阅读说明：本技术 一种井下离合器 (Underground clutch ) 是由 梁杰 侯立东 于紫迁 于 2020-07-02 设计创作，主要内容包括：本发明的一种井下离合器涉及一种油田钻井用工工具,上旋转接头的下端缩径处座于下旋转接头的卡台上,在上旋转接头的中下段有环形凸台Ⅰ、在下旋转接头上有环形定位卡台,在上旋转接头和下旋转接头的连接处罩有花键活塞体,在环形定位卡台上部的下旋转接头上设有环形卡台,在环形定位卡台上部的下旋转接头的环壁上开有进液口,在花键活塞体的内壁固定有环形凸台Ⅲ。本发明的一种井下离合器,结构设计合理,通过开泵循环达到一定排量后泥浆经尾管或筛管底部组合产生的压降作用于该工具,使得该工具上花键系统分离,上部可自由旋转,而工具下部的尾管或筛管不旋转,从而上部钻具重量的钻压有效传递,安全送尾管或筛管使其顺利下入,提高作业效率。(The invention discloses an underground clutch, and relates to a tool for oil field drilling, wherein a reducing part at the lower end of an upper rotary joint is seated on a clamping table of a lower rotary joint, an annular boss I is arranged at the middle lower section of the upper rotary joint, an annular positioning clamping table is arranged on the lower rotary joint, a spline piston body is covered at the joint of the upper rotary joint and the lower rotary joint, an annular clamping table is arranged on the lower rotary joint at the upper part of the annular positioning clamping table, a liquid inlet is formed in the annular wall of the lower rotary joint at the upper part of the annular positioning clamping table, and an annular boss III is fixed on the inner wall of the spline piston body. The underground clutch has reasonable structural design, and after the pump circulation is started to reach a certain discharge capacity, the pressure drop generated by the combination of the bottoms of the tail pipes or the sieve pipes of the slurry acts on the tool, so that the spline system on the tool is separated, the upper part can rotate freely, the tail pipes or the sieve pipes at the lower part of the tool do not rotate, the weight of a drilling tool at the upper part is effectively transferred, the tail pipes or the sieve pipes are safely fed to enable the drilling tool to be smoothly fed in, and the operation efficiency is improved.)

1. A clutch in the pit, it is formed by upper rotary joint (1) and lower rotary joint (2), the lower end reducing department of the upper rotary joint (1) is seated on the chuck of the lower rotary joint (2) to make it form the liquid through hole (3) with the same diameter from top to bottom, its characteristic is that there are annular bosses I (4) in the middle and lower section of the upper rotary joint (1), there are annular locating chucks (5) on the lower rotary joint (2), there are spline piston bodies (6) at the junction of the upper rotary joint (1) and lower rotary joint (2), and the both ends of the spline piston body (6) locate in the upper portion of the annular boss I (4) and lower portion of the annular locating chuck (5) and cooperate with it, there are annular chucks (7) on the lower rotary joint (2) on the upper portion of the annular locating chucks (5), there are liquid inlets (9) on the annular wall of the lower rotary joint (2) on the upper portion of the annular locating chucks (5), an annular boss III (8) is fixed on the inner wall of the spline piston body (6), the annular boss III (8) moves up and down in an annular groove between the annular positioning clamping table (5) and the annular clamping table (7), and the lower limit point is the upper wall of the liquid inlet (9).

2. A downhole clutch according to claim 1, wherein the upper rotary joint (1) is provided with two vertically spaced locking grooves (10), the upper end of the spline piston body (6) is provided with a locking pin shaft (11), the locking pin shaft (11) is sleeved with a spring (12), and the tail end of the locking pin shaft is arranged in the locking groove (10).

3. A downhole clutch according to claim 2, wherein the locking pin shaft (11) terminates with a conical surface.

4. A downhole clutch according to claim 1, characterised in that bearing balls i (13) and annular sealing rings (14) are provided on the vertical faces where the upper swivel (1) and the lower swivel (2) are joined.

5. A downhole clutch according to claim 1, wherein the annular boss iii (8) and the lower rotary joint (2) and the annular retainer (5) and the splined piston body (6) are provided with annular sealing rings on their contact surfaces.

6. A downhole clutch according to claim 1, wherein bearing balls ii (15) are mounted on the contact surface of the lower end of the splined piston body (6) with the lower swivel (2).

