Method and system for determining displacement pressure in constant-rate and constant-pressure chemical flooding experiments

Abstract

The present invention provides a displacement pressure determination method and system for constant-rate and constant-pressure chemical flooding experiments. The method is: obtain multiple pressure data in the constant-rate chemical flooding stage, calculate the cumulative injection pressure value, and According to the minimum pressure data and maximum pressure data, select multiple average pressure values, and calculate multiple pressure holding times corresponding to multiple average pressure values, and then conduct constant pressure displacement experiments to obtain corresponding multiple cumulative injection data. Combine multiple average pressure values ​​to generate a curve; according to the cumulative injection data obtained in the constant-rate displacement experiment, combine the curves to calculate the displacement pressure data. The method and system for determining the displacement pressure of the constant speed and constant pressure chemical flooding experiment of the present invention can obtain the displacement pressure suitable for the constant pressure displacement experiment through the constant speed and constant pressure experiment. Under the condition of a certain cumulative injection volume, the results of constant velocity and constant pressure experiments can be effectively compared and transformed, and then play a guiding role in mine 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...

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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

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