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Analysis of the Weight Loss of High Temperature Cement Slurry 被引量:1
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作者 Kunhong Lv Zhiqiang Huang +1 位作者 Xingjie Ling Xueqin Xia 《Fluid Dynamics & Materials Processing》 EI 2022年第5期1307-1318,共12页
The weight loss of cement slurry is the main cause of early annular air channeling and accurate experimental evaluation of the law of loss change is the key to achieve compression stability and prevent this undesired ... The weight loss of cement slurry is the main cause of early annular air channeling and accurate experimental evaluation of the law of loss change is the key to achieve compression stability and prevent this undesired phenomenon.Typically,tests on the pressure loss of cement slurry are carried out for temperature smaller than 120°C,and this condition cannot simulate effectively the situation occurring in high temperature wells.For this reason,in this study a series of experimental tests have been conducted considering a larger range of temperatures,different retarders and fluid loss additives.The results show that with an increase in the temperature,the weight loss curve of cement slurry changes from a“two-stage”to a“three-stage”behavior,and the risk of channeling increases accordingly.On increasing the amount of retarder and fluid loss additive,the transition time of cement slurry displays a non-monotonic behavior(it decreases first and then increases).It is found that the optimized retarder and fluid loss additive dosage are 0.2%and 2.5%,respectively. 展开更多
关键词 CEMENTING weight loss test weight loss law cement slurry EVALUATION anti-gas channeling
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Comprehensive Study on the Estimation of the Variance Components of Traverse Nets
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作者 WANG Zhongfeng 《Geo-Spatial Information Science》 2003年第1期43-48,共6页
This paper advances a new simplified formula for estimating variance components ,sums up the basic law to calculate the weights of observed values and a circulation method using the increaments of weights when estimat... This paper advances a new simplified formula for estimating variance components ,sums up the basic law to calculate the weights of observed values and a circulation method using the increaments of weights when estimating the variance components of traverse nets,advances the charicteristic roots method to estimate the variance components of traveres nets and presents a practical method to make two real and symmetric matrices two diagonal ones. 展开更多
关键词 traverse nets variance component redundant observation component law to calculate weights characteristic roots method
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