页岩气现场解吸方法优化

Optimization of shale gas desorption method in field

俞凌杰 范明 蒋启贵 唐祺 张文涛 舒向伟

Yu Lingjie Fan Ming Jiang Qigui Tang Qi Zhang Wentao Su Xiangwei

中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126 2. 中国石化集团公司 油气成藏重点实验室, 江苏 无锡 214126 3. 中国石化 勘探南方分公司研究院, 成都 610041 4. 中国石化 江汉油田分公司 勘探开发研究院, 武汉 430223

Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China 2. SINOPEC Key Laboratory of Petroleum Accumulation Mechanisms, Wuxi, Jiangsu 214126, China 3. SINOPEC Exploration Southern Company, Chengdu, Sichuan 610041, China 4. Research Institute of Petroleum Exploration and Development, Jianghan Oilfield Company, SINOPEC, Wuhan, Hubei 430223, China

利用自行研制的智能化页岩气现场解吸仪对现有常规解吸方法进行优化,提出以110 ℃作为二阶解吸温度并形成高温快速解吸方法,可将解吸时间从40 h以上缩减至8 h左右,且可不再测试残余气,克服了常规解吸流程耗时长这一弊端。流程中增设了"T"字型铜制冷凝管,并辅以石英砂充填,较大程度去除了水蒸气冷凝水堵影响。选择6组页岩岩心进行高温快速解吸和常规慢解吸平行测试对比,结果显示2种方法含气量数据差值波动范围小于0.15 m3/t,且主要源于页岩取样的非均质性,同时高温快速解吸结果与不同深度录井气测变化规律一致。研究结果表明,优化后的高温快速解吸方法效率高,数据可靠,可满足密集取心测试,有助于提高页岩气资源评价的准确性。

This paper optimized conventional shale gas desorption method by applying 110 ℃ as second stage desorption temperature with self-designed smart desorption apparatus. The proposed rapid method largely increased efficiency by reducing desorption time from more than 40 h to 8 h approximately and avoiding residual gas test. Water steam blocking problem was avoided by using "T" type bronze condensation tube and quartz sand filling. Six group of shale samples were selected to compare rapid and conventional desorption method. The result showed that the data difference was smaller than 0.15 m3/t mainly from heterogeneity. In addition, the result of shale gas content exhibited the same trend as well logging. The study shows that the rapid method could obtain reliable results with high efficiency and could meet the demand of intensive tests to improve accuracy of resources estimate.

中国石化科技部项目(P12002,P14156)资助.

https://doi.org/10.11781/sysydz201503402