Residual Life Study of Coiled Tubing for Erosion Wear
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TECHNICAL ARTICLE—PEER-REVIEWED
Residual Life Study of Coiled Tubing for Erosion Wear Yiwei Zhang . Qiang Luo . Haibao Wang . Xiaoxiang Gong . Long-Long Guo
Submitted: 6 August 2020 / in revised form: 4 October 2020 / Accepted: 17 October 2020 Ó ASM International 2020
Abstract Erosion wear will cause corrosion pits, local thinned area, micro-fracture and other defects for coiled tubing’s, resulting in shortened service life. Discrete phase of sand particles was obtained under the Lagrangian coordinates. This model was applied to study the erosion law of CT’s outer wall, such as curved tube and straight tube, the mass flow, the size of sand particle, the inject pressure, the volume of fracturing fluid injection and the viscosity of fracturing fluid. Keywords Coiled tubing Two-phase flow Erosion Annular sand fracturing
Introduction To realize the economic growth and solve the serious problem of ‘‘multi-well low-production,’’ horizontal well is used widely in the low-permeability reservoir. The Y. Zhang (&) Q. Luo H. Wang X. Gong Mechanical Engineering College, Chongqing Three Gorges University, Chongqing 404000, People’s Republic of China e-mail: [email protected] Y. Zhang X. Gong Chongqing Engineering Technology Research Center for Light Alloy and Processing, Chongqing 404000, People’s Republic of China Q. Luo Chongqing Engineering Research Center for Advanced Intelligent Manufacturing Technology, Chongqing 404000, People’s Republic of China L.-L. Guo Mechanical Engineering College, Xi’an Shiyou University, Xi’an 710065, People’s Republic of China
technology of CT during horizontal annular delivery sand fracturing is a new measure to realize reservoir stimulation in the way of injecting sand through annulus and injecting the balance fluid through CT. The technology of CT has been used widely in horizontal well fracturing for the advantage of the lower requirement of fracturing fluid, greatly extending the life of nozzle, large displacement construction and so forth. However, the sand-carrying liquid can cause severe erosion in CT’s outer wall and even lead to failure of CT, when the sand-carrying liquid goes through the annulus with high speed [1, 2]. Many scholars have researched erosion wear. For instance, Tilly made a erosion test with the shock velocity of up to 550 m/s and the particle diameter of 1000 lm, and a two-stage mechanism of ductile erosion was put forward [3]. Bitter developed a erosion model by means of erosion corrosion and small angle cutting corrosion of large angle erosion [4]. Liebhard and Levy found the surface erosion rate increases with the decrease of solid particle mesh, and the erosion rate increased or decreased slowly when the mesh of solid particle continued to decrease [5]. Gavin pointed out that the corrosion in the continuous tubes came from three mechanisms [6]. Shah and Jain studied the erosion corrosion of CT in the drum and pointed out that the erosion corrosion in the continuous tubes was highly non-uniform [7]. Newman discussed the limitations of coiled
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