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DRILL-IN FLUIDS AND DRILLING METHODS DRILL-IN FLUIDS AND DRILLING METHODS
DRILL-IN FLUIDS AND DRILLING METHODS DRILL-IN FLUIDS AND DRILLING METHODS
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机译:钻井液和钻井方法钻井液和钻井方法
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摘要
There is provided a method of drilling an oil or gas well, comprising drilling a wellbore into an underground formation in which a drill bit at the lower end of a drill pipe is placed at the bottom of the wellbore; pumping a first drilling fluid into the wellbore; determining the producing zone of the underground formation; and introducing a second drilling fluid into the wellbore through the drill pipe when the borehole is within the producing zone of the underground formation, wherein the second drilling fluid is a high density drill-in fluid, having a composition different from that of the first drilling fluid and including a brine system with at least one dissolved monovalent salt and at least one dissolved divalent salt together with a suspension polymer, said drilling fluid having a density of at least about 1.50 g/cm3 and a plastic viscosity of less than about 50 lbs/100 ft2.
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机译:提供了一种钻油井或气井的方法,该方法包括将井眼钻入地下地层,在该地下地层中,位于钻杆下端的钻头放置在井眼的底部。将第一种钻井液泵入井眼;确定地下地层的生产区;当井孔在地下地层的生产区内时,通过钻杆将第二钻井液引入井眼,其中第二钻井液是高密度钻井液,其组成与第一次钻井不同。流体,并包括具有至少一种溶解的一价盐和至少一种溶解的二价盐以及悬浮聚合物的盐水系统,所述钻井液的密度至少为约1.50 g / cm3,塑性粘度为小于约50磅/ 100平方呎。
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