Amphoteric heat-resistant and salt-resistant filtrate reducer for drilling fluid and preparation method

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 problems such as fluid loss, achieve the effects of low residue, low raw material cost, and reduce damage

Inactive Publication Date: 2017-08-11
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For this reason, the present invention aims to develop a new fluid loss reducer to solve the problem of high temperature and high pressure fluid loss in the prior art

Method used

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  • Amphoteric heat-resistant and salt-resistant filtrate reducer for drilling fluid and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The parts by weight of raw materials are: acrylamide 280, 2-acrylamide-2-methylpropanesulfonic acid 56, acrylic acid 28, dimethyl diallyl ammonium chloride 42, N-vinylpyrrolidone 14, deionized water 546, Sodium hydroxide 10.55, potassium hydroxide 22.14, lauryl betaine 1.5, azobisisobutyronitrile 0.3, potassium persulfate 0.012, sodium bisulfite 0.008.

[0033] The specific preparation process is:

[0034] (1) Add acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, dimethyl diallyl ammonium chloride, N-vinylpyrrolidone and deionized water in sequence in the mixing tank, fully After dissolving, neutralize acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid with sodium hydroxide or potassium hydroxide, and adjust the pH value of the solution to 7.5-7.7, then add dodecane base betaine, mixed well;

[0035] (2) Deoxygenate with nitrogen for 60 minutes, add an initiator and polymerize at 14~16°C;

[0036] (3) After the reaction is over, take out th...

Embodiment 2

[0039] The parts by weight of raw materials are: acrylamide 300, 2-acrylamide-2-methylpropanesulfonic acid 60, acrylic acid 32, dimethyl diallyl ammonium chloride 45, N-benzyl-3-pyrrolidone 15, deionized Water 511, sodium hydroxide 11.7, potassium hydroxide 24.66, dodecyl betaine 1, azobisisobutyronitrile 0.5, potassium persulfate 0.02, sodium bisulfite 0.01.

[0040] The specific preparation process is:

[0041] (1) Add acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, acrylic acid, dimethyl diallyl ammonium chloride, N-benzyl-3-pyrrolidone, deionized Water, after fully dissolving, neutralize acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid with sodium hydroxide or potassium hydroxide, and adjust the pH value of the solution to 7.5~7.7, then add Lauryl Betaine, mix well.

[0042](2) Deoxygenate with nitrogen for 60 minutes, add an initiator and polymerize at 14~16°C;

[0043] (3) After the reaction is over, take out the jelly, granulate the rubber block, and...

Embodiment 3

[0046] The parts by weight of raw materials are: 330 parts by weight of acrylamide, 66 parts of 2-acrylamide-2-methyl propane sulfonic acid, 0.5 parts of sodium methacrylate, 35 parts of acrylic acid, 49.5 parts of dimethyl diallyl ammonium chloride, and 49.5 parts of N-vinyl Pyrrolidone 16.5, deionized water 462, sodium hydroxide 12.87, potassium hydroxide 27.03, lauryl amidopropyl betaine 1.5, azobisisobutyronitrile 0.4, potassium persulfate 0.035, sodium bisulfite 0.015.

[0047] The specific preparation process is:

[0048] (1) Add acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, sodium methacrylsulfonate, acrylic acid, dimethyl diallyl ammonium chloride, N-vinyl Pyrrolidone, deionized water, fully dissolved, neutralize acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid with sodium hydroxide or potassium hydroxide, and adjust the pH value of the solution to a value between 7.5 and 7.7 In the meantime, add lauryl amidopropyl betaine and mix thoroughly.

[00...

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Abstract

The invention discloses an amphoteric heat-resistant and salt-resistant filtrate reducer for drilling fluid and a preparation method. The amphoteric heat-resistant and salt-resistant filtrate reducer is prepared from, by weight parts, acrylamide, alkenyl sulfoacid or alkenyl sulphonate, acrylic acid, cationic monomers, rigid monomers, sodium hydroxide, potassium hydroxide, dispersant, deionized water, a molecular weight modifier and an initiator. The preparation method includes the steps that acrylamide, acrylic acid, alkenyl sulfoacid or alkenyl sulphonate, the cationic monomers, the rigid monomers and the deionized water are added into a reactor, after the materials are dissolved, the pH value of the solution is adjusted, the dispersant is added, the materials are mixed, then the mixture is transferred into a reaction still, nitrogen is introduced for deoxygenization, the initiator is added for triggering polymerization, and jelly is taken out after the reaction is completed, dried, smashed and sieved. The molecular weight of the filtrate reducer for the drilling fluid is controllable; the filtrate reducer can adapt to complex drilling conditions, and can be used in horizontal wells, high-temperature deep wells and evaporite beds; fewer residual monomers of the filtrate reducer for the drilling fluid are generated; the filtrate reducer and other oil field chemicals are good in compatibility; the preparation method is simple; the cost is low, and popularization is promoted.

Description

technical field [0001] The invention relates to an amphoteric anti-temperature and anti-salt anti-fluid loss additive for drilling fluid and a preparation method thereof, belonging to the field of chemical drilling fluid treatment agents for oilfields. Background technique [0002] During the drilling process, the drilling fluid will infiltrate when it flows through the permeable formation under pressure, causing the filtrate of the drilling fluid to invade the formation. This process is commonly known as "water loss". If the water loss is not controlled, the decrease of the liquid volume will increase the density of the cement slurry, and the thickening time and rheological properties will deviate from the original design requirements. A large amount of liquid will flow into the formation, making the cement slurry difficult to pump, and causing different degrees of damage to the formation. Injury, the filtrate intrusion into the formation will not only cause shale hydration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/06C08F226/04C08F226/10C08F228/02C09K8/035C09K8/24
CPCC08F220/56C09K8/035C09K8/24C08F220/585C08F220/06C08F226/04C08F226/10C08F228/02
Inventor 荣敏杰孙建波许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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