针对海上油田筛管完井的油井常规酸化压裂措施受平台空间局限的问题,研发了过筛管爆燃压裂工艺。运用火药参数优化分析方法,研发了径向燃速为3.57 mm/s(环境压力为6.0 MPa),火药力为669 kJ/kg,耐温可达178 ℃(48 h)的HY-1推进剂火药;利用筛管孔眼压降和压挡液柱井斜模型,编制了高精度筛管完井爆燃压裂模拟软件;进行了地面打靶实验和井下打靶试验,结果显示,火药安全用量不大于3.2 kg/m,且井下峰值压力小于46.8 MPa与地层压力之和时,可达到既能压开储层又不破坏筛管的效果,2口试验井分别取得2.7倍和3.0倍增油的显著效果。过筛管爆燃压裂技术可为海上油田筛管完井的油井的增产增效提供新的技术方向。
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.
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