均衡流量控水完井技术的控水效果评价方法

Evaluation Method of Water Control Effect of Conformance Flow Water Control Technology

刘成林 任杨 裴柏林 赵威

LIUChenglin RENYang PEIBailin ZHAOWei

中海石油(中国)有限公司深圳分公司, 广东 深圳 518052 安东柏林石油科技(北京)有限公司, 北京 昌平 102200

CNOOC China Limited, Shenzhen Branch, Shenzhen, Guangdong 518052, China Anton Bailin Petroleum Technology(Beijing) Co. Ltd., Changping, Beijing 102200, China

均衡流量控水完井技术在新投产水平井中的控水效果多采用“邻井”对比法进行对比评价，评价结果受干扰程度大。基于此类技术原理的控水效果评价方法，可对现有的评价方法进行补充。此类技术控水原理是通过控流装置和分段工具调节各生产段井壁处的回压，从而均衡产液剖面。短时间关井将使得井壁附近回压重新分配，在压力平衡的过程中出现高含水饱和度生产段的流体倒灌进入低含水饱和度生产段的现象。因此，此类技术的生效与倒灌现象的发生有一定的相关性。以应用此类技术的LFY13-2-A7井为例，关井前含水稳定在85.00%，再次开井出现含水率从90.81%逐渐降至85.69%后保持稳定且略有下降的“倒灌”现象。该现象与此类技术原理吻合，结合已有的“邻井”对比法结果，进一步证实该技术在LFY13-2-A7井中发挥了控水作用。

The evaluation of conformance flow water control technology in newly commissioned horizontal wells is usually verified by a single comparison with the offsets, but the comparison results could be greatly unreliable. Water control effect evaluation methods based on the principles of such technology can complement the existing evaluation methods. Conformance flow technology equalizes the output flow profile in each production section of horizontal well, making the axial pressure profile along the wellbore unbalanced. A short shut-in results in the redistribution of axial pressure in the wellbore, and in the process of pressure balance, the fluid in the production section with high water saturation flows out and backflows into the production section with low water saturation. Therefore, there is a correlation between the effectiveness of such techniques and the occurrence of backflow. For example, in Well LFY13-2-A7, where the conformance flow technology water control technology was applied, the water cut was stable at 85% before the well was shut in, and after the well was opened again, the water cut gradually decreased from 90.81% to 85.69% and then remained stable and slightly decreased. This phenomenon, together with referring to the data of the existing adjacent well comparison method, is fully consistent with the mechanism of the conformance flow water control technology, so it proves that this technology has played a role in water control in Well LFY13-2-A7.

10.11885/j.issn.1674-5086.2021.05.13.02