The article presents the experience of calculating the potential for reducing water production, developed as part of a project to reduce the cost of lifting well products. The idea of the work is to calculate the probability and volume of water production exceeding the level of current production of oil reserves. It is assumed that the positive difference between the actual and theoretical water cut calculated from the production of oil reserves in the well determines the potential for reducing water production and is associated with extraction from an inappropriate interval, or with a violation of the integrity of the well structure, or with water breakthroughs through highly permeable layers, or cone formation. The probability of extraction of “foreign water” is estimated by the degree of compliance with the signs of abnormal flooding.
Materials and methods
The article describes a methodology for analytical search of candidate wells for repair and insulation works based on the developed criteria. Geological and field data of monthly operational reports, data of technological modes, data on perforation intervals and information of design. The results of the calculations allow us to assess the economic efficiency of potential measures to reduce water production.
squeeze job, water shut-off operations, casing patch operations, “foreign water”, productivity coefficient, water cut, premature watering