Straddle perforating and testing combining string capable of firstly testing lower layer and operation method thereof

Abstract

Provided is a straddle perforating and testing combining string capable of firstly testing a lower layer and an operation method thereof. The combining string comprises a first oil tube, a depth correction short section, a second oil tube, a circulating valve, a third oil tube, a testing valve assembly, a second pressure meter supporting tube, a pressure transfer connector, a straddle packer, a screening tube connector, a spacer tube, a pressure guide connector, an ignition head, a perforating gun, a pressure release device, a sealing layer shut-in valve, a slip packer, a fourth oil tube, a damping pressure meter supporting tube, a first screening tube, an inner pressure transfer tube and an outer pressure transfer tube; the sealing layer shut-in valve is located between the perforating gun and the slip packer, the damping pressure meter supporting tube is located below the sealing layer shut-in valve, and the two ends of the outer pressure transfer tube are connected to the pressure guide connector and an outer pressure transfer tube inlet of the sealing layer shut-in valve. By means of the string, a perforated layer below the lower packer can be tested firstly, and then straddle perforating and testing combining construction is conducted on an un-perforated layer between the two packers, so that final shut-in of the first layer do not need to occupy the time of an operation machine separately; the advantages of being short in period, low in cost and the like are achieved.

Description

technical field [0001] The invention relates to an oil and gas well spanning perforation-testing combined pipe string and its operation method, in particular to a cross-interval perforation-test combined pipe string and its operation method that can first measure the lower layer. Background technique [0002] In terms of cross-interval perforation-test joint operation technology for oil and gas wells, the oil testing techniques closest to the present invention include "oil and gas well cross-section perforation-test joint construction pipe string device" and "span perforation-test joint operation" "Construction Column" [0003] "Oil and gas well spanning perforation-test joint construction pipe string device" (patent application No. 97229886.X) is a pipe string structure with a perforating gun sandwiched between two-stage packers, which realizes the use of a single trip downhole pipe string. It can realize the integrated operation method of first crossing and isolating the ...

AI Technical Summary

Problems solved by technology

However, both of them have the following disadvantages: one string can only perforate and test the formation between the two packers, and it cannot be realized that the drilled layer below the lower packer can be perforated in one string. After the test, the unperforated layer between the two packers will be combined with perforation-test construction

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