Banca de QUALIFICAÇÃO: JOAO PEDRO GONCALVES DE SOUZA SOARES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JOAO PEDRO GONCALVES DE SOUZA SOARES
DATE: 22/12/2025
TIME: 09:30
LOCAL: Remoto
TITLE:

Aqueous Drilling Fluid Containing a Metal-Organic Additive to Enhance Performance Under HPHT Conditions

KEY WORDS:

ZIF-67, Filtrate Controller, Rheology, Oil Wells

PAGES: 70
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SUMMARY:

Zeolitic Imidazolate Frameworks (ZIFs) are metal-organic structures composed of transition metals and imidazole-based organic ligands. ZIF-67 has recently been applied in drilling fluids for oil wells; however, its use under severe high-pressure and high-temperature (HPHT) conditions has not yet been explored. Therefore, the aim of this study was to incorporate ZIF-67 particles into aqueous drilling fluid formulations and evaluate their potential as filtrate-reducing agents and rheology modifiers under HPHT conditions. ZIF-67 was synthesized by mixing 2-methylimidazole and cobalt nitrate hexahydrate in deionized water. The X-ray diffraction pattern confirmed the phase purity (CCDC 671073), and the FTIR spectrum revealed the main vibrational modes of the structure, with emphasis on the Co–N coordination bond. The BET surface area was calculated to be 608.1 m²/g, and SEM images showed a dodecahedral morphology for the ZIF-67 particles, with a range of particle sizes (1.534 ± 0.537 μm). Concentrations of 0.10%, 0.25%, and 0.50% ZIF-67 were evaluated, along with the base fluid (without ZIF-67). Rheological tests under API (American Petroleum Institute) conditions showed that the formulated fluids exhibited behavior described by the Herschel–Bulkley model (R² > 0.9), with characteristic shear-thinning behavior (n < 1). Under HPHT conditions, the fluids containing ZIF-67 were able to withstand pressures up to 5700 psi and temperatures of 195 °F while maintaining their non-Newtonian rheological properties, which are suitable for drilling operations.
All fluids were also evaluated using filtration tests performed in API and HPHT cells, according to the API 13B-1 standard. Concentrations of 0.10% and 0.25% resulted in reduced filtrate volumes, with the best performance observed at 0.25% ZIF-67. The fluid containing 0.25% ZIF-67 reduced API filtrate volume from 5.8 to 4.6 mL, while in HPHT tests the filtrate volume decreased from 36.0 to 23.6 mL. Increasing the concentration to 0.50% led to higher fluid loss, which is attributed to pore blockage of the filter medium by ZIF-67 particles, resulting in insufficient packing of the filter cake. Thus, low concentrations of up to 0.25% ZIF-67 effectively reduce filtrate loss and improve the performance of aqueous drilling fluids. This work is pioneering in evaluating ZIF-67 in drilling fluids under HPHT conditions.

 

COMMITTEE MEMBERS:
Presidente - 1979301 - RENATA MARTINS BRAGA
Externo à Instituição - EDSON DE ANDRADE ARAÚJO - ANP
Externa à Instituição - FABÍOLA DIAS DA SILVA CURBELO - UFPB
Externo à Instituição - GLAUCO SOARES BRAGA - IFRN