Switch device with non-addressable scheme for wellbore operations
A non-addressable switch device that is part of a chain of switch devices in a gun string, the non-addressable switch device including a first switch configured to make an electrical connection between an electrical line and another non-addressable switch device of the chain of switch devices; a second switch configured to make an electrical connection between a detonator and the electrical line; and a processor P A connected to the first and second switches and configured to close and open the first and second switches. The processor P A is configured to not use a digital address, and the processor P A is configured to perform one of plural functions based on a corresponding pulse received along the electrical line.
1. A non-addressable switch device that is part of a chain of switch devices in a gun string, the non-addressable switch device comprising:
a first switch configured to make an electrical connection between an electrical line and another non-addressable switch device of the chain of switch devices;
a second switch configured to make an electrical connection between a detonator and the electrical line; and
a processor Pa connected to the first and second switches and configured to close and open the first and second switches,
wherein the processor Pa is configured to not use a digital address, and
wherein the processor Pa is configured to perform one of plural functions based on a corresponding pulse received along the electrical line.
2. The non-addressable switch device of claim 1 , wherein the corresponding pulse is a frequency pulse having a unique frequency.
3. The non-addressable switch device of claim 1 , wherein the processor Pa is configured to receive plural pulses, each pulse of the plural pulses being associated with a different function and a unique frequency.
4. The non-addressable switch device of claim 1 , wherein the processor Pa is configured to automatically enter a sleep mode when the first switch is closed.
5. The non-addressable switch device of claim 4 , wherein the sleep mode prevents the processor Pa to receive instructions and execute the plural functions.
6. The non-addressable switch device of claim 1 , further comprising:
a tank circuit configured to store a voltage having a predetermined value,
wherein the processor Pa is configured to measure the predetermined value and determine, based on the measurement of the predetermined value, whether the non-addressable switch device is freshly powered up or the non-addressable switch device recovered from a short circuit.
7. The non-addressable switch device of claim 6 , wherein the tank circuit includes a resistor connected to the processor Pa, and a capacitor connected between the resistor and ground.
8. The non-addressable switch device of claim 6 , wherein the processor Pa is configured to send a frequency pulse along the electrical line, to a surface controller, when the non-addressable switch device is freshly started and to not send the frequency pulse when the non-addressable switch device recovered from the short circuit.
9. A chain of a plural of non-addressable switch devices comprising:
the plural of the non-addressable switch devices electrically connected to each other through an electrical line; and
plural downhole tools, each downhole tool of the plural downhole tools hosting a corresponding non-addressable switch device of the plural of the non-addressable switch devices, wherein each non-addressable switch device of the plural of the non-addressable switch devices includes,
a first switch configured to make an electrical connection between the electrical line and another non-addressable switch device of the chain of the plural of the non-addressable switch devices;
a second switch configured to make an electrical connection between a corresponding detonator and the electrical line; and
a processor Pa connected to the first and second switches and configured to close and open the first and second switches,
wherein the processor Pa is configured to not use a digital address, and
wherein the processor Pa is configured to perform one of plural functions based on a corresponding pulse received along the electrical line.
10. The chain of the plural of the non-addressable switch devices of claim 9 , wherein only one non-addressable switch device of the chain of the plural of the non-addressable switch devices is awake, and each non-addressable switch device of remaining of the plural of the non-addressable switch devices are either in a sleep mode or not yet connected to the electrical line.
11. The chain of the plural of the non-addressable switch devices of claim 9 , wherein said each non-addressable switch device of the plural of the non-addressable switch devices further includes:
a tank circuit configured to store a voltage having a predetermined value,
wherein the processor Pa is configured to measure the predetermined value and determine, based on the measurement of the predetermined value, whether said each non-addressable switch device is freshly powered up or said each non-addressable switch device recovered from a short circuit.