丰深1凝析气藏相态特征研究  

EXPERIMENTAL STUDY ON PHASE BEHAVIOR OF GAS CONDENSATE RESERVOIR OF FENGSHEN WELL-1

作　　者：周伦先[1] 褚小兵[2] 

机构地区：[1]胜利油田分公司地质科学研究院,山东东营257015 [2]胜利油田分公司科技处,山东东营257000

出　　处：《西南石油大学学报（自然科学版）》2008年第3期81-84,共4页Journal of Southwest Petroleum University(Science & Technology Edition)

摘　　要：丰深1凝析气藏是济阳拗陷古近系深层凝析气藏的首次发现。通过对地层流体组成分析、恒质膨胀和定容衰竭实验,及井下温度、压力连续测量,对丰深1凝析气藏相态特征进行了深入研究。结果表明,丰深1凝析气藏为高温、高压不饱和凝析气藏,无油环;地层流体中间烃、重烃含量高,凝析油含量为606g/m3,属高含凝析油的凝析气;该凝析气藏地露压差6.70MPa,衰竭式开采地层压力下降快,6mm气嘴生产时,生产初期近井地层压力就降到露点压力以下,出现反凝析现象,反凝析损失严重,重质组分采收率低,油气两相流动造成渗流阻力增加,使单井产能下降。相态研究为丰深1含油气砂砾岩体储量评估和开发方案编制提供了依据,对济阳拗陷同类型油气藏勘探开发具有指导意义。Fengshen well-1 gas condensate reservoir is the first discovery of Paleogene deep gas condensate reservoir in Jiyang Depression.The authors of this paper study in detail on the phase behavior of gas condensate reservoir of Fengshen well-1 based on the analysis of formation fluid composition,experiment of constant composition expansion and constant volume depletion,along with continuous measurement of downhole temperature and pressure.The results suggest that the reservoir of Fengshen well-1 belongs to unsaturated gas condensate one with high temperature and high pressure,but without oil ring.The content of intermediate and heavy hydrocarbon composition is high.The content of oil is 606 g/cm3,which shows that the gas condensate reservoir is rich of condensate oil.The difference between formation pressure and dew point pressure is 6.70 MPa,and with natural depletion drive,the formation pressure drops sharply.When producing with 6 mm flow nipple,formation pressure near well bore decreases below dew point pressure in the early production period,the retrograde condensate phenomenon occurs.Due to the serious loss of retrograde condensation,low recovery of heavy hydrocarbon component and the increase of filtrational resistance caused by oil/gas two-phase flow,the production of individual well decreases.Study on the phase behavior provides the basis for reserve evaluation of hydrocarbon-bearing glutenite and profiling of development program,and can guide significantly the exploration and development of the same types of reservoirs in Jiyang Depression.

关 键 词：凝析气藏 流体相态 恒质膨胀 定容衰竭 济阳拗陷 

分 类 号：TE372[石油与天然气工程—油气田开发工程]