Compositions and methods for well completions

作者: Nikole Strickler , Mitch Rice , Robert Williams , Deepak Khatri

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摘要: Expansive cements for use in cementing subterranean wells contain an encapsulated gas-generating substance. The substance comprises one or more materials that release hydrogen, nitrogen both. is by a coating comprising polymer. prevents premature gas at the surface during slurry mixing, and promotes desired location well. released may also control internal pore pressure of cement slurry, thereby inhibiting invasion formation fluids into borehole.

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