Organization
Drilling Technology Research Institute, Shengli Petroleum Engineering Co., Ltd., SINOPEC, Dongying 257000, China
Bohai Drilling Corporation, Shengli Petroleum Engineering Co., Ltd., SINOPEC, Dongying 257000, China
Abstract
Because of the development of faults, low formation pressure coefficient, high temperature at the bottom of the well, and the imperfect performance of drilling fluid system used in the early exploration and development process of Chegu Block, complex situations such as lost circulation, blowout and logging resistance often occurred during the course of drilling. Based on the analysis of the reasons for the complex situation in Chegu Block, the requirements for the selection of drilling fluid system were put forward, and the high-temperature solid-free drilling fluid system was selected and optimized. Laboratory experiments showed that the solid-free drilling fluid system had good temperature resistance, strong lubricity and formation sealing ability. The system had been applied in Chegu 211 Well and Chexie 577 Well in Chegu Block. With the corresponding field drilling fluid maintenance and treatment process, the borehole was stable, the well quality was good, and the borehole cleaning was good. Through assisting drilling engineering, the ROP was improved, and the goal of excellent and fast drilling was achieved.
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