Physical simulation experiment method and experiment device for evaluating matching relation of chemical oil-displacing agent and reservoir permeability

Abstract

The invention discloses a physical simulation experiment method and a series micropore filter membrane flow experiment device for evaluating the matching relation of a chemical oil-displacing agent and the reservoir permeability. The series micropore filter membrane flow experiment device comprises a pressure difference control and measurement assembly, a module combined type series filter membrane unit assembly and a data real-time collecting and processing assembly. The pressure difference control and measurement assembly comprises an air oil-less compressor, a stabilized pressure pump and a pressure sensor. The module combined type series filter membrane unit assembly comprises a liquid storage device and a micropore filter membrane mounting device. The data real-time collecting and processing assembly comprises a balance and a weight and pressure measuring software system, wherein the balance and the weight and pressure measuring software system are connected with a computer. The weight and pressure measuring software system is used for recording the size of pressure and the mass of flow-out liquid and collecting data. The micropore filter membrane mounting device is used for mounting micropore filter membranes with the diameters of 47 mm. The pressure difference control and measurement assembly, the module combined type series filter membrane unit assembly and the data real-time collecting and processing assembly are connected through hoses and are used for controlling series experiments through valves.

Description

technical field [0001] The invention belongs to the technical field of enhanced oil recovery by chemical flooding, and relates to a physical simulation experiment method for evaluating the matching relationship between a chemical flooding agent and reservoir permeability and a matching series microporous membrane flow experiment device. technical background [0002] Chemical flooding technology is an important method to enhance oil recovery, including polymer flooding and composite chemical flooding. Injection capacity is one of the main performance indicators of chemical oil displacement agents. Good injection performance can make chemical oil displacement agents advance evenly in layers with large differences in reservoir conditions in the same layer system, improve sweep efficiency, and thus increase oil recovery. yield. The rock pore space of the reservoir is mainly composed of pores and throats. The size of the throats controls the permeability of the reservoir rocks. ...

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Problems solved by technology

This experimental method can preliminarily and quickly judge the hydrodynamic size of a polymer, but it has the following disadvantages: 1. Because the polymer hydration molecules are viscoelastic, they will deform under pressure, so the flow rate is used as the main technical index to judge Whether the polymer can pass through the specific pore throat is not accurate and comprehensive. More importantly, because the relationship between the pore size of the microporous membrane and the permeability of the reservoir has not been established, the experimental results are insufficient for the application of the oil displacement agent in the actual reservoir. Guiding significance; 2. Use a nitrogen cylinder to provide pressure, use a pressure reducing valve to adjust the required pressure, and use a stopwatch to record the outflow time of the effluent. The accuracy of the experiment is not high, and the amount of data is small, so it is difficult to analyze the dynamic flow experiment of the oil displacement agent. Features; 3. The experimental device can only achieve single-stage filtration, but not multi-stage filtration. Therefore, the compatibility between the polymer solution and the microporous membrane can be preliminarily judged, and the conductivity of the injected fluid cannot be judged through dynamic analysis, which cannot be determined. Whether the oil displacement agent can advance uniformly in the formation; 4. This experimental method does not consider the intermolecular interaction, so it is only suitable for the study of polyacrylamide without intermolecular interaction, and is not suitable for the study of new types of flooding with supramolecular structure. oil agent

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