infilling drillinginfilling wellinfiltrated zoneinfiltration areainflatable packreinflection of a bedinflow performanceinfrared detectorinfrared distance measuring equipmentingerss of waterinhibited mudinhibitorinitial dipinitial fieldinitial gelinitial out putinitial permeabilityinitial pressureinitial rating of the wellinitial set of cementinjection areainjection fluidinjection lineinjection perssureinjection pumpinjection waterinjectivityinjectivity profileinmiscibleinner conductorinner core barrelinput gasinrushinsertinsert pump anchorageinsert toothinsert v the casinginserted joint pipeinserted sleeveinside caliperinside pipe cutterinside preventerinsoluble rockinstantaneous logginginstrument pigintake and delivery pressuresintake pressureintegral jointintegral riserintegrating meter