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1. WO2020198643 - CIRCUIT DE MISE À FEU DOUBLE À SEMI-CONDUCTEURS

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

What is claimed is:

1. A method for firing a detonator comprising:

lowering a perforating gun string into a wellbore to a predetermined location;

raising the voltage on the wireline to signal a solid state dual firing circuit within the perforating gun string to energize a detonator;

energize the detonator;

opening the detonator;

firing a first perforating gun; and

lower the voltage of the wireline.

2. The method of claim 1 further comprising reversing the polarity of the wireline voltage and ramping up the reverse polarity voltage to fire a second perforating gun.

3. The method of claim 1 further comprising deactivating electrically powered instruments coupled to the perforating gun string.

4. The method of claim 1 further comprising deactivating a gamma tool integral with the perforating gun string.

5. A solid state dual fire circuit comprising:

a transformer with a primary coil, a first secondary coil, a second secondary coil, and a third secondary coil;

a first MOSFET (Q 1), wherein the first MOSFET controls whether the bottom of the tool is shorted to ground;

a second MOSFET (Q5), wherein the second MOSFET engages or disengages a voltage clamp; a third MOSFET (Q7), wherein the third MOSFET controls power to tools coupled to the perforating gun string; wherein the voltage clamp when activated energizes a detonator in the perforating gun string.

6. The solid state dual fire circuit of claim 5 further comprising a fourth MOSFET (Q8), wherein the fourth MOSFET controls power to the transformer.

7. The solid state dual fire circuit of claim 5 further comprising a fifth MOSFET (Q2), wherein the fifth MOSFET regulates the voltage drop from the top of the tool to the bottom of the tool.

8. The solid state dual fire circuit of claim 5 wherein first MOSFET (Ql) is a depletion mode MOSFET.

9. The solid state dual fire circuit of claim 5 wherein the first MOSFET (Ql) is controlled by the voltage of the second secondary coil of the transformer.

10. The solid state dual fire circuit of claim 6 further comprising a Zener diode coupled to the fourth MOSFET.

11. The solid state dual fire circuit of claim 5 wherein the second MOSFET (Q5) is an enhancement MOSFET.

12. The solid state dual fire circuit of claim 5 wherein the second MOSFET (Q5) is powered by the first secondary windings of the transformer.

13. The solid state dual fire circuit of claim 5 wherein the third MOSFET (Q7) is a depletion mode MOSFET.

14. The solid state dual fire circuit of claim 5 wherein the third MOSFET (Q7) is powered by the third secondary windings of the transformer.

15. The solid state dual fire circuit of claim 5 further comprising a 555 timer controlling the excitation of the transformer.

16. The solid state dual fire circuit of claim 5 further comprising a fifth MOSFET (Q2), wherein the fifth MOSFET regulates the bottom of tool output current to a maximum level.

17. The solid state dual fire circuit of claim 5 further comprising a fourth MOSFET (Q8), wherein the fourth MOSFET provides a constant current output to provide a control voltage.

18. The solid state dual fire circuit of claim 5 further comprising a control voltage with energy storage element capacitor (C4) to provide adequate transformer primary current.

19. The solid state dual fire circuit of claim 5 further comprising a resistor (R14) in series with MOSFET (Q2) for regulating the voltage drop from the top of the tool to the bottom of the tool.

20. The solid state dual fire circuit of claim 5 further comprising temperature compensating diodes (D10, D14, D17, D18) in series with Zener diode (D7).