压裂缝对低渗致密凝析气藏单井干气吞吐效果的影响

Effect of fracture on dry gas huff and puff in low permeability condensate gas reservoir

汪伟琦¹ 熊钰¹ 金瑾² 罗炫³ 彭国奇³

西南石油大学石油与天然气工程学院，四川 成都 610500 中国石油川庆钻探有限公司，四川 遂宁 629000 中国石油西南油气田分公司蜀南气矿，四川 泸州 646001

针对低渗致密凝析气藏反凝析污染的问题，通常采用CO2吞吐注气技术来解决，而注烃类气解决反凝析污染的成果很少。文中以安岳须二气藏岳101井为对象，在考虑压裂缝的基础上，采用数值模拟方法，以注干气吞吐开发前后凝析油和天然气的采出程度为标准，研究了裂缝长度、宽度、高度和条数对注气吞吐效果的影响。结果表明：相对于长裂缝，近井区域若存在微裂缝，可以提高凝析油和天然气的产量；裂缝宽度达到5 cm以上时，注入干气的效果更好；裂缝高度对干气吞吐效果的影响较小；在相同的裂缝长度下，共轭缝的干气吞吐效果较差。研究成果对类似凝析气藏开发具有指导作用。

Carbon dioxide gas injection technique is usually used to solve the problem of retrograde condensate pollution. The results of hydrocarbon gas injection to solve the anti-condensate pollution are very few. In this paper, solving the problem of anti-condensate pollution was studied through the consideration of the pressure crack. Based on the numerical simulation of Yue 101 well, the stimulation before and after the development of condensate oil and gas was studied by the crack length, crack width, height and crack numbers. The results show that comparing with long cracks, micro cracks of the near wellbore area can improve the stimulation; the effect is much better when the crack width is more than 5 cm; the effect of fracture height on stimulation is small; for the same fracture length, the effect of orthogonal fracture is least effective. The research results have the guiding function to the development of condensate gas reservoirs.

10.6056/dkyqt201602017