Application of ultra-long horizontal section oil-based drilling fluid technology in Wei 204H47-10 well
Well Wei 204H47-10,located in Weiyuan block in central Sichuan,is a shale gas development well with a horizontal section of 3 210 m.During the drilling of the ultra-long horizontal section,shale rock and fracture zone will be encountered,which is prone to collapse of the shale horizontal section,fracture leakage and difficulty in hole cleaning.In view of this series of problems,this paper has formed a set of oil-based drilling fluid system with strong plugging property by optimizing oil-based drilling fluid treatment agent.At the same time,according to the brittle formation and fracture zone of Longmaxi formation shale,corresponding technical measures for collapse prevention and leakage prevention have been formulated.The specific formula is white oil+20%～25%brine(CaCl2 mass volume is 20%～30%)+5%HYOZ+1%～2%HYOL+1%～2%TYODF-101+2%～3%HFLO+1%～2%FHXS+5%CaO+barite.The successful completion of Well Wei 204H47-10 shows that the optimized oil-based drilling fluid system and targeted anti collapse and anti-leakage technical mea-sures can improve the quality and efficiency while ensuring the safe drilling of ultra-long horizontal section,which can provide reference for the drilling of ultra-long horizontal sec-tion in Weiyuan block.
NETL
NSTL
万方数据
维普
