盐穴型地下储气库稳定性评价研究

发布时间：2018-09-07 17:42

【摘要】：近年来国内外盐穴型储气库失稳事件时有发生,经常出现储气库渗漏、储气库破坏以及地表沉降或坍塌等事故,造成了巨大的经济损失和环境破坏。我国盐矿具有盐层薄、埋藏浅、夹层多等特点,这使得盐穴型储库建库难度大、运行风险高,尤其是在溶腔稳定性管理方面急需进行深入研究并取得突破。因此,本文以金坛盐矿储气库为对象对储气库稳定性评价与管理进行了深入的研究,主要研究内容和取得的成果如下:(1)借鉴国内外储气库稳定性评价影响因素和技术,利用FLAC3D模拟统计出盐穴型地下储气库的主要失稳原因。对储气库稳定性影响的主要因素进行分析,以江苏金坛盐矿能源储气库为实际工程,利用层次分析法和模糊综合评价法相结合的方法逐层计算每层指标的稳定性水平,得出盐穴型地下储气库的稳定性和失稳后果的定量评价,以及对应的评价等级。而所采用的评分模型根据数值模拟结果结合相关研究所构建,显著减少了专家打分的主观评价模糊性所带来的误差。(2)采用层次分析法和模糊综合评价法相结合的方法对储气库失稳后果,储气库渗漏、储气库破坏以及地表沉降或坍塌等进行定量评价,预测出储气库失稳带来的后果,并根据评价结果的不同提出了降低或规避风险的措施。(3)根据建立的盐穴型地下储气库的稳定性评价方法和评价分级标准,基于C#编程技术,开发研制了一套具有针对性的“盐穴型地下储气库稳定性评价软件”,以提高评价的效率和准确性。保证在储气库失稳之前,辅助将各种风险因素消除或降到可接受范围之内,从而使储气库安全平稳地运行。本文通过对金坛盐岩能源储气库稳定性进行模拟计算,得出其稳定性最终得分为78.84分。当假设其最小运行压力小于3MPa,最大运行压力小于8MPa时,得分为53.55分,并预测出此时储气库失稳所带来的后果。该评价结果切合实际,且与相关盐穴型储气库稳定性评价结果相一致,为地下储气库运行管理提供实际参考。
[Abstract]:In recent years, instability of salt cavernous gas storage occurred from time to time at home and abroad. Leakage, destruction and ground subsidence or collapse of gas storage often occurred, which resulted in huge economic loss and environmental damage. The salt mines in China have the characteristics of thin salt layer shallow burial and many intercalations which make it difficult to build salt cavernous reservoirs and run high risk especially in the stability management of dissolved caverns it is urgent to make a thorough study and make a breakthrough. Therefore, this paper takes the Jintan Salt Mine gas storage as the object of in-depth study on the stability evaluation and management of gas storage, the main research contents and achievements are as follows: (1) draw lessons from the domestic and foreign gas reservoir stability evaluation factors and techniques, The main reasons of instability of salt cavernous underground gas storage are calculated by FLAC3D simulation. Based on the analysis of the main factors affecting the stability of gas storage, taking the energy storage of Jintan Salt Mine in Jiangsu Province as a practical project, the stability level of each layer index is calculated layer by using the method of combining analytic hierarchy process with fuzzy comprehensive evaluation method. The quantitative evaluation of the stability and instability consequences of salt cavernous underground gas storage is obtained, and the corresponding evaluation grade is obtained. The scoring model is based on the results of numerical simulation and related research. The error of subjective evaluation fuzziness caused by expert scoring is significantly reduced. (2) the method of AHP and fuzzy comprehensive evaluation is used to solve the problem of gas storage instability and gas reservoir leakage. The damage of gas storage and surface subsidence or collapse are quantitatively evaluated, and the consequences of instability of gas storage are predicted. According to the different evaluation results, the measures to reduce or avoid the risk are put forward. (3) according to the stability evaluation method and evaluation classification standard of salt cavernous underground gas storage, based on C # programming technology, A set of "salt cavernous underground gas storage stability evaluation software" has been developed in order to improve the efficiency and accuracy of evaluation. Before the storage tank is unstable, all kinds of risk factors can be eliminated or reduced to acceptable range, so that the storage tank can operate safely and smoothly. In this paper, the stability of Jintan salt rock energy storage reservoir is simulated and calculated, and the final score of stability is 78.84 points. When the minimum operating pressure is less than 3 MPA and the maximum operating pressure is less than 8MPa, the score is 53.55, and the consequence of the instability of gas storage is predicted. The evaluation results are practical and consistent with the results of the stability evaluation of the salt cavern type gas storage reservoir, which provides practical reference for the operation and management of underground gas storage reservoir.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE822

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