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A downhole tool gun string assembly comprises a first perforating gun operable to generate a first pressure at a first location in a wellbore, wherein the first perforating gun comprises a first plurality of perforating charges; a second perforating gun operable to generate a second pressure at a se

A downhole tool gun string assembly comprises a first perforating gun operable to generate a first pressure at a first location in a wellbore, wherein the first perforating gun comprises a first plurality of perforating charges; a second perforating gun operable to generate a second pressure at a second location in the wellbore, wherein the second pressure is different from the first pressure and the second perforating gun comprises a second plurality of perforating charges, and wherein at least one of the second plurality of perforating charges is operably associated with a secondary pressure generator, where the first perforating gun and the second perforating gun are configured to maintain a pressure at a selected location in the wellbore below a threshold when the first and second perforating guns are activated substantially concurrently.

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1. A downhole tool gun string assembly comprising: a first perforating gun operable to generate a first pressure at a first location in a wellbore, wherein the first perforating gun comprises a first plurality of perforating charges;a second perforating gun operable to generate a second pressure at

1. A downhole tool gun string assembly comprising: a first perforating gun operable to generate a first pressure at a first location in a wellbore, wherein the first perforating gun comprises a first plurality of perforating charges;a second perforating gun operable to generate a second pressure at a second location in the wellbore, wherein the second pressure is different from the first pressure and the second perforating gun comprises a second plurality of perforating charges, and wherein at least one of the second plurality of perforating charges is operably associated with a secondary pressure generator,wherein the first perforating gun and the second perforating gun are configured to maintain a pressure at a selected location in the wellbore below a threshold when the first perforating gun and the second perforating gun are activated substantially concurrently. 2. The gun string assembly of claim 1, further comprising a blank pipe section disposed between the first perforating gun and the second perforating gun. 3. The gun string assembly of claim 1, wherein at least one perforating charge of the second plurality of perforating charges is not operably associated with a secondary pressure generator, and wherein the ratio of perforating charges not operably associated with the secondary pressure generator to the at least one perforating charges that are operably associated with the secondary pressure generator is between about 1:100 and 100:1. 4. The gun string assembly of claim 1, wherein the first plurality of perforating charges are not operably associated with a secondary pressure generator, and wherein the second plurality of perforating charges are all operably associated with a secondary pressure generator. 5. The gun string assembly of claim 4, wherein the threshold at the location is a pressure differential across a zonal isolation device of about 20,000 psi. 6. The gun string assembly of claim 1, wherein the at least one of the second plurality of perforating charges that is operably associated with a secondary pressure generator comprises at least one of: a big-hole charge, and a deep-penetrating charge. 7. The gun string assembly of claim 1, wherein the secondary pressure generator comprises a coating on the at least one of the second plurality of perforating charges. 8. The gun string assembly of claim 1, wherein the secondary pressure generator comprises at least a portion of a charge case of the at least one of the second plurality of perforating charges. 9. The gun string assembly of claim 1, wherein the secondary pressure generator comprises at least a portion of a liner of the at least one of the second plurality of perforating charges. 10. The gun string assembly of claim 1, wherein the secondary pressure generator comprises at least a portion of an explosive of the at least one of the second plurality of perforating charges. 11. The gun string assembly of claim 1, wherein the secondary pressure generator comprises a reactive material selected from the group consisting of: a phyrophoric material, a combustible material, a mixed rare earth alloy, a pyrotechnic composition, and any combination thereof. 12. The gun string assembly of claim 1, wherein the secondary pressure generator comprises a material selected from the group consisting of: zinc, aluminum, bismuth, tin, calcium, cerium, cesium, hafnium, iridium, lead, lithium, palladium, potassium, sodium, magnesium, titanium, zirconium, cobalt, chromium, iron, nickel, tantalum, depleted uranium, mischmetal, any alloy thereof, any carbide thereof, any hydride thereof, and any combination thereof. 13. The gun string assembly of claim 1, wherein the secondary pressure generator comprises a material selected from the group consisting of: boron(III) oxide, silicon(IV) oxide, chromium(III) oxide, manganese(IV) oxide, iron(III) oxide, iron(II, III) oxide, copper(II) oxide, lead(II, III, IV) oxide, and any combination thereof. 14. A downhole tool gun string assembly comprising: a first perforating gun operable to generate a first pressure at a first location in a wellbore, wherein the first perforating gun comprises a first plurality of perforating charges;a second perforating gun operable to generate a second pressure at a second location in the wellbore, wherein the second perforating gun comprises a second plurality of perforating charges;a blank pipe section disposed between the first perforating gun and the second perforating gun, wherein the blank pipe section comprises a secondary pressure generator, and wherein the secondary pressure generator is operably associated with at least one of the first perforating gun or the second perforating gun,wherein the first perforating gun, the second perforating gun, and the blank pipe section are configured to maintain a pressure at a selected location in the wellbore below a threshold when the first perforating gun and the second perforating gun are activated substantially concurrently. 15. The gun string assembly of claim 14, wherein the blank pipe section comprises a thermobaric container comprising a reactive material. 16. The gun string assembly of claim 14, wherein the reactive material comprises at least one of a sleeve or a coating on the interior of the blank pipe section. 17. The gun string assembly of claim 14, wherein the reactive material comprises at least one of a sleeve or coating on the exterior of the blank pipe section. 18. The gun string assembly of claim 14, wherein the reactive material comprises a component of a punch charge, wherein the punch charge is configured to create an opening through the blank pipe section. 19. The gun string assembly of claim 14, wherein the secondary pressure generator comprises a reactive material selected from the group consisting of: a phyrophoric material, a combustible material, a mixed rare earth alloy, a pyrotechnic composition, and any combination thereof. 20. The gun string assembly of claim 14, wherein the secondary pressure generator comprises a material selected from the group consisting of: zinc, aluminum, bismuth, tin, calcium, cerium, cesium, hafnium, iridium, lead, lithium, palladium, potassium, sodium, magnesium, titanium, zirconium, cobalt, chromium, iron, nickel, tantalum, depleted uranium, mischmetal, any alloy thereof, any carbide thereof, any hydride thereof, and any combination thereof.