Effect of Nanosilica on Microfoam Drilling Fluid Systems
[Purposes]Micro-foam drilling fluid is a thermodynamically unstable system.In the complex formation environment,the stability of drilling fluid will decrease,resulting in the limited use of micro-foam drilling fluid.In order to stabilize the micro-foam drilling fluid,foam stabilizers are usually used to enhance the stability of the foam.With the in-depth study of nanoparticles,it has been found that nano-silica particles have the effect of stabilizing foam.In this study,nano-silica particles were studied by ex-periments.[Methods]Firstly,the effect of nano-silica on foam stability was verified by foam half-life and foaming amount.Secondly,nano-silica was added to micro-foam drilling fluid to study the effect of nano-silica on the performance of micro-foam drilling fluid.[Findings]The results showed that nano-silica could greatly enhance the stability of micro-foam.Compared with the surfactant solution without nano-silica,the half-life of nano-silica increased by 60 min.After adding nano-silica to the micro-foam drilling fluid,the stability of the drilling fluid increases,the rheology is good,the viscosity in-creases,and the water loss decreases.[Conclusions]Nano-silica has a significant effect on enhancing foam stability,so applying it to micro-foam drilling fluid can effectively improve the stability of high drilling fluid and reduce the water loss of drilling fluid,thus exerting the good performance of drilling fluid.In the future,nano-silica can be used instead of drilling fluid materials,which can effectively re-duce the cost of drilling fluid.
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