Theoretical and Experimental Study on Physical Mechanism behind the Formation of Drilling Induced Tensile Wall Fracture (DTF) for Borehole Stabilization

钻孔诱发张拉墙断裂(DTF)形成的物理机制的理论与实验研究

基本信息

  • 批准号:
    13650982
  • 负责人:
  • 金额:
    $ 2.18万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    2001
  • 资助国家:
    日本
  • 起止时间:
    2001 至 2002
  • 项目状态:
    已结题

项目摘要

The advanced logging tools such as FMI and BHTV/UBI tools allow us to see the structure of borehole wall in very detail. The results show that there appear frequently the multiple fractures in an en-echelon pattern on opposite sides of the borehole wall. They are called as the Drilling Induced Tensife Wall Fractures, DTF for short. It is known that they are formed in the borehole wall while drilling, however, it has been not clarified yet how they are formed. In this paper, we investigate the mechanism behind the formation or DTF. To this end, we developed theoreticai models to estimate the critical borehole pressure necessary to initiate inclined fractures at the borehole wall, P_<frac>, and that necessary to link them near the borheole wall, P_<link>. The models are taken into account of thermal stress caused by the difference in temperature of rock and borehole fluid, Dt. Our modeling shows that P_<frac> and P_<link> are changed with borehole orientation, in-situ stresses and Dt. P_<link> can become to be larger than P_<frac> DTF may be observed in such a case. Note that DTF has a small fracture length along the borehole wall suggests a small fracture opening at the borehole wall compared to the opening of large, axial fractures that occur once the small fractures have linked up. If the fracture opening is small, the opening could be sealed with the drilling mud, and significant circulation loss could be prevented. This may be the reason why there was not any indication of lost circulation at the depths where DTF were observed. To verify the present models, laboratory experiments were performed on the PMMA cubical specimens under biaxial compressions. The specimens are transparent, and it allows us to see directly the fracture formation on borehole wall. The borehole was cooled down by injection of liquid nitrogen, and the cooling caused thermal tensile stress to induce DTF on the borehole wall. The experimental results agree well with the model prediction.
先进的测井仪器,如FMI和BHTV/UBI仪器,使我们能够非常详细地了解井壁结构。结果表明,井壁两侧经常出现梯形多条裂缝。它们被称为钻井诱发的廷尼菲墙体裂缝,简称DTF。它们是在钻井过程中在井壁中形成的,但它们是如何形成的,目前还不清楚。在这篇文章中,我们研究了形成DTF的机制。为此,我们建立了理论模型,以估计在井壁P_t;裂缝处引发倾斜裂缝所需的临界井眼压力,以及在井壁附近将它们连接起来所必需的临界井眼压力。该模型考虑了岩石和井筒流体温差dT引起的热应力。我们的模拟表明,P&lt;Frc&Gt;和P&lt;link&gt;随着井眼方位、地应力和DT;而发生变化。在这种情况下,P_&lt;link&>可能会变得大于P_&lt;Frc&>DTF。请注意,DTF沿井壁的裂缝长度较小,这意味着井壁上的裂缝开口较小,而一旦小裂缝连接起来,就会出现大的轴向裂缝。如果裂缝开度较小,则可用钻井液将其封堵,可防止严重的井漏。这可能是为什么在观察到DTF的深处没有任何迹象表明漏出的原因。为了验证所提出的模型,对PMMA立方体试件进行了双向压缩的室内试验。样品是透明的,它使我们能够直接看到井壁上的裂缝形成。通过注入液氮对井筒进行降温,冷却过程中产生的热拉应力在井壁上产生DTF。实验结果与模型预测结果吻合较好。

