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Significance and complications of drilling fluid rheology in geothermal drilling: A review
Geothermics ( IF 3.5 ) Pub Date : 2021-02-23 , DOI: 10.1016/j.geothermics.2021.102066
Abdelmjeed Mohamed , Saeed Salehi , Ramadan Ahmed

The harsh downhole conditions of high pressure and high temperature (HPHT) encountered in geothermal wells make the drilling operation challenging. Drilling in such environments requires a special drilling mud formulation with high thermal stability and good rheological properties to fulfill the drilling fluid functions. Therefore, great efforts should be put into selecting the suitable drilling fluid, optimize and monitor the drilling fluid properties throughout drilling operations, and predicting its performance under downhole conditions. Rheological properties significantly impact many drilling parameters such as hole cleaning, fluid and wellbore stability, wellbore hydraulics, torque and drag, and other drilling issues. This paper discusses water-based drilling fluids' flow behavior under HPHT conditions and highlights the significance of fluid rheology in geothermal drilling. The common challenges and complications related to fluid rheology encountered in geothermal drilling are addressed in this paper, such as hole cleaning, wellbore hydraulics, and drilling fluid stability. This article also reviews the recent advances in drilling mud systems, rheology enhancement, and rheological properties measurements at surface and subsurface conditions. Moreover, the rheology models of drilling fluid at elevated temperatures are reviewed to fully understand their flow behavior and establish a method for drilling engineers to optimize fluid formulations for geothermal drilling.



中文翻译:

钻井液流变学在地热钻井中的意义和复杂性:综述

在地热井中遇到的苛刻的高压和高温(HPHT)井下条件使钻井作业具有挑战性。在这样的环境中进行钻井需要具有高热稳定性和良好流变性的特殊钻井泥配方,以实现钻井液的功能。因此,应该花大力气选择合适的钻井液,在整个钻井过程中优化和监控钻井液的性能,并预测其在井下条件下的性能。流变性质显着影响许多钻井参数,例如井眼清洁,流体和井眼稳定性,井眼液压,扭矩和阻力以及其他钻井问题。本文讨论了水性钻井液的 HPHT条件下的流动行为,并突出了流体流变学在地热钻探中的重要性。本文讨论了与地热钻井过程中遇到的与流体流变学相关的常见挑战和复杂性,例如井眼清洁,井筒水力学和钻井液稳定性。本文还回顾了钻井泥浆系统,流变增强和在地面和地下条件下的流变性能测量方面的最新进展。此外,审查了高温下钻井液的流变模型,以充分了解其流动特性,并为钻井工程师建立了一种方法来优化地热钻井液配方。本文讨论了与地热钻井过程中遇到的与流体流变学相关的常见挑战和复杂性,例如井眼清洁,井筒水力学和钻井液稳定性。本文还回顾了钻井泥浆系统,流变增强和在地面和地下条件下的流变性能测量方面的最新进展。此外,审查了高温下钻井液的流变模型,以充分了解其流动特性,并为钻井工程师建立了一种方法,以优化地热钻井液的配方。本文讨论了与地热钻井过程中遇到的与流体流变学相关的常见挑战和复杂性,例如井眼清洁,井筒水力学和钻井液稳定性。本文还回顾了钻井泥浆系统,流变增强和在地面和地下条件下的流变性能测量方面的最新进展。此外,审查了高温下钻井液的流变模型,以充分了解其流动特性,并为钻井工程师建立了一种方法,以优化地热钻井液的配方。在地表和地下条件下的流变性能测量。此外,审查了高温下钻井液的流变模型,以充分了解其流动特性,并为钻井工程师建立了一种方法,以优化地热钻井液的配方。在表面和地下条件下的流变性能测量。此外,审查了高温下钻井液的流变模型,以充分了解其流动特性,并为钻井工程师建立了一种方法来优化地热钻井液配方。

更新日期:2021-02-23
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