辽河油田是中国最大的稠油热采基地,稠油资源丰富,蒸汽吞吐是大部分稠油油藏的主要开发方式,但采收率仅为22%～25%。为有效提高辽河油田超稠油油藏采收率,针对油藏埋藏深、隔夹层发育和蒸汽吞吐后非均质性加剧等难题,开展蒸汽辅助重力泄油(SAGD)的室内物理模拟实验,进行油藏工程、钻采工艺、地面工艺等方面的系列攻关研究,先后经历了蒸汽辅助重力泄油先导试验、工业化一期工程和工业化扩大3个阶段。目前,辽河油田已有72个井组转为SAGD开发,2019年年产油达到105×104t/a,已连续3 a年产油超过100×104t/a。形成的地质、油藏、工艺配套的SAGD系列技术,可为同类油藏的开发提供借鉴。
Liaohe Oilfield is the largest thermal recovery base of heavy oil in China, which enjoys abundant heavy oil resources. Most of the heavy oil resources are productd by steam stimulation, with oil recovery factors of only 22%～25%. To improve the recovery factors of the superheavy oil reservoirs in Liaohe Oilfield, the laboratory physical simulation of steam assisted gravity drainage (SAGD) were carried out targeting the more deep buried depth of the reservoirs, interlayer developed reservoir, and increasing heterogeneity after steam stimulation. Meanwhile, a series of studies were conducted to tackle key issues inreservoir engineering, such as drilling and production technology and surface treatment technology. SAGD in Liaohe Oilfield experienced three stages,the pilot tests,the first phase of industrialized project and the enlargement of industrialization. And now there are 72 SAGD well groups and the annual oil production reached to 105×104t/a in 2019, exceeded 100×104t/a for three years. The SAGD technologies of reservoir geology, reservoir engineering and progress of surface technology were mature and complete, which provides references for the development of similar oil reservoirs.
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