复杂人工裂缝产状页岩气藏多段压裂水平井产能评价

doi:10.13809/j.cnki.cn32-1825/te.2023.04.007

油气藏评价与开发 ›› 2023, Vol. 13 ›› Issue (4): 459-466.doi: 10.13809/j.cnki.cn32-1825/te.2023.04.007

复杂人工裂缝产状页岩气藏多段压裂水平井产能评价

胡之牮¹(),李树新²,王建君³,周鸿⁴,赵玉龙¹(),张烈辉¹

1.西南石油大学油气藏地质及开发工程全国重点实验室，四川成都 610500
2.中国石油煤层气有限责任公司，北京 100028
3.中国石油浙江油田分公司，浙江杭州 310023
4.中国石油西南油气田分公司蜀南气矿，四川泸州 646001

收稿日期:2022-03-07 发布日期:2023-09-01 出版日期:2023-08-26
通讯作者: 赵玉龙（1986—），博士，研究员，主要从事非常规油气藏开发、数值模拟、试井分析等方面的科研与教学工作。地址：四川省成都市新都区新都大道8号，邮政编码：610500。E-mail：373104686@qq.com
作者简介:胡之牮（1998—），在读硕士研究生，主要从事油气藏渗流理论及应用研究。地址：四川省成都市新都区新都大道8号，邮政编码：610500。E-mail：178872337@qq.com
基金资助:
中国石油—西南石油大学创新联合体项目“川南深层与昭通中浅层海相页岩气整体动用理论与技术”(2020CX020202);中国石油—西南石油大学创新联合体项目“不同构型页岩储层流体流动规律及开发优化理论与方法”(2020CX030202);四川省杰出青年科技人才项目“深层海相页岩气藏流体赋存与传质机制研究”(2022JDJQ0009)

Productivity evaluation of multi-stage fracturing horizontal wells in shale gas reservoir with complex artificial fracture occurrence

HU Zhijian¹(),LI Shuxin²,WANG Jianjun³,ZHOU Hong⁴,ZHAO Yulong¹(),ZHANG Liehui¹

1. National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. PetroChina Coalbed Methane Company, Beijing 100028, China
3. PetroChina Zhejiang Oilﬁeld Company, Hangzhou, Zhejiang 310023, China
4. Shunan Division, PetroChina Southwest Oil & Gas field Company, Luzhou, Sichuan 646001, China

Received:2022-03-07 Online:2023-09-01 Published:2023-08-26

摘要/Abstract

摘要：

基于页岩气多重运移机制理论，针对页岩储层压裂裂缝呈现复杂形状和非均匀分布的实际情况，建立耦合了两类孔隙表观渗透率的页岩表观渗透率统一模型，另外，运用实空间源汇函数理论和压降叠加原理，建立了气藏—裂缝—井筒耦合渗流模型。模拟分析了页岩气微观渗流、裂缝形状和裂缝非均匀分布对产能的影响，结果表明：微观渗流对页岩气井产量的影响不可忽视，在生产初期考虑微观渗流的日产气量比不考虑微观渗流的日产气量高了20.3 %；复杂形状裂缝的产能比理想矩形裂缝的产能要低，其中星形裂缝的产能最低；裂缝的非均匀分布会影响水平井的产能，需选择最优布缝方式。研究模型综合考虑了页岩气的微观渗流机理和实际压裂裂缝情况，为页岩气藏压裂水平井产能研究提供了参考。

关键词: 页岩气, 表观渗透率, 压裂水平井, 复杂裂缝, 产能模型

Abstract:

Considering complex shape and non-uniform distribution of fracturing fractures in shale reservoir, on the basis of multiple migration mechanisms a unified apparent permeability model is developed, incorporating two types of pore apparent permeability based on multiple migration mechanisms. This model serves as the foundation for establishing a gas reservoir-fracture-wellbore coupled seepage model, utilizing real space source function theory and pressure drawdown superposition principle. Through simulations and analyses, the study investigates the effects of micro seepage, fracture shape and non-uniform distribution of fractures on shale gas productivity. The demonstrate that micro seepage significantly impacts shale gas well production, with daily gas production being 20.3 % higher when considering micro seepage during the initial stage compared to neglecting it. Furthermore, the productivity of wells with complex fractures is lower than that of wells with ideal rectangular fractures, and star-shaped fractures exhibit the lowest productivity. The non-uniform distribution of fractures also affects the productivity of horizontal wells, and an optimal fracture layout is identified. The model takes into account both the micro seepage mechanism and actual fracturing fracture of shale gas, providing valuable guidance for the productivity research of fractured horizontal wells in shale gas reservoir.

Key words: shale gas, apparent permeability, fractured horizontal well, complex fracture, productivity model

中图分类号:

TE328

胡之牮,李树新,王建君等. 复杂人工裂缝产状页岩气藏多段压裂水平井产能评价[J]. 油气藏评价与开发, 2023, 13(4): 459-466.

Zhijian HU,Shuxin LI,Jianjun WANG, et al. Productivity evaluation of multi-stage fracturing horizontal wells in shale gas reservoir with complex artificial fracture occurrence[J]. Petroleum Reservoir Evaluation and Development, 2023, 13(4): 459-466.

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参数	取值	参数	取值
井底流压/MPa	6	气藏长度/m	1 950
裂缝数量	7	气藏宽度/m	1 100
裂缝半长/m	150	气藏厚度/m	50
裂缝宽度/m	0.005	基质渗透率/10^-3 μm²	1×10^-5
裂缝高度/m	50	基质孔隙度	0.05
裂缝间距/m	200	气藏温度/K	353
裂缝导流能力/（10^-3 μm²·m）	0.2	原始地层压力/MPa	30

参数	取值	参数	取值
气藏长度/m	2 000	气藏温度/K	377
气藏宽度/m	500	原始地层压力/MPa	36
气藏厚度/m	30	井底流压/MPa	10
基质孔隙度	0.061	Langmuir压力/MPa	4.5
有机质占比	0.055	Langmuir体积/（m³/kg）	2.7×10^-3
综合压缩系数/MPa^-1	0.024	裂缝导流能力/ （10^-3 μm²·m）	0.15

复杂人工裂缝产状页岩气藏多段压裂水平井产能评价

Productivity evaluation of multi-stage fracturing horizontal wells in shale gas reservoir with complex artificial fracture occurrence

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