各向异性油藏的矢量井网

由于储集层的各向异性,在注水保持地层能量的开发过程中,注入流体沿高渗透率方向优先推进,导致不同方向上的生产井见水时间差别较大,致使驱替过程很不均衡,从而影响油藏开发效果.针对上述问题,提出了矢量开发思想,并基于渗流力学理论,以五点井网为例,建立了矢量井网设计方法,其中包括矢量井网中的井网方向计算模型和方向井距的确定途径.各向异性油藏中,井网方向应随各向异性程度进行调整.胜利油田桩106块油田开发实例证实了矢量井网设计模型的可靠性.图3表1参13

Vectorial well arrangement in anisotropic reservoirs

Due to the anisotropy of reservoirs, the injected fluid flows preferentially along the high permeability direction when water injection is used to retain the formation energy in the reservoir development. This would cause that the water breakthrough times for production wells in different directions are obviously different from each other and the process of displacement is unbalanced. Consequently, the effect of reservoir development is badly influenced. The vectorial development idea is put forward to solve the above problem. With the five-spot well arrangement as an example, the design method of vectorial well arrangement is presented based on the percolation mechanics theory, including the calculation model for the direction of vectorial well arrangement and the means of determining the directional well-space. The well arrangement direction for an anisotropic reservoir should be adjusted according to the anisotropy degree of the reservoir. The reliability of the design model is confirmed by its practical application in the Shengli Oilfield.