连续油管水力喷射压裂管柱受力及冲蚀分析

发布时间：2018-06-02 18:06

本文选题：连续油管 + 水力喷射　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：连续油管水力喷射压裂技术是一种新型的水力压裂技术,集合了连续管技术、水力喷射压裂技术的特点,具有作业周期短,起下钻次数少,无需机械封隔和射孔工具,可实现压裂和水力喷射射孔联作,一趟管柱可以进行多段压裂的优点。连续油管水力喷射压裂技术将在页岩气开发方面有着广泛的应用前景。然而连续油管刚度小,较难承受纵向压缩载荷,容易失稳而产生正弦或螺旋屈曲。另外,在压裂加砂过程中砂粒也对连续油管产生了严重的冲蚀。因此,掌握连续油管在定向井或水平井中的受力特性和连续油管冲蚀规律非常重要,这关系到连续油管技术在我国应用领域的扩大和推广。针对这一问题本文主要做了以下工作。(1)连续油管水力喷射压裂管柱力学模型建立。首先采用三次样条曲线模型拟合井眼轨迹,将离散的测井数据拟合成一条光滑的空间曲线。然后在考虑了摩擦力、液压力、支持力、重力等载荷的情况下分别应用静力平衡法和能量法建立了连续油管的变形微分方程。(2)连续油管水力喷射压裂管柱微分方程的求解。首先对连续油管水力喷射压裂管柱微分方程进行了合理的化简。之后求解出了连续油管在正弦屈曲和螺旋屈曲的临界解。求解出了在不同空间状态下连续油管所受的正压力、剪切力和弯矩力。(3)压裂管柱应力、伸长(缩短)及可下入性分析。应用第四强度理论分析了连续油管的应力。充分考虑了轴向载荷的拉伸或压缩、热伸长、因液压力而伸长、由于螺旋弯曲而缩短的情况下,分析了连续油管总的伸长量。分析了压裂工具所能通过的最大井眼曲率。(4)在理论分析和建立的数学模型的基础上,利用VB计算机语言开发出连续油管水力喷射压裂管柱受力分析软件。(5)连续油管的冲蚀分析。基于软件FLUENT,利用DPM模型对连续油管水力压裂作业过程中连续油管的冲蚀进行数值模拟研究,重点研究压裂加砂作业时绞车处缠绕连续油管及造斜段及鹅颈架处的冲蚀机理。
[Abstract]:Continuous tubing hydraulic injection fracturing is a new type of hydraulic fracturing technology, which integrates the continuous pipe technology. The hydraulic injection fracturing technology has the characteristics of short operation period, less drilling times and no need for mechanical sealing and perforating tools. The combination of fracturing and hydraulic injection perforation can be realized, and the advantages of multiple fracturing can be carried out by one string. Continuous tubing hydraulic injection fracturing technology will be widely used in shale gas development. However, the continuous tubing is difficult to withstand longitudinal compression load because of its small stiffness, and it is easy to destabilize and cause sinusoidal or spiral buckling. In addition, sand grains also cause serious erosion of continuous tubing during fracturing and sand adding. Therefore, it is very important to master the mechanical characteristics of coiled tubing in directional well or horizontal well and the erosion law of coiled tubing, which is related to the expansion and popularization of coiled tubing technology in the field of application in our country. In order to solve this problem, the main work of this paper is as follows: 1) the mechanical model of hydraulic injection fracturing pipe string of continuous tubing is established. First, the cubic spline curve model is used to fit the borehole trajectory, and the discrete logging data are fitted into a smooth spatial curve. Then, the differential equations of hydrodynamic fracturing string of continuous tubing are established by using static equilibrium method and energy method, respectively, considering friction, hydraulic pressure, supporting force and gravity, etc. At first, the differential equation of hydraulic injection fracturing pipe string of continuous tubing is simplified reasonably. Then the critical solutions of sinusoidal buckling and spiral buckling of continuous tubing are obtained. The stress, elongation (shortening) and down-entry analysis of continuous tubing subjected to normal pressure, shear force and bending moment force under different space conditions are obtained. The stress of continuous tubing is analyzed by the fourth strength theory. The total elongation of continuous tubing is analyzed when the axial load is stretched or compressed thermal elongation is elongated due to liquid pressure and the total elongation of continuous tubing is analyzed because of spiral bending. On the basis of theoretical analysis and mathematical model established, the force analysis software of continuous tubing hydraulic jet fracturing string, I. e., No. 5), is developed by using VB computer language. Based on software fluent, the erosion mechanism of continuous tubing in hydraulic fracturing process of continuous tubing was studied by using DPM model, and the erosion mechanism of winding coiled tubing and inclined section and goose neck frame in hydraulic fracturing and sand adding operation was studied.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE934.2

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