Enhancing Filter Cake Sealing in Ilmenite-Based Drilling Fluids Using Perlite: Performance Across Varied Densities...

Area of Science:

• Drilling Engineering
• Materials Science
• Petroleum Engineering

Background:

• Drilling fluid formulation is critical for successful wellbore construction.
• High-density ilmenite muds present filtration and stability challenges.
• Effective filtration control is essential to minimize formation damage.

Purpose of the Study:

• To evaluate perlite as a filtration additive in water-based muds with varying ilmenite densities.
• To assess the impact of perlite on filtration, rheology, and formation damage.
• To determine the effectiveness of perlite at mud densities exceeding 15 pounds per gallon (ppg).

Main Methods:

• Experimental investigation of water-based muds with incremental ilmenite densities (10-17.5 ppg).
• Filtration tests using filter paper, ceramic disks, and core samples.
• Assessment of drilling fluid properties, including rheology and filtration behavior.

Main Results:

• A critical density threshold over 15 ppg showed increased filtration volume and thick filter cakes.
• Perlite addition reduced filtration volume by up to 71% and filter cake thickness by 52% at higher densities.
• Perlite minimized core permeability reduction by up to 70% and porosity decline by 51%, while enhancing mud viscosity and rheology.

Conclusions:

• Perlite is an effective additive for improving filtration and rheological properties of water-based muds at high densities.
• Perlite mitigates formation damage and solid invasion, positively impacting drilling parameters like rate of penetration and wellbore stability.
• Perlite enhances overall drilling fluid performance, contributing to more efficient and successful wellbore construction.