Volume 39 Issue 4
Jul.  2022
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WANG Ding, CHEN Caizheng, DU Songtao.Low friction cement slurry cementing technology in ultra-long horizontal section of tight gas reservoir[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：488-494 doi: 10.12358/j.issn.1001-5620.2022.04.014
Citation: WANG Ding, CHEN Caizheng, DU Songtao.Low friction cement slurry cementing technology in ultra-long horizontal section of tight gas reservoir[J]. Drilling Fluid & Completion Fluid，2022, 39（4）：488-494 doi: 10.12358/j.issn.1001-5620.2022.04.014
shu

Low Friction Cement Slurry Cementing Technology in Ultra-long Horizontal Section of Tight Gas Reservoir

doi: 10.12358/j.issn.1001-5620.2022.04.014
  • 1.

    CCDC Drilling Engineering Technology Research Institute, Xi'an, Shaanxi 710018

  • 2.

    National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields, Xi'an, Shaanxi 710018

  • Received Date: 2022-03-08
  • Rev Recd Date: 2022-04-21
  • Publish Date: 2022-07-30
    Abstract
  • Cementing of ultra-long horizontal section of Sulige Tight Gas Reservoir in Changqing Oilfield has long open-hole sections, small annulus gaps, high flow friction and pressure loss, high construction pressure, and easy leakage, resulting in poor cementing quality and later annular pressure. A series of complex issues have seriously affected subsequent mining and single well production. Therefore, low friction low density cement slurry and low friction high strength and toughness cement slurry are developed to improve the fluidity of cement slurry and reduce the flow friction pressure consumption, and reduce the construction pressure and the risk of leakage.Low-friction low-density cement slurry adopts hollow glass beads with good pressure resistance as the main reducing material to improve the pressure resistance of the system, and maintain a higher roundness of the structure after entering the well, effectively reducing the friction and pressure loss.Low-friction high-strength and toughness cement slurry is based on conventional cement slurry, introducing solid glass microspheres and composite high-efficiency reinforcing agents to improve the fluidity of the cement slurry and reduce friction pressure loss on the basis of ensuring the mechanical properties of the cement stone. The experimental results show that the Fanning friction coefficient of low-friction and pressure-resistant hollow glass microbead cement slurry is reduced from 0.0593 to 0.0295, which is 50.25% lower than that of conventional low-density cement slurry . The friction coefficient of low friction high strength toughness cement slurry is reduced from 0.07 to 0.0414, 40.86% lower than the conventional high strength toughness cement slurry. The preliminary pilot test shows that the low friction cement slurry can reduce the friction pressure and the construction pressure effectively. The adoption of low-friction cement slurry and the segmented gradient sand carrying design of low-friction high-strength and high-toughness cement slurry helped the cement construction of 5256 m ultra-long horizontal section in tight gas reservoir to be successfully completed, and the cementing quality was qualified, providing strong technical support for the ultra-long horizontal section in Changqing tight gas reservoir.

     

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