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中国低渗透油藏储量资源丰富,是目前油田增储上产的主要阵地,开发潜力巨大。低渗透油藏由于存在启动压力,具有渗透率低及传导速率慢等特性,其开发和评价方法不同于常规油藏。在低渗透油藏开发中常用启动压力梯度来计算最大注采井距和注水见效时间等,并且常用岩心分析法来确定低渗透油藏的启动压力梯度,但岩心分析法确定启动压力梯度的随机性大且代表性差。同时低渗透油藏多采用压裂投产,压裂井的压裂效果难以定量评价,压裂特征参数及压裂裂缝方位用常规方法难以确定。本文基于试井分析理论,探讨了利用试井资料确定低渗透油藏启动压力梯度、评价压裂效果和判断裂缝方位的方法。
China is rich in reservoirs of low-permeability reservoirs, which is the main front for the oilfield to increase production and reserves and has great potential for development. Low permeability reservoirs are different from conventional reservoirs in the development and evaluation methods because of their starting pressure, low permeability and slow conduction rate. Starting pressure gradients are commonly used in the development of low permeability reservoirs to calculate the maximum injection well spacing and injection effective time, and core analysis is often used to determine the start-up pressure gradient of low permeability reservoirs. However, the core analysis method determines the starting pressure gradient at random Large and poor representation. At the same time, many fractures are put into operation in low-permeability reservoirs, fracturing effect of fracturing wells is hard to quantitatively evaluate, fracturing characteristic parameters and fracturing fractures orientation are difficult to determine by conventional methods. Based on the well test analysis theory, this paper discusses how to determine the start-up pressure gradient, evaluate the fracturing effect and determine the fracture orientation using well test data.