A double-sealed spanning test string

Abstract

The invention relates to a double-sealed spanning test pipe string, which includes a screen tube 1 corresponding to the first formation and a screen tube 2 corresponding to the second formation. The pressure gauge support cylinder 1 is screwed under the screen tube 1. A slip packer, a lifting nipple 1 and a wire plug are sequentially arranged above the screen pipe 1, and the upper end of the wire plug is connected to the bottom of the screen pipe 2 through an adjustment nipple, and the screen pipe 2 is connected upwardly with pressure gauge support cylinder 2, Straddle packer, lifting sub two, mechanical lock, tester, lifting sub three and circulation valve. The straddle packer includes a bypass mechanism, a setting mechanism is arranged under the bypass mechanism, a shear pin mechanism is arranged under the setting mechanism, and a transposition mechanism for controlling bypass and setting is arranged under the shear pin mechanism. The double-seal spanning test pipe string of the present invention can continuously test two well sections in sequence, greatly shortens the test time, improves the test efficiency, and has high test accuracy. During the downhole process, it is ensured that the straddle packer will not be set in advance to improve the success rate of the straddle test.

Description

technical field [0001] The invention relates to an instrument for downhole testing, in particular to a double-seal spanning testing string, which belongs to the technical field of petroleum and natural gas testing. Background technique [0002] In the process of oil exploration, oil, gas and water layers can be preliminarily determined through cuttings logging, gas logging, core analysis and electrical logging interpretation data, but they need to be verified by oil testing in the end. Formation testing, also known as drill string testing, is a key link in scientific oil testing. It plays an important role in determining reservoir productivity, fluidity, energy, and reservoir seepage characteristics and parameters, and can provide reliable data for further exploration and development of blocks. Detailed basis. [0003] Before formation testing, the test well section is perforated, that is, the perforating gun is lowered to the test well section, and the casing of the well s...

AI Technical Summary

Problems solved by technology

[0005] Since the cement plug needs to be accurately injected into the downhole cement slurry, it needs to wait for 48 hours for solidification after the grouting is completed, and the sealing performance must be verified after solidification; after the test is completed, the drilling tool must be lowered to drill the cement plug, so that the time required to complete the two-layer test is relatively short. Long, low test efficiency, and many processes, high risk

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