CN102536133B

CN102536133B - Hydraulic casing pipe centering device

Info

Publication number: CN102536133B
Application number: CN201210035980.XA
Authority: CN
Inventors: 李之桐; 王行国; 李仁朴; 王宽; 熊敏敏
Original assignee: Dongying Jianyuan Trade & Industry Co Ltd
Current assignee: Dongying Jianyuan Trade & Industry Co Ltd
Priority date: 2012-02-09
Filing date: 2012-02-09
Publication date: 2014-02-19
Anticipated expiration: 2032-02-09
Also published as: CN102536133A

Abstract

Disclosed is a hydraulic casing pipe centering device. A piston is sleeved outside a main body and connected onto the main body via a constant-pressure pin, an upper sealing ring and a lower sealing ring are disposed between the main body and the piston, a reducing circular bead is disposed on the main body between the upper sealing ring and the lower sealing ring, another reducing circular bead is arranged on the piston between the upper sealing ring and the lower sealing ring, the reducing circular bead and the piston can be fittingly sealed with the main body, lock catch threads are arranged on the main body, a lock ring is mounted on the inner wall of the piston and can be fastened with the lock catch threads on the main body, an expanding centering barrel is sleeved outside the piston, a plurality of grooves are milled on the expanding centering barrel, a cone is fixed on the inner wall of the expanding centering barrel, an inner conical hole is arranged on the upper portion of the cone, the lower portion of the piston is located in the inner conical hole of the cone, a retaining sleeve is connected to the lower portion of the main body, the expanding centering barrel is seated on the retaining sleeve, when hydraulic pressure is added in a casing pipe, hydraulic force can push the piston to move downwards, the expanding centering barrel can expand to contact with the inner wall of a shaft under effects of a conical surface, so that the casing pipe connected onto the expanding centering barrel is not located at the center in the shaft, and well cementation quality can be guaranteed.

Description

Hydraulic casing pipe centering device

Technical field

The present invention relates to the device that a kind of oil drilling completion is used, is a kind of hydraulic casing pipe centering device.

Background technology

Oil drilling will be lowered to sleeve pipe in pit shaft, then in the annular space between pit shaft and sleeve pipe, inject cement, in the annular space between pit shaft and sleeve pipe, inject cement and be called well cementation, due to well depth, sleeve pipe is lowered to rear sleeve in pit shaft can not, in the middle of pit shaft, make the annular space between its pit shaft and sleeve pipe inhomogeneous, make the rear cement sheath skewness of its well cementation, can not guarantee cementing quality, the production of the well that impact is bored, causes heavy economic losses.

Summary of the invention

The object of this invention is to provide a kind of hydraulic casing pipe centering device, prevent that sleeve pipe is not placed in the middle in pit shaft, guarantee cementing quality, after the well operation that makes to be bored, can normally produce.

The object of the present invention is achieved like this: comprise main body, level pressure pin, lock ring, piston, upper sealing ring, lower seal, cone, expansion righting cylinder, interstage sleeve, in main body, there is linked hole, piston bush is contained in outside main body, piston is connected in main body by level pressure pin, between main body and piston, there is upper sealing ring, lower seal, upper sealing ring is on linked hole, lower seal is under linked hole, main body has reducing shoulder between upper sealing ring and lower seal, the diameter at upper sealing ring place is greater than the diameter at lower seal place, piston has reducing shoulder between upper sealing ring and lower seal, make itself and piston can with main body fitted seal, in main body, there is snap close tooth, lock ring is installed on piston inner wall, lock ring can with main body on snap close tooth interlock, expansion righting jacket casing is contained in outside piston, on expansion righting cylinder, be milled with many flutings, cone is fixed on expansion righting cylinder inwall, cone top is inner circle taper hole, in the inner circle taper hole of piston bottom in cone, interstage sleeve is connected to the bottom of main body, expansion righting cylinder base is on interstage sleeve.

The invention has the beneficial effects as follows: when adding hydraulic pressure in sleeve pipe, hydraulic coupling can promote descent of piston, under taper seat effect, expansion righting cylinder can be expanded to become and contact with shaft in wall greatly, makes connection sleeve pipe thereon not placed in the middle in pit shaft, make the annular space between its pit shaft and sleeve pipe even, after injecting well cementing of cement, cement thickness is identical, can guarantee cementing quality, after the well operation that makes to be bored, can normally produce for a long time, therefore, the present invention has significant economic benefit.

Accompanying drawing explanation

Fig. 1 is embodiment of the present invention structure half sectional view.

The specific embodiment

First in conjunction with Fig. 1, embodiments of the invention are described further below.

