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Preparation method of filtrate reducer for drilling fluid

A fluid loss control agent and drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem that the water-based drilling fluid cannot be effectively strengthened to resist ultra-high calcium pollution, and the performance of the water-based drilling fluid is greatly affected. , The effect of calcium resistance and fluid loss reduction is not obvious, and the effect of good compatibility, stable rheology and fluid loss performance, and good temperature resistance is achieved.

Active Publication Date: 2016-07-13
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the existing treatment agents represented by the above-mentioned patent documents have poor compatibility with conventional water-based treatment agents in actual use, and have a great impact on the performance of water-based drilling fluids, and cannot effectively strengthen the resistance of water-based drilling fluids to ultra-high The ability of calcium pollution, anti-calcium fluid loss reduction effect is not obvious

Method used

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  • Preparation method of filtrate reducer for drilling fluid
  • Preparation method of filtrate reducer for drilling fluid
  • Preparation method of filtrate reducer for drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] a. At 25°C, dissolve 2.8g of sodium hydroxide A and 0.7g of calcium oxide B in 100mL of distilled water, stir at 3000r / min for 10min, fully dissolve, and obtain solution a;

[0033] b. Add 10 g of acetic anhydride into solution a, stir at a high speed of 3000 r / min for 5 minutes, fully dissolve, and obtain solution b;

[0034] c. Continue to add 20g of 2-hydroxy-3-allyloxysulfonic acid into solution b, stir at a high speed of 3000r / min for 5min, fully dissolve, and obtain solution c;

[0035] d. Continue to add 1.0 g of nano-zinc oxide into solution c, stir at a high speed of 3000 r / min for 10 min, fully dissolve, and obtain solution d;

[0036] e. While stirring at a high speed of 3000r / min, heat the solution d in a water bath to 70±5°C;

[0037] f. Maintain 70±5°C, slowly add 0.2g ammonium persulfate dropwise to solution d while stirring, and react for 4 hours to obtain the preliminary product;

[0038] g. Washing of the product: wash the resultant with ethanol to r...

Embodiment 2

[0041] a. Under the condition of 25°C, dissolve 2.6g of potassium hydroxide A and 0.65g of magnesium oxide B in 100mL of distilled water, stir at 3000r / min for 10min, fully dissolve, and obtain solution a;

[0042] b. Add 8g of maleic anhydride into solution a, stir at 3000r / min for 5min at a high speed, fully dissolve, and obtain solution b;

[0043] c. Continue to add 22g of 2-acrylamide-2-methylpropanesulfonic acid into solution b, stir at a high speed of 3000r / min for 5min, fully dissolve, and obtain solution c;

[0044] d. Continue to add 1.0 g of nano-titanium oxide into solution c, stir at a high speed of 3000 r / min for 10 min, fully dissolve, and obtain solution d;

[0045] e. While stirring at a high speed of 3000r / min, heat the above solution d in a water bath to 70±5°C;

[0046] f. Keep at 70±5°C, slowly add 0.1g of potassium persulfate dropwise to solution d while stirring, and react for 4 hours to obtain the preliminary product;

[0047] g. Washing of the produc...

Embodiment 3

[0050] a. Dissolve 3.0g of potassium hydroxide A and 0.75g of calcium oxide in 100mL of distilled water at 25°C, and stir at 3000r / min for 10min to fully dissolve.

[0051] b. Add 15g of maleic anhydride to a, and stir at 3000r / min for 5min to fully dissolve.

[0052] c. Continue to add 15g of 2-acrylamide-2-methylpropanesulfonic acid into b, and stir at a high speed of 3000r / min for 5min to fully dissolve.

[0053] d. Continue to add 1.0 g of nano-titanium oxide into c, and stir at a high speed of 3000 r / min for 10 min to fully dissolve.

[0054] e. While stirring at a high speed of 3000r / min, heat the above homogeneously mixed liquid in a water bath to 70±5°C.

[0055] f. Keeping at 50±5°C, slowly add 0.15 g of ammonium persulfate dropwise to e while stirring, and react for 4 hours to obtain the preliminary product.

[0056] g. Product washing: wash the product with methanol to remove excess impurities.

[0057] h. After vacuum drying, the product is crushed into white po...

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Abstract

The invention discloses a preparation method of a filtrate reducer for drilling fluid.The preparation method of the filtrate reducer for the drilling fluid is characterized by comprising the following steps: 1, dissolving 2.5-3.0 parts by weight of an alkaline substance A and 0.6-0.75 part by weight of metallic oxides in 100 parts by weight of water, and stirring until the alkaline substance and the metallic oxides are dissolved fully to obtain a solution a; b, adding 9-11 parts by weight of monomer C in the solution a, and stirring until the monomer C is dissolved fully to obtain a solution b; c, adding 18-22 parts by weight of monomer D into the solution, and stirring until the monomer D is dissolved fully to obtain a solution c; d, adding 0.9-1.0 part by weight of monomer E into the solution c, and stirring until the monomer E is dissolved fully to obtain a solution d; e, continuing stirring, and heating the solution d in water bath until the temperature reaches 70+ / - 5 DEG C; and f, maintaining the temperature to be 70+ / - 5 DEG C, slowly dropwise adding 0.08-0.1 part by weight of an initiator F into the solution d while stirring, and reacting for 4-5 hours to obtain a preliminary product.The filtrate reducer prepared by the method seldom affects the performance of the water-based drilling fluid, and resistance of the water-based drilling fluid to ultra-high calcium pollution can be enhanced effectively.

Description

technical field [0001] The invention relates to the technical field of preparation technology of fluid loss control agent for drilling fluid in the field of petroleum and natural gas. Background technique [0002] When the drilling fluid encounters brine layer, gypsum layer and cement plug, it will encounter serious calcium pollution. Divalent calcium ions will replace monovalent sodium ions adsorbed on the clay surface, making the repulsion between clay particles smaller, flocculating and thickening, resulting in increased viscosity and increased filtration of drilling fluid. Ions can destabilize the drilling fluid. In recent years, with the continuous development of oil exploration, more and more high-calcium formations have been drilled, and the problem of ultra-high calcium pollution will seriously affect the safety, speed and cost of drilling projects. [0003] At present, the main methods to deal with calcium pollution are sodium carbonate or sodium pyrophosphate pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/02C09K2208/34
Inventor 陶怀志欧阳伟蒋官澄周扬王星媛刘凡彭双磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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