The effect of 1,6-hexamethylenediamine on thermal stability and shale cutting recovery of heavy weight drilling fluids

摘要

The capability of drilling fluid to endure high temperature and stabilize shale cuttings is important characteristics of drilling fluids.In this work,a combination of 1,6-hexamethylenediamine and polyanionic cellulose(PAC)was tested to observe the impact of 1,6-hexamethylenediamine on thermal stability of PAC and its influence on the shale cutting stability of drilling fluid.First,rheological parameters and filtration control were examined at four different temperatures(325 °F,350 °F,375 °F,and 400 °F).Then,the cutting disintegration test was performed at 250 °F to evaluate the effect of 1,6-hexamethylenediamine on shale cutting stability.Experimental results showed that adding 1,6-hexamethylenediamine to drilling fluids effectively increases the thermal stability of the rheological parameters of drilling fluids such as apparent viscosity,plastic viscosity,yield point,and gel strength up to 350 °F.It was also concluded that when 1,6-hexamethylenediamine is added to drilling fluid,the amount of fluid loss is in acceptable range up to 375 °F.Finally,the results indicated that 1,6-hexamethylenediamine significantly increases the shale cutting recovery.