“压胀松动”增产技术

STIMULATION TECHNIQUE OF "LOOSENING ROCK BY THE DILATANCY OF EXPLOSIVE WAVES"

岩石产生“压胀”的同时其孔隙度和渗透率也增加,且这种孔隙度和渗透率的增加是不可逆的。“压胀松动”增产技术就是利用岩石的“压胀”特性,利用炸药分级爆炸产生的爆炸波在地层的叠加来满足储层岩石产生“压胀”的条件,从而达到增加近井地带储层的渗透率、使油气井增产早的目的。文章对不同岩石“压胀”特性、“压胀松动”增产技术的基本原理进行了研究,对该技术的现场用炸药药量的计算及弹体进行了设计,对现场试验应用情况进行了总结。现场试验表明该技术对油气田开采具有较好的增产效果。

The rock is subjected to three main stresses, and the biggest stress is much bigger than the smallest one, the volume of the rock is not reducing but increasing, at the same time, the porosity and permeability also increasing, and the increasing cannot change, this rock's characters are called dilatancy. The technique of 'Loosing Rock by the Dilatancy' is a new stimulation technique which use the rock's character, and use the explosive waves superposition to satisfy the condition of rock's dilatancy to increase the formation permeability near wellbore. The paper studied the dilatancy of different rock and the stimulation principle, calculated the explosive load, designed the technological process, and analyzed the testing result of well stimulation. The result shows the technology is good to increase the yield of oil and gas.