초록 ▼

A method and apparatus for controlling a transient underbalance condition is provided. Transient underbalance can be enhanced by using a porous material, such as a porous solid, around the explosive device. The porous material contains a volume to receive wellbore fluids in response to activation of

A method and apparatus for controlling a transient underbalance condition is provided. Transient underbalance can be enhanced by using a porous material, such as a porous solid, around the explosive device. The porous material contains a volume to receive wellbore fluids in response to activation of the explosive device. This causes a local drop in pressure, which enhances the transient underbalance effect. In another application, it is desired to reduce the transient underbalance effect. This is accomplished by reducing the pressure drop generated as a result of explosive detonation. In one arrangement, the shot density is reduced by using solid masses.

대표청구항 ▼

A method and apparatus for controlling a transient underbalance condition is provided. Transient underbalance can be enhanced by using a porous material, such as a porous solid, around the explosive device. The porous material contains a volume to receive wellbore fluids in response to activation of

A method and apparatus for controlling a transient underbalance condition is provided. Transient underbalance can be enhanced by using a porous material, such as a porous solid, around the explosive device. The porous material contains a volume to receive wellbore fluids in response to activation of the explosive device. This causes a local drop in pressure, which enhances the transient underbalance effect. In another application, it is desired to reduce the transient underbalance effect. This is accomplished by reducing the pressure drop generated as a result of explosive detonation. In one arrangement, the shot density is reduced by using solid masses. obs et al.; US-4344483, 19820800, Fisher et al.; US-4353418, 19821000, Hoekstra et al.; US-4359687, 19821100, Vinegar et al.; US-4363361, 19821200, Madgavkar et al.; US-4366668, 19830100, Madgavkar et al.; US-4378048, 19830300, Madgavkar et al.; US-4381641, 19830500, Madgavkar et al.; US-4384613, 19830500, Owen et al.; US-4384948, 19830500, Barger; US-4390067, 19830600, Wilman; US-4396062, 19830800, Iskander; US-4397732, 19830800, Hoover et al.; US-4398151, 19830800, Vinegar et al.; US-4407973, 19831000, van Dijk et al.; US-4409090, 19831000, Hanson et al.; US-4412124, 19831000, Kobayashi; US-4412585, 19831100, Bouck; US-4423311, 19831200, Varney, Sr.; US-4444255, 19840400, Geoffrey et al.; US-4444258, 19840400, Kalmar; US-4448251, 19840500, Stine; US-4448252, 19840500, Stoddard et al.; US-4456065, 19840600, Heim et al.; US-4457365, 19840700, Kasevich et al.; US-4457374, 19840700, Hoekstra et al.; US-4458757, 19840700, Bock et al.; US-4463807, 19840800, Stoddard et al.; US-4476927, 19841000, Riggs; US-4479541, 19841000, Wang; US-4485869, 19841200, Sresty et al.; US-4489782, 19841200, Perkins; US-4498535, 19850200, Bridges; US-4501326, 19850200, Edmunds; US-4501445, 19850200, Gregoli; US-4508170, 19850400, Littmann; US-4513816, 19850400, Hubert; US-4524113, 19850600, Lesieur; US-4524826, 19850600, Savage; US-4524827