复合防砂技术在稠油热采井的应用

八面河油田稠油Ⅱ类油藏粘度高,蒸汽吞吐开采属于主要开采方式之一。随着蒸汽吞吐规模以及轮次的增加,常规的防砂工艺难以确保热采井的正常生产,导致热采后出砂的根本原因:一是热采注汽加剧地层出砂,二是建立的挡砂屏障在多次蒸汽吞吐过程中遭到破坏。复合防砂技术通过在炮眼附近形成耐高温、高压的防砂屏障,同时井筒内采取机械防砂,确保了多轮热采后井筒及地层的防砂强度,降低了防砂屏障在注汽中遭受的破坏程度,达到一轮防砂,多轮次热采的目的。

Application of Composite Sand Control Technology in Heavy Oil Thermal Recovery

Steam huE and puff production is one of major production modes used in B type heavy oil reservoir with strong viscosity in Bamianhe Oilfield. However, it is difficult to ensure regular thermal recovery by means of normal sand prevention technology due to further steam huff and puff. Basic reasons leading to sand production after thermal recovery are as follows： 1） steam injection in the course of thermal recovery intensifies formation sand flow; 2） shield for warding off sand is damaged in the process of repeated huffs and puffs. Composite sand control technology has two functions： forming sand prevention shield resistant to high temperature and pressure near the shot hole and preventing sand flow mechanically in the borehole. This technology has helped to increase sand prevention capability of borehole and formation after multiple round of thermal recovery, to decrease damage scale sand prevention shield suffers from in the course of steam injection and to realize the goal of multi--round thermal recovery with only a round of sand prevention.