含蜡量对凝析气藏地层流体相态特征影响研究  

Impact of Wax Content on Phase Behavior Characteristics of Formation Fluids in Condensate Gas Reservoirs

作　　者：陈东[1,2] 刘建仪 魏聪[1,2] 袁华[3] 任兴南 代力 CHEN Dong;LIU Jianyi;WEI Cong;YUAN Hua;REN Xingnan;DAI Li(PetroChina Tarim Oilfield Company,Korla,Xinjiang,841000,China;CNPC R&D Center for Ultra-Deep Complex Reservoir Exploration and Development,Korla,Xinjiang,841000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan,610500,China)

机构地区：[1]中国石油塔里木油田分公司,新疆库尔勒841000 [2]中国石油超深层复杂油气藏勘探开发技术研发中心,新疆库尔勒841000 [3]油气藏地质及开发工程国家重点实验室(西南石油大学),四川成都610500

出　　处：《石油钻探技术》2025年第1期108-114,共7页Petroleum Drilling Techniques

基　　金：中国石油天然气股份有限公司科学研究与技术开发项目“博孜-大北地区深层凝析气藏流体相态特征与采气工艺关键技术研究(编号:kt2020-21-01-01)”资助。

摘　　要：针对大北凝析气田多口井流体含蜡量差异大,含蜡量对凝析气藏地层流体相态特征影响认识不清的问题,建立了不同含蜡量凝析气藏地层流体样品的制作方法,复配了不同含蜡量的凝析气藏地层流体,开展了含蜡量对凝析气藏地层流体相态特征的影响试验。试验发现:随着含蜡量升高,闪蒸油与地层流体组分中重组分的含量增大,凝析油密度升高,闪蒸气组分变化较小;凝析气藏地层流体的露点压力随含蜡量升高而升高,含蜡量每升高1%,露点压力升高0.2642MPa;凝析气重质烃类组分反凝析作用与地层反凝析油的损失随含蜡量升高而增大,导致凝析气藏地层流体反凝析液饱和度升高,凝析油采出程度降低。研究结果可为高含蜡凝析气藏开发、结蜡预测模型完善以及清防蜡工艺技术优选提供指导。Fluid wax content of multiple wells in the Dabei condensate gas field has significant variation and the impact of different wax contents on the phase behavior characteristics of formation fluids in condensate gas reservoirs is not clear.To this end,we have established the method for preparing formation fluid samples of condensate gas reservoirs with varying wax contents,prepared formation fluids with different wax contents,and carried out the experiments to investigate the impact of different wax contents on the phase behavior characteristics of formation fluids in condensate gas reservoirs.The experimental results show that as the wax content increases,the content of heavy components in the flashed oil and formation fluid increases,leading to higher density of the condensate oil,while the component of flashed gas has relative minor changes.The dew point pressure of the formation fluids in condensate gas reservoirs increases with higher wax content,rising by 0.2642 MPa for every 1%increase in wax content.Additionally,as the wax content increases,retrograde condensation of heavy hydrocarbon components in condensate gas and the loss of retrograde condensate oil will increase,leading to higher retrograde condensed liquid saturation of formation fluids in condensate gas reservoirs and lower condensate oil recovery efficiency.These findings provide guidance for the development of condensate gas reservoirs with high wax content,the refinement of wax deposition prediction models,and the optimization of wax removal and prevention technology.

关 键 词：凝析气藏 含蜡量 地层流体 露点压力 相态特征 

分 类 号：TE372[石油与天然气工程—油气田开发工程]