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沁水盆地潘河区块煤层气井负压抽采增产效果
Stimulation Effect of negative pressure extraction for CBM wells, Panhe block,Qinshui Basin
李 娜 冯汝勇 柳迎红 刘 佳 廖 夏
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作者单位:中海油研究总院有限责任公司
中文关键字:煤层气 产量衰减 生产压差 负压抽采 等温吸附 敏感解吸阶段
英文关键字:CBM; Production decline; Production pressure difference; Negative pressure extraction; Isothermal adsorption; Sensitive desorption stage
中文摘要:潘河区块煤层气井经过数十年的勘探开发已进入开发后期,产量持续衰减,难以通过排水降压方式提产。因此,基于等温吸附理论,分析了不同解吸阶段煤层气解吸速率,提出采用井口安装压缩机的新型开发方式,通过负压抽采降低井筒压力扩大生产压差,提高煤层气井开发后期产量。结果表明:①通过煤层气等温吸附曲线曲率函数将煤层气的等温吸附划分为低效解吸、缓慢解吸、快速解吸和敏感解吸4 个阶段,在敏感解吸阶段,煤层气井解吸效率最高,产气量上升最快;②负压抽采井需满足储层条件好、剩余资源丰富,前期排采效果好,产量衰减明显、煤层裸露等条件;③潘河区块多数煤层气井井底流压处于敏感解吸阶段,通过负压抽采方法进一步降低井底流压,产量提升明显。
英文摘要:After decades of exploration and development, most coalbed methane (CBM) wells, Panhe block, Qinshui Basin, have moved into the late stage of development. And their production declines continuously and can be hardly increased by means of drainage and pressure reduction. So, the desorption rate in different desorption stages was studied based on the theory of isothermal adsorption. Moreover, a new method of installing a compressor at wellhead was proposed. That is to apply the negative pressure extraction to reduce wellbore pressure and increase production pressure difference, so as to increase the production of CBM wells in the late stage of development. Results show that (1) based on the curvature function of isothermal adsorption curve, isothermal adsorption can be divided into four stages, including low-efficiency desorption stage, and slow, rapid, and sensitive desorption stages. And in the sensitive  desorption stage, CBM wells have the highest desorption efficiency and the fastest production increase; (2) the negative pressure extraction wells shall satisfy following requirements, e.g. good reservoir conditions, abundant residual resources, good production effect in the early stage, obvious production decline, and exposed coal seams; and (3) for most CBM wells, Panhe block, the bottomhole flowing pressure is during sensitive desorption, so by means of negative pressure extraction, this flowing pressure can be reduced further and the production can be increased significantly.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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