特低渗透油藏水平井开发参数优化

为了提高特低渗透油藏水平井的开发效果,针对志丹油田长6油藏的地质特征和水平井开发过程中出现的问题,开展了水平井开发技术和开发参数等研究工作,利用数值模拟优化研究得到如下认识:1)水平段长度与初产、现产、累产有比较明显的正相关性,但当水平段长度大于1 000 m时累产油增幅明显减小,综合考虑钻井和压裂成本,最优水平段长度...

The development parameter optimization of the horizontal well in ultra-low permeability reservoirs

In order to improve the development effect of horizontal well in ultra-low permeability reservoir,based on the Chang6 geological characteristics in Zhidan Oilfield and the problems that arise during the development of horizontal wells.In this paper,the development technology and development parameters of horizontal well are studied.Using the numerical simulation optimization research,it can obtain the following understanding:1)The length of horizontal section has obvious positive correlation with the initial yield,current yield and accumulated yield.However,when the length of horizontal section is greater than 1000 m,the increase of cumulative oil production decreases obviously.Taking into account drilling and fracturing costs,the optimal horizontal section length is 1000 m.2)The five-spot well pattern by simultaneous water injection is recommended.The optimal well spacing range is 500 m to 600 m and the optimal row spacing range is 100 m to 150 m.The initial injection allocation is suggested to be 15 m³/d to 20 m³/d,and the injection-production ratio should be maintained at about 2.0.This understanding has certain guiding significance for the efficient development of horizontal wells in ultra-low permeability reservoirs.