Volume 36 Issue 5
Oct.  2019
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NIE Shuaishuai, ZHENG Lihui, MENG Shangzhi, WEI Panfeng, ZHANG He, SUN Hao. Control the Crack Morphology of Hydraulic Fracture by Fuzzy-ball Fluid in Coal Seam[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 639-645. doi: 10.3969/j.issn.1001-5620.2019.05.020
Citation: NIE Shuaishuai, ZHENG Lihui, MENG Shangzhi, WEI Panfeng, ZHANG He, SUN Hao. Control the Crack Morphology of Hydraulic Fracture by Fuzzy-ball Fluid in Coal Seam[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 639-645. doi: 10.3969/j.issn.1001-5620.2019.05.020
shu

Control the Crack Morphology of Hydraulic Fracture by Fuzzy-ball Fluid in Coal Seam

doi: 10.3969/j.issn.1001-5620.2019.05.020

  • 1. College of Petroleum Engineering, China University of Petroleum, Beijing, Beijing 102249;

  • 2. School of Petroleum Engineering, Chengde Petroleum College, Chengde, Hebei 067000;

  • 3. China United Coalbed Methane Corp., Ltd., Beijing 100011

  • Received Date: 2019-05-20
  • Publish Date: 2019-10-30
    Abstract
  • The direction of hydraulic fractures in the coal seam is diverted along the direction of cutting and natural fractures, the crack morphology of hydraulic fracture is irregular and elongated. Using Fuzzy-ball temporary plugging natural cracks to form regular cracks. Laboratory tests show that the settlement rate of φ0.9 mm ceramsite in Fuzzy-ball fluid is 0.003 cm/s, meeting the requirements of carrying sand; The pressure capacity of the crack plugged with Fuzzy-ball is 18 MPa, able to prevent hydraulic fractures extending in the direction of cleat or natural fractures. Fuzzy-bal fluid damage coal rock permeability recovery value is 86%, satisfying gas production requirements. Field preparation apparent Fuzzy-ball fluid 520 m3. Separate Shanxi and Taiyuan coal seams by sand for stratified fracturing. During the pumping process of sand carrying liquid, the pump pressure is stable at 14.64-15.99 MPa, indicating that there is no blockage and diversion in the process of hydraulic fracture extension. The simulation results show that the fracture length and height of Taiyuan Formation are 155.7 m and 41.3 m respectively, and the fracture length and height of Shanxi coal seams are 163.9 m and 47.5 m respectively. Therefore, Fuzzy-ball fluid can be used to produce a long crack in coal seam, solving the problem of unsatisfactory hydraulic fracturing effect in coal seam.

     

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