射孔新技术在川西地区的应用

在川西地区开展的直井定方位射孔、多脉冲复合射孔等射孔新技术.定方位射孔利用偶极声波测井各向异性处理结果和地层倾角测井的双井径资料估算地层应力方向,依据压裂资料对区域地应力进行评价.多脉冲复合射孔器采用三级增效火药,一次施工完成射孔和高能气体压裂2道工序.其突破了常规聚能射孔的局限性,有效降低了致密砂岩地层破裂压力,克服钻固井污染和射孔压实污染,沟通地层原生裂缝.对具有岩性致密、裂缝控气和高地层破压地质特征的川西中深层气藏的勘探开发有明显的作用.阐述了上述射孔新技术的原理,并对其应用情况进行了介绍.

Application of New Perforation Technology in West Sichuan Basin

New perforation technologies applied in west Sichuan basin, such as oriented perforation in vertical well and multi-pulse composite perforation, overcome some limitations in conventional shaped charge perforation. The oriented perforation, a new tubing conveyed perforation, chooses a favorable orientation to shoot according to trends of formation stress, fault and fracture deduced from dipole acoustic log and stratigraphic dip log. The multi-pulse composite perforation technology uses three-stage effect-extended powder to complete two working procedure, i.e. perforation and high energy gas fracture, in one operation, and sends fracture props into formation fracture along with the detonating gas. The new perforation technologies reduce the fracture pressure of tight sand formation, overcome pollution in drilling, cementing and perforating, connect original fractures of formation, and get obvious effect in exploitation of middle-deep gas in west Sichuan basin where is characteristic of tight rock, high fracture pressure of formation and fractured gas reservoir. The principles of the new perforation technologies are described, and its applications are introduced.