水平井套管摩阻计算与可下入性分析

发布时间：2018-06-05 16:05

本文选题：水平井 + 套管　；参考：《西南石油大学》2015年硕士论文

【摘要】：随着水平井技术的发展,水平井套管柱的设计和安全施工关系到一口井的完成和采油、增产、修井等后续工程的正常实施,是油气井工程技术的重要领域。水平井具有一定长度的水平位移并且造斜井段井眼曲率大,套管柱在下入过程中的受力较为复杂,必须要对套管柱在下入过程中的摩阻力、下入过程强度问题进行分析和计算,为现场水平井钻井工程设计(包括钻井设备选择、井眼轨迹参数、管柱设计、管柱下入设计等)、施工安全(井眼轨迹控制、管柱下入、井下作业等)提供科学合理的意见和必要的技术支持。本文针对水平井套管摩阻计算及可下入性进行了系统分析和研究,主要开展了以下研究工作： (1)利用三次样条插值方法对实测井眼轨迹进行了拟合,根据拟合的井眼轨迹数据,建立了套管摩阻力学模型,模型考虑了钻井液黏滞阻力、压差阻力和下套管过程中可能产生的动载荷等因素的影响。 (2)考虑井眼曲率对套管下入的影响,计算了不同规格的套管可以通过的最大井眼曲率,并运用刚性几何相容模型分析计算一定曲率下单根套管可以通过的最大长度,确保套管能顺利通过最大曲率井段。 (3)根据套管柱下入的具体力学条件,研究下入过程中管柱的内压力、外挤力、轴向力,按照第四强度理论对入井套管柱进行强度校核,对套管柱下入的安全性进行分析研究。 (4)利用以上研究成果,采用VB6.0程序语言,编制了水平井套管下入可行性分析软件,对研究工区的一口水平井进行了套管下入可行性分析,应用表明,计算结果和现场实测结果的误差在合理范围内,证明该模型是可靠的,能够预测管柱下入摩阻及轴向力,对判断套管柱能否顺利下入提供理论依据,同时,结合现场下套管的施工情况,提出了该区块套管下入的技术措施。
[Abstract]:With the development of horizontal well technology, the design and safe construction of casing string in horizontal well is related to the completion of a well and the normal implementation of subsequent projects such as oil production, production increase, workover and so on, which is an important field of oil and gas well engineering technology. Horizontal wells have a certain length of horizontal displacement and the borehole curvature of inclined well section is large, and the casing string is subjected to more complicated forces in the process of downgoing, so it is necessary to analyze and calculate the friction resistance and the strength of the casing string in the process of downgoing. For site horizontal well drilling engineering design (including drilling equipment selection, wellbore trajectory parameters, string design, string entry design, etc.), construction safety (wellbore trajectory control, string entry, etc.) Provide scientific and reasonable advice and necessary technical support. In this paper, the calculation of casing friction and the funnability of horizontal well casing are systematically analyzed and studied, and the following research work is mainly carried out: 1) the measured borehole trajectory is fitted by cubic spline interpolation method. According to the fitted borehole trajectory data, the casing friction model is established, and the viscous resistance of drilling fluid is taken into account in the model. The pressure differential resistance and the possible dynamic load in the casing process. (2) considering the influence of borehole curvature on casing entry, the maximum borehole curvature of casing with different specifications is calculated, and the maximum length of casing which can be passed by certain curvature is calculated by using rigid geometric compatibility model. Ensure the casing can pass through the maximum curvature section smoothly. 3) according to the specific mechanical conditions of casing string entry, the internal pressure, external squeezing force and axial force of string are studied. According to the fourth strength theory, the strength of casing string is checked, and the safety of casing string under casing string is analyzed and studied. 4) based on the above research results and VB6.0 program language, the feasibility analysis software of casing down in horizontal well is developed, and the feasibility analysis of casing entry in a horizontal well in the study area is carried out. The application shows that, It is proved that the model is reliable, which can predict the frictional resistance and axial force under the pipe string and provide a theoretical basis for judging whether the casing string can enter smoothly. Combined with the field casing operation, the technical measures of casing down in this block are put forward.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE931.2

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