本文關(guān)鍵詞：含夾層鹽巖地下儲氣庫運營期長期穩(wěn)定性研究　出處：《西南石油大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鹽巖 夾層 儲氣庫 蠕變 穩(wěn)定性 綜合評價

【摘要】：鹽巖除了滲透率較低、蠕變特性良好外,還具有損傷及損傷自我恢復(fù)的特性,因此越來越多的地下儲氣庫建造在鹽巖層中,而我國的鹽巖層中含有較多的泥巖夾層,隨之會給鹽巖儲氣庫帶來額外的問題。因此,為了保證含夾層鹽巖地下儲氣庫在運營過程中能夠長期穩(wěn)定運行,研究含夾層鹽巖地下儲氣庫運營期的長期穩(wěn)定性就顯得尤為重要。本文首先在總結(jié)歸納鹽巖力學(xué)特性、蠕變特性以及鹽巖應(yīng)該滿足的蠕變本構(gòu)方程的基礎(chǔ)上,選擇了適用于本文研究的蠕變本構(gòu)方程;其次,研究了儲氣庫單腔運行內(nèi)壓、溶腔形狀、夾層數(shù)量、夾層厚度、夾層傾角以及夾層剛度對其運營期長期穩(wěn)定性的影響情況,并提出了相應(yīng)的控制措施;再次,研究了儲氣庫群運行內(nèi)壓、溶腔形狀、夾層數(shù)量、夾層厚度、夾層傾角、夾層剛度、鄰腔運行壓力差以及相鄰溶腔間距對其運營期長期穩(wěn)定性的影響情況,并提出了相應(yīng)的控制措施;最后,對給定工況的含夾層鹽巖地下儲氣庫單腔及儲氣庫群長期運行過程中的穩(wěn)定性進(jìn)行了相應(yīng)的綜合評價,并提出了對儲氣庫(群)溶腔建庫以及運營管理有幫助的建議。本文主要完成了如下四個方面的研究工作:(1)對鹽巖的力學(xué)特性、蠕變特性以及鹽巖的蠕變本構(gòu)方程進(jìn)行了一定的梳理;結(jié)合本論文研究的含夾層鹽巖選擇了適用的蠕變本構(gòu)方程,即cpower蠕變本構(gòu)方程,將其作為本文數(shù)值模擬所使用的蠕變本構(gòu)方程。(2)研究了含夾層鹽巖地下儲氣庫單腔受運行內(nèi)壓、溶腔形狀以及夾層的影響情況。運行內(nèi)壓的增加對儲氣庫溶腔蠕變過程中最大位移的減少是有利的;鹽巖地下儲氣庫最佳的溶腔形狀為雞蛋形溶腔;夾層數(shù)量越多對于含夾層鹽巖儲氣庫的抗變形能力總體上是越低的,此外還與夾層的位置相關(guān);夾層厚度越大對于儲氣庫溶腔抗變形能力總體上是越強(qiáng)的,但影響不明顯;對單腔而言,夾層傾角在15°左右時最有利于儲氣庫溶腔的穩(wěn)定;軟夾層會降低儲氣庫溶腔的抗變形能力,硬夾層會相應(yīng)地提高儲氣庫溶腔抵抗變形的能力,等效夾層介于兩者之間;在分析每個因素對儲氣庫溶腔變形影響的同時,還提出了相應(yīng)的控制措施。(3)研究了含夾層鹽巖儲氣庫群受運行內(nèi)壓、溶腔形狀、夾層、鄰腔運行壓力差以及相鄰溶腔間距的影響情況。運行內(nèi)壓的增加對含夾層鹽巖儲氣庫群溶腔蠕變過程中最大位移的減少是有利的;鹽巖地下儲氣庫群最佳的溶腔形狀為雞蛋形溶腔;夾層數(shù)量越多對于儲氣庫群抗變形能力總體上是越低的,此外還與夾層的位置相關(guān);夾層厚度越大對于儲氣庫群溶腔抵抗變形能力總體上是越強(qiáng)的,但影響不明顯;對儲氣庫群而言,夾層傾角在12.5°左右時最有利于儲氣庫群溶腔的穩(wěn)定;軟夾層會降低儲氣庫群溶腔的抗變形能力,硬夾層會相應(yīng)地提高儲氣庫群溶腔抗變形能力,等效夾層介于兩者之間;降低鄰腔運行壓力差能夠增強(qiáng)儲氣庫群溶腔的穩(wěn)定性;相鄰溶腔間距為2倍洞徑時是較為合理的,既有利于儲氣庫群溶腔的穩(wěn)定又不會造成鹽巖層資源的浪費;在分析每個因素對儲氣庫群溶腔變形影響的同時,還提出了相應(yīng)的控制措施。(4)綜合評價了含夾層鹽巖地下儲氣庫(群)長期運營過程中的穩(wěn)定性。本文首先構(gòu)建了含夾層鹽巖地下儲氣庫(群)運營期長期穩(wěn)定性評價體系,并根據(jù)計算得出的溶腔最大位移計算出了給定工況下的儲氣庫溶腔及溶腔群穩(wěn)定性評價指標(biāo)的分項得分;其次通過熵權(quán)方法確定每個評價指標(biāo)的客觀權(quán)重,通過改進(jìn)的層次分析法計算每個評價指標(biāo)的主觀權(quán)重;再次通過常權(quán)組合權(quán)重和變權(quán)組合權(quán)重以及每個評價指標(biāo)的分項得分計算出了所評價儲氣庫及儲氣庫群的穩(wěn)定性綜合得分,較為客觀地得出了其穩(wěn)定性評價結(jié)果;最后,對儲氣庫(群)溶腔建庫期間及運營過程中存在的問題提出了相應(yīng)有效的建議措施。本文的研究成果和思路能夠為國內(nèi)含夾層鹽巖地下儲氣庫(群)溶腔建庫及運營管理在一定程度上提供有益的借鑒。
[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.

【學(xué)位授予單位】：西南石油大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TE972.2
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本文編號：1407281