连续管冲蚀磨损及剩余寿命研究

发布时间：2018-04-10 14:43

本文选题：水力压裂 + 连续管　；参考：《西南石油大学》2017年硕士论文

【摘要】：随着水平井在低渗透油气藏中的广泛使用,以及连续管技术的快速发展,连续管压裂技术以其灵活的拖动性和水力喷射射孔定点压裂的优越性开始被广泛应用于水平井压裂中。连续管压裂技术主要是利用高压泵将具有较高粘度的压裂液通过连续管或环空注入油层中,但在压裂过程中高速通过的压裂液会对连续管的管壁造成剧烈冲击,导致连续管管壁冲蚀磨损。冲蚀磨损使得连续管管壁变薄、出现蚀坑以及微裂纹,在多种载荷的耦合作用下,连续管冲蚀磨损较严重部位易发生塑性变形、穿孔甚至断裂失效,导致压裂作业失败甚至作业井报废。本文针对连续管水力压裂技术中,连续管在高速压裂液的冲蚀磨损下容易失效的问题,查阅国内外连续管水力压裂技术及冲蚀磨损研究的相关文献,利用流体力学CFD技术对连续管水力压裂技术中连续管管壁的冲蚀磨损进行研究,并结合冲蚀磨损与剩余寿命关系模型,对连续管剩余服役时间进行预测,进而提出延长连续管使用寿命的相关建议。论文主要从以下几个方面开展研究工作:(1)对国内外连续管水力压裂及冲蚀磨损研究现状进行总结归纳,提炼有利于连续管水力压裂作业中连续管冲蚀磨损研究的相关内容。(2)通过数值计算结果与实验研究结果进行对比,结合冲蚀磨损理论,建立可行的连续管冲蚀磨损数值模型。并将数值计算的连续管冲蚀磨损结果与剩余使用寿命相结合,建立用于揭示连续管冲蚀磨损规律的剩余使用寿命预测模型。(3)利用连续管冲蚀磨损数值模型,并结合剩余寿命预测模型,研究连续管水力压裂技术中不同加砂方式下连续管的冲蚀磨损规律。旨在发现各参数对连续管冲蚀磨损的规律及其冲蚀磨损较严重部位。(4)基于流固耦合理论对连续管振动状态下的冲蚀磨损进行研究分析,并与未考虑耦合作用的连续管冲蚀磨损进行简要对比。(5)利用连续管冲蚀磨损数值模型对含缺陷的连续管冲蚀进行研究,得出缺陷参数对连续管冲蚀磨损的规律并完成各参数的主因次分析,找出造成含缺陷连续管冲蚀加剧的主要因素。本文的研究工作,有利于揭示水力压裂作业中连续管冲蚀磨损机理,得出不同参数及不同工作状态对连续管冲蚀的规律并指导现场作业,有效减轻水力压裂中连续管的冲蚀磨损,并结合剩余寿命预测模型,为合理使用磨损后的连续管起到一定指导作用。
[Abstract]:With the wide use of horizontal wells in low permeability reservoirs and the rapid development of continuous pipe technology, continuous tube fracturing technology has been widely used in horizontal well fracturing due to its flexible traction and the advantages of hydraulic jet perforation fixed point fracturing.Causes erosion wear of the tube wall.Erosion wear makes the tube wall thinning, corrosion pits and micro-cracks appear. Under the coupling of various loads, plastic deformation, perforation and even fracture are easy to occur in the more serious erosion-wear part of the continuous pipe.The failure of fracturing operation and even the scrapping of working wells.Aiming at the problem that the continuous pipe is easy to fail under the erosion and wear of high speed fracturing fluid in the hydraulic fracturing technology of continuous pipe, the relevant literature on hydraulic fracturing technology and erosion wear of continuous pipe at home and abroad is consulted in this paper.The erosion wear of continuous pipe wall in hydrofracturing technology is studied by using hydrodynamic CFD technique. Combined with the model of the relationship between erosion wear and residual life, the remaining service time of continuous pipe is predicted.Furthermore, some suggestions for prolonging the service life of continuous pipe are put forward.In this paper, the current research situation of hydraulic fracturing and erosion wear of continuous pipes at home and abroad is summarized and summarized from the following aspects.The relevant contents of erosion wear study of continuous pipe in hydraulic fracturing are refined. The numerical model of erosion wear of continuous pipe is established by comparing the numerical results with the experimental results and combining with the theory of erosion wear.Combining the calculated erosion wear results of coiled tubes with the residual service life, a prediction model of residual service life used to reveal the law of erosion wear of coiled tubes is established, and the numerical model of erosion wear of coiled tubes is established by means of the numerical model of erosion wear of coiled tubes.Combined with the residual life prediction model, the erosion and wear rules of continuous pipe under different sand adding methods in hydraulic fracturing technology of continuous pipe are studied.The aim of this paper is to find out the law of erosion wear of coiled tube and its serious erosive wear part. (4) based on fluid-solid coupling theory, the erosion wear of continuous tube under vibration state is studied and analyzed.A brief comparison of erosion wear of coiled tubes without coupling is made. 5) A numerical model of erosion wear of coiled tubes is used to study the erosion of coiled coiled tubes.The law of erosion and wear of continuous tube by defect parameters is obtained and the principal cause of each parameter is analyzed. The main factors causing erosion of continuous tube containing defects are found out.The research work in this paper is helpful to reveal the erosion and wear mechanism of continuous pipe in hydraulic fracturing operation, to obtain the law of erosion of continuous pipe under different parameters and different working conditions, and to guide field operation.The erosion wear of the coiled pipe in hydraulic fracturing is reduced effectively and the residual life prediction model is used to guide the reasonable use of the worn coiled pipe.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE934.2

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