PREDICTING AND CONTROLLING HYDRAULIC FRACTURING DURING HORIZONTAL DIRECTIONAL DRILLING
PREDICTING AND CONTROLLING HYDRAULIC FRACTURING DURING HORIZONTAL DIRECTIONAL DRILLING
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DOI：
10.1061/40690(2003)145
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发表时间：
2003-07
期刊：
影响因子：
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通讯作者：
S. Ariaratnam;R. Stauber;J. Bell;B. Harbin;Francis Canon
中科院分区：
文献类型：
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作者：
S. Ariaratnam;R. Stauber;J. Bell;B. Harbin;Francis Canon
水平定向钻井（HDD）承包商目前正面临着更严格的环境审查，因为他们担心水力压裂和钻井液随后迁移到地表。为了解决这些问题，基于两个关键假设进行了一项研究计划：1）如果流体的屈服点，塑性粘度和凝胶强度不能保持在可流动的限度内，则可能发生水力压裂; 2）与土壤类型匹配的钻井液设计对于防止水力压裂至关重要。研究还表明，影响土壤水力压裂的两个主要因素是钻孔压力和覆盖深度。裸眼井中的井眼压力由钻井返回物的重量和流动阻力决定。虽然经验模型，如宾厄姆和赫歇尔-Bulkley流体模型已被用来预测井眼压力，它们的使用受到限制，缺乏信息的流体返回属性。本文介绍了一个实验室测试程序，进行了评估流变性能和流体返回的流动特性，试图预测和控制在HDD安装水力压裂的结果。
Horizontal Directional Drilling (HDD) contractors are currently facing heightened environmental scrutiny due to concerns regarding hydraulic fracturing and subsequent migration of drilling fluids to the surface. To address these concerns, a research program was undertaken based on two critical assumptions: 1) hydraulic fracturing is likely to occur if the yield point, plastic viscosity, and gel strength of the fluid are not maintained within flowable limits; and 2) drilling fluid design matched to soil type is critical in prevention of hydraulic fracturing. Studies have also revealed that the two primary factors affecting hydraulic fracturing in soil are borehole pressure and depth of cover. Borehole pressure in an open borehole is determined by the weight and resistance to flow of the drilling returns. While empirical models such as the Bingham and Herschel-Bulkley fluid models have been employed to predict borehole pressures, their use has been limited by the lack of information on fluid return properties. This paper presents the results of a laboratory testing program that was undertaken to evaluate rheologic properties and flow characteristics of fluid returns in an attempt to predict and control hydraulic fracturing during HDD installations.