CN202832246U

CN202832246U - Super-thick multi-hole high-squeezing-resistant casing

Info

Publication number: CN202832246U
Application number: CN 201220476863
Authority: CN
Inventors: 林凯; 申昭熙; 王建军; 李磊
Original assignee: China National Petroleum Corp; CNPC Tubular Goods Research Institute
Current assignee: China National Petroleum Corp; CNPC Tubular Goods Research Institute
Priority date: 2012-09-18
Filing date: 2012-09-18
Publication date: 2013-03-27
Anticipated expiration: 2022-09-18

Abstract

The utility model discloses a super-thick multi-hole high-squeezing-resistant casing which is designed to solve the problems that the high-squeezing-resistant casing is high in material cost and a pipe column is large in weight. The casing is composed of a casing body and a unpunched thread joint, axial through holes are evenly arranged in the casing wall close to the outer surface of the pipe body, and the unpunched thread joint is connected with two ends of the pipe body. By adopting the design of adding the thickness of casing wall and arranging the axial through holes in the casing wall, the super-thick multi-hole high-squeezing-resistant casing has the advantages of being capable of guaranteeing strength of the casing, reducing weight of a casing pipe column, meeting requirements of used materials and strength of extension of the unpunched thread joint and conveniently choosing pipe column sleeve joints.

Description

Hyper-thick pipe porous high collapse strength

Technical field

The utility model relates to a kind of hyper-thick pipe porous high collapse strength, belongs to oil well drilling equipment technical field.

Background technology

The petroleum industry sleeve pipe is the necessary equipment in the exploitations such as oil, natural gas exploration, along with Oil/gas Well to darker future development, increase the unequal stress on stratum, wriggling stratum and salt rock stratum etc., and strata pressure also improves a lot, and the demand of high collapse strength is increased day by day.At present, existing high collapse strength all relies on increase body wall thickness and improves the body strength of materials and realize.Because the strength of materials is limited, can not strengthen without limit, and guarantee the high-intensity while of material, the high tenacity that keeps material also is relatively more difficult.Adopt the method that increases the body wall thickness, not only will increase weight and the use cost of tubing string, also so that selecting of casing joint becomes difficulty.

Summary of the invention

The purpose of this utility model is to provide a kind of hyper-thick pipe porous high collapse strength, and it can reduce the weight of down-hole casing tubing string, increases tubing string tensile strength surplus, reduces the material usage of high collapse strength.

Concrete technology contents of the present utility model is as follows:

This hyper-thick pipe porous high collapse strength is comprised of body and atresia nipple, is provided with uniform axially extending bore at the tube wall near outer surface of tube body, and the body two ends connect the atresia nipple.

The utility model has the advantage of:

This hyper-thick pipe porous high collapse strength adopts the design that increases casing wall thickness and axially extending bore is set at tube wall, can guarantee casing strength, can alleviate again the weight of sleeve pipe tubing string, satisfy the demand to use material and joint tensile strength, be convenient to selecting of tubing string casing joint.

Description of drawings

Fig. 1 is hyper-thick pipe porous high collapse strength structural representation.

Fig. 2 is hyper-thick pipe porous high collapse strength body lateral view.

Fig. 3 is hyper-thick pipe atresia high collapse strength body circumference stress distribution map under external pressure.

Fig. 4 is hyper-thick pipe porous high collapse strength body circumference stress distribution map under external pressure.

The specific embodiment

Embodiment:

With reference to Fig. 1 embodiment of the present utility model is further specified:

This hyper-thick pipe porous high collapse strength is comprised of body 1 and atresia nipple 3, is provided with uniform axially extending bore 2 at the tube wall near body 1 external surface, and body 1 two ends connect atresia nipple 3.

The concrete processing method of this heavy wall porous high collapse strength is as follows:

At first, the casing wall thickness that collapse resistance on request and outer diameter parameters calculation Design need, quantity and the diameter in hole are with reference to general seamless hyper-thick pipe sleeve pipe manufacturing process, the body 1 of processing sleeve pipe.

For reducing the weight of hyper-thick pipe pipe, guarantee that simultaneously sleeve pipe has the crowded intensity of ruining of enough critical external compressive resistances, according to the hyper-thick pipe sleeve pipe stress distribution characteristics that external surface stress is less under external pressure, at the axially extending bore 2 near the rolling rule in position of body 1 external surface of hyper-thick pipe sleeve pipe.The parameters such as the radial position of through hole 2, quantity and external diameter are determined according to wall thickness, the strength of materials and the collapsoing strength of hyper-thick pipe sleeve pipe.

Machining screw joint 3 on the atresia body of same wall thickness and external diameter adopts the methods such as friction butt welding and upset butt welding to weld respectively atresia nipple 3 at the two ends of body 1, can produce satisfactory sleeve pipe finished product.

Claims

1. hyper-thick pipe porous high collapse strength is characterized in that:

This sleeve pipe is comprised of body (1) and atresia nipple (3), is provided with uniform axially extending bore (2) at the tube wall near body (1) external surface, and body (1) two ends connect atresia nipple (3).