Chang6Reservoir Water Injection Effect Assessment In Tang114Wellblock

Ganguyi oil field is subordinate to Yanchang oil field Co., Ltd, which is located at thejunction of Yan’an city and Yan’chang county in Shaanxi Province and is typical of lowporosity, low permeability and low capacity lithological reservoir. The water channelingphenomenon of some oil wells emerged in the long-term water injection development processof development process of Ganguyi oil field, this situation led to the higher moisture content,low oil recovery rate, water injection difficulties and other issues. In order to solve theseproblems, in the Paper, Chang6reservoir water injection effect in the Southern Tang114wereevaluated by relatively mature reservoir engineering techniques in recent years, in order tofurther improve development effect of the Tang114well block, and to provide detailed andreliable scientific evidence for making practical comprehensive adjustment program.Based on the above research, the paper draws the following conclusions:1、Chang6reservoir of T114wellblock in Ganguyi oilfield is a lithologic reservoir, poorreservoir physical property, oil and water mix storage, oil-water differentiation was notobvious, there is no obvious oil-water interface, lack of edge water and bottom water, so thereservoir is a typical elastic-dissolved gas drive lithologic reservoir.2、Water injection development contradictions in T114wellblock is mainly that localpattern water channeling phenomenon of some oil wells emerged, the water content of somewells increases too fast, local injection-production is imperfect, the well water injection effectis uneven, part of the well water injection is no effect or the effect is not obvious, which resultin low yield inefficient.3、The counter-nine injection wells net used in T114wellblock can match well withwater driving orientation, fracture orientation, the direction of the main infiltration, anddistance far from the water injection wells to production wells is reasonable. At present, theformation pressure is1.74MPa, which is close to the formation pressure range lower limit,and need to further add up formation energy.4、In T114wellblock, after injection and production wells net has been improving, blocksthe production decline rate of blocks decreased from4.7%to2.2%, water injection effect isobvious, the cumulative water storage rate is basically stable, water flooding is in good condition, the average the producing thickness percentage is88.2%, the overall waterabsorption is also in good condition.5、Currently, the output of the oil producing region is basically stability, water injectionwas significantly effective, production condition is in the low water period, water injection issubject to fracture orientation, the direction of the main infiltration, and the orientation of thewells net. Well injection water has obvious directionality.6、According to the present main problems of T114wellblock, suggestions of the latedevelopment adjustment can be considered from two aspects, the first is improvinginjection-production well net, the second is making development planning and adjustinginjection-production relation.