致密富水凝析气藏压裂水平井产能特征数值模拟  

Numerical simulation of productivity characteristics of fractured horizontal wells in tight water-rich condensate gas reservoirs

作　　者：马斌 张明 闫兵帮 石羽亮 方志刚 李东东 刘治彬 刘建仪[3] MA Bin;ZHANG Ming;YAN Bingbang;SHI Yuliang;FANG Zhigang;LI Dongdong;LIU Zhibin;LIU Jianyi(Research Institute of Oil Production Technology,Tuha Oilfield Branch,PetroChina,Hami 839000;No.2 Gas Production Plant,Changqing Oilfield Branch,PetroChina,Yulin 719000;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中国石油吐哈油田分公司采油工艺研究院,新疆哈密839000 [2]中国石油长庆油田分公司第二采气厂,陕西榆林719000 [3]西南石油大学油气藏地质及开发工程全国重点实验室,四川成都610500

出　　处：《断块油气田》2024年第5期885-892,共8页Fault-Block Oil & Gas Field

基　　金：国家自然科学基金项目“垂直疏水性圆管湍流场中多液滴形成机制及其携带模型研究”(51974263)。

摘　　要：吐哈气田吉7区块为深层致密砂岩富水凝析气藏,具有孔渗极低、孔隙含水饱和度高、流体凝析油含量高等特征。文中考虑了储层改造区内压裂诱导裂缝与天然裂缝分布特征及其强应力敏感性,建立了区块典型气井双孔双渗多段压裂水平井组分流体数值模拟模型,实现了早期压后返排生产阶段历史拟合与产能预测。模拟分析表明:气井生产早期,超压返排阶段油气产量高,以改造区裂缝供给为主,由于裂缝强应力敏感性,裂缝压力快速下降使渗透率降低,油气产能快速下降;随着生产进行,改造区内的基质逐渐向裂缝窜流供液,气井产能趋于稳定,但改造区外基质内油气由于渗透率低难以被有效采出;凝析气藏在开发短时间内即有凝析油析出,但主要析出在储层改造区内的裂缝中,对渗流造成的反凝析伤害较低;富水凝析气藏可流动水的弹性膨胀能部分转换为了油气产量,相同地层压力下,油气衰竭采出程度比束缚水气藏高,但油气流动更加困难,不利于凝析气藏开发。研究成果与认识对类似致密富水凝析气藏的开发具有重要的指导意义。JI7 block of Tuha gas field is a deep tight sandstone water-rich condensate gas reservoir characterized by extremely low porosity and permeability,high pore water saturation,and high condensate oil content in fluid.In this paper,the distribution characteristics and strong stress sensitivity of fracturing-induced fractures and natural fractures in the reservoir stimulation area were considered,and a numerical simulation model for component fluid of dual porosity and dual permeability multi-stage fracturing horizontal wells was established,achieving historical fitting and productivity prediction of the flow back production stage after early-stage fracturing.Simulation analysis shows that in the early stage of gas well production,oil and gas production is high during the overpressure flow back stage,mainly supplied by fractures of the stimulation area.Due to the strong stress sensitivity of fractures,the rapid decrease in fracture pressure leads to a decrease in permeability and a rapid decrease in oil and gas production capacity.As production progresses,the matrix within the stimulation area gradually flows towards the fracture channeling for fluid supply,and the production capacity of the gas well tends to stabilize.However,the oil and gas in the matrix outside the stimulation area are difficult to be effectively recovered due to low permeability.After a short period of development,there are condensate oil precipitating in the formation of condensate gas reservoir,but the precipitation mainly occurs in fractures of the stimulation area,and the retrograde condensation damage caused to seepage is relatively low.Water-rich condensate gas reservoirs convert part of the elastic expansion energy of flowing water into oil and gas production.Under the same formation pressure,the degree of oil and gas depletion recovery of water-rich condensate gas reservoirs is higher than that of bound water gas reservoirs,but the flow of oil and gas is more difficult,which is not conducive to the development of condensate gas reservoirs

关 键 词：致密气藏 富水气藏 数值模拟 压裂水平井 

分 类 号：TE331[石油与天然气工程—油气田开发工程]