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环空中两相流动空隙率变化特性研究

发表时间:2016-12-31  浏览量:1345  下载量:438
全部作者: 沈建文,王旭东
作者单位: 中石化西南工程有限公司钻井工程研究院
摘 要: 综合考虑气体溶解度、气体滑脱、油基钻井液体积系数,在多相流动模型的基础上,提出析剩气体模型,分析环空多相流动空隙率的变化规律,并采用显示差分法对模型求解。计算结果表明,在井底发生持续气侵过程中,考虑溶解度可产生环空0空隙率的现象,回压增大、气侵率减小及油基比减小均使环空0空隙率井段增加。碳酸气体侵入井底时,回压从0.1 MPa增至4.0 MPa,环空0空隙率井段从1 500 m增至2 700 m,与不考虑0空隙率比较,环空空隙率最大误差达21.22%;CO2气体侵入井底时,油基比从0.1增至5.0,环空0空隙率井段从1 450 m增至2 250 m,与不考虑0空隙率比较,环空空隙率最大误差达26.57%.
关 键 词: 石油、天然气能;溶解度;0空隙率;气液两相;钻井;环空
Title: Study on the characteristics of void fraction of two phase flow in annular
Author: SHEN Jianwen, WANG Xudong
Organization: Drilling Engineering Institute, Sinopec Southwest Petroleum Branch
Abstract: With consideration of the factors such as gas solubility, gas slippage, oil-based drilling fluid volume factor, on the basis of multiphase flow model, a residual gas model for gas-liquid is proposed, and the variation of void fraction for multiphase flow is analyzed along annular. The method of residual gas analysis is proposed to calculate the void fraction in annulus. The mode is solved by the explicit difference method. In the calculation example, when gas influx occurs in continuous in bottom hole, there is a 0 void fraction with considering the solubility. With the increasing of back pressure and the decreasing of gas influx rate and oil base ratio, the length of 0 void fraction increases in annulus. When carbonic gas influx occurs in bottom hole, the length of 0 void fraction in annulus increases from 1 500 m to 2 700 m with the back pressure increasing from 0.1 MPa to 4.0 MPa. The maximum void fraction error is 21.22%, in comparison with no consideration of 0 void ratio. When CO2 gas influx occurs in bottom hole, the length of 0 void fraction in annulus increases from 1 140 m to 2 250 m with the oil-base ratio increasing from 0.1 to 5.0. The maximum void fraction error is 26.57%, in comparison with no consideration of 0 void ratio.
Key words: oil, natural gas energy; solubility; 0 void fraction; gas-liquid two-phase; drilling; annulus
发表期数: 2016年12月第24期
引用格式: 沈建文,王旭东. 环空中两相流动空隙率变化特性研究[J]. 中国科技论文在线精品论文,2016,9(24):2544-2551.
 
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