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First Application of High Density Fracturing Fluid to Stimulate a High Pressure High Temperature Tight Gas Producer Sandstone Formation of Saudi Arabia

机译:首先应用高密度压裂液,刺激沙特阿拉伯高压高温储气砂岩形成

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Recently Saudi Aramco and international companies started an aggressive gas exploration campaign in tight gas sandstone formations. In most of the cases the prospective tight gas producing zones were discovered at a depth below 20,000 feet where the stress and temperature are extremely high and the reservoir permeability conditions are low; being necessary in all cases to fracture stimulate each horizon to define the fluid and evaluate productivity. The extreme stress and temperature conditions are actually one of the main challenges to perform fracture stimulations on this type of formation, this because the fracturing fluid needs to be stable, induce minimum damage and have good proppant transport capabilities at high temperature conditions. As a part of the referenced exploration activity in the first quarter of 2008 Saudi Aramco has the challenge to perform a proppant fracture stimulation in a deep tight gas on shore sandstone formation where the temperature and stress conditions (375° F and 1.1 psi/ft at 20,000 feet) exceeded the working pressure capability of the available equipment and the existing fracturing fluids application limits. To answer the referenced challenges and knowing that 20,000 psi fracturing equipment is not available in the area an extensive laboratory evaluation was done to design a new high density fracturing fluid. After a lengthy laboratory evaluation, we were able to select a regional supplier for the 1.48 specific gravity (12.3 lb/gal) heavy brine used as the base fluid and prepare a user friendly cross linked fluid for the referenced field application. The new fluid system was successfully mixed and pumped in the field enabled the treatment of the well through lower surface treating pressure with conventional 15,000 psi equipment, lower horsepower requirements, and a safer work environment. The paper summarizes the well conditions, extensive fluid qualification testing, procedures, and specially learned lessons during the referenced first field application of the new fracturing fluid system.^
机译:最近沙特阿美公司和国际公司在致密气砂岩地层开始积极天然气勘探活动。在大多数的预期致密气生产区以低于20000英尺其中应力和温度是非常高,储层渗透率条件较低的深度发现的情况下;在所有情况下都是必要的裂缝刺激每个地平线以定义流体并评估生产率。极端压力和温度条件是实际上的主要挑战之一上这种类型的地层进行压裂增产,这是因为压裂液需要是稳定的,诱导的损害最小,并且具有在高温条件下良好的支撑剂传输能力。如在2008年沙特石油公司第一季度引用的勘探活动的一部分具有到深致密气在岸上砂岩地层进行支撑剂压裂增产的挑战,其中温度和压力条件(375°F和1.1磅/英尺在20000英尺)超出了现有设备的工作压力的能力和现有的压裂液应用程序的限制。要回答引用的挑战,并知道20,000 PSI压裂设备是不具备的地区的广泛的实验室评估做的目的是设计一个新的高密度压裂液。长时间的实验室评估后,我们能够选择一个区域供应商为1.48比重作为基液(12.3磅/加仑),重盐水,并准备一个用户友好的交联流体所引用的领域的应用。新的流体系统被成功混合和外地泵送启用的以及治疗通过与常规15,000psi的设备,低级马力的要求,和更安全的工作环境下的表面处理压力。本文总结了新的压裂液体系的参考第一现场应用过程中很好的条件,广泛的流体资格测试,程序和专门的经验教训。^

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