Preparation method of cationic silicon-fluorine thinning agent for drilling fluid

Abstract

The invention discloses a preparation method of a cationic silicon-fluorine thinning agent for drilling fluid. The preparation method comprises the following steps: 1), sequentially adding 50 ml of methyl methacrylate and 100 ml of butyl acrylate into 500 ml of distilled water, stirring uniformly, further adding 7.5 ml of Span-80, stirring for 1 h to form a monomer pre-emulsion; 2), taking out the pre-emulsion, sequentially adding 35 ml of hexafluorobutyl methacrylate, 25 ml of dodecafluoroheptyl methacrylate, 25 ml of gamma-methacryloxypropyltrimethoxysilane and 40 ml of vinyl trimethoxy silane, and performing ultrasonic oscillation dispersion for 10 min; 3), taking 1 / 5 of emulsion which is subjected to ultrasonic oscillation, adding 3 g of ammonium persulfate into the emulsion, and adding the emulsion into a flask for heating in water bath, and further adding 3 g of ammonium persulfate and distilled water into the emulsion after the heated emulsion reaches the reaction temperature; 4), after the emulsion gives out blue light, dropwise adding the residual 4 / 5 of emulsion within 15 min, and adding 3 g of ammonium persulfate for heat preservation for 1 h, and finally taking out. With the adoption of the thinning agent prepared by adopting the preparation method provided by the invention, the interaction between clays is reduced, and the viscosity of drilling fluid is further decreased.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a method for preparing a cationic silicon-fluorine diluent for drilling fluid. Background technique [0002] With the deepening of oil and gas exploration and development, oil and gas exploration has developed to deep strata and offshore, the well depth has gradually increased, and the stratum conditions encountered have become increasingly complex. Drilling engineering has put forward higher requirements for drilling fluid technology, especially for deep wells with high solids It is particularly difficult to comprehensively solve the contradictions among the rheology, inhibition, and temperature resistance of drilling fluids, especially the thermal stability of deep well drilling fluids has always been the key to research at home and abroad. The viscosity reducer is one of the indispensable drilling fluid treatment agents in the drilling process. It can reduce the v...

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Problems solved by technology

[0004] At the same time, the commonly used diluents are lignin and tannin extract viscosity reducers. Whether it is the dry powder of the viscosity reducer disclosed in the CN101368090 patent document or the lignin and tannin extract viscosity reducer, the temperature resistance effect is not good, and the dilution effect Unstable, when the temperature reaches 130°C, the treatment period only lasts about 3 days, and the treatment capacity is large. At the same time, the addition of traditional viscosity reducers will cause damage to oil and gas layers

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