隔水管注气双梯度钻井井筒参数计算研究

毛良杰; 张孝诚; 薛继彪; 詹宁; 刘君

doi:10.21656/1000-0887.420065

隔水管注气双梯度钻井井筒参数计算研究

doi: 10.21656/1000-0887.420065

毛良杰^{1, 2, ,},
张孝诚²,
薛继彪³,
詹宁³,
刘君⁴

1.
西南石油大学油气藏地质及开发工程国家重点实验室，成都 610500
2.
西南石油大学石油与天然气工程学院，成都 610500
3.
中国石油集团西部钻探工程有限公司国际工程公司，乌鲁木齐 830000
4.
中国石油长庆油田第二采油厂，甘肃庆阳 745100

基金项目: 国家自然科学基金（52174006）；国家重点研发计划（2019YFC0312303）

详细信息

作者简介:
毛良杰（1987—），男，教授，博士，博士生导师（通讯作者. E-mail：maoliangjie@foxmail.com）

中图分类号: O29
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- 被引次数: 0
出版历程
- 收稿日期: 2021-03-09
- 修回日期: 2021-10-06
- 网络出版日期: 2022-03-10
- 刊出日期: 2022-04-01

Research on Calculation of Riser Gas Injection Dual-Gradient Drilling Wellbore Parameters

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, P.R.China
2.
Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, P.R.China
3.
International Engineering Company, CNPC Western Drilling Engineering Co. , Ltd. , Urumqi 830000, P.R.China
4.
No.2 Oil Production Plant of Petro China Changqing Oilfield, Qingyang, Gansu 745100, P.R.China

摘要

摘要:
基于隔水管注气双梯度钻井过程中隔水管环空多相流特性，建立了隔水管注气双梯度钻井环空多相流模型，采用有限差分法对模型进行求解，结合墨西哥湾某口深水井现场数据，分析了钻井参数对井底压力和环空压力的影响，并对注气流量的影响因素进行讨论。研究结果表明：隔水管注气双梯度钻井井底压力比常规钻井更低，更适用于海底窄密度窗口钻井；隔水管注气双梯度钻井在钻井过程中注气流量的大小对井底压力和环空压力影响较大；水深和钻井液密度是影响注气流量的两个重要因素。在隔水管注气双梯度钻井参数设计时，应选择合适的注气流量，且钻井液密度不宜过大，以确保隔水管注气双梯度钻井安全。该研究对隔水管注气双梯度钻井设计及现场作业具有指导意义。
- 深水 /
- 双梯度 /
- 多相流 /
- 注气 /
- 窄密度窗口
Abstract:
Based on the characteristics of multiphase flow in riser annulus during dual-gradient drilling with riser gas injection, a multi-phase flow model for the riser gas injection dual-gradient drilling wellbore was established. The model was solved with the finite difference method and combined with the actual parameters of a deep water well in the Gulf of Mexico. The influences of drilling parameters on the bottom hole pressure and the annulus pressure, and the influence factors on the gas injection flow rate were discussed. The research results show that, the bottom hole pressure of dual-gradient riser gas injection drilling is lower than that of conventional drilling, and is more suitable for subsea narrow-density window drilling; the magnitude of the gas injection flow rate during the dual-gradient riser gas injection drilling process has great effects on the bottom hole pressure and the annulus pressure, and the water depth as well as the drilling fluid density are 2 important factors influencing the gas injection flow. In the design of the dual-gradient drilling parameters for riser gas injection, the appropriate gas injection flow rate should be selected and the drilling fluid density should not be too large to ensure the safety of dual-gradient riser gas injection drilling. The research has guiding significance for the design of dual-gradient drilling with riser gas injection and field operations.
- deep water /
- dual-gradient /
- multiphase flow /
- gas injection /
- narrow density window

HTML全文

图 1 隔水管注气双梯度钻井物理模型

Figure 1. The physical model for dual-gradient drilling with riser gas injection

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图 2 气相质量守恒的物理模型

Figure 2. The physical model for mass conservation of the gas phase

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图 3 网格划分及离散单元区域示意图

Figure 3. Schematic diagram of grid division and a discrete unit area

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图 4 求解流程图

Figure 4. The solution flow chart

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图 5 模拟结果对比图

Figure 5. Comparison of simulation results with measured results

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图 6 隔水管注气双梯度钻井注气过程中压力及温度变化：(a) 注气双梯度钻井和常规钻井环空压力分布；(b) 注气双梯度钻井井底压力；(c) 环空压力云图；(d) 井筒温度场变化规律

Figure 6. During the gas injection process of dual-gradient drilling with riser gas injection: (a) the annulus pressure distributions in dual-gradient drilling and conventional drilling; (b) the bottom hole pressure in dual-gradient drilling with gas injection; (c) the annulus pressure contour ; (d) variation laws of the wellbore temperature field

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图 7 不同注气流量下压力、含气率及速度的变化：(a)环空压力；(b) 井底压力；(c) 泥线处含气率；(d) 气液速度

Figure 7. At different gas injection flow rates: (a) the annulus pressure; (b) the bottom hole pressure; (c) the gas content at the mudline; (d) the gas-liquid velocity variation

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8 不同钻井液排量下压力、含气率及速度的变化：(a) 环空压力；(b) 井底压力；(c) 泥线处含气率；(d) 气液速度

8. Under different drilling displacements: (a) the annulus pressure; (b) the bottom hole pressure; (c) the gas content at the mudline; (d) the gas-liquid velocity variation

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图 9 不同钻井液密度下压力、含气率及速度的变化：(a) 环空压力；(b) 井底压力；(c) 泥线处含气率; (d) 气液速度

Figure 9. Under different drilling fluid densities: (a) the annulus pressure; (b) the bottom hole pressure; (c) the gas content at the mudline; (d) the gas-liquid velocity variation

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图 10 水深、钻井液密度、钻井液排量对注气量的影响：(a) 水深；(b) 钻井液密度; (c) 钻井液排量

Figure 10. The effects on gas injection: (a) the water depth; (b) the drilling fluid density; (c) the drilling fluid displacement

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表 1 墨西哥湾某口深水井基础数据

Table 1. Basic data of a deep water well in the Gulf of Mexico

parameter	value	unit
well depth	7132	m
water depth	1828	m
riser ID	488	mm
choke line ID	114	mm
casing OD	298.45	mm
casing ID	273	mm
drilling fluid density	1.12	g/cm³
drilling fluid displacement	34	L/s
formation pressure	119.4	MPa
nitrogen injection rate	22	m³/min
gas injection pipeline ID	31.75	mm
drill pipe OD	88.9	mm
geothermal gradient	0.03	℃/m
plastic viscosity	28	mPa·s

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表 2 墨西哥湾某口深水井相关计算参数

Table 2. Related calculation parameters of a deep-water well in the Gulf of Mexico

parameter	value	unit
water depth	1980	m
well depth	3498	m
drilling fluid density	1.2	g/cm³
drilling fluid viscosity	31	mPa·s
riser ID	488	mm
choke line ID	114	mm
casing OD	298.45	mm
casing ID	273	mm
drilling fluid displacement	34	L/s
gas injection flow	15	m³/min
sea water density	1.02	g/cm³
drill pipe OD	127	mm
gas injection pipeline ID	31.75	mm
geothermal gradient	0.03	℃/m
gas injection pipeline diameter	88.9	mm

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