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Ultra-deep formations in China contain rich hydrocarbon resources.In recent years,the number of ultradeep wells has been continuously increasing.However,efforts to facilitate tlte drilling and exploration of these ultra-deep reservoirs are facing many challenges,such as complicated formation pressures,complicated formation lithologic features,complicated formation fluids,difficulties in the accurate calculation of formation parameters,difficulties in borehole structure design optimization,instabilities in the performances of drilling fluid and key cementing materials/systems,high temperature-resistance and pressure-resistance requirements for downhole tools and instruments,complicated engineering problems,and slow drilling speeds.Under such circumstances,it is very difficult to ensure the performance of such drilling operations.In order to address these challenges,SINOPEC has developed relevant drilling technologies for ultra-deep wells in complicated geological conditions through intensive research on accurate descriptions of complex geologic characteristics,borehole structure design optimization,fast drilling techniques for deep and hard formations,temperature-resistant highdensity drilling fluid,anti-channeling cementing in high-pressure gas wells,borehole trajectory control in ultra-deep horizontal wells and other key technologies.These technologies can provide sound engineering and technical support for tlte exploration and development of hydrocarbon resources in ultra-deep formations in China.
Ultra-deep formations in China contain rich hydrocarbon resources. Recent years, the number of ultradeep wells has been continuously increasing. However, efforts to facilitate tlte drilling and exploration of these ultra-deep reservoirs are facing many challenges, such as forcing formation , complicated formation lithologic features, complicated formation fluids, difficulties in the accurate calculation of formation parameters, difficulties in borehole structure design optimization, instabilities in the performances of drilling fluid and key cementing materials / systems, high temperature-resistance and pressure-resistance requirements for downhole tools and instruments, complicated engineering problems, and slow drilling speeds.Under such circumstances, it is very difficult to ensure the performance of such drilling operations. In order to address these challenges, SINOPEC has developed relevant drilling technologies for ultra-deep wells in complicated geological conditions through inte nsive research on accurate descriptions of complex geologic characteristics, borehole structure design optimization, fast drilling techniques for deep and hard formations, temperature-resistant high density drilling fluid, anti-channeling cementing in high-pressure gas wells, borehole trajectory control in ultra-deep horizontal wells and other key technologies. these technologies can provide sound engineering and technical support for tlte exploration and development of hydrocarbon resources in ultra-deep formations in China.