A physical simulation test method for tight oil recovery

Abstract

The invention relates to the technical field of petroleum exploitation, and in particular to a tight oil exploitation physical simulation test method. The method includes the following steps: (1) testing porosity and permeability of a rock core; (2) applying confining pressure to the rock core; (3) injecting a fluid body to the rock core so as to the inner pressure of the rock core to reach formation pressure; (4) supplementing the fluid body; (5) conducting linear reduction of system inner pressure so as to enable the fluid in the rock core to flow out continuously, and recording volume of the fluid body that flows out; (6) conducting a blank test; (7) and drawing the volume of the fluid body and system pressure, and obtaining an exploitation curve. The method of the invention realizes the physical simulation in the course of the tight oil exploitation, and has excellent repetition at each test point, small errors, and produces a test result that has a strong contrast to onsite production effects of the tight oil. The method of the invention acquires tight oil exploitation key technology parameters through the simulation test, provides test methods for tight oil theory and technology research, and provides basis for relevant scheme compiling of tight oil exploration, evaluation and development and optimization of target blocks.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, and in particular relates to a physical simulation test method for tight oil exploitation. Background technique [0002] Tight oil is a kind of tight reservoir that occurs in symbiosis or close contact with oil source rocks (surface permeability is generally less than 1×10 -3 μm 2 ) in unconventional oil resources. According to the requirements of tight oil exploration and development, petroleum production enterprises and research institutes need to simulate and evaluate the exploitation of tight oil, so as to provide a basis for production deployment, development plan formulation, and development effect evaluation. However, due to the significant difference between tight reservoirs and conventional reservoirs, the water flooding simulation test method (SY / T 5345-2007) used for simulation of conventional reservoir production is not suitable for simulation of tight oil production, ...

AI Technical Summary

Problems solved by technology

[0003] (1) The existing method uses a measuring cylinder to measure the volume of produced fluid, the minimum division value is 0.05mL, and the measurement error is large when the fluid volume is small;

[0004] (2) Using existing methods to simulate tight oil production, under the action of high fluid seepage resistance, the pressure at the inlet end of the core during the saturation and displacement process is particularly high, resulting in simulation failure;

[0005] (3) Using the existing method to simulate the natural energy recovery of tight oil, the fluid may be released instantaneously, and the effective test time is extremely short, resulting in poor simulation similarity and difficult measurement, and the simulated water flooding oil production test cycle is particularly long;

[0006] (4) It is difficult to control the pressure drop at the outlet end of the core with the existing simulation technology, and the strong stress sensitivity will cause the simulation conditions to deviate from the actual

Images