Preparation And Field Application Of Nano-silicon Anti-mite

The problem of cementing gas has become the primary problem affecting the quality of cementing,and the selection of cementing materials has a great influence on the occurrence of gas.The organic cementing materials such as conventional latex have great sensitivity to the formation and many conditions for use.Restriction,and inorganic cementing materials such as silica have good comprehensive performance and good prospects for use.With the development of ultra-deep wells and the accompanying high-temperature anti-gas enthalpy problem,it is urgent to study nano-silica anti-mite.In this paper,the physical depolymerization of the sander and the depolymerization of the chemical layer,preferably the dispersant,are carried out on the physical layer,and the white carbon black is introduced into the emulsion preparation material to obtain nanometers with the applicable conditions of 300 nm and 400 nm.Grade silica emulsion.The molecular structure,thermal stability and particle size distribution of the nano-silicon emulsion were characterized by FITR,micro-rheology and particle size analysis.Infrared spectroscopy indicated that the emulsion component was silica and the micro-rheology was used to measure the emulsion.The storage critical temperature is 120 °C,which can be used to quickly evaluate the quality of nano-silicon emulsion.The particle size test analysis shows that the emulsion dispersion is relatively uniform,and the particle size of the emulsion can meet the particle grading effect with cement particles.Using a classification of the particle size,a particle size of 300 nm and a particle size of 400 nm,a nano-silicon cement slurry system suitable for both 120 ° C and 180 ° C temperature conditions is formed.The basic properties and anti-gas barrier properties of nano-silicon cement slurry under the corresponding temperature conditions were evaluated and analyzed by microscopic SEM electron microscopy.The experimental results show that the basic performance of nano-silicon cement slurry is good.With the increase of nano-silicone emulsion dosage,the API water loss is obviously reduced to 35 m L,the SPN value is obviously reduced to less than 1,and the cement stone permeability reduction effect reaches 78%.The compressive strength of 28 d remained unchanged.The cementation strength of cement stone and wall increased from 0MPa to 4MPa,and the development time of static gel strength was shortened to 6min.When the amount of 15% nano-silicone emulsion was increased,the performance of cement stone remained stable for a long time.Combined with field application feedback research,1% addition of complexing agent DTPA and 2% addition of PEG200 can effectively solve the thixotropic problem of cement slurry cold slurry.1%-1.2% addition of DTPA can effectively solve nano silicon cement slurry and Retarders are not compatible.The field application of 1-9?139.7mm tail pipe cementing and TK915-12H?177.8mm tail pipe cementing in Shunbei shows that the nano-silicon cement slurry system can effectively solve the gas enthalpy problem and meet the site demand.