Development and Evaluation of a Temperature-resistant Tackifier for Water-based Drilling Fluid
In recent years,with the advancement of oil exploration in extended reach wells,deep wells,and ultra-deep water wells,the demand for drilling fluid additives in high-temperature reservoirs has significantly increased.Tackifiers,crucial components for controlling the viscosity of soilless water-based drilling fluids and enhancing their rock-carrying capacity,face formidable challenges in terms of temperature resistance.In this paper,a water-based temperature-resistant tackifier was developed through micelle polymerization by using 2-acrylamide-2-methylpropanesulfonic acid(AMPS),alkenyl caprolactam(NVCL),N-vinylpyrrolidone(NVP),and divinylbenzene(DVB)as raw materials,along with oil-soluble azo initiator.The properties of the tackifier were thoroughly evaluated.The results showed that the 0.9%sample solution exhibited an apparent viscosity of 34 mPa·s and a dynamic-plastic ratio of 0.55 after aging at 160℃,thus demonstrating its effectiveness in increasing viscosity and yield point.The temperature resistance of this agent extended up to 180℃,surpassing that of conventional viscosity-increasing agents and delivering superior viscosity enhancement at elevated temperatures.It also demonstrated saturation-level salt resistance and 1.5%calcium resistance,meeting the stringent requirements for viscosity enhancement and efficient cuttings transport in high-temperature and high-salinity formations during drilling.
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