The re-fracturing of oil well is one of main offensive measures to increase the single well production of stripper well in tight oil reservoir.In order to improve the yield-increasing effect of re-fracturing, it is necessary to optimize the perforation mode and fracture parameter.Taking a tight oil reservoir in Xinjiang Changji Oilfield as an example, the prediction model of re-fracturing was established and the productivity index of stripper well in different perforation mode or fracture half-length or conductivity was studied using the numerical simulation method.The results show that, compared to the mode in old perforation location, the mode in new perforation location is more significant in stimulation effect,and the more new perforation the higher production.The effect of fracture half-length on re-fracturing is next only to fracturing series, The yield increase along with the extend of fracture half-length.Due to the low permeability in tight oil reservoir, the fracture conductivity only slightly affects the reservoir performance.%重复压裂技术是目前致密油藏低产井提高单井产量的主要措施之一.为了提高重复压裂的增产效果,有必要对重复压裂射孔方式及裂缝参数进行优化.文中以新疆昌吉致密油田为例,建立了重复压裂产能预测模型,利用数值模拟方法,研究了低产井在不同射孔方式、裂缝半长及导流能力条件下的产能指标.结果表明,相比于旧射孔压裂方式,在新射孔处压裂的增油效果更加显著,且二次压裂的新射孔段越多,增产效果越好;裂缝半长对新疆致密油重复压裂效果影响仅次于压裂级数,随着裂缝半长的增加,日产油量与累产油量均随之升高;而由于致密储层渗透率过低,裂缝的导流能力的变化对致密油藏的生产动态的影响相对有限.
展开▼
