Technical difficulties and countermeasures of high density drilling fluid in west Sichuan
The west Sichuan area is an important area for oil and gas exploration and development in the southwest of China Petrochemical Corporation.It focuses on the Gaomiaozi and Zhongjiang blocks.The strata encountered in the area are complex.The main target strata are the upper and lower Shaximiao formations with high formation pressure coefficient,since the second opening,the density of drilling fluid exceeds 2.10 g/cm3,the rheological property of high-density drilling fluid is difficult to control during construction,the wellbore in-stability of Shaximiao formation is serious,the formation safety density window is narrow,and the friction of horizontal section is large,and it is difficult to measure and run casing.In view of the technical difficulties in the construction of high-density drilling fluid in west Sichuan,on-site technical countermeasures were formed through laboratory experimental analysis.
high density drilling fluidwell-bore stabilityrheologyfriction resistance
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