A general-purpose drug-type cover for oil and gas well perforating bullets for oil and gas wells and its preparation method

Abstract

The invention discloses a general-purpose drug-shaped cover for oil pipe perforating bombs used in oil and gas wells and a preparation method. The drug-shaped cover includes a drug-shaped cover body, the drug-shaped cover body is in the shape of an arc surface, and the drug-shaped cover body has an outer arc The end of the surface is in the shape of a straight cylinder, and the body of the arc-shaped medicine cover is composed of an outer arc surface, an inner arc surface, a straight cylinder surface and an end surface, and the outer arc surface is connected with the inner arc surface through the straight cylinder surface and the end surface in turn. Form the drug-shaped cover body. Applying the medicine-shaped cover of the present invention to the perforating projectile, the large-diameter jet can be formed after the perforating projectile explodes, ensuring the regularity of the energy-shaping penetrating body and the consistency of the jet flow gradient, and at the same time realizing the smoothness of the outer casing of the tubing. Zero damage and low damage.

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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