深层水平井多级复合深穿透定向射孔技术应用研究

Application of Multi-stage Composite Deep Penetration Directional Perforation Technology for Deep Horizontal Wells

深层水平井多级复合深穿透定向射孔技术利用深穿透射孔和定向高能气体压裂技术在油层部位形成沟通孔眼及多个辐射状径向裂缝,以扩大泄油面积和降低生产压降。分析了该技术的原理,根据技术适用性对试验井进行选井选层论证,在此基础上提出了试验井的多级复合深穿透定向射孔设计方案,并从试验准备及施工工艺方面论述了试验井的现场实施情况。试验结果表明,施工过程达到了方案设计要求,试验井的产油量得到了提升,产油量由措施前的0.4 t/d提高到7.2 t/d;含水率有了明显的下降,产液量由措施前的33.4 t/d降到了7.8 t/d。分析认为,该技术成功的关键是射孔压裂深度、方位的控制、选井选层的合理性。该技术的成功应用为老油田剩余油挖潜提供一种经济、高效的途径,具有一定的应用前景。

Deep penetration composite directional perforation technology in horizontal wells applies deep penetra-ting perforation and high energy gas fracturing to form a plurality of radial hole in the reservoir,thereby to enlarge the drai-nage area and decrease production pressure.Such technical principles were analyzed,and based on the technical applicability,tested well was selected.Accordingly,a deep composite directional perforation design plan was proposed on the tes-ted well,and oilfield operation situation of tested well was detailed illuminated from the test preparation to construction techniques.The test results show that construction technology has met the design requirement,oil production of the tested well increases from 0.4 t/d to 7.2 t/d,and water content obviously decreases from 33.4 t/d to 7.8 t/d.By comprehensive analysis,the key factors of deep penetration composite directional perforation in horizontal well are fracturing depth,perforation orientation,well situation and reservoir condition.The successful application of this technology provides an economical and efficient way for producing the remaining oil potential in old oilfields,and it has a good application prospect.