Progress and Future Solutions of Deep and Ultra-deep Coring Technology
Developing deep and ultra-deep coring technology is one of the important means to explore deep and ultra-deep oil and gas resources.Important indicators such as core recovery,sealing rate,and success rate of in-situ pressure-preserved coring are vital to evaluate the success of coring operation.The afore-mentioned indicators are greatly affected by factors such as formation lithology,coring tool material,structural design,coring procedures as well as on-site operation.After reviewing the challenges during deep and ultra-deep coring,such as high wellbore temperature,high circulating pressure,frequently occurred core blockage by broken strata and difficulty in core po-sitioning and differentiation,this paper analyzes and summarizes some achievements and typical problems of deep and ultra-deep coring technology in China in recent years,investigates the peer core tool designs and successful application cases outside China,and then proposes the future development directions of deep and ultra-deep well coring technology in China.This study is suitable for a series of deep and ultra-deep coring tools and supporting coring technology,providing technical support for"collecting complete and accurate"deep and ultra-deep geolog-ical data and promoting the exploration and development of deep and ultra-deep oil and gas resources in China.
NETL
NSTL
万方数据
维普
