Downhole pressure compensating device
First Claim
1. A downhole pressure compensating device for use in combination with a downhole tool, comprising:
- a housing with a chamber and an internal hollow section,a first piston dividing the chamber into a first section and a second section, the first section being in fluid communication with a first fluid port, the second section being in fluid communication with a borehole through a second fluid port, anda first spring disposed within the second section to exert a pressure on the first piston to enable conservation of an overpressure in the first section, wherein the device further comprises;
a second piston,a second spring disposed between the first piston and the second piston, andan overpressure channel arranged in the first or the second piston, and in a compressed condition of the second spring, the overpressure channel, provides fluid communication between said first and second sections.
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Accused Products
Abstract
A downhole pressure compensating device includes a housing with a chamber and an internal hollow section, a first piston dividing the chamber into a first section and a second section, the first section being in fluid communication with a first fluid port, the second section being in fluid communication with a borehole through a second fluid port, and a first spring disposed within the second section to exert a pressure on the first piston to enable the conservation of an overpressure in the first section. Furthermore, the device includes second piston, a second spring disposed between the first piston and the second piston, and an overpressure channel arranged in the first or the second piston, which overpressure channel, when the second spring is in a compressed condition, provides fluid communication between said first and second sections.
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Citations
19 Claims
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1. A downhole pressure compensating device for use in combination with a downhole tool, comprising:
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a housing with a chamber and an internal hollow section, a first piston dividing the chamber into a first section and a second section, the first section being in fluid communication with a first fluid port, the second section being in fluid communication with a borehole through a second fluid port, and a first spring disposed within the second section to exert a pressure on the first piston to enable conservation of an overpressure in the first section, wherein the device further comprises; a second piston, a second spring disposed between the first piston and the second piston, and an overpressure channel arranged in the first or the second piston, and in a compressed condition of the second spring, the overpressure channel, provides fluid communication between said first and second sections. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification