Plastic limit analysis of defective casing for thermal recovery wells |
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| Affiliation: | 1. State Key Laboratory of Oil and Gas Resources and Detection, China University of Petroleum, Beijing 102249, China;2. Drilling Research Institute, CNPC, 102206, China;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Hubei Key Laboratory of Geo-Environmental Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;4. PipeChina West East Gas Pipeline Company, Shanghai 200120, China;5. Mackay School of Earth Sciences and Engineering, University of Nevada, Reno 89557, Nevada, USA;1. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101, China;2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China;2. Department of Civil Engineering, Monash University, Clayton, Victoria 3800, Australia |
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| Abstract: | The service life of the casing is one of the technical problems affecting heavy oil recovery efficiency. Plastic limit analysis of the defective casing can effectively prevent casing failure and improve the comprehensive service life in high temperature and pressure thermal recovery wells. In this paper, the analysis of such influencing parameters as defect shape, defect depth, defect circumferential spread, defect number and defect distribution are conducted respectively and it is proven that defect depth and circumferential spread are the main controlling factor to the plastic limit load of defective casing. Furthermore, plastic limit load mathematical model of defective casing caused by the combination of high temperature and high steam injection pressure is presented through the classical formula of plastic limit load for ideal circular tube. The model is then amended by the numerical calculation results and proven to be in good agreement with the data gained from the defective casing blasting failure experiment. Hence, the presented mathematical model can accurately predict the plastic limit load of defective casing in thermal recovery wells. |
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