石油钻采工艺2017，Vol.39Issue(2)：163-168,6.DOI:10.13639/j.odpt.2017.02.007
超临界水射流焦汤系数计算与节流过程降温效果分析
The calculation of Joule Thomson coefficient of supercritical water jet flow and the analysis on cooling effect in the process of throttling
摘要
Abstract
It is a process of throttling flow when high-temperature fluid flows through nozzles. It can change the internal tempera-ture of fluid, and consequently impact the impact force and thermal cracking effect of high-temperature jet flow. In this paper, the for-mula for calculating Joule Thomson coefficient during the running of jet flow through the nozzle was deduced by applying the definition formulas of physical property equation and Joule Thomson coefficient of supercritical water. Then, a program was prepared for iterationcalculation to figure out the distribution characteristics and change laws of Joule Thomson coefficient for different parameters. Finally, Joule Thomson coefficient calculation formula was adopted to calculate the change laws of temperature drop corresponding to different parameters in the process of nozzle throttling. It is indicated that Joule Thomson coefficient is positive under the condition of 25 to 65 MPa and 650 to 1000 K. As the temperature inside the reaction chamber increases, Joule Thomson coefficient increases first and then decreases. And its maximum value is 4.92 in the conditions described in this paper. As the pressure inside the reaction chamber increases, Joule Thomson coefficient decreases and reaches the minimum 0.22, under the condition of 65 MPa and 650 K. Maximum Joule Thom-son effect occurs at superheated steam zones, and deviates from the boundary line with the increasing of temperature. Temperature and pressure drops shall not be neglected during the jetting of jet flow. And its maximum could reach 73.5 K in the conditions described in this paper. Therefore, it is necessary to set rationally the temperature and pressure inside the reaction chamber so as to decrease the temperature loss of high-temperature jet flow when it runs through the nozzle.关键词
超临界水射流/节流过程/焦耳汤姆逊系数/温度降Key words
supercritical water jet/throttling process/Joule Thomson coefficient/temperature drop分类
能源科技引用本文复制引用
胡晓东,宋先知,李根生,沈忠厚,彭炽,朱斌..超临界水射流焦汤系数计算与节流过程降温效果分析[J].石油钻采工艺,2017,39(2):163-168,6.基金项目
国家自然科学基金项目"深层高温高压油气井安全高效钻完井基础研究"(编号:U1562212) （编号:U1562212）
"高温射流冲击-热裂解耦合破岩机理与实验研究"(编号:51504272) （编号:51504272）
中国石油科技创新基金研究项目"热力射流冲击-裂解耦合破岩机理研究"(编号:2015D-5006-0308). （编号:2015D-5006-0308）
