Full-bore straddled downward returning perforation-test combination pipe column and operation method thereof

Abstract

The invention provides an efficient and reliable full-bore straddled downward returning perforation-test combination pipe column and an operation method thereof based on a condition that a perforatedwell section exists above an oil reservoir to be tested. In the pipe column, on the precondition of retaining a pressure relief chamber, a drop bar ignition mode and a parallel explosion propagation type pressure time delay ignition mode are simultaneously arranged 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 and the like can be eliminated, damage of in-the-pit instruments can be prevented, and perforation and test successrates can be improved; via the pipe column disclosed in the technical solution, a perforated reservoir can be straddled; integrated operation of perforating, testing, draining, and reservoir reformingof the reservoir to be tested below the perforated reservoir can be performed; construction processes can be simplified, labor intensity can be lowered, an oil test construction cycle can be shortened, and construction efficiency and success rates can be improved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development oil testing, in particular to a full-diameter spanning back-perforating-testing combined pipe string and an operating method thereof. Background technique [0002] The utility model of Chinese patent application No. 200520106208.8 discloses a kind of tubing string integrated with reverse perforation-testing and drainage under the span, and its purpose is to provide a The disadvantages of the rapid return test tubing string are as follows: First, the internal pressure transmission pipe passes through the slip packer, which cannot realize full bore, cannot adopt the method of throwing rods to ignite, and cannot carry out formation testing and reservoir testing. Transformation, rope and other multi-process operations; the second is that only one pressure ignition head is installed on the pipe string. In case of failure of the ignition head, the pipe string can only be pu...

AI Technical Summary

Problems solved by technology

[0002] The utility model of Chinese patent application No. 200520106208.8 discloses a kind of tubing string integrated with reverse perforation-testing and drainage under the span, and its purpose is to provide a The disadvantages of the rapid return test tubing string are as follows: First, the internal pressure transmission pipe passes through the slip packer, which cannot realize full bore, cannot adopt the method of throwing rods to ignite, and cannot carry out formation testing and reservoir testing. Transformation, rope and other multi-process operations; second, only one pressure ignition head is installed on the pipe string. In case of failure of the ignition head, only the pipe string can be pulled out.

[0003] The utility model of Chinese patent application No. 201520281072.8 discloses a combined operation string for perforating and testing by back-throwing rods under the span. , if the perforating gun is not detonated, the rod can only be fished out with a cable or a suction rope salvage device, find out the cause, deal with the problem, and cast the rod again

Due to the low success rate of rod throwing in deep wells or highly inclined wells, and the high cost of construction and drilling rig man-hours in areas with harsh conditions such as oceans and deserts, salvage is time-consuming and laborious. The downhole pipe string was pulled out for rework, which delayed the construction time

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