CN201857931U

CN201857931U - Tubing plug

Info

Publication number: CN201857931U
Application number: CN2010202907576U
Authority: CN
Inventors: 王海龙; 尚玉星; 顾明祥; 董乔云
Original assignee: YANCHENG XINYUAN PETROCHEMICAL MACHINERY CO Ltd
Current assignee: YANCHENG XINYUAN PETROCHEMICAL MACHINERY CO Ltd
Priority date: 2010-08-13
Filing date: 2010-08-13
Publication date: 2011-06-08
Anticipated expiration: 2020-08-13

Abstract

The utility model relates to a tubing plug, which comprises a release sub, a core shaft, a spindle nut, a righting body, backing-up screws, wiper blocks, springs, a flap-opening slip, a cone, a rubber tube, a lower end connector, a top dead center, a bottom dead center and track pins, wherein three righting grooves are evenly distributed on the peripheral surface of the righting body; the springs are arranged in the wiper blocks and assembled to the righting grooves of the righting body; the upper end of the righting body is connected with the spindle nut through a thread, and the lower end of the righting body is connected with the flap-opening slip through a thread; the threaded joints at the upper end and the lower end of the righting body are fixed through the backing-up screws respectively; the combined part is screwed into the core shaft through a sawtooth-shaped transmission thread on the spindle nut; the cone and the rubber tube are sleeved on the core shaft in sequence; the lower end connector is connected with the core shaft through a thread, and fixed with the core shaft through the backing-up screws; and the track pin at the upper end of the core shaft is hung at the bottom dead center of a track groove of the release sub. The tubing plug has the advantages of simple structure and fewer working procedures, is simple and convenient to operate, and can be reused as required.

Description

Tubing plug

Technical field

The utility model relates to the capping tools that a kind of oilfield is used, and specially refers to a kind of tubing plug that stops up the next stage oil pipe when being used for the down-hole and playing oil pipe.

Background technology

Rise in the oil pipe process in the oil-water well well workover, sometimes borehole pressure height, well liquid sprays in oil pipe, and environment is polluted, bring very big difficulty to well workover, make the oil-water well can not operation, need carry out could continuing operation after the kill-job construction, increase kill-job construct the kill-job equipment and the goods and materials of needs oil-water well, engineering time is long, consume greatly the waste great amount of manpower, material resources, and well killing fluid can damage the stratum, oil well output is reduced, can not realize the quick reparation of oil-water well, a kind of tubing plug in the existing technology is in daily use, can be because most tube inner wall fouling be serious, not in place under the blocking device, plug depth is more shallow, has made that the flowline time is longer, frequent in addition use is bigger to the infringement of blanking plug, operating efficiency is low, and difficult the repeated use directly influenced economic benefit and job performance.

Summary of the invention

In order to overcome above-mentioned defective of the prior art, the object of the present invention is to provide a kind of tubing plug, solved existing blanking plug, stop up not in place, depth as shallow, complicated operation is difficult to reusable a series of deficiency, and simple in structure, easy and simple to handle, reusable, the activity duration is short, the economic benefit height.

In order to achieve the above object, the utility model is achieved through the following technical solutions:

Tubing plug comprises back-off sub, mandrel, and the mandrel nut, centralizer body, backing-up screw, wiper block, spring is opened the lobe slips, cone, packing element, lower end connector, top dead-centre, bottom dead centre, track pin.Uniform three righting troughs on the peripheral surface of centralizer body, spring is placed wiper block, and be assembled in the righting trough of centralizer body, described spring and wiper block have three groups, the upper end of centralizer body is connected with the mandrel nut by screw thread, the lower end also by screw thread with open the lobe slips and be connected, connection of thread is fixed with backing-up screw respectively at the two ends up and down of centralizer body, spring, wiper block, centralizer body, the mandrel nut, open the lobe slips, backing-up screw, become a composite member with assembled in sequence by the above-mentioned steps method, on described mandrel and the mandrel nut sawtooth motion thread is set, again this composite member is screwed on the mandrel by the sawtooth motion thread on the mandrel nut, cone, packing element is nested on the mandrel successively, the lower end connector is connected with mandrel by screw thread, between fix by backing-up screw, the track groove that one group of symmetry is arranged on the lower end external cylindrical surface of described back-off sub, top dead center is short track groove to the bottom dead centre place, top dead center to track channel opening place is long track groove, the track pin of mandrel upper end is suspended to the bottom dead centre place of back-off sub track groove.

Operating principle of the present utility model is, when going into the well, back-off sub is connected to the lower end of rod string, and rises down to needs in the next stage pipeline of oil pipe, last shadoof post also just changes, along with rotating under the up effect at mandrel, cone enters out the lobe slips, and when opening the lobe slips and strut on the grappling tubing wall, continuing just changes, the compression packing element, finish setting, after setting, roofbolt moves down the track pin that makes on the mandrel slightly and enters the short track groove top dead-centre of back-off sub, roofbolt is carried on when just changeing, make the track pin enter long track groove, last shadoof post can be realized giving up, when the arts demand deblocking trips out blanking plug, the track pin is introduced the long track groove of back-off sub, roofbolt is descending in counter-rotating, makes the track pin enter the top dead-centre of short track groove, carries on then and enters bottom dead centre, at this moment, the counter-rotating roofbolt, mandrel is descending, and cone is thrown off, packing element shrinks, and can trip out instrument by deblocking.

