基于水动力不稳定性的油水乳化储层伤害数值模拟

易飞; 徐建平; 蒋官澄; 王巧智; 苏延辉; 高波

doi:10.3969/j.issn.1001-5620.2017.06.023

基于水动力不稳定性的油水乳化储层伤害数值模拟

doi: 10.3969/j.issn.1001-5620.2017.06.023

易飞¹,
徐建平²,
蒋官澄^2,3, ,,
王巧智¹,
苏延辉¹,
高波¹

1. 中海油能源发展股份有限公司工程技术分公司, 天津 300450;
2. 中国石油大学(北京) 石油工程学院, 北京 102249;
3. 中国石油大学(北京)·油气资源与探测国家重点实验室, 北京 102249

基金项目:

国家“十三五”重大专项“复杂结构井、丛式井设计与控制新技术”（2017ZX05009-003）、“页岩气水平井用水基钻井液”（2016ZX05022-001-001-001）、“深井超深井优质钻井液与固井完井技术研究”（2016ZX05020-004）、“水基钻井液微纳米级劣质固相清除技术研究”（2016ZX05040-001-002）。

详细信息

作者简介:
易飞,1965年生,教授级高级工程师,现在从事油气田增产,提高采收率及油田化学技术研究与应用工作。

通讯作者:
蒋官澄,1966年生,博士,二级教授,研究领域为油田化学、储层保护等。E-mail:jgc5786@126.com。

中图分类号: TE258
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出版历程
- 收稿日期: 2017-09-16
- 刊出日期: 2017-11-30

Numerical Simulation of Reservoir Damage by Oil/Water Emulsification Based on Hydrodynamic Instability

1. CNOOC EnerTech-Drilling & Production Co., Tianjin, 300450;
2. School of Petroleum Engineering, China University of Petroleum, Beijing 102249;
3. State Key Laboratory of Oil and Gas Resource and Prospecting, China University of Petroleum, Beijing 102249

摘要

摘要: 高含油饱和度的储层钻完井过程往往向近井地带中引入水基工作液，这些水相在后续的生产过程中将与近井地带油相接触掺混，在一定条件下可发生油水乳化导致储层伤害。反之，低含油饱和度的储层使用油基钻井液则向近井引入油相，在后续生产中也可能发生油水乳化。基于水动力不稳定性理论，建立了原油乳化储层伤害的数学模型，并对其进行了数值模拟，得到了乳化损害的时间、空间分布及变化情况，其伤害空间范围局限于井壁附近几十厘米范围内，但由于渗透率损害严重，导致较高的表皮系数。模型基于对油水分相界面在低界面张力和高剪切条件下破裂分散过程的水动力分析，考虑储层孔隙分布特征和乳化液滴堵塞，一定程度上实现了乳化损害的时空模拟和诊断。
- 乳化 /
- 储层伤害 /
- 水动力不稳定性 /
- 时空模拟 /
- 数学模型
Abstract: When drilling and completing reservoirs of high oil saturation, water base fluids will diffuse into the near wellbore region and gradually mixed with oils in the near wellbore area during production. Under some conditions this process will lead to oil/water emulsification which further causes reservoir damage. For reservoirs with low oil saturation drilled with oil base drilling fluids, oil filtrate from the drilling fluids will also diffuse into the near wellbore region, resulting again oil/water emulsification in subsequent production. A mathematical model was established to predict reservoir damage caused by oil/water emulsification based on hydrodynamic instability. The time-distribution, spatial distribution and change of reservoir damage by oil/water emulsification was obtained using this model. The reach of reservoir damage, although is confined within several tens of centimeters around the wellbore, serious permeability impairment results in high skin coefficient. This numerical model, in which the breakdown and dispersion of oil/water interface at low interfacial tensions and high shear rates were hydrodynamically analyzed, and the pore distribution of reservoir rocks and blocking by emulsion drops were taken into account in the simulation, has provided, to some extent, time and spatial simulation and diagnosis of reservoir damage by oil/water emulsification.
- Emulsification /
- Reservoir damage /
- Hydrodynamic instability /
- Time and spatial simulation /
- Mathematical model

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参考文献(14)

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