Volume 33 Issue 5
Sep.  2016
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ZHENG Lihui, CUI Jinbang, NIE Shuaishuai, LIU Bin, FU Yuwei, LI Zongyuan. Temporary Plugging Diverting Test with Fuzzy Ball Fluids in Non-Water Producing Coal Beds in Re-fracturing Well Zheng-X[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 103-108. doi: 10.3969/j.issn.1001-5620.2016.05.022
Citation: ZHENG Lihui, CUI Jinbang, NIE Shuaishuai, LIU Bin, FU Yuwei, LI Zongyuan. Temporary Plugging Diverting Test with Fuzzy Ball Fluids in Non-Water Producing Coal Beds in Re-fracturing Well Zheng-X[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 103-108. doi: 10.3969/j.issn.1001-5620.2016.05.022

Temporary Plugging Diverting Test with Fuzzy Ball Fluids in Non-Water Producing Coal Beds in Re-fracturing Well Zheng-X

doi: 10.3969/j.issn.1001-5620.2016.05.022
  • Received Date: 2016-08-01
  • Publish Date: 2016-09-30
  • Re-fracturing diverting has been planned in the well Zheng-x in Zhengzhuang CBM gas field with fuzzy ball temporary plugging fluid. This job was to be done in an effort to increase the gas production by generating new fractures in the reservoir formations, without disturbing the production of the existing fractures. In laboratory studies, a fuzzy ball fluid was used to temporarily plug the artificial fractures on a 33 mm (diameter) coal plug, then an activated water was used to test the pressure bearing of the temporary plugging; it was 20 MPa, exceeding the fracturing pressure of the formation, which is 18 MPa. The percent recovery of the permeability of the coal plug previously flushed with the fuzzy ball fluid was 85%, satisfying the needs for the production of the existing fractures. In field applications, a fracturing blender truck and a water tank were used for the circulation of the fracturing fluid. A fuzzy ball fluid, with density between 0.94 g/cm3 and 0.98 g/cm3, apparent viscosity between 30 mPa·s and 34 mPa·s, was prepared through a shear funnel. After checking the existence of fractures with activated water, 60 m3 of fuzzy ball fluid was injected into the formation at 3.0-3.5 m3/h. The tubing pressure was stabilized at 12 MPa while stopping pumping for 30 min, indicating that the plugging of existing fractures with the fuzzy ball fluid was successful. The formation was then fractured with activated water when the tubing pressure was increased to 18 MPa. The azimuth of the new fractures was N13°W, as measured with microseism, meaning that 55° of diverting was realized compared with the N42°E azimuth of the existing fractures. A gas production of 200 m3 in 2 h after fracturing was achieved, doubling the gas production rate before the fracturing job. Microseism monitoring and the gas production rates before and after the fracturing job indicated that the fuzzy ball forced the fracturing fluid to divert to generate new fractures, while the production of the existing fractures was not affected. This technology is suitable for the re-fracturing of old CBM wells to generate new fractures, while the production of the existing fractures was not affected. This technology is suitable for the re-fracturing of old CBM wells.

     

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