Research on property and burning behavior of flammable casing for underground coal gasification
Xiangyi Ren,
Jianjun Wu,
Cankun Wang,
Junfeng Xie,
Jianjun Wang,
Mingtao Liu,
Lihong Han
Affiliations
Xiangyi Ren
State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an, Shaanxi 710077, China; Corresponding author.State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute. 89 Jinye 2nd Road, Xi'an, Shaanxi 710077, China.
Jianjun Wu
Department of Engineering Technology, Xinjiang Oilfield Company, Karamay, Xinjiang, 834000, China
Cankun Wang
Research Institute of Engineering and Technology, Petro China Coalbed Methane Company Limited, Xi'an, Shaanxi 710077, China
Junfeng Xie
Oil and Gas Engineering Research Institute of Tarim Oilfield Company, Bayingolin, Xinjiang, 841000, China
Jianjun Wang
State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an, Shaanxi 710077, China
Mingtao Liu
Drilling & Production Technology Research Institute of Liaohe Oilfield Company, Panjin, Liaoning 124010, China
Lihong Han
State Key Laboratory of Performance and Structural Safety for Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an, Shaanxi 710077, China; Corresponding author.
In this work, the comprehensive properties of flammable casing for underground coal gasification is systematically investigated, including flammable casing material physical, chemical and mechanical properties and full-size flammable casing mechanical properties and burning behavior. The flammable casing material consists of magnesium alloy matrix and rare earth particles, thermal conductivity and expansion property of which are weak. Results of high-temperature tensile test reveal that flammable casing material has good high temperature strength which declines by 30 % at 300 °C. Corrosion rate of flammable casing material is relatively high without extra protection. The full-size flammable casing possesses considerable mechanical property, thread property and high temperature collapse resistance. Burning of flammable casing is safe and stable. Burning rate of flammable casing material can be effectively controlled by water flow. Combustion product of flammable casing presents powder condition, which has no risk of blocking the gasification channel. To sum up, flammable casing is necessary to the realization of underground coal gasifying process, which plays the significant role of the development and application of underground coal gasification technology.
