J-XC区块属于高孔高渗普通稠油油藏,油层埋藏浅、厚度薄,由于水驱过程黏滞阻力过大、水驱波及范围小、储层动用程度低、水驱采收率低,需转换开发方式,开展聚合物驱油方法提高采收率研究。在聚合物注入性评价的基础上,采用岩心流动实验和数值模拟方法开展聚合物驱注入参数和注采关系优化,对聚合物注入质量浓度、注入量、注入速度,以及井网井距、注采比等进行优化,从而获得最佳注入参数和注采关系。结果表明:聚合物相对分子质量为2 100×104、注入质量浓度为1 500 mg/L、注入量为0.400倍孔隙体积条件下,可保证聚合物的可注入性和高利用效率;油藏工程参数优化方案为采用五点法井网,合理注采井距为150 m,注入速度为每年注入0.070倍孔隙体积,不同厚度油层根据其最优单井日注入量配注,注采比为1.1~1.2。矿场先导试验表明,目标井组增油降水效果显著,截至2021年6月,累计注入聚合物0.228倍孔隙体积,累计增油量为5.06×104t,提高采收率6.75个百分点,含水率最高下降幅度达15.8个百分点。研究成果对于浅薄层普通稠油油藏聚合物驱参数优化和油藏工程设计具有借鉴意义。
Block J-XC is a common heavy oil reservoir with high porosity and permeability, shallow reservoir burial, and thin thickness. Due to high viscous resistance in the water flooding process, small effect range of water flooding, low reservoir productivity and low recovery rate by water flooding, it is necessary to change the development method and employ polymer flooding method to enhance the oil recovery. On the basis of polymer injectivity evaluation, the injection parameters and injection-production relationship of polymer flooding were optimized by core flow test and numerical simulation, including the mass concentration of polymer injection, injection volume, injection rate, well pattern, well spacing, injection-production ratio, so as to obtain the best injection parameters and injection-production relationship. The result shows that the injectivity and high utilization efficiency of the polymer were actualized under the conditions of 2 100×104 relative molecular mass of the polymer, 1 500 mg/L injection mass concentration and 0.400 times of pore volume; the optimal reservoir engineering parameters were a five-spot pattern, a reasonable injection-production well spacing of 150 m, an injection rate of 0.070 times the pore volume per year, and an injection ratio of 1.1 to 1.2 for different thicknesses of oil reservoirs according to their optimal single-well daily injection volumes. The pilot test in the field proves the significant effect of increasing oil and decreasing water cut in the target well cluster. As of June 2021, the cumulative injection rate of polymer is 0.228 times the pore volume, and the cumulative oil increase is 5.06×104t, the recovery factor is enhanced by 6.75 percentage points and the water cut is decreased by 15.8 percentage points. There is much for reference of the results to the optimization of polymer flooding parameters and reservoir engineering design in shallow ordinary heavy oil reservoirs.
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