Water production logging in horizontal wells

New technology has enabled operators to drill an increasing number of extended reach, lateral, and horizontal wells. In these highly deviated or horizontal wells, conventional production logging sensors can be ambiguous in resolving multiphase flows. The successful diagnosis and treatment of water or gas production problems requires the identification of these specific influx zones. Providing reliable production logging solutions in this difficult environment has led to the development of new sensors which can measure both the holdup and velocity of each fluid phase. A novel tool string combination has evolved which incorporates sensors especially targeted at the stratified flow regimes encountered in horizontal wells. Independent, redundant methods are used to measure the flow parameters and enhance the accuracy of the interpreted solution. This paper reviews new integrated production logging methods of evaluating multiphase flow in horizontal wells. Examples are shown illustrating the location and quantification of the flow profiles and fluid distribution in producing wells. This information allows effective treatment of unwanted wellbore fluid entries.