测井技术2026，Vol.50Issue(2)：340-347,8.DOI:10.16489/j.issn.1004-1338.2026.02.014
氮气驱地面注入分气阀压力损失规律研究
Research on the Pressure Loss Law of Nitrogen Flooding Ground Injection Gas Distribution Valve
摘要
Abstract
In response to the development challenges of low-permeability oil reservoirs,such as poor water flooding effect,high injection pressure,and low recovery rate,nitrogen flooding as an efficient,low-cost,and environmentally friendly technology for enhancing recovery,has received extensive attention.However,in field applications,there are differences in permeability among different wells,and the independent regulation of single-well flow rate is the key to improving reservoir development efficiency.To achieve precise control of nitrogen flooding injection flow rate in low-permeability oil reservoirs under the condition of shared gas sources among multiple wells,and to solve the problems of unclear pressure loss laws of the valve and the reliance on experience for single-well flow rate regulation,this paper starts from the ground gas injection process,based on engineering thermodynamics theory and gas throttling equations,combined with the Van der Waals non-ideal gas state equation,calculates the physical parameters of high-pressure nitrogen,establishes a throttling calculation model for high-pressure nitrogen passing through the valve,the relationship between the throttling flow area of the valve,injection temperature,injection flow rate and pressure loss,and constructs a pressure loss chart of the valve.The numerical simulation results show that within the commonly used engineering conditions,the square root of the valve pressure loss is approximately linear with the injection flow rate,and the equivalent pressure loss method can be used to achieve quantitative allocation of injection for wells with different permeabilities.For the fluctuations of gas pressure and temperature in the pipeline during injection,a sensitivity analysis of valve pressure loss was conducted,and a sensitivity analysis chart is obtained.According to the chart,it can be known that the valve pressure loss fluctuates within 8%when the environmental temperature fluctuates;when the valve inlet gas source pressure fluctuates within±0.5 MPa,the pressure loss changes by approximately 3%.The sensitivity analysis conclusion of the valve indicates that within the common environmental temperature fluctuations and compressor pressure fluctuations,the pressure loss change amplitude is small,which shows that the valve parameters determined based on this model have good stability and reliability in the field and can meet the requirements of actual engineering operation.This research provides theoretical support and engineering reference for the process optimization and field operation of the high-pressure nitrogen flooding injection system,and is of great significance for improving the gas injection development efficiency of low-permeability oil reservoirs.关键词
氮气驱/注气工艺/分气阀/压力损失/节流模型/非理想气体/流量调控/绝热指数/敏感性分析Key words
nitrogen flooding/gas injection process/air distribution valve/pressure loss/throttling model/non-ideal gas/flow regulation/adiabatic index/sensitivity analysis分类
天文与地球科学引用本文复制引用
郁龙飞,刘兴斌,杨韵桐,刘肖健..氮气驱地面注入分气阀压力损失规律研究[J].测井技术,2026,50(2):340-347,8.基金项目
国家自然科学基金项目"网络模型的智能分层注水井压力脉冲数据传输方法"(52174021) （52174021）
