Study and Application of Low Damage Drilling Fluids for Low Permeability Reservoirs in Shengli Oilfield
The low permeability reservoirs in Shengli oilfield is featured by large buried depth,poor physi-cal properties,strong diagenesis and heterogeneity,and there exist serious water sensitivity damage and water lock during the drilling process,which significantly restricts the exploration efficiency and benefits of low permeability reservoirs.In order to solve the reservoir protection problems of low permeability res-ervoirs,novel polymer plugging agent(SLRP)and water lock prevention agent(SLWB)were optimized and characterized in detail,and the polymer plugging agent(SLRP)could work synergistically with water lock prevention agent(SLWB)to impart reservoir protection performance due to film-forming shielding effect,wettability alteration and low interfacial tension.The low damage water-based drilling fluids were also established,and the results indicated that low damage water-based drilling fluids exhibited excellent reservoir protection performance with permeability recovery of above 95%,and filtrate interfacial tension is 18.5 mN/m.The low damage water-based drilling fluids have successfully applied in the Bin 425 block and Da 43 block for more than 40 wells.It is concluded that the low damage water-based drilling fluids displayed stable rheological and filtration control behavior and the average drilling period was shortened by 11.73 d.What's more,due to excellent reservoir protection performance of the low damage water-based drilling fluids,acid fracturing would not be necessary to low permeability reservoirs before well pro-duction,and average daily production per well could be increased to 7.63 t/d.The field test results con-firmed that the low damage water-based drilling fluids could be priority alternatives to low permeability reservoirs exploration in Shengli oilfield.
Low permeability reservoir reservoir protection water-based drilling fluid synergetic effects field application
Zhenguo Su Ruihe Wang Erding Chen Junyi Liu Xiuling Li
School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,Ch School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,Ch Shengli Petroleum Engineering Corporation Limited of SINOPEC,Dongying,Shandong,257100,China
国内会议
青岛
英文
92-101
2018-06-20（万方平台首次上网日期，不代表论文的发表时间）