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Fluid loss additive for drilling fluid and preparation method thereof

A technology of fluid loss reducer and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that cannot meet the high temperature and high pressure fluid loss and rheological control, and achieve the improvement of salt resistance, reaction Easy process and simple operation

Active Publication Date: 2012-11-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing polymer fluid loss reducers can basically meet the needs of drilling at temperatures below 200°C, but cannot meet the needs of high temperature and high pressure fluid loss and rheological control of brine and saturated brine drilling fluids

Method used

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  • Fluid loss additive for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 320g of water, 94g of phenol, 208g of formaldehyde, 100g of sodium humate, 66.5g of sodium metabisulfite, and 88.2g of anhydrous sodium sulfite into the reactor, and react at 120°C for 8 hours to obtain a sulfonated phenolic humic acid resin; Add water and 60g of sodium hydroxide to the reaction flask. After the sodium hydroxide is dissolved and cooled, add 310.5g of AMPS, then add 140g of acrylamide and 150g of N,N-dimethylacrylamide, and stir until completely dissolved to obtain a reaction mixture of monomers Mix the sulfonated phenolic humic acid resin solution and the monomer reaction mixture evenly, add 1.8g ammonium persulfate initiator at 55°C, keep reacting at this temperature for 5 hours, dry and pulverize to obtain P ( AMPS-AM-AAM) / sulfonated phenolic humic acid resin graft copolymer.

Embodiment 2

[0023] Add 320g of water, 94g of phenol, 217g of formaldehyde, 110g of potassium humate, 76g of potassium pyrosulfite, and 82g of anhydrous potassium sulfite into the reactor, and react at 125°C for 7 hours to obtain a sulfonated phenolic humic acid resin; Add 550g of water and 56g of sodium hydroxide into the reaction flask. After the sodium hydroxide is dissolved and cooled, add 290g of AMPS, then add 126g of acrylamide and 140g of N,N-dimethylacrylamide, and stir until they are all dissolved to obtain the reaction of the monomer mixture. Mix the sulfonated phenolic humic acid resin solution and the monomer reaction mixture evenly, add 1.5g of ammonium persulfate initiator at 60°C, keep the reaction at this temperature for 6 hours, dry and pulverize to obtain P(AMPS -AM-AAM) / sulfonated phenolic humic acid resin graft copolymer.

Embodiment 3

[0025] Add 280g of water, 94g of phenol, 200g of formaldehyde, 95g of sodium humate, 60.8g of sodium pyrosulfite, and 107g of anhydrous sodium sulfite into the reactor, and react at 165°C for 7 hours to obtain a sulfonated phenolic humic acid resin; , 64g of sodium hydroxide was added to the reaction flask, after the sodium hydroxide was dissolved and cooled, 311g of AMPS was added, then 154g of acrylamide and 135g of N,N-dimethylacrylamide were added, and stirred until all of them were dissolved to obtain a reaction mixture of monomers; Mix the sulfonated phenolic humic acid resin solution and the monomer reaction mixture evenly, add 1.8g of ammonium persulfate initiator at 65°C, keep the reaction at this temperature for 6 hours, dry and pulverize to obtain P(AMPS- AM-AAM) / sulfonated phenolic humic acid resin graft copolymer.

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Abstract

The invention discloses a fluid loss additive for drilling fluid and a preparation method thereof, belonging to the technical field of chemical drilling fluid treating agents for oilfields. The method comprises the following steps of: carrying out one-step reaction on phenol, formaldehyde, humate, pyrosulfite and anhydrous sulfite so as to obtain a sulfonated phenolic humic acid resin; in the presence of an initiator, carrying out graft copolymerization on the sulfonated phenolic humic acid resin and a mixture of sodium hydroxide, 2-acrylamide-2-methyl-propyl sulfonate, acrylamide and dodecylacrylamide; and carrying out drying and crushing on the obtained product so as to obtain sulfonated phenolic humic acid resin-alkenyl monomer graft copolymer. The fluid loss additive disclosed by the invention has the functions of controlling the rheological property of drilling fluid and reducing the high-temperature and high-pressure filter loss of drilling fluid, not only enhances the thermal stability of side chains of a chain polymer, but also improves the salt tolerance of a sulfonated phenolic resin, and guarantees that products have good properties under high temperature and high salt conditions.

Description

Technical field: [0001] The invention relates to a fluid loss reducer for drilling fluid and a preparation method thereof, more precisely, it is a high-temperature fluid loss reducer for drilling fluid and a sulfonated phenolic humic acid resin-alkenyl monomer graft copolymer. The preparation method belongs to the technical field of oil field chemical drilling fluid treatment agent. Background technique: [0002] With the increasingly complex formations encountered, there are more and more deep and ultra-deep wells, and the bottom hole temperature can reach a high temperature above 200°C. Under high temperature conditions, more stringent requirements are put forward for the performance of drilling fluids. One of the key treatment agents for drilling fluid performance, its performance is the key to ensure the performance of drilling fluid. The polymer fluid loss reducer currently used in the field has a high relative molecular weight. In order to reduce fluid loss in brine d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F289/00C08F283/00C08F220/58C08F220/54C08F220/56C08F2/10C09K8/035
Inventor 王中华
Owner CHINA PETROLEUM & CHEM CORP
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