| 泡沫压裂液添加剂对煤层甲烷扩散影响的分子模拟 |
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| 引用本文： | 杨兆中,韩金轩,张健,何睿,路艳军,李小刚.泡沫压裂液添加剂对煤层甲烷扩散影响的分子模拟[J].煤田地质与勘探,2019,47(5):94-103. |
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| 作者姓名： | 杨兆中 韩金轩 张健 何睿 路艳军 李小刚 |
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| 作者单位： | 西南石油大学油气藏地质及开发工程国家重点实验室;莫斯科国立罗蒙诺索夫大学地质系;中联煤层气有限责任公司 |
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| 基金项目： | 国家科技重大专项任务（2016ZX05044-004-002） |
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| 摘 要： | 利用分子模拟软件Materials Studio（MS）建立了一定温度、压力条件下，考虑含水煤层、泡沫压裂液起泡剂、稳泡剂相互作用的狭缝孔分子模拟模型。基于分子扩散理论计算并评价了分别在常见的4种起泡剂以及4种稳泡剂影响下的甲烷分子扩散能力大小。结果表明，与原始含水煤层相比，加入起泡剂十二烷基磺酸钠、十二烷基硫酸钠、十二烷基苯磺酸钠和甜菜碱后，甲烷自扩散系数分别降低了71.3%、74.7%、56.3%和54.0%。相比于仅加入起泡剂（十二烷基苯磺酸钠）的情况下，加入稳泡剂聚丙烯酰胺、聚乙烯醇、聚乙二醇和羧甲基纤维素后，甲烷自扩散系数分别降低了63.2%、57.9%、55.3%和71.1%。据此可知，起泡剂是降低含水煤层中甲烷扩散能力的主要因素，而稳泡剂的使用会进一步降低甲烷扩散能力。在起泡剂和稳泡剂的共同影响下，甲烷自扩散系数降低超过了80%，这对煤层气产出极为不利。建议在保证泡沫压裂液泡沫性能前提下，通过优化起泡剂分子结构、减少用量以减小起泡剂和稳泡剂对甲烷扩散的影响，并尽量避免使用大分子稳泡剂。
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| 关 键 词： | 煤层气 泡沫压裂液 分子模拟 起泡剂 稳泡剂 扩散系数 |
| 收稿时间： | 2019-03-11 |
Molecular simulation of the influence of foam fracturing fluid additives on coalbed methane diffusion |
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| Abstract: | Materials Studio(MS) software was used to establish a slit pore molecular model which considers the in-teractions among water-bearing coal, foam agent and foam stabilizer. Based on molecular diffusion theory, the diffusion ability of methane molecule respectively affected by four common foam agents and four foam stabilizers was calculated. Compared to original water-bearing coal, self-diffusion coefficient of coalbed methane(CBM) is reduced by 71.3%, 74.7%, 56.3%, 54.0% after adding foaming agents including sodium dodecyl sulfonate(SDS), sodium lauryl sulfate(SLS), sodium dodecyl benzene sulfonate(SDBS) and lycine respectively. Based on adding SDBS into water-bearing coal, the self-diffusion coefficient of CBM is further reduced by 63.2%, 57.9%, 55.3% and 71.1% after adding PAM, PVA, PEG and CMC respectively. It shows that foaming agent plays the most important role in reducing diffusion ability of CBM, and the use of foam stabilizer can further decrease the diffusion ability. Influenced by foam agent and foam stabilizer simultaneously, the self-diffusion coefficient of CBM can even drop more than 80%, which is adverse to CBM exploitation. Consequently, foaming and stabilizing performance of foam fracturing fluid should be guaranteed and the formation damage should be reduced through improving the molecular structure of foam agent and controlling its usage amount. On the other hand, foam stabilizer is not recommended to be used in coalbed. |
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