Application of a Biosynthesis-based Drilling Fluid in the Changning Gas Field

doi:10.11885/j.issn.1674-5086.2018.12.21.01

Abstract

Abstract: Oil-based drilling fluids used in horizontal shale gas wells, is of high risk of environmental pollution and is difficult dispose. To solve the problems, a novel and environmentally friendly drilling fluid system for shale gas wells was developed. Through the preparation of a biosynthesis-based oil and experimental evaluation of the performance of this formula, a waterin-oil emulsion drilling fluid system with modified vegetable oil as the continuous phase and brine as the dispersed phase was developed. The system, which does not contain aromatic hydrocarbon components, is biodegradable and meets environmental protection standards in wastes disposal. The biosynthesis-based drilling fluid was applied in three wells on the HA platform in Changning Gas Field. The results from this application show that the system possesses good inhibitive, sealing, and lubrication characteristics, ensureing smooth operations during drilling, electric logging and casing running, lowering environmental risks, and enabling low waste disposal costs.

Key words: biosynthesis base, drilling fluid, shale gas, Changning Gas Field, environment protection

CLC Number:

TE242

FAN Yu, ZHONG Chengxu, MU Naiqu, JIN Xin, WU Pengcheng. Application of a Biosynthesis-based Drilling Fluid in the Changning Gas Field[J]. 西南石油大学学报(自然科学版), 2020, 42(1): 133-139.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2018.12.21.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2020/V42/I1/133

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