General linear used for oil pipe perforating bullet in oil-gas well and preparation method of linear

Abstract

The invention discloses a general linear used for an oil pipe perforating bullet in an oil-gas well and a preparation method of the linear. The linear comprises a linear body, wherein the linear body is shaped like an arc surface, the end portion of an outer arc surface of the linear body is shaped like a straight cylindrical surface, the linear body shaped like the arc surface is composed of the outer arc surface, an inner arc surface, the straight cylindrical surface and an end surface, and the outer arc surface is connected with the inner arc surface through the straight cylindrical surface and the end surface to form the linear body. The linear is applied to the perforating bullet, the perforating bullet can form a large-diameter jet flow after being blasted, regularity of an energy-gathered penetration body and consistency of jet flow gradients are guaranteed, and zero damage and low damage of an outer layer sleeve pipe of an oil pipe are simultaneously achieved.

Description

technical field [0001] The invention relates to a general-purpose oil pipe perforating bullet for oil and gas wells and a preparation method thereof, which is suitable for the perforating bullet for realizing the perforation of oil pipes in the exploration and development process of oil and gas wells. Background technique [0002] In recent years, with the rapid development of domestic oil and gas field exploitation, the intensification of exploration and development and the increasingly complex formations to be drilled, engineering accidents such as pipe sticking, blockage, and lost circulation often occur. When dealing with such accidents, it is necessary to use perforating bombs to perforate the drill pipe, tubing or casing, so as to quickly establish a circulation channel, and achieve the purpose of quick release of the drill pipe, well killing and plugging, etc. emergency construction. [0003] However, the currently commonly used perforating bombs are used for differen...

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Problems solved by technology

[0003] However, the currently commonly used perforating bombs are used for different well conditions of tubing and casing combinations. In order to avoid damage to the casing when penetrating the tubing, it is necessary to use different structures of drug covers, materials, formulas and explosives. In addition, the perforation bullets commonly used in China have smaller perforation apertures. In order to achieve better results, it is often necessary to increase the amount of construction work.

[0004] In the prior art, Chinese Patent No. "201310192538.2" announced a copper-based composite material for a drug-type cover and its preparation method. The manufacturing method adopts cold rolling, and the surface treatment adopts polishing and grinding. The drug-type prepared by this method The internal stress inside the cover is large, and it is difficult to treat the surface of the small-caliber drug cover; another example is the Chinese patent number "201210420296.3" which announces a preparation method for the perforating ammunition cover, which uses the infiltration method to make the tungsten-copper composite drug form The cover is protected by hydrogen gas during the sintering process, but in the usual production process of powder metallurgy parts, it is inevitable that there will be some oxidation on the surface, and there will be dislocation between the oxidized surface and the combined tungsten copper material in the subsequent finishing process. Defects in the oxidation site, which affect the consistency of the formed jet

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