Filtrate reducer for oil field drilling fluid and preparation method thereof

A filtrate reducer and oilfield drilling technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as unstable product quality, difficulty in controlling the degree of sulfonation, and affecting the effect of fluid loss control, and achieve improved Thermal stability and salt resistance, ease of control, effect of good performance

Inactive Publication Date: 2014-03-05
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of synthesis (sulfonation), the degree of sulfonation is not easy to control, which may easily lead to unstable product quality and affect the effect of fluid loss reduction

Method used

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  • Filtrate reducer for oil field drilling fluid and preparation method thereof
  • Filtrate reducer for oil field drilling fluid and preparation method thereof
  • Filtrate reducer for oil field drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Accurately weigh 1.736g p-aminobenzenesulfonic acid, 15.624g p-toluenesulfonic acid and 17.1g phenol into a three-necked flask; Adjust the value to 9; set the reaction temperature to 85°C, heat up and stir to dissolve; weigh 19.32g of formaldehyde in a constant pressure dropping funnel, control the dropping time, and completely add it to the reaction system within 1 hour; Start timing, react for 6 hours and cool to obtain a brownish-red liquid product, wash with absolute ethanol until a white flocculent precipitate appears, and after separation, dry the precipitate in a vacuum oven for 24 hours to obtain the fluid loss reducer for drilling fluid.

Embodiment 2

[0015] Accurately weigh 3.472g p-aminobenzenesulfonic acid, 13.88g p-toluenesulfonic acid and 16.4g phenol into a three-necked flask; Adjust the value to 9; set the reaction temperature to 70°C, heat up and stir to dissolve; weigh 20.02g of formaldehyde in a constant pressure dropping funnel, control the dropping time, and completely add it to the reaction system within 1.2 hours; Start timing, react for 4 hours and cool to obtain a brownish-red liquid product, wash with absolute ethanol until a white flocculent precipitate appears, and after separation, dry the precipitate in a vacuum drying oven for 24 hours to obtain the fluid loss reducer for drilling fluid.

Embodiment 3

[0017] Accurately weigh 5.2078g p-aminobenzenesulfonic acid, 12.152g p-toluenesulfonic acid and 15.9g phenol into the three-necked flask; add 20ml of sodium hydroxide solution with a mass percentage concentration of 50% to adjust the pH of the reaction system Adjust the value to 9; set the reaction temperature to 85°C, heat up and stir to dissolve; weigh 20.52g of formaldehyde in the constant pressure dropping funnel, control the dropping time, and completely add it to the reaction system within 1.3 hours; Start timing, react for 6 hours and cool to obtain a brownish-red liquid product, wash with absolute ethanol until a white flocculent precipitate appears, and after separation, dry the precipitate in a vacuum oven for 24 hours to obtain the fluid loss reducer for drilling fluid.

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PUM

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Abstract

The invention relates to a filtrate reducer for an oil field drilling fluid for a petroleum enterprise and a preparation method thereof. The filtrate reducer can be used for favorably controlling the rheological property of the drilling fluid and decreasing the filter loss of high-temperature and high-pressure basic mud of the drilling fluid so as to improve the salt tolerance of the drilling fluid. According to the technical scheme, the filtrate reducer is a quadripolymer prepared by polymerizing the following monomers by mass percent: 3.2% to 16.1% of p-sulfanilic acid, 16% to 29.1% of p-methylbenzene sulfonic acid, 26% to 31.8% of phenol and 35.9% to 41.7% of formaldehyde. The preparation method comprises the following steps: adding a sodium hydroxide solution with the mass percentage concentration being 50% into the monomers; regulating the pH (Power Of Hydrogen) of a reaction system to reach 9; performing a thermostatic reaction for 4 to 7 hours by setting the reaction temperature at 70 DEG C to 90 DEG C; washing the mixture with absolute ethyl alcohol until separating out precipitates; and drying the precipitates for 24 hours at the temperature of 85 DEG C, thereby preparing the filtrate reducer. The filtrate reducer has the good performance under high-temperature and high-salt conditions. The preparation method is simple in process, easy to control and low in cost. The filtrate reducer is used for the oil field drilling fluid.

Description

technical field [0001] The invention relates to a fluid loss reducer for oilfield drilling fluid used in petroleum enterprises and a preparation method thereof, belonging to the field of chemical drilling fluid treatment agents for oilfields. Background technique [0002] During the drilling process of oil and gas fields, the drilling fluid percolates under the pressure difference between the formation and the drilling fluid column, and a large amount of filtrate invades the formation, which can easily cause hydration expansion and collapse of shale in the formation, resulting in instability of the wellbore. In addition, the increase of drilling fluid filtration loss will cause the thickening of mud cake and the reduction of well diameter, which will easily cause swabbing and pressure fluctuations during tripping, which will cause a large torque to the rotary drilling tool, resulting in differential pressure sticking , The fluid loss control agent can also improve the rheolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08G8/32C09K8/24
CPCC09K8/035C08G16/0237C09K8/24
Inventor 鲁红升袁潇黄志宇张太亮全红平戴姗姗
Owner SOUTHWEST PETROLEUM UNIV
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