Key Technologies for Optimal and Fast Drilling of Tight Gas Slim Holes in Southern Jiaxian Block
In order to further improve the drilling efficiency and reduce the drilling costs in Southern Jiaxian Block,a technology for one-trip optimal and fast drilling during second spud in of slim hole was studied.For impro-ving the one-trip proportion during second spud in of slim hole in Southern Jiaxian Block,based on the geological characteristics of the block,the difficulties and technical requirements of slim hole drilling was analyzed,the well-bore trajectory was finely designed,the bit,bottomhole assembly and drilling parameters were optimized,and the anti-sloughing pressure bearing drilling fluid system and composite lost circulation technology were built.Finally,key technologies were formed for optimal and fast drilling of slim hole in the block,and were applied in 75 wells.The study results show that the one-trip proportion during second spud in of applied wells has increased from 13.4%to 62.7%,the rate of penetration has been increased to 23.4 m/h,the completion period has been reduced to 17.65 d,and the single well leakage has been obviously reduced.The study conclusions provide technical support for continuous ROP improvement and cost reduction in optimal and fast drilling of slim holes.
tight gas slim holeone tripdrilling fluidsealingSouthern Jiaxian Block
万方数据
维普
