基于径向井技术的煤储层高效增透工艺研究

Study on high efficient permeability improved technique of coal reservoir based on radial well technology

为获得高效的煤储层增透工艺技术,从而达到显著提高煤层气井气产量的目的,以新型径向井技术为基础,并将其与水力压裂技术高效结合,采用理论分析的方法,对影响径向井压裂增透效果的各因素进行了深入的分析与研究,包括主裂隙方位、地层倾角、径向井施工技术等。同时,通过现场试验对径向井压裂技术的实用性进行了检验,结果表明,基于径向井技术的煤储层高效增透工艺能使不产气井的日产量增加到500 m^3/d,煤层透气性系数提高了3.55倍,从而形成了一套基于径向井技术的煤储层高效增透新工艺,该工艺可以显著提升煤储层的增透效果,提高煤层气井产量。

In order to have a high efficient permeability improved technique and technology of the coal reservoir and to reach a target to obviously improve the production of the coalbed methane well,based on a new radial well technology,in high efficient combination with the hydraulic fracturing technology,the theoretical analysis method was applied to a deep analysis and study on each factor affected to the fracturing and permeability improved effect of the radial well,including the major crack direction,strata inclination,radial well construction technology and others.Meanwhile,with the site test,an inspection was conducted on the practicality of the radial well fracturing technology.The results showed that based on the radial well technology,the high efficient permeability improved technology of the coal reservoir could increase the daily production of the no gas production well to 500 m^3/d and the permeability coefficient of seam was increased by 3. 55 times.Thus,a new set high efficient permeability improved technique of the coal reservoir was formed based on the radial well technology.The new technique could obviously improve the permeability effect of the coal reservoir and could improve the production of the coalbed methane well.