Volume 39 Issue 2
Jun.  2022
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2022  >  39(2): 241-247
SHEN Jinwei, YUAN Wenkui, ZHAO Jian, et al.Study on formulating fracturing fluids with used fracturing fluids for tight gas reservoirs [J]. Drilling Fluid & Completion Fluid，2022, 39（2）：241-247 doi: 10.12358/j.issn.1001-5620.2022.02.018
Citation: SHEN Jinwei, YUAN Wenkui, ZHAO Jian, et al.Study on formulating fracturing fluids with used fracturing fluids for tight gas reservoirs [J]. Drilling Fluid & Completion Fluid，2022, 39（2）：241-247 doi: 10.12358/j.issn.1001-5620.2022.02.018
shu

Study on Formulating Fracturing Fluids with Used Fracturing Fluids for Tight Gas Reservoirs

doi: 10.12358/j.issn.1001-5620.2022.02.018

  • China Oilfield Services Ltd., Tianjin 300459

  • Received Date: 2021-10-25
  • Accepted Date: 2021-10-25
  • Rev Recd Date: 2021-11-29
  • Publish Date: 2022-06-23
    Abstract
  • In this paper, the effects of the water from the treatment of the flowback fracturing fluids on the properties of the guar gum fracturing fluid were discussed to solve the problem of the reuse of the water. In high salinity water, guar gum has poor swelling capacity and poor crosslinking performance. To overcome these problems, a salt-resistant guar gum PA-G, a chelating agent PA-CR and a synthesized organoboron crosslinking agent PA-CL were used to formulate a fracturing fluid with water from flowback fracturing fluids. Laboratory experimental results showed that this fracturing fluid is resistant to shearing damage at 90 °C. It has these functionalities such as: 1) the selected salt-resistant guar gum PA-G has high swelling rate and high viscosity; water solution containing 0.3% PA-G has its viscosity developed to 30 mPa·s in 5 min. 2) The high efficiency chelating agent, which was developed with organic base, EDTA, organophosphate and polymer, can effectively chelate calcium and magnesium ions. Using this chelating agent, the pH of a high salinity water containing 1,500 mg/L calcium and magnesium ions can be raised to above 10 without causing precipitation. 3) the organoboron crosslinking agent developed has the property of delaying crosslinking.

     

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