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US 7,007,756 B2Granted
Providing electrical isolation for a downhole device
AssigneeSchlumberger Technology Corporation
InventorsNolan C. Lerche, James E. Brooks, Choon Fei Wong
Life of this patent
Estimating the term…
Abstract
An isolation apparatus is provided between an electrical conductor and an electrically-activated well tool. The isolation apparatus has a blocking element to enable a signal having a first electrical polarity to pass through the element. The blocking element blocks a signal having a second electrical polarity.
Claims29
A tool string for use in a well, comprising:
- an electrical conductor;
- an electrically-activated well tool having a switch and an electrically-activated component coupled to the switch;
- and
- an isolation apparatus between the electrical conductor and the well tool, the isolation apparatus comprising a blocking element to enable a signal having a first electrical polarity to pass through the element, and the blocking element to block a signal having a second electrical polarity from reaching the switch in the well tool.
1 more element
A tool string for use in a well, comprising:
- an electrical conductor;
- an electrically-activated well tool;
- and
- an isolation apparatus between the electrical conductor and the well tool, the isolation apparatus comprising a blocking element to enable a signal having a first electrical polarity to pass through the element, and the blocking element to block a signal having a second electrical polarity from passing through the blocking element,
- wherein the first electrical polarity is a negative polarity, and the second electrical polarity is a positive polarity.
2 more elements
A tool string for use in a well, comprising:
- an electrical conductor;
- an electrically-activated well tool;
- an isolation apparatus between the electrical conductor and the well tool, the isolation apparatus comprising a blocking element to enable a signal having a first electrical polarity to pass through the element, and the blocking element to block a signal having a second electrical polarity from passing through the blocking element;
- and
- a first switch coupled to the electrical conductor,
- the first switch activatable to enable communication of a signal from the electrical conductor to the electrically-activated well tool,
- wherein the isolation apparatus further comprises a control unit to control activation of the first switch,
- wherein the isolation apparatus further comprises one or more additional switches in series with the first switch, the control unit to control activation of the switches.
5 more elements
A tool string for use in a well, comprising:
- an electrical conductor;
- an electrically-activated well tool;
- and
- an isolation apparatus between the electrical conductor and the well tool, the isolation apparatus comprising a blocking element to enable a signal having a first electrical polarity to pass through the element, and the blocking element to block a signal having a second electrical polarity from passing through the blocking element,
- wherein the isolation apparatus further comprises a filter to block radio frequency signals from reaching the electrically-activated well tool.
2 more elements
A tool string for use in a well, comprising:
- an electrical conductor;
- an electrically-activated well tool;
- an isolation apparatus between the electrical conductor and the well tool, the isolation apparatus comprising a blocking element to enable a signal having a first electrical polarity to pass through the element, and the blocking element to block a signal having a second electrical polarity from passing through the blocking element;
- and
- a tractor, the isolation apparatus between the tractor and the well tool.
2 more elements
An apparatus to isolate signaling in an electrical conduit from a downhole device, the apparatus comprising:
- a blocking element adapted to enable a signal having a first electrical polarity to pass through,
- the blocking element adapted to block a signal having a second electrical polarity from passing through the blocking element;
- and
- a clamp adapted to electrically conduct in response to the signal of the first electrical polarity having greater than a predetermined magnitude.
1 more element
An isolation assembly to isolate a downhole component from electrical signaling in an electrical conduit, comprising:
- a diode to block electrical signaling in the electrical conduit having a positive polarity;
- a switch having an open state and a closed state, the switch in the open state to block electrical signaling in the electrical conduit from communicating to the downhole component, and the switch in the closed state to communicate electrical signaling in the electrical conduit to the downhole component;
- and
- a fuse in series with the diode.
1 more element
A method for use in a wellbore, comprising:
- providing a tool string having an electrical conduit, an electrically-activated tool, and an isolation assembly between the electrical conduit and the electrically-activated tool;
- blocking electrical signaling of a first polarity with a blocking element in the isolation assembly;
- enabling electrical signaling of a second polarity to pass through the blocking element;
- and
- activating a clamp to electrically conduct in response to the electrical signaling of the second polarity having greater than a predetermined magnitude.
2 more elements
Dependencies are inferred from the claim text.