Volume 37 Issue 4
Aug.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(4): 412-420
WANG Zhaohui, CUI Kaixiao, JIANG Guancheng, HUA Zhichao, XU Pengchen, GUO Yufeng, SUN Hao. Development and Evaluation of a Temperature-Sensitive Expandable Lost Circulation Material Made from a Shape Memory Epoxy Polymer[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(4): 412-420. doi: 10.3969/j.issn.1001-5620.2020.04.002
Citation: WANG Zhaohui, CUI Kaixiao, JIANG Guancheng, HUA Zhichao, XU Pengchen, GUO Yufeng, SUN Hao. Development and Evaluation of a Temperature-Sensitive Expandable Lost Circulation Material Made from a Shape Memory Epoxy Polymer[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(4): 412-420. doi: 10.3969/j.issn.1001-5620.2020.04.002
shu

Development and Evaluation of a Temperature-Sensitive Expandable Lost Circulation Material Made from a Shape Memory Epoxy Polymer

doi: 10.3969/j.issn.1001-5620.2020.04.002

  • 1. The Fourth Branch Company of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552;

  • 2. State Key Laboratory of Petroleum Resources and Prospecting, MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249

  • Received Date: 2020-04-15
  • Publish Date: 2020-08-28
    Abstract
  • To eliminate the problems encountered in mud loss control with regular inert particle lost circulation materials (LCM) and water-absorbing gel particles, a shape memory epoxy compound foam was developed with shape memory epoxy as the base material and hollow glass beads added into the epoxy to improve its compressibility. With the epoxy compound foam, an expandable smart temperature-sensitive LCM, SMP-LCM was developed. SMP-LCM can be made to have different response temperatures and expanding ratios. By controlling the concentration of crosslinking agent in the shape memory epoxy, shape memory epoxies of different response temperature ranges between 50 ℃ and 100 ℃ were obtained. By controlling the number of pores in the epoxy, shape memory epoxy foams of different expansion rates (5% - 110%) and the foam particles can be obtained. Laboratory experimental results showed that at the effect of temperature, SMP-LCM can expand very fast, and the expansion rate is not affected by the type medium in which the LCM is dispersed. This makes SMP-LCM very suitable for plugging sand discs and sand beds with big pores and rendering them high pressure bearing capacity. SMP-LCM is a temperature-sensitive expandable LCM, able to enter into the very depth of loss zones with small volume and expand at the effect of the temperature therein. In the loss zones, SMP-LCM, because of its shape memory effect, can produce a restoring stress with which the formation can be strengthened while not be fractured, thereby enhancing the pressure bearing capacity of the weak formations. With these characteristics, SMP-LCM has shown a perfect application prospect.

     

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