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首页> 外文期刊>Journal of Energy Resources Technology >Experimental Investigation on Wellbore Strengthening Based on a Hydraulic Fracturing Apparatus
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Experimental Investigation on Wellbore Strengthening Based on a Hydraulic Fracturing Apparatus

机译：基于水力压裂装置的井眼加固试验研究

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摘要

Lost circulation is a serious problem which always exists in the petroleum industry. Wellbore strengthening by lost circulation materials (LCMs) is a commonly applied method for mitigating lost circulation. This paper presents a hydraulic fracturing apparatus to investigate the effect of material type, concentration, and particle size distribution (PSD) of LCMs on wellbore strengthening behavior. In addition, the characteristics of pressure curves in the fracturing process are analyzed in detail. The results showed that the fracture pressure of the artificial core can be increased by LCMs, and there exists an optimum concentration of LCMs for the maximum wellbore strengthening effect. The LCMs with wide PSD can significantly increase the fracture pressure. However, some LCMs cannot increase or even decrease the fracture pressure; this is resulting from the LCMs with relatively single PSD that makes the quality of mud cake worse. The representative pressure curve in the fracturing process by drilling fluids with LCMs was divided into five parts: the initial cake formation stage, elastic plastic deformation stage, crack stability development stage, crack instability development stage, and unstable plugging stage. The actual fracturing curves were divided into four typical types due to missing of some stages compared with the representative pressure curve. In order to strengthen the wellbore in effective, good LCMs should be chosen to improve the maximum pressure in the elastic plastic deformation stage, extend the stable time of pressure bearing in the crack stability development stage, and control the crack instability development stage.
机译：漏失循环是石油工业中经常存在的严重问题。通过井漏材料（LCM）加固井眼是缓解井漏的常用方法。本文提出了一种水力压裂设备，以研究LCM的材料类型，浓度和粒径分布（PSD）对井眼加固行为的影响。另外，详细分析了压裂过程中压力曲线的特征。结果表明，通过LCMs可以增加人造岩心的断裂压力，并且存在最佳的LCMs浓度以发挥最大的井眼加固效果。具有宽PSD的LCM可以显着增加断裂压力。但是，某些LCM无法增加甚至降低断裂压力。这是由于具有相对单一PSD的LCM导致泥饼的质量变差。 LCMs钻井液在压裂过程中的代表性压力曲线分为五个部分：初始滤饼形成阶段，弹性塑性变形阶段，裂纹稳定性发展阶段，裂纹不稳定性发展阶段和不稳定堵塞阶段。由于与代表性压力曲线相比缺少某些阶段，实际的压裂曲线分为四种典型类型。为了有效地加固井眼，应选择良好的LCMs，以改善弹塑性变形阶段的最大压力，延长裂缝稳定发展阶段承压的稳定时间，并控制裂缝不稳定发展阶段。

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  • 来源
    《Journal of Energy Resources Technology》 |2018年第5期|052902.1-052902.8|共8页
  • 作者

    Cao Cheng; Pu Xiaolin; Zhao Zhengguo; Wang Gui; Du Hui;

  • 作者单位

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China|Tech Univ Clausthal, Energy Res Ctr Lower Saxony, D-38640 Goslar, Germany;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China;

    SINOPEC Zhongyuan Petr Engn Co, Sinopec Oilfield Serv Corp, Drilling Engn Technol Res Inst, Puyang 457000, Henan, Peoples R China;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China;

    Southwest Petr Univ, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610500, Sichuan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    wellbore strengthening; lost circulation materials; fracturing experiments; fracturing pressure; fracturing curve;

    机译：井筒加固;漏失材料;压裂实验;压裂压力;压裂曲线;

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