Well completing test pipe column and method for gas well

Abstract

The invention provides a well completing test pipe column and method for a gas well. The pipe column comprises an oil pipe, a packer arranged on the outer wall of the oil pipe, a leak-proof device arranged at the tail end of the oil pipe and used for preventing well killing fluid in the oil pipe from leaking, and a pressure gauge arranged in an inner cavity of the leak-proof device or an inner cavity of the oil pipe. By using the pipe column, it can be ensured that gas well test and completing can be completed through one time of tripping in, it also can be ensured that the underground pressure gauge can be safely taken out, so that the pipe column can be effectively applied to the completing test of the gas well and is particularly suitable for a high-pressure gas well, the huge operationcost and the operation risk caused by operation on the pipe column are avoided, and the reliability of the pipe column is improved.

Description

technical field [0001] The invention belongs to the technical field of well completion and testing in petroleum engineering, and in particular relates to a well completion testing string and a method for gas wells. Background technique [0002] Gas wells need to use pressure gauges to test downhole pressure data during well testing to obtain formation physical properties, reserves and other parameters. In low-pressure gas wells (generally no more than 35MPa), steel wire or cable can be used for hoisting measurement, that is, steel wire or cable or coiled tubing is used to send the pressure gauge into the downhole through the tubing, and the pressure gauge is taken out after the pressure data is measured downhole. Due to the low pressure, the wellhead can be sealed during tripping by wire or cable or coiled tubing. [0003] However, in high-pressure gas wells (generally higher than 35MPa), it is difficult to ensure the wellhead seal of steel wire or cable or coiled tubing, s...

AI Technical Summary

Problems solved by technology

High-pressure gas wells must be killed when tripping the pipe string, and a large amount of well killing fluid will be lost when the well is killed, and the well pressure cannot be stabilized. You can only strive for a working window to trip the pipe string, and the risk of well control is extremely high

Moreover, separating the testing and completion strings will increase a lot of operating costs and risks, and since the testing string must be pulled out after the test is completed, it is required to use a removable packer for the test, but under high temperature and high pressure, the removable packer The reliability of the packer is not as good as that of the permanent packer, resulting in a greatly increased risk of test failure

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