High-temperature-resistant viscosity-reduction filtrate reducer for drilling fluid and preparation method of filtrate reducer

A filtrate reducer and high temperature resistance technology, which is applied in the field of oil drilling, can solve the problems of high cost, unsatisfactory viscosity reduction effect, unfavorable large-scale use in industrial production oil fields, etc., and achieve low cost, good viscosity reduction effect, and increased temperature resistance effect of ability

Inactive Publication Date: 2013-04-03
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product of this invention can resist high temperature and has good fluid loss reduction, but the viscosity reduction effect is not ideal, and it uses AMPS and α-methyl glucoside, the cost is high, which is not conducive to industrial production and large-scale use in oil fields

Method used

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  • High-temperature-resistant viscosity-reduction filtrate reducer for drilling fluid and preparation method of filtrate reducer
  • High-temperature-resistant viscosity-reduction filtrate reducer for drilling fluid and preparation method of filtrate reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]Take 75 parts of acrylic fiber waste, cut it into pieces, add it to 1000 parts of water together with 30 parts of sodium hydroxide, raise the temperature to 90°C under stirring, and react for 3 hours; cool down to 85°C, add 30 parts of nitric acid with a concentration of 20wt% React with 40 parts of hydrogen peroxide at 90°C for 2 hours; add 80 parts of sodium hydroxide, 300 parts of lignite, 20 parts of sodium metabisulfite and 25 parts of formaldehyde, and react at 95°C for 2 hours; cool down to 70°C, add 10 parts of seven Ferrous sulfate in water, react for 20 minutes; discharge, dry and crush to obtain.

[0050] Take the anti-high temperature viscosity reducing fluid loss reducing agent prepared by the method of Example 1, and investigate its performance, and the results are shown in Table 1.

[0051] Table 1

[0052] project

Embodiment 2

[0053] Example 2: Take 120 parts of acrylic fiber waste, cut it into pieces, add it and 40 parts of potassium hydroxide to 1000 parts of water, raise the temperature to 95 °C under stirring, and react for 4 hours; cool down to 80 °C, add 50 parts of the concentration of 20wt % hydrochloric acid and 45 parts of hydrogen peroxide, heat up to 90°C for 3 hours; add 100 parts of sodium hydroxide, 350 parts of lignite, 25 parts of sodium bisulfite and 30 parts of formaldehyde, react at 95°C for 2 hours; cool down to 80°C , add 15 parts of ferrous sulfate heptahydrate, react for 30 minutes; discharge, dry and pulverize to obtain.

[0054] Take the anti-high temperature viscosity reducing fluid loss reducing agent prepared by the method of Example 2, and investigate its performance, and the results are shown in Table 2.

[0055] Table 2

[0056] project

Embodiment 3

[0057] Example 3: Take 160 parts of acrylic waste silk, cut it into pieces, add it and 45 parts of sodium hydroxide to 1000 parts of water, heat up to 88°C under stirring, and react for 2.5h; cool down to 85°C, add 55 parts of 20wt% of sulfuric acid and 45 parts of hydrogen peroxide, heated to 95°C for 2 hours; added 105 parts of potassium hydroxide, 400 parts of lignite, 30 parts of sodium sulfate and 40 parts of formaldehyde, reacted at 90°C for 3 hours; cooled to 60°C, Add 12 parts of ferrous sulfate heptahydrate, react for 15 minutes; discharge, dry and pulverize to obtain.

[0058] Get the anti-high temperature viscosity reducing fluid loss reducing agent prepared by the method of Example 3, investigate its performance, the results are as shown in table 3:

[0059] table 3

[0060] project

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Abstract

The invention relates to a high-temperature-resistant viscosity-reduction filtrate reducer for a drilling fluid and a preparation method of the filtrate reducer. The filtrate reducer comprises the raw materials of waste acrylon fibers, alkali, mineral acid, hydrogen peroxide, lignite, a sulfonating agent, formaldehyde, copperas and water, wherein the waste acrylon fibers and part of alkali are added in water for reaction at the temperature of 85-95 DEG C; the mineral acid and the hydrogen peroxide are added when the temperature is reduced to 80-85 DEG C, and