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Filtration00:53

Filtration

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Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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Modified Starch as a Filter Controller in Water-Based Drilling Fluids.

Diana Soto1, Orietta León1, José Urdaneta1

  • 1Laboratorio de Polímeros y Reacciones, Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad del Zulia, Sector Grano de Oro, Maracaibo 4011, Venezuela.

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A novel itaconic acid graft copolymer improved water-based drilling fluid performance. This starch-based filter control agent enhanced high-pressure, high-temperature filtration by 38%.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Petroleum Engineering

Background:

  • Drilling fluids require effective filtration control agents.
  • Native corn starch (NCS) and commercial starches have limitations.
  • Graft copolymers offer potential for enhanced performance.

Purpose of the Study:

  • To evaluate an itaconic acid (IA) graft copolymer on native corn starch (NCS) as a filter control agent in water-based drilling fluids (WBDFs).
  • To synthesize and characterize the S-g-IA_APS copolymer.
  • To assess its performance under various conditions, including high pressure and temperature.

Main Methods:

  • Radical dispersion polymerization was used to synthesize the S-g-IA_APS copolymer.
  • Synthesized starch modification was verified using FTIR, TGA, and SEM.
  • WBDFs were formulated with NCS, S-g-IA_APS, and commercial starch (CPS) to evaluate fluid loss.
  • Physico-chemical, rheological, and filtering properties (API, HPHT) were assessed.

Main Results:

  • The S-g-IA_APS copolymer demonstrated superior filtration control compared to NCS and CPS.
  • Filtration behavior under high pressure and high temperature (HPHT) improved by 38% with S-g-IA_APS.
  • The copolymer showed good resistance to aging and contamination from cement and salt.

Conclusions:

  • Itaconic acid graft copolymer on native corn starch is an effective filter control agent for WBDFs.
  • S-g-IA_APS enhances fluid loss control, especially under demanding HPHT conditions.
  • This modified starch offers a promising alternative for improving drilling fluid performance.