US 2016/0258252 A1 · ACTUATION ASSEMBLY USING PRESSURE DELAY

Abstract

A downhole assembly for tool actuation using pressure delay is provided. The downhole assembly can include a chamber, a pressure path, a pressure damper, a pressure source, and a member. The pressure path can be positioned between first and second ends of the chamber. The pressure damper can reduce a rate at which pressure is communicated in the pressure path. Pressure from the pressure source can be communicated to the first end of the chamber and the second end of the chamber at different rates. The member can be positioned in the chamber between the first end and the second end. The member can actuate a downhole tool in response to a pressure difference between the first end and the second end. The pressure difference can result from a difference in between the first rate and the second rate.

Claims20

Dependent claims

A downhole assembly comprising:

a chamber;
a pressure path between a first end of the chamber and a second end of the chamber;
a pressure damper positioned in the pressure path, the pressure damper operable for reducing a rate at which pressure is communicated in the pressure path;
a pressure source in fluid communication with the pressure path and the pressure damper such that a pressure communicated from the pressure source is communicated to the first end of the chamber at a first rate different than a second rate that the pressure from the pressure source is communicated to the second end of the chamber;
and
a member positioned in the chamber between the first end and the second end, the member operable for actuating a downhole tool in response to a pressure difference between the first end and the second end, the pressure difference resulting from a difference in rates between the first rate and the second rate.

3 more elements

A downhole assembly comprising:

a member positioned in a chamber, the member positioned for actuating a downhole tool;
a pressure source operatively coupled with a first end of the chamber for communicating a first pressure to a first end of the member;
a pressure path from the first end of the chamber to a second end of the chamber;
an energy storage device in fluid communication with the second end of the chamber and the pressure path, the energy storage device operable for storing mechanical energy in response to the first pressure being communicated to the energy storage device via the pressure path and operable for communicating a second pressure to a second end of the member in response to a reduction of the first pressure;
a pressure damper positioned in the pressure path between the first end of the chamber and the second end of the chamber, the pressure damper operable for reducing a rate at which the first pressure is communicated to the energy storage device as compared to a rate at which the first pressure is communicated from the pressure source to a first end of the member.

2 more elements

A downhole assembly comprising:

a piston positioned in a chamber and operable for actuating a downhole tool;
a pressure source coupled with a first end of the chamber and operable for communicating a first pressure to a first end of the piston;
a pressure path from the pressure source at the first end of the chamber to a second end of the chamber;
an accumulator in fluid communication with the second end of the chamber and the pressure path, the accumulator operable for storing mechanical energy in response to the first pressure being communicated to the accumulator via the pressure path and operable for communicating at least some of the stored mechanical energy as a second pressure to a second end of the piston in response to a reduction of the first pressure;
a weep valve positioned in the pressure path between the first end of the chamber and the second end of the chamber, the weep valve operable for reducing a rate at which the first pressure is communicated to the accumulator as compared to a rate at which the first pressure is communicated from the pressure source to the first end of the piston.

2 more elements

Dependencies are inferred from the claim text.

Actuation assembly using pressure delay

Life of this patent

Actuation assembly using pressure delay

Life of this patent

Abstract

Claims20