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Optimizing hematite filter cake treatment using reducing agents.

Osama Siddig1, Salaheldin Elkatatny2, Saad Alafnan1

  • 1Department of Petroleum Engineering, King Fahd University of Petroleum and Minerals, 31261, Dhahran, Saudi Arabia.

Scientific Reports
|May 24, 2024
PubMed
Summary

This study found that a composite solution of ferrous chloride and hydrochloric acid effectively removes hematite filter cakes, enhancing oil and gas well productivity. The treatment improves core permeability and porosity with reduced corrosion.

Keywords:
Drilling fluidFerrous chlorideFilter cake removalHematiteHydrochloric acidReducing agent

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Area of Science:

  • Petroleum Engineering
  • Materials Science
  • Corrosion Engineering

Background:

  • Filter cake formation is vital for wellbore stability during drilling.
  • Efficient filter cake removal is critical for restoring reservoir productivity post-drilling.
  • Hematite-based filter cakes present unique solubility and removal challenges.

Purpose of the Study:

  • To investigate factors affecting hematite filter cake solubility and removal.
  • To identify optimal reducing agents and conditions for filter cake dissolution.
  • To evaluate the impact of the treatment on core porosity and permeability.

Main Methods:

  • Systematic examination of reducing agent types and concentrations.
  • Assessment of temperature, particle size, and treatment duration effects.
  • Utilizing Nuclear Magnetic Resonance (NMR) for porosity analysis.

Main Results:

  • Ferrous chloride identified as the optimal reducing agent for hematite solubility.
  • A composite solution (10 wt.% ferrous chloride, 6 wt.% hydrochloric acid) achieved ~99% removal efficiency.
  • NMR confirmed restoration of core porosity and significant permeability enhancement.
  • The composite solution demonstrated a lower corrosion rate compared to concentrated hydrochloric acid.

Conclusions:

  • The developed composite solution offers an efficient and environmentally conscious method for hematite filter cake removal.
  • This approach balances operational efficiency with reduced corrosion and environmental impact.
  • Findings provide valuable insights for optimizing post-drilling operations and enhancing well productivity in the oil and gas industry.