CN201170062Y

CN201170062Y - Oil pipe connecting-tripping device

Info

Publication number: CN201170062Y
Application number: CNU2008200792922U
Authority: CN
Inventors: 马洪宇; 陈成才; 郭桥儒
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2008-03-11
Filing date: 2008-03-11
Publication date: 2008-12-24
Anticipated expiration: 2018-03-11

Abstract

An oil pipe connecting-tripping device belongs to an oil pipe matching device under an oil exploitation well. The pressure relief type core tube is characterized in that the core tube and the positioning sleeve are provided with pressure relief through holes, annular grooves are formed in the groove holes of the locking blocks on the inner surface of the core tube, blocking shoulders are arranged on two sides of the locking blocks and are arranged in the annular grooves of the core tube. The sliding sleeve has the advantages that the blocking shoulders are arranged on the two sides of the locking block, so that the locking block can be ensured to smoothly slide into the annular groove of the sliding sleeve; under the effect of pressure liquid, after the tubular column and the oil pipe are separated, the pressure can be released through the pressure release through hole, the pressure can be obviously reflected on the pressure gauge to be rapidly reduced, namely, the tubular column and the oil pipe are separated, otherwise, the tubular column and the oil pipe are not separated, and the treatment can be carried out in time, so that the rework operation is avoided, the operation success rate is improved, and the operation cost is saved.

Description

A kind of oil pipe on-off connector

Technical field

The utility model belongs to oil exploitation down-hole oil tube corollary apparatus.

Background technology

The down-hole oil tube uncoupling device that in oil exploitation, uses; existing multiple form of structure; as Sand control joint; the fluid pressure type back-off sub; movable back-off sub; the impacting type back-off sub; a kind of safe back-off sub; the hydraulic pressure back-off sub; the back-off sub of minor diameter hydraulic pressure; on the above uncoupling joint design characteristics are arranged respectively; though all each can finish the uncoupling task; but when the uncoupling of pumpingh well laminated distributor under well card water pipe post uses; operating personnel on the ground are through after certain operation sequence; be not easy to judge very much whether it breaks away from fully; the not exclusively situation of disengaging takes place through regular meeting; the situation that the uncoupling tubing string is thrown off again after oil pipe is upwards promoted a segment distance; can cause the failure of construction operation like this; the operation of will doing over again causes waste.

The utility model content

The purpose of this utility model is a kind of oil pipe on-off connector of design, can judge the situation whether it disconnects in the down-hole easily on ground, improves card water pipe post job success ratio, avoids the operation of doing over again, and reduces operating cost.

The technical solution of the utility model is to realize like this, a kind of oil pipe on-off connector, by sliding sleeve, the core pipe, formations such as outer sleeve body, sliding sleeve is installed in the core pipe, by pin they are bound up, in the lock dog slotted eye of core pipe lock dog is housed, by screw thread positioning sleeve and pressure cap are housed respectively on core pipe top and lower end, outer sleeve body is sleeved on core pipe bottom, by lock dog outer sleeve body and core pipe is bound up, and its special character is, on core pipe and positioning sleeve, has the pressure release through hole, the place has annular groove at core pipe internal surface lock dog slotted eye, and the both sides of lock dog have shoulder block, and shoulder block places in the annular groove of core pipe.

The beneficial effects of the utility model are, use this on-off connector in card water pipe post construction operation, and under the effect of pressure fluid, sliding sleeve slides downwards because the lock dog both sides have shoulder block, can guarantee that lock dog successfully is slipped in the annular groove of sliding sleeve.After tubing string and oil pipe are thrown off, pressure fluid enters into the annular space of oil pipe and sleeve pipe by the pressure release through hole, can reflect significantly on the pressure meter that on the ground pressure descends rapidly, show that promptly tubing string and oil pipe throw off, otherwise be exactly not throw off, can in time handle, avoid the operation of doing over again, improve job success ratio, save the operating cost expense.

Description of drawings

Fig. 1 is the structural representation that partly cuts open of the present utility model;

Fig. 2 is the B-B sectional view of Fig. 1;

The specific embodiment

The upper end of core pipe 1 has the internal thread that is connected with oil pipe, and core pipe 1 top has four pressure release through hole 1a, 2a respectively by the positioning sleeve 2 that has been threaded on core pipe 1, positioning sleeve 2.Have four lock dog slotted eyes at core pipe 1 middle part, there is annular groove at 1 inner surface lock dog slotted eye place at the core pipe, and 1 lock dog 4 respectively is housed in the lock dog slotted eye, and the shoulder block of lock dog 4 both sides places in the annular groove of core pipe 1.Two tapped through holes are arranged below the lock dog slotted eye of core pipe 1,1 pin 5 respectively is installed in the tapped through hole, sliding sleeve 3 and core pipe 1 are fixed together, have annular groove on the sliding sleeve 3, in the seal groove of core pipe 1 and sliding sleeve 3, sealing ring is installed by pin 5.Core pipe 1 is bound up by screw thread and pressure cap 6.Have the locked groove of annular in the outer sleeve body 7, by four lock dogs 4 outer sleeve body 7 and core pipe 1 are bound up, have four through hole 7a on outer sleeve body 7, its lower end has external screw thread and can be connected with the upper end of boll-weevil hanger.

The use operating process of this on-off connector is: the boll-weevil hanger that will go into the well and card water packer are connected to the lower end of this on-off connector successively earlier, and the upper end of this on-off connector is connected with oil pipe.After tubing string after will connecting then is lowered into the projected depth of oil well, from well head bat 8 is put in the oil pipe, fall in the sliding sleeve 3, make the top tubing string airtight, squeeze into pressure fluid from the oil pipe inlet of well head then, its pressure is generally at 10～13MPa, under the pressure fluid effect, it is descending that bat 8 promotes sliding sleeve 3, and two shear pins 5 are cut off, and sliding sleeve 3 continues descending, drop on the pressure cap 6, pressure release through hole 1a on this moment core pipe 1 and the positioning sleeve 2,2a is communicated with oil pipe inner chamber and oil sets annular space, and the pressure in the oil pipe is released, and the ground pressure table is dropped rapidly to 0～3Mpa.Four lock dogs 4 glide and enter in the annular groove of sliding sleeve 3 at this moment, and realization core pipe 1 and outer sleeve body 7 disengagings make the oil pipe that is connected more than the core pipe be connected boll-weevil hanger below 7 with outer sleeve body and the card water seal is thrown off every organ pipe, finish mask work.

Claims

A kind of oil pipe on-off connector, by sliding sleeve (3), core pipe (1), outer sleeve body formations such as (7), sliding sleeve (3) is installed in the core pipe (1), by pin (5) they are bound up, lock dog (4) is housed in the lock dog slotted eye of core pipe (1), by screw thread positioning sleeve (2) and pressure cap (6) are housed respectively on core pipe (1) top and lower end, outer sleeve body (7) is sleeved on core pipe (1) bottom, by lock dog (4) outer sleeve body (7) and core pipe (1) are bound up, it is characterized in that, on core pipe (1) and positioning sleeve (2), has pressure release through hole (1a, 2a), the place has annular groove at core pipe (1) inner surface lock dog slotted eye, the both sides of lock dog (4) have shoulder block, and shoulder block places in core pipe (1) annular groove.