Borehole Wall Stabilization Drilling Fluid Technology of Longmaxi Formation Horizontal Section in Chang\-ning Block

doi:10.11885/j.issn.1674-5086.2021.08.27.01

Abstract

Abstract: In view of the complicated downhole conditions such as sticking and buried drilling caused by wellbore instability in horizontal section of Longmaxi Formation in Changning Block, it is found that Longmaxi Formation shale is characteristics of strong brittleness and weak water sensitivity. Under the condition of increasing well depth, stress and external force, it is easy to produce micro-cracks. After the filtrate of drilling fluid intrudes into the well wall, micro-cracks continue to expand and lead to the instability of the well wall. According to the characteristics of micro-fractures, a variety of micro-nano materials are used to effectively plug the downhole, and a set of strong plugging oil-based drilling fluid system with adjustable density is established, which has good plugging effect, good hole cleaning, and stable settlement performance. The field experiment shows that the torque of tripping and tripping is significantly reduced when the drilling fluid system is tested from 3 600 m to 4 200 m. It is proved that the drilling fluid system forms a tight plugging layer on the borehole wall, which plays an important role in borehole stability.

Key words: wellbore stability, oil-based drilling fluid, micro-nano plugging, horizontal well, shale gas

CLC Number:

TE254.6

BAI Yang, LI Daoxiong, LI Wenzhe, LI Hongbo, LUO Pingya. Borehole Wall Stabilization Drilling Fluid Technology of Longmaxi Formation Horizontal Section in Chang\-ning Block[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2022, 44(2): 79-88.

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