Drilling technology for horizontal well with long horizontal sectionin Santanghu tight oil reservoir

Tight oil exploration in Santanghu Basin enjoys a broad prospect, and horizontal well technology is an important means for effective development of this region. This paper started with analysis of difficulties in horizontal well drilling in Santanghu tight oil formation and carried out research on key techniques such as wellbore configuration optimization and profile design, specific drilling selection, low-cost and high-efficient trajectory control, increasing the encountering rate of reservoirs by horizontal section and quality, and effective drilling fluid, etc. The paper has also developed supporting technique series suitable for optimized fast drilling of tight oil horizontal wells in Santanghu Basin, which has been successfully used in five wells like Well Lu 101 and realized remarkable increase in drilling rate.