Preparation and Performance Evaluation of High-Temperature Polymer Nano-Plugging Agents for Water-Based Drilling Fluids Systems Applicable to Unconventional Reservoirs

Polymers, Journal Year: 2025, Volume and Issue: 17(5), P. 588 - 588

Published: Feb. 23, 2025

To address the challenges of micro-fracture development in shale formations, frequent wellbore instability, and limited plugging capability water-based drilling fluids unconventional reservoirs, a nano-plugging agent (NPA) was synthesized using emulsion polymerization. The NPA characterized through thermogravimetric analysis (TGA) transmission electron microscopy (TEM), revealing excellent high-temperature stability spherical or sub-spherical morphology, with particle diameters ranging from approximately 20 to 50 nm. rheological, filtration, properties were systematically evaluated, its sealing mechanism analyzed. results demonstrate that at test temperature 180 °C, optimal concentration fluid base slurry is 1.5%, achieving 60.5% reduction HTHP (high-temperature high-pressure) sand disc filtration loss. Additionally, API loss rates reached 58.1% 50.3%, respectively, highlighting remarkable efficiency under conditions. After treatment, specific surface area pore volume cuttings decreased 9.348 m2/g 0.035 cm3/g, indicating effective plugging. suggests due nanoscale size, can penetrate deep into micro-pores fractures within shale, deep-layer Furthermore, forms physical barrier on surface, effectively suppressing hydration swelling. This study provides valuable insights guidance for addressing instability insufficient performance reservoir operations.

Language: Английский

P(AM-co-AA)/PSt nano-microspheres with releasing polymer chains function for filtration loss reduction in oil-based drilling fluids

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2025, Volume and Issue: unknown, P. 137010 - 137010

Published: April 1, 2025

Language: Английский

Study on the preparation and mechanism of two-dimensional nanomaterials as plugging agents for oil-based drilling fluids

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2024, Volume and Issue: 702, P. 134676 - 134676

Published: July 2, 2024

Language: Английский