Water-based filtrate reducer for drilling fluid and preparation method thereof

Abstract

The invention relates to a water-based filtrate reducer for a drilling fluid and a preparation method thereof. The preparation method comprises the following steps: successively adding monomers containing sulfo groups, organosilicon monomers containing unsaturated double bonds and polyanion fibers into water in proportion, adjusting a pH value to 7 to 8 and carrying out a reaction in the presence of an initiator. The water-based filtrate reducer provided by the invention has excellent filtrate reducing performance both in salt water and saturated salt water, and can resist a high temperature of 180 DEG C; the preparation method and desired equipment are simple; and the preparation method is easy to implement.

Description

technical field

[0001] The invention relates to a fluid loss reducer for water-based drilling fluid and a preparation method thereof. The fluid loss reducer for water-based drilling fluid prepared by the invention is suitable for the technical field of oil field drilling engineering. Background technique

[0002] Drilling fluid treatment agent is an important part of oilfield chemical agents, and is one of the products with a large amount of oilfield chemical agents. Drilling fluid fluid loss control agent is one of the drilling fluid treatment agents with the largest sales volume and the most active research and development. First, it plays an important role in oil drilling. Drilling fluid fluid loss reducer can play a role in reducing fluid loss and improving the quality of mud cake in drilling fluid. An important chemical treatment agent to ensure well caliper regulation and oil and gas formations. It plays an important role in safe and efficient drilling and preventing...

Examples

Embodiment 1

[0015] Polyanionic cellulose: 30%, vinyl sulfonic acid: 10%, methacryloxypropyltrimethoxysilane: 10%, ammonium persulfate: 0.5%, and the rest is water (all in mass ratio). Add appropriate amount of water and vinyl sulfonic acid: 10%, methacryloxypropyltrimethoxysilane: 10%, anionic cellulose: 30% to the reactor according to the order of addition, start stirring, and use hydrogen Potassium to adjust the pH value to 7-8, stir well, raise the temperature of the reaction kettle to 60°C, maintain a constant temperature, add ammonium persulfate: 0.1%, keep stirring for 2 hours, cool to room temperature, dry and pulverize to prepare water-based drilling fluid. Filtrate.

Embodiment 2

[0017] Polyanionic cellulose: 20%, vinylsulfonic acid: 10%, methacryloyloxymethyldimethoxysilane: 30%, ammonium persulfate: 1%, and the rest is water (all in mass ratio). Add appropriate amount of water and vinylsulfonic acid: 15%, methacryloyloxymethyldimethoxysilane: 10%, anionic cellulose: 20% to the reactor according to the order of addition, start stirring, use hydrogen Potassium oxide to adjust the pH value to 7-8, stir well, raise the temperature of the reaction kettle to 60°C, maintain a constant temperature, add ammonium persulfate: 1%, continue to stir for 2 hours, cool to room temperature, dry and pulverize to prepare water-based drilling fluid Filtrate reducer.

Embodiment 3

[0019] Polyanionic cellulose: 25%, vinyl sulfonic acid: 20%, methacryloxypropyltriethoxysilane: 20%, potassium persulfate: 0.5%, and the rest is water (all in mass ratio). Add appropriate amount of water and vinylsulfonic acid: 20%, methacryloxypropyltriethoxysilane: 20%, anionic cellulose: 25% to the reactor according to the order of addition, start stirring, use hydrogen Potassium oxide adjusts the pH value to 7-8, stirs fully, raises the temperature of the reactor to 60°C, maintains a constant temperature, adds potassium persulfate: 0.5%, continues to stir for 2 hours, cools to room temperature, and makes water-based drilling fluid after drying and crushing Filtrate reducer.

technical field

[0001] The invention relates to a fluid loss reducer for water-based drilling fluid and a preparation method thereof. The fluid loss reducer for water-based drilling fluid prepared by the invention is suitable for the technical field of oil field drilling engineering. Background technique

[0002] Drilling fluid treatment agent is an important part of oilfield chemical agents, and is one of the products with a large amount of oilfield chemical agents. Drilling fluid fluid loss control agent is one of the drilling fluid treatment agents with the largest sales volume and the most active research and development. First, it plays an important role in oil drilling. Drilling fluid fluid loss reducer can play a role in reducing fluid loss and improving the quality of mud cake in drilling fluid. An important chemical treatment agent to ensure well caliper regulation and oil and gas formations. It plays an important role in safe and efficient drilling and preventing...

Examples

Embodiment 1

[0015] Polyanionic cellulose: 30%, vinyl sulfonic acid: 10%, methacryloxypropyltrimethoxysilane: 10%, ammonium persulfate: 0.5%, and the rest is water (all in mass ratio). Add appropriate amount of water and vinyl sulfonic acid: 10%, methacryloxypropyltrimethoxysilane: 10%, anionic cellulose: 30% to the reactor according to the order of addition, start stirring, and use hydrogen Potassium to adjust the pH value to 7-8, stir well, raise the temperature of the reaction kettle to 60°C, maintain a constant temperature, add ammonium persulfate: 0.1%, keep stirring for 2 hours, cool to room temperature, dry and pulverize to prepare water-based drilling fluid. Filtrate.

Embodiment 2

[0017] Polyanionic cellulose: 20%, vinylsulfonic acid: 10%, methacryloyloxymethyldimethoxysilane: 30%, ammonium persulfate: 1%, and the rest is water (all in mass ratio). Add appropriate amount of water and vinylsulfonic acid: 15%, methacryloyloxymethyldimethoxysilane: 10%, anionic cellulose: 20% to the reactor according to the order of addition, start stirring, use hydrogen Potassium oxide to adjust the pH value to 7-8, stir well, raise the temperature of the reaction kettle to 60°C, maintain a constant temperature, add ammonium persulfate: 1%, continue to stir for 2 hours, cool to room temperature, dry and pulverize to prepare water-based drilling fluid Filtrate reducer.

Embodiment 3

[0019] Polyanionic cellulose: 25%, vinyl sulfonic acid: 20%, methacryloxypropyltriethoxysilane: 20%, potassium persulfate: 0.5%, and the rest is water (all in mass ratio). Add appropriate amount of water and vinylsulfonic acid: 20%, methacryloxypropyltriethoxysilane: 20%, anionic cellulose: 25% to the reactor according to the order of addition, start stirring, use hydrogen Potassium oxide adjusts the pH value to 7-8, stirs fully, raises the temperature of the reactor to 60°C, maintains a constant temperature, adds potassium persulfate: 0.5%, continues to stir for 2 hours, cools to room temperature, and makes water-based drilling fluid after drying and crushing Filtrate reducer.