CN201125680Y

CN201125680Y - Slips type casing tube anti-break telescopic pipe

Info

Publication number: CN201125680Y
Application number: CNU2007200450719U
Authority: CN
Inventors: 贾仲宣
Original assignee: WUXI HAOAN TECHNOLOGY DEVELOPMENT Co Ltd
Current assignee: WUXI HAOAN TECHNOLOGY DEVELOPMENT Co Ltd
Priority date: 2007-11-07
Filing date: 2007-11-07
Publication date: 2008-10-01
Anticipated expiration: 2017-11-07

Abstract

The utility model relates to a slip-type casing anti-breaking telescopic tube, specifically used for solidifying a surface out of the oil casing of the injection oil region of an oilfield by cement and preventing the oil casing from damaging due to the stratum rising after water is injected in an oil well. The utility model mainly adopts that a moveable slip is added between an inner tube and an outer tube, the outer part of the inner tube is made into a ring-shaped lug which wedges in a slip, a spring is arranged between the outer tube the inner tube and the outer tube, a seal ring is installed between the outer tube and the inner tube for sealing, a lower joint part is connected with the lower part of the outer tube. The utility model is characterized in that the structure is simple, compact and reasonable; because a surface out of the oil casing of the injection oil region of an oilfield is solidified by cement to join in the casing anti-breaking tube when the stratum rises, the stretch load exceeds the specified value, the inner tube breaks away and skids for a distance, which can prevent the casing from fracturing, can seal and guarantee the fluid in the inner tube not to reveal to the ring-shaped space, and maintains the regular production of the oil well.

Description

Slip-type casing tube break prevention compensation pipe

Technical field

The utility model relates to a kind of slip-type casing tube break prevention compensation pipe, specifically is used for the outer cement sealing face of production string pipe in oil-field flooding oil district, prevents to rise on the stratum after oil well is because of water filling to damage sleeve pipe.

Background technology

In the oil field development of water filling, oil well because of water filling after water under high pressure flee into upper formation, make and cause oil well to scrap, oil gas runs off, and rises on the stratum and damages sleeve pipe, makes the oil well can not ordinary production.

Summary of the invention

The purpose of this utility model is to overcome above-mentioned weak point, thereby a kind of slip-type casing tube break prevention compensation pipe is provided, when the upper sleeve axial tension reaches predetermined value, the slips slippage, can prevent casing failure, the fluid in guaranteeing in the pipe is not leaked in the annular space, to keep the oil well ordinary production.

Main solution of the present utility model is achieved in that

The utility model mainly adopts and add movably slips between inner and outer pipe, in the outside wedging of the interior pipe slips, adds spring between interior pipe and outer tube, between outer tube and interior pipe joint ring is installed, and is used for sealing, and the outer tube bottom connects lower contact.

Ring-shaped lug is made in the pipe outside in described.

Compared with the prior art the utility model has the following advantages:

The utility model is simple, compact and reasonable for structure; Owing to add casing tube break prevention compensation pipe more than the cement sealing face outside the production string pipe, when rising on the stratum, tensile load surpasses setting, interior pipe breaks away from, and the segment distance that slides can prevent casing failure, and can seal guarantee in fluid in the pipe be not leaked in the annular space, to keep the oil well ordinary production.

Description of drawings

Fig. 1 is the utility model structural representation.

The specific embodiment

Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:

The utility model mainly is made up of box cupling 1, interior pipe 2, outer tube 3, slips 4, spring 5, joint ring 6 and lower contact 7 etc.

The utility model mainly adopts and connect box cupling 1 on interior pipe 2, and connect with upper sleeve, interior pipe 2 is contained in the outer tube 3, it is corresponding with slips 4 that three ring-shaped lugs are made in the outside of interior pipe 2, and in the wedging slips 4, between outer tube 3 and interior pipe 2, joint ring 6 is installed up and down at adding spring 5 between interior pipe 2 and the outer tube 3, be used for sealing, outer tube 3 bottoms connect lower contact 7, connect with the bottom oil pipe.

The utility model operating principle:

The utility model is when upper sleeve rises on owing to the stratum when being subjected to axial tension; interior pipe moves up; the slips distortion, when pulling force reached predetermined value, slips was thrown off; protected upper sleeve not broken; and under the effect of spring stretching bottom sleeve pipe, axial load is removed, spring plays the cushioning effect protective casing; fluid in sealing guarantees in the pipe is not leaked in the annular space, to keep the oil well ordinary production.

Claims

1, a kind of slip-type casing tube break prevention compensation pipe, it is characterized in that adopting at interior pipe (2) and go up connection box cupling (1), interior pipe (2) is contained in the outer tube (3), in interior pipe (2) the wedging slips (4), spring (5) is arranged between interior pipe (2) and the outer tube (3), between outer tube (3) and interior pipe (2) joint ring (6) is installed up and down, outer tube (3) bottom connects lower contact (7).

2, slip-type casing tube break prevention compensation pipe according to claim 1 is characterized in that described interior pipe (2) outside is shaped on ring-shaped lug.