Volume 36 Issue 6
Dec.  2019
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LIU Wei, ZHU Fanghui, YU Shuzhen, LI Qiongwei, ZHANG Zhenyun, DONG Xiaohuan, LI Mingxing. Development and Application of a Temperature Enhanced Highly Elastic Liquid Gel Temporary Plugging Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 782-788. doi: 10.3969/j.issn.1001-5620.2019.06.022
Citation: LIU Wei, ZHU Fanghui, YU Shuzhen, LI Qiongwei, ZHANG Zhenyun, DONG Xiaohuan, LI Mingxing. Development and Application of a Temperature Enhanced Highly Elastic Liquid Gel Temporary Plugging Agent[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 782-788. doi: 10.3969/j.issn.1001-5620.2019.06.022
shu

Development and Application of a Temperature Enhanced Highly Elastic Liquid Gel Temporary Plugging Agent

doi: 10.3969/j.issn.1001-5620.2019.06.022

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

  • 2. Oil & Gas Technology Research Institute, Changqing Oilfield Company, Xi'an, Shaanxi, 710018

  • Received Date: 2019-09-13
  • Publish Date: 2019-12-30
    Abstract
  • To address mud loss problems in low pressure gas wells, an elastic liquid gel plug EGL-1 has been developed using polyethyleneimine (PEI) as crosslinking agent. EGL-1 is able to remarkably enhance the pressure bearing capacity of formations and completely stop loss of fracturing fluids to minimize formation damage. The basic composition of EGL-1 is:2% SPAM (a high temperature polymer)+(1%-1.6%)PEI+0.02% stabilizer+water. Test and evaluation of EGL-1 showed that the new EGL-1 solution, after being seared at 200 s-1, had apparent viscosity of less than 350 mPa·s, indicating that EGL-1 has good pumpability. Test on the crosslinked EGL-1 showed that it had elastic modulus between 100 Pa and 470 Pa, and viscous modulus between 10 Pa and 60 Pa. The strength of the gel plug increases with temperature. Physical simulation experiment results showed that the compressive strength of the gel plug in fractured cores was at least 9 MPa, and the breakthrough pressure of flowback test was less than 1 MPa. The permeability recovery of the cores tested with the gel plug was 90% and pore plugging caused by the gel plug can be removed naturally. This gel plug has been successfully used in killing a low-pressure gas well penetrating paleo-carbonate formation. The successful application of EGL-1 can be used to kill similar low pressure gas wells with potential of fluid losses.

     

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