首页> 外文会议>Geothermal Resources Council Annual Meeting >CO_(2) Resistance, Improved Mechanical Durability, and Successful Placement in a Problematic Lost-Circulation Interval Achieved: Reverse Circulation of Foamed Calcium Aluminate Cement in a Geothermal Well
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CO_(2) Resistance, Improved Mechanical Durability, and Successful Placement in a Problematic Lost-Circulation Interval Achieved: Reverse Circulation of Foamed Calcium Aluminate Cement in a Geothermal Well

机译:CO_(2)电阻,改善机械耐久性,成功放置在有问题的丧失循环间隔中:在地热井中反转泡沫钙铝酸盐水泥的循环

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Drilling in geothermally active locations can pose significant challenges for conventional cement systems and circulation methods. To overcome these challenges in a geothermal well in California, a unique cement system and circulation method was used. This paper details how these technologies and techniques were successfully used in the cementation of one casing string in a geothermal well. Because conventional Portland cement systems are not resistant to chemical attack when CO_(2) and water are present, a special calcium aluminate cement blend was developed to resist this chemical attack. A foamed cement technology was implemented because the excessive stresses that a cement sheath experiences in a geothermal well hinder a normal cement system's capability to withstand the mechanical loading on the cement sheath without cracking. Additionally, a geothermal well often experiences lost-circulation problems that require the reduction of circulation pressures while circulating cement in place. To help minimize these circulation pressures, cement was pumped in reverse. Reverse circulation significantly reduced placement pressures and allowed placement of the cement with no apparent losses.
机译:在地热活动地点钻探可能对传统水泥系统和循环方法构成重大挑战。为了克服加利福尼亚州地热井中的这些挑战,使用了独特的水泥系统和循环方法。本文详细介绍了这些技术和技术如何成功地在地热井中的一个套管串的胶凝中使用。由于当存在CO_(2)和水时,传统的波特兰水泥系统不抵抗化学攻击,因此开发了一种特殊的铝酸钙水泥混合物以抵抗这种化学侵蚀。实施了泡沫的水泥技术,因为过度应力,在地热处理中的水泥鞘体验妨碍正常水泥系统的能力,以承受在水泥护套上的机械负载而不会破裂。另外,地热井经常经历丧失循环问题,要求在循环水泥的同时需要降低循环压力。为了最大限度地减少这些循环压力,水泥反向泵送。反向循环显着降低了放置压力并允许水泥放置没有明显的损失。

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