Improving the Weak Gel Structure of an Oil-Based Drilling Fluid by Using a Polyamide Wax

Area of Science:

• Materials Science
• Petroleum Engineering
• Chemical Engineering

Background:

• Oil-based drilling fluids (OBDFs) are crucial in oil and gas exploration.
• Common issues with OBDFs include poor cutting transport and low yield point.
• Enhancing OBDF performance is vital for efficient and safe drilling operations.

Purpose of the Study:

• To synthesize and evaluate a novel polyamide wax (TQ-1) for improving OBDFs.
• To investigate the impact of TQ-1 on the stability and rheological properties of water-in-oil emulsions.
• To assess the overall performance enhancement of OBDFs with TQ-1 addition.

Main Methods:

• Synthesis of polyamide wax (TQ-1) from dimeric acid and 1,6-hexanediamine.
• Characterization of TQ-1 using Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA).
• Evaluation of emulsion stability (sedimentation, stability index, electrical stability, particle size) and rheological properties (viscosity, thixotropy).

Main Results:

• TQ-1 exhibited good thermal stability with an initial decomposition temperature of 195 °C.
• Addition of TQ-1 enhanced emulsion stability, increased demulsification voltage, and improved shear thinning and thixotropy.
• TQ-1 significantly improved yield point and gel strength, while reducing the sedimentation factor in OBDFs.

Conclusions:

• Polyamide wax (TQ-1) effectively strengthens the weak gel structure of OBDFs.
• TQ-1 demonstrates excellent thermal stability and compatibility with OBDFs.
• The study confirms TQ-1's potential to overcome key limitations of traditional OBDFs, improving drilling efficiency.