| 摘要: |
| 针对泡沫钻井井壁失稳问题,优选了硅酸钾/聚乙烯醇作为抑制剂。通过泥页岩自吸、抑制膨润土造浆、滚动回收和硬度测试等实验,评价了其抑制性能。实验结果表明硅酸钾/聚乙烯醇具有良好的抑制特性。借助XRD分析,研究了硅酸钾/聚乙烯醇的强抑制作用机理。研究表明,硅酸钾/聚乙烯醇对泥页岩的强抑制性来源于硅酸钾与聚乙烯醇两者相协同作用的结果,其中封堵性与成膜性是其维持井壁稳定的主要因素。 |
| 关键词: 硅酸钾 聚乙烯醇 泡沫钻井 抑制性 |
| DOI：10.3969/j.issn.1007-3426.2013.05.014 |
| 分类号:TE254+.4 |
| 基金项目:中国石油天然气股份有限公司重大科技项目“非常规油气资源勘探开发技术研究”(2011A-4803) |
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| Properties research of potassium silicate/polyvinyl alcohol inhibitor |
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Zhang Yurui, Wan Liping, Ma Chentao, Shu Xiaobo, Li Gao, Zhu Li
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(State Key Laboratory of Oil and Gas Geology and Exploration, Southwest Petroleum University, Chengdu 610500, Sichuan, China)
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| Abstract: |
| Potassium silicate/polyvinyl alcohol inhibitor was selected to protect the borehole instability in foam drilling, and its inhibitive properties were evaluated by means of shale self-priming experiment, mud-making inhibition of bentonite, rolling recovery experiment and hardness test. The results indicate that potassium silicate/polyvinyl alcohol has a good inhibitive properties. Finally, the inhibition mechanism of the inhibitor was studied by XRD. The results showed that the strong inhibition of potassium silicate/polyvinyl alcohol to the shale is derived from the synergies of potassium silicate and polyvinyl alcohol, in which sealing property and film- forming ability are the major factors to maintain borehole stability. |
| Key words: potassium silicate polyvinyl alcohol foam drilling inhibitive property |