7. A downhole clutch according to claim 2, wherein the travel a of the splined piston body (6) is the same distance as the two locking grooves (10).

Technical Field

The invention relates to an oil field drilling tool, in particular to an underground clutch.

Background

When a drilling tool is used for feeding a tail pipe and a sieve pipe in a large-displacement well or a horizontal well, due to the reasons that the track of the well is unsmooth, the curvature is large, the tail pipe or the sieve pipe is not recommended to rotate generally and the like, the weight of an upper drilling tool cannot be effectively transferred to the tail pipe or the sieve pipe, after the drilling tool enters an open hole section, the friction resistance is increased, the tail pipe or the sieve pipe cannot normally fall to the bottom of the well, the tail pipe or the sieve pipe is easy to block after the treatment time is slightly long, and the well is even scrapped due to the underground complication and the large treatment difficulty, so that.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a downhole clutch.

The invention relates to an underground clutch which comprises an upper rotary joint and a lower rotary joint, wherein the reducing part at the lower end of the upper rotary joint is seated on a clamping table of the lower rotary joint to form a liquid through hole passage with the same upper and lower diameters, an annular boss I is arranged at the middle lower section of the upper rotary joint, an annular positioning clamping table is arranged on the lower rotary joint, a spline piston body is covered at the joint of the upper rotary joint and the lower rotary joint, and two ends of the spline piston body are respectively arranged at the upper part of the annular boss I and the lower part of the annular positioning clamping table and matched with the annular boss I and the annular positioning clamping table, an annular clamping table is arranged on the lower rotary joint at the upper part of the annular positioning clamping table, a liquid inlet is arranged on the annular wall of the lower rotary joint at the upper part of the annular positioning clamping table, an annular boss III is fixed on the inner wall of the spline piston body, moves up and down in an annular groove between the annular positioning clamping table and the annular clamping table, and the lower limit point is the upper wall of the liquid inlet.

As a further improvement of the invention, the upper rotary joint is provided with two vertically spaced locking grooves, the upper end of the spline piston body is provided with a locking pin shaft, the locking pin shaft is sleeved with a spring, and the tail end of the locking pin shaft is arranged in the locking groove.

As a further improvement of the invention, the tail end of the lock pin shaft is a conical surface.

As a further improvement of the invention, a bearing steel ball I and an annular sealing ring are arranged on a vertical surface where the upper rotary joint and the lower rotary joint are connected.

As a further improvement of the invention, the contact surfaces of the annular boss III and the lower rotary joint, and the annular positioning clamping table and the spline piston body are respectively provided with an annular sealing ring.

As a further improvement of the invention, a bearing steel ball II is arranged on the contact surface of the lower end of the spline piston body and the lower rotary joint.

As a further improvement of the invention, the stroke a of the spline piston body is the same as the distance between two locking grooves.

The underground clutch has reasonable structural design, when the friction resistance of a tail pipe or a sieve pipe entering an open hole section is increased and the drilling is difficult to continue, the pressure drop generated by the combination of the bottoms of the tail pipe or the sieve pipe after the tail pipe or the sieve pipe reaches a certain discharge capacity through the pump circulation acts on the tool, so that the spline system on the tool is separated, the upper part can rotate freely, the tail pipe or the sieve pipe at the lower part of the tool does not rotate, the drilling pressure of the weight of an upper drilling tool is effectively transferred, the tail pipe or the sieve pipe is safely conveyed to enable the tail pipe or the sieve pipe to be smoothly fed.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is an enlarged view of a portion a of fig. 1.

Detailed Description

The invention relates to an underground clutch which comprises an upper rotary joint 1 and a lower rotary joint 2, wherein the diameter-reducing part at the lower end of the upper rotary joint 1 is seated on a clamping table of the lower rotary joint 2 to form a liquid through hole channel 3 with the same upper and lower diameters, a bearing steel ball I13 and an annular sealing ring 14 are arranged on the vertical surface connected by the upper rotary joint 1 and the lower rotary joint 2, and the bearing steel ball 13 is loaded from the outer wall and axially fixed to realize radial rotation; the annular sealing ring 14 is mounted in a sealing groove of the upper swivel 1.

An annular boss I4 is arranged at the middle lower section of the upper rotary joint 1, and two locking grooves 10 which are spaced up and down are formed in the upper rotary joint 1 at the upper part of the annular boss I4.

