基于裂缝模型的水平井方位优化——以A气藏为例

Orientation Optimization of Horizontal Well Based on Fracture Model—A Case of A Gas Reservoir

在油气田开发过程中,对于低渗、致密的储层,水平井井眼方位需要考虑的因素复杂。为了搞清水平井最优方位,本文针对水平井与最大主应力夹角对最终产能的影响,使用基于天然裂缝和人工裂缝一体化模型的水平井方位优化方法,开展离散裂缝网络模型构建、压裂缝动态模拟、产能评价等工作,模拟5种不同水平井方位的产能潜力,进而优选最优水平井方位。结果表明走向与水平最大主应力方向一致、高角度天然裂缝更容易受到压裂改造;天然裂缝发育的区域,当水平井段与水平最大主应力夹角为75°时,压裂对储层的改造作用最大、最终产能最高。此成果为后期同类型油气藏水平井方位部署提供了合理建议,对促进水平井高效开发具有指导意义。

In the process of oil and gas field development,for low-permeability and tight reservoirs,the factors that need to be considered in the well bore orientation of horizontal wells are complex.In order to find out the optimal orientation of horizontal wells,aiming at the influence of the angle between horizontal wells and the maximum principal stress on the final productivity,the orientation optimization method of horizontal wells based on the integrated model of natural fractures and artificial fractures was used to build the discrete fracture network model and carry out fracturing dynamic simulation,productivity evaluation and other work,simulate the productivity potential of five different horizontal well orientations,and then optimize the optimal horizontal well orientations.The results show that:The trend is consistent with the direction of the horizontal maximum principal stress,and the high angle natural fractures are more likely to be fractured.In the area where the natural fractures develop,when the angle between the horizontal well section and the horizontal maximum principal stress is 75 degrees,the fracturing will change the reservoir and the production capacity is the highest.This result can provide reasonable suggestions for the arrangement of horizontal wells in the later stage of the same type of oil and gas reservoir,and has guiding significance for promoting the efficient development of horizontal wells.