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Pyrotechnic composition for thermal pipe cutter and process for making same

A production process and technology of pyrotechnics, applied in wellbore/well components, earthwork drilling and production, etc., to achieve the effect of convenient transportation and safe use

Inactive Publication Date: 2004-11-10
台州盛世环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, there is no pyrotechnic agent dedicated to the eager pipe cutter.

Method used

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  • Pyrotechnic composition for thermal pipe cutter and process for making same
  • Pyrotechnic composition for thermal pipe cutter and process for making same
  • Pyrotechnic composition for thermal pipe cutter and process for making same

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Embodiment Construction

[0027] First, mix 100 grams of aluminum powder and 300 grams of ferric oxide to make 400 grams of thermite. The thermite was mixed with 100 grams of gas forming agent. In this embodiment, the gas-forming agent is selected from nitrocellulose. This gives a powdery mixture. Then this mixture is put into the mold and pressed into a columnar body with an inner hole 13 in the center, that is, the pyrotechnic agent outer layer 11, such as figure 2 shown. Finally, the above-mentioned mixture that has not been compressed is loaded into the inner hole to become the pyrotechnic inner layer 12 .

[0028] like figure 1 and figure 2 As shown, in this embodiment, the density of the outer layer 11 of the pyrotechnic agent is relatively large, at 3.6g / cm 3 about. The density of the inner layer 12 is relatively small, at 1.7g / cm 3 about.

[0029] like figure 2 As shown, the cross-sectional shape of the pyrotechnic charge inner hole 13 is star-shaped. This is beneficial to increas...

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Abstract

The invention provides a pyrotechnic agent of thermal pipe cutter and its producing technique. It is basically composed of thermite and gas-forming agent in weight percents of 70%-90% and 5%-30%, respectively. The thermite is composed of Al and Fe2O3, and the gas-forming agent is mixture of potassium permanganate and activated carbon, teflon or nitrocotton. The thermite reacts and produces high temperature and the gas-forming agent is decomposed into gas stage product all with this, thus forming the inner pressure for spraying fused metal flow. Its producing technique: firstly mix the thermite and gas-forming agent uniformly; then putting the mixture in a mould for compression molding to make a columnar body with a hole in the center, namely the outer layer of the pyrotechnic agent; finally, placing the mixture of thermite and gas-forming agent in the central hole, which is the inner layer, and making the inner-layer density less than the outer-layer density. Its advantages: use safety and transporting convenience.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a pyrotechnic agent used for a hot pipe cutter and a production process thereof. Background technique [0002] During the drilling and recovery of oil and gas wells, geothermal wells, coalbed methane wells and water wells, pipes such as drill pipes, tubing, casings and packers are often stuck due to mechanical failure, poor downhole conditions and human errors, causing stuck pipes ACCIDENT. With the increase of inclined wells and directional wells with an angle greater than 42 degrees, pipe stuck accidents also increased significantly. In the Gulf of Mexico, pipe stuck accidents in directional wells account for about 91%. [0003] When a stuck tube accident occurs, the tube needs to be separated. The existing methods for separating pipe fittings include: explosive loosening, chemical pipe cutting and energy-concentrating pipe cutting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B29/02E21B31/00
Inventor 阮卜琴林西华刘晋仁廖政权戴文祥董永吉
Owner 台州盛世环境工程有限公司
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