摘要
基于DST法和注入压降法在煤层气试井中的特点,利用煤层气试井专用设备对同一口井进行DST试井和注入压降试井,根据其工程实践结果,对比分析了两种方法在技术理论、专用设备实用性等方面的优缺点。分析结果显示:煤层气试井DST法具有测试成本低、测试的探测半径小、储层压力准确等特点,其专用设备具有操作简单、可靠性高等特点;煤层气试井注入压降法具有测试的探测半径大、可获得地层应力参数等特点,其专用设备具有适应性强、测试成功率高等特点;两种方法各有优势,可根据工程需求选择使用。
Based on characteristics of DST method and injection/pressure drawdown method in CBM well tests, using CBM well test spe- cific installations carried out testing using both methods in a same well. According to tested results, have comparatively analyzed the pros and cons of both methods on aspects of technical know-how, specific installation practicability etc. The ~＇esuh has shown that DST method has characteristics of low cost, small investigation radius, exact reservoir pressure, specific installation easy to operate and high reliability etc.; injection/pressure drawdown method has characteristics of large investigation radius, formation stress parameters available, specific installation well adapted, high rate of success etc. The two methods each has own advantages thus optional based on project requirements.
出处
《中国煤炭地质》
2015年第2期17-20,共4页
Coal Geology of China
基金
国家重大科技专项大型油气田及煤层气开发(煤矿区煤层气抽采产能预测技术2011ZX05040-003)
中煤科工集团西安研究院有限公司基金(煤层气井DST试井方法及设备研究项目2013XNPT002)
关键词
DST法
注入压降法
井下开关井
DST method
injection/pressure drawdown method
underground well switching
