基于井筒多相流理论的复杂结构井动态压井过程中的井筒压力研究

杨鹏飞; 毛良杰; 杨森; 陈雪峰

doi:10.21656/1000-0887.450061

基于井筒多相流理论的复杂结构井动态压井过程中的井筒压力研究

doi: 10.21656/1000-0887.450061

1.
西南石油大学石油与天然气工程学院, 成都 610500
2.
中石油西南油气田分公司开发事业部, 成都 610000
3.
中国石油集团工程技术研究院有限公司, 北京 102200

基金项目:

国家自然科学基金 52174006

四川省重点研发项目 S0497

四川省重点研发项目 2022YFG0119

详细信息

作者简介:
杨鹏飞(1999—)，男，硕士生(E-mail: 2653668723@qq.com)

通讯作者:
毛良杰(1987—)，男，教授，博士(通讯作者. E-mail: maoliangjie@qq.com)

中图分类号: TE28
计量
- 文章访问数: 73
- HTML全文浏览量: 26
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2024-03-06
- 修回日期: 2024-07-15
- 刊出日期: 2025-02-01

Research on Wellbore Pressure in the Dynamic Killing Process for Complex Structure Wells Based on the Wellbore Multiphase Flow Theory

1.
School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, P.R.China
2.
Development Department, Petro China Southwest Oil & Gasfield Company, Chengdu 610000, P.R.China
3.
CNPC Engineering Technology Research Company Limited, Beijing 102200, P.R.China

摘要

摘要: 基于井筒多相流理论，并结合井眼轨迹的计算方法，建立了复杂结构井动态压井数学模型，再采用有限差分法求解，对压井过程中井筒压力进行了模拟研究，认识了初始气侵量、压井液排量与密度、水平井段长度对井筒压力的影响. 研究结果表明：在大斜度井和水平井压井过程中，套管承受的压力将会变得更大，且套管承受高压的时间也会明显增长；初始气侵量越大，为平衡井筒压力，压井过程中套管压力和立管压力越大；压井排量越大，压井过程中的套管压力越低，立管压力越大；压井液密度越大，压井过程中套管压力和立管压力越低；水平段长度越长，压井过程中的套管压力越大，压井时间越长. 研究结果对保障复杂结构井的压井作业具有指导意义.
- 复杂结构井 /
- 动态压井 /
- 井眼轨迹 /
- 井筒压力
Abstract: Based on the wellbore multiphase flow theory and the calculation method for wellbore trajectories, a dynamic well killing mathematical model for complex well structures was established, and the finite difference method was used to solve it. The wellbore pressures during the well killing process were simulated and studied, and the influences of initial gas influxes, kill fluid displacements and densities, and horizontal well lengths on the wellbore pressures were studied. The research results show that, for high inclination and horizontal wells, the casing pressures will become larger and the casing time will increase significantly in the process of killing well. The larger the initial gas inflow is, the higher the casing pressures and riser pressures will be, to balance the wellbore pressures. The higher the killing capacity is, the lower the casing pressure and the higher the riser pressure will be. The higher the kill fluid density is, the lower the casing pressures and riser pressures will be. The longer the horizontal section length is, the greater the casing pressures and the longer the kill time will be. The work has guiding significance to ensure the well killing operation of complex structure wells.
- complex structure well /
- dynamic killing well /
- well trajectory /
- wellbore pressure

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图 1 压井过程的物理模型

Figure 1. The physical model for the kill process

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图 2 压井过程的控制体单元

Figure 2. The control unit of the kill process

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图 3 井筒离散网格节点和单元网格集成区域示意图

Figure 3. The diagram of the integrated area of discrete grid nodes and unit grids for the wellbore

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图 4 压井模拟求解流程

Figure 4. The kill well simulation solution flow chart

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图 5 直井、大斜度井和水平井井眼轨迹示意图

Figure 5. Borehole trajectories of vertical, highly inclined and horizontal wells

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图 6 直井、大斜度井和水平井的初始含气率分布图

Figure 6. Initial gas content distributions of vertical, highly inclined and horizontal wells

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图 7 压井过程中套管压力和井筒动态压力分布曲线

Figure 7. Casing pressure and wellbore dynamic pressure distribution curves during killing

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图 8 不同气侵体积下工程师法压井过程中的套管压力和立管压力

Figure 8. Casing pressures and riser pressures in the process of killing well with the engineer method for different gas cut volumes

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图 9 不同气侵体积下司钻法压井过程中的套管压力和立管压力

注为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.

Figure 9. Casing pressures and riser pressures in the process of killing well with driller's method for different gas cut volumes

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图 10 不同压井排量下工程师法压井过程中的套管压力和立管压力

Figure 10. Casing pressures and riser pressures in the process of killing well with the engineer method at different kill rates

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图 11 不同压井排量下司钻法压井过程中的套管压力和立管压力

Figure 11. Casing pressures and riser pressures in the process of killing well with driller's method at different kill rates

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图 12 不同压井液密度下工程师法压井过程中的套管压力和立管压力

Figure 12. Casing pressures and riser pressures in the process of killing with the engineer method at different kill fluid densities

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图 13 不同压井液密度下司钻法压井过程中的套管压力和立管压力

Figure 13. Casing pressures and riser pressures in the process of killing with driller's method at different kill fluid densities

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图 14 不同水平段长度下工程师法压井过程中的套管压力和立管压力

Figure 14. Casing pressures and riser pressures in the process of killing well with the engineer method at different horizontal section lengths

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图 15 不同水平段长度下司钻法压井过程中的套管压力和立管压力

Figure 15. Casing pressures and riser pressures in the process of killing well with driller's method at different horizontal section lengths

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图 16 初始含气率分布图

Figure 16. The initial gas content distribution

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图 17 模拟结果对比图

Figure 17. Comparison of simulation results

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表 1 基础参数

Table 1. Basic parameters

parameter	value	unit
the straight well depth	7 606	m
the depth of the highly inclined well	7 771	m
the vertical depth of the highly inclined well	7 606	m
the depth of the horizontal well	8 036	m
the vertical depth of the horizontal well	7 606	m
kick-off point	6 825	m
build-up rate	0.32	(°)/(30 m)
horizontal section	265	m
gas kick velocity	0.014	m³/s
drilling fluid density	1.7	g/cm³
drilling fluid displacement	25	L/s
well killing fluid density	1.766	g/cm³
kill fluid displacement	25	L/s
geothermal gradient	0.026	℃/m

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表 2 柴达木盆地某溢流井基础信息表

Table 2. Basic information of an overflow well in Qaidam Basin

parameter	value	unit
the straight well depth	4 933	m
gas velocity kick	0.008 3	m³/s
drilling fluid density	2.39	g/cm³
drilling fluid displacement	27	L/s
well killing fluid density	2.42	g/cm³
kill fluid displacement	30	L/s
geothermal gradient	0.026	℃/m

下载: 导出CSV

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