Volume 36 Issue 6
Dec.  2019
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XING Xuesong, XU Lin, FENG Huanzhi, LIU Shujie, XU Mingbiao, CHEN Kan. A Differential Pressure Activated Sealant: Preparation, Sealing Performance and Working Mechanisms[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 789-794. doi: 10.3969/j.issn.1001-5620.2019.06.023
Citation: XING Xuesong, XU Lin, FENG Huanzhi, LIU Shujie, XU Mingbiao, CHEN Kan. A Differential Pressure Activated Sealant: Preparation, Sealing Performance and Working Mechanisms[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 789-794. doi: 10.3969/j.issn.1001-5620.2019.06.023
shu

A Differential Pressure Activated Sealant: Preparation, Sealing Performance and Working Mechanisms

doi: 10.3969/j.issn.1001-5620.2019.06.023

  • 1. Beijing Research Center of CNOOC (China) Co., Ltd, Beijing 100028;

  • 2. College of Petrochemical and Energetic Engineering, Zhejiang Ocean University, Zhoushan, Zhejiang 316022;

  • 3. Hubei Collaborative Innovation Center for Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100;

  • 4. Jingzhou Jiahua Tech. Ltd., Jingzhou, Hubei 434000

  • Received Date: 2019-09-08
  • Publish Date: 2019-12-30
    Abstract
  • Differential pressure activated sealant is a kind of sealant with self-adaptive sealing capacity. The application of this sealant is both easy and cost effective. It can be used to fast repair the integrity of oil and gas well strings. Four-factor four-level orthogonal experiment has been performed in laboratory with raw materials such as carboxylated butadiene-acrylonitrile latex (XNBRL), MgCl2, OP-10, VIS-B, to study the effects of the concentration of the latex, concentration of the activator, agitating time and rest time on the growth of the differential pressure activator particles and the microstructure of the activator. The dynamic sealing performance of the activator was evaluated and the differential pressure activated sealing mechanisms were analyzed. It was found that the morphology of the differential pressure activated sealant particles is regular, having a tiered spatial structure. The particle size of the sealant is less than 400 μm. Factors affecting the growth of the particles are in the following order:rest time > concentration of the latex > concentration of the activator > shearing rate. The sealant prepared can successfully seal a microfracture of 0.5 mm×0.8 mm×10 mm at 50℃ and 7.5 MPa. Based on the morphology of the particles, the molecular aggregation structure and the shear deformation behavior of the aggregated molecules, a physical-chemical coupling structure-activity model has been presented to describe the liquid-solid conversion behavior of sealing fluids under the differential pressure from microfractures. The model preliminarily reveals the selfadaptive reparation mechanisms of the differential pressure activated sealants.

     

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