| 鄂尔多斯盆地韩城区块煤层气老井挖潜技术及应用 |
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| 引用本文： | 王成旺,冯延青,杨海星,王伟,熊先钺,车延前.鄂尔多斯盆地韩城区块煤层气老井挖潜技术及应用[J].煤田地质与勘探,2018,46(5):212-218. |
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| 作者姓名： | 王成旺 冯延青 杨海星 王伟 熊先钺 车延前 |
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| 作者单位： | 中石油煤层气有限责任公司 |
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| 基金项目： | 国家科技重大专项课题（2016ZX05042-004） |
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| 摘 要： | 综合运用地质、压裂及排采动态等资料研究了韩城区块部分煤层气井低产原因，认为储层物性差、断层影响含气量和含气饱和度、多层开采临近水层被压裂沟通、开发井网不完善、越流补给导致储层不能有效降压、局部构造煤发育使煤层压裂造缝难度大并且排采煤粉堵塞渗流通道是造成煤层气井低产的主要因素。通过技术攻关，形成了跨层压裂、封层堵水、酸化解堵、修井工艺优化、加大排采强度等针对性的老井挖潜技术。通过现场试验表明，系列挖潜技术在韩城区块现场应用效果显著，有效提高了单井产气量，对该区块及其他类似地质条件区块的煤层气开发具有一定指导作用。
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| 关 键 词： | 低产井 不同因素 跨层压裂 封层堵水 酸化解堵 排采强度 |
| 收稿时间： | 2018-01-20 |
Potential-tapping technology and its application in old CBM wells in Hancheng block of Ordos basin |
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| Abstract: | Comprehensive analysis of geological, fracturing and dynamic drainage data of coalbed methane wells in Hancheng block was made to determine the causes of low productivity. It concludes that poor reservoir property, low gas content and gas saturation due to faults, incompleteness of development well patterns, insufficient pressure drop due to leakage recharge, difficulty in fracturing due to local development of tectonic coal, and seepage channel blockage due to coal powder are the main causes. Through technical research, a series of techniques of potential tapping were proposed, including indirect fracturing, water plugging, acid fracturing, optimization of workover technology, and increasing drainage intensity. Field test results in Hancheng show that these techniques have significant effect on improving gas production of CBM wells, and can be used to guide coalbed methane development in Hancheng and other blocks with similar geological conditions. |
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