Downhole activation system that assigns and retrieves identifiers

• US 6,283,227 B1
• Filed: 10/27/1998
• Issued: 09/04/2001
• Est. Priority Date: 10/27/1998
• Status: Expired due to Term

• Current Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Original Assignee: Schlumberger Technology Corporation (Schlumberger NV)
• Inventors: Merlau, David, Lerche, Nolan C.
• Primary Examiner(s): Bagnell, David
• Assistant Examiner(s): SINGH, SUNIL
• Application Number:
  US09/179,507
• Time in Patent Office: 1,043 Days
• Field of Search: 175/4.54, 175/4.55, 166/297, 166/55.1, 166/65.1, 166/66, 361/249, 102/215, 102/217
• US Class Current: 175/4.55
• CPC Class Codes: E21B 41/00 Equipment or details not covered by groups E21B15/00 - E21B40/00
• CPC Class Codes: E21B 43/1185 Ignition systems
• CPC Class Codes: E21B 43/11857 firing indication systems
• CPC Class Codes: F42D 1/05 Electric circuits for blasting

Abstract

A tool activating system includes multiple control units coupled to activate devices in a tool string positioned in a well. A processor is capable of communicating with the control units to send commands to the control units as well as to retrieve information (such as unique identifiers and status) of the control units. Selective activation of the control units may be performed based on the retrieved information. Further, defective control units or devices may be bypassed or skipped over.

Claims

1. A system to activate devices in a tool string for use in a wellbore, comprising:

a central controller;

a cable extending into the wellbore;

control units adapted to communicate bi-directionally with the central controller over the cable;

switches controllable by corresponding control units to enable activation of the devices,

the controller adapted to assign an identifier to each control unit and verify the assigned identifier prior to activation;

circuitry adapted to bypass a defective control unit or device during an activation sequence, wherein the circuitry includes a timing device operatively coupled to the control unit,

the cable coupling the control units; and

cable switches controllable by the central controller to isolate control units from the cable in an open state and to electrically couple control units to the cable in a closed state.

2. The system of claim 1, wherein the devices include perforating units.

3. The system of claim 1, wherein the central controller is adapted to transmit commands to selectively activate one or more of the control units.

4. The system of claim 1, wherein the central controller is adapted to transmit commands to configure each of the control units.

5. The system of claim 4, wherein the configuration includes assigning the corresponding identifier to each control unit.

6. The system of claim 1, wherein a status of each control unit is communicated to the central controller.

7. The system of claim 6, wherein the central controller is adapted to create a list of devices in the tool string and the status of each device.

8. The system of claim 7, wherein the status may indicate a device is defective.

9. An activation system for use with a tool string having multiple devices for use in a wellbore, comprising:

a processor;

control units coupled to control activation of the devices,

each control unit assigned a unique identifier by the processor for selectivity of activation;

a link for extending into the wellbore to enable communication between the processor and the control units; and

switches coupled to the link, each switch when open isolating portions of the link and when closed enabling communications between the portions.

10. The system of claim 9, wherein the identifier includes an address.

11. The system of claim 9, wherein each control unit is adapted to communicate the assigned identifier to the processor for identification.

12. The system of claim 9, wherein each control unit includes a microcontroller.

13. The system of claim 9, wherein the processor is adapted to bypass a defective perforating device or control unit.

14. Apparatus for activation of devices in a tool string in a well, comprising:

a processor;

controllers to control activation of the tool string devices;

a communications link between the processor and the controllers,

the processor adapted to assign identifiers to the controllers and to verify the assigned identifiers by retrieving the assigned identifiers from the controllers;

timing devices operatively coupled to the controllers; and

bypass switches coupled between successive controllers, each timing device timing out after a predetermined time period to activate a corresponding bypass switch if a corresponding controller is defective.

15. The apparatus of claim 14, wherein the communications link includes an electrical cable coupling the controllers to the processor.

16. The apparatus of claim 14, wherein the processor is adapted to selectively activate one of the devices.

17. The apparatus of claim 16, wherein the selective activation is based on a unique identifier assigned to each controller.