渤海油田AY井组聚合物驱调整措施分析

Adjusting measures analysis of polymer flooding for AY well pattern of Bohai Oilfield

詹盛云 陈鹏 王锦林 王宏申

Zhan Shengyun Chen Peng Wang Jinlin Wang Hongshen

中海石油研究总院, 北京 100027

CNOOC Research Institute, Beijing 100027

渤海油田于2005年11月开始实施AY井组聚合物驱油试验。实施聚驱时,该井组的综合含水率已上升至57.9%,聚驱后含水上升速度得到有效控制,效果明显。但是,注聚实施过程中遇到了一些问题:外围注水井B-14、A-12和A-13因提高注入量,导致注入水向A-1、A-4、A-2井突进,使这些井含水率上升了10.0%~22.2%;周围注聚井A-7、A-6等井的聚合物沿高渗透层向中心井AY突进,导致中心井含水率上升了32%,聚合物产出浓度上升了150 mg/L左右。通过措施调整,如外围注水井B-14、A-12和A-13转注聚、中心区块聚合物注入浓度由1750 mg/L提高到2500mg/L等,使得一些前期受外围注水井影响的井的含水率下降了8%左右,而且使中心井的含水率下降16%左右,聚合物产出浓度下降了100 mg/L左右。这些措施有效抑制了外围注水井突进及中心井聚驱突进,保障了聚驱开发的效果。

The polymer technology pilot test for AY well pattern was initialed in November, 2005 in Bohai oilfield. The water cut of well pattern rose to 57.9% before polymer flooding. The increase of water cut was effectively controlled after polymer flooding trial. However, it encountered with some problems in the process of polymer injection, such as water cut of well A-1, A-4, A-2 increased by 10.0%~22.2% because water injection rate of external injection well B-14, A-12 and A-13 was enhanced which led water breaking through into well A-1, A-4, A-2. On the other hand, polymer from circumjacent well A-7, A-6 and other wells broke through to well AY. Water cut of well AY increased by 32% and polymer concentration increased by 150 mg/L. Measures such as transferring external water injection wells such as B-14, A-12 and A-13 to polymer injection wells and enhancing polymer concentration of central block from 1 750 mg/L to 2 500 mg/L were taken to decrease water cut of wells influenced by external water injection wells by 8%. On the other hand, water cut of the center well drop down by about 16% and output polymer concentration decreased by about 100 mg/L. Those measures effectively inhibited water breaking through and ensured good impact of polymer flooding development.

https://doi.org/10.3969/j.issn.1008-2336.2010.03.056