Volume 37 Issue 4
Aug.  2020
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ZOU Jian, HUANG Liping, ZHAO Peng, YANG Miao, GAO Shang. Analysis of the Content of Solid Suspended Matter in Acid Fracturing Flowback Fluids from Oil Wells in Bohai Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(4): 536-540. doi: 10.3969/j.issn.1001-5620.2020.04.022
Citation: ZOU Jian, HUANG Liping, ZHAO Peng, YANG Miao, GAO Shang. Analysis of the Content of Solid Suspended Matter in Acid Fracturing Flowback Fluids from Oil Wells in Bohai Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(4): 536-540. doi: 10.3969/j.issn.1001-5620.2020.04.022

Analysis of the Content of Solid Suspended Matter in Acid Fracturing Flowback Fluids from Oil Wells in Bohai Oilfield

doi: 10.3969/j.issn.1001-5620.2020.04.022
  • Received Date: 2020-04-20
  • Publish Date: 2020-08-28
  • Acid fracturing flowback fluids produced in Bohai oilfield, after simple treatment, were reinjected into the formation. The fracturing flowback fluids always caused the injectors to be blocked because of the existence of solid suspended matter in the fracturing flowback fluids. Laboratory experiments were conducted for the suspended solid matter on three fracturing flowback fluid samples taken from oil wells in Bohai oilfield. The effect of pH on the content of suspended solid matter in the acid fracturing flowback fluids was analyzed by changing the pH value of the fracturing fluids. The experimental results showed that the content of the suspended solid matter in fracturing flowback fluids from different wells and the content of suspended solid matter in the fracturing flowback fluid from a single well in different time of flowback are quite different. pH value plays an important role in the content of the suspended solid matter. Large amount of Fe(OH)3 precipitate is produced in acid fracturing fluid neutralized with bases. Dynamic displacing test through sandpack tube showed that de-oiled acid fracturing flowback fluid with pH 1 – 2 does not cause obvious block in the sandpack tube. It is thus understood that in field operation, the acid fracturing flowback fluid should not be neutralized with bases. If HCl is used to reduce the pH value of the fracturing flowback fluid, the content of the suspended solid matter in the fracturing fluid can be effectively decreased, hence reducing the risk of near-wellbore blocking in injectors.

     

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