Volume 38 Issue 4
Jul.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(4): 504-509
LIU Fujian, WANG Lixiang, DU Liangjun, et al.Preparation of salt tolerant suspension dispersion polymer system and its application in brine-based variable viscosity slippery water system[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：504-509 doi: 10.12358/j.issn.1001-5620.2021.04.017
Citation: LIU Fujian, WANG Lixiang, DU Liangjun, et al.Preparation of salt tolerant suspension dispersion polymer system and its application in brine-based variable viscosity slippery water system[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：504-509 doi: 10.12358/j.issn.1001-5620.2021.04.017
shu

Preparation of Salt Tolerant Suspension Dispersion Polymer System and its Application in Brine-based Variable Viscosity Slippery Water System

doi: 10.12358/j.issn.1001-5620.2021.04.017
  • 1.

    Fracturing Company, Great Wall Drilling Co. Ltd., CNPC, Panjin, Liaoning 124010

  • 2.

    Sichuan Shenhe New Material Technology Co.Ltd Sichuan, Chengdu, Sichuan 610500

  • Received Date: 2021-03-20
  • Publish Date: 2021-07-31
    Abstract
  • In this paper, the zwitterionic polymer molecule P-DHZ containing double tailed hydrophobic monomer was developed by aqueous solution polymerization system. Its viscosity average molecular weight is more than 10 million. It owns excellent salt resistance, drag reduction and gelling properties. It can be used as a drag reducer or thickener for shale gas hydraulic fracturing fluid, and can be directly prepared with highly mineralized backflow fluid. Its salt resistance can reach 60 000 mg/L. In order to meet the process requirements of continuous mixing in shale gas fracturing field, P-DHZ powder was prepared and dispersed in hydrocarbon continuous phase to form a stable suspension system. The best powder size, dispersant, diverting agent and hydrocarbon continuous phase were selected to prepare a suspension system for continuous mixing in field. The proportion of powder accounted for 45% of the suspension system, and it can be solved in high salinity back-flow fluid to prepare fracturing fluid without fresh water resource. The maximum drag reduction rate is more than 75%, and the dissolution time is less than 30 seconds. The viscosity can be changed in real time by adjusting the concentration, and the slick-water system can be quickly transformed into the glue system.

     

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