Apparatus and method capable of simulating matrix-high-permeability zone to carry out displacement experiment

Abstract

The invention relates to an apparatus and a method capable of simulating a matrix-high-permeability zone to carry out a displacement experiment. A main purpose of the present invention is to provide amethod, which can simulate a matrix-high-permeability zone completely saturated with oil to carry out a displacement experiment so as to obtain reliable experimental data. The method comprises: respectively pressing two side matrix rock core parts and a middle high-permeability zone part; conventionally evacuating saturated water from the pressed rock core, and completely saturating with oil by using a first rock core clamper; respectively placing the three rock core parts saturated with oil into the three cavities of the second rubber sleeve of a second rock core clamper, connecting the second rock core clamper to other assemblies of experiment equipment for forming a displacement circuit, and carrying out a displacement experiment; and finally evaluating the seepage flow law and the pressure change condition in the case of the presence of the matrix-high-permeability zone by using the obtained experiment results.

Description

Technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a device and method that can simulate a matrix-high-permeability strip for displacement experiments. Background technique [0002] Indoor physical simulation technology is an effective means to study and improve oil recovery. The current physical model is generally divided into columnar core and square core. These two models and the corresponding core holder can simulate the shape of the rock matrix in the reservoir. [0003] The actual reservoirs of China’s oilfields have formed advantageous channels such as large pore channels and high-permeability bands after long-term injection development. The current level of technical monitoring cannot be 100% monitored, and even control, flooding and plugging cannot be 100%, resulting in objective high-permeability bands. Existence, regardless of the plane or the vertical direction, it is common to displace the remainin...

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Problems solved by technology

[0003] 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 be 100% monitored, even if the adjustment and displacement and plugging are not 100%, resulting in high-permeability strips. No matter in the plane or in the vertical direction, it is common to displace residual oil in matrix-high-permeability strips. At present, conventional columnar one-dimensional columnar cores can be prepared with high-permeability strips in the middle, but saturated oil appears in laboratory experiments. The problem is that because the middle part has a high permeability, when the oil is saturated, the saturated oil will flow out from the middle part, causing the parts on both sides to not be fully saturated, making it impossible to carry out subsequent experiments, resulting in the interruption of the evaluation test

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