Patent ID: 11946330
Assignee: ARDYNE HOLDINGS LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
1. A downhole assembly for use in a low level well, comprising:
a hydrostatic equalisation device, the hydrostatic equalisation device comprising:
a first tubular member with a first end configured to connect to a pipe string, and
a second tubular member configured to move relative to the first tubular member, the second tubular member comprising at least one selectively openable and closeable radial port wherein the at least one radial port is configured to give fluid access between a throughbore of the pipe string and an annulus around the downhole assembly in the open configuration, and the radial port is configured to prevent fluid access between a throughbore of the pipe string and an annulus around the downhole assembly in the closed configuration;

a hydraulic actuator comprising:
a tool body including a central bore and a first end configured to connect to the hydrostatic equalisation device, and
a piston configured to move in a chamber, the chamber comprising an access port from the central bore on a first side of the piston and an exhaust port to the annulus on a second side of the piston; and

a valve, the valve comprising:
an obturating member configured to block fluid flow through the central bore to divert fluid flow from the throughbore into the chamber via the access port;, the downhole assembly comprising a first configuration and a second configuration, wherein:
in the first configuration, the at least one radial port is in the closed configuration and the downhole assembly is configured to allow fluid flow from the throughbore into the chamber via the access port to act on the first side of the piston thereby allowing movement of the piston, relative to the chamber, from a first position to actuate the hydraulic actuator; and
in the second configuration, the at least one radial port is in the open configuration and the downhole assembly is configured to allow fluid flows from the throughbore to the annulus to equalise pressure between the throughbore and the annulus, and on equalisation to allow fluid flows into the chamber via the exhaust port thereby allowing movement of the piston, relative to the chamber, back to the first position to re-set the hydraulic actuator in preparation to repeat actuation of the hydraulic actuator.