Measuring method of liquid full pressure gradient-flow relation in low-permeability reservoir

Abstract

The invention provides a measuring method of the liquid full pressure gradient-flow relation in a low-permeability reservoir. The measuring method includes the steps that 1, a thin glass tube communicator device is adopted for measuring the static starting pressure gradient in a low-permeability rock core; 2, a multifunctional rock core displacement device is adopted for measuring the steady state pressure gradient-flow relation; 3, the starting pressure gradient, obtained through the static method, of the low-permeability rock core and the steady state pressure gradient-flow data obtained through measurement by the steady-state method are drawn in the same graph, and then the liquid flowing full pressure gradient-flow relation of the low-permeability rock core is obtained. By means of the measuring method of the liquid full pressure gradient-flow relation in the low-permeability reservoir, the starting pressure of the low-permeability rock core can be measured accurately, the liquid flowing pressure gradient-flow relation can be obtained on the basis of the full pressure gradient, and the obtained flow characteristics of the low-permeability rock core are more accurate and can be used for flowing characteristics description of the low-permeability reservoir.

Description

technical field [0001] The invention relates to the technical field of oilfield development tests, in particular to a method for measuring the relationship between liquid total pressure gradient and flow rate in low-permeability oil reservoirs. Background technique [0002] In the development of oil and gas reservoirs, with the depletion of conventional medium and high permeability reservoir resources, more and more low-permeability and ultra-low-permeability reservoirs have been put into development. This year, more tight oil and gas reservoirs and shale gas reservoirs have begun to invest mining. The common feature of this kind of reservoirs is low permeability and great difficulty in development. The current accepted concept is that a reservoir with a permeability of less than 50 mD is called a low-permeability reservoir. Studies have shown that there is a start-up pressure when the liquid flows in low-permeability reservoirs, and the existence of start-up pressure cause...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a device that can overcome the problem that the current traditional multifunctional rock core displacement device cannot accurately measure the starting pressure of the rock core, and cannot describe the relationship between the total pressure gradient and the flow rate of the low-permeability reservoir, and can accurately measure A Method for Total Pressure Gradient-Flow Rate Relationship of Low Permeability Core

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