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Liu Q.Y.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation SWPU | Mao L.J.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation SWPU | Zhou S.W.,China National Offshore Oil Corporation
Corrosion Science | Year: 2014

Effects of chloride content on CO2 corrosion of carbon steel have been studied by immersion tests and electrochemical measurements combined with scanning electron microscopy, X-ray diffraction and analysis of polarization curves. Results show that maximum CO2 corrosion rate is reached with increasing Cl- content at a constant temperature and partial pressure. CO2 corrosion is a mixed-controlled process, i.e., both activation and mass-transfer steps with increasing Cl- content. Increasing Cl- content can reduce CO2 solubility. Moreover, Cl- can destroy corrosion product films and change morphology of corrosion product films, but it has no effect on the composition of the corrosion product. © 2014 Elsevier Ltd. Source


Jie S.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation SWPU | Yong Z.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation SWPU | Le X.W.,China National Petroleum Corporation
Proceedings - 4th International Conference on Computational and Information Sciences, ICCIS 2012 | Year: 2012

Many gas reservoirs with high H 2S content have been found in China, such as Luojiazhai Gas Field and Puguang Gas Field, and they play an important role in China's natural gas industry. However, there are a series of serious problems in production of these gas reservoirs, such as H 2S poison, strong corrosion, and sulfur deposition. Therefore, it is important to gas flowing theory study on gas reservoirs with high H 2S content. This paper discusses sour gas flow and sulfur deposition. Based on the experimental work and aerodynamics gas-solid flow theory, three-dimensional multi-component mathematical model for sour gas reservoir is developed. In the model, factors of affecting sulfur particle deposition has been studied, including gas flow rate, initial H 2S concentration and formation permeability. © 2012 IEEE. Source


Lin Y.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation SWPU | Sun Y.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation SWPU | Sun Y.,Drilling and Production Technology Research Institute | Shi T.,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation SWPU | And 5 more authors.
Journal of Pressure Vessel Technology, Transactions of the ASME | Year: 2013

As wells are drilled deeper, the external pressures applied to well casing become greater. Conventional America Petroleum Institute (API) casing strength cannot meet the strength criteria of high pressure, high temperature, and high H2S (HPHTHS) gas wells which are called "3-high" gas wells. When high collapse casing (HCC) is applied in oil fields, it has obviously improved collapse properties in excess of API ratings. HCC shows a very high resistance to tension load, internal pressure, and collapse, as well as being highly resistant to sulfide stress corrosion cracking (SSCC), and it also can be used for deep and sour gas and oil fields. For imperfections of the API 5C3 collapse formula, the joint API/ISO work group ISOTC67 SC5 WG2b have proposed the current API Bulletin 5C3, and a new collapse strength model with manufacturing imperfections, such as ovality, eccentricity, residual stress, etc., improves the casing strength calculation accuracy and increases the benefits for casing strength design, rather than just using API Bulletin 5C3. The study on the new ISO collapse model has found that it is inappropriate to predict the collapse strength of the high collapse casing. As a result, on the basis of my work group results, a new high collapse model for predicting the collapse strength of all HCC has been presented. Numerical and experimental comparisons show that the "new high collapse model" predicts higher accuracy than that of ISO, and this will make great improvements in the casing design of deep and ultradeep wells on the basis of HCC material safety, which was guaranteed. Copyright © 2013 by ASME. Source

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