刘阳,王啸,许杰,范白涛,赵少伟,黄焕阁.渤海凝析油气藏探井转开发井防腐技术研究[J].表面技术,2018,47(10):249-255.
LIU Yang,WANG Xiao,XU Jie,FAN Bai-tao,ZHAO Shao-wei,HUANG Huan-ge.Anti-corrosion Techniques for Transition from Exploration Well to Development Well in Condensate Reservoirs in Bohai Sea[J].Surface Technology,2018,47(10):249-255 |
| 渤海凝析油气藏探井转开发井防腐技术研究 |
| Anti-corrosion Techniques for Transition from Exploration Well to Development Well in Condensate Reservoirs in Bohai Sea |
| 投稿时间：2018-06-05 修订日期：2018-10-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2018.10.033 |
| 中文关键词: 海上油田 油套管 CO2腐蚀 H2S腐蚀 探井转开发井 材质优选 |
| 英文关键词:offshore oilfield tube and casing CO2 corrosion H2S corrosion transition from exploration well to development well materials optimization |
| 基金项目: |
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| Author | Institution |
| LIU Yang | Tianjin Branch, CNOOC (China) Co., Ltd, Tianjin 300452, China |
| WANG Xiao | Tianjin Branch, CNOOC (China) Co., Ltd, Tianjin 300452, China |
| XU Jie | Tianjin Branch, CNOOC (China) Co., Ltd, Tianjin 300452, China |
| FAN Bai-tao | Tianjin Branch, CNOOC (China) Co., Ltd, Tianjin 300452, China |
| ZHAO Shao-wei | Tianjin Branch, CNOOC (China) Co., Ltd, Tianjin 300452, China |
| HUANG Huan-ge | Tianjin Branch, CNOOC (China) Co., Ltd, Tianjin 300452, China |
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| 中文摘要: |
| 目的 探究海上凝析油气藏CO2和H2S共存情况下，深探井转开发井回接生产时套管的腐蚀行为，控制井筒腐蚀风险，指导海上油气田可转开发井的深探井防腐设计和油套管材质优选。方法 基于现场所取储层流体样品的组分分析，确定储层井流物的组分以及其物化性质，然后针对可能选用的不同防腐等级的套管材质试片，采用室内高温高压腐蚀评价釜来进行腐蚀试验，最后根据腐蚀速率以及腐蚀形貌微观形态（SEM）结果，优选海上油气田探井转开发井生产套管的防腐材质。结果 同构造邻井中油气样CO2和H2S共存，所含CO2的物质的量分数为6.57%，H2S质量浓度为46.31 mg/m3，并且储层温度高达171.9 ℃，储层测试时虽不含水，但是探井转生产井后期不排除出水可能，出水后油套管腐蚀风险高。现场工况下，共进行了3Cr不锈钢、13Cr不锈钢及超级13Cr不锈钢材质的腐蚀评价试验，三种套管材质腐蚀速率分别为2.8844、0.0749、0.0182 mm/a。结论 常规3Cr不锈钢套管材质的腐蚀速率超过腐蚀控制线，综合考虑油气井后期开发出水等风险，推荐使用13Cr以上的防腐材质，能够有效降低探井转开发井后期回接生产时的生产套管腐蚀风险，目前已应用于渤海油气田4口探井转开发井的7寸尾管选材中，取得了良好的防腐效果。 |
| 英文摘要: |
| After the process of turning exploration well into production well, CO2 and H2S in reservoir may lead to corrosion and perforation of production casing and seriously affect safety. The work aims to explore the corrosion behavior of casing in the post-production process of deep exploration wells under the co-existence of CO2 and H2S in offshore condensate oil and gas reservoirs, control the corrosion risk of wellbore, and guide anti-corrosion design of deep exploration wells and material selection of oil casing in offshore oil field transferable development wells. The samples taken from the field reservoir were analyzed for components to determine the composition and physical and chemical properties of the reservoir fluid. Then, the indoor dynamic high temperature and high pressure corrosion evaluation kettle was used to test the corrosion of the casing materials with different corrosion prevention grades. Based on eruption velocity and micromorphology of corrosion (SEM), the best anti-corrosion material was selected for the production casing used in the process of turning exploration well into production well. The co-existence of CO2 and H2S was confirmed in the oil and gas samples taken from syntectonic adjacent wells. CO2 concentration was 6.57mol%, H2S concentration was 46.31 mg/m3, and reservoir temperature was 171.9 ℃. The reservoir test was free from water, but in later stage of transition from exploration well to development well, there still might be water. Casing out of water could be possibly corroded. 3 groups of corrosion tests were carried out by 3Cr stainless steel, 13Cr stainless steel and super 13Cr stainless steel at field conditions and the corrosion rate of these three types of cannulas was respectively 2.8844 mm/a, 0.0749 mm/a and 0.0182 mm/a. The corrosion rate of the conventional 3Cr stainless steel exceeds the corrosion control line. In consideration of the water leakage risk at the later development of the oil and gas wells, anticorrosion material above 13Cr was recommended. The above materials can effectively reduce the corrosion risk of the production of the casing in the later recovery production of the exploration well and has been applied to 7 inch tail pipe in the transferring of 4 exploration wells to development wells in Bohai oil and gas field with good effect of anticorrosion. |
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