Experimental probe for measuring physical rock parameters of water saturated mudstone under high-pressure drainage condition

Abstract

An experimental probe for measuring physical rock parameters of water saturated mudstone under a high-pressure drainage condition adopts the technical scheme as follows: a hole is formed in the center of the upper end face of a probe base; a groove is formed in the bottom surface of the probe base and corresponds to the hole in position, the diameter of the groove is larger than that of the hole, and the groove is communicated with the hole; one end of a high-pressure resistant drainage rod is inserted and fixed in the hole, a supporting pad is mounted in the groove and is clung to the end inserted in the hole, of the high-pressure resistance drainage rod; a filter net is arranged under the supporting pad; a filter net threaded cover plate is arranged on the bottom surface of the groove, the supporting pad and the filter net are connected through screw extrusion of the filter net threaded cover plate; holes are formed in centers of the supporting pad and the filter net threaded cover plate, the diameters of the holes are equal to the inner diameter of the high-pressure resistant drainage rod, and the supporting pad, the filter net threaded cover plate and the inner diameter of the high-pressure resistant drainage rod are positioned on one line.

Description

technical field [0001] The invention relates to an experimental probe capable of measuring physical property parameters of saturated cement rock under high-pressure drainage conditions. Background technique [0002] Underground mudstone formations not only act as cap rocks for resources such as oil, gas, and water, but also often serve as reservoirs for these resources. Therefore, it is very important to study the physical properties of mudstones containing fluids. However, the current probe used in the laboratory to measure the physical parameters of saturated fluid rock under high-pressure drainage conditions can only measure dry mudstone or gas-bearing mudstone. If the physical parameters of saturated cement rock are measured under high-pressure drainage conditions, the following problems will be encountered: [0003] One is that the shale content of the mudstone sample is too high. When the high-pressure test is carried out after being saturated with water, it will enter...

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Problems solved by technology

[0003] One is that the shale content of the mudstone sample is too high. When the high-pressure test is carried out after being saturated with water, it will enter the test pipe from the probe drainage pipe due to high pressure extrusion, resulting in serious blockage of the probe drain pipe and the test pipe, and it is very difficult to clean , and even need to replace new probes and experimental pipelines, resulting in serious waste;

[0004] The second is that too much mud will be squeezed into the pipe, which will completely deform the sample. After one experiment is completed, the sample will be invalid, and no further measurement and research can be carried out on it.

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