Two-layer delamination perforation-delamination test combined pipe string in one trip and its operation method

Abstract

The invention relates to a one-trip string two-layer layering perforation-layering testing combining tubular column and an operation method. The tubular column comprises a first oil tube, a depth correction short joint, a second oil tube, a circulating valve, a third oil tube, a testing valve assembly, a second pressure gauge supporting cylinder, a second pressure transfer joint, a straddle packer, a second sieve tube, a spacer tube, a pressure guiding joint, a second ignition head, a second perforating gun, a pressure release device, sealing layer well shut-in sampling valve, a damping pressure gauge supporting cylinder, a first pressure transfer joint, an anchor packer, a first sieve tube, a shock absorber, a fourth oil tube, a first ignition head, a first perforating gun, a pressure relieving device, a second inner pressure transfer tube, a first pressure transfer tube and a first outer pressure transfer tube. The sealing layer well shut-in sampling valve is located between the second perforating gun and the anchor packer. The damping pressure gauge supporting cylinder is located below the sealing layer well shut-in sampling valve. by adopting the tubular column, two-layer layering perforation and layering testing combination can be completed, final well shut-in of the first layer does not need to occupy the operation machine time independently, down-hole sampling is convenient, and the tubular column has the advantages of being short in period, low in cost and the like.

Description

technical field [0001] The invention relates to an oil and gas well two-layer perforation, testing pipe string and its operation method, in particular to a pipe string two-layer delamination perforation-delamination testing joint operation pipe string and its operation method. Background technique [0002] In test oil and gas wells, for the realization of perforation test technology in multi-layer operation, layered multi-pass perforation test is generally adopted, or multi-layer mixed test is performed after simultaneous perforation of several adjacent formations by one string Way. The disadvantage of multi-pass perforation test method is that the strings are lifted and lowered multiple times, resulting in long perforation test cycle, slow speed, high cost, and easy pollution to oil and gas layers; The production capacity, fluidity, pressure recovery curve and other data of the small layer affect the conclusion of oil testing and the accurate characterization of the reserv...

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the multi-pass string perforation test method described in the background technology, there are disadvantages such as long period, slow speed, high cost, and the difficulty in recording the production capacity, fluidity, and pressure recovery curve data of each small layer in the multi-layer perforation test method, and the existing There are problems such as "one string multi-layer layered perforation-separate measurement string" can not save the final shut-in time of the first layer test, the purpose of the present invention is to provide a two-layer layered perforation- The combined operation of the layered test string can realize the layered perforation of two layers and the combined operation of the layered test with one trip of the string, which has the outstanding advantages of short construction period and low cost

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