辽河油田开发中后期,地层亏空严重,油层出砂加剧,常规的冲砂工艺或利用暂堵剂冲砂均无法建立有效的循环,影响油井的正常生产。低压漏失井自吸式连续冲砂工艺是解决该问题的有效技术之一,但在实际使用过程中,存在工序繁琐、冲砂液漏失量大、砂堵等问题。为此,研制了双级整体管柱和强制循环阀等配套工具,改进和完善了低压漏失井自吸式连续冲砂技术。该技术已经应用300井次,恢复油井产能达5 000 t,应用效果良好。该技术可为由于地层亏空出现出砂现象的油井复产提供技术支持。
In the middle and late stages of oilfield development, due to the severe formation deficit and the intensified sand production in the oil layer, an effective circulation was not be established through the conventional sand flushing process or the use of temporary plugging agent for sand flushing, thus affecting the normal production of oil wells. The self-priming continuous sand flushing process for low pressure absorption wells is one of the effective technologies to solve this problem, but in actual use, there are problems such as cumbersome procedures, large loss of sand flushing fluid, and sand plugging. To this end, supporting tools such as two-stage integral pipe string and forced circulation valve have been developed, thereby improving and perfecting the self-priming continuous sand flushing technology for low pressure absorption wells. This technology has been applied for 300 well times, restoring oil well productivity up to 5000t, with good application results. This technology can provide technical support for the resumption of production of oil wells with sand production due to formation deficit.
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