多靶点定向井套管下入能力判定和下入条件优化研究

发布时间：2018-03-06 16:41

本文选题：定向井　切入点：套管下入　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：多靶点定向井的套管串下入过程中,由于套管串其自身结构以及重力、井眼曲率、井斜、井径扩大率、刚性、弹性扶正器等因素,致使管柱串下入过程中发生变形,导致不同井深处的套管居中度发生变化,同时引起套管的摩阻力增加,致使套管串难以下入井底。为此,我们将通过管柱串力学模型的建立和理论分析方法对该问题进行研究。针对套管串下入难的问题,建立了多靶点定向井套管串整体结构受力状态力学分析模型,运用多靶点定向井套管串受力分析理论与方法、定向井套管串下入过程的有限元分析,对多靶点定向井套管串下入状况动态进行判断,得出套管串下入条件优化理论与方法,根据此方法做出套管下入能力判定、下入条件优化方法和效果评价程序编制。本文对多靶点定向井套管串下入状况动态进行研究,根据下入状态做出套管串下入条件优化理论方法。用所编制的套管下入能力判定、下入条件优化方法和效果评价软件对现场喇2-斜PS2916井、喇2-斜PS2728井、喇2-斜PS2828井及喇3-斜PS2805井进行力学计算,得到4口井优化前后的弹性、刚性扶正器位置、个数以及套管串总的累积摩阻力,保证了4口五段制定向井、正常工况下套管下入。
[Abstract]:In the process of casing string entry in multi-target directional wells, due to its own structure, gravity, borehole curvature, well deviation, well diameter expansion rate, rigidity, elastic centralizer and so on, the string string is deformed. It leads to the change of casing centrality in different well depths, and the increase of casing friction, which makes it difficult for casing string to enter the bottom hole. We will study this problem through the establishment of string mechanics model and the theoretical analysis method. Aiming at the problem of casing string entering difficulty, a mechanical analysis model of the stress state of multi-target directional well casing string is established. Based on the theory and method of casing string stress analysis in multi-target directional wells, the finite element analysis of casing string entry process in directional wells is used to judge the dynamic state of casing string entry in multi-target directional wells, and the optimization theory and method of casing string entry conditions are obtained. According to this method, the determination of casing casing entry ability, the optimization method of casing entry condition and the programming of effect evaluation program are made. In this paper, the performance of casing string entry in multi-target directional wells is studied. According to the down-entry condition, the theoretical method of casing string entry condition optimization is made. With the developed casing entry ability, the down-entry condition optimization method and the effect evaluation software, the field ra2-skew PS2916 well, the La 2-inclined PS2728 well, are used to determine the casing entry ability, and the effect evaluation software is applied to the field ra2-oblique PS2728 well. The mechanical calculation of La _ 2-skew PS2828 well and La _ 3-oblique PS2805 well is carried out, and the elasticity, the position of rigid centralizer, the number and the total cumulative friction of casing string are obtained before and after the optimization of four wells, which ensures the four five-section directional wells and the casing under normal conditions.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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