射孔参数对射孔—砾石充填井表皮系数的影响分析

INFLUENCE OF PERFORATION PARAMETERS ON SKIN FACTOR OF PERFORATION GRAVEL PACK TECHNOLOGY

射孔过程对油、气井的产能影响有利有害,它既能为油气流提供通道,又可对产层造成相当的伤害。如果工艺和射孔参数选择得当,就可以使射孔对产层的伤害最小,否则将适得其反。文章在通过建立射孔—砾石充填井表皮系数计算模型的基础上,分析了射孔—砾石充填井的孔深、孔径、孔密等射孔参数对表皮系数的影响及其程度。应用此模型计算官10井的表皮系数高达13.89,对该井优化了射孔方案,经过实施深部酸化增产作业后,成功地使官10井的产量由原来的709m3/d增加到平均6.0×104m3/d。相对于压力恢复试井解释表皮系数,文中提出的射孔—砾石充填井的表皮系数计算方法具有速度快,精度较好的特点,能有效地模拟出孔深、孔径、孔密等射孔参数对其的影响。

Perforation has advantages and disadvantages for the productivity of oil/gas wells. It can provide the channels for oil/gas flowing but also damage the reservoir. If the process and the parameters of perforation are suitable, the reservoir damage will be minimum, and if not, the damage will be very severe. By establishing the model of skin factor calculating for Perforation Gravel Pack technology, the influence of the perforation parameters such as the depth, diameter and density of perforated holes etc. on the skin factor is analyzed for Perforation Gravel Pack technology. With this model, it is calculated the skin factor of Well Guan 10 which is up to 13.89. By optimizing the perforation program and performing the stimulation of deep acidizing, the production of the well increases from original 709 m3/d to average 60,000 m3/d. Comparing with the method to obtain the skin factor by build up test, the calculating method of skin factor proposed in the article for Perforation Gravel Pack technology has the characteristics of quick velocity and high accuracy. With the method, it can be simulated effectively the influence of the perforation parameters such as the depth, diameter and density of perforated holes etc. on the skin factor.