Study on Mathematical Model and Influencing Factors of Composite Temporary Plugging Pump Pressure in Shale Gas Wells

doi:10.3969/j.issn.1006-6535.2023.04.019

Abstract

Abstract: At present, the pump pressure prediction of shale gas well fracturing mainly relies on commercial software fitting, and there are few mathematical models for predicting the amount of temporary plugging agent and pump pressure. To this end, a mathematical model for pump pressure prediction of composite temporary plugging was proposed by taking into account the final speed of temporary plugging agent migration, fracture width, temporary plugging agent resistance and other factors, and the effect of composite temporary plugging parameters on pump pressure was analyzed. The result shows that with the dosage increase of composite temporary plugging agent dosage, the pump pressure increases; compared with the single temporary plugging agent, the dosage of composite temporary plugging agent dosage is more sensitive to the pump pressure; with the increase of temporary plugging particle size, the peak pump pressure shows an increasing trend; the pressure starting and boosting time of composite temporary plugging agent is significantly reduced compared with the single temporary plugging agent, and the temporary plugging effect is better; when the dosage of composite temporary plugging agent is 180 g, the pressure boosting time is 31 s, and the peak pump pressure can reach 17.5 MPa, compared with the temporary plugging agent with the particle size of 0.8 mm, the boosting time is shortened by 51 s, the peak pump pressure is increased by 2.7 MPa, and the boosting speed is increased by 63.09%. Indoor experiments and field applications show that the maximum errors between the calculated and measured pump pressure values are 6.76% and 6.27% respectively. It has guidance significance of the mathematical model of composite temporary plugging pump pressure prediction to the dosage of temporary plugging agent and the evaluation of temporary plugging effect.

Key words: deep shale gas, composite temporary plugging, pump pressure, temporary plugging agent

CLC Number:

TE357

Kong Xiangwei, E Xuanji, Qi Tianjun, Chen Qing, Ren Yong, Wang Subing, Li Ting, Liu Yu. Study on Mathematical Model and Influencing Factors of Composite Temporary Plugging Pump Pressure in Shale Gas Wells[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 156-162.

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