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Enhancing drilling mud performance through CMITS-modified formulations: rheological insights and performance
Imtiaz Ali1,2, Maqsood Ahmad3, Syahrir Ridha4
1Department of Petroleum Engineering, Universiti Teknologi PETRONAS Seri Iskandar 32610 Perak Malaysia imtiaz_17003333@utp.edu.my.
RSC Advances
|November 29, 2023
Summary
Dually modified tapioca starch (CMITS) enhances deep well drilling fluid performance under high temperature and salt conditions. Optimized CMITS improves rheology and borehole cleaning, offering a stable alternative to conventional additives.
Area of Science:
- Materials Science
- Petroleum Engineering
- Polymer Chemistry
Background:
- Deep well drilling faces challenges with conventional mud additives degrading at high temperatures and salinity.
- Biomaterials offer potential solutions, but dually modified tapioca starch in bentonite-free systems is under-explored.
Purpose of the Study:
- To evaluate the performance of dually modified carboxymethyl irradiated tapioca starch (CMITS) in drilling muds under harsh conditions.
- To assess CMITS's impact on mud rheology, thermal stability, and salt resistance.
Main Methods:
- Central composite design approach was used to optimize CMITS concentration and degree of substitution (DS).
- Mud rheology, thermal stability, and salt resistance were evaluated under simulated deep well conditions.
- Empirical models were developed to predict performance based on DS and CMITS concentration.
Main Results:
- Higher DS (0.66) and CMITS concentration (8 ppb) improved plastic viscosity (PV), yield point (YP), and gel strength (GS).
- Increased salt and temperature negatively impacted rheological properties, highlighting the complex interplay of factors.
- Developed empirical models indicated enhanced rheology at elevated temperatures, aligning with American Petroleum Institute (API) ranges.
Conclusions:
- Dually modified CMITS demonstrates significant potential as a high-performance additive in bentonite-free drilling muds.
- Optimized CMITS exhibits non-Newtonian behavior and improved cuttings transportation, crucial for effective borehole cleaning.
- CMITS offers a promising, stable alternative for deep well drilling fluids facing challenging thermal and saline environments.
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