缝洞型油藏气驱动态空间结构井网构建方法

塔河缝洞型油藏注气开发取得了较好的增油效果，但不同气驱井组增油效果差异大，现场亟需气驱井网构建技术以指导现场注气，提高注气受效井组比例。但缝洞型油藏气驱井网如何构建、评价，目前尚没有公开报道。基于不同岩溶背景实际井网分析及注气波及规律的认识，明确了缝洞型油藏气驱动态立体空间结构井网构建原则。将气驱井网影响因素分为基础地质条件主控因素和气驱井网优劣主控因素，利用主成分分析法，明确了3大岩溶背景基础地质条件主控因素及评价方法，提出气驱控制程度、气驱动用程度、气驱动用储量、平面均衡驱替程度、纵向均衡驱替程度和注采层位交错程度等6大气驱井网优劣评价指标，基于6大因素对提高采出程度的影响，建立了气驱井网优劣评价方法及标准。考虑现场实际，提出气窜井组动态调整方法，并形成了缝洞型油藏气驱动态立体空间结构井网构建方法及流程。气驱井网构建方法应用于W-1实际气驱井组，该井组累计增油达6×10⁴ t，方气换油率达0.6 t，验证了该方法的可行性。

The Construction Method of Three-dimensional Dynamic Gas-driven Well Pattern in Fractured-vuggy Reservoirs

Gas injection in Tahe fracture-vuggy type reservoir has achieved good oil increase effect, but different gas driven well groups have great difference in oil increase effect, so gas driven well pattern construction technology is urgently needed to guide gas injection on site, so as to improve the proportion of gas injection affected well groups. However, there is no public report on how to construct and evaluate the gas driven well pattern. Based on the analysis of actual well pattern in different karst background and the understanding of gas injection and wave rule, the principle of constructing well pattern of gas-driven three-dimensional structure in fracture-vuggy reservoir is clarified. Factors influencing gas driven pattern can be divided into basic geological conditions factors and advantages and disadvantages of well pattern factors. Using the principal component analysis, basic geological conditions and the evaluation method of the three big background of karst has been established. We put forward the degree of gas driven control, gas drive utilization, gas driven the reserves, plane balanced degree of displacement, vertical displacement equilibrium degree and interleave degree of injection and production layers. Based on the six factors, effects on improving recovery degree, method and standard for quality evaluation of the influence of gas driven patterns. Considering the field practice, the dynamic adjustment method of gas channeling well group is proposed, and the well pattern construction method and flow chart of three-dimensional gas driven structure of fracture-vuggy reservoir are formed. The gas-driven well pattern construction method was applied to W-1 gas-driven well group, increased of 60, 000 tons of accumulated oil and the gas oil change rate of 0.6, verifying the feasibility of the method.