CN2186828Y

CN2186828Y - Double-cone thermal expansion spacer

Info

Publication number: CN2186828Y
Application number: CN 94225199
Authority: CN
Inventors: 孙宇平; 杨林; 赵忠信; 刘喜林; 蒋生健; 吕振家; 陈轩
Original assignee: Shenyang University of Technology
Current assignee: Shenyang University of Technology
Priority date: 1994-01-27
Filing date: 1994-01-27
Publication date: 1995-01-04
Anticipated expiration: 2004-01-27

Abstract

The utility model relates to a double-cone thermal expansion spacer, belonging to the sealing field. The utility model particularly the double-cone thermal expansion spacer used for the steam injection well in the process of the heavy oil exploitation of the oil field. The utility model comprises a central pipe 1, an expanding barrel 2, a sealing sleeve 3, a sealing sleeve 4, and a cone sleeve 5. Both ends of the outer margin of the spacer are the cone structure; the cone angle of the double-cone thermal expansion spacer is alpha; the sealing sleeve adopts the three-segment variable cross-section form; the middle segment of the sealing sleeve is the cylinder whose diameter is maximum; the diameters of the upper segment and the lower segment of the sealing sleeve are reduced toward both ends so as to form the cone shape; the cone angle is the alpha. The expansion agent is injected in an expansion chamber M which is composed of the central pipe 1 and the expanding barrel 2; after heating, the internal pressure of the expansion chamber is increased to make the expansion barrel 2 conduct the expansion sealing operation; the new sealing mode has rapid sealing operation, convenient installation, and easy demolition; the new sealing mode can not easily appear the clamped phenomenon and can make the sealed object used repeatedly.

Description

Double-cone thermal expansion spacer

A kind of bicone heat expansion type packet belongs to field of sealing technology, and the bicone heat expansion type packet that the steam well is used is annotated in particularly a kind of oil-field thick-oil exploitation.

The oil-field thick-oil exploitation is usually adopted to underground injection steam and is heated, make the method for pumping again after the viscous crude desaturation, in order to prevent overflowing and heat loss of in annotating steam process steam, between gas-injecting pipe and well casing, must carry out effective heat-insulating and sealing, the packet that uses has packing_seal, mechanical seal, hydraulic pressure sealing etc. at present, ubiquity complex structure, sealability instability, problems such as effect of heat insulation difference, existing heat expansion type packet also exists installs difficulty, it is longer that deblocking is removed the cycle after the gas injection, deficiency such as can only once use.

The purpose of this utility model is to provide that a kind of sealing is reliable rapidly, easy for installation, deblocking is removed easily and reused heat expansion type packet.

Bicone heat expansion type packet, comprise center tube, expansion cylinder stuffing box gland, tapered sleeve, it is characterized in that the outside of center tube and expansion cylinder are affixed, the stuffing box gland in the expansion cylinder outside is three sections variable cross section bodies, its stage casing is the Cylinder stuffing box gland, and two sections are α for the cone angle of symmetry.The cone stuffing box gland, respectively there is the affixed cone structure that becomes cone angle of tapered sleeve and center tube and expansion cylinder on the top of upper-lower seal cover.Packet external profile diameter φ D is 0.2-1.5 with the ratio of packet effective length L, and the wall thickness δ of expansion cylinder is 0.5-5mm, and the length L 1 of stage casing Cylinder stuffing box gland is 1/50-48/50 with the ratio of stuffing box gland total length L 0, α.Cone angle is 2-50 °, α.Cone angle is 0.2-10 °.

Advantage of the present utility model is that its packet outer rim two ends are cone, stuffing box gland adopts three sections variable cross section forms again, shorten packet maximum diameter length effectively, relative deformation was little after expansion cylinder was subjected to inner-pressure expansion, and increased relative sealing area, can enter sealing state fast, the cone at two ends can play leading role when installing and remove simultaneously, can self-alignment insert when meeting the caliber variation, pass through smoothly under external force, contingent stuck phenomenon when having reduced installation and having removed packet, and can reuse.

Fig. 1 is the structure of bicone heat expansion type packet.

Embodiment is described in detail in detail in conjunction with the accompanying drawings:

Bicone heat expansion type packet comprises center tube 1, expansion cylinder 2,

stuffing box gland

3,4, tapered sleeve 5, center tube 1, expansion cylinder 2, tapered sleeve 5 are for being welded to connect, the stuffing box gland in expansion cylinder 2 outsides is three sections variable cross section bodies, and stage casing stuffing box gland 4 is a Cylinder, and two sections stuffing box gland 3 is α for the cone angle of symmetry.Cone, the cone angle of tapered sleeve 5 is α, its dependency structure parameter is L1/L0=0.3, α.=1.5 °, α=15 °, D/L=0.52, δ=2.4mm(L1 are stuffing box gland 4 length, and L0 is the stuffing box gland total length, and D is the packet external profile diameter, and L is the packet effective length, δ is the expansion cylinder wall thickness).In the ring cavity M that center tube 1 and expansion cylinder 2 constitute, be marked with swelling liquid, the back ring cavity M internal pressure of being heated raises rapidly expansion cylinder is expanded, and the stuffing box gland diameter increases thereupon, and stuffing box gland 3 compresses with the borehole wall and reaches sealing purpose, and stuffing box gland 4 plays auxiliary seal.

Claims

1, a kind of bicone heat expansion type packet, comprise center tube, expansion cylinder, stuffing box gland, tapered sleeve, the outside and the expansion cylinder that it is characterized in that center tube (1) are affixed, the stuffing box gland in expansion cylinder (2) outside is three sections variable cross section bodies, its stage casing is Cylinder stuffing box gland (4), and two sections are 0.2-10 ° cone angle of symmetry.Cone stuffing box gland (3), it is the cone structure of α with center tube (1) with the affixed 2-50 of one-tenth of expansion cylinder (2) ° cone angle that respectively there is tapered sleeve (5) on the top of upper-lower seal cover (3).

2, bicone heat expansion type packet according to claim 1, the external profile diameter φ D that it is characterized in that packet is 0.2-1.5 with the ratio of packet effective length L.

3, bicone heat expansion type packet according to claim 2, the wall thickness that it is characterized in that described expansion cylinder (2) is 0.5-5mm, can adopt the carbon steel of carbon containing 0.2-0.6%, also can adopt the low alloy steel of carbon containing 0.2-0.6% to make.

4, bicone heat expansion type packet according to claim 3, the length L 1 that it is characterized in that said stuffing box gland (4) is 1/50-48/50 with the ratio of the total length L 0 of stuffing box gland.

5,, it is characterized in that expansion cylinder (2), tapered sleeve (5) can be made as one according to the said bicone heat expansion type of claim 4 packet.