水平注水井与直井联合井网见水时间研究

为了寻求一种简单、有效的计算水平注水井与直井联合井网的见水时间的方法,将水平井简化为具有等效井筒半径的直井,考虑水平井与直井联合布井水驱油的非活塞性,运用等值渗流阻力法将渗流区划分为3个阻力区,推导出了五点法、七点法和九点法水平井与直井联合井网的油井见水时间的计算公式和修正公式。计算结果表明,井网的见水时间随水平井长度的增加而缩短;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;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;油藏和流体参数对井网见水时间影响不大。

Water breakthrough time in combination well pattern of horizontal and vertical wells

In order to find out a simple and efficient method to calculate the water breakthrough time in combination well pattern of horizontal and vertical wells,simplifing a horizontal well into a vertical well with the same well-hole radius,and considering the unpiston-like displacement,the water breakthrough time formulas of five-spot,seven-spot and nine-spot pattern were derived and revised by equivalent percolating resistance method.In this method,the percolation region is divided into three resistance regions.The results show that the water breakthrough time shortens with the increase of the horizontal well length.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.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.The influence of reservoir and fluid parameters on the water breakthough time is little.