Abstract: The string technique for thick reservoir internal layered fracturing is an optimized and innovative design in the light of high cost for combinative fracturing of thick reservoirs, high requirements on surface equipment, difficulties in fracturing service and poor performance. Based on optimization and creative design of fracturing pipe string, thick reservoir is internally fractured in stages. The layers can be brought under fracturing renovation one by one with the minimum distance among the layers shortened for three meters and more, namely fracturing can be focused on all the layers with different formation stress in the inhomogeneous formation. Field application confirms that layered fracturing of thick reservoir can obviously increase oil production, remarkably improve formation permeability, lower the technical requirements on equipment and difficulties for fracturing service, and significantly reduces oil and gas production cost. This technique was cumulatively used for 242 well/times on the field between 2013 and 2014. The additional crude oil production was accumulated to 110773.7 tons.

Key words: string design, layered fracturing, packer, sand jet sliding sleeve, application

摘要： 厚储层层内分段压裂工艺管柱技术,针对以往厚储层合层压裂改造成本高、地面设备要求高、施工难度高、效果差等不足,通过对压裂管柱优化及创新设计,成功实现了厚储层层内分段压裂改造,可将压裂层段分层改造的层间最小距离缩短到3m及以上,即非均质地层内地层应力高低不同的层段都能得到有针对性的改造。通过现场应用证明,较厚储层合层压裂改造,增油效果更明显,地层渗透率显著提高,降低了配套设备的技术要求,降低了压裂施工难度,大幅节约油气开采成本等特点。2013—2014年吐哈油田累计完成242井次的现场应用,累计增加原油产量110773.7t。

关键词: 管柱设计, 分层压裂, 封隔器, 喷砂滑套, 应用