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考虑温度压力耦合效应的控压固井全过程水力参数计算方法
王雪瑞1,孙宝江2,王志远2,马金山3,齐金涛3,郗凤亮3,赵殊勋4,郝锋2
(1.中国石油大学(华东)青岛软件学院,山东青岛 266580;2.中国石油大学(华东)石油工程学院,山东青岛 266580;3.中国石油集团渤海钻探工程有限公司钻井技术服务分公司,天津 300280;4.中国石油集团渤海钻探工程有限公司第二固井公司,天津 300280)
摘要:
综合考虑固井井筒流体瞬态流动特征、温压流变性以及水泥浆水化反应,建立考虑温度压力耦合效应的固井全过程水力参数计算方法。利用新模型开展数值模拟与场地试验,揭示控压固井全过程瞬态温度压力演化规律。结果表明:新模型能精确预测固井全过程温度、压力,很好地满足工程需求;受循环变密度、变排量等影响,固井循环过程井筒压力呈现出明显的非稳态特征;固井循环阶段各流体流变性受温度压力影响明显,温压流变性的影响对精确预测固井井筒压力不可忽略;固井侯凝期间,受水泥浆水化反应的影响,水泥浆压力逐渐降低,温度呈现先增加后降低的趋势,该阶段需要在井口施加一定回压来避免固井气窜的发生;控压固井技术能够有效避免窄安全密度窗口地层井漏、气窜等事故的发生,构建的固井全过程水力参数计算模型可为成功实施控压固井技术提供理论支持。
关键词:  精细控压  全过程  固井  温度压力耦合  气窜
DOI:10.3969/j.issn.1673-5005.2022.02.010
分类号::TE 122.14
文献标识码:A
基金项目:国家自然科学基金青年基金项目(52004315);山东省自然科学基金青年基金项目(ZR2020QE113);中国博士后科学基金项目(2021T140738);国家自然科学基金项目(U1762216)
Calculation method of hydraulic parameters in whole cementing process considering coupling effect of temperature and pressure
WANG Xuerui1, SUN Baojiang2, WANG Zhiyuan2, MA Jinshan3, QI Jintao3, XI Fengliang3, ZHAO Shuxun4, HAO Feng2
(1.Qingdao Institute of Software in China University of Petroleum(East China), Qingdao 266580, China;2.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;3.Drilling Technology Service Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280, China;4.No.2 Cementing Company, CNPC Bohai Drilling Engineering Company Limited, Tianjin 300280, China)
Abstract:
A calculation method for hydraulic parameters in the whole cementing process considering the coupling effect of temperature and pressure was established, in which the transient flow characteristics during cementing circulation stage, the rheology of cementing fluid, and the interaction among hydration reaction, temperature and pressure during cement setting stage were considered. The new model can be used to predict the temperature and pressure during the whole cementing process. The numerical simulation and field experiments were carried out using the new model to reveal the transient temperature and pressure during the whole cementing process with managed pressure. The results show that, during the cementing cycle stage with a variety of fluids, the wellbore pressure appears with obvious unsteady characteristics as a result of the variable fluid density and displacement. The rheological properties of the cement slurry during its circulation stage are obviously affected by temperature and pressure, which cannot be ignored. During the cementing setting stage, the pressure of cement slurry gradually decreases due to the influence of hydration reaction of cement materials, and the temperature increases first and then decreases. Therefore, it suggests that certain back pressure can be applied at wellhead to avoid gas channeling during cementing setting. The field experiments indicate that the managed pressure cementing technique can effectively avoid fluid loss, gas channeling and other incidents in the formation with a narrow safety density window. The new model established can provide theoretical support for the successful implementation of the managed pressure cementing technique.
Key words:  managed pressure  whole process  cementing  temperature and pressure coupling  gas channeling
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