液面恢复测压综合密度ρ处理新模型  

The new model for calculating comprehensive density ρof liquid level recovery pressure

作　　者：刘涛 葛政廷 张龙 刘玉栋 同鑫 肖飞 LIU Tao;GE Zhengting;ZHANG Long;LIU Yudong;TONG Xin;XIAO Fei(Oil Production Plant 6 of PetroChina Changqing Oilfield Company,Yulin Shaanxi 719000,China)

机构地区：[1]中国石油长庆油田分公司第六采油厂,陕西榆林719000

出　　处：《石油化工应用》2020年第3期66-71,共6页Petrochemical Industry Application

摘　　要：合理的压力监测系统是进行油田动态监测、分析和制定科学开发调整方案的基础。目前现场应用较多的液面恢复测压方法存在综合密度ρ处理精度低、计算过程忽略原油脱气的影响,导致计算结果不能准确反映地层真实的压力状况。根据液面恢复测压原理及油井开发过程井筒相态变化特征,建立了考虑井筒脱气的综合密度ρ处理新模型,对比分析了含水率、脱气量以及关井时间之间的变化对地层压力产生的影响,并对地层压力计算步骤进行了讨论,认识到当脱气量和含水率达到一定程度时,必须考虑原油脱气对地层压力计算结果产生的影响。最后利用综合密度ρ处理新模型对油田现场的实测井进行应用计算,得到较为可靠的地层压力结果。新模型求解过程简单、实用,具有较好的应用推广价值,这无疑对油田压力系统监测及合理高效开发具有重要的指导意义。Reasonable pressure monitoring system is the basis of dynamic monitoring and analysis and making scientific development plan of oilfield. The present applied liquid level recovery pressure method is low calculating accuracy and this method overlook the impact of crude oil degassing. Leads to the calculation results can not accurately reflect the actual stress condition of the formation. According to the principle of liquid level recovery pressure and the characteristics of wellbore phase behavior change, the new model of comprehensive density ρ that considering the effect of wellbore degassing was established. Contrasted and analyzed of the impact between moisture content, mass of degassing and shut-in time to the formation pressure, and then discussed the calculation steps of the formation pressure. Realized the calculation results of formation pressure must be considered the degassing of crude oil when mass of degassing and moisture content achieve a certain level. Finally a demon-stration for calculation of the test wells in oilfield is given by using the new model of comprehensive density ρ and gets the more reliable results of formation pressure. The new model solving process is simple, practical, and it has valuable to apply and spread, undoubtedly,this new model has guiding significance in the practice to monitoring of oil pressure system and rational development.

关 键 词：液面恢复测压 综合密度ρ 原油脱气 地层压力 

分 类 号：TE271[石油与天然气工程—油气井工程]