An annular clamping table 7 and an annular positioning clamping table 5 are respectively arranged on the lower rotary joint 2 from top to bottom, a spline piston body 6 is covered at the joint of the upper rotary joint 1 and the lower rotary joint 2, and the two ends of the spline piston body 6 are respectively arranged on the upper part of the annular boss I4 and the lower part of the annular positioning clamping table 5 to be tightly matched. More than three pin holes 16 are formed in the periphery of the upper end of the spline piston body 6, the pin holes 16 are communicated with the inner wall and the outer wall of the spline piston body 6 through communication holes, a lock pin shaft 11 is installed in the pin hole of the spline piston body 6, penetrates through the communication holes, the tail end of the lock pin shaft is arranged in a lock groove 10, a baffle plate 17 is fixed on the lock pin shaft 11, a spring 12 is sleeved on the lock pin shaft 11, one end of the spring 12 abuts against the baffle plate 17 to be pressed, the other end abuts against the outer cavity wall of the pin hole 16 (shown in figure 2), and the tail end of the lock pin shaft 11 is a conical surface; install bearing steel ball II 15 on the lower extreme of spline piston body 6 and lower rotary joint 2's the contact surface, bearing steel ball II 15 is fixed on the lateral wall of the hole of spline piston body 6, reduces the spline piston body and when upwards walking with the effect of lower rotary joint contact surface friction.

The liquid inlet 9 is formed in the annular wall of the lower rotary joint 2 on the upper portion of the annular positioning clamping table 5, the annular boss III 8 is fixed on the inner wall of the spline piston body 6, the annular boss III 8 moves up and down in an annular groove between the annular positioning clamping table 5 and the annular clamping table 7, the lower limit point is the upper wall of the liquid inlet 9, and the distance between the stroke a of the spline piston body 6 and the distance between the two locking grooves 10 are equal.

The outer diameters of the annular boss I4, the annular positioning clamping table 5 and the annular clamping table 7 are equal, and are equal to the inner diameter of the spline piston body 6; the inner diameter of the annular boss III 8 is the same as the outer diameters of the upper rotary joint 1 and the lower rotary joint 2.

An annular sealing ring is arranged on the contact surface of the annular boss III 8 and the lower rotary joint 2, and the annular sealing ring is arranged in an inner diameter sealing groove of the annular boss III 8; and an annular sealing ring is arranged on the contact surface of the annular positioning clamping table 5 and the spline piston body 6, and the annular sealing ring is arranged in an outer diameter sealing groove of the annular positioning clamping table 5.

The main material of the device is 4145H, 4140 and 4130 metal material, and the sealing material is hydrogenated butyl rubber, fluororubber, polytetrafluoroethylene, PTFE +25% carbon, polyurethane and other non-metal materials;

according to the underground clutch, the upper rotary joint 1 and the lower rotary joint 2 are connected together through the spline structure of the spline piston body 6 before the tool function is triggered (as shown in figure 1), internal threads on the upper portion of the upper rotary joint 1 can be connected with a drill rod drilling tool, external threads on the lower portion of the rotary joint 2 can be connected with the drill rod drilling tool, and the rotary joints rotate simultaneously when the drilling tool is started. When the tool function is triggered, high-pressure liquid injected in the liquid supply direction b flows into a piston cavity of the spline piston body 6 through a hydraulic liquid inlet 9 of the lower rotary joint 2, the spline piston body 6 is pushed to move upwards according to the piston moving direction, the spline piston body 6 makes the lock pin shaft 11 stressed when moving upwards, the conical surface slides upwards to enable the spring 12 to bounce and contract, the lock pin shaft 3 is separated from the lower lock groove 10, the spline piston body 6 continues to move upwards along with the continuous increase of the supplied liquid, when the bearing steel ball 15 moves to the position of the annular positioning clamping table 5 of the lower rotary joint 2 (namely the moving stroke a), the upper end of the spline piston body 6 moves to the position of the upper lock groove 10, the spring bounces and the lock pin shaft, the spline piston body 6 is locked, the spline piston body 6 cannot slide down for two times under other acting forces of stopping the pump by external force to be connected with the, the drilling machine drives the upper part of the drill rod rotating tool to keep rotating, and the lower part of the drill rod rotating tool can keep static.