System and method for testing resistance coefficient of heterogeneous viscoelastic particle solution for oil displacement

Abstract

The invention discloses a system for testing the resistance coefficient of a heterogeneous viscoelastic particle solution for oil displacement. Apressure experiment cavity comprises a sleeve and a pressing rod; the sleeve and the pressing rod are axially matched in the sleeve to form a simulation experiment cavity; the simulation experiment cavity is internally provided with an experiment liquid accommodating region and a capillary tube region for simulating an experiment stratum, the capillary tube region is internally provided with a plurality of capillary tubes and a rubber ring for fixingthe capillary tubes and sealing gaps between the capillary tubes and the wall of the sleeve, and one end of the sleeve is provided with a flowing channel communicated with the outside. The method comprises the following steps: pouring simulated formation water and a heterogeneous viscoelastic particle solution prepared from the simulated formation water into thesleeve; and enabling the pressure rod to press the solution through the capillary tubes, and respectively recording the pressures of the simulated formation water and the heterogeneous viscoelastic particle solution prepared from the simulated formation water when the heterogeneous viscoelastic particle solution passes through the capillary tube for balancing, so that the resistance coefficient of the heterogeneous viscoelastic particle solution can be obtained, the experimental result repeatability is good, the test time is short, and the efficiency is high.

Description

technical field [0001] The invention discloses a resistance coefficient test system and a test method of heterogeneous viscoelastic particle solution for oil displacement, belonging to the technical field of tertiary oil recovery chemical flooding. Background technique [0002] Heterogeneous composite oil displacement is to add polymer polyacrylamide, viscoelastic particle oil displacement agent and surfactant to the injected water, increase the viscosity of injected water and reduce oil Water mobility ratio, expanding the swept volume, and improving oil washing efficiency through surfactants, which is an tertiary oil recovery technology that improves crude oil recovery, has become the main technology for increasing production and efficiency in many oilfields in my country, and plays an important role in ensuring the stable and increasing production of crude oil in China. play an irreplaceable role. [0003] Since the heterogeneous viscoelastic particle solution mainly relies...

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Problems solved by technology

[0006] 1. The test process is cumbersome and the test time is long. It takes more than two days from the beginning of pressing the core to the end of the experiment;

[0007] 2. In the process of pressing the core, the distribution of sand and gravel in the core may be quite different, and the permeability of the core cannot be completely consistent, so the experimental results will have a large error;

[0008] 3. Since the heterogeneous viscoelastic particle solution may cause adsorption and clogging of the core during the injection process, although the resistance coefficient obtained by the test is relatively large

[0009] In summary, the test results obtained by the current drag coefficient test method cannot reflect the real oil displacement performance of the oil displacement system.

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