding, turn round shake and circle round the destruction of drill bit; Make the drill bit stable working, keep drill bit and drilling tool intact, improve the scope of application of drill bit in the deep layer well; Improve application life and rate of penetration, reach the effect that bad ground is efficiently crept in optimization.

Description of drawings:

Accompanying drawing 1 is the structural representation of the utility model.

Among the figure: the 1-top connection, the 2-spring base, the 3-spring, 4-seals sliding sleeve, 5-body, 6-lower contact, 7-thrust shoulder.

The specific embodiment:

To be described further the utility model below in conjunction with accompanying drawing:

As shown in Figure 1, the permanent torque protection device of this drill bit comprises top connection 1, body 5, lower contact 6, and top connection 1 links to each other through screw thread with body 5 upper ends, and body 5 inside are equipped with spring base 2, spring 3, sealing sliding sleeve 4 successively; Spring base 2, spring 3, sealing sliding sleeve 4 are in contact with one another; Spring base 2 tops are against on the step of top connection 1 bottom, and lower contact 6 upper ends are butted on sealing sliding sleeve 4 inner circular bead, and sealing sliding sleeve 4 lower ends place on the thrust shoulder 7 of body 5 inner chambers; Body 5 lower ends and lower contact 6 are connected through helical spline.

When work, under drilling fluid and spring action, the pressure of the drill is passed to lower contact 6 through top connection 1, body 5; Synergy transfer torque through drilling fluid fluid power, spring 3, helical spline; Lower contact 6 can screw in body 5, design high pressure sealing sliding sleeve 4 in the scope that lower contact 6 tops and body 5 inside, lower contact 6 and body are 5; Confirm constant the pressure of the drill and moment of torsion by bit pressuredrop, when drill bit produced torque overload, 6 of lower contacts screwed in body 5; Thrust shoulder 7 restriction lower contacts 6 screw-in depths are arranged in the body 5, convert the ability of overload the potential energy of spring 3 to, thereby reduce overload the pressure of the drill moment of torsion; Make moment of torsion keep constant, the minimizing drill bit circles round and glues and slides, and reaches the purpose of two-way damping; And then protection drill bit and drilling tool, employed drill bit is the PDC drill bit.

Claims

1. the permanent torque protection device of a drill bit; Comprise top connection (1), body (5), lower contact (6); Top connection (1) links to each other through screw thread with body (5) upper end; It is characterized in that: described body (5) inside is equipped with spring base (2), spring (3), sealing sliding sleeve (4) successively, and spring base (2), spring (3), sealing sliding sleeve (4) are in contact with one another; Spring base (2) top is against on the step of top connection (1) bottom, and lower contact (6) upper end is butted on sealing sliding sleeve (4) inner circular bead, and sealing sliding sleeve (4) lower end places on the thrust shoulder (7) of body (5) inner chamber; Body (5) lower end is connected through helical spline with lower contact (6).