海上油田“双高”阶段低效井综合治理研究

A Study on Comprehensive Treatment of Low Efficiency Wells in Offshore Oilfield with High Water Cut and High Recovery Stage

王欣然 王艳霞 王晓超 邓景夫 李红英

WANGXinran WANGYanxia WANGXiaochao DENGJingfu LIHongying

中海石油(中国)有限公司天津分公司, 天津 塘沽 300459 中海油能源发展股份有限公司工程技术分公司, 天津 塘沽 300452

CNOOC China Limited, Tianjin Branch, Tanggu, Tianjin 300459, Chinapar CNOOC EnerTech-Drilling & Production Company, Tanggu, Tianjin 300452, China

X油田是渤海典型的化学驱结束后续水驱油田，目前处于高含水及高采出程度的“双高”阶段，为解决开发生产过程中低产低效井逐渐增多且治理难度逐渐增加的问题，对油田储层沉积微相、地层物性参数、剩余油挖潜历程、开发方式转变、注采井网调整、增产措施影响等因素开展研究，分析低效井成因主要包括储层条件导致含水突升、井网不完善导致能量下降、过筛管压裂后采油井出砂等。针对不同成因低效井开展了分类治理研究，提出了区域流场调整、分层系开发、防砂筛管补贴等治理措施。2020-2021年矿场实践表明，对X油田12口低效井实施针对性的治理措施，单井平均高峰日增油达18 m$^3$，预测治理有效期内将累增油21×10$^4$ m$^3$，该油田的低效井治理技术使油藏生产能力得到有效释放，为同类海上油田低效井治理提供了参考和借鉴。

X Oilfield is a typical water flooding oilfield after chemical flooding in Bohai Sea, which had entered the high water cut and high recovery stage. In order to solve that gradually increasing low production and low efficiency wells and the treatment difficulty during the development and production process. By studying the factors such as sedimentary microfacies, formation physical property parameters, remaining oil tapping history, development mode change, injection-production well pattern adjustment, and stimulation measures, we conclude that the causes of low efficiency wells include abnormal water cut rise caused by reservoir conditions, energy reduction caused by imperfect well pattern, and sand production of production wells after screen fracturing. Classified treatment research has been carried out for low efficiency wells with different causes, and treatment measures such as regional flow field adjustment, layered system development, and subsidy for sand control screen have been put forward. The field practice from 2020 to 2021 shows that through the implementation of targeted treatment measures for 12 low efficiency wells in X Oilfield, the average peak daily oil increase of a single well reaches 18 m$^3$, and it is predicted that the cumulative oil increase will be achieved within the effective period of treatment by 21$\times$10$^4$ m$^3$, the low efficiency well treatment technology of the oilfield effectively releases the production capacity of the reservoir, which can provide reference for the low efficiency well treatment of similar offshore oilfields.

10.11885/j.issn.1674-5086.2022.06.23.02