大庆油田杏一—三区西部Ⅲ块低渗储层经历天然能量、水驱和聚合物驱多种开发方式,剩余油分布十分复杂,开发效果亟待改善。因此,在剩余油研究和开发效果分析的基础上,将区块分为正常聚合物驱、套管损坏聚合物驱、聚合物后续水驱3个区域,利用人造岩心驱油和数值模拟技术开展改善区块开发效果技术对策研究。正常聚合物驱历经多年化学驱开发,剩余油零星分布在砂体边部及渗透率较低部位;套管损坏聚合物驱受防套关控影响,油层动用差,剩余油储量较高。因此,针对不同区域特点,在开发方式、驱油体系、井网设计3个方面进行优化,正常聚合物驱及聚合物后续水驱区域采用普通聚合物驱抽稀为五点法175 m井距井网,段塞尺寸为0.40倍孔隙体积;套管损坏聚合物驱区域采用普通聚合物驱局部加密成五点法140 m井距井网,段塞尺寸为0.70倍孔隙体积,全区预测提高采收率为3.53个百分点。方案实施后目前区块累计注入聚合物前置段塞为0.10倍孔隙体积,预计可增油9 780 t。该研究可为聚合物驱区块改善开发效果提供借鉴。
The reservoirs with low permeability in the western part of Block Ⅲ of District Ⅰ to District Ⅲ in Xingshugang Oilfield in Daqing Oilfield experienced various development stages,such as natural energy,water flooding,and polymer flooding,leaving a complex distribution of residual oil and a pressing need to improve development efficiency.Therefore,Block Ⅲ was divided into three regions featured by:normal polymer flooding,casing-damaged polymer flooding,and polymer follow-up water flooding based on the study of residual oil and analysis results of development effectiveness,so as to develop proper technical strategies for improving development effectiveness with artificial core displacement and numerical simulation techniques.After years of chemical flooding,residual oil in the normal polymer flooding region is sporadically distributed at the edges of sand bodies and areas with low permeability.In the casing-damaged polymer flooding region,the producing performance of oil layers is poor due to casing damage,and the remaining oil reserves there is high.Based on the conditions described above,optimization is carried out in three aspects:development method,oil displacement system,and well pattern design with the full consideration of different regional characteristics.For normal polymer flooding regions and polymer subsequent water flooding regions,a five-spot well pattern dilution of regular polymer flooding was adopted with a well spacing of 175 meters and a plug size of 0.40 times of the pore volume.While for casing-damaged polymer flooding region,a local infilled five-spot well pattern of regular polymer flooding is applied with a well spacing of 140 meters and a plug size of 0.70 times of the pore volume.An increase of 3.53 percentage points is predicted in recovery rate.After the implementation of these measures,the cumulative injection of polymer pre-plugs in Block Ⅲ is estimated to be 0.10 times the pore volume,an expected oil increase of 9 780 tons.This study can provide reference for improving development efficiency in polymer flooding blocks.
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