含夹层盐岩地下储气库运营期长期稳定性研究
发布时间：2018-01-10 23:34
本文关键词：含夹层盐岩地下储气库运营期长期稳定性研究 出处：《西南石油大学》2017年硕士论文 论文类型：学位论文
【摘要】：盐岩除了渗透率较低、蠕变特性良好外,还具有损伤及损伤自我恢复的特性,因此越来越多的地下储气库建造在盐岩层中,而我国的盐岩层中含有较多的泥岩夹层,随之会给盐岩储气库带来额外的问题。因此,为了保证含夹层盐岩地下储气库在运营过程中能够长期稳定运行,研究含夹层盐岩地下储气库运营期的长期稳定性就显得尤为重要。本文首先在总结归纳盐岩力学特性、蠕变特性以及盐岩应该满足的蠕变本构方程的基础上,选择了适用于本文研究的蠕变本构方程;其次,研究了储气库单腔运行内压、溶腔形状、夹层数量、夹层厚度、夹层倾角以及夹层刚度对其运营期长期稳定性的影响情况,并提出了相应的控制措施;再次,研究了储气库群运行内压、溶腔形状、夹层数量、夹层厚度、夹层倾角、夹层刚度、邻腔运行压力差以及相邻溶腔间距对其运营期长期稳定性的影响情况,并提出了相应的控制措施;最后,对给定工况的含夹层盐岩地下储气库单腔及储气库群长期运行过程中的稳定性进行了相应的综合评价,并提出了对储气库(群)溶腔建库以及运营管理有帮助的建议。本文主要完成了如下四个方面的研究工作:(1)对盐岩的力学特性、蠕变特性以及盐岩的蠕变本构方程进行了一定的梳理;结合本论文研究的含夹层盐岩选择了适用的蠕变本构方程,即cpower蠕变本构方程,将其作为本文数值模拟所使用的蠕变本构方程。(2)研究了含夹层盐岩地下储气库单腔受运行内压、溶腔形状以及夹层的影响情况。运行内压的增加对储气库溶腔蠕变过程中最大位移的减少是有利的;盐岩地下储气库最佳的溶腔形状为鸡蛋形溶腔;夹层数量越多对于含夹层盐岩储气库的抗变形能力总体上是越低的,此外还与夹层的位置相关;夹层厚度越大对于储气库溶腔抗变形能力总体上是越强的,但影响不明显;对单腔而言,夹层倾角在15°左右时最有利于储气库溶腔的稳定;软夹层会降低储气库溶腔的抗变形能力,硬夹层会相应地提高储气库溶腔抵抗变形的能力,等效夹层介于两者之间;在分析每个因素对储气库溶腔变形影响的同时,还提出了相应的控制措施。(3)研究了含夹层盐岩储气库群受运行内压、溶腔形状、夹层、邻腔运行压力差以及相邻溶腔间距的影响情况。运行内压的增加对含夹层盐岩储气库群溶腔蠕变过程中最大位移的减少是有利的;盐岩地下储气库群最佳的溶腔形状为鸡蛋形溶腔;夹层数量越多对于储气库群抗变形能力总体上是越低的,此外还与夹层的位置相关;夹层厚度越大对于储气库群溶腔抵抗变形能力总体上是越强的,但影响不明显;对储气库群而言,夹层倾角在12.5°左右时最有利于储气库群溶腔的稳定;软夹层会降低储气库群溶腔的抗变形能力,硬夹层会相应地提高储气库群溶腔抗变形能力,等效夹层介于两者之间;降低邻腔运行压力差能够增强储气库群溶腔的稳定性;相邻溶腔间距为2倍洞径时是较为合理的,既有利于储气库群溶腔的稳定又不会造成盐岩层资源的浪费;在分析每个因素对储气库群溶腔变形影响的同时,还提出了相应的控制措施。(4)综合评价了含夹层盐岩地下储气库(群)长期运营过程中的稳定性。本文首先构建了含夹层盐岩地下储气库(群)运营期长期稳定性评价体系,并根据计算得出的溶腔最大位移计算出了给定工况下的储气库溶腔及溶腔群稳定性评价指标的分项得分;其次通过熵权方法确定每个评价指标的客观权重,通过改进的层次分析法计算每个评价指标的主观权重;再次通过常权组合权重和变权组合权重以及每个评价指标的分项得分计算出了所评价储气库及储气库群的稳定性综合得分,较为客观地得出了其稳定性评价结果;最后,对储气库(群)溶腔建库期间及运营过程中存在的问题提出了相应有效的建议措施。本文的研究成果和思路能够为国内含夹层盐岩地下储气库(群)溶腔建库及运营管理在一定程度上提供有益的借鉴。
[Abstract]:In addition to salt rock with low permeability, good creep properties, also has the characteristics of self injury and recovery of injury, so more and more construction of underground gas storage in salt rock and mudstone interlayer and our salt rock contains more, it will bring additional problems for gas storage in salt rock. Therefore, in order to ensure laminated salt rock underground gas storage can be operated stably in the process of operation, the long term stability of laminated salt rock underground gas storage operation period is particularly important. This paper firstly summarized the mechanical properties of rock salt, basic creep constitutive equations and creep properties of rock salt should meet on the constitutive equation creep is selected for this study; secondly, study the gas storage operation of single cavity internal pressure, cavity shape, number of sandwich, sandwich thickness, interlayer angle and stiffness on the long-term stability of the sandwich operation period. Ring, and puts forward the corresponding control measures; thirdly, study the gas storage group operation pressure, cavity shape, number of sandwich, sandwich thickness, interlayer inclination, interlayer stiffness, adjacent cavity operating pressure difference and adjacent cavity spacing effect on the long-term stability of the operation situation, and put forward the control the corresponding measures; finally, the corresponding comprehensive evaluation on the stability of a given condition of bedded salt rock underground gas storage of single chamber and gas storages during long term operation, and proposed to the gas storage cavity (Group) construction and operation management of helpful suggestions. This paper has completed the following research work in the following four aspects: (1) the mechanical properties of rock salt, the creep of salt rock creep characteristics and constitutive equation were systematically analyzed; combined with the study of bedded salt rock and choose the suitable creep constitutive equation, namely Cpower creep constitutive equation The numerical simulation, the creep constitutive equations are used in this paper. (2) studied in laminated salt rock underground gas storage chamber by single operation pressure, cavity shape and dissection of the impact of the situation. The increase