E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/62
E21B 34/10 (2006.01)
Patent
CA 1179256
ABSTRACT OF THE DISCLOSURE The apparatus according to the invention includes a fluid pressure accumulator which is preferably precharged to a relatively low pressure at the surface, and which is brought to its final pres- sure charge after the apparatus is placed downhole in the well through a valve assembly provided in the apparatus. Pressure charg- ing of the accumulator downhole is accomplished by exposing the accumulator to a downhole pressure, for example the casing pressure, after the apparatus is placed in its downhole position, to increase the accumulator pressure to its desired value, and then sealing off the accumulator so that its charged pressure will thereafter remain constant.
411107
Frayne & Company Robert
Russell Larry R.
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