Study on the effect of synergistic action of polymer and bentonite on performance of water-based drilling fluid
In response to the problems of high temperature resistance,high pressure resistance,and poor drilling performance of commonly used water-based drilling fluids.The effects of bentonite and vinyl polymers[polyvinyl pyrrolidone(PVP),partially hydrolyzed polyacrylamide(HPAM)]on the performance of water-based drilling fluids are investigated.Under high temperature and pressure conditions,the filtration and rheological properties of drilling fluid are measured using a filtration system and a rotary viscometer,respectively.The results show that the drilling fluid with high molecular weight PVP has higher viscosity,gel strength and yield stress.In addition,when low molecular weight PVP is added to the drilling fluid,the drilling fluid system is in a dispersed state.Under high temperature and pressure,the rheological parameters of the dispersed system are more stable,and the filtrate volume of the drilling fluid after adding bridging agent is only 12.0 mL,making it a substitute for water-based drilling fluid.
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万方数据
维普
