With the increase of angle between the horizontal well and the horizontal direction, the water breakthrough time shortens in five-spot well pattern, firstly increases and then decreases in seven-spot pattern, and increases in nine-spot pattern. 随水平井与水平方向夹角的增大,五点法井网的见水时间缩短,七点法井网的见水时间先增加后缩短,九点法井网的见水时间增加;
The inverted nine-spot rhombus pattern has two adjustable directions of well array. 菱形反九点井网有两个可调的井排方向,是适合于裂缝和砂体方向性明显油藏的最佳井网。
Conclusion By adopting skewed nine-spot pattern, leading water injection, clay stabilizer and wettability reversal, development effect of Chang 8 reservoir may be improved. 结论采用菱形反九点井网实施超前注水开发,并在注入水中添加黏土稳定剂和润湿性反转剂可以改善长8油藏的开发效果。
Numerical simulation of integrated fracturing project are completed by using three-dimension black oil model, production performance are predicted with favorable and unfavorable situation at inverted nine-spot and five-spot well pattern. 以三维黑油模型为基础,进行整体压裂方案数值模拟,给出了不同井网模式下裂缝有利和不利状态的生产动态预测曲线。
Adjusted the well pattern from inverted nine-spot to five-spot will improve the oil production and recovery. 将反九点井网调整为五点井网可以提高油田开发效果;
Under the same well space and production conditions, the water breakthrough time of five-spot pattern is longer than that of seven-spot and nine-spot pattern. 相同的井距和生产条件下,五点法井网的见水时间要长于九点法和七点法井网;
We have analyzed the method of identifying rational well spacing density. On the foundation of economic analysis, we have compared and evaluated three kinds of methods ( rectangular, square reverse nine-spot and rhombus reverse nine-spot) about pattern arrangement and pattern modification. 分析了合理井网密度的确定方法,以经济分析为基础对比评价了矩形、正方形反九点、菱形反九点等三种井网部署和井网调整方法。
The recommended scheme was inter-well infill, inverted nine-spot gas injection; gas injection pressure being above 30MPa; the flowing pressure in oil well being controlled at about 23 MPa; synchronous and continuous gas injection. 推荐方案为:井网加密方式采用井间加密,反九点法同步连续注气;注气压力为30MPa以上;采油井流压控制在23MPa左右。
In the initial stage of development, the inverted nine-spot pattern has been used widely. 开发初期大多采用了正方形,九点井网注水方式开发。