注蒸汽热采稠油水平井砂埋机理及产能公式

Sand Plug Mechanism and Productivity Formula for Horizontal Well Development of Heavy Oil Reservoir by Steam Stimulation

在油田的生产中,出砂问题广泛存在且不可避免。对井底砂埋状况进行预测,是制定合理冲砂洗井措施,避免过于频繁作业或因作业措施不及时引起砂埋油层的重要手段。根据注蒸汽热采稠油水平井水平段砂埋的机理,分析了连续出砂的规律,提出了考虑砂埋因素的产能公式。通过实例验证了公式的合理性,为预判出砂井砂埋状况和及时冲砂提供了初步的理论依据。这将有助于延长注蒸汽热采稠油水平井轮次生产周期长度,提高产油量。

In the process of an oilfield production,sand production issue tends to extensive existence and be an inevitable.So it is important to predict the sand plug status of bottom hole,draw up rational sand washing measures,avoid sand plugging of oil layers due to too frequent operation and/or operation measures nor in time.Based on the horizontal interval sand plugging mechanism by horizontal well development of heavy oil reservoir with steam stimulation,this paper analyzed the regularity of continuous sand production,and proposed the productivity formula considering the sand plug factor.The case study indicates the rationality of the formula,which provides preliminary theoretical basis for prognosis of the sand plug situation in a sand producing well and implementing in-time sand washing.It is believed that this study will be helpful to prolong the production period length of each round of steam stimulation for heavy oil recovery by horizontal well process and increase the production of a heavy oil reservoir.