The invention relates to a method for gas assisted SAGD recovery of super heavy oil reservoir, selected for 530m, the residual oil saturation is more than 0.50, the thickness of the oil > 10.0m > 250md, horizontal permeability, vertical and horizontal permeability ratio > 0.1, > 0.20 reservoir porosity, permeability, continuous distribution of mud shale reservoir does not exist in the reservoir; drilling horizontal well in handling straight wells, well spacing in 35 meters or drilling of horizontal wells in the reservoir bottom, the vertical distance of 6 meters; 3 cycle throughput, the formation of thermal communication between wells, wells with continuous steam injection, 3 years of production of horizontal wells, with straight nitrogen and steam injection wells, underground volume ratio as of 0.5, the total amount of nitrogen injection reached 0.10PV after the stop, continue to steam injection, steam injection rate is 1.4m = 3 / d.ha .m, the bottom steam dryness is 70%, the injection production ratio is kept at 1.2, and the recovery degree is increased by 6 to 9%, and the ratio of oil to steam is increased from 0.02 to 0.05.
【技术实现步骤摘要】
【技术保护点】
一种气体辅助ＳＡＧＤ开采超稠油的方法，其特征在于： １）根据油田地质特征与开发现状，进行粗筛选油藏满足以下条件：油层较浅为５３０ｍ，剩余油饱和度＞０．５０，油层厚度＞１０．０ｍ，水平渗透率＞２５０ｍｄ，垂直与水平渗透率比值＞０．１，油 层孔隙度＞０．２０，油层中不存在连续分布的不渗透泥、页岩夹层； ２）在已有蒸汽吞吐直井间新钻水平井作为生产井，注采井井间平面距离为３０～５０ｍ；或在靠近油层底部钻一对水平井，注采井垂向距离４～６ｍ； ３）新钻水平井吞吐３周期，井 间形成热连通后，首先采用注汽直井连续注纯蒸汽，水平井连续生产的方式３年后，转换为注汽直井连续注氮气和蒸汽的方式。注入过程中，氮气与蒸汽冷水当量的地下体积比为０．５，氮气的总注入量达到０．１０ＰＶ后停住，但继续注蒸汽，直到生产结束，单井组注汽速度为１．４ｍ↑［３］／ｄ．ｈａ．ｍ，井底蒸汽干度为７０％，采注比保持在１．２。
【技术特征摘要】
【专利技术属性】
技术研发人员：刘尚奇，高永荣，郭二鹏，
申请(专利权)人：中国石油天然气股份有限公司，
类型：发明
国别省市：11[中国|北京]
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