保温油管海洋采油井筒温度压力计算耦合模型

doi:10.7623/syxb201206020

石油学报 ›› 2012, Vol. 33 ›› Issue (6): 1064-1067.DOI: 10.7623/syxb201206020

保温油管海洋采油井筒温度压力计算耦合模型

宋洵成 1 　管志川 1 　韦龙贵 2　何　连 2 　郭永宾 2

1.中国石油大学石油工程学院山东青岛 266580; 2. 中海石油中国有限公司湛江分公司广东湛江 524057

收稿日期:2012-06-02 修回日期:2012-08-23 出版日期:2012-11-25 发布日期:2012-12-07
通讯作者: 宋洵成
作者简介:宋洵成，男，1972年12月生，2010年获中国石油大学(华东)博士学位，现为中国石油大学（华东）副教授，主要从事油气井流体力学与工程方面的研究。
基金资助:
教育部自主创新科研计划科技专项（11CX05014A）资助。

A coupled model of temperature-pressure calculation for offshore production wellbores with insulated tubing

SONG Xuncheng 1 　GUAN Zhichuan 1 　WEI Longgui 2　 HE Lian 2 　GUO Yongbin 2

Received:2012-06-02 Revised:2012-08-23 Online:2012-11-25 Published:2012-12-07

摘要/Abstract

摘要：

生产管柱上部采用真空隔热保温油管是海洋油井提高产液温度，防止油井结蜡的有效手段，科学设计保温油管的合理下深则需要准确预测海洋采油井筒温度剖面。将产液视作气液两相流，分别建立了质量守恒、动量守恒和能量守恒模型，模型中考虑了温度和压力对原油、天然气和地层水热物理性质的影响，井斜角对换热和压力降的影响，以及电潜泵机械能损失引起的热源。采用交错网格和全隐式有限体积法离散技术，建立了适合于海洋生产井筒温度场和压力场耦合求解的数值方法，保证了模型求解的稳定和收敛。利用所建立的模型对1口海洋油井进行了井筒温度分析和保温油管下深设计，结果表明，模型预测精度高（相对误差为0.46%），设计保温油管下深能有效地提高油流温度，避免油井结蜡。

关键词: 温度, 压力, 保温油管, 生产井, 海洋

Abstract:

Adoption of insulated tubing on the upper part of offshore production strings is an effective method to increase temperature of produced liquids and prevent wellbores from wax deposition. A scientific design for a proper depth of insulated tubing requires accurately predicting the temperature profile of offshore production wellbores. When produced liquids were regarded as a gas-liquid two-phase flow, equations for its mass conservation, momentum conservation and energy conservation could be, respectively, deduced. These equations integrate effects of temperature and pressure on thermophysical properties of oils, gases and formation waters as well as the effect of deviation angle on heat transfer and pressure drop with the internal heat resource caused by mechanical energy loss of an electric submersible pump. A numerical simulation method suitable for a coupling solution to temperature and pressure fields of offshore production wellbores was established using staggered grids and the fully-implicit finite-volume discrete technique, and this method offered a guarantee to make the solution of the model stable and convergent. The established model was applied to analyze temperatures of an offshore production wellbore and design the depth of its insulated tubing. The result shows that the prediction of the model is of high accuracy with a fractional error of 0.46%, and the designed depth of insulated tubing can effectively increase the temperature of oil fluids and prevent the wellbore from wax deposition.

Key words: temperature, pressure, insulated tubing, production well, offshore

宋洵成管志川韦龙贵何　连郭永宾. 保温油管海洋采油井筒温度压力计算耦合模型[J]. 石油学报, 2012, 33(6): 1064-1067.

SONG Xuncheng GUAN Zhichuan WEI Longgui HE Lian GUO Yongbin . A coupled model of temperature-pressure calculation for offshore production wellbores with insulated tubing[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(6): 1064-1067.

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保温油管海洋采油井筒温度压力计算耦合模型

A coupled model of temperature-pressure calculation for offshore production wellbores with insulated tubing

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