High temperature resistant fluid loss reducing agent and preparation method thereof

A technology of fluid loss control agent and high temperature resistance, applied in the field of fluid loss control agent for drilling fluid and high temperature resistance fluid loss control agent for drilling fluid. Effect of temperature resistance, improved temperature and salt resistance, good salt resistance and calcium resistance

Inactive Publication Date: 2018-12-07
CNPC DRILLING RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application 201210429020.1 discloses a high-temperature, salt-, and calcium-resistant fluid loss reducer for drilling fluids and its preparation method. Starch phosphate is formed by the reaction of starch and phosphate to reduce the fluid loss of drilling fluids, but its temperature resistance The ability is also around 150°C, and there is no major breakthrough

Method used

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  • High temperature resistant fluid loss reducing agent and preparation method thereof
  • High temperature resistant fluid loss reducing agent and preparation method thereof

Examples

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Embodiment 1

[0037] This embodiment provides a high temperature resistant fluid loss reducer, which is prepared through the following steps:

[0038] Add 25g of potato starch into a reactor filled with 150mL of distilled water, mix well, add 0.3g of sodium trimetaphosphate, adjust the pH value to 10 with sodium carbonate, heat the starch milk to 50°C, and react for 1.5h to obtain an intermediate product;

[0039] Dissolve 5 g of acrylamide, 15 g of 2-acrylamido-2-methylpropanesulfonic acid, 10 g of dimethyldiallyl ammonium chloride, and 6 g of N-vinylpyrrolidone in 100 mL of distilled water and wash with sodium hydroxide Adjust the pH value to 7;

[0040] Add the above intermediate product, raise the temperature to 60°C under the protection of nitrogen, slowly add 0.15g ammonium persulfate, react for 4h, then wash twice with ethanol and distilled water respectively, dry in a vacuum drying oven at 20°C until constant weight, and pulverize , to obtain high temperature fluid loss reducer.

Embodiment 2

[0042] This embodiment provides a high temperature resistant fluid loss reducer, which is prepared through the following steps:

[0043] Add 20g of potato starch into a reactor filled with 80mL of distilled water, mix well, add 0.8g of acetic anhydride, adjust the pH value to 9 with sodium carbonate, heat the starch milk to 30°C, and react for 3 hours to obtain an intermediate product;

[0044] Dissolve 8g of acrylamide, 16g of 2-acrylamido-2-methylpropanesulfonic acid, 12g of dimethyldiallylammonium chloride and 8g of N-vinylpyrrolidone in 120mL of distilled water, adjust the pH with sodium hydroxide value to 7;

[0045] Add the above-mentioned intermediate product, raise the temperature to 65°C under the protection of nitrogen, slowly add 0.2g potassium persulfate, react for 3.5h, then wash twice with ethanol and distilled water respectively, and dry in a vacuum oven at 20°C until constant weight. Pulverize to obtain high temperature resistant fluid loss reducer.

Embodiment 3

[0047] This embodiment provides a high temperature resistant fluid loss reducer, which is prepared through the following steps:

[0048] Add 20g of corn starch into a reactor filled with 100mL of distilled water, mix well, add 0.4g of sodium trimetaphosphate, adjust the pH value to 10 with sodium carbonate, heat the starch milk to 50°C, and react for 2 hours to obtain an intermediate product;

[0049] Dissolve 6g of acrylamide, 18g of 2-acrylamido-2-methylpropanesulfonic acid, 10g of acryloyloxyethyltrimethylammonium chloride and 5g of N-vinylpyrrolidone in 100mL of distilled water, adjust the pH with sodium hydroxide value to 7;

[0050] Add the above-mentioned intermediate product, raise the temperature to 70°C under the protection of nitrogen, slowly add 0.16g ammonium persulfate, react for 3.5h, then wash twice with ethanol and distilled water, and dry in a vacuum oven at 20°C until constant weight. Pulverize to obtain high temperature resistant fluid loss reducer.

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Abstract

The invention provides a high temperature resistant fluid loss reducing agent and a preparation method thereof. The preparation method comprises: crosslinking starch, a crosslinking agent and a pH adjuster in an aqueous medium at 20 to 55 DEG C in a reaction to obtain an intermediate product, mixing alkenylamide, alkenylsulfonic acid or alkenylsulfonate, alkenyl quaternary ammonium salt and alkenyl alkanone, adjusting pH of the mixture to 7 so that a mixed solution is obtained, adding the intermediate product into the mixed solution in a nitrogen protective atmosphere at 50 to 80 DEG C, initiating polymerization by an initiator, carrying out polymerization for 3-5h and carrying out washing, drying, stoving and crushing to obtain the high temperature resistant fluid loss reducing agent. Thehigh temperature resistant fluid loss reducing agent is non-toxic and environmentally friendly, resists a temperature of 200 DEG C and has good salt and calcium resistance.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid, in particular to a high temperature resistant fluid loss reducer for drilling fluid, which belongs to the technical field of petroleum exploitation. Background technique [0002] With the rapid development of the world's petroleum industry, oil and gas exploration and development are gradually developing in deep formations, offshore and environmentally sensitive formations. Environmental protection and temperature resistance issues are becoming more and more prominent. Control drilling fluid pollution to the environment from the source, and develop environmental protection and temperature resistance. A good green drilling fluid treatment agent to achieve "green" drilling is an effective way to solve environmental problems. As one of the important treatment agents for water-based drilling fluid, fluid loss control agent plays an important role in ensuring safe, fast and efficient drilling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08B31/00C08F251/00C08F220/56C08F220/58C08F226/02C08F226/10C08F220/34
CPCC09K8/035C08B31/003C08F251/00C08F220/585C08F220/34
Inventor 闫丽丽王立辉吴鑫磊王建华孙明昊董浩安高珊王发云
Owner CNPC DRILLING RES INST
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