【摘要】：套管柱強度分析及設計是鉆井設計的關鍵技術(shù),是關系到鉆井成本、油氣井連續(xù)穩(wěn)定生產(chǎn)的重要因素。目前,隨著油氣田勘探和開發(fā)技術(shù)的發(fā)展,套管深度的增加,套管下入層次的增多,套管的受力和變形越來越復雜,這就對套管設計提出了更高的要求。本文針對粘土吸水膨脹地層這種特殊的地質(zhì)條件,結(jié)合勝利坨142區(qū)塊的套管損壞情況,圍繞套管柱外部載荷、套管的三軸強度設計理論、套管非均載荷下的承載能力有限元仿真等內(nèi)容展開研究。本文首先分析了套管柱承受的外部載荷,根據(jù)總結(jié)的計算方法求出套管的有效內(nèi)壓力、有效外擠壓力及有效軸向力,為得到套管的雙軸強度和三軸強度及進行強度校核打下了基礎。然后推導了套管的雙軸強度和三軸強度計算公式,在進行套管柱設計時首先按照抗擠強度選擇套管型號,然后再通過抗內(nèi)壓強度和抗拉強度對套管強度進行校核,如果抗內(nèi)壓或抗拉強度不滿足設計要求,需要重新選擇套管進行抗內(nèi)壓強度設計,直到選出符合要求的套管為止。接著采用APDL語言建立了套管的參數(shù)化模型,設置非線性相關參數(shù),通過改變套管的壁厚,鋼級及加載長度,利用ANSYS有限元分析軟件的屈曲分析模塊對套管的承載能力進行仿真,針對套管的不同工況,得到承載能力隨套管徑向變形的變化曲線和套管的屈曲載荷,獲得非均載荷下套管的承載能力降低百分比,分析粘土吸水膨脹地層套管承載能力的變化規(guī)律。最后,給出了求解套管柱下入長度的算法并利用VB軟件開發(fā)了粘土吸水膨脹地層套管柱設計系統(tǒng),該軟件具有界面友好,操作簡單,數(shù)據(jù)管理全面,調(diào)用ANSYS軟件,直接輸出設計報告和強度曲線的功能�？梢詾殂@井設計工程師進行套管柱設計提供可靠的理論依據(jù)和有力的技術(shù)支持,對減少套管設計周期具有重要意義。
[Abstract]:The strength analysis and design of casing string is a key technology in drilling design and an important factor related to drilling cost and continuous and stable production of oil and gas wells. At present, with the development of exploration and development technology in oil and gas fields, the depth of casing increases, the casing level increases, and the stress and deformation of casing become more and more complex, which puts forward higher requirements for casing design. In this paper, according to the special geological conditions of clay water absorption and swelling formation, combined with the casing damage in Shengtuo 142 block, the theory of triaxial strength design of casing around the external load of casing string and casing is discussed in this paper. The finite element simulation of bearing capacity of casing under non-uniform load is studied. In this paper, the external load of casing string is analyzed, and the effective internal pressure, effective external extrusion pressure and effective axial force are calculated according to the calculation method. It lays a foundation for obtaining the biaxial strength and triaxial strength of casing and for strength checking. Then, the calculation formulas of biaxial and triaxial strength of casing are derived. The casing type is selected according to the strength of the casing string first, and then the strength of the casing is checked through the strength of internal pressure and tensile strength. If the internal pressure or tensile strength does not meet the design requirements, the casing shall be re-selected for the internal pressure strength design until the required casing is selected. Then the parametric model of casing is established by APDL language, and the nonlinear parameters are set up. By changing the wall thickness, steel grade and loading length of casing, the buckling analysis module of ANSYS finite element analysis software is used to simulate the bearing capacity of casing. According to the different working conditions of casing, the curve of bearing capacity with casing radial deformation and the buckling load of casing are obtained, and the percentage of casing bearing capacity under non-uniform load is obtained. The variation law of casing bearing capacity in clay water-absorbing and expanding formation is analyzed. Finally, an algorithm for calculating the length of casing string is given, and a casing string design system is developed by using VB software. The software has the advantages of friendly interface, simple operation, comprehensive data management, and the transfer of ANSYS software. Direct output design report and strength curve function. It can provide reliable theoretical basis and powerful technical support for casing string design of drilling design engineers. It is of great significance to reduce casing design cycle.
【學位授予單位】：中國石油大學(華東)
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE931.2

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本文編號：2210588