The Waterflooding Technology Policy Research Of Chang 6 Reservoir At Yan 99 Wellblock

After the development depending on natural energy, the Yan 99 well area is exposed to some problems. From the well area of reservoir geological characteristics of the block stratum, structure, sedimentary characteristics analysis, and according to the storage layer distribution, crack distribution, petrology, reservoir reservoir property and heterogeneity characteristics, as the basis for well area of waterflooding reservoir engineering demonstration. Finally, we get the following conclusions:(1) well area of the law of diminishing exponential decline, the annual decline rate of 8%. (2) the production of oil well is high, and the production rate is low, and the production rate is low, and the energy level is low. (3) the main controlling factor of the 6 oil reservoir is lithology, and the structural form is not obvious, the fracture is not developed,. The maximum principal stress direction is NE80, the average maximum principal stress is 19.4MPa, and the field fracturing is mainly in the north east direction and the direction of the East and West. (4) Chang 62 sand average thickness, lateral reservoir connectivity good oil-bearing area and reservoir connectivity or, as the main development layer (5) reservoir for weak speed sensitivity, water sensitivity, weak salt sensitivity, due to the small area in total volume of water injection speed is slow, the damage to the reservoir can be ignored. (6) the injection pressure is 7MPa, the average single well water injection rate is 3.5m3/d, the average single well water injection is 5.8m3/d, the effective time is 159 days. Block injection production ratio is about adjusting to 1.2. (7) to the seven point well pattern development, later converting to change for determinant of the pattern, the initial well row spacing on the basis of well pattern is 150m×150m. After the deployment of new wells row spacing is 150m×200m. (8) the deployment of new wells wells is 1/2.2. Forecast fifteen years of cumulative oil production 31.92 x 104t, mining degree 18.31%, water content of 59%.