基于土壤学的胶凝态水泥浆孔隙度测试方法

Method for testing porosity of gelled cement slurry based on soil science

李早元 李进 刘健 董广超 张凯 郭小阳

LI Zaoyuan LI Jin LIU Jian DONG Guangchao ZHANG Kai GUO Xiaoyang

西南石油大学油气藏地质及开发工程国家重点实验室，四川成都　610500 中海石油中国有限公司天津分公司渤海石油研究院，天津　300452

State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China Bohai Oil Research Institute, Tianjin Branch of CNOOC, Tianjin 300452, China

胶凝态水泥浆孔隙度是水泥浆凝结过程中评价胶凝态性能的重要参数之一。通过定性分析、实验验证的方法，对胶凝态水泥浆和土壤进行了宏观及微观等对比分析，两者具有相类似的“骨架- 孔隙结构”，均表现出一定的孔隙性和渗透性。因此，引入土壤学中土壤孔隙度测试方法，同时结合胶凝态水泥浆的水化特性，将土壤孔隙度测试原理中烘干方式改进为液氮冷冻干燥、真空负压干燥或用无水乙醇浸泡终止水化后再升温干燥等可抑制水化反应的烘干方式。应用该方法对特定水化时间下的浆体开展了孔隙度探索实验，为检测水泥浆体的孔隙度提供了可借鉴的方法。

The porosity of gelled cement slurry is one of the important parameters in evaluating the gelling performance in the process of cement slurry gelling. This article compared and analyzed the gelled cement slurry and soil in macro and micro scales by means of qualitative analysis and experimental demonstration, and the result shows that these two have similar ‘framework-pore structure’, both showing certain porosity and permeability. Therefore, by introducing the method of soil porosity testing in soil science, and combining the hydration properties of gelled cement slurry, the drying method in the soil porosity test principle is changed to freeze drying by liquid nitrogen, vacuum negative pressure drying or heated and dried after hydration is terminated by soaking in absolute ethyl alcohol which can inhibit hydration. And research was conducted on the porosity of slurry at specific hydration time, which provides reference for detection of porosity of cement slurry.

10.13639/j.odpt.2015.03.011