Preparation method of a high-efficiency drilling fluid anti-temperature and anti-salt fluid loss reducer
A technology of fluid loss control agent and drilling fluid, which is applied in the preparation of fluid loss control agent for drilling fluid and in the field of fluid loss control agent for drilling fluid, which can solve the problems of poor high temperature resistance, high hydrolysis temperature and energy consumption High-level problems, to achieve the effect of recycling waste, simple processing technology, and improving the effect of temperature resistance
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Embodiment 1
[0033] 80g waste acrylic fiber is washed, after drying, join in 3 liters of reaction flasks. Then add 80g of sodium thiocyanate and 100g of water into the reaction bottle, heat up to 70°C under stirring, until the waste acrylic fiber is completely dissolved, pour the dissolved acrylic fiber material into the water tank, solidify into sheet polyacrylonitrile, and bake at 90°C Let dry for 8 hours. The obtained polyacrylonitrile is pulverized in a pulverizer and screened through a 200-mesh screen to obtain a raw material with a particle size of polyacrylonitrile finer than 200 mesh. Take 40g of this raw material and add it to 50g of 20wt% NaOH aqueous solution under strong stirring, raise the temperature to 80°C, and react for 10 minutes to partially hydrolyze polyacrylonitrile to a degree of hydrolysis of 40%, and send it to a small spray drying tower for drying to obtain product A.
Embodiment 2
[0035] 80g waste acrylic fiber is washed, after drying, join in 3 liters of reaction flasks. Then add 80g of sodium thiocyanate and 100g of water into the reaction bottle, heat up to 70°C under stirring, until the waste acrylic fiber is completely dissolved, then pour the dissolved acrylic fiber material into the water tank, and solidify into sheet polyacrylonitrile, at 90°C Let dry for 8 hours. The obtained polyacrylonitrile is pulverized in a pulverizer and screened through a 100-mesh screen to obtain a raw material with a particle size of polyacrylonitrile finer than 100 mesh. Take 40g of this raw material and add it to 50g of 20wt% NaOH aqueous solution under strong stirring, raise the temperature to 80°C, and react for 15 minutes to partially hydrolyze polyacrylonitrile, the degree of hydrolysis is 42%, and send it to a small spray drying tower for drying to obtain product B.
Embodiment 3
[0037] 80g waste acrylic fiber is washed, after drying, join in 3 liters of reaction flasks. Then add 80g of sodium thiocyanate and 100g of water into the reaction bottle, heat up to 70°C under stirring, until the waste acrylic fiber is completely dissolved, then pour the dissolved acrylic fiber material into the water tank, and solidify into sheet polyacrylonitrile, at 90°C Let dry for 8 hours. The obtained polyacrylonitrile is pulverized in a pulverizer and screened through a 100-150 mesh screen to obtain a raw material with a polyacrylonitrile particle size of 100-150 mesh. Take 40g of this raw material and add it to 50g of 20wt% NaOH aqueous solution under strong stirring, raise the temperature to 80°C, and react for 20min to partially hydrolyze polyacrylonitrile, the degree of hydrolysis is 45%, and send it to a small spray drying tower for drying to obtain product C .
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