Feasibility study of network fracturing for high differential stress fractured reservoir and application

doi:10.3969/J. ISSN.1006-768X.2019.04.14

Drilling & Production Technology ›› 2019, Vol. 42 ›› Issue (4): 50-53.DOI: 10.3969/J. ISSN.1006-768X.2019.04.14

• PRODUCTION TECHNOLOGY • Previous Articles Next Articles

Feasibility study of network fracturing for high differential stress fractured reservoir and application

1 . Drilling & Production Technology Research Institute of Qinghai Oilfield Company, Dunhuang, Ganshu 736200, China; 2. Service Supervision Company of Qinghai Oilfield Company, Dunhuang, Ganshu 736200, China

Online:2019-07-25 Published:2019-07-25
Supported by:

高应力差裂缝储层缝网压裂技术可行性研究及应用

张勇，王志晟，甘宇明，何金鹏，雷丰宇，郭子义

1 青海油田分公司钻采工艺研究院 2 青海油田分公司监督监理公司

作者简介:张勇( 1985 - ) , 工程师, 理学学士, 2008 年毕业于长江大学地球化学专业, 主要从事油田措施改造工艺研究及现场试验。地址: ( 736202) 甘肃省敦煌市七里镇青海油田钻采工艺研究院, 电话:18997371585, E-mail:51898111 @ qq. com
基金资助:
中国石油天然气股份有限公司“ 十三五” 重大专项“ 柴达木盆地建设高原大油气田勘探开发关键技术研究与应用” 下课题四“ 柴达木盆地老油区精细调整及提高采收率关键技术研究” ( 项目编号 2016E - 01 )

Abstract

Abstract: Many reservoirs have characteristics of high in stress difference and natural fracture development in Qaidam Basin. Feasibility study of network fracturing was then proposed for such reservoirs. By analyzing the stress state, the fracture initiation condition of nature fracture are studied, and mathematical model of tensile initiation and shear initiation is established. Principal of stress difference and net pressure effects on shear initiation of nature fractures are obtained by model calculation and uni-variate analysis. When hydraulic fractures encounter natural cracks, increasing the net pressure of hydraulic fracture promoted the opening of natural fractures within a wider angle range. As the maximum and minimum stress differences increase, the fracture net pressure causing shear failure of natural cracks is reduced. According to the above conclusion, multi stage pulse temporary plugging technology was ever used to increase the net pressure of hydraulic fractures. By the G function analysis of the pressure drop curve it is shown that multiple fractures are opened during the fracturing, and the feasibility of network fracturing is verified.

Key words: , high stress difference, fractured reservoir, in-fissure net pressure, network fracturing

摘要： 柴达木盆地内多个油田储层具有主应力差值大、天然裂缝发育等特点。针对上述储层，文章提出了高应力差裂缝储层缝网压裂的可行性研究。采用应力分析方法，研究了天然裂缝的起裂条件，同时建立了天然裂缝张性起裂和剪切起裂的数学模型。通过模型计算和单因素分析方法，给出了主应力差、缝内净压力对天然裂缝剪切破起裂影响规律：水力裂缝遇到天然裂缝时，提高缝内净压力可以促使更广泛角度的天然裂缝开启；随着最大、最小应力差增加，使天然裂缝发生剪切破坏所需要的缝内净压力降低。根据上述结论，在某高应力差裂缝发育储层，采取多级脉冲暂堵提高缝内净压力的工艺措施。施工结果和压降曲线Ｇ函数分析显示，压裂施工过程出现了多裂缝开启的现象，验证了高应力差裂缝储层进行缝网压裂的可行性。

关键词: , 高应力差；裂缝储层；缝内净压力；缝网压裂

CLC Number:

张勇, 王志晟, 甘宇明, 何金鹏, 雷丰宇, 郭子义. 高应力差裂缝储层缝网压裂技术可行性研究及应用[J]. 钻采工艺, 2019, 42(4): 50-53.

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Feasibility study of network fracturing for high differential stress fractured reservoir and application

高应力差裂缝储层缝网压裂技术可行性研究及应用

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