Patent ID: 8210267
Filing Date: 2012-07-03
Classification: E21B

Abstract:
1. A downhole pressure chamber, comprising: a first tubular having a first end, a second end and a plurality of longitudinal teeth extending radially outwardly from an outer perimetrical surface thereof, the plurality of longitudinal teeth extending longitudinally from the first end to approximately midway between the first end and the second end; a second tubular positioned coaxially with the first tubular having a third end, a fourth end and a plurality of longitudinal teeth extending radially inwardly from an inner perimetrical surface thereof, the plurality of longitudinal teeth extending longitudinally from the third end to approximately midway between the third end and the fourth end, the plurality of longitudinal teeth of the second tubular being axially slidably engaged with the outer perimetrical surface of the first tubular, and the plurality of longitudinal teeth of the first tubular being axially slidably engaged with the inner perimetrical surface of the second tubular, the plurality of longitudinal teeth of the first tubular being longitudinally overlapable with the plurality of longitudinal teeth of the second tubular and the plurality of longitudinal teeth of the first tubular being positioned perimetrically in spaces between the plurality of longitudinal teeth of the second tubular; at least one first seal fixedly sealed to the first tubular at the first end and slidably sealed to the inner perimetrical surface of the second tubular; and at least one second seal fixedly sealed to the second tubular at the third end and slidably sealed to the outer perimetrical surface of the first tubular thereby defining a pressure cavity by the at least one first seal, the at least one second seal and an annular space between the inner perimetrical surface and the outer perimetrical surface.