Volume 38 Issue 4
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WANG Pengxiang, ZHANG Xiangfeng, ZHANG Dandan.Study and application of a low damaging drag reducing hydrophilic suspension[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：510-516 doi: 10.3969/j.issn.1001-5620.2021.04.018
Citation: WANG Pengxiang, ZHANG Xiangfeng, ZHANG Dandan.Study and application of a low damaging drag reducing hydrophilic suspension[J]. Drilling Fluid & Completion Fluid，2021, 38（4）：510-516 doi: 10.3969/j.issn.1001-5620.2021.04.018
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Study and Application of a Low Damaging Drag Reducing Hydrophilic Suspension

doi: 10.3969/j.issn.1001-5620.2021.04.018
  • 1.

    Downhole Service Company, CNPC Chuanqing Drilling Engineering Company Limited, Chengdu, Sichuan 610051

  • 2.

    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059

  • Received Date: 2021-03-16
    Available Online: 2021-12-06
  • Publish Date: 2021-07-31
    Abstract
  • A new low damaging hydrophilic suspension dissolvable in alcohol solvents was developed to solve the problems encountered in field application of polymer drag reducers such as long time of hydration and low solubility of the drag reducers, and problems encountered in using hydrophobic suspensions such as poor environmental friendliness. Laboratory and field evaluation of the overall performance of the slick water system was performed. The evaluation results show that the best solvent for the suspension is polyethylene glycol 200. When the concentrations of two thixotropic agents PR and CQ2720 were 1.5% respectively, the suspension has the best stability, and the two thixotropic agents have synergistic effect on stabilizing the suspension. When adding 0.5% dispersant MR312 into the suspension, the drag reducing suspension can stand for 30 d without any sedimentation, and the viscosity of the system remained at 177 mPa·s. The drag reducing suspension can be uniformly dispersed into water, and the slick water prepared with the suspension is clear and transparent. The viscosity of the slick water is adjustable and the rate of drag reduction is great than 70%. In the fracturing job performed on the well Yang-101H1-1, the drag reducer was uniformly dispersed into water, without agglomerating. The fracturing fluid became viscosified quickly and was easy to be flowed back, and it also showed significant environment protection effect.

     

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