In Fig. 1: the 1st, main body, the 2nd, level pressure pin, the 3rd, lock ring, the 4th, piston, the 5th, upper sealing ring, the 7th, lower seal, the 8th, cone, the 10th, expansion righting cylinder, the 11st, interstage sleeve.Be that embodiments of the invention comprise main body 1, level pressure pin 2, lock ring 3, piston 4, upper sealing ring 5, lower seal 7, cone 8, expansion righting cylinder 10, interstage sleeve 11, in main body 1, there is linked hole 6, piston 4 is sleeved on outside main body 1, piston 4 is connected in main body 1 by level pressure pin 2, between main body 1 and piston 4, there is upper sealing ring 5, lower seal 7, in the present embodiment, upper sealing ring 5 is arranged on main body 1 outer wall, lower seal 7 is arranged on piston 4 inwalls, gap between piston 4 and main body 1 is sealed, upper sealing ring 5 is on linked hole 6, lower seal 7 is under linked hole 6, main body 1 has reducing shoulder between upper sealing ring 5 and lower seal 7, the diameter at upper sealing ring 5 places is greater than the diameter at lower seal 7 places, piston 4 has reducing shoulder between upper sealing ring 5 and lower seal 7, make itself and piston 4 can with main body 1 fitted seal, in main body 1, there is snap close tooth, on piston 4 inwalls, lock ring 3 is installed, lock ring 3 can with main body 1 on snap close tooth interlock, expansion righting cylinder 10 is sleeved on outside piston 4, on expansion righting cylinder 10, be milled with many flutings 9, cone 8 is fixed on expansion righting cylinder 10 inwalls, cone 8 tops are inner circle taper hole, in the inner circle taper hole of piston 4 bottoms in cone 8, interstage sleeve 11 is connected to the bottom (being threaded) of main body 1, 10, expansion righting cylinder is on interstage sleeve 11.Piston 4 bottoms are outer cone, in the inner circle taper hole of the outer cone of piston 4 bottoms in cone 8.

The present invention with under sleeve pipe when needing to cement the well after in pit shaft, in sleeve pipe, beat hydraulic pressure, pressure enters from linked hole 6, make the reducing shoulder pressurized of piston 4 produce lower thrust, thereby cut off level pressure pin 2, the descending cone 8 that pushes away of piston 4, under the effect of cone 8 inner circle taper holes, piston 4 produces radial component and makes cone 8 radius vector displacements, because cone 8 is fixed on expansion righting cylinder 10, make to expand the fluting of righting cylinder 10 and the outside bulging of rib between fluting, after outer deformation is large, contact with shaft in wall, make cover be in control righting, after well cementation, cement thickness is even, guarantee that well cementation is qualified.

Piston 4 drives lock ring 3 descending together when descending, after the descending end of piston 4, lock ring 3 can with main body 1 on snap close tooth interlock, snap close tooth in main body 1 is unidirectional tooth, after snap close tooth in lock ring 3 and main body 1 interlocks, piston 4 can not rollback, and the fluting of expansion righting cylinder 10 can not regained with the rib between slotting, and the present invention can play righting sleeve pipe all the time.

The quantity of cone 8 equates with rib quantity, welds a cone 8 on each rib.Cone 8 is one with expansion righting cylinder 10, also can be processed into composite member.

Claims

1. a hydraulic casing pipe centering device, comprise main body (1), level pressure pin (2), lock ring (3), piston (4), upper sealing ring (5), lower seal (7), cone (8), expansion righting cylinder (10), interstage sleeve (11), it is characterized in that: in main body (1), have linked hole (6), piston (4) is sleeved on outside main body (1), piston (4) is connected in main body (1) by level pressure pin (2), between main body (1) and piston (4), there is upper sealing ring (5), lower seal (7), upper sealing ring (5) is on linked hole (6), lower seal (7) is under linked hole (6), main body (1) has reducing shoulder between upper sealing ring (5) and lower seal (7), the diameter that upper sealing ring (5) is located is greater than the diameter that lower seal (7) is located, piston (4) has reducing shoulder between upper sealing ring (5) and lower seal (7), make itself and piston (4) can with main body (1) fitted seal, main body has snap close tooth on (1), on piston (4) inwall, lock ring (3) is installed, lock ring (3) can with main body (1) on snap close tooth interlock, expansion righting cylinder (10) is sleeved on outside piston (4), on expansion righting cylinder (10), be milled with many flutings (9), cone (8) is fixed on expansion righting cylinder (10) inwall, cone (8) top is inner circle taper hole, in the inner circle taper hole of piston (4) bottom in cone (8), interstage sleeve (11) is connected to the bottom of main body (1), expansion righting cylinder (10) seat is on interstage sleeve (11).

2. hydraulic casing pipe centering device according to claim 1, is characterized in that: piston (4) bottom is outer cone, in the inner circle taper hole of the outer cone of piston (4) bottom in cone (8).