Technology of Strong Plugging Constant Rheology Oil-Based Drilling Fluid for Shale Oil Reservoir in Damintun Sag of Liaohe Basin

doi:10.3969/j.issn.1006-6535.2023.04.020

Abstract

Abstract: In response to the technical problems such as frequent occurrence of complicated accidents due to insufficient plugging performance of oil-based drilling fluid and long cycle processing time and difficulty in transfer due to strong sensitivity to low temperature in the development of shale oil reservoir in Liaohe Oilfield, an oil-based cross-linked plugging agent and low temperature rheology improving agent were developed to form a set of strong plugging and constant rheology oil-based drilling fluid system, and the performance evaluation and practical application of this drilling fluid system were carried out. The study shows that: The density of strong plugging constant rheology oil-based drilling fluid is 1.80-2.40 g/cm³, and the low temperature resistance reaches -25 ℃ and high temperature resistance reaches over 220 ℃; the drilling fluid has good rheology and settlement stability, the primary recovery rate of shale is 100.0%, the secondary recovery rate is 97.5%, and the plugging rate for shale reaches 60%, which can efficiently slow down the pressure transfer inside the shale. The field application shows that, Strong plugging constant rheology oil-based drilling fluid system has stable rheology and is easy to adjust, with good wellbore stability and high rate of penetrate. This technology can provide a technical reference for efficient drilling of deep and ultra-deep wells in shale and other complex formations.

Key words: oil-based drilling fluid, wellbore stabilization, plugging agent, low-temperature rheology, shale oil

CLC Number:

TE254.3

Yin Jiafeng, Wang Xiaojun, Lu Zhengquan, Bu Wenyang, Sun Lei, Jing Yeqi, Sun Yunchao, Wen Li. Technology of Strong Plugging Constant Rheology Oil-Based Drilling Fluid for Shale Oil Reservoir in Damintun Sag of Liaohe Basin[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 163-168.

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