Abstract
High temperature would dramatically worsen rheological behaviors and increase filtration loss volumes of drilling fluids. Synthetic polymers with high temperature stability have attracted more and more attention. In this paper, a novel quadripolymer was synthesized using 2-acrylamido-2-methylpropanesulfonic acid (AMPS), acrylamide (AM), sodium styrene sulfonate (SSS), and dimethyl diallyl ammonium chloride (DMDAAC). Firstly, the molecular structure was studied by Fourier transform–infrared spectroscope (FT-IR) and nuclear magnetic resonance (1H-NMR) analysis. It was shown that the synthetic polymer contained all the designed functional groups. Moreover, the effect of temperature and the quadripolymer concentration on the rheological behavior and filtration loss of the bentonite-free drilling fluid were investigated. It was experimentally established that when the adding amount of the quadripolymer was 0.9 wt%, the prepared drilling fluid systems exhibited relatively stable viscosities, and the filtration losses could be controlled effectively after hot rolling aged within 180 °C. Further, it was confirmed that the bentonite-free drilling fluid containing the synthesized quadripolymer had good reservoir protection performance. In conclusion, the synthetic quadripolymer is a promising rheology modifier and a filtrate reducer for the development of the bentonite-free drilling fluid at high temperature.
Highlights
Drilling fluid is indispensable in oil and gas drilling engineering to maintain wellbore stability, carry and transport drilled cuttings, and reduce water loss
It is worth noting that high bentonite content of water-based drilling fluids at high temperatures would give rise to serious detrimental effects [8,9,10], for example, deterioration of rheological behavior, increase in filtration volume seeping into formation, formation damages caused by dispersive clay particles
The rheological behavior and filtrates of drilling fluid can be adjusted primarily by adding them with the increase of well depth, one disadvantage of natural polymer is related to the thermal degradation and oxidation under high temperature (150 ◦C) [18,19] which could not control the rheology and filtration loss to meet the demands of the field application
Summary
Drilling fluid is indispensable in oil and gas drilling engineering to maintain wellbore stability, carry and transport drilled cuttings, and reduce water loss. The rheological behavior and filtrates of drilling fluid can be adjusted primarily by adding them with the increase of well depth, one disadvantage of natural polymer is related to the thermal degradation and oxidation under high temperature (150 ◦C) [18,19] which could not control the rheology and filtration loss to meet the demands of the field application. Regarding these disadvantages of natural polymer, some researchers were directed to synthetic polymer that could contribute to rheological stability and low fluid loss in water based fluids at HTHP conditions. The reservoir protection performance of the bentonite-free drilling fluid containing the quadripolymer was evaluated experimentally
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