石油勘探与开发 >

2020 , Vol. 47 >Issue 2: 409 - 415

DOI: https://doi.org/10.11698/PED.2020.02.20

石油工程

低渗透油藏直井体积压裂改造效果评价方法

  • 张安顺 ,
  • 杨正明 ,
  • 李晓山 ,
  • 夏德斌 ,
  • 张亚蒲 ,
  • 骆雨田 ,
  • 何英 ,
  • 陈挺 ,
  • 赵新礼
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  • 1. 中国石油勘探开发研究院渗流流体力学研究所,北京 100083;
    2. 中国科学院渗流流体力学研究所,河北廊坊 065007;
    3. 新疆油田公司勘探开发研究院,新疆克拉玛依 834000
张安顺（1994-）,男,新疆克拉玛依人,中国石油勘探开发研究院在读硕士研究生,主要从事数值模拟及压裂效果评价研究。地址：北京市海淀区学院路20号,中国石油勘探开发研究院渗流流体力学研究所,邮政编码：100083。E-mail：zhanganshun@petrochina.com.cn

收稿日期: 2019-06-26

  修回日期: 2020-01-09

  网络出版日期: 2020-03-21

基金资助

国家科技重大专项（2017ZX05013-001）; 中国石油天然气集团有限公司重大基础科技攻关课题"致密油藏物理模拟方法与开采机理研究"（2018B-4907）

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An evaluation method of volume fracturing effects for vertical wells in low permeability reservoirs

  • ZHANG Anshun ,
  • YANG Zhengming ,
  • LI Xiaoshan ,
  • XIA Debin ,
  • ZHANG Yapu ,
  • LUO Yutian ,
  • HE Ying ,
  • CHEN Ting ,
  • ZHAO Xinli
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  • 1. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;;
    2. Institute of Porous Flow and Fluid Mechanics, University of Chinese Academy of Sciences, Langfang 065007, China;
    3. Research Institute of Petroleum Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, China

Received date: 2019-06-26

  Revised date: 2020-01-09

  Online published: 2020-03-21

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摘要

为评价低渗透油藏直井体积压裂改造效果及其动态变化过程,建立了油水两相渗流模型和井模型,在此基础上提出了基于生产数据及压裂液返排数据的改造效果评价方法,并进行了矿场实例分析。将压裂后主裂缝附近区域划分为不同的改造区域,用改造区域渗透率和面积分别表征压裂后缝网的改造强度和规模,并将改造区域导流能力定义为改造区域渗透率与面积的乘积。进行了参数敏感性分析,发现裂缝半长和核心区域渗透率主要影响近井端流体流动规律,即生产早期规律,基质渗透率主要影响裂缝远端流体流动规律。以长庆油田典型老井为例,评价了该井两轮次体积压裂后的压裂改造效果及其变化,发现第1次体积压裂后随着生产时间的增加,改造区域渗透率和导流能力逐渐降低,压裂效果逐渐变小直至消失;第2次体积压裂后,改造区域渗透率及导流能力又大幅增加。图12表2参30

关键词： 体积压裂; 压裂效果评价; 压裂改造区域; 导流能力; 低渗透油藏; 直井

本文引用格式

张安顺 , 杨正明 , 李晓山 , 夏德斌 , 张亚蒲 , 骆雨田 , 何英 , 陈挺 , 赵新礼 . 低渗透油藏直井体积压裂改造效果评价方法[J]. 石油勘探与开发, 2020 , 47(2) : 409 -415 . DOI: 10.11698/PED.2020.02.20

Abstract

To evaluate the fracturing effect and dynamic change process after volume fracturing with vertical wells in low permeability oil reservoirs, an oil-water two-phase flow model and a well model are built. On this basis, an evaluation method of fracturing effect based on production data and fracturing fluid backflow data is established, and the method is used to analyze some field cases. The vicinity area of main fracture after fracturing is divided into different stimulated regions. The permeability and area of different regions are used to characterize the stimulation strength and scale of the fracture network. The conductivity of stimulated region is defined as the product of the permeability and area of the stimulated region. Through parameter sensitivity analysis, it is found that half-length of the fracture and the permeability of the core area mainly affect the flow law near the well, that is, the early stage of production; while matrix permeability mainly affects the flow law at the far end of the fracture. Taking a typical old well in Changqing Oilfield as an example, the fracturing effect and its changes after two rounds of volume fracturing in this well are evaluated. It is found that with the increase of production time after the first volume fracturing, the permeability and conductivity of stimulated area gradually decreased, and the fracturing effect gradually decreased until disappeared; after the second volume fracturing, the permeability and conductivity of stimulated area increased significantly again.

Key words： volume fracturing; fracturing effect evaluation; fracturing area; conductivity; low permeability reservoir; vertical well

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