Polymer swollen microparticles for drilling fluid and preparation method thereof

A polymer and particle technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as unavailability of fluid loss control agents, improve the ability of stabilizing wellbore, strong formation adaptability, and reduce water loss. Effect

Active Publication Date: 2016-03-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the obtained fluid loss reducer cannot be used in solid-free drilling fluid systems

Method used

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  • Polymer swollen microparticles for drilling fluid and preparation method thereof
  • Polymer swollen microparticles for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add water and 20Kg of sodium hydroxide into the reaction kettle, stir evenly and cool to room temperature, then add 150Kg of sodium methacryl sulfonate, after it is completely dissolved, transfer it to a mixing kettle, add 600Kg of acrylamide under stirring, and wait until it is completely dissolved , add 100Kg of acrylic acid, stir evenly; put the mixed solution into the polymerization kettle, adjust the pH value of the polymerization system to 9.5 with aqueous sodium hydroxide solution, control the temperature at 20°C, add potassium persulfate and tetramethylethylenediamine aqueous solution to initiate A total of 2Kg of the agent was used to initiate the reaction, and the polymerization reaction was maintained for 1.5h; then 100Kg of epichlorohydrin was added, the temperature was controlled at 50°C, and the crosslinking reaction was maintained for 2h. After the polymerized jelly was cut and granulated, it was sent to the drying room. Dry at 105°C, and then pulverize to...

Embodiment 2

[0024] Add water and 18Kg of sodium hydroxide into the reaction kettle, stir evenly and cool to room temperature, then add 50Kg of sodium styrene sulfonate, after it is completely dissolved, transfer it to a mixing kettle, add 350Kg of acrylamide under stirring, and after it is completely dissolved, Add 60Kg of acrylic acid and stir evenly; put the mixed solution into the polymerization kettle, adjust the pH value of the polymerization system to 11 with potassium hydroxide aqueous solution, and control the temperature at 40°C, add hydrogen peroxide and ferrous chloride aqueous solution initiator for a total of 0.5 Kg initiates the reaction and maintains the polymerization reaction for 3 hours; then adds 100Kg of N,N'-methylenebisacrylamide, controls the temperature at 60°C, and maintains the cross-linking reaction for 4 hours. drying room, drying at 110°C, and then crushing to obtain polymer swollen particles.

Embodiment 3

[0026] Add water and 15Kg of sodium hydroxide into the reaction kettle, stir evenly and cool to room temperature, then add 80Kg of potassium isoprene sulfonate, after it is completely dissolved, transfer it to a mixing kettle, add 400Kg of acrylamide under stirring, and wait until it is completely dissolved Finally, add 80Kg of acrylic acid and stir evenly; put the mixed solution into the polymerization kettle, adjust the pH value of the polymerization system to 10 with potassium hydroxide aqueous solution, control the temperature at 50°C, add ammonium persulfate and sodium bisulfite aqueous solution initiator A total of 1Kg was used to initiate the reaction, and the polymerization reaction was maintained for 2 hours; then 80Kg of ethylene glycol diacrylate was added, the temperature was controlled at 60°C, and the cross-linking reaction was maintained for 5 hours. Dry at 120°C, and then pulverize to obtain polymer swollen particles.

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Abstract

The invention provides polymer swelling particles for a drilling fluid. The polymer swelling particles are obtained and prepared by reacting acrylamide, acrylic acid, alkenyl sulphonate monomer, a cross-linking agent, an initiator, water and a pH value regulator. The polymer swelling particles obtained by the invention are resistant to a temperature of 120 DEG C and resistant to 4wt% salt, and have multiple effects of tackifying, extracting, filtration loss lowering and the like at the same time. Products obtained in the invention are easily dispersed in water and very convenient to apply; moreover, polymer swelling particles with different strengths and different particle sizes can be prepared to obtain various solid phase-free drilling fluids with different parameters according to a certain proportion. The solid phase-free drilling liquid system is simple to prepare and maintain, and strong in adaptability to stratum characteristics, and has very good rheological behavior, inhibitive characteristic and filtration loss lowering characteristic.

Description

technical field [0001] The invention relates to a polymer swelling particle which can be used in drilling fluid, more specifically, it is a polymer swelling particle which can be used as the only main treatment agent to prepare solid-free drilling fluid and a preparation method thereof. Background technique [0002] The solid-free drilling fluid system does not contain bentonite, and its main components are organic polymers and salts. Using salts as weighting agents and inhibitors to improve the anti-collapse ability of the system; using polymers as viscosity and shearing agents to make the system have a good ability to carry suspended cuttings; compared with clear water, there is no solid phase Drilling fluid can form a thin and tough adsorption film on the well wall, has a certain ability to protect the wall from collapsing, and has better lubrication and drag reduction effects; compared with solid-phase drilling fluid containing bentonite, it has low flow resistance and v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08F220/56C08F220/06C08F228/02C08F212/14C09K8/12
Inventor 杨小华钱晓琳赵素丽陈铖王琳李胜董晓强
Owner CHINA PETROLEUM & CHEM CORP
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