Volume 39 Issue 6
Nov.  2022
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SHI Yang, XU Ke, ZOU Cunhu, et al.Study on aggregation morphology and resistance reducing properties of drag reducing agents[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：776-786 doi: 10.12358/j.issn.1001-5620.2022.06.017
Citation: SHI Yang, XU Ke, ZOU Cunhu, et al.Study on aggregation morphology and resistance reducing properties of drag reducing agents[J]. Drilling Fluid & Completion Fluid，2022, 39（6）：776-786 doi: 10.12358/j.issn.1001-5620.2022.06.017
shu

Study on Aggregation Morphology and Resistance Reducing Properties of Drag Reducing Agents

doi: 10.12358/j.issn.1001-5620.2022.06.017
  • 1.

    China Petroleum Exploration and Development Research Institute, Beijing, 100083

  • 2.

    School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu， Sichuan 610500

  • 3.

    State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering (Southwest Petroleum University), Chengdu，Sichuan 610500

  • 4.

    Petro China Southwest Oil & Gasfield Company, Chengdu，Sichuan 610051

  • Received Date: 2022-08-15
  • Rev Recd Date: 2022-10-08
  • Publish Date: 2022-11-30
    Abstract
  • In order to clarify the micro control mechanism of the macro drag reduction performance of slick-water drag reducer, a large number of micro characterization of the aggregate structure formed by different types of polymer drag reducing agents were carried out by environmental scanning electron microscope. Combined with the test of the drag reduction performance of the system, the micro mechanism of the effect of concentration on the drag reduction performance of different drag reducing agents systems was revealed from the level of polymer molecular aggregation structure. It was found that the slick-water drag reducer aggregated to form a filament structure at very low concentration. With the increasing concentration of the resistance reducer, these filament structures gradually entangled and connected to form a skeleton, and finally form a multi-level "spider net" aggregate network structure. At the same time, the network structure formed by different types of slick water resistance reducer had its own characteristics. Among them, emulsion and suspension type drag reducing agents had the most complete network structures, while powder type drag reducing agents had uneven distribution of aggregated network structures and low network strength due to slow dissolution speed. At low concentration, the average mesh wall thickness of the network structure formed by the three drag reducing agents was about 0.1-0.3 μm. With the increase of the concentration of drag reducing agents, the mesh shape of the system gradually changed from irregular to polygonal. Some drag reducing agents can form a circular network support structure with high strength and good stability. The mesh size decreased and the mesh wall thickness increased. When the concentration of drag reducing agents increased to 0.05%, the mesh wall thickness can reach 0.3-0.9 μm. The strength of network structure had been significantly improved. The aggregate network structure formed by the slick-water drag reducer will have an important impact on the resistance reducing performance of the system. The addition of the resistance reducing agent and the resistance reducing performance of the system did not show a simple linear relationship. Only an appropriate size aggregate network structure formed at a suitable concentration can closely interact with the water molecules in the system, stabilize the solution flow state, reduce the turbulence pulsation, and reduce the energy dissipation in the turbulent flow process, Finally, the effect of high-efficiency resistance reduction was realized.

     

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