深水油气井套管环空压力预测模型  

Prediction model of casing annulus pressure for deepwater well drilling and completion operation

作　　者：杨进[1] 唐海雄 刘正礼 杨立平[3] 黄小龙[3] 严德[3] 田瑞瑞[3] 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室 [2]中海石油(中国)有限公司深圳分公司 [3]中海油能源发展股份有限公司监督监理技术分公司

出　　处：《石油勘探与开发》2013年第5期616-619,共4页Petroleum Exploration and Development

基　　金：国家科技重大专项"深水钻完井及其救援井应用技术研究"(2011ZX05026-001-04-20120523);国家科技重大专项"海上稠油热采井口升高控制技术研究"(2011ZX05024-005-007)

摘　　要：针对深水油气井测试过程和生产初期井口处套管环空压力上升可能造成套管挤毁或破裂的问题,基于典型深水井井身结构和井筒传热过程,建立套管环空压力预测模型,为控制套管环空压力提供依据。以测试管柱与生产套管间环空为例,根据能量守恒原理和井筒传热过程分析,推导了套管环空温度计算公式。分析了套管环空体积随温度和压力的变化,并结合套管环空温度计算公式及PVT状态方程,建立了典型深水井套管环空压力预测模型。利用推导的套管环空温度计算公式及套管环空压力预测模型预测了西非海域某油田7口深水井的套管环空温度和压力,并与现场实际监测值进行了对比,结果表明:套管环空温度、压力的监测值与预测值的相对误差均在10%以内,模型准确性较高。Casing collapse and fracture may be caused by the rise of casing annulus temperature and pressure in the initial stage of production and testing of deepwater wells. Based on the casing program and wellbore heat transfer process, a pressure calculation model for casing annulus was established, which provides basis for annulus pressure control. With the annulus between testing string and production casing as an example, a casing annulus temperature calculation method was derived according to the principle of conservation of energy and wellbore heat transfer analysis. The casing annulus pressure prediction model was established for typical deepwater wells according to the volume change of casing annulus fluid with temperature and pressure, and in combination of the casing annulus PVT equation and annulus temperature equation. The casing annulus temperature and pressure calculation methods were successfully applied in the casing annulus temperature and pressure management operation in 7 deepwater wells in West Africa, and the predicted temperature and pressure were compared with the actual ones, which indicates that casing annulus temperature and pressure prediction methods have good accuracy, with the relative error below 10%.

关 键 词：深水 油气井 套管 环空压力 预测模型 

分 类 号：TE21[石油与天然气工程—油气井工程]