Impact of Various Tubing Material Performance Under High CO2 Environment on Future Marginal Field Development Strategy

Syarifah Puteh Mariah Syed Abd Rahim, M. F. Azman, Zaidi Awang@Mohamed, Mior Yusni Ahmad Fuad
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Abstract

It is widely known that for highly corrosive environment, corrosion-resistance alloy (CRA) is recommended as the production tubing material. This is because its alternative, carbon steel (CS) is prone to corrosion that leads to integrity issues such as tubing leak and tubing parted. However, CRA usage would increase well cost resulting in unattractive commercial implication especially for a marginal field development which tends to be very sensitive economically. This paper gathers the actual performance of various tubing materials that have been installed in a high CO2 oil field in Peninsular Malaysia, in which the findings would be used to determine a proper tubing material selection strategy for future development. Actual data from 30 years of production was collected and to be analyzed statistically. Each well's water cut trend was evaluated to establish relationship between producing water to the corrosion rate and metal loss in the presence of CO2. It is noted that some wells completed with CS both in single and dual completion are still producing with no leaks after 30 years. This case applies to either single string or dual string, with both strings are completed as producer. However, majority of active CS-completed wells require tubing pack off to overcome multiple leaks, especially in dual utility wells. Notably, wells that are completed with CRA e.g., 13 Cr are active with no possible leaks at all. Some wells which are completed with glass-reinforced epoxy (GRE) and higher grade of CRA; 22 & 25 Cr, also do not show any potential leaks or tubing integrity issue. It is proven and highly recommended to complete high CO2 fields with CRA material. Nevertheless, by understanding the well and reservoir performance, particularly on the effect of water cut in relation to general corrosion due to CO2, the use of more expensive materials can be optimized. This paper is to discuss, in the context of marginal field development where production life is relatively shorter and production rate is low, the consideration of deploying a cheaper material and/or less corrosion-resistant substances as the tubing material to make the development more commercially attractive or remain status quo with CRA.
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高CO2环境下不同管材性能对未来边际油田开发策略的影响
众所周知,对于高腐蚀性环境,推荐使用耐腐蚀合金(CRA)作为生产油管材料。这是因为其替代品碳钢(CS)容易腐蚀,从而导致油管泄漏和油管分离等完整性问题。然而,使用CRA会增加油井成本,导致商业意义不吸引人,特别是对于经济上非常敏感的边际油田开发。本文收集了在马来西亚半岛某高二氧化碳油田安装的各种油管材料的实际性能,研究结果将用于确定未来开发中合适的油管材料选择策略。收集了30年生产的实际数据,并进行了统计分析。对每口井的含水率趋势进行了评估,以建立CO2存在下产出水与腐蚀速率和金属损失量之间的关系。值得注意的是,一些使用CS完成的单井和双井在30年后仍在生产,没有泄漏。这种情况适用于单字符串或双字符串,两个字符串都作为生产者完成。然而,大多数活性cs完井都需要封隔油管来克服多重泄漏,特别是在双井中。值得注意的是,使用CRA(例如13cr)完井的井是活跃的,根本没有可能发生泄漏。用玻璃增强环氧树脂(GRE)和更高等级的CRA完井;22和25 Cr,也没有显示任何潜在的泄漏或油管完整性问题。经过验证,强烈建议使用CRA材料完成高CO2油田。然而,通过了解井和油藏的性能,特别是与二氧化碳腐蚀相关的含水率影响,可以优化使用更昂贵的材料。在边际油田开发的背景下,生产寿命相对较短,产量较低,为了使开发更具商业吸引力或保持CRA现状,考虑采用更便宜的材料和/或耐腐蚀物质作为油管材料。
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