| 天然气水合物储层超声雾化防砂排水采气实验研究 |
| 投稿时间：2021-08-28 修订日期：2022-05-06 点此下载全文 |
| 引用本文：罗强,刘志辉,宁伏龙,等.天然气水合物储层超声雾化防砂排水采气实验研究[J].钻探工程,2022,49(3):23-28.LUO Qiang,LIU Zhihui,NING Fulong,et al. Sand control and water drainage by ultrasonic atomization for gas recovery from hydrate reservoirs[J]. Drilling Engineering, 2022,49(3):23-28. |
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| 基金项目:国家重点研发计划项目“天然气水合物开采过程中井周储层动态响应行为与控制”（编号：2018YFE0126400）；国家自然科学基金资助项目“流固耦合作用下南海典型水合物储层力学劣化规律与机理研究”（编号：42006182）；广东省海洋经济发展（海洋六大产业）专项资金项目“南海泥质粉砂天然气水合物储层开采流固产出预测与控制技术研究”（编号：粤自然资合［2020］047号） |
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| 中文摘要:天然气水合物储层具浅埋藏、弱固结、低渗透、高泥质、非均质等特点，钻采过程中易出现严重的出砂问题，是制约天然气水合物安全高效开采的“瓶颈”之一。现有的天然气水合物储层防砂技术主要来源于常规油气开采中常用的防砂方法，防砂精度控制和稳产增产矛盾突出。为此，本文提出了一种天然气水合物储层超声雾化防砂排水采气方法，配合挡砂介质在有效防住10 μm以上砂的同时，将水雾化成5 μm左右的小水滴产出，降低水的携砂能力并加速水气产出，进而实现连续排水产气。基于该方法搭建了简易实验模拟评价装置，进行了初步的模拟实验。实验结果表明该方法具有一定的可行性，水气可以通过雾化片的锥孔不断产出。但是由于储层砂中还存在大量直径小于雾化片锥孔直径的泥质成分，雾化装置还需针对泥质成分的存在做进一步优化，否则泥质成分将堵塞在雾化片锥孔附近降低雾化片的振荡频率，造成排水产气的中止。这些初步的工作可以为天然气水合物储层防砂增产提供新的思路。 |
| 中文关键词:天然气水合物 储层防砂 排水 采气 超声雾化 |
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| Sand control and water drainage by ultrasonic atomization for gas recovery from hydrate reservoirs |
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| Abstract:Hydrate reservoirs have the characteristics of weak consolidation， high clay content and low permeability， which is prone to lead to serious problems of wellbore and reservoir instability, low gas production and sand production during drilling and production. Sand production is a bottleneck which restricts the safe and efficient exploitation of hydrate. The existing sand control technology of NGH reservoir mainly comes from the sand control methods commonly used in conventional petroleum exploitation， and the contradiction between sand control precision and permeability enhancement is prominent. This paper proposes a gas recovery method with ultrasonic atomization for sand control and water drainage for hydrate reservoirs， which can effectively block sand greater than 10 microns，and produce water in the form of mist with small droplets of about 5 microns， so as to realize continuous production of water and gas. Preliminary simulation experiments were carried out based on an experimental simulation evaluation device. Results show that the method is feasible and water mist can be produced continuously through the cone holes of the atomizing plate. However， the atomization device needs to be further optimized due to the presence of mud contents； otherwise the mud contents will seriously affect atomization. The preliminary work can provide a new idea for sand control and gas recovery enhancement in hydrate reservoirs. |
| keywords:hydrate sand control drainage gas production ultrasonic atomization |
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