注采井间连通裂缝参数干扰试井解释模型

Interference Well Test Interpretation Model for Injection-Production Inter-Well Connection Fracture Parameters

针对超低渗透油藏中注采井间裂缝参数难以确定问题,运用物质平衡原理和叠加原理等方法,建立了一种注水井与采油井井间连通裂缝参数干扰试井解释模型,得到了注水井井底压力解,并绘制了典型图版,典型图版曲线反应了3个主要的流动段:早期线性流、中期流和晚期径向流。将研究成果应用于华庆油田元284区块的庆平A1井组,对其进行试井解释,确定了元A1-43井与庆平A1井的第3条裂缝连通,井间连通裂缝长度为415m,井间裂缝无因次导流能力为8。该模型可以较为准确地计算出注采井间的裂缝参数,从而反映出有效的地层信息。研究内容可为超低渗透油藏注采井间裂缝性连通干扰试井解释提供理论依据。

The material balance,superposition and other principles were used to determine the injection-production inter-well fracture properties in the super-low permeability reservoir.An interference well test interpretation model for the injection-production inter-well connection fracture properties was established to gain the bottom-hole flowing pressure of water injection well.A typical plate was prepared,which reflects 3 major flow segments,including early linear flow,medium flow and late radial flow.This research was applied to the Wellgroup Qingping A1 in the Block Yuan284 of Huaqing Oilfield,which indicates that the third fracture between the Well YuanA1-43 and Well QingpingA1 is connected.The corresponding length of inter-well connection fracture is 415 m and the dimensionless conductivity is 8.This model can accurately calculate the injection-production inter-well fracture parameters to characterize the formation information.This research could provide certain theoretical basis for the interference well test interpretation of injection-production inter-well fracture connection in super-low permeability reservoir.