Understanding the Hidden Fluid Property of Elasticity, Viscosities Influential Cousin

了解弹性、粘度影响的隐藏流体特性

• 批准号: 543455-2019
• 负责人: Kuru, Ergun
• 金额: $ 1.82万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681269
• 关键词: Understanding; Hidden; Fluid; Property; Elasticity

When drilling long horizontal wells, drilled solids tend to settle down on the low side of the wellbore and form a stationary bed, which causes operational difficulties such as excessive torque and drag, slow drilling rate, and in severe cases, stuck pipe, lost circulation, and even loss of the well control. Occasionally, drilling must stop to clean the stationary bed, which is an expensive process and must be done in a timely manner. Understanding how the drilling fluid rheological characteristics affect particle removal from bed deposits is a key to the development of optimum hydraulics program for effective hole cleaning. Most of the fluids used for drilling horizontal wells are of viscoelastic nature. Previous laboratory tests and field experience indicate that fluid elastic properties play important role in cuttings transport and should be given due consideration together with fluid viscous properties in order to have more realistic assessment of the cuttings transport ability of a drilling fluid. Currently there is no practical way to measure and quantify the elasticity of a drilling fluid in the field. An experimental study is, therefore, proposed to fill up this knowledge gap. The main objectives of this study are: i-) to develop a field applicable model that can be used to quantify elasticity by using the measurements from industry standard rheometer; ii-) to develop a methodology to provide the link between lab to field scale analyses and, hence, to facilitate direct application of the experimental results in the development of models for field applications. The number of horizontal wells drilled has dramatically increased over the past decades, however, hole cleaning still remains a challenge especially when drilling long horizontal sections. Efficient hole cleaning strategies need to be developed to reduce time associated with well cleaning. The shorter the hole cleaning time, the more time can be spent on actual drilling and, as a result, the drilling cost can be reduced significantly. Delivering an oil well at lower costs is essential in ensuring accessibility of reserves, which otherwise are not economically sound to exploit. Industry's capacity to operate safely and economically will benefit tremendously from a full-scale experimental research such as the one proposed in this study.

当钻长的水平井时，钻孔的固体倾向于在井眼的低侧沉降，并形成固定床，这会造成操作困难，例如过度的扭矩和拖动，缓慢的钻孔速率，并且在严重的情况下，clot脚，堵塞管道，循环丧失，甚至井控制损失。有时，钻孔必须停止以清洁固定床，这是一个昂贵的过程，必须及时完成。了解钻孔流体流变特征如何影响从床沉积物中去除粒子是开发最佳液压计划以进行有效孔清洁的关键。用于钻井水平井的大多数流体都是粘弹性的。 先前的实验室测试和现场经验表明，流体弹性特性在插条传输中起着重要作用，应适当考虑与流体粘性特性一起，以便对钻孔液的插条传输能力进行更真实的评估。 当前，没有实践方法来测量和量化现场钻孔液的弹性。因此，提议一项实验研究填补这一知识差距。这项研究的主要目标是：i-）开发适用的模型，该模型可通过使用行业标准变性仪的测量来量化弹性； ii-）开发一种方法，以提供实验室与现场尺度分析之间的联系，从而促进直接应用实验结果在现场应用模型的开发中。在过去的几十年中，钻井的水平井数量已大大增加，但是，孔清洁仍然是一个挑战，尤其是在钻长的水平切片时。需要制定有效的孔清洁策略，以减少与清洁井相关的时间。孔清洁时间越短，可以花费更多的时间来进行实际的钻孔，从而可以大大降低钻孔成本。以较低的成本交付油井对于确保储量的可及性至关重要，否则在经济上并不是一个可以利用的储备。行业安全和经济运营的能力将从全面的实验研究中受益匪浅，例如本研究中提出的研究。