考虑裂缝变导流能力的致密气井现代产量递减分析

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摘要针对水力压裂形成的裂缝导流能力会随空间以及时间发生变化这一特点,建立考虑裂缝空间、时间双重变导流和应力敏感效应的致密气压裂直井渗流的新型数学模型,采用混合有限元方法对模型进行求解,获得新模型的Blasingame现代产量递减分析典型曲线。以此为基础,讨论了裂缝空间、时间双重变导流及应力敏感效应对Blasingame曲线形态的影响。研究表明：空间变导流效应主要表现为降低早期典型曲线值;时间变导流效应会导致产量及产量积分曲线下掉,形成S型典型曲线;双重变导流则是两者效应的叠加;时间、空间变导流效应均不会延缓地层进入拟稳态阶段的时间。应力敏感会降低曲线值,但不会使得曲线陡降;应力敏感会延缓地层进入拟稳态阶段的时间。忽略变导流效应和应力敏感效应,不会对井控动态储量的计算结果产生较大影响,但会给裂缝、储集层参数解释带来较大误差。经苏里格气田致密气压裂井的常规现代产量递减分析与模型对比,证实新方法可靠实用,且比常规方法精度更高,可用于存在裂缝变导流致密气压裂井现代产量递减分析。图11表1参32

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关键词 ：致密气, 压裂, 现代产量递减分析, 裂缝导流能力, 空间变导流, 时间变导流, 应力敏感

Abstract：Considering the characteristics that the fracture conductivity of fracture formed by hydraulic fracturing varies across space and time, a new mathematical model was established for seepage flow in tight gas fractured vertical wells which takes into account the effects of dual variable fracture conductivity and stress sensitivity. The Blasingame decline curves of the model were obtained using the mixed finite element method. On this basis, the effects of conductivity varying with fracture space and time dual and stress sensitivity on Blasingame curve were analyzed. The study shows that the space variable conductivity mainly reduces decline curve value at the early stage; the time variable conductivity can result in drops of the production and the production integral curves, leading to a S-shaped curve; dual variable conductivity is the superposition of the effects given by the two variable conductivities; both time and space variable conductivities cannot delay the time with which the formation fluid flow reaches the quasi-steady state. The stress sensitivity reduces the curve value gradually rather than sharply, delaying the time the flow reaching the quasi-steady state. Ignoring the effects of variable conductivity and stress sensitivity will not affect the estimation on well controlled dynamic reserves. However, it can result in large errors in the interpretation of fractures and reservoir parameters. Practical advanced production decline analyses of a tight gas fractured well in the Sulige gas field showed that the new model is more effective and reliable than the conventional model, and thus it can be widely applied in wells with the same characteristics in other gas fields.

Key words： tight gas fracturing advanced production decline fracture conductivity space variable conductivity time variable conductivity stress sensitivity

收稿日期: 2017-10-11 出版日期: 2018-03-23

PACS:

TE332

基金资助:国家科技重大专项“超深层低渗气藏有效开发技术”（2016ZX05015-005）

通讯作者: 联系作者简介：欧阳伟平（1986-）,男,江西萍乡人,博士,中国石油川庆钻探长庆井下技术作业公司工程师,主要从事试井分析及储集层动态评价方面的研究工作。地址：陕西省西安市未央区凤城四路长庆大厦,邮政编码：710018。E-mail: ouywp56@163.com

作者简介: 孙贺东（1973-）,男,河北唐山人,博士,中国石油勘探开发研究院高级工程师,主要从事气井试井及产能评价方面的科研工作。地址：河北省廊坊市44号信箱,中国石油勘探开发研究院气田开发研究所,邮政编码：065007。E-mail: sunhed@petrochina.com.cn

引用本文:

孙贺东, 欧阳伟平, 张冕, 唐海发, 陈长骁, 马旭, 付中新. 考虑裂缝变导流能力的致密气井现代产量递减分析[J]. 石油勘探与开发, 0, (): 201809-201809.
SUN Hedong, OUYANG Weiping, ZHANG Mian, TANG Haifa, CHEN Changxiao, MA Xu, FU Zhongxin. Advanced production decline analysis of tight gas wells with variable fracture conductivity[J]. Petroleum Exploration and Development, 0, (): 201809-201809.

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