伊拉克哈法亚油田高压盐膏层安全钻井技术

doi:10.13278/j.cnki.jjuese.20200021

Abstract

Abstract: Drilling of salt paste layers is one of the problems of current drilling technology. During the drilling construction, there are problems such as the difficulty in safe drilling of salt paste and soft mudstone layers, control of well quality, and high probability of stuck drilling, etc. Based on the formation conditions of Halfaya oilfield in Iraq, the authors changed the casing sealing point of salt-gypsum interval,effectively controlled the casing leakage,and optimized the angle of directional trajectory well from 71.29° to 29.48°, thus avoided the well sections that are easy to form rock chip beds and the well stuck in the directional sections, hereby the drilling efficiency was improved by 23%. The shrinkage period of soft mudstone in Halfaya oilfield is determined to be 48 h approximately. Drilling according to the diameter reduction law effectively reduced the formation of mud packs at the bit and mud rings. Through this study,the principle of controlling the density of saturated brine drilling fluid according to the content change of gypsum rock and salt rock is determined, and the on-site maintenance technical measure for viscosity control of saturated saline drilling fluid is formed.

Key words: salt-gypsum formation, drilling well, wellbore configuration optimization, drilling fluid system optimization, Halfaya oilfield

CLC Number:

P618.13

Xie Chunlai, Wang Zhaoyang, Qiu Yue, Gou Guangzhou, Gao Junfei, Yin Guang, Wu Yong. Safe Drilling Technology of High Pressure Salt Paste Formation in Halfaya Oilfield, Iraq[J].Journal of Jilin University(Earth Science Edition), 2020, 50(2): 589-597.

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Safe Drilling Technology of High Pressure Salt Paste Formation in Halfaya Oilfield, Iraq

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