Research in and application of optimization of wellbore configuration in the Block B at the right bank of Amu Darya

The natural gas project at the right bank of Amu Darya is a significant cooperation project between Petro China and Turkmenistan in the field of energy. In this Project, due to the complicated geological environment, high drilling difficulty and high risk in Block B, the drilling and exploration operations will face many difficulties and challenges, and high requirements are come up with for the design and optimization of wellbore configuration. In this study, based on brief analysis of the complicated geological environment and difficulties in drilling technologies, combined with the previous drilling experiences and taking into account various factors, we put forward the 4th-spud and 3rd-spud wellfore configuration based on whether there was secondary gas pool and high pressure water in shallow formations. The optimized wellbore configuration has been promoted and applied in this Block, which has greatly shortened drilling period by 71.85 days to 126 days, improved the drilling rate by 5% to 42%, achieving favorable application effectiveness.