呼图壁储气库边底水水侵前缘动用及注采风险评价

doi:10.7657/XJPG20220110

摘要/Abstract

摘要：

具边底水储气库注采容易引起气水界面移动,水侵前缘运移及注采风险评估,对储气库水侵区库容的恢复和动用及注采井调峰能力的提升极其重要。以呼图壁储气库为例,评价了边底水储气库气水前缘恢复动用的可行性,利用示踪剂数值模拟技术确定注气前缘位置,通过多轮次注气驱替,提高储集层渗流能力。建立了影响注采井水侵的动、静态参数评价指标体系,并评价了呼图壁储气库30口投产注采井的见水风险等级。研究区高水侵风险井仅有3口,主要位于储气库的西部水侵区。制定了边底水储气库水侵预警机制,其要点在于生产过程中加大动态监测力度,及时跟踪中—高水侵风险井产水量、水气比、产水中Cl^-含量、井口压力等变化,调整优化注采速度及注采气量,从而控制气水前缘推进速度。

关键词: 呼图壁, 储气库, 边底水, 水侵, 注气前缘, 库容, 调峰能力, 风险评价, 预警机制

Abstract:

Injection and production of a UGS (underground gas storage) with edge and bottom water is likely forcing gas-water contact to move, so it is necessary to assess the migration of water invasion front and the injection-production risk since it is very important for recovering the storage capacity and improving the peak shaving ability of injection and production wells. Taking the Hutubi UGS as a case, we evaluated the feasibility of recovering the gas/water front of the UGS with edge and bottom water, simulated the position of gas front by tracer numerical simulation technology, and enhanced the flow capacity of the reservoir by multiple cycles of gas flooding. Then an indicator system evaluating dynamic and static parameters that affect the water invasion in injection and production wells was established, and the risks of water breakthrough were evaluated in 30 injection and production wells in Hutubi UGS. It is found that there are only 3 wells with high water invasion risk in the study area, which are located in the western water invasion area. Finally, an early water invasion warning mechanism was proposed. The mechanism aims to monitor the production performance, record real-time production parameters such as water production, water-gas ratio, Cl^- content in produced water and wellhead pressure of the wells with medium–high water invasion risks, and adjust and optimize the injection and production rates and gas volumes, and as a result, control the advancing speed of the gas/water front.

Key words: Hutubi, UGS, edge and bottom water, water invasion, gas injection front, storage capacity, peak shaving capacity, risk assessment, early warning mechanism

中图分类号:

TE332.3

廖伟, 刘国良, 李欣潞, 张赟新, 郑强, 陆叶. 呼图壁储气库边底水水侵前缘动用及注采风险评价[J]. 新疆石油地质, 2022, 43(1): 66-71.

LIAO Wei, LIU Guoliang, LI Xinlu, ZHANG Yunxin, ZHENG Qiang, LU Ye. Producing of Edge and Bottom Water Invasion Front and Risk Assessment on Injection and Production of Hutubi UGS[J]. Xinjiang Petroleum Geology, 2022, 43(1): 66-71.

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