超稠油SAGD开发蒸汽腔形成及扩展规律研究

Study of steam chamber growth and expansion in SAGD for ultra heavy oil

SAGD蒸汽腔的形成及扩展与油藏压力、注入蒸汽干度密切相关,是超稠油油藏SAGD开发成功的关键。应用数值模拟技术及动态监测手段对直井与水平井组合SAGD蒸汽腔的形成及扩展规律进行研究,确定了蒸汽腔形成及扩展规律:蒸汽腔形成于注汽井点,初期腔体较小,横向扩展较快;连续注汽时,蒸汽腔纵向扩展速度逐渐加快并超过横向扩展速度,蒸汽腔下部横向扩展最慢。根据蒸汽腔的形成和扩展规律对蒸汽腔进行系统分析,确定了SAGD泄油通道的2种形式,为辽河油区SAGD试验过程中的动态调整提供了依据,同时也为辽河油区未来SAGD规模实施打下了坚实的理论基础。

The growth and expansion of SAGD steam chamber are closely related to reservoir pressure and steam quality,and are critical to successful SAGD in ultra heavy oil reservoir.This paper studies the growth and expansion of steam chamber with combination of vertical and horizontal wells using numerical simulation and dynamic monitoring.It is understood that steam chamber forms at steam injection well point,which is small in the beginning and rapidly expands laterally;when steam injection continues,vertical expansion of the chamber quickens and exceeds lateral expansion.Lateral expansion is especially slow in lower chamber.Steam chamber is systematically analyzed.It has been determined that there are 2 types of oil drainage paths.This study provides basis for dynamic modification and scale implementation of SAGD in Liaohe oil province.