石油钻采工艺2025，Vol.47Issue(2)：168-178,11.DOI:10.13639/j.odpt.202503016
高温高压气井酸性气体溢流运移规律
Research on the migration law of acid gas overflow in high temperature and high pressure gas wells
摘要
Abstract
Most of the ultra deep gas wells in China are high temperature,high pressure and high sulfur.The problems such as unclear blowout mechanism of acid gas wells and difficult wellbore pressure inversion lead to great challenges in well control.In order to reveal the causes of acid gas well blowout and clarify the influence of different acid gas content on annulus fluid flow,this paper considers the influence of solubility and phase state change on the physical properties of acid gas,uses the method of quasi critical parameters instead of critical parameters to analyze the variation laws of gas density and solubility along well depth,and establishes an acid gas annulus flow model with dissolution phase change effect.Four point difference was used to construct a grid solution model to explore the flow characteristics of annular gas after overflow,and the distribution laws of physical properties of acid gas,wellbore pressure,temperature and other parameters with well depth were discussed.The results show that the physical properties of acid gas change significantly with well depth:the more acid gas in the wellbore,the smaller the deviation factor,the greater the density and viscosity,and the parameter changes near the pseudo critical point are more than 40%;Compared with pure methane,the volume expansion of mixed fluid containing acid gas near the wellhead exceeds 20%,and the flow rate increases by more than 10%,resulting in increased well control risk.The study clarified the migration law of acid gas overflow in high temperature and high pressure gas wells,which has guiding significance for optimizing well control design,improving well control emergency plan,and formulating well killing measures.关键词
勘探开发/能源安全/工程技术/钻井/安全/深层/油气资源Key words
exploration and development/energy security/engineering technology/drilling/safety/deep layer/oil and gas resources分类
石油、天然气工程引用本文复制引用
郭海清,魏军会,王鹏程,张绪亮,秦浩,汤明..高温高压气井酸性气体溢流运移规律[J].石油钻采工艺,2025,47(2):168-178,11.基金项目
国家自然科学基金"深层页岩气水平井钻井井筒温度场调控研究"(编号:52374012) （编号:52374012）
国家自然科学基金青年科学基金"基于水化进程的泥岩地层井壁坍塌机理研究"(编号:51904260). （编号:51904260）
