摘要
压裂井裂缝参数是决定压裂效果最主要的因素,优选压裂参数可以提高效益,节约成本。以长庆油田某区块菱形反九点井网为例,应用低渗透地层油水两相流数学模型,采用数值模拟方法,模拟计算不同裂缝参数组合、不同生产时间下的原油累计采出程度,详细分析了水力压裂采出程度与裂缝参数、井网形式、时间的关系。通过对比发现:在短期内获得最大的采出程度,增加边井裂缝半长是必要的;在压裂生产中后期,边井的裂缝会引起注入水的浸入,原油产量下降,含水率急剧上升,同时由于注入水大部分从边井流出,使角井无法得到注水井的影响,从而角井产量也大幅度下降,因此要在中长期获得最大的采出程度,需边井取较短的裂缝半长,角井取较大的裂缝半长。该结论为压裂参数优化提供了新的认识。
Fracture parameter of fractured well is the most important factor to determine the fracturing effect and it can be optimized to improve the cost-effectiveness.Taking the diamond shaped inverted nine spot pattern in a block of Changqing Oilfield as an example,based on the mathematical model of oil-water two-phase flow of low permeability reservoir,the cumulative degree of reserves recovery of crude oil is simulated under the conditions of different fracture parameters and different production time in this paper.The paper analyzes the relationship between the reserves recovery degree of hydraulic fracturing and fracture parameter,spacing pattern and time.The comparison results show that it is necessary to increase the half fracture length of edge well in order to access the maximum degree of reserves recovery in a short time.At the intermediary and later stage of fracturing operation,the fracture of edge well may give rise to the invasion of injected water,resulting in crude output decline and the rapid rising of water cut.At the same time,as most of injected water flows out from edge well,corner well can not be affected by injection well,causing the precipitous decline of production rate in corner well.Therefore,a short half fracture length needs to be adopted for edge well,a long half fracture length for corner well,in order to acquire the maximum degree of reserves recovery in a long term.This conclusion provides new recognition for the optimization of fracture parameters.
出处
《断块油气田》
CAS
北大核心
2010年第6期762-764,共3页
Fault-Block Oil & Gas Field
基金
湖北省高等学校优秀中青年团队计划项目"低渗透油气井动态仿真与决策技术"(T200803)
关键词
菱形反九点
裂缝参数
角井
边井
水力压裂
diamond shaped inverted nine spot pattern
fracture parameter
corner well
edge well
hydraulic fracturing.
