Development of nano-composite plugging agent for drilling fluid
The number of deep wells drilled by PetroChina Offshore Engineering Company is increasing year by year.Faced with complex drilling conditions such as ultra-long drilling section plugging and high downhole temperature,higher requirements are put forward for drilling fluid technology.To effectively improve the plugging and anti-sloughing characteristics of the drilling fluid system currently used in Bohai and other blocks,a polymer nano plugging agent is developed through polymer molecule structure design,structural-activity relationship study,and polymerization process optimization.The plugging agent developed can effectively strengthen the plugging of micro-pores and micro-fractures,improve internal inhibition,and reduce the extension of micro-fractures and micro-fissures caused by the formation intrusion of drilling fluid due to pressure difference to reduce the incidence of complex accidents such as wellbore instability and tripping resistance.The indoor evaluation results of this plugging agent show that it is a kind of high-temperature resistant plugging material with a single dose temperature resistance of 200℃and salt resistance at the density of 20%NaCl.The agent's performance is better than the existing product LPF.Besides,the agent is compatible with organic salt drilling fluid and its application potential is ideal.
plugging and anti-sloughingtemperature resistancesalt resistancepolymer nano plugging
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