| 任小庆.抗高温泡沫钻井液体系评价研究[J].地质与勘探,2021,57(2):423-429 |
| 抗高温泡沫钻井液体系评价研究 |
| Evaluation of the high temperature-resistant foam drilling fluid system |
| 投稿时间：2020-10-24 修订日期：2021-01-11 |
| DOI：10.12134/j.dzykt.2021.02.017 |
| 中文关键词: 地热 地热井 抗高温 泡沫钻井液 泥浆体系 |
| 英文关键词: geothermal, geothermal well, high temperature resistance, foam drilling fluid, slurry system |
| 基金项目:中国石化集团科技攻关项目“地热井关键技术研究”资助（项目编号：JP13003） |
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| 中文摘要: |
| 高温地热钻井过程中，温度会对泡沫钻井液体系稳定性造成影响。针对高温地热井泡沫钻井液的技术要点，分别进行了发泡剂、稳泡剂、抗温土的优选，在此基础之上分别进行了泡沫钻井液的抗高温性能、抗污染能力进行了评价，实验结果表明：（1）优选出的发泡剂/聚合物/粘土体系在不同温度下进行测试，均具有良好的泡沫稳定性和发泡能力，说明初步形成的泡沫体系具有良好的抗230℃高温的能力。（2）模拟欠平衡钻进过程中地热水对泡沫钻井液体系的污染，该体系耐一价盐能达到20%，而且在加入5% CaCl2后析液半衰期仍在5min以上，最终形成一套抗高温能力可达230℃，具有较好悬浮携带能力的地热井抗高温环保钻井液体系。 |
| 英文摘要: |
| During high-temperature geothermal drilling, temperature can affect the stability of the foam drilling fluid system. Aiming at the technical points of foam drilling fluid for high-temperature geothermal wells, the foaming agent, foam stabilizer, and anti-temperature soil were optimized, respectively. On this basis, the performance of high temperature resistance and pollution resistance of the foam drilling fluid were evaluated by experiments. The results show that (1) the optimized foaming agent/polymer/clay system has good foam stability and foaming ability at different test temperatures, indicating that the initially formed foam system has good resistance to 230 ℃ high temperature capability. (2) In the process of simulating underbalanced drilling, geothermal water pollutes the foam drilling fluid system. The monovalent salt resistance of the system can reach 20%, and the half-life of the fluid after adding 5% CaCl2 remains more than 5min. Finally, a set of high temperature resistant environmentally friendly drilling fluid system for geothermal wells with high temperature resistance up to 230°C and good suspension carrying capacity was formed. |
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