The Research And Application Of Calcium-resistant High Density Drilling Fluid In North Iran

Calcium-resistant high density drilling fluid for evaporite bed andgypsum layers drilling construction and design,Iran,north oilfield not only paste the rock as well as high pressure brine,the optimum selection of treatment conducted in the lab,including optimization of bentonite,optimization of fluid loss agent,optimization of inhibitors,optimization of lubricants,etc.Build up the density of 2.2g/cm3 and tolerance of 170?,temperature resistant performance and lubricating performance of system optimal meet Iran north area construction,calcium-resistant high density drilling fluid can tolerate 8% bentonite contamination;2ppb cement contamination;10% NaCl contamination;0.2% Ca Cl2 contamination;0.8%gypsum contamination.Calcium-resistant high density drilling fluid applied in the north area of four well s,tracking AZNN-007,AZNN-008,AZNN-009 and AZNN-010 construction of each interval?The second drilling,shale and marl mud making serious,add 2% Hiperm,make drilling fluid has certain inhibitory.The third drilling has high pressure brine layer,use of the calcium-resistant high density drilling fluid,effectively resolves the problem of salt water encroachment,The fourth and fifth drilling fluid density window is narrow,the third drilling fluid was adjusted slowly the density uniform,add 2-3%Lati-rate,calcium-resistant high density drilling fluid met deflecting section and horizontal section of the construction.According to thegeological characteristics of different strata,combining with indoor research and development as a result,the appropriate improvement,sums up the maintenance methods of calcium-resistant high density drilling fluid suitable for the region's,comparing polymer salt drilling fluid system,an average of 20 days shorten the drilling cycle,save the cost by about 10%.