CN2519011Y

CN2519011Y - Non-threaded joint coupling oil tube for oil well

Info

Publication number: CN2519011Y
Application number: CN 01272058
Authority: CN
Inventors: 崔凤梅
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-12-07
Filing date: 2001-12-07
Publication date: 2002-10-30
Anticipated expiration: 2011-12-07

Abstract

The utility model provides a non-threaded joint coupling oil tube for oil well for oil pumping, gas pumping, testing, and compression fracturing and acidifying used. The technical proposal of the utility model is that: the internal and external thread joint coupling oil tubes with different structures are expandedly connected or welded on the two ends of the oil tube main body through expansion joint or welded joint. The utility model solves the problem that: as the two ends of the oil tube are both provided with a thread, the oil tube weight is increased when the wall thickness of the oil tube is increased, so that the cost is increased; and the oil tube material grade is increased to increase the thread connection performance, which will make the cost increase. The utility model has the advantages of maximizing the material performance, reducing the material consumption, decreasing the oil tube production cost and operation cost. The utility model can be widely used in underground operations such as oil filed oil pumping and gas pumping.

Description

Oil well is with non-threaded connection coupling type oil pipe

The utility model provides a kind of oil field to recover the oil, adopt " oil well with non-threaded connection coupling type oil pipe " that vapour, test, de-plugging, pressure break, acidifying underground work uses.

The current petroleum industry of China needs a large amount of oil pipes, need few hundred thousand tonnes of every year, fund is above more than 20 hundred million yuan, the oil pipe two ends are threaded, be mainly used in oil recovery, gas production, test, de-plugging, pressure break, underground work such as acidifying, the oil pipe that often uses can be divided into be threaded coupling type oil pipe and IJTBG by its form of structure at present, because these oil pipe body two ends are all threaded, therefore, in order to guarantee in certain anti-of oil pipe, the requirement of mechanical performance such as external pressure strength and tensile strength, need the oil pipe body thickness bigger than the thickness that satisfies actual needs, the oil pipe thickness that requires like this to buy is exactly that actual needs thickness adds the depth of thread, has wasted a large amount of steel and fund virtually.The another one problem is that it is because oil pipe end threaded portion generation problem that the present oil pipe that uses, its failure mode have more than 80 percent, in order to improve the reliability that is threaded, except guaranteeing machining accuracy, also need the steel of higher level, so just make the cost of oil pipe raise.

At above-mentioned problems of the prior art, the purpose of this utility model is to overcome deficiency of the prior art, and " oil well with non-threaded connection coupling type oil pipe " that provide that the oil recovery of a kind of oil field, gas production, test, de-plugging, pressure break, acidifying underground work uses, conform to production requirement fully through oil pipe mechanical performance on probation, can save great deal of steel and fund simultaneously.

The utility model is to realize like this, at first buy material requested from market by accompanying drawing and designing requirement, then make expanded joint internal thread box cupling and expanded joint external screw thread box cupling by Fig. 1, the internal thread box cupling is enclosed within the design attitude of oil pipe body with the expanded joint equipment of special use, carry out expanded joint with expanded joint equipment then, in the expanded joint process, oil pipe body expanded joint position outwards dilates, under suitable tension force effect, certain plastic strain takes place in the oil pipe body, and it is mobile to produce certain plasticity, make the part base metal be entered expanded joint groove in the box cupling by backing, at last the roll extrusion flange is passed through in the end of oil pipe body, charge into giving in the box cupling and stay groove, box cupling and oil pipe body form same the using with same equipment of interference and mechanical bond and the expanded joint external screw thread are then constituted " oil well with the non-threaded coupling type oil pipe that is connected " with formation interference of oil pipe body and mechanical bond with quadrat method and also can make " non-threaded connection welded type box cupling connection oil pipe " with welding manner by Fig. 2 like this, welding internal thread box cupling and welding external screw thread box cupling are not established the expanded joint groove, can directly need and design by producing, related standards is made in the welding, the external screw thread box cupling, and two ends that the two is welded on the oil pipe body are respectively then constituted " non-threaded connection welded type box cupling connects oil pipe ".

The utility model compared with prior art has material and the parameter that can adjust oil pipe body and box cupling neatly, in general, its comprehensive mechanical performance of steel that the production box cupling is used mainly is better than the oil pipe body, so just can bring into play the performance of material to greatest extent, in general can reduce material consumption 25%--45%, oil pipe cost to equal length and free air space reduces 20-40%, therefore adopt the utility model can save a large amount of buying oil pipe funds, simultaneously because alleviating of oil pipe weight also can reduce the running cost in the oil field operation process.

Fig. 1 is an oil well with non-threaded connection coupling type oil pipe overall structure schematic diagram, and 1 is expanded joint internal thread box cupling among the figure, the 2nd, and expanded joint box cupling oil pipe body.The 3rd, expanded joint external screw thread box cupling, the 4th, expanded joint groove, the 5th, oil pipe body end flange.

Fig. 2 is that oil well welds coupling type oil pipe connection diagram with non-threaded connection, and 6 is that the internal thread box cupling is used in welding among the figure, the 7th, and welding box cupling oil pipe body, the 8th, welding external screw thread box cupling.

Below in conjunction with accompanying drawing embodiment is described: buy material requested from market by designing requirement, then carry out the making of component by accompanying drawing, make an end expanded joint of the expanded joint internal thread box cupling (1) that is provided with 2-5 expanded joint groove in the box cupling and expanded joint box cupling oil pipe body (2) by Fig. 1, the in addition end of its oil pipe body (2) with in establish 2-5 expanded joint groove expanded joint external screw thread box cupling (3) expanded joint then constitute oil well with the non-threaded coupling type oil pipe that is connected together, in the expanded joint process, tubing coupling and oil pipe body expanded joint portion produce certain plastic strain, part oil pipe base metal plasticity flow into to expand and to press in the groove, and oil pipe body end also flange is rolled into box cupling and gives in the expanded joint groove that stays; Also can will weld the end that internal thread box cupling (6) is welded on welding box cupling oil pipe body (7) by Fig. 2, the in addition end and the welding external screw thread box cupling (8) of its oil pipe (7) welds together and then constitutes oil well and weld the coupling type oil pipe with non-threaded the connection.

Claims

1, the oil well used of a kind of oil field oil recovery, gas production, test, de-plugging, pressure break, acidifying underground work is characterized in that with non-threaded connection coupling type oil pipe:

A, by an end expanded joint of the expanded joint internal thread box cupling (1) that is provided with 2-5 expanded joint groove in the box cupling and expanded joint box cupling oil pipe body (2), the end in addition of its oil pipe body (2) equally with in establish 2-5 expanded joint groove expanded joint external screw thread box cupling (3) expanded joint constitute oil well with the non-threaded coupling type oil pipe that is connected together;

B will weld the end that internal thread box cupling (6) is welded on welding box cupling oil pipe body (7), and the in addition end and the welding external screw thread box cupling (8) of its oil pipe body (7) welds together and then constitute oil well and weld the coupling type oil pipe with non-threaded the connection.