Mechanism and application of rock dilation-induced injectivity enhancement in injection wells for offshore oil field

GAO Yanfang; LI Dengke; CHEN Huan; CAO Yanfeng; YU Jifei; WU Shaowei; CHEN Xiao; YUAN Hui; CHEN Zupeng

doi:10.16152/j.cnki.xdxbzr.2025-03-010

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Mechanism and application of rock dilation-induced injectivity enhancement in injection wells for offshore oil field

更新时间：2025-06-26

- Mechanism and application of rock dilation-induced injectivity enhancement in injection wells for offshore oil field
- Journal of Northwest University (Natural Science Edition) Vol. 55, Issue 3, Pages: 613-632(2025)
- 作者机构：
  
  1.西北大学　地质学系/大陆演化与早期生命全国重点实验室，陕西　西安　 710069
  2.中海石油〔中国〕有限公司北京研究中心，北京　 100027
  3.中海石油〔中国〕有限公司湛江分公司，广东　湛江　 524059
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2025-03-010
  CLC： TE5
- Received：31 December 2024，
  
  Published：25 June 2025
- 稿件说明：
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GAO Yanfang, LI Dengke, CHEN Huan, et al. Mechanism and application of rock dilation-induced injectivity enhancement in injection wells for offshore oil field[J]. Journal of northwest university (natural science edition), 2025, 55(3): 613-632.
DOI：

GAO Yanfang, LI Dengke, CHEN Huan, et al. Mechanism and application of rock dilation-induced injectivity enhancement in injection wells for offshore oil field[J]. Journal of northwest university (natural science edition), 2025, 55(3): 613-632. DOI： 10.16152/j.cnki.xdxbzr.2025-03-010.

摘要

通过三轴岩石力学渗流耦合实验，探究了扩容力学参数及渗透率演化规律，建立了扩容诱导微裂缝形态判断准则，定义了有效扩容半径评价扩容增渗效果，并以南海西部油田注水井为例开展扩容数值模拟研究，揭示了岩石扩容弹塑性变形特性及微裂缝发育规律并评价其扩容增渗效果。研究表明，Athabasca油砂和渤海疏松砂岩的剪胀潜力最高，南海西部低渗砂岩的剪胀潜力最低，饱和样品的剪胀潜力高于非饱和样品，温度对剪胀潜力的影响不大。根据抗拉强度、黏聚力和内摩擦角三者的关系及地应力状态，可快速判断海上砂岩扩容微裂缝类型。张性扩容体积应变较小，但其增渗效果优于剪切扩容。提出了剪胀诱导水的有效渗透率模型、损伤渗透率模型，定义了基于超孔隙压力、孔隙度（或体应变）、渗透率增幅和微裂缝发育区的（有效）扩容半径，针对海上低渗油田注水井开展微裂缝形态快速预测和全尺寸井眼数值模拟精细化评价，发现扩容后产生张剪复合微裂缝，有效扩容半径达到12.83 m。研究结果可为海上油田注水扩容技术提供基础理论支撑和施工设计指导。

Abstract

To reveal the elastic-plastic deformation characteristics of rock expansion and the development law of microcracks

and evaluate their expansion and permeability effects

this paper conducts triaxial rock mechanics seepage coupling experiments to explore the expansion mechanics parameters and permeability evolution law

establish expansion-induced microcrack morphology judgment criteria

define effective expansion radius to evaluate expansion and permeability effects

and conduct expansion numerical simulation research using injection wells in the west oilfield of South China Sea as an example. Research has shown that Athabasca oil sands and Bohai loose sandstones have the highest shear dilation potential. In contrast

low-permeability sandstones in the western South China Sea have the lowest shear dilation potential. Saturated samples have higher shear dilation potential than unsaturated samples

and temperature has little effect on shear dilation potential. Based on the relationship between tensile strength

cohesion

internal friction angle

and the state of stress

the type of expansion microcracks in offshore sandstone can be quickly determined. The volumetric strain of tensile expansion is smaller

but its permeability-increasing effect is better than that of shear expansion. The author proposes effective permeability models for water induced by shear dilation

damage permeability models

and permeability evolution models considering interface chemical enhancement. The (effective) dilation radius based on super pore pressure

porosity (or volumetric strain)

permeability improvement

and microcrack development zone is defined. Rapid prediction of microcrack morphology and detailed evaluation of full-size wellbore numerical simulation are carried out for water injection wells in low-permeability offshore oil fields. It is found that after expansion

tension shear composite microcracks are generated

with an effective expansion radius of 12.83m. The research results can provide basic theoretical support and construction design guidance for water injection and expansion technology in offshore oil fields.

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references

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