濮城油田低渗透砂岩油藏斌发主要机理及合理井距分析

低渗透油田开发效果比初期预测效果变差的原因：一是由于地层压力下降，净上覆压力相对增加而引起渗透率降低；二是储集层流态由拟达西渗流变为低速高阻非达西流。根据濮城油田低渗透油藏实际，定义了技术极限井距概念；根据渗流流量方程和流速方程，结合室内实验模型(临界驱替压力梯度)和现场资料，确定了技术极限井距计算公式，以濮城油田沙三上濮67块进行试算，计算结果比较合理。

The Main Challenges and the Reasonable Well Spacing for the Development of Low-permeability Sandstong Reservoirs in Pucheng Oilfield

Development effect of low-permeability oil field is getting worse than expectation result in the early days of oilfield development,dve to the fact that permeability decreases caused by formation pressure decreasing and overburden static pressure relatively increasing;and reservoir flow state changes form pseudo-Darcy flow according to actual conditions of low-permeability reservoirs of Pucheng oil field,deflition on the conception of technical limit well spacing was givenland in the light of folw rate and flow verlocity equations of filtrate and experimental model(critical displacement pressure gradient)established by lad test and in-situdata,an equaition was used for calculating technical licit well spacing of Unit 67 of Pucheng oil field,Pucheng oil complex,and reasonable calculation results were obtained.