复合堵漏技术在南堡油田NP1-P4C1井的应用

Key technology of compound circulation loss control and its application to NP1-P4C1 well in Nanpu Oilield

李良川 王在明 孙俊

LI Liangchuan WANG Zaiming SUN Jun

中国石油大学石油天然气工程学院，北京　102200 冀东油田公司钻采工艺研究院，河北唐山　063004 川庆钻探公司川东钻探公司，重庆　400021

针对南堡油田多次发生浅层渗透性滤失、裂缝性漏失和油层漏失等井漏情况，进行了复合堵漏技术研究。复合堵漏 浆配制时需要利用多种材料间的协同作用，特别是CMC 等材料的加入对堵漏有利；“平衡区域”形成是堵漏成功的关键，当堵 漏效果好时平衡区域向左移动，效果不好时则向右移动，甚至不能形成平衡区域，平衡区域的强度和渗透率对堵漏效果具有重 要作用；采用起钻静止堵漏时，静止时间不超过8 h ，因为在8 h 内堵漏材料通过滞留、膨胀，基本完成封堵屏障的建立；二次和 三次堵漏在水大量漏失后，堵漏能力会迅速提高，在现场进行堵漏作业时要有意识地使用多次堵漏方法；复合堵漏关键技术在NP1-P4C1 井的成功应用说明了复合堵漏适用于南堡油田井漏的预防和治理。

In view of the circulation loss occurred frequently in Nanpu Oilield in shallow permeability layer, fractured layer and reservoir, by researching in laboratory and practice in ield, the key technology of compound circulation loss control is summed up. The compatible effect of diversiied materials is needed for the preparation of compound plugging slurry, in particular the adding of CMC is favorable for circulation loss control. ‘Balance area” is critical to successful circulation loss control. It will move to the left if the effect of circulation loss control is good, otherwise it will turn left or no “balance area” will be formed at all. The intensity and permeability of the “balance area” is important to the effect of circulation loss control. Using static circulation loss control, the static time will take less than 8 hours, within which the sealed protective screen can be established based on the occlusion and swell of sealing materials. The circulation loss control capability will be improved remarkably after second and third circulation loss control, so the technology of multiple circulation control is proposed to be used in the ield. Successful application of the key technology of compound rculation loss control to NP1-P4C1 well indicate that the compound circulation loss control technology is it for the circulation loss prevention and treatment in the Nanpu Oilield.