Natural gas well shaft leakage three-dimensional leaking stoppage method and test device thereof

Abstract

The invention provides a natural gas well shaft leakage three-dimensional leaking stoppage method and a test device thereof. According to the leaking stoppage method, PPS polymer gel, T&TS liquid, soft elastic and high-filtration water loss slurry leaking stoppage materials, ultra-low permeability micro-foam and other technical materials are developed and application, many shaft leakage technicalproblems can be solved, and the test device comprises a core clamping device. The front end of the core clamping device is connected with a constant flow / pressure pump through an intermediate container, the rear end of the core clamping device is connected with a gas bottle sequentially through a flowmeter and a back-pressure valve, the intermediate container and the core clamping device are arranged in a heating system, the core clamping device is connected with a confining pressure system, the front end of the core clamping device is provided with a first pressure sensor, the rear end of thecore clamping device is provided with a second pressure sensor, the first pressure sensor and the second pressure sensor are connected with a data collection system, and the front end and the rear end of the core clamping device are connected through a bypass pipeline with a first manual valve. The leaking stoppage effect of NZ slurry can be intuitively watched and verified.

Description

technical field [0001] The invention specifically relates to a three-dimensional plugging method and a test device for wellbore leakage of natural gas wells. Background technique [0002] When the wellbore of a natural gas well is exploiting natural gas, it usually encounters lost circulation, and most of the lost circulation is caused by fractures in the formation. Usually, it is only necessary to block the cracks when plugging, but the existing crack plugging agent effect Not very good, and the plugging effect cannot be seen intuitively, and there is also a lack of such a test device. Contents of the invention [0003] In order to solve the above problems, the present invention provides a three-dimensional lost circulation plugging method and a test device for the wellbore of a natural gas well. [0004] It adopts technical scheme as follows: [0005] A three-dimensional plugging method for wellbore lost circulation of natural gas wells, when the lost circulation veloc...

AI Technical Summary

Problems solved by technology

[0002] When the wellbore of a natural gas well is exploiting natural gas, it usually encounters lost circulation, and most of the lost circulation is caused by fractures in the formation. Usually, it is only necessary to block the cracks when plugging, but the existing crack plugging agent effect Not very good, and the plugging effect cannot be seen intuitively, and there is also a lack of such a test device

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