Evaluation Study of Shale Water-based Drilling Fluid Plugging Agent in Chang 7 Member of Yanchang Formation

doi:10.11885/j.issn.1674-5086.2023.06.21.02

Abstract

Abstract: In view of the problem of well wall instability in ultra-low porosity and ultra-low permeability shale formations, taking the shale of Chang 7 Member of Yanchang Formation as the reference object, the mineral composition and lithology characteristics are analyzed by means of X-ray diffraction, permeability, porosity, specific surface area, average pore diameter measurement and scanning electron microscopy, and the idea of maintaining wellbore stability of shale is put forward. By using the simulated “standard thick mud cake” plugging evaluation method, the optimal dosage of ZD-1, JB53, EP-2 and ZD-3 plugging agents and the plugging effect of their combination were evaluated, and the effective compound plugging agent SPA-1 was selected. After adding 4.0% SPA-1 to the water-base potassium formate drilling fluid system for Yanchang shale, the rheology is easy to control and the permeability reduction rate reaches 94.20%. The simulated core electron microscopy images before and after the application further verified the plugging effect and analyzed the plugging mechanism of the plugging agent. The results show that SPA-1 set reasonable particle size distribution and the synergistic effect of rigid and flexible particles can achieve effective plugging, which is conducive to the stability of shale wall of Chang 7 Member of Yanchang Formation.

Key words: shale, water-based drilling fluid, effective plugging, micro-nano plugging agent, borehole stability

CLC Number:

TE254

FU Minhao, WANG Pingquan, LU Jinsong, RAN Chao, SU Junlin. Evaluation Study of Shale Water-based Drilling Fluid Plugging Agent in Chang 7 Member of Yanchang Formation[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2023, 45(5): 173-182.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2023.06.21.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2023/V45/I5/173

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