Drilling design and optimization technology of ultra-deep wells in the Tarim Oilfield:a case study of Well Luntan 1, the deepest well in Asia

doi:10.3969/j.issn.1672-7703.2021.03.012

Abstract

Abstract: The dolomite reservoirs of the Lower Cambrian Xiaoerbulake Formation and the Sinian Qigebulake Formation are developed in the platform-basin area in the Tarim Basin, which are close to the source rocks of the Lower Cambrian Yuertusi Formation. The favorable target area is 27500 km2 and it has a broad exploration prospect. However, the geological conditions in this area are very complex. The lithology difference between the upper and lower strata is large. Faults are developed in some strata and the pressure system is complex. In addition,igneous rocks are developed with poor drillability. The complex geological conditions and ultra-high pressure and ultra-high temperature make the drilling face great challenges. Through the research on wellbore structure design based on the integration of geology and engineering,the company has developed wellbore structure design technologies which are suitable for ultra-deep well drilling. Through lab test of rock mechanics characteristics of special formation rocks, it has developed the personalized design and selection of drilling bits combining with the rock breaking characteristics of the strata, and the hydraulic and mechanic parameters have been optimized based on the optimal rock breaking law. Meanwhile, based on the formation lithology characteristics and wellbore stability analysis, the drilling technology has been improved. By continuous research and improvement, the Tarim Oilfield possesses the supporting technology for drilling ultra-deep wells over 8000 m, and capable of drilling wells up to 9000 m. The completion of the Asia's deepest well with a depth of 8882 m, Well Luntan 1, effectively promotes the exploration process of the deep strata and strongly supports the discovery of replacement areas for increasing reserves and production in the Tarim Basin.

Key words: ultra-deep well, wellbore structure design, drillability, drilling parameter optimization, Well Luntan 1

CLC Number:

TE22

Yang Pei, Liu Hongtao, Li Ning, Zhou Bo, Chen Long, Wen Liang. Drilling design and optimization technology of ultra-deep wells in the Tarim Oilfield:a case study of Well Luntan 1, the deepest well in Asia[J]. China Petroleum Exploration, 2021, 26(3): 126-135.

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