西南石油大学学报(自然科学版) ›› 2019, Vol. 41 ›› Issue (6): 132-138.DOI: 10.11885/j.issn.1674-5086.2019.11.17.01

• 页岩气开发专刊 • 上一篇    下一篇

页岩气藏压裂井产能评价及分析

胡德高1, 郭肖2, 郑爱维3, 舒志国3, 张柏桥1   

  1. 1. 中国石化江汉油田分公司, 湖北 潜江 433124;
    2. 油气藏地质及开发工程国家重点实验室·西南石油大学, 四川 成都 610500;
    3. 中国石化江汉油田分公司勘探开发研究院, 湖北 武汉 430223
  • 收稿日期:2019-11-17 出版日期:2019-12-10 发布日期:2019-12-10
  • 通讯作者: 胡德高,E-mail:304381508@qq.com
  • 作者简介:胡德高,1966年生,男,汉族,湖北天门人,教授级高级工程师,硕士,主要从事油气田开发理论研究与管理工作。E-mail:304381508@qq.com;郭肖,1972年生,男,汉族,陕西咸阳人,教授,博士生导师,主要从事非常规油气藏(酸性气藏、低渗透油气藏、凝析气藏、页岩气藏、裂缝性油气藏)开发渗流实验、渗流理论、数值模拟与应用技术研究。E-mail:750443669@qq.com;郑爱维,1984年生,男,汉族,湖北孝感人,副研究员,博士,主要从事页岩气气藏工程研究工作。E-mail:yjyzhawjhyt@sinopec.com;舒志国,1966年生,男,汉族,湖南桃源人,教授级高级工程师,博士,主要从事沉积储层和油气地质综合研究。E-mail:hxpphl@sohu.com;张柏桥,1963年生,男,汉族,湖北孝感人,教授级高级工程师,博士,主要从事页岩气开发研究工作。E-mail:zgfaini@126.com
  • 基金资助:
    国家科技重大专项(2016ZX05060);四川省科技计划重点研发项目(2018JZ0079);中国石化“十条龙”重大科技攻关项目(P18052)

Productivity Evaluation of Fractured Wells in Shale Gas Reservoirs

HU Degao1, GUO Xiao2, ZHENG Aiwei3, SHU Zhiguo3, ZHANG Baiqiao1   

  1. 1. Jianghan Oilfield Company, SINOPEC, Qianjiang, Hubei 433124, China;
    2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    3. Exploration and Development Research Institute, Jianghan Oilfield Company, SINOPEC, Wuhan, Hubei 430223, China
  • Received:2019-11-17 Online:2019-12-10 Published:2019-12-10

摘要: 页岩气储存在自生自储的纳米级孔隙中,压裂成为页岩气开发的重要技术。在考虑了多尺度非达西渗流机理的基础上,建立了多种流态多尺度渗流模型,求出考虑有限裂缝流动的页岩气藏压裂井稳态产能方程,在该模型中充分考虑了孔隙尺寸对Knudsen扩散系数的影响,并探索了滑脱现象、Knudsen扩散系数DK、渗透率K、裂缝半长Lf、裂缝穿透比Lf/Re与裂缝流动能力Kf·Wf对压裂井产能的影响规律。研究结果表明,渗透率修正因子ξ对产能的影响较大,以多尺度渗流模型确定的页岩气压裂井产能与实际生产数据非常稳合。当井底流压<15 MPa时,滑脱效应对压裂井产能的影响开始增强,并且随着滑脱因子增加,压裂井的产能随之增加;岩芯渗透率越低,Knudsen扩散系数DK和滑脱效应对产能影响越大。

关键词: 页岩气, 流动多尺度, Knudsen扩散系数, 渗透率修正因子, 压裂井

Abstract: Shale reservoir has nano-pores structure with self-generation and self-storage, so fracturing has become an important technology for shale gas exploitation. Based on the multi-scale non Darcy flow model, a multi-scale flow model is established to simulate various flow states including continuous flow, transition flow, slippage flow and free molecular flow. The steady-state production equation of fractured well with finite conductivity fracture is obtained. In this model, the influence of pore size on Knudsen coefficient is fully considered. The IPR curve of fractured well is obtained, and the effects of fracture half length, Knudsen diffusion coefficient, shale permeability, slippage factor, fracture penetration ratio and fracture conductivity on the production of fractured well are explored. The results show that the permeability correction coefficient has a great influence on productivity, and the productivity of fracturing well determined by multi-scale seepage model is very consistent with the actual production data. When the flow pressure in the bottom hole is less than 15 MPa, the slippage effect on production begins to increase in the fracturing well, and with the increase of slippage factor, the fracturing well production increases. The lower the permeability of shale gas reservoir, the greater Knudsen diffusion coefficient DK and slippage effect on production.

Key words: shale gas, multi-scale flow, Knudsen diffusion coefficient, permeability correction coefficient, fracturing well

中图分类号: