致密油藏水平井分段多簇压裂产能预测方法

收稿日期:20170109;改回日期:20170607 基金项目:国家科技重大专项“碎屑岩储层水平井压裂优化设计软件开发”(2016ZX05002-005-011) 作者简介:杨兆中(1969—),男,教授,博士生导师,1990年毕业于西南石油学院石油工程专业,1996年毕业于该校油气田开发工程专业,获博士学位,现从事低渗透油气藏增产改造理论、技术与油气藏数值模拟研究工作。DOI :10.3969/j.issn.1006-6535.2017.04.013

致密油藏水平井分段多簇压裂产能预测方法

杨兆中1,2,陈 倩1,2,李小刚1,

2(1.油气藏地质及开发工程国家重点实验室,四川 成都 610500;

2.西南石油大学,四川 成都 610500)

摘要:由于致密油藏在水平井分段压裂后形成复杂多簇缝网,为了正确表征缝网,更准确地预

测产能,根据等效渗流理论,基于Warren -Root 模型,将压裂后形成的分段多簇缝网等效为高

渗透带,并推导出等效渗透率及高渗透带宽度的关系式。在此基础上,应用复位势理论和势的

叠加原理,运用解析法建立了致密油藏分段多簇压裂水平井考虑裂缝间干扰的非稳态产能预

测模型。研究表明:致密油藏水平井日产量呈“L ”型递减,产量初期递减快,后期趋于平稳;实

例计算结果与实际产量接近,相对误差较小;高渗透带渗透率越大,长度越长,压裂水平井产能

越大,但基于经济技术等条件,各自存在最优值。该产能预测方法对致密油藏开发具有指导意

义。

关键词:致密油藏;水平井;分段多簇压裂;等效高渗透带;产能预测

中图分类号:TE348 文献标识码:A 文章编号:1006-6535(2017)04-0073-05

A Method to Predict Productivity of Multi -stage Multi -cluster Fractured Horizontal Wells in Tight Oil Reservoirs

Yang Zhaozhong 1,2,Chen Qian 1,2,Li Xiaogang 1,

2(1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ,Chengdu ,Sichuan 610500,China ;

2.Southwest Petroleum University ,Chengdu ,Sichuan 610500,China )Abstract :As a complex multi -cluster fracture network is formed after multi -stage fracturing of horizontal wells in

tight oil reservoirs ,the multi -stage multi -cluster fracture network is equivalent to a high permeability zone and the

formula between effective permeability and height of the high permeability zone is derived ,based on equivalent per-colation theory and Warren -Root model ,so as to accurately characterize fracture network and predict productivity.Based on this result ,complex potential theory and theory of potential superimposition ,a model is built to predict transient productivity of multi -stage multi -cluster fractured horizontal wells in tight oil reservoirs considering inter -fracture interference using analytical method.The research shows that the daily production of horizontal wells de-

clines in “L ”shape and production declines quickly in initial period and is stable in later period.Results of field

calculation are very close to actual production data ,with only a little https://www.360docs.net/doc/1b141692.html,rger permeability in high per-meability zone and larger length results in larger productivity of fractured -horizontal wells.However ,the parameter

has an optimum value as being limited by economics and technology.The productivity prediction method provides

guidance for the development of tight oil reservoirs.Key words :tight oil reservoir ;horizontal well ;multi -stage multi -cluster fracturing ;equivalent high permeability

zone ;productivity prediction 0 引 言

近年来,常规油气资源已进入难动用时期,开

发非常规油气资源已经成为各国的能源发展目标。中国致密油远景资源量约为50?108t ,具有巨大的开采潜力[1]。然而,致密油藏储层物性差,几乎无自然产能,目前常用开采模式为长水平段水平井+体积压裂。国内外油田实践证明,水平井分段多簇万方数据

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