深水油气井开采过程环空压力预测与分析

doi:10.7623/syxb201508013

石油学报 ›› 2015, Vol. 36 ›› Issue (8): 1012-1017.DOI: 10.7623/syxb201508013

深水油气井开采过程环空压力预测与分析

张波, 管志川, 张琦

中国石油大学石油工程学院山东青岛 266580

出版日期:2015-08-25 发布日期:2015-08-06
通讯作者: 管志川,男,1959年3月生,1982年获华东石油学院学士学位,1995年获石油大学(北京)工学博士学位,现为中国石油大学(华东)教授、博士生导师,主要从事油气井力学、井下测控技术、深井超深井钻井和深水钻井等方面的研究工作。Email:guanzhch@upc.edu.cn
作者简介:张波,男,1990年10月生,2013年获中国石油大学(华东)石油工程专业学士学位,现为中国石油大学(华东)博士研究生,主要从事油气井流体力学和深水油气井领域相关研究工作。Email:zhangboupc@126.com
基金资助:
教育部长江学者创新团队发展计划"海洋油气井钻完井理论与工程"项目(IRT1086) 资助。

Prediction and analysis on annular pressure of deepwater well in the production stage

Zhang Bo, Guan Zhichuan, Zhang Qi

College of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China

Online:2015-08-25 Published:2015-08-06

摘要/Abstract

摘要：

深水油气井投入生产后受到地层高温流体的影响,井筒内温度场会重新分布引起环空压力上升,威胁油气井管柱的安全服役和井筒完整性。为确保深水油气井井身结构和管柱强度符合长期安全稳产的要求,建立了基于能量守恒定律和多层圆筒壁传热原理的深水油气井井筒温度分布计算模型,根据深水油气井井身结构复杂、环空层次多的特点,遵照体积相容性原则提出了计算环空压力的迭代方法,实现了对井筒内温度分布和环空压力的预测与分析。利用温度预测模型和压力计算方法对相关影响因素进行了分析。结果表明:环空温度、压力的上升主要集中在油气井投入生产的初期,随生产时间的增加变化逐渐变缓;产量较低时,井口产出流体的温度与环空温度、压力随产量的上升迅速增加,当产量到达一定数值以后井口产出流体的温度与环空温度、压力趋于稳定;环空温度和压力随着地温梯度的增加线性上升。

关键词: 深水油气井, 密闭环空, 温度分布, 环空压力, 影响因素, 规律分析

Abstract:

Deepwater oil and gas wells are under the influence of high-temperature formation fluid after put into production, so that the shaft temperature field is redistributed to cause a rise in annular pressure, threatening the safety service of well string and shaft integrity. The calculation model of shaft temperature distribution in deepwater wells was established on a basis of energy conservation law and multi-cylinder heat transfer discipline, thus assuring the well structure and string strength of deepwater wells can satisfy the demands for long-term safety production. According to the characteristics of deepwater wells such as complex well structure and multiple annular hierarchies in line with the principle of volume compatibility, the iterative method was proposed to calculate annular pressure, so as to predict and analyze the shaft temperature distribution and annular pressure. Relevant influence factors were analyzed using the temperature distribution model and pressure calculation method. The results have indicated that annular temperature and pressure mainly ascend in the initial production stage of oil and gas wells, and the changes become gentle over production time; in case of lower output, the wellhead fluid temperature, annular temperature and pressure will rise rapidly as output increase, but tends to be stable when the output reaches a certain value; annular temperature and pressure presents a liner rise with the increase of geothermal gradient.

Key words: deepwater well, trapped annulus, temperature distribution, annular pressure, influence factors, law analysis

中图分类号:

TE33+1.1

张波, 管志川, 张琦. 深水油气井开采过程环空压力预测与分析[J]. 石油学报, 2015, 36(8): 1012-1017.

Zhang Bo, Guan Zhichuan, Zhang Qi. Prediction and analysis on annular pressure of deepwater well in the production stage[J]. Acta Petrolei Sinica, 2015, 36(8): 1012-1017.

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深水油气井开采过程环空压力预测与分析

Prediction and analysis on annular pressure of deepwater well in the production stage

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