Hydrostatic Experimental Study and Failure Mechanism of Glass Fiber Reinforced Thermoplastic Pipes Used for Oilfields
The traditional carbon steel pipe has been unable to meet the needs of high corrosive media oil and gas production since the gradual increase of the moisture content, and the increasingly severe corrosion environment during the deepening of the oil and gas field development process. In such situation, the reinforced thermoplastic pipe, as a typical non-metallic pipe, has become important solution for corrosion protection, and used in oil and gas gathering and transportation widely. In this study, the residual strength of reinforced thermoplastic pipe for oil and gas gathering and transportation was studied by using hydrostatic pressure residual strength method based on linear regression using pressure composite device with inner lining of PVDF and reinforced layer of glass fiber reinforced resin tape. The damage mechanism of the flexible composite pipe was studied by means of scanning electron microscopy. The results showed that the residual strength of the flexible composite pipe decreased with the increase of service time, and the logarithmic value was linear with the service time. The damage mechanism of the reinforcement layer was similar to that of the composite material, which was composed of four stages: matrix cracking, crack propagation, delaminating and fiber fracture.
KeywordsGathering and transportation Reinforced thermoplastic pipe Hydrostatic pressure-residual strength Linear regression Damage mechanism
The project was supported by the National Natural Science Foundation of China (Grant No. 51304236).
- 2.Q.I. Dongtao, L.I. Houbu, Application and qualification of reinforced thermoplastic pipes in Chinese oilfields. International Conference on Pipelines and Trenchless Technology (ICPTT) (ASCE, Reston, Beijing, China, 2011), 26–29 October 2011Google Scholar
- 3.Wei Bin, Qi Dongtao, Li Houbu et al., Corrosion resistance of reinforced thermoplastic pipe in the sour environment. Nat. Gas Ind. 35(06), 87–92 (2015)Google Scholar
- 5.E.H. Fisher, A.G. Gibson, Continuous fiber reinforced thermoplastic pipes for transport and distribution of fluids for the oil and gas industries. Plast. Rubber Compos. 27(10), 447–451 (1999)Google Scholar
- 6.GB/T 18252-2000, Plastic piping and ducting systems-determination of the long-term hydrostatic strength of thermoplastics materials in pipe form by extrapolation Google Scholar
- 7.GB/T 6111-2003, Thermoplastics pipes for the conveyance of fluids-resistance to internal pressure-test methodGoogle Scholar
- 8.SY/T 6794-2010, Qualification of spoolable reinforced plastic line pipeGoogle Scholar
- 9.GB/T 15560-1995, Standard test method for short-time hydraulic failure and resistance to constant internal pressure of the plastics pipes for the transport of fluidsGoogle Scholar
- 11.L.I. Houbu, Z.H.A.N.G. Xuemin, Q.I. Dongtao et al., Corrosion resistance of E6-glass fibre in simulated oilfield environments. J. Reinf. Plast. Compos. 32(8), 563–572 (2012)Google Scholar