石油钻采工艺2023，Vol.45Issue(4)：485-492,8.DOI:10.13639/j.odpt.202211032
超高压产水气井可视化井下节流模拟实验及嘴流模型评价
Visual downhole throttling simulation experiment and nozzle flow model evaluation for water-producing gas wells with ultrahigh pressure
摘要
Abstract
Downhole throttling can effectively prevent hydrate generation at wellhead,simplify surface processes and reduce costs.However,when this technology is applied in water-producing gas wells with ultrahigh pressure,the mutual influence between gas-liquid two-phase flow and nozzle flow may lead to significant discrepancies between the daily gas production and the designed values for some wells.Accurately predicting the flow rate and pressure drop of gas and liquid through downhole throttler is crucial to process design.To address this issue,one study was conducted based on a constructed visualization experimental apparatus to perform downhole throttling simulation experiments.The dynamics of gas-liquid two-phase nozzle flow under different flow patterns was analyzed.Data were divided based on the upstream flow pattern before the throttler,and the performance of four commonly used engineering nozzle flow models under different flow patterns was evaluated.The research results show that among the mathematical models used to predict mass and flow rate for slug flow,turbulent flow and annular flow,it is recommended to apply Ashford model(with correlation coefficient R2 is 0.92),Sachdeva model(with correlation coefficient R2 is 0.80),and Al-Safran model(with correlation coefficient R2 is 0.96),respectively.To verify the accuracy of the model evaluation results.Well Shuangtan 8 was selected for field application.The depth of the downhole throttler was determined to be 3 000 meters,the flow pattern was judged to be turbulent flow,and the calculated nozzle diameter was 5.3 mm according to the selected Sachdeva model.The evaluation results of the model can provide theoretical basis and guidance for the design of downhole throttling technology in water producing gas wells,and have certain promotion value.关键词
产水气井/超高压/井下节流/可视化实验/流型/两相嘴流模型Key words
water-producing gas wells/ultrahigh pressure/downhole throttling/visual experiment/flow pattern/two-phase nozzle flow model分类
能源科技引用本文复制引用
马辉运,董宗豪,周玮,魏林胜,谭昊,王威林..超高压产水气井可视化井下节流模拟实验及嘴流模型评价[J].石油钻采工艺,2023,45(4):485-492,8.基金项目
中国石油西南油气田分公司川西专项合作项目"川西超深井排水采气技术攻关与试验"(编号:JS2022-07). （编号:JS2022-07）
