| 摘要: |
| 基于油井关井期间换热机制,对井筒内区域、界面区(井筒与地层/海水的交界面)和地层分别建立温度控制方程。根据下入保温油管的生产管柱结构和井筒换热物理模型几何特征,应用交替方向全隐式离散技术,对井筒内轴线节点、油管底部节点、内节点和井筒/海水界面等单独离散,建立稳定、收敛的瞬态温度场数值求解方法。结果表明,关井后初始阶段产液温度下降速率大,随关井时间延长,产液温度下降速率逐渐降低,关井24h后受井筒内产液影响的径向区域半径小于3m,关井106.1h后井筒及周围地层温度恢复到原始温度。南海实例井模拟结果与实测数据相对误差小于3％。 |
| 关键词: 钻井 海洋 瞬态温度场 关井 保温油管 |
| DOI：10.3969/j.issn.1673-5005.2013.04.014 |
| 分类号::TE 142 |
| 基金项目:中央高校基本科研业务费专项(11CX05014A) |
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| Transient temperature field model of shut-in offshore wells |
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SONG Xun-cheng1, WEI Long-gui2, HE Lian2, GUO Yong-bin2
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(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.Zhanjiang Branch Company, China National Ocean Oil Corporation, Zhanjiang 524057, China)
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| Abstract: |
| Based on transient heat transfer mechanism involved in shut-in offshore oil wells, the temperature governing equations for areas including inside the wellbore, interface between the wellbore and sea water or formation, and formation were developed. According to production tubing structure and the geometry characteristics of wellbore heat transfer physical model, discrete equations for nodes at wellbore axis, oil tubing bottom, inner area and interface between wellbore and sea water were established respectively using implicit finite volume patterns and the alternate-direction method. A stable and convergent numerical simulation method was proposed to solve transient temperature field. The results show that the wellbore temperature decreases rapidly at the initial stage, and then it decreases slowly with shut-in periods extending. In addition, the affected radius is less than 3m after shut-in 24h, and the wholesome temperature field is recovered to the origin one after shut-in about 106.1h. The relative error between simulated results and test data of a cased well in South China Sea is less than 3％. |
| Key words: drilling offshore transient temperature field shut-in insulated oil tubing |
