Volume 33 Issue 6
Nov.  2016
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FU Meilong, HU Zewen, HUANG Qian, TANG Fang. Key FactorsAffecting Damage by Fracturing Fluidsto Jiannan Tight Sandstone Gas Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 116-120. doi: 10.3969/j.issn.1001-5620.2016.06.021
Citation: FU Meilong, HU Zewen, HUANG Qian, TANG Fang. Key FactorsAffecting Damage by Fracturing Fluidsto Jiannan Tight Sandstone Gas Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 116-120. doi: 10.3969/j.issn.1001-5620.2016.06.021

Key FactorsAffecting Damage by Fracturing Fluidsto Jiannan Tight Sandstone Gas Reservoir

doi: 10.3969/j.issn.1001-5620.2016.06.021
  • Received Date: 2016-07-25
  • Publish Date: 2016-11-30
  • Carboxymethyl hydroxypropyl guar gum fracturing fluid, an oligomer fracturing fluid and hydroxypropyl guar gum fracturing fluid are used in fracturing the tight sandstone gas reservoirs in Jian'nan block. In recent laboratory experiments, the viscosity, surface tension and residue of the three fracturing fluids after gel-breaking were measured. It was found that there were some differences in the properties of these three fracturing fluids after gel breaking. The measurement of core damage has shown that the ratio of cores' water block damage (65%-80%) was far greater than the ratio of cores' matrix damage (5%-15%), indicating that water block damage was the main damage to reservoir permeability. The ratio of matrix damage and the ratio of water block damage are not only related to the properties of fracturing fluid, they are also related to core permeability and lithology. Through decomposition experiment, it was understood that the amount of residue of fracturing fluid was the key factor affecting matrix damage, and the core permeability was the key factor affecting water block damage. Experiment on water block removal has shown that cores with severe water block damage can have permeability increases by more than 70% after removing waterblock, indicating that the measures of removing water block did work.

     

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