Water Plugging and Fracturing Technology for Tight and Bottom-Water Gas Reservoir in the Sulige Gas Field

Upon completion of fracturing operations,tight gas reservoirs with bottom water may communicate with water-bearing formations,and consequently may cause rapid increases in water cut and reduce the production period. Under such circumstances,an innovative plugging agent has been developed independently. With consideration to rules of grain settlement,patterns in fractures growth,geologic features in reservoir formations of Block E of the Sulige Gas Field,optimized perforation positions and other process parameters,the plugging agent can be used in combination with fracturing operations for water plugging and fracturing in gas reservoirs with bottom-water. The newly developed technology was applied in 14 wells in Block E of the Sulige Gas Field. Compared with performances of neighboring wells with conventional fracturing technologies,the well with the innovative technology has average water production reduction of 62.6%,while gas production increased dramatically. Research results showed that the plugging agent can form low-permeability layers under reservoir conditions to prevent bottom water coning. In this way,relevant wells may have reduced water production and enhanced gas production while effectively controlling bottom water effectively.