缝洞型油藏油井产能分析

缝洞型油藏主要由溶洞、裂缝构成,具有较强的非均质性和丰富的储集空间,对其进行产能分析一般较为困难。根据等效连续介质理论,通过对基质、溶洞和裂缝3种区域进行不同的排列组合,建立了6种缝洞型油藏单井产能方程;并根据某油井实际的生产数据,计算得到6种缝洞型油藏的单井产量,并对其进行对比分析;进而讨论了溶洞半径、溶洞渗透率、裂缝宽度和裂缝渗透率这4个因素对单井产能的影响。分析后认为：溶洞区域接近井筒时的产量更高,并且此时溶洞半径和渗透率对产量的影响要比基质区域接近井筒时的影响要大;当裂缝区域接近井筒时,裂缝宽度和渗透率对产量的影响要比基质区域接近井筒时的影响要大。

Productivity analysis of single well in fractured-vuggy reservoir

The fractured-vuggy carbonate reservoir is mainly composed of fracture and vug.It has stong heterogeneity and rich reservoir space,so it is generally more difficult to analyze productivity.Bsaed on the equivalent continuous medium theory and by ranging the matrix,vugs and fratures,the single well productivity equations of fractured-vuggy reservoir under the six reservoir conditions are established.And based on the actual production data in an oil well,this paper calculates the oil production of single well from the six reservoirs and comparatively analyzes the six kinds of production.The four influence factors of vug radius,vug permeability,fracture width and fracture permeability on the single well productivity are discussed.After analysis,it is considered that the production is more high when karst vug area is close to wellbore.At this time,the influence of vug radius and permeability on production is greater than that when matrix area is close to wellbore.When fracture area is close to wellbore,the influence of fracture width and permeability on production is greater than that when matrix area is close to wellbore.