High-temperature colloid protecting anticaving fluid loss additive for drilling fluid and preparation method thereof

A technology of fluid loss control agent and drilling fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc.

Inactive Publication Date: 2012-05-02
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, foreign high-temperature colloidal stabilizers cannot meet the requirements of high-temperature rubber protection, and domestic high-temperature colloidal stabilizers have not been

Method used

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  • High-temperature colloid protecting anticaving fluid loss additive for drilling fluid and preparation method thereof
  • High-temperature colloid protecting anticaving fluid loss additive for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0014] Example 1:

[0015] A high-temperature protective rubber anti-collapse fluid loss agent for drilling fluid, and its preparation method is as follows:

[0016] 1) Add 250 parts by weight of water to the reactor, add 5 parts by weight of acrylamide and 40 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid into the kettle, stir and dissolve to a concentration of 15% by mass (two The sum of the concentration of two solutes, the same below), add 3 parts by weight of acrylic acid to fully stir and dissolve;

[0017] 2) Add a potassium hydroxide aqueous solution with a concentration of 20% by mass to adjust the pH to 7;

[0018] 3) Protect with nitrogen for 20 minutes;

[0019] 4) Heat the above solution to 50°C, and add 4 parts by weight of dimethyldiallyl ammonium chloride, 1 part by weight of initiator with a concentration of 10% by weight—ammonium persulfate aqueous solution and 2 parts by weight of relative molecular weight Control agent-mercaptan, constant temperature ...

Example Embodiment

[0034] Example 2:

[0035] A high-temperature protective rubber anti-collapse fluid loss agent for drilling fluid, and its preparation method is as follows:

[0036] 1) Add 300 parts by weight of water to the reaction kettle, add 10 parts by weight of acrylamide and 60 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid into the kettle, stir to dissolve into a 19% aqueous solution, and then add 5 Acrylic acid by weight is fully stirred and dissolved;

[0037] 2) Add a 20% potassium hydroxide aqueous solution to adjust the pH to 8;

[0038] 3) Nitrogen protection for 30 minutes;

[0039] 4) Heat the above solution to 60°C, add 7 parts by weight of dimethyldiallyl ammonium chloride, 2 parts by weight of 15% initiator-ammonium persulfate aqueous solution and 3 parts by weight of relative molecular mass control agent —— Mercaptan, at a constant temperature of 5h, to obtain a colloidal product;

[0040] 5) Precipitate and wash the obtained product with 100 parts by weight of aceton...

Example Embodiment

[0042] Example 3:

[0043] A high-temperature protective rubber anti-collapse fluid loss agent for drilling fluid, and its preparation method is as follows:

[0044] 1) Add 350 parts by weight of water to the reaction kettle, add 8 parts by weight of acrylamide and 50 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid into the kettle, stir to dissolve into a 14% aqueous solution, and then add 4 Acrylic acid by weight is fully stirred and dissolved;

[0045] 2) Add a 20% potassium hydroxide aqueous solution to adjust the pH to 7.5;

[0046] 3) Nitrogen protection for 30 minutes;

[0047] 4) Heat the above solution to 55°C, add 6 parts by weight of dimethyldiallyl ammonium chloride, 2 parts by weight of 13% initiator—ammonium persulfate and 2 parts by weight of relative molecular mass control agent— -Mercaptan, constant temperature for 3h, get a colloidal product;

[0048] 5) Precipitate and wash the obtained product with 100 parts by weight of acetone to remove unreacted subst...

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Abstract

The invention discloses a high-temperature colloid protecting anticaving fluid loss additive for a drilling fluid. A preparation method of the high-temperature colloid protecting anticaving fluid loss additive comprises the following steps of: dissolving acrylamide and 2-acrylamido-2-methylpropanesulfonic acid into 10-25 percent mixed aqueous solution; adding acrylic acid, fully stirring and dissolving and then adding a potassium hydroxide aqueous solution; adjusting the pH value to be 7-8; introducing nitrogen gas for protecting for 20-30 minutes; heating to be 50-60DEG C; adding dimethyldiallyl-ammonium chloride, ammonium persulfate and thiol and keeping the contant temperature for 2-5 hours to obtain a colloidal product; washing the colloidal product with acetone; removing an unreacted substance, keeping the constant temperature of about 105DEG C and drying for 2-4 hours; and crushing and sieving the crushed substance by a sieve with 60 meshes to obtain a white powdery product, namely the high-temperature colloid protecting anticaving fluid loss additive for the drilling fluid. According to the high-temperature colloid protecting anticaving fluid loss additive, the stability of high-temperature colloid in a waste-based drilling fluid system can be effectively improved.

Description

technical field [0001] The invention relates to an anti-slump and fluid loss agent for high-temperature drilling fluid protective glue and a preparation method thereof. Background technique [0002] Drilling fluid must have good high-temperature colloidal stability under high-temperature deep well and ultra-deep well drilling conditions, so as to ensure that the drilling fluid has good rheology and fluid loss wall-building properties under high-temperature conditions at the bottom of the well. Filtration wall-building property refers to the formation of a filter cake with good compactness, thin thickness, high strength and good lubricity on the wellbore wall while the drilling fluid is filtering out free water from the wellbore to the near-borehole wall, thereby preventing the drilling fluid from Further filtration or leakage to the formation, to avoid the occurrence of downhole complex accidents such as shrinkage, sticking, and well collapse. The formation of high-quality ...

Claims

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Application Information

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IPC IPC(8): C08F220/58C08F220/56C08F220/06C08F226/02C09K8/035
Inventor 王富华王瑞和王力王成文
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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