摘要
针对双水平井SAGD开发中后期普遍存在的地层能量不足,泄油能力、油汽比低和热损失严重等问题,提出多介质强化提高开发效果技术,采用室内实验和数值模拟相结合方法,揭示关键机理并对主要注入参数进行优化。结果表明,SAGD开发中后期注入多介质后,具有双重降黏、改善汽腔发育形态、提高重力泄油能力、减少热损失和节约蒸汽等作用。溶剂在汽腔扩展至油藏顶部时注入更易发挥其溶解降黏作用,汽腔横向扩展结束时停注溶剂可提高其回收率;非凝析气甲烷的注入时机、注入方式和注入量对油汽比有重要影响。与纯蒸汽SAGD相比,多介质强化SAGD日均产油量提高3.9 t/d,油汽比提高0.093,日注汽量下降6.7 t/d,实施3个月投入产出比达1∶4。
In view of the common problems in the middle and later stages of steam-assisted gravity drainage(SAGD)development with dual-horizontal wells,such as insufficient formation energy,low oil discharge capacity and oil-steam ratio,and serious heat loss,the technology of multi-media enhancement to improve development effects was put forward.The key mechanism was revealed,and the main injection parameters were optimized by combining laboratory experiments and numerical simulation.The results show that the injection of multi-media can reduce the viscosity,improve the shapes of steam chambers,increase the gravity oil discharge capacity,alleviate the heat loss,and save the steam in the middle and later stages of SAGD development.The solvents are easier to dissolve and reduce viscosity when the steam chambers extend to the tops of the reservoirs,and stopping the injection of solvents can improve the recovery rates when the steam chambers stop the lateral expansion;injection timings,methods,and amounts of non-condensate methane have a significant influence on the final oil-steam ratio.Compared with that of pure SAGD,the average daily oil production of SAGD enhanced by multiple media increases by 3.9 t/d.The oil-steam ratio increases by 0.093,and the daily steam injection decreases by 6.7 t/d.The technology has been implemented for three months,and the input-output ratio is 1∶4.
作者
杨浩哲
杨果
周晓义
马小梅
陈超
刘婷婷
李辉
杨凤芝
YANG Haozhe;YANG Guo;ZHOU Xiaoyi;MA Xiaomei;CHEN Chao;LIU Tingting;LI Hui;YANG Fengzhi(Fengcheng Oilfield Operating Area of PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang,834000,China;FOR-ENERGY Petroleum Technology Co.,Ltd.,Beijing City,100083,China)
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2023年第4期123-129,共7页
Petroleum Geology and Recovery Efficiency
基金
中国石油科技攻关项目“改善浅层超稠油SAGD开发效果技术示范工程”(2016ZX05055-002)。
关键词
SAGD
超稠油
多介质
SAGP
数值模拟
SAGD
super heavy oil
multi-media assisted
SAGP
numerical simulation
