考虑液硫析出的超深酸性气藏数值模拟技术  

Numerical simulation for ultra-deep sour gas reservoirs with liquid sulfur condensate

作　　者：顾少华 石志良 史云清[1,2] 胡向阳[1,2] 岑芳[1,2] 

机构地区：[1]中国石化海相油气田开发重点实验室,北京100083 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《石油与天然气地质》2017年第6期1208-1216,共9页Oil & Gas Geology

基　　金：国家科技重大专项(2016ZX05017-005);中石化科技攻关项目(P15050)

摘　　要：超深酸性气藏开采时在储层中发生液硫析出现象,阻碍气体流动,降低气井产能。为研究液硫析出对气井生产的影响,建立考虑了液硫析出、气-液硫两相同流的酸性气藏数值模拟模型。基于上述模型开发了相应的数值模拟器,并将该模拟技术应用于四川盆地元坝长兴组气藏气井动态研究中。结果表明:液硫析出后在井壁附近聚集,并且自始至终仅局限于井筒附近。相较固硫析出而言,液硫析出对气井生产的影响较小,但仍能明显降低气井稳产期。在非均质地层中,析出的液硫主要聚集在储层物性较好的区域,如裂缝或溶孔等高渗区,造成气藏渗透性降低,气井产能下降。该模拟技术实现了对酸性气藏液硫析出的定量预测,为该类气藏的开发提供了可靠的决策依据。Liquid sulfur condensate phenomenon exists in ultra-deep sour gas reservoir,which affects the reservoir permeability and reduce the gas well productivity. A numerical simulation model proposed in this paper for sour gas reservoirs considers such a two phase flow with both liquid sulfur condensate and gas fluids. On basis of the model,a numerical simulator is developed and used in research of sour gas well production. The results shows liquid sulfur mainly gathers near wellbore,and never extend further during the entire production life. Compared with solid sulfur deposition,condensation of liquid sulfur has less effect on the gas well production. However,the peak production period of gas well reduces obviously. In heterogeneous formation,the liquid sulfur mainly gathers where better reservoir property is present. The liquid sulfur preferentially occupies high permeability zones such as fractures or vugs,which leads to reservoir permeability reduction and the well production decline. Based on this technology,the liquid sulfur condensate behavior in sour gas reservoir can be predicted quantitatively. Thus the technology can provide reliable results for decision-making.

关 键 词：数值模拟 液硫 速敏相渗 气井稳产 酸性气藏 长兴组 四川盆地 

分 类 号：TE348[石油与天然气工程—油气田开发工程]