Method for preparing fluid loss additive for drilling fluid

A technology of fluid loss reducer and drilling fluid, which is applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as troubles and risks in production, difficulty in compatibility of retarders and accelerators, etc., and achieve drilling efficiency High, good salt resistance, low filtration effect

Active Publication Date: 2010-10-06
XINJIANG DELAND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Of course, the performance evaluation is not limited to the fluid loss reduction effect, but also includes the influence on other properties of the cement slurry and the compatibility with other

Method used

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  • Method for preparing fluid loss additive for drilling fluid

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Effect test

Embodiment 1

[0039] Prepared in parts by weight, take 30 parts of sodium humate, 25 parts of etherified starch, 10 parts of hydroxyethyl cellulose, 7 parts of polyacrylamide, and 6 parts of water-soluble silicone oil; stir under sealing, heat to 120 ° C, and the pressure is 1.0Mpa, constant temperature for 10 hours to obtain semi-finished products; semi-finished products were dried at 100°C, crushed, and added with 10 parts of sulfonated asphalt to compound to obtain fluid loss reducer.

[0040] The synthesis of etherified starch is to take 50 parts of starch, soak in 50 parts of 10% NaOH solution to swell for 24 hours, dry at 75°C, and grind to obtain a semi-finished product; take 30 parts of the semi-finished product, add 30 parts of chloroacetic acid, seal Stir, control the pressure to 1.2Mpa, pH to 7.5, heat to 140°C, and keep the temperature for 16 hours.

[0041] Among the raw materials of the fluid loss control agent, the etherified starch is self-made, and the others are commercial...

Embodiment 2

[0043] Prepared in parts by weight, take 35 parts of sodium humate, 30 parts of etherified starch, 15 parts of hydroxyethyl cellulose, 5 parts of polyacrylamide, and 10 parts of water-soluble silicone oil; stir under sealing, heat to 120 ° C, and the pressure is 1.2Mpa, constant temperature for 8 hours to get a semi-finished product; the semi-finished product was dried at 85°C, crushed, and 7 parts of sulfonated asphalt was added to compound to obtain a fluid loss reducer.

[0044] The synthesis of etherified starch is to take 80 parts of starch, soak in 80 parts of 10% NaOH solution to swell for 28 hours, dry at 85°C, and grind to obtain a semi-finished product; take 50 parts of the semi-finished product, add 50 parts of chloroacetic acid, seal Stir, control the pressure to 1.0Mpa, pH to 7.0, heat to 145°C, and keep the temperature for 17 hours.

[0045] Among the raw materials of the fluid loss control agent, the etherified starch is self-made, and the others are commerciall...

Embodiment 3

[0047] Prepared in parts by weight, take 32 parts of sodium humate, 20 parts of etherified starch, 12 parts of hydroxyethyl cellulose, 10 parts of polyacrylamide, and 5 parts of water-soluble silicone oil; stir under sealing, heat to 120 ° C, and the pressure is 0.8Mpa, constant temperature for 9 hours to get a semi-finished product; the semi-finished product was dried at 90°C, crushed, and 5 parts of sulfonated asphalt was added to compound to get a fluid loss reducer.

[0048] The synthesis of etherified starch is to take 70 parts of starch, soak in 70 parts of 10% NaOH solution to swell for 26 hours, dry at 80°C, and grind to obtain a semi-finished product; take 40 parts of the semi-finished product, add 40 parts of chloroacetic acid, seal Stir, control the pressure to 0.8Mpa, pH to 8.0, heat to 135°C, and keep the temperature for 15 hours.

[0049] Among the raw materials of the fluid loss control agent, the etherified starch is self-made, and the others are commercially ava...

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Abstract

The invention provides a method for preparing a fluid loss additive for drilling fluid. The fluid loss additive is mainly prepared from the following raw materials in part by weight: 30 to 35 parts of humic acid sodium, 20 to 30 parts of etherified starch, 10 to 15 parts of hydroxyethyl cellulose, 5 to 10 parts of polyacrylamide and 5 to 10 parts of water soluble silicone oil, preferably 30 parts of humic acid sodium, 25 parts of etherified starch, 10 parts of hydroxyethyl cellulose, 7 parts of polyacrylamide and 6 parts of water soluble silicone oil. The preparation method comprises the following steps of: heating the raw materials to 120 DEG C under sealing and stirring conditions and under the pressure of 0.8 to 1.2MPa, keeping the temperature for 8 to 10 hours to obtain a semi-finished product; and drying the semi-finished product at the temperature of between 85 and 100 DEG C, and adding 5 to 10 parts of sulfonated asphalt into the semi-finished product to obtain the fluid loss additive, wherein at the step of synthesizing the etherified starch, 50 to 80 parts of starch are soaked into 50 to 80 parts of 10-percent sodium hydroxide solution for swelling for 24 to 48 hours, the mixed solution is dried at the temperature of between 75 and 85 DEG C, the obtained product is ground to obtain the semi-finished product, 30 to 50 parts of chloroactic acid are added into 30 to 50 parts of the semi-finished product, the mixed solution is sealed and stirred, the pressure is controlled to be 0.8 to 1.2MPa, the PH value is adjusted to 7 to 8, and the mixed solution is heated to 135 to 145 DEG C and then kept at the constant temperature for 15 to 17 hours to obtain the etherified starch. The fluid loss additive possesses high anti-salt, anti-calcium and anti-high temperature properties, and has the effects of carrying drill cuttings and making mud cakes dense.

Description

technical field [0001] The invention relates to the modification of the fluid loss reducer used in drilling fluid, so that the obtained fluid loss reducer has strong salt resistance, calcium resistance, high temperature resistance, low fluid loss, and can protect the oil layer from mud Pollution plays the role of carrying cuttings and making the mud cake compact. Background technique [0002] During the drilling process of deep and ultra-deep wells, due to the influence of geothermal gradient and formation pressure gradient, the drilling fluid is under the condition of high temperature above 180°C for a long time, and there are high-temperature dispersion of clay, high-temperature degradation of organic polymer compounds, and high-temperature crosslinking of treatment agents. And other influences lead to poor rheological properties of drilling fluid and affect production, etc. In all kinds of drilling fluid treatment agents, the amount of fluid loss control agent is the firs...

Claims

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Application Information

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IPC IPC(8): C09K8/035
Inventor 曾凡付王刚田孝敬马江平
Owner XINJIANG DELAND
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