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自2004年中期定点压裂技术问世以来,在澳大利亚的Cooper盆地已采用该技术开展作业140余次。定点压裂技术是通过连续油管泵入具有磨蚀作用的液体,通过喷嘴的作用达到射孔的目的,最后通过连续油管和套管间的环空泵入压裂液进行压裂。多段压裂时层段之间采用砂塞(推荐)或复合桥塞进行封隔。Cooper盆地的地层特征较为复杂,其岩石强度大[砂岩/页岩的平均模量达(27.6～34.5)×106MPa],靠近煤层,地层温度高(121～204℃),破裂梯度常高于1.0psi/ft。在对该地层的所有改造措施中,出现脱砂的频率高达40%,因此,处理这些问题时积累了经验。
Since the advent of fixed-point fracturing technology in mid-2004, over 140 operations have been carried out in Australia’s Cooper Basin. The fixed-point fracturing technology is to pump the abrasive liquid through the coiled tubing to achieve the purpose of perforation through the nozzle. Finally, the fracturing fluid is pumped into the fracturing fluid through the annulus between the coiled tubing and the casing. Sandstone plug (recommended) or composite bridge plug between layers during multi-stage fracturing. The stratigraphic features of the Cooper Basin are complex. The rock strength is large (average modulus of sandstone / shale is (27.6 ~ 34.5) × 106MPa], close to the coal seam. The strata temperature is high (121 ~ 204 ℃) and the fracture gradient is always higher than 1.0 psi / ft. Sand removal occurred at up to 40% of all retrofit measures to this formation, and so experience has been gained in dealing with these issues.