Theoretical and experimental study of the thermal strength of anticorrosive lined steel pipes  

作　　者：Zeng Dezhi Deng Kuanhai Lin Yuanhua Shi Taihe Shi Daiyan Zhou Lizhi 

机构地区：[1]State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) [2]CNPC Key Laboratory for Tubular Goods Engineering, Southwest Petroleum University [3]Southwest Branch of Engineering Design Co. Ltd., CNPC [4]Rsearch Institute of Exploration and Development, Tarim Oilfield Company, PetroChina

出　　处：《Petroleum Science》2014年第3期417-423,共7页石油科学（英文版）

基　　金：financial support from the National Natural Science Foundation of China (Nos. 51004084, 51274170);the Doctoral Fund of Ministry of Education of China (No. 20105121120002)

摘　　要：Bimetallic lined steel pipe （LSP） is a new anti-corrosion technology. It is widely used to transport oil, gas, water and corrosive liquid chemicals. At present, the hydroforming pressure for LSP has been investigated theoretically and experimentally by most researchers. However, there are a few reports on the thermal strength of bimetallic LSP. Actually, the bimetallic LSP will be subjected to remarkable thermal load in the process of three layer polyethylene （3PE） external coating. Reverse yielding failure may occur on the inner pipe of the bimetallic LSP when it suffers from remarkable thermal load and residual contact pressure simultaneously. The aim of this paper is to study the thermal load and strength of the bimetallic LSP. A mechanical model, which can estimate the thermal strength of the bimetallic LSP, was established based on the elastic theory and the manufacture of the bimetallic LSP. Based on the model, the correlation between the thermal strength of the bimetallic LSP and residual contact pressure and wall thickness of the inner pipe was obtained. Reverse yielding experiments were performed on the LSP （NT80SS-316L） under different thermal loads. Experiment results are consistent with calculated results from the theoretical model. The experimental and simulation results may provide powerful guidance for the bimetallic LSP production and use.Bimetallic lined steel pipe （LSP） is a new anti-corrosion technology. It is widely used to transport oil, gas, water and corrosive liquid chemicals. At present, the hydroforming pressure for LSP has been investigated theoretically and experimentally by most researchers. However, there are a few reports on the thermal strength of bimetallic LSP. Actually, the bimetallic LSP will be subjected to remarkable thermal load in the process of three layer polyethylene （3PE） external coating. Reverse yielding failure may occur on the inner pipe of the bimetallic LSP when it suffers from remarkable thermal load and residual contact pressure simultaneously. The aim of this paper is to study the thermal load and strength of the bimetallic LSP. A mechanical model, which can estimate the thermal strength of the bimetallic LSP, was established based on the elastic theory and the manufacture of the bimetallic LSP. Based on the model, the correlation between the thermal strength of the bimetallic LSP and residual contact pressure and wall thickness of the inner pipe was obtained. Reverse yielding experiments were performed on the LSP （NT80SS-316L） under different thermal loads. Experiment results are consistent with calculated results from the theoretical model. The experimental and simulation results may provide powerful guidance for the bimetallic LSP production and use.

关 键 词：Thermal strength reverse yielding mechanical model lined steel pipe residual contact pressure 

分 类 号：TE988.2[石油与天然气工程—石油机械设备]