基于均衡驱替的低渗透油藏直井压裂缝长优化方法

发布时间：2018-05-15 04:08

本文选题：低渗透油藏 + 矩形五点井网　；参考：《油气地质与采收率》2017年06期

【摘要】：目前,大多数油田采用相对规则的面积井网进行开发,受储层非均质的影响,各油田开发效果差异大。为此,提出对位于渗透率低值区的采油井进行人工压裂的方法,以达到井网均衡驱替的目的。以矩形五点井网为研究对象,推导出矩形五点井网内压裂井与未压裂井的见水时间计算公式;并以各采油井同时见水为目标,结合流线积分法和等效井径法,建立非均质油藏内位于渗透率低值区的压裂井的最优裂缝半长计算方法。通过分析储层渗透率级差、注采井距、注采压差差值及裂缝导流能力对压裂井最优裂缝半长的影响可知:最优裂缝半长随注采压差差值和裂缝导流能力的增大而减小;当储层渗透率级差和注采井距较大时,压裂井所需的最优裂缝半长也较大。
[Abstract]:At present, most oilfields are developed by relative regular area well pattern. Due to the influence of reservoir heterogeneity, the development effect of each oilfield varies greatly. In order to achieve the goal of balanced displacement of well pattern, a method of artificial fracturing for oil wells located in low permeability area is put forward. Taking the rectangular five-spot well pattern as the research object, the formula for calculating the water breakthrough time of the fracturing well and the non-fracturing well in the rectangular five-dot well pattern is derived, and the flow line integration method and the equivalent diameter method are combined with the simultaneous water discovery of each production well as the target. An optimal fracture half-length calculation method for fracturing wells in low permeability areas in heterogeneous reservoirs is established. By analyzing the effects of reservoir permeability differential, injection-production well spacing, injection-production pressure difference and fracture conductivity on the optimal fracture half-length of fracturing wells, it can be concluded that the optimal fracture half-length decreases with the increase of injection-production pressure difference and fracture conductivity. When the reservoir permeability differential and injection-production interval are large, the optimal fracture half length required for fracturing wells is also larger.
【作者单位】：中国石油大学(华东)石油工程学院;中国石化胜利油田分公司勘探开发研究院;
【基金】：国家科技重大专项“胜利油田特高含水期提高水驱采收率技术”(2016ZX05011-002)
【分类号】：TE348

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