Novel Starch Composite Fluid Loss Additives and Their Applications in Environmentally Friendly Water-Based Drilling Fluids

Abstract

With increasing intensified environmental pressure and a complex drilling environment, developing high-performance fluid loss additives with environmental acceptability is becoming a research focus. Through chemical cross-linking between starch, polyphenols, and lignosulfonate, a polymer SPL was facilely synthesized and it showed good filtration performance in bentonite–water-based drilling fluids (BT-WBDFs). The BT-WBDFs containing 2.0 wt % SPL polymer had a filtration volume of 7.0 mL/30 min at 150 °C. Moreover, SPL can resist the effect of 0.75 wt % CaCl2 and 7.5 wt % NaCl at 150 °C. The polymer SPL contributed to stable bentonite dispersion and kept enough viscosity of BT-WBDFs at high temperatures. The well-dispersed bentonite and SPL formed a thin and compact filter cake, providing effective plugging and shielding effects during the filtration process. Furthermore, a WBDF based on SPL as the main fluid loss additive was prepared and it displayed excellent high-temperature resistance, rheological property, inhibition, and environmentally friendly performance. This set WBDF has promising guidance on the design of high-performance drilling fluids with excellent environmental protection property.

Highly effective utilization of vinyl copolymer as filtrate reducer of water‐bentonite drilling fluid under ultrasonic oscillations

“…The other is that the screening effect of compound salt on negative electric charge of terpolymer and bentonite can weaken the electrostatic repulsion between them and thus enhance adsorbed amount of terpolymer on bentonite. 37,38 However, it is not enough to change the flocculation or aggregation structures in compound salt-water drilling fluid. Hence, compared to the fresh-water drilling fluid, the compound salt-water drilling fluid hold poor clay particle dispersion and mud cake characteristics, regardless of the ultrasonic oscillations.…”

Synthesis of a Low-Molecular-Weight Filtrate Reducer and Its Mechanism for Improving High Temperature Resistance of Water-Based Drilling Fluid Gel System

“…At present, the filtrate reducers commonly used in the petroleum industry are mainly modified natural materials and synthetic polymers. Natural materials [ 11 , 12 , 13 , 14 ] (e.g., starch, cellulose, lignin, and xanthan gum) were the first to receive the attention of researchers due to their wide sources, low price, and environmental friendliness. However, due to the inherent characteristics of natural materials, their applicable temperature is usually below 150 °C, which cannot meet the needs of deep well drilling.…”

Utilization of Eco-Friendly Waste Generated Nanomaterials in Water-Based Drilling Fluids; State of the Art Review

“…To facilitate the extraction of hydrocarbons from the ground, a deep hole is drilled to form a wellbore. The use of drilling fluids is an important factor in the drilling process, and these fluids play many roles, such as to assist in removal of drill cuttings and formation pressure control [ 2 , 3 ]. There are viable chemical additives used in the drilling fluid that have shown the desired features.…”