Extending thermal stability of calcium carbonate pills using sepiolite drilling fluid

Ali Ettehadi, Gursat Altun

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The aim is to investigate the plugging ability of sepiolite clay water base drilling fluids before and after CaCO3 added over a wide range of high permeable zones at high temperature and high pressure conditions, to verify the feasibility of CaCO3 as loss preventer material (LPM) into the sepiolite drilling mud. The rheology and loss tests at 27-204℃ and 2 070 or 6 895 kPa reveal that the sepiolite drilling mud shows good rheology and high solid suspension capability at all temperatures except 149℃, and low loss circulation at high temperature and high pressure. The Permeability Plugging Apparatus (PPA) experiment, in which the 10-90 µm permeable ceramic plate was simulated as formation, shows that the sepiolite drilling mud without CaCO3 can not plug the pores, while the sepiolite drilling mud with CaCO3 can plug the pores quickly and keep the CaCO3 particles suspended even at high temperature (up to 193℃). The PPA experiment results were proved by the analysis using SEM and ideal packing theory.

Original languageEnglish
Pages (from-to)446-455
Number of pages10
JournalShiyou Kantan Yu Kaifa/Petroleum Exploration and Development
Issue number3
Publication statusPublished - 23 Jun 2017

Bibliographical note

Publisher Copyright:
© 2017, The Editorial Board of Petroleum Exploration and Development. All right reserved.


  • Calcium carbonate particle
  • HTHP drilling temperature
  • Loss circulation
  • Plugging performance
  • Sepiolite drilling mud
  • Thermal stability


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