Optimization and application of the efficient plugging system in the Haituo block

Abstract:

With the low formation fracturing pressure and presence of a large number of natural fractures in the Haituo block， pervious circulation loss and lost return are very easy to occur during drilling， resulting in wellbore instability. In view of serious leakage in the Haituo block， a plugging-while-drilling fiber YTZ was prepared. At the same time， the composite plant fiber Xa and the fast plugging agent KF， which are well compatible with the base slurry， were selected to improve the ability of drilling fluid to stabilize the wellbore. Through the combination of the three plugging materials， a plugging system， and proper and effective drilling technology for the Haituo block have been formed， which effectively solved various well leakage problems in Haituo block， ensured the smooth drilling and completion progress， and reduced the economic losses caused by leakage. The plugging system showed good plugging effect through field application， and is worthy of further popularization and application in the Haituo block.