低渗油田注水开发数值模拟研究
Numerical Simulation of Water Injection Development in Low Permeability Oilfield

本研究聚焦于低渗透性和超低渗透性油藏的注水开采技术，特别探讨了整体压裂技术在其中的运用。通过对区块的地质构造特征和储层特性的分析，建立了三维非均质地质模型，并进行了注水开发注入参数的优化研究。研究发现，五点井网法在提高采出程度方面表现最佳，因此被选为最优井网类型。通过数值模拟，确定了注入压力、注采比、注水强度、注水时机以及裂缝导流能力和裂缝半长等关键开发参数。结果表明，合理的注入压力为43 MPa，单井产液量为12 m³/d，注采比为1.3，裂缝导流能力为300 mD？m，裂缝半长为140 m，最佳穿透比为0.6。这些参数的优化有助于提升单井产量和经济效益，对超低渗透砂岩油藏的开发具有重要的理论支持和实践指导意义。
This study focuses on water injection production technology in low permeability and ultra-low permeability reservoirs, especially the application of integral fracturing technology in them. Based on the analysis of geological structure characteristics and reservoir characteristics of the block, a three-dimensional heterogeneous geological model is established, and the optimization of injection parameters for water injection development is carried out. The study found that the five-point pattern method performed best in improving the degree of production and was therefore selected as the optimal pattern type. Through numerical simulation, key development parameters such as injection pressure, injection-production ratio, injection intensity, injection timing, fracture conductivity and fracture half-length are determined. The results show that the reasonable injection pressure is 43 MPa, the fluid production per well is 12 m³/d, the injection-production ratio is 1.3, the fracture conductivity is 300 mD？m, the fracture half-length is 140 m, and the optimal penetration ratio is 0.6. The optimization of these parameters is helpful to increase the production and economic benefit of a single well, and has important theoretical support and practical guiding significance for the development of ultra-low permeability sandstone reservoirs.