Water-pressure-caused plugging drill hole water pressing test method

Abstract

The invention provides a water-pressure-caused plugging drill hole water pressing test method. The method includes the following steps of 1, hole forming; 2, mounting; 3, placement; 4, plugging causing; 5, water injection; 6, conduction of a water pressing test; 7, closing of pressure relief; 8, completing of the test. By means of the method, detection work efficiency is improved, after a hole is drilled, the test on the hole is conducted continuously at a time, and the test time of each hole segment is less than 1 hour; survey precision is improved, the plugging causing pressure is sufficient, the pressure maintaining effect is good, and the test precision is two times higher than that of a drilling machine water pressing test; the hole clamping accident rate is low, only one water pipe is adopted for a whole probe, no oil pipe exists, few accessories of the probe exist, site operation is facilitated, and hole clamping accidents are reduced.

Description

technical field [0001] The invention relates to a water pressure test method for hydraulic plugging drilling, which belongs to the technical field of engineering construction detection. Background technique [0002] Borehole pressure water test is a commonly used method for geological exploration and underground engineering construction testing. The working method is to artificially install two plugs at a certain depth of the borehole, and then inject high-pressure water into them. When the pressure balance is reached, record on the surface. Injection flow rate, pressure and pressure stabilization time, and finally these recorded data are substituted into the corresponding calculation formula of borehole pressure water test to calculate the leakage coefficient of the test section. [0003] There are many kinds of pressure water test methods mainly due to the different ways of plugging. The conventional drilling pressure water test probe is integrated with the drilling rig. T...

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Problems solved by technology

[0003] There are many kinds of pressure water test methods mainly due to the different ways of plugging. The conventional drilling pressure water test probe is integrated with the drilling rig. There are two types of single plug and double plug. Both of them are plugged on the drill pipe. The cavity in the drill pipe injects water into the plug cavity. This method is generally carried out during the drilling construction process. Because the construction needs to be interrupted, a

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