Abstract: Aiming at the problem that conventional acid fracturing measures for oil wells with screen completion in offshore oilfields are limited by platform space, a screen-through deflagration fracturing technology was developed. The HY-1 propellant with a radial burning rate of 3.57 mm/s (ambient pressure of 6.0 MPa), an impetus of 669 kJ/kg, and a heat resistance of up to 178 ℃(48 h) has been developed with the optimization analysis method of propellant parameters; high-precision screen-completion deflagration fracturing simulation software was developed based on the screen pressure drop in wellbore and the well deviation model with pressurized liquid column; ground and downhole targeting tests were conducted and the results indicated that when the safe dosage of propellant was no more than 3.2 kg/m, and the downhole peak pressure was less than 46.8 MPa and the sum of formation pressure, the deflagration could fracture the reservoir without damage to the screen, and achieved remarkable effect in the two test wells by 2.7 times and 3.0 times of oil enhancement respectively. The screen-through deflagration fracturing technology indicates a new technical direction for the stimulation of oil wells with screen completion in offshore oilfields.

Key words: deflagration fracturing, screen completion, fracturing, gunpowder, offshore oilfield