Displacement pressure determination method and system for constant speed and constant pressure chemical flooding oil displacement experiments

Abstract

The invention provides a displacement pressure determination method and system for constant speed and constant pressure chemical flooding oil displacement experiments, wherein the method comprises the steps: obtaining a plurality of pressure data in a constant speed chemical flooding displacement stage, calculating a cumulative injection pressure value, selecting a plurality of average pressure values according to minimum pressure data and maximum pressure data, calculating to obtain a plurality of pressure holding times corresponding to the plurality of average pressure values, then carrying out a constant pressure displacement experiment, to obtain a plurality of corresponding cumulative injection amount data, combining with the plurality of average pressure values, and generating a curve; and according to the cumulative injection amount data obtained in a constant speed displacement experiment, combining with the curve, and calculating to obtain displacement pressure data. According to the displacement pressure determination method and system for the constant speed and constant pressure chemical flooding oil displacement experiments, through the constant speed and constant pressure experiments, the displacement pressure suitable for the constant pressure displacement experiment is obtained. Under the condition of a certain cumulative injection amount, the results of the constant speed and constant pressure experiments can be compared and transformed effectively, so as to play a guiding role in mine field practice.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a method and system for determining displacement pressure in constant-speed and constant-pressure chemical flooding oil displacement experiments. Background technique [0002] At present, there are two methods for indoor oil displacement experiments, constant speed experiment and constant pressure experiment. The constant speed experiment means that the displacement speed and constant pressure are always changing during the displacement process. The constant speed experiment can ensure the cumulative injection volume of the displacement agent. The constant pressure experiment is that the pressure is constant during the displacement process, and the displacement speed may change. The constant pressure experiment is close to the field situation, and the displacement pump is used for constant pressure injection. [0003] The constant speed experiment and the constant pre...

AI Technical Summary

Problems solved by technology

The constant pressure experiment guarantees the constant pressure simulation, but how much pressure should be used to match the field is also a problem, because the indoor core is short, the pressure is too low, the displacement fluid cannot advance, and the pressure is too high, the displacement fluid breaks through too quickly , with the simulated distortion of the live

[0004] Therefore, the defect in the prior art is that the conversion of the on-site pressure and the pressure of the actual indoor experiment cannot be realized, that is, an actual displacement pressure cannot be determined, and then the results of the constant velocity experiment and the constant pressure experiment are not comparable, and it is impossible to compare Mine practice serves as a guide

Images