of the operation pressure of gas storage cavern in the creep process reduce the maximum displacement is favorable; underground salt rock gas storage cavity shape solution for the best egg shaped cavity; the more the number of interlayer for laminated salt rock gas storage anti deformation capacity is generally lower, in addition to the layer position related; interlayer thickness greater for gas storage cavern deformation resistance of total body is stronger, but the influence is not obvious; the single cavity, interbed dip at about 15 degrees when the most conducive to the gas storage cavern stability; soft interlayer can reduce the gas storage cavity of the anti deformation ability, hard interlayer will accordingly improve the capability of gas storage cavern deformation resistance, equivalent sandwich between Between the two; in the gas storage solution and cavity deformation of each factor analysis, also puts forward the corresponding control measures. (3) studied in laminated salt rock gas storage group by operation pressure, cavity shape, dissection, adjacent cavity operating pressure difference and influence of adjacent cavity spacing operation conditions. The internal pressure increase of laminated salt rock gas storage cavern group in the process of creep reduction of maximum displacement is favorable; salt rock underground gas storages shape of caverns for the best egg shaped cavity; the more the number of interlayer is the lower the gas storage group anti deformation ability on the whole, in addition to the sandwich location related; the greater the thickness of interlayer for gas storage group of cavity deformation resistance is generally stronger, but the influence is not obvious; the gas storage group, interbed dip at about 12.5 degrees when the most conducive to the gas storage cavern group stability; soft interlayer will reduce the dissolved gas storage group The anti deformation ability of the cavity, the hard layer will correspondingly increase gas storages cavity deformation resistance capacity, equivalent sandwich between two adjacent cavities; reduce operation pressure can enhance the stability of gas storage cavern group; adjacent cavity spacing is 2 times of the diameter of the tunnel is more reasonable, is conducive to the gas storage group cavern stability and salt rock will not cause waste of resources; in the analysis of each factor of gas storage group of cavity deformation, also puts forward the corresponding control measures. (4) a comprehensive evaluation of bedded salt rock underground gas storage (Group) long-term stability in the process of operation. This paper constructs the content dissection of underground salt rock gas storage (Group) during the operation of long-term stability evaluation system, and according to the maximum displacement of the calculated solution cavity calculated scores of gas storage under the given conditions of cavity and cavity group stability evaluation index; secondly by entropy Method of determining the objective weight of each evaluation index, the subjective weight is calculated for each evaluation index by AHP method; the sub score again through the constant weight combination weights and variable weights and combined weights of each evaluation index is calculated by the evaluation of gas storage and gas storage group stability comprehensive scores, objectively obtained its stability the evaluation results; finally, the gas storage (Group) exist during the course of construction and operation of cavity problems and puts forward the effective measures. To research results and ideas of this paper for laminated salt rock containing domestic underground gas storage (Group) solution provides a useful reference for building cavity and operation management in a certain extent.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE972.2
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本文编号：1407281
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