Volume 38 Issue 6
Nov.  2021
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KONG Yong.Synthesis and application of a temperature sensitive deformable plugging agent[J]. Drilling Fluid & Completion Fluid,2021, 38(6):677-683 doi: 10.12358/j.issn.1001-5620.2021.06.003
Citation: KONG Yong.Synthesis and application of a temperature sensitive deformable plugging agent[J]. Drilling Fluid & Completion Fluid,2021, 38(6):677-683 doi: 10.12358/j.issn.1001-5620.2021.06.003

Synthesis and Application of a Temperature Sensitive Deformable Plugging Agent

doi: 10.12358/j.issn.1001-5620.2021.06.003
  • Received Date: 2021-07-18
  • Accepted Date: 2021-04-18
  • Publish Date: 2021-11-30
  • Molecular structure design of temperature-sensitive deformable lost circulation materials (LCMs) was conducted in an effort to find a way of overcoming the problems existed in the current LCMs which can only be used in too narrow a temperature range. Based on the technical clue of directional adsorption of LCMs on the formations via deformation of the LCMs under the influence of formation temperature, a temperature-sensitive deformable LCM named SMSHIELD-2 was successfully developed through optimized design of molecular chain, deformability and dispersibility. The SMSHIELD-2 can be used in temperatures from 100 ℃ to 150 ℃ and the temperature range in which the SMSHIELD-2 can perform effectively is gradually broadened using induced intramolecular crosslinking reaction. Molecular structure characterization and performance evaluation of SMSHIELD-2 with IR spectrometry, NMR and pressure transfer tests show that SMSHIELD-2 functions properly in a wide temperature range between 100 ℃ and 150 ℃. SMSHIELD-2 has good compatibility with other additives. It is able to effectively seal off microfractures in hard brittle shales and to improve the plugging and anti-collapse performance of drilling fluids. SMSHIELD-2 was used in drilling the complex hole section of the well X1 in Shunbei block in Xinjiang. By plugging the primary pores and micro-fractures in the formations with SMSHIELD-2, the well was successfully drilled, and two new engineering records was made.

     

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