Polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent and preparation method thereof

Abstract

The invention discloses a polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent and a preparation method thereof. According to the preparation method, in the presence of nano-silica, a polymer-base nanometer composite material with amphiphilic block hydrophobic associating polymer wrapping inorganic nano-silica is successfully synthesized by virtue of a micellar emulsion polymerization method and combines the rigidity and the heat stability of the inorganic nano-silica and the characteristics of the amphiphilic block hydrophobic associating polymer together, and the temperature resistance, the salt tolerance and the thickening property of the polymer are obviously improved by virtue of the polymer-base nanometer composite material on the basis of the existing good performances of the amphiphilic block hydrophobic associating polymer. As a temperature-resistant, salt-tolerant and fluid loss reducing agent for a drilling fluid in the drilling engineering, the polymer nano-silica temperature-resistant, salt-tolerant and fluid loss reducing agent has a remarkable fluid loss reducing effect under high temperature and high salinity.

Description

technical field [0001] The invention relates to a temperature-resistant, salt-resistant and fluid-loss-reducing agent with amphiphilic hydrophobic association polymer nano-silica, in particular to a viscosity-increasing, high-temperature-resistant, and water-resistant agent for drilling fluid in drilling engineering that can reduce fluid loss. Salt, and a polymer-based inorganic nano-silica fluid loss reducer with a "core-shell" structure and a preparation method thereof. Background technique [0002] During the drilling process, the phenomenon that the liquid phase in the drilling fluid seeps into the formation under the action of the pressure difference is called water loss. Excessive water loss per unit time will bring a series of adverse consequences, such as borehole wall collapse, borehole shrinkage and drilling failure. Liquid thickening and other problems, resulting in pipe sticking and other accidents. The liquid phase intruding into the formation can cause the exp...

AI Technical Summary

Problems solved by technology

At present, the most effective water-based drilling fluid in China is "three sulfonate" drilling fluid or polysulfonate drilling fluid. The treatment agents mainly include sulfonated lignite, sulfonated resin and sulfonated asphalt, etc., but there are still various deficiencies in practical application. These Commonly used drilling fluid treatment agents are not ideal for reducing water loss under the influence of high temperature, high salinity and high pressure, especially the treatment agent has poor temperature and salt resistance

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