Evaluation for the Application Effect of Gas Drilling Technology in Kuqa Piedmont
Since 2006,the gas drilling technology has been carried out in three blocks in Kuqa piedmont of the Tarim Oilfield,namely Dabei,Bozi and Dibei,and remarkable results achieved.In view of the high abrasive-ness,poor drillability and formation stability of the steep thick conglomerate layer in Kuqa Piedmont,the explo-ration by air drilling technology is carried out and the matching systems optimized,which effectively solves the problem of difficult drilling in the core conglomerate layer in Kuqa Piedmont and greatly improves the drilling ef-ficiency.The average mechanical ROP of the newly drilled wells reaches 6.93 m/h,which is more than twice that of mud drilling in the same area,and the cycle is shortened by 54.2％compared with the design.Nitrogen drilling and completion technology is used for tight sensitive reservoir of Ahe Formation in Dibei block,achieving zero-pol-lution,expanded exploration and improved productivity.The daily gas production of well DB104 reached 72.6×104 m3 and the daily oil production was 51.36 m3,which significantly increased the daily gas production compared with the conventional drilling and completion methods in the same block.However,there are still some problems in gas drilling and completion,such as oil pipe completion string can not meet the long-term safety production.It is sug-gested to continue to carry out technical research to ensure the safe drilling and development of nitrogen drilling.Through the review of this paper,it is helpful for the further development of gas drilling technology in Tarim Oil-field and provides references for the upgrading of gas drilling technology in other domestic blocks.
Kuqa piedmont areatight sandstone gas reservoirAhe formationgas drillingROP optimizationreservoir protection
NETL
NSTL
万方数据
维普
