Non-steady state detection device and non-steady state detection method for permeability of low-permeability rock

A technology for measuring device and permeability, which is applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc. Simple operation and guaranteed accuracy

Active Publication Date: 2014-03-05
PETROCHINA CO LTD
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Problems solved by technology

However, when using such a measuring device and method to measure low-permeability core samples (permeability <0.1mD), because the rock has low porosity and poor connectivit

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  • Non-steady state detection device and non-steady state detection method for permeability of low-permeability rock
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  • Non-steady state detection device and non-steady state detection method for permeability of low-permeability rock

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[0028] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0029] Such as figure 1 As shown, the present invention proposes a low-permeability rock permeability unsteady-state measuring device 100, the measuring device 100 includes a core holder 1 for accommodating a core sample, the side wall of the core holder 1 It is connected to the ring pressure pump 2 by a pipeline; the inlet end of the core holder 1 is provided with an inlet pipeline 3, and the outlet end is provided with an outlet pipeline 4; the inlet pipeline 3 is sequentially provided with an inlet pressure sensor 31. Intake valve 32, pressure regulating valve 33 and cylinder 34; outlet pressure sensor 41 and vent valve 42 are arranged in sequence in the outlet pipeline 4; in the inlet pipeline 3 and located in the core holder...

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Abstract

The invention discloses a non-steady state detection device and a non-steady state detection method for permeability of low-permeability rock. The detection device comprises a rock core holder for holding a rock core sample, wherein the side wall of the holder is connected to an annular pressure pump; the holder is provided with an inlet pipeline and an outlet pipeline; an inlet buffering container is arranged in the inlet pipeline; an outlet buffering container is arranged in the outlet pipeline; a check loop is connected to the holder in parallel; a check cylinder is arranged in the check loop. Due to the adoption of the non-steady state detection device for the permeability of the low-permeability rock, the permeability of the low-permeability rock core can be detected quickly and accurately; the permeability of the low-permeability rock core sample can be detected through two non-steady state detection methods; the device is simple to operate, accurate to test and capable of adjusting the volume of the inlet and outlet buffering containers according to a porosity of the rock core so as to ensure the detection precision of the permeability.

Description

technical field [0001] The invention relates to a device and method for measuring the permeability of low-permeability rocks such as tight sandstone, coal rock, mudstone, and shale in laboratories in the fields of petroleum, geology, and mining, and particularly relates to an unsteady-state measurement of the permeability of low-permeability rocks Devices and methods. Background technique [0002] At present, a series of progress has been made in the exploration and development of tight sandstone gas, shale gas, coalbed methane and other low-permeability gas reservoirs, and permeability has become one of the key parameters for evaluating low-permeability reservoirs. The existing laboratory core permeability measurement adopts the steady-state method. The basic principle is based on Darcy's law (the permeability test of rocks with a permeability greater than 0.1mD is mainly based on Darcy's law), measuring the fluid flow through the core under a certain pressure. Permeabilit...

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Application Information

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IPC IPC(8): G01N15/08
Inventor 范俊佳柳少波姜林田华宋岩赵孟军方世虎洪峰马行陟樊阳
Owner PETROCHINA CO LTD
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