CN2119492U

CN2119492U - Elastic limit device for centralising casing

Info

Publication number: CN2119492U
Application number: CN 91229364
Authority: CN
Inventors: 王显诚; 关志文
Original assignee: Daqing Petroleum Administration Bureau
Current assignee: Daqing Petroleum Administration Bureau
Priority date: 1991-11-20
Filing date: 1991-11-20
Publication date: 1992-10-21

Abstract

The utility model discloses an elastic position limiting casing centralizer which relates to a casing centralizer used in sunken wells in oil fields. The utility model solves the problem that the arc-shaped elastic sheet of the centralizer is straighten and in failure under the effect of pressure. The strip-shaped elastic centralizer of the utility model is made into more than two continuous arc bodies, and generally three continuous arc bodies can meet design requirements, wherein, two outward convex arc bodies make the inward convex arc body in the middle and a casing body act to be a mechanical support under the effect of pressure, avoiding the problem that the outward convex arc bodies is straighten and in failure. The utility model can meet the requirement of centering the casing centralizer for vertical wells, high angle wells and horizontal wells and is favorable to improving the quality of well cementing.

Description

Elastic limit device for centralising casing

The utility model relates to elasticity limit casing centralizer in the drilled well of a kind of oil field.

The well of intact sleeve pipe under the oil field for guaranteeing the cement sealing quality, generally puts centralizer on the sleeve pipe of well lower curved section, make casing string be affixed on the borehole wall between two parties and not, can improve cemented displacement efficiency during well cementation and make cement paste be distributed in the union body outer ring space.The casing stabbing board of oil field use at present, be many monomer arc support chips to outer lug, the mechanism performance index of centralizer can satisfy the straight well requirement, but adopt above-mentioned centralizer in big gradient and horizontal well, its mechanical performance index does not then satisfy requirement, make arc become straight under pressure and lost efficacy, influence cementing quality.

The purpose of this utility model is to avoid above-mentioned weak point of the prior art, and the elasticity limit casing centralizer that a kind of each support chip is provided is a plurality of continuous arc bodies.

The purpose of this utility model can reach by the following technical programs: each bar shaped support chip is made two above continuous arc bodies, can be woven into the spring-backed quill centralizer with the two ends garter spring.

Inwardly protruding on the above-mentioned support chip between two outside protrusion arc bodies connects the formed internal diameter in arc body summit and is slightly larger than the formed internal diameter in support chip two ends.

The utility model has following effect compared to existing technology: because each bar shaped support chip is made as two above continuous arc bodies, two continuous outwards protrusion arc bodies wherein, the arc body of projection and the union body fulcrum that can constitute the centralizer elastic deformation inwards between causing under pressure, the deformable body of spacing centralizer silver reaches the purpose of using casing stabbing board.

The utility model is comparatively ideal casing stabbing board to horizontal well and high angle hole section especially.

Fig. 1 is the casing stabbing board structure chart;

Fig. 2 is half braiding hoop front view on Fig. 1;

Fig. 3 is Fig. 2 vertical view;

Fig. 4 is elasticity righting strip (sheet) front view on Fig. 1;

Fig. 5 is the left view of Fig. 4.

Below in conjunction with accompanying drawing will the utility model is described in further detail.

By Fig. 1, shown in 5, on the casing stabbing board that the braiding hoop 2 that many single-arc shaped support chips 3 are connected with two ends is constituted, each support chip is made two above continuous arc bodies.

Inwardly protruding on the above-mentioned support chip 3 between two outer lug arc bodies connects the formed internal diameter in arc body summit and is slightly larger than the formed internal diameter in support chip two ends.Having made 3 continuous arc bodies on the general support chip can meet design requirement, and middle transition connects the curvature of the curvature on arc body summit greater than two connection arc body summits simultaneously.Fig. 1, the 6th, half braiding hoop weaves swivel hook and the annular distance that is connected between the hoop with second half, makes joint pin with bearing pin 4, and wherein 5 is lock pins on 4; The 7th, weave hoop body and upwarp tongue, support chip 3 ends are passed the back and are depressed formation braiding connection sticking up tongue 7.Body resistance-strengthening tablets is a strip, and its thickness is 4mm, and width is 35mm, and length is 680mm; Outwards the protrusion arc body diameter can design according to the used bit size of drilling well, and the inwardly protruding curved inner radius is designed by institute's setting of casing size.

Claims

1, a kind ofly be used for elasticity limit casing centralizer in the drilled well of oil field, it is made up of the braiding hoop that many single-arc shaped resiliency supported sheets are connected with two ends, it is characterized in that: each support chip is made two above continuous arc bodies.

2, casing stabbing board as claimed in claim 1 is characterized in that: the inwardly protruding on the support chip between two outside protrusion arc bodies connects the formed internal diameter in arc body summit and is slightly larger than the formed internal diameter in support chip two ends.