稠油热采双管封隔器关键问题的研究
发布时间：2018-09-01 10:44
【摘要】：随着石油工业的发展,轻质原油所占比重逐渐下降,重质原油比重上升,这一变化带来了油田现场需要针对重质原油的开采进行新技术的开发。重质原油常被称为稠油。针对稠油特有的在高温下粘度大幅下降并利于原油的开采的性质,油田现场主要采用热采方式进行稠油开采。稠油热采中,常用的开采方式是蒸汽吞吐技术,然而现在针对稠油开采的专用工具的研究相对较少。蒸汽吞吐技术需要将高温气体的热能尽可能高效的传递给稠油,在传递过程中需要进行油层的封隔,石油开采过程中常采用封隔器进行环空封隔作用。稠油热采工艺中,热采封隔器也是常用工具之一,其在稠油热采中作用主要是将热蒸汽封隔在油层中,利于蒸汽与油层之间的热交换,实现稠油降粘作用。国内外针对此种工况下热采封隔器的研究相对较少。本文在上述背景下,针对现有稠油热采工艺的流程及特有工况进行一种新型的稠油热采用双管封隔器关键技术的研究。主要研究内容如下：(1)研究现有热采封隔器与常规封隔器结构上的差异及比较其优缺点,对比分析不同双管封隔器的结构,结合稠油热采工艺流程,选用适合稠油热采双管封隔器的结构；(2)针对稠油热采工况及双管封隔器结构的力学分析,选取双管封隔器中胶筒进行力学分析,按照有限元建模要求并针对胶筒的结构进行有限元建模；(3)利用有限元法分析常温下封隔器坐封过程,得到封隔器胶筒总成的变形量、胶筒内部的等效应力及胶筒与套管的接触应力,基于分析结果进行封隔器胶筒性能判定,结合材料力学特性及相关理论,提出封隔器可行性判定条件,为后续关于高温下封隔器胶筒总成的分析提供对比标准；(4)胶筒所用橡胶材料在不同温度下的物理特性,结合热固耦合用的数学模型,模拟胶筒总成在稠油热采工艺实际工况(高温300℃)下的总体变形、内部等效应力以及胶筒与套管之间的接触应力。基于高温下模拟出的结果与常温下模拟结果进行对比,得出高温工况下胶筒压缩量变大,内部等效应力以及与套管接触应力均有所下降。(5)通过不同温度下有限元分析的对比得出,高温下胶筒变形量变大,利于胶筒的变形、胶筒内部等效应力变小,出现破坏的可能性降低、接触应力变小后对胶筒的密封性能相对降低但也可以完成封隔作用。
[Abstract]:With the development of petroleum industry, the proportion of light crude oil decreases gradually, and the proportion of heavy crude oil increases. Heavy crude oil is often called heavy oil. In view of the characteristic of heavy oil, the viscosity of heavy oil decreases greatly at high temperature and is favorable to crude oil recovery, thermal recovery is mainly used in the field to produce heavy oil. Steam huff and puff technology is commonly used in heavy oil thermal recovery, but there are few researches on special tools for heavy oil recovery. Steam huff and puff technology needs to transfer the heat energy of high temperature gas to heavy oil as efficiently as possible. Thermal recovery Packer is also one of the commonly used tools in heavy oil thermal recovery process. Its main role in heavy oil thermal recovery is to seal the hot steam in the reservoir, which is conducive to the heat exchange between the steam and the reservoir, and to realize the viscous reduction of heavy oil. At home and abroad, there is relatively little research on thermal Packer under this condition. Under the above background, a new type of heavy oil heat using double pipe Packer key technology is studied according to the existing heavy oil thermal recovery process and its specific working conditions. The main research contents are as follows: (1) the differences between the existing thermal recovery Packer and the conventional Packer are studied and their advantages and disadvantages are compared. The structure of different double-pipe Packer is compared and analyzed, combined with the heavy oil thermal recovery process. Choose the structure of double pipe Packer suitable for heavy oil thermal recovery. (2) according to the mechanical analysis of heavy oil thermal recovery condition and double pipe Packer structure, select the rubber cylinder in double-tube Packer for mechanical analysis. According to the requirements of finite element modeling and finite element modeling for the structure of plastic cylinder; (3) using the finite element method to analyze the Packer sealing process at room temperature to obtain the deformation of the Packer rubber tube assembly. The equivalent stress inside the rubber cylinder and the contact stress between the rubber cylinder and the casing are used to judge the performance of the Packer rubber tube based on the analysis results. Combining with the mechanical properties of materials and related theories, the feasibility judgment conditions of the Packer are put forward. It provides a comparative standard for the subsequent analysis of the Packer rubber assembly at high temperature. (4) the physical properties of rubber materials used in rubber cylinders at different temperatures, combined with the mathematical model of thermal-solid coupling, The total deformation, the internal equivalent stress and the contact stress between the cylinder and the casing are simulated under the actual condition of heavy oil thermal recovery (high temperature 300 鈩，
本文编号：2216949
[Abstract]:With the development of petroleum industry, the proportion of light crude oil decreases gradually, and the proportion of heavy crude oil increases. Heavy crude oil is often called heavy oil. In view of the characteristic of heavy oil, the viscosity of heavy oil decreases greatly at high temperature and is favorable to crude oil recovery, thermal recovery is mainly used in the field to produce heavy oil. Steam huff and puff technology is commonly used in heavy oil thermal recovery, but there are few researches on special tools for heavy oil recovery. Steam huff and puff technology needs to transfer the heat energy of high temperature gas to heavy oil as efficiently as possible. Thermal recovery Packer is also one of the commonly used tools in heavy oil thermal recovery process. Its main role in heavy oil thermal recovery is to seal the hot steam in the reservoir, which is conducive to the heat exchange between the steam and the reservoir, and to realize the viscous reduction of heavy oil. At home and abroad, there is relatively little research on thermal Packer under this condition. Under the above background, a new type of heavy oil heat using double pipe Packer key technology is studied according to the existing heavy oil thermal recovery process and its specific working conditions. The main research contents are as follows: (1) the differences between the existing thermal recovery Packer and the conventional Packer are studied and their advantages and disadvantages are compared. The structure of different double-pipe Packer is compared and analyzed, combined with the heavy oil thermal recovery process. Choose the structure of double pipe Packer suitable for heavy oil thermal recovery. (2) according to the mechanical analysis of heavy oil thermal recovery condition and double pipe Packer structure, select the rubber cylinder in double-tube Packer for mechanical analysis. According to the requirements of finite element modeling and finite element modeling for the structure of plastic cylinder; (3) using the finite element method to analyze the Packer sealing process at room temperature to obtain the deformation of the Packer rubber tube assembly. The equivalent stress inside the rubber cylinder and the contact stress between the rubber cylinder and the casing are used to judge the performance of the Packer rubber tube based on the analysis results. Combining with the mechanical properties of materials and related theories, the feasibility judgment conditions of the Packer are put forward. It provides a comparative standard for the subsequent analysis of the Packer rubber assembly at high temperature. (4) the physical properties of rubber materials used in rubber cylinders at different temperatures, combined with the mathematical model of thermal-solid coupling, The total deformation, the internal equivalent stress and the contact stress between the cylinder and the casing are simulated under the actual condition of heavy oil thermal recovery (high temperature 300 鈩，
本文编号：2216949
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