项目成果

期刊论文数量(5)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
伊藤高敏, 林一夫, 山本晃司: "坑井壁面き裂(DTF)の発生機構と制御法に関する理論的及び実験的検討"平成14年度石油技術協会春季講演会シンポジウム・個人講演要旨集. 88 (2002)
伊藤隆俊、林一雄、山本幸二:《井壁裂缝(DTF)发生机制及控制方法的理论与实验研究》2002年日本石油学会春季会议研讨会/个人讲座摘要88(2002)。
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    0
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T.Ito, K.Hayashi, K.Yamamoto: "Theoretical and Experimental Study on Drilling Induced Tensile Wall Fracture"Abstracts of 2002 Technical Meeting of the Japanese Association for Petroleum Technology. 88 (2002)
T.Ito、K.Hayashi、K.Yamamoto:“钻井诱发拉伸壁断裂的理论与实验研究”日本石油技术协会2002年技术会议摘要。
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    0
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T.Ito, M.D.Zoback, P.Peska: "Utilization of Mud Weights in Excess of the Least Principal Stress to Stabilize Wellbores : Theory and Practical Examples"SPE Drilling & Completion. Vol.16・No.4. 221-229 (2001)
T.Ito、M.D.Zoback、P.Peska:“利用超过最小主应力的泥浆重量来稳定井筒:理论和实践示例”SPE 钻井与完井第 16 卷·第 4 期(2001 年)。 )
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    0
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伊藤高敏, 林一夫, 山木晃司: "坑井壁面き裂(DTF)の発生機構と制御法に関する理論的及び実験的検討"平成14年度石油技術協会春季講演会シンポジウム・個人講演要旨集. 88 (2002)
伊藤隆俊、林一雄、山木浩二:《井壁裂缝(DTF)发生机制及控制方法的理论与实验研究》2002年日本石油学会春季研讨会及个人讲座摘要88(2002)。
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    0
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伊藤高敏, 岩谷悠平, 林一夫: "坑井壁面の引張き裂(Drilling Induced Tensile Wall Fracture)発生挙動の室内実験による検討"平成14年度資源・素材学会春季大会講演要旨集. (発表予定). (2002)
Takatoshi Ito、Yuhei Iwatani、Kazuo Hayashi:“通过实验室实验研究井壁上钻井引起的拉伸壁断裂的行为”日本自然资源与材料学会 2002 年春季会议摘要(待提交)。 2002)
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ITO Takatoshi其他文献

ITO Takatoshi的其他文献

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{{ truncateString('ITO Takatoshi', 18)}}的其他基金

Experimental study of fracture tip screen-out with aid of X-ray CT considering its application to fracture control
X射线CT辅助骨折端筛选实验研究及其在骨折控制中的应用
  • 批准号:
    16K14520
  • 财政年份:
    2016
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Development of Deep Rock Stress Tester Based upon Hydraulic Fracturing and Diametrical Core Deformation Analysis
基于水力压裂和岩芯直径变形分析的深部岩石应力测试仪研制
  • 批准号:
    24246147
  • 财政年份:
    2012
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Development of the method to remedy leakage from geological CO2 reservoir using CO2 reactive grout
开发利用CO2活性灌浆修复CO2地质储层渗漏的方法
  • 批准号:
    21360442
  • 财政年份:
    2009
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Theoretical Analysis of Exchange Rate Fluctuations and Applied Analysis of High Frequency Data
汇率波动的理论分析与高频数据的应用分析
  • 批准号:
    20243014
  • 财政年份:
    2008
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
A New Strategy and Its Verification for In-situ Measurements of the Maximum and Minimum Stresses at Deep Depths by Hydraulic Fracturing
水力压裂原位测量深部最大最小应力新策略及其验证
  • 批准号:
    18360429
  • 财政年份:
    2006
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Theoretical and Empirical Analysis of The Foreign Exchange Rate Fluctuations
汇率波动的理论与实证分析
  • 批准号:
    15203008
  • 财政年份:
    2003
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Thermoelastically-induced fracture permeability enhancement associated with cold fluid injection
与冷流体注入相关的热弹性诱导裂缝渗透率增强
  • 批准号:
    15560700
  • 财政年份:
    2003
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
In-situ stress monitoring based on variation in electrical property of rock associated with micro-crack closure
基于与微裂纹闭合相关的岩石电特性变化的地应力监测
  • 批准号:
    11650076
  • 财政年份:
    1999
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Target Zone and International Policy Coordination
目标区和国际政策协调
  • 批准号:
    02630048
  • 财政年份:
    1990
  • 资助金额:
    $ 2.18万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

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超高性能纤维混凝土的剪切和拉伸断裂表征
  • 批准号:
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