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HIGH TEMPERATURE FILTRATION CONTROL USING WATER BASED DRILLING FLUID SYSTEMS COMPRISING WATER SOLUBLE POLYMERS
HIGH TEMPERATURE FILTRATION CONTROL USING WATER BASED DRILLING FLUID SYSTEMS COMPRISING WATER SOLUBLE POLYMERS
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机译:包含水溶性聚合物的水基钻井液系统的高温过滤控制
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摘要
A method and drilling fluid system for providing filtration control during drilling operations using a drilling fluid system comprising water soluble polymer comprising acrylamide monomer, the method comprising: providing a drilling fluid system having effective rheological properties, the drilling fluid system comprising aqueous base consisting essentially of freshwater, a quantity of from about 21 to 58 kg/m3(7.5 to about 20 pounds per barrel) plugging agent, and an amount of bridging agent comprising water soluble polymer comprising acrylamide monomer which exhibits a 5% by weight Brookfield viscosity in freshwater of from about 50 cP to about 100 cP, and; contacting a subterranean formation with the drilling fluid system and maintaining effective filtration control at concentrations of about 10,000 ppm or less monovalent salt, as demonstrated in the laboratory by producing a HPHT filtrate of 25 cm3/min or less after 30 minutes at about 149°C (300 °F) after static aging of said drilling fluid system for a period of 16 hours or more at temperatures of about 260°C (500°F).
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机译:一种用于在钻井作业期间使用包括具有丙烯酰胺单体的水溶性聚合物的钻井液系统提供过滤控制的方法和钻井液系统,该方法包括:提供具有有效流变性质的钻井液系统,所述钻井液系统包括基本上由以下组成的水性碱:淡水,约21至58 kg / m3(每桶7.5至约20磅)的堵漏剂,以及一定量的桥联剂,其中包括水溶性聚合物,该聚合物包含在淡水中具有5wt%的布鲁克菲尔德粘度的丙烯酰胺单体。从约50cP到约100cP,和;使地下地层与钻井液系统接触并在约10,000 ppm或更低的一价盐浓度下保持有效的过滤控制,如在实验室中通过在约149°C下30分钟后产生25 cm3 / min或更低的HPHT滤液所证明的那样在约260°C(500°F)的温度下使所述钻井液系统静态老化16小时或更长时间后(300°F)。
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