Design and Application of On-line Detecting Device for Corrosion in Oil & Gas Field
ZHU Peike1, DENG Jingen1, HUANG Kaiwen2, LUO Yuwei3, ZHU Jianglin3, WU Shan1
1. State Key Laboratory of Petroleum Resource & Prospecting, China University of Petroleum, Beijing 102249, China;
2. CNOOC (China) Co., Ltd., Zhanjiang Branch, Zhanjiang 524000, China;
3. China Oilfield Services Limited, Langfang 065200, China
Abstract：In optimizing the selection of corrosion-resistant materials and safe and economic casing and tubing materials for oil & gas fields with high content of CO2 and H2S, the oilfield coupon corrosion test plays an important role. The weakness of the current detecting devices of corrosion is shown and the structural features that a detecting device of corrosion should have for the assessment of the steel corrosion under oilfield conditions are analyzed. Based on these analyses, an on-line detecting device of corrosion is designed and manufactured. During the design phase, the strength of the on-line detecting device of corrosion is checked and a PTFE (polytetrafluoroethylene) holder and the coupons with the trapezoidal cross sectional shape are specially designed. After the device is manufactured, the pressure test is carried out to check the device for the maximum working pressure and the specific operation method. The corrosion detecting devices are installed in wells of the Missan oilfield. The device is in the wellhead and before the injection point of the corrosion inhibitor and can meet the requirement of the oilfield. The oilfield test covers the scheduled amount for different materials of coupons during 3 months. The results show that 13Cr martensitic stainless steel can work under the condition of 0.2 MPa CO2 and under the condition of 1.3 MPa CO2, 0.8 MPa H2S, the 13Cr super-martensitic stainless steel shows no local corrosion with a very low corrosion rate.
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