Device and method capable of simultaneously performing multi-rock-sample low-speed non-Darcy flow tests and measurement

Abstract

The invention discloses a device and method capable of simultaneously performing multi-rock-sample low-speed non-Darcy flow tests and measurement. The device comprises a liquid storage tank, a constant-temperature control mechanism, a plurality of core measuring mechanisms, a confining pressure applying mechanism and a data collecting mechanism and is characterized in that the liquid storage tankis used for providing working liquid, the constant-temperature control mechanism is used for providing constant temperature required by the tests, the core measuring mechanisms are used for measuringthe low-speed non-Darcy flow conditions of various core samples, the confining pressure applying mechanism is used for providing confining pressure required by the tests, and the data collecting mechanism is used for collecting data. The device is simple in structure and capable of researching and carrying out the low-speed non-Darcy flow tests of multiple rock samples and researching a low-speednon-Darcy effect. The method based on the device is convenient to operate and high in measuring accuracy and precision.

Description

technical field [0001] The invention relates to the technical field of tight reservoir seepage research, in particular to a device and method for simultaneous measurement of multiple groups of rock samples in low-velocity non-Darcy seepage tests. Background technique [0002] my country is rich in tight oil reserves and has great potential for exploration and development. However, tight oil reservoirs are dense, with widely developed micro-nano pores, and have obvious low-velocity seepage characteristics under low pressure gradients, which accurately describe the low-velocity non-Darcy seepage law of tight oil It is of great significance to the effective development of tight oil. [0003] Previous studies have shown that when the displacement pressure gradient is less than a certain critical value, the pores of tight oil reservoirs are completely filled by the immobile fluid boundary layer, and the fluid cannot flow. It is the so-called true threshold pressure gradient. As t...

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Problems solved by technology

[0004] At present, there are many methods for studying low-velocity non-Darcy in many core laboratories, such as "capillary balance method", "bubble method" and "pressure difference-flow method". However, the difficulties of using these methods to study low-velocity non-Darcy flow are as follows: 1. The "capillary balance method" and "bubble method" require extremely low upstream displacement pressure and extremely small displacement flow rate, and are not suitable for ultra-low permeability core start-up pressure testing; 2. However, when measured by the conventional differential pressure flow method, Only a single core can be used for the experiment, which takes a long time and is inefficient; 3. The displacement flow measurement is complicated; 4. The equipment accuracy is extremely high and the experiment takes too long

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