Research on a New Methodology to Evaluate the Gas Migration in Cement Slurries
Annular gas flow after cementing has been a problem in the oil industry for many years. Research on the problem of annular gas flow is not new. A lot of corresponding slurries were developed, and most of them have been used successfully in some districts but not to the total alleviation of the problem. The main reason is the lack of a method to evaluate the gas migration of cement slurries when considering actual well parameters. In this paper, based on the art of the method to scale -down well parameters to laboratory for more realistic testing of cement recipes and by establishing the method of measuring cement slurries static gel strength to gain the development of the annular column hydrostatic pressure, a new method to evaluate the gas migration for cement slurries has been developed. This method depends on the decline of the upper annular column hydrostatic pressure and can be used to evaluate the ability of the cement slurry in controlling gas migration. Several cement slurries were investigated using this method. The laboratory tests were presented with good repeatability, and could be used to test the ability of cement slurries in controlling gas migration. In field applications, this method has been used in designing cement recipes when cementing gas wells in some areas of China. The ability of cement slurries in controlling gas migration has been tested. The field results were consistent with the laboratory tests, and demonstrated that the method could be used to guide cement slurries design effectively.
Zhu Haijin Qu Jiansheng Liu Aiping Zou Jianlong Xu Jiaxing
国际会议
2010 CNPC International Wellbore Technology Seminar(2010年CNPC井筒技术国际研讨会)
北京
英文
344-353
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）