Research and Application of High Density Anti-high Temperature Drilling Fluid in Ultra-deep Wells
By introducing the fluid loss reducer XNPCL-1 and the nano-micron plugging agent of scientific research products,and selecting the material of the high-temperature drilling fluid system,the formula of the high-density high-temperature resistant drilling fluid system was obtained as follows:3%base slurry +5%potassium chloride +0.3%potassium polyacrylamide+0.6%polyamine inhibitor +3%fluid loss reducer XNPCL-1 +3%natural polymer complex JNJS220+3%wall stabilizer HQ-10+3%nanomicron blocking agent +3%superfine calcium carbonate +5%RH220+0.5%wear reducer(increased to 2.1 g·cm-3).The indoor evaluation results showed that the high-density anti-high-temperature drilling fluid system had good comprehensive performance and has been successfully applied in the ultra-deep well Rentan1,overcoming the technical problems such as high temperature in the narrow hole section of the well,instability of the well wall,salt water pollution and acid gas pollution.
Ultra deep wellHigh densityResistance to high temperatureResearchApplication
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