Volume 36 Issue 3
Jun.  2019
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2019  >  36(3): 293-297
GUO Yongbin, YAN Bangchuan, HUANG Yi, LI Lei, JIANG Guancheng, DENG Zhengqiang. Development and Evaluation of a High Temperature Gelling and Degradable Polymer Lost Circulation Material[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(3): 293-297. doi: 10.3969/j.issn.1001-5620.2019.03.005
Citation: GUO Yongbin, YAN Bangchuan, HUANG Yi, LI Lei, JIANG Guancheng, DENG Zhengqiang. Development and Evaluation of a High Temperature Gelling and Degradable Polymer Lost Circulation Material[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(3): 293-297. doi: 10.3969/j.issn.1001-5620.2019.03.005
shu

Development and Evaluation of a High Temperature Gelling and Degradable Polymer Lost Circulation Material

doi: 10.3969/j.issn.1001-5620.2019.03.005

  • 1. Zhanjiang Branch of CNOOC, Zhanjiang, Guangdong 524057;

  • 2. China University of Petroleum, Beijing 102200

  • Received Date: 2019-02-26
  • Publish Date: 2019-06-30
    Abstract
  • A polymerized modified gelatin crosslinking agent DGCL is developed through quaternization of gelatin with methacrylic anhydride. An initiator is successfully wrapped in ethylene vinyl acetate (EVA) particles based on the thermoplasticity of EVA to realize slow release of initiator at elevated temperatures. A high temperature degradable polymer gelling lost circulation material (LCM) P(AM-DGCL) was developed using acrylamide and a self-made crosslinking agent DGCL. The initiator DGCL was characterized with NMR and the mechanical behavior, plugging capacity and gel-breaking property of the gelling LCM tested. It was found that the gelation time of P(AM-DGCL) decreases with increase in the concentration of the initiator capsules and increase in temperature. The gelation time can be controlled within 2 - 13 h at temperature of 150℃. P(AM-DGCL) has excellent mechanical property; the percent elongation at break is 1,279% and the tensile strength is 0.0425 MPa. Since the crosslinking agent DGCL itself has gel-breaking property, the 16 h percent gel-breaking of P(AM-DGCL) is at least 95% at the action of high temperature and gel breaker, ensuring the flowback of a plugged reservoir because of lost circulation.

     

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