Method for testing acidic rock reaction dynamic parameters for simulating flat-plate flow

Abstract

The invention relates to a method for testing acidic rock reaction dynamic parameters for simulating flat-plate flow. The method is executed on a flat-plate high-pressure acidic corrosion and dynamic filtration analysis device and comprises the following steps of: (1) coaxially putting a rock core into a rock core clamp; (2) vacuumizing a high-pressure filtration kettle through a vacuumizing port and a nitrogen injection port; (3) heating the high-pressure filtration kettle and the clamp to set temperature according to a simulation requirement; (4) adjusting the rotating speed of a rotor of a screw pump according to a working curve of the screw pump and a requirement on the flow speed of test liquid; (5) injecting acidic liquid; (6) opening the vacuumizing port and the nitrogen injection port to inject nitrogen into a high-temperature and high-pressure cavity; (7) sampling from a sampling port; and (8) after sampling is finished, titrating acidic concentration, and analyzing the reaction dynamic parameters. The method is suitable to test the acidic rock reaction dynamic parameters for simulating the flat-plate flow of different sticky and flowing acidic liquid systems; by the method, an actual state of acidic liquid reacting with rock on a stratum layer can be simulated; foundation is laid for scientific test and analysis of the reaction dynamic parameters of various types of acidic liquid systems and rock; and furthermore, dynamic filtration parameters of different types of working liquid in a well and an artificial slit can be simulated.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and relates to the test of kinetic parameters of acid-rock reaction, in particular to a method for testing the kinetic parameters of acid-rock reaction simulated by flat flow. Background technique [0002] Acid fracturing is one of the main means of carbonate reservoir stimulation, and the reaction kinetic parameters are the basis of acid fracturing design. As the types of acid fluids continue to evolve, so do the methods for testing and analyzing the kinetic parameters of the acid fluid's reaction with formation rocks. [0003] When different types of surfactants or high molecular polymers are added to the acid system, the viscosity and flow pattern of the acid system are different. When the shear rate is different, the rheological curves of the acid system are also different. Parameters such as viscosity and fluid state directly affect the kinetic parameters of acid-rock reaction. [0004...

AI Technical Summary

Problems solved by technology

The shortcoming of above-mentioned device and testing method is: can not directly judge the velocity of liquid movement in the reactor by the rotating speed of the rotor of agitating liquid, replaces plane with circular arc surface, and precision is limited by radius of curvature, is used for the sampling point of analyzing acid liquid ion concentration to be restricted. Limited to the uniformity of the liquid in the kettle body, the obtained acid-rock reaction kinetic parameters have certain deviations, and it is impossible to truly simulate the flow rate and pressure of the well fluid on the rock, and the obtained acid-rock reaction kinetic parameters have certain deviations

Images