Method and device for accurately simulating rock core displacement under pressure in the laboratory

Abstract

A method and device for accurately simulating rock core displacement under pressure in a laboratory. The main purpose is to solve the problem that the porosity of the core is easy to change during the deformation process when simulating the core displacement in the laboratory, which leads to the inaccurate data obtained. The method is summarized as follows: Calculate the reasonable displacement pressure required for displacement through empirical formulas, calculate the ring pressure and displacement pressure required to maintain porosity according to the porosity change formula, so as to keep the core porosity unchanged, And keep the ring pressure changing with the displacement pressure during the core displacement process, so that the pressure difference remains unchanged. A device with an adjustable temperature electric heating core holder is designed, and a back pressure valve is added at the outlet end of the core holder to keep a certain pressure in the holder. According to the empirical formula, a reasonable displacement pressure is obtained, and then The pressure difference between the ring pressure of the holder and the displacement pressure is kept constant through the ring pressure system to ensure that the porosity of the core remains unchanged during the deformation process.

Description

technical field [0001] The invention relates to a method and a device for placing and displacing rock cores under pressure in a laboratory, in particular to a method and a device for performing more accurate simulation experiments on formation cores in oil field development and production. Background technique [0002] In reservoir development engineering, testing and displacement experiments on cores are generally carried out in laboratories. However, after a long period of practical application, it was found that the existing test flooding method has the following problems: the test flooding method commonly used in the laboratory is only to inject water and saturated oil under pressure at one end of the test core, heat it and place it, and then Go straight to the test experiment. As a result: 1. There is no pressurization during the heating and placement of the core to be tested; 2. Only applying high pressure to one end of the core to be tested may cause the core pore st...

AI Technical Summary

Problems solved by technology

As a result: 1. There is no pressurization during the heating and placement of the core to be tested; 2. Only applying high pressure to one end of the core to be tested may cause the core pore structure to be damaged or fractured; 3. The constant temperature box currently used in the laboratory Cannot achieve high temperature, so it is difficult to simulate formation temperature

The above three factors lead to large errors in the data of the core test displacement experiment obtained by the laboratory experiment

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