Perforation ignition system, perforation-test-acidification combination pipe column and usage method thereof

Abstract

The invention provides a perforation ignition system comprising a drop bar ignition head and a parallel explosion propagation type pressure time delay ignition head. The perforation ignition system can be applied to a test combination pipe column of an in-the-pit perforation. On the precondition of retaining a pressure relief chamber, two ignition modes comprising a drop bar ignition mode and a pressure time delay ignition mode are set at the same time above a perforating gun. When drop bar ignition is unsuccessful, pressurization ignition in the pipe column can be directly adopted, complicated operations such as drop bar salvaging after failure of drop bar ignition can be eliminated, and pipe column vibration and damage of in-the-pit instruments can be alleviated; effects of lowering labor intensity, shortening oil test construction cycles and improving construction efficiency and success rates can be achieved; the invention also provides a perforation-test-acidification combination pipe column adopting the above ignition system and a usage method thereof; combination of perforation, a test, acidification and a post-acidification test can be realized; via comparison between the test before the acidification and the test after the acidification, acidification effects can be known accurately and directly, and accurate evaluation of a reservoir stratum can be facilitated.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development oil testing, in particular to a perforation ignition system, a combined perforation-test-acidification string and a use method thereof. Background technique [0002] In oil and gas well deep well perforation-test joint operation and spanning back perforation-test joint operation, the string tremor and high pressure shock generated at the moment of perforation are more damaging to the pipe string and downhole instruments than conventional shallow well perforation-test The combined operation is much more serious, and even causes the pipe string to break and the tool to fall into the well. Therefore, how to improve the success rate of perforation and protect the safety of downhole strings and instruments is very important when carrying out the above-mentioned similar construction operations. [0003] At present, in oil and gas well perforation-testing joint operation an...

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Problems solved by technology

[0003] At present, in oil and gas well perforation-testing joint operation and spanning perforation-testing joint process, the perforating gun is usually detonated by rod-throwing ignition, pressure ignition or double detonation TCP. The advantages of rod-throwing ignition are simple operation, The cost is low, but the disadvantage is that when the rod does not ignite, the rod must be pulled out to avoid misperforation or injury when the string is lifted; the double detonation TCP is to improve the perforation success rate of deep wells or offshore oil fields. The upper and lower ends of the perforating gun are respectively equipped with a rod ignition head and a pressure ignition head. When the pressure and detonation delay ignition head in the drill pipe is unsuccessful, the rod with a roller is thrown again to detonate the rod ignition head. The perforation success rate is doubled. The disadvantage is that although the perforation success rate is improved after the ignition head is installed at the upper and lower ends of the perforating gun, the pressure release device and the pressure relief chamber cannot be installed on the pipe string. Conducive to deep well perforation-testing joint operation and spanning perforation-testing joint operation to slow down string vibration and protect the safety of downhole instruments and meters

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