Technology and practice of increasing drilling rate for tight oil in Jimusar

Horizontal well drilling technology is a critical way for tight oil development. In 2013, a pilot test was carried out for horizontal well group in tight oil area in Jimusar. In view of long openhole, great displacement of horizontal section, and technical difficulties such as collapse wellbore, lost circulation, low penetration rate and long drilling cycle, a technology for increasing drilling rate for tight oil in Jimusar has been preliminarily generated. It is based on analysis of formation features, optimizing the wellbore configuration, control of wellbore trajectory, optimizing drilling fluid system, making individual drilling bits, reducing drag and torque in slim hole and field application of supporting tools. As a result, the penetration rate was increased by 98.27%, and drilling cycle was shortened by 17.92%. The technology lays solid foundations for further speeding up and larger application scale of long horizontal sections for tight oil in Jimusar.