Method for carrying out displacement experiment after fully saturated oil in matrix-high permeability strip core

Abstract

A method for flooding experiments on matrix-hyperpermeable strip cores fully saturated with oil. The method is composed of the following steps: select matrix cylinder core and high-permeability strip cylinder core after cutting as three parts of the first matrix-high-permeability strip synthetic core; three pieces of core are placed in an evacuated tank to evacuate and then saturate with water ; The three rock cores are separated by filter paper, and the ends are bonded to form a cylindrical first matrix-high-permeability strip synthetic core; the first matrix-high-permeability strip synthetic core is put into the core holder, and placed Under the condition of different ring pressure, test the permeability of water, and determine the theoretical permeability K 理论 The ring pressure P when approaching; the second matrix-hyperpermeable band synthetic core is synthesized by cutting the saturated water- and oil-treated matrix and the hyperpermeable strip cylindrical core; the fully saturated oil-saturated second matrix-hyperpermeable band is used Synthetic cores, using the determined and theoretical permeability K 理论 When approaching the ring pressure P, the displacement experiment was carried out.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for carrying out displacement experiments on matrix-high permeability strip cores. Background technique [0002] The actual reservoirs in my country's oilfields have been developed through long-term injection to form advantageous channels such as large pores and high-permeability strips. The current technical monitoring level cannot fully monitor, nor can it realize all control, displacement and plugging, resulting in the objective existence of high-permeability strips. No matter in the plane or in the vertical direction, it is common to displace remaining oil in the case of matrix-hyperpermeable strips. At present, conventional columnar one-dimensional columnar cores can be prepared with hyperpermeable strips in the middle, but saturated oil occurs in laboratory experiments. For the oil problem, because the middle part has a high permeability, the ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems mentioned in the background technology, the present invention provides a method for carrying out displacement experiments on the matrix-high-permeability strip core after being fully saturated with oil. In this method, parallel rock sample preparation, cutting, and bonding are used. The method of testing, testing and adding ring pressure ensures that the spliced ​​core does not form cracks, ensures that the matrix-hyperpermeable strip core used in the displacement experiment can meet the requirements of fully saturated oil, and overcomes the original one-dimensional matrix-hyperpermeable strip core. Technical challenges with unsaturated oil in the matrix due to permeability differences

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