Gas Drilling for Lost Circulation Prevention and ROP Optimization Technology in Tongnanba Complex Structural Zone,Northeastern Sichuan
The Tongnanba structural zone is influenced by the structural superposition of the Micangshan thrust structural zone and the Dabashan arc-shaped thrust thrust structural zone,with well-developed faults and frac-tures.The formation pressure above the Xujiahe Formation in this block is low,and in the early-drilled wells oc-cur severe lost circulation and low ROP.In this paper,a technical scheme with the optimization of well depth structure,gas injection/foam parameters,drilling tool combination and drilling parameters optimization design is formed,by analyzing the necessity of applying gas drilling technology and based on the evaluation of wellbore stability,formation drillability,and adaptability of borehole purification ability.The successful application of 13 wells has not only avoided the complexity of lost circulation in the upper formation,but also increased the aver-age penetration rate by more than 6-9 times.This provides technical support for the safe and efficient develop-ment of over one trillion cubic meters of natural gas in the Tongnanba structural belt.
Tongnanba complex structural zonegas drillinglost circulation prevention and ROP optimization
NETL
NSTL
万方数据
维普
