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[1]周照恒,李玉星,林敏,等.盐穴储气库注采气井脖颈收缩原因及预防治理措施[J].油气储运,2024,43(11):1-10.
　ZHOU Zhaoheng,LI Yuxing,LIN Min,et al.Causes of neck contraction of gas injection-production well in salt cavern gas storage and its prevention and remedial measures[J].Oil & Gas Storage and Transportation,2024,43(11):1-10.

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盐穴储气库注采气井脖颈收缩原因及预防治理措施

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年11期页码: 1-10 栏目: 出版日期: 2024-11-25

Title:: Causes of neck contraction of gas injection-production well in salt cavern gas storage and its prevention and remedial measures

作者:: 周照恒; 李玉星; 林敏; 郭宏帅; 王建夫

Author(s):: ZHOU Zhaoheng; LI Yuxing; LIN Min; GUO Hongshuai; WANG Jianfu

关键词:: 盐穴储气库; 注采气井; 脖颈收缩; 蠕变; 盐结晶

Keywords:: salt cavern gas storage; injection-production gas wells; neck contraction; creep; salt crystallization

分类号:: TE822

文献标志码:: A

摘要:: 【目的】2019年相关人员在金坛盐穴储气库进行带压测腔施工过程中发现有2个注采气井的脖颈收缩严重，与2013年的检测结果相比，体积收缩率分别达66%与72%，为避免脖颈继续收缩所导致的脖颈段通道堵塞，保障注采气的安全稳定运行，需开展腔体的脖颈收缩原因研究，有针对性的提出预防及治理措施。【方法】参考金坛盐穴储气库中2个腔体的生产运行数据、脖颈形状测量数据、地质条件、岩盐力学参数等资料，采用数值模拟分析、多臂井径仪测量、井下电视观察等手段对脖颈收缩原因进行了研究。【结果】2个腔体的生产运行情况均符合设计要求；数值模拟结果显示，在设计运行压力7~15 MPa范围内，脖颈半径的最大蠕变收缩量为7.62 mm，压力对脖颈收缩影响较小；多臂井径仪的测量结果与声呐测量数据基本相符，排除了测量出现误差的可能性；井下电视观察结果显示脖颈收缩处有大量盐结晶。【结论】盐穴储气库按照设计压力运行，可有效避免蠕变所引起的脖颈收缩；脖颈收缩主要由盐结晶导致，盐结晶主要由注采运行过程中凝析水附着在脖颈处引起岩盐重结晶导致。对此可采取优化监测手段及监测周期、优化脖颈段工艺设计、治理腔内残留卤水等手段对脖颈收缩进行预防，可采用连续油管射流清洗技术进行脖颈堵塞治理。

Abstract:: [Objective] During the mensuration of the pressurized cavity in the Jintan salt cavern gas storage in 2019, it was found that the neck of two injection-production gas wells had severe contraction. the volume contraction rates compared to the 2013 detection results were 66% and 72% respectively. In order to prevent further contraction of the neck, which may cause blockage of the neck segment channel and ensure the safe and stable operation of the injection and production gas, it is necessary to conduct research on the causes of neck contraction and propose targeted preventive and remedial measures. [Methods] By utilizing production and operational data from two cavities, as well as neck shape measurement data, geological data, and rock salt mechanical parameters, research was conducted to investigate the causes of neck contraction. This research took into account and drew upon research methods for studying the factors influencing cavity contraction in salt caverns. It involved using numerical simulation analysis, multi-arm well diameter measurement, and downhole TV observation to study the reasons for neck contraction. [Results] The production and operational conditions of these two cavities are in accordance with the design requirements. The numerical simulation results indicate that within the range of the designed operating pressure of 7 to 15 MPa, the maximum creep contraction of the neck radius is 7.62mm, which has a relatively small impact on neck contraction. The results of the multi-arm well diameter measurement are consistent with the measurements of sonar survey, which eliminates the possibility of measurement errors. The downhole TV observation results reveal the presence of a large number of salt crystals at the contracted section of the neck. [Conclusion] Analysis suggests that operating the salt cavern gas storage facility at the designed pressure can effectively prevent neck contraction caused by creep. The main reason for neck contraction is the formation of salt crystals, which is primarily caused by condensate water condensing and attaching to the neck during the injection-production operation process, leading to re-crystallization of the rock salt. To prevent neck contraction, optimization of monitoring methods and frequency, optimization of the neck segment process design, and treatment of residual brine in the cavity can be implemented. In addition, continuous tubing jet cleaning technology can be used to address neck blockages.

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更新日期/Last Update: 2024-06-20