Dynamic test method for oil and gas well working fluid reservoir protection effect

Abstract

The invention discloses a dynamic test method of the reservoir protection effect of an oil and gas well operating fluid. The method comprises the following steps: 1, preparing the operating fluid; 2, preparing stimulated reservoir water, and adding the stimulated reservoir water into a test device; 3, saturating a stimulated well bottom with water; 4, injecting a displacement fluid, setting a displacement pressure at P0, and determining the stable displacement flow Q0; 5, evacuating the displacement fluid, and injecting the operating fluid; 6, preheating to a reservoir temperature; 7, starting a cycle filtering device with the delivery capacity of QL; 8, pressurizing the operating fluid, and beginning timing; 9, determining the filtering loss of the operating fluid until a preset time is reached; 10, evacuating the operating fluid, injecting the displacement fluid, and determining the change of the flow Qi with the displacement time; and 11, calculating the recovery value Ki. The fluid displacement mode in step 4 and step 10 is reverse displacement, and the fluid displacement mode in step 5 is forward displacement. The method realizes the dynamic stimulation experiment researches of the reservoir protection effect of the oil and gas well operating fluid, and reduces or avoids the productivity loss risk caused by the damages of the operating fluid to near wellbore zones.

Description

technical field [0001] The invention belongs to the technical field of experimental research and testing in the process of petroleum exploration and development, and specifically refers to a dynamic testing method for the protection effect of oil and gas well working fluid reservoirs. Background technique [0002] Oil and gas well working fluid refers to the working fluid used in drilling, well completion, workover and other operations. In addition to meeting the safety, environmental protection and engineering requirements, the working fluid also needs to be used in reservoir sections. Meet reservoir protection requirements. Before the working fluid is applied to the field, an indoor simulation study is usually carried out, and it can only be applied to the field after meeting the requirements. For indoor research on the reservoir protection effect of oil and gas well working fluid, artificial or natural columnar cores (diameter 2.54cm, length about 10cm) are usually selec...

AI Technical Summary

Problems solved by technology

For indoor research on the reservoir protection effect of oil and gas well working fluid, artificial or natural columnar cores (diameter 2.54cm, length about 10cm) are usually selected, and the work is carried out in the well-entry fluid damage evaluation device or dynamic damage evaluation system according to the petroleum industry standard experimental method. The simulated experimental research on the reservoir protection effect of the working fluid basically reflects the influence of the working fluid on the porosity and permeability of the reservoir, but it cannot represent the damage of the working fluid to the overall near-wellbore zone when there are screens or gravel packs. Therefore, the current The method cannot measure the reservoir protection effect of the working fluid of the oil and gas well under the condition of fully simulating the characteristics of the oil and gas well, which will increase the risk of the working fluid damaging the near wellbore area and causing a decline in productivity

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