Usefulness of the present utility model is that product structure is simple, on mandrel and the mandrel nut sawtooth motion thread is set, and flow chart is few, and is easy and simple to handle, can reuse as required.

Description of drawings

Fig. 1 is a section of structure of the present utility model

Fig. 2 is that track grooved rail mark launches schematic diagram on the cylindrical of back-off sub of the present utility model lower end

Fig. 3 is a mandrel of the present utility model upper end track pin outline drawing, in figure one, figure two, figure three:

The 1-back-off sub, the 2-mandrel, 3-mandrel nut, the 4-centralizer body, 5,8, the 12-backing-up screw, the 6-wiper block, 7-spring, 9-are opened the lobe slips, 10-cone, 11-packing element, 13-lower end connector, 14-top dead-centre, 15-bottom dead centre, 16-track pin.

The specific embodiment

Below in conjunction with Figure of description structural principle of the present utility model and operating principle are done further narration.

With reference to Figure of description one, two, three, tubing plug comprises back-off sub 1, mandrel 2, mandrel nut 3, centralizer body 4, backing-up screw 5,8,12, wiper block 6, spring 7 is opened lobe slips 9, cone 10, packing element 11, lower end connector 13, top dead-centre 14, bottom dead centre 15, track pin 16.It is characterized in that: uniform three righting troughs on the peripheral surface of centralizer body 4, spring 7 is placed wiper block 6, and be assembled in the righting trough of centralizer body 4, described spring 7 has three groups with wiper block 6, the upper end of centralizer body 4 is connected with mandrel nut 3 by screw thread, fixing with backing-up screw 5, the lower end also by screw thread with open lobe slips 9 and be connected, fixing with backing-up screw 8, spring 7, wiper block 6, centralizer body 4, mandrel nut 3, open lobe slips 9, backing-up screw 5,8, become a composite member with assembled in sequence by the above-mentioned steps method, on described mandrel 2 and the mandrel nut 3 the sawtooth motion thread is set, again this composite member is screwed on the mandrel 2 by the motion thread on the mandrel nut 3, cone 10, packing element 11 is nested on the mandrel 2 successively, lower end connector 13 is connected with mandrel 2 by screw thread, between fixing by backing-up screw 12, the track groove that one group of symmetry is arranged on the lower end external cylindrical surface of described back-off sub 1, top dead-centre 14 places to bottom dead centre 15 places are short track groove, top dead center 14 to track channel opening place is long track groove, the track pin 16 of mandrel upper end is suspended to the bottom dead centre place 15 of back-off sub 1 track groove.

Operating principle of the present utility model is, when going into the well, back-off sub 1 is connected to the lower end of rod string, and rises down to needs in the next stage pipeline of oil pipe, last shadoof post also just changes, along with rotating under the up effect at mandrel 2, cone 10 enters out lobe slips 9, and when opening lobe slips 9 and strut on the grappling tubing wall, continuing just changes, compression packing element 11, finish setting, after setting, roofbolt moves down the track pin 16 that makes on the mandrel slightly and enters the short track groove top dead-centre 14 of back-off sub 1, roofbolt is carried on when just changeing, make track pin 16 enter long track groove, last shadoof post can be realized giving up, when the arts demand deblocking trips out blanking plug, track pin 16 is introduced the long track groove of back-off sub 1, roofbolt is descending in counter-rotating, makes track pin 16 enter the top dead-centre 14 of short track groove, carries on then and enters bottom dead centre 15, at this moment, the counter-rotating roofbolt, mandrel 2 is descending, and cone 10 is thrown off, packing element 11 shrinks, and can trip out instrument by deblocking.

Claims

1. tubing plug, comprise back-off sub, mandrel, the mandrel nut, centralizer body, backing-up screw, wiper block, spring, open the lobe slips, cone, packing element, the lower end connector, top dead-centre, bottom dead centre, the track pin, it is characterized in that: uniform three righting troughs on the peripheral surface of centralizer body place wiper block with spring, and are assembled in the righting trough of centralizer body, the upper end of centralizer body is connected with the mandrel nut by screw thread, the lower end also by screw thread with open the lobe slips and be connected, connection of thread is fixed spring respectively with backing-up screw at the two ends up and down of centralizer body, wiper block, centralizer body, the mandrel nut, open the lobe slips, backing-up screw, become a composite member with assembled in sequence by the above-mentioned steps method, again this composite member is screwed on the mandrel cone by the sawtooth motion thread on the mandrel nut, packing element is nested on the mandrel successively, and the lower end connector is connected with mandrel by screw thread, between fix by backing-up screw, top dead center is short track groove to the bottom dead centre place, top dead center to track channel opening place is long track groove, the track pin of mandrel upper end is suspended to the bottom dead centre place of back-off sub track groove.

2. a kind of tubing plug according to claim 1 is characterized in that: spring and wiper block have three groups.

3. a kind of tubing plug according to claim 1 is characterized in that: on described mandrel and the mandrel nut sawtooth motion thread is set.

4. a kind of tubing plug according to claim 1 is characterized in that: the track groove that one group of symmetry is arranged on the lower end external cylindrical surface of described back-off sub.