US 2026/0298037 A1Published application

System for lowering pipes in a pipe string

OwnerKent R. Madisoninventor

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Abstract

A system for controlled lowering of pipes includes a hydraulic cylinder, a hydraulic reservoir, and force transducer coupled to a first pipe and to a cable that is arranged to lower the first pipe onto a second pipe disposed within a well. The hydraulic cylinder includes a fluid chamber and a piston movably disposed within the fluid chamber, and the hydraulic reservoir is fluidly coupled to the fluid chamber of the hydraulic cylinder through a first fluid passageway. The first fluid passageway includes a first valve that controls fluid through the first fluid passageway. A controller in communication with the force transducer and the first valve is configured to operate the first valve to control flow of hydraulic fluid out of the hydraulic cylinder to lower the first pipe onto the second pipe in a controlled manner.

Claims20

Dependent claims

A system for lowering pipes, the system comprising:

a force transducer comprising a first end portion and a second end portion, the first end portion configured to be coupled to a cable that is arranged to lower a first pipe onto a second pipe disposed within a well;
a hydraulic cylinder coupled to the second end portion of the force transducer, wherein the hydraulic cylinder comprises a fluid chamber and a piston movably disposed within the fluid chamber, and wherein a rod of the piston is configured to be coupled to a second end portion of the first pipe;
a hydraulic reservoir fluidly coupled to the fluid chamber of the hydraulic cylinder through a first fluid passageway comprising a first valve and a second fluid passageway comprising a second valve;
and
a controller in communication with the force transducer and with the first valve, the controller configured to operate the first valve to control flow of hydraulic fluid out of the hydraulic cylinder to lower the first pipe onto the second pipe based at least in part on data from the force transducer.

2 more elements

A system comprising:

a sensor comprising a first end portion and a second end portion, the first end portion configured to be coupled to a cable that is arranged to lower a first pipe onto a second pipe disposed within a well, wherein the sensor is configured to sense a sensed force indicative of a weight of the first pipe;
a hydraulic cylinder coupled to the second end portion of the sensor, wherein the hydraulic cylinder comprises a fluid chamber and a piston movably disposed within the fluid chamber, and wherein a rod of the piston is configured to be coupled to a second end portion of the first pipe;
and
a hydraulic reservoir fluidly coupled to the fluid chamber of the hydraulic cylinder via a valve that is configured to be movable between an open state and a closed state;
and
a control system configured to:
receive a sensed force from the sensor;
determine a difference between the sensed force and a selected force setting, the difference being a force error;
calculate a state of the valve to reduce the force error;
and
transmit a control signal to the valve to move the valve to the calculated state.

8 more elements

Dependencies are inferred from the claim text.