An optimization method for mass concentration gradation of plugging particles with different oil absorption ratios in oil-based drilling fluid

Abstract

The invention provides an optimal method for mass concentration gradation of plugging particles with different oil absorption ratios for oil-based drilling fluids. The method tests the highest crack plugging pressures of different concentration dispersions of plugging particle materials with different oil absorption ratios, and concludes The calibrated use concentration of the plugging granular materials with different oil absorption ratios. According to the above calibration concentration, the combination of plugging granular materials with different oil absorption ratios is determined; then, the plugging with different oil absorption ratio combinations is completed by determining the relationship between the concentration of plugging granular materials with different oil absorption ratio combinations and the maximum plugging pressure of fractures The selection of particle material concentration, and then complete the mass concentration gradation optimization of plugging particles with different oil absorption ratios. The method of the present invention overcomes the blindness in selecting the concentration of the plugging agent in the past, provides technical support for the full utilization of the plugging agent and the improvement of the plugging effect, and provides plugging for tight oil, tight gas, shale oil and shale gas formations Provide theoretical support for the selection of the concentration of the plugging agent.

Description

technical field [0001] The invention relates to an optimal method for mass concentration gradation of plugging particles with different oil absorption ratios for oil-based drilling fluid, and belongs to the field of drilling fluid plugging. Background technique [0002] Lost circulation is one of the common downhole complex situations in the drilling process, and the plugging technology is one of the important directions of long-term research by domestic and foreign researchers. In recent years, the development of shale gas has developed rapidly in my country. Compared with water-based drilling fluid, oil-based drilling fluid hardly reacts with water-sensitive formation minerals, and has the advantages of strong inhibition and good lubricity. An important means for complex formations such as shale and mudstone. Due to the instability of shale formations and the common development of pores and micro-fractures in shale formations, oil-based drilling fluid leakage is prone to o...

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Problems solved by technology

[0003] However, at present, when plugging micro-fracture leakage, the selection of the mass concentration of plugging particles with different oil absorption ratios is blind. According to the construction process, it is too dependent on the personal experience of field operators to match the plugging particles and micro-cracks. The ability is poor, and the matching relationship between the fracture and the oil absorption ratio of the plugging agent has not been established, resulting in blindness in the selection of the mass concentration of the plugging particles with different oil absorption ratios, and the concentration of the plugging material and the oil absorption ratio are not well matched with the internal size of the fracture. , resulting in poor plugging effect and increased cost of drilling fluid

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