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Amphoteric ion polymeric alcohol for drilling fluid and its preparation method

A technology of zwitterion and polyalcohol, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as drilling fluid viscosity increase, and achieve the effect of inhibiting hydration and good anti-slump effect.

Active Publication Date: 2008-12-24
唐山冀油瑞丰化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention purpose of the present invention is: in order to improve the adsorption capacity of polyalcohol to clay, improve the cloud point of polyalcohol, improve the anti-high temperature performance of polyalcohol, be used in land and sea deep layer (3500~5500m) oil and gas layer drilling, solve the electropositive property Drilling fluid viscosity increase problem caused by high temperature, provide a zwitterionic polymerization for drilling fluid produced by polymerization reaction of alkenyl acid, alkenyl amide, alkenyl sulfonic acid, alkenyl quaternary ammonium salt with ethylene oxide, propylene oxide Alcohol and preparation method, achieve the purpose of improving the performance of polyalcohol

Method used

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  • Amphoteric ion polymeric alcohol for drilling fluid and its preparation method
  • Amphoteric ion polymeric alcohol for drilling fluid and its preparation method
  • Amphoteric ion polymeric alcohol for drilling fluid and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Example 1. Add 50g of acrylic acid, 165g of acrylamide, 95g of 2-acrylamido-2-methylpropanesulfonic acid, 45g of allyltrimethylammonium chloride, 750g of ethylene oxide, and ethylene oxide into the polymerization reactor. 1650 g of oxypropane, 65 g of propylene glycol as a starter, and 25 g of benzoyl peroxide as a polymerization catalyst were heated to 105° C. under constant stirring. The polymerization reaction started and proceeded violently. Cooling water was introduced to adjust the reaction temperature.

[0016] Keep the reaction temperature at 120-135°C and the reaction pressure at 0.3-0.5Mpa. After 2-3 hours of reaction, pass in cooling water to cool to 70-80°C. Slowly add the polymer to another reaction vessel. There is a pre-prepared potassium hydroxide solution with a concentration of 20% (mass percentage) in the reaction vessel. The neutralization reaction is exothermic. The temperature of the reactor is controlled at 80% by cooling water. -90°C, when the soluti...

Embodiment 2

[0017] Example 2. Add 65g of methacrylic acid, 145g of acrylamide, 100g of 2-acrylamido-2-methylpropanesulfonic acid, 37g of allyltrimethylammonium chloride, and 900g of ethylene oxide into the polymerization reactor. And 1600g of propylene oxide, 73g of glycerol as starter, 22g of benzoyl peroxide as polymerization catalyst, heated to 105℃ under constant stirring, the polymerization reaction starts, adjust the reaction temperature by cooling water, and control the temperature at 110-140℃ Within the range, the reaction pressure is 0.2-0.6MPa, after 2-3h of reaction, it is cooled to 70-80℃ by cooling water. The polymer is slowly added to a reaction vessel containing a potassium hydroxide solution with a concentration of 20% (mass percentage) for neutralization reaction, and the reaction temperature is controlled at 80-90°C. When the pH of the solution is 7-8, the neutralization reaction is completed, and 7400 g of the zwitterionic polymeric alcohol for drilling fluid with a concent...

Embodiment 3

[0018] Example 3: Rheological test of drilling fluid

[0019] The fresh water base slurry used in the test is 4% Anqiu sodium bentonite, and the brine base slurry is a 4% NaCl aqueous solution with 10% Anqiu sodium bentonite. The test method is in accordance with the SY / T5621-93 drilling fluid test procedure. The test results are shown in Table 1.

[0020] Table 1 The effect of zwitterionic polyalcohol on the rheology of drilling fluid

[0021]

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Abstract

The invention relates to a kind of amphion poly-alcohol used in well boring liquid as well as its preparing method which belongs to the domain of accessory ingredient for well boring liquid. The ingredient of the invention includes olefinic acid, alkenyl amide, alkenyl sulfonic acid, alkenyl quaternary ammonium salt, ekibon, epoxypropane, alkenyl metamer. The ratio of alkenyl metamer, ekibon and epoxypropane is 10-30%:15-30%: 20-80%. The preparing procedure includes the following steps: putting the material into the polymerizing reactor and adding the initiator and polymerization catalyst to let them react at 100-150DEG C, 0.1 -2Mpa for 1-5h; neutralizing the polymerized product with carstic potash solution to get the product. The invention has many characteristics such as high temperature proof, salt proof, strong rejection capability, oil gas protection and environment-friendly. It can be used to prevent the collapse, protect the oil gas or be used as the slime stabilizing agent in the proving and exploring of oil and natural gas.

Description

Technical field [0001] The invention relates to an auxiliary agent for drilling fluid and a preparation method thereof, in particular to a zwitterionic polyol for drilling fluid that protects oil and gas reservoirs and the environment, and a preparation method thereof. Background technique [0002] Oil-based drilling fluids have been used for a long time to drill into water-sensitive formations to solve the problems of shale stability, differential pressure stuck and mud-packed drill bits. Oil-based drilling fluids pollute the environment, have an impact on logging operations, are costly, and are restricted in use. Polyalcohol drilling fluid is one of the latest international drilling fluid technologies in the 1990s and is a good substitute for oil-based drilling fluids. USPat.No.5602082 (Hale AH.) and USPat.No.5945386 (Alonso-DeboltM A.) proposed the use of polymerized alcohols produced by the polymerization of ethylene oxide and propylene oxide in water-based drilling fluids, I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/38C08F220/06C08F220/56C08G59/17
Inventor 乔孟占
Owner 唐山冀油瑞丰化工有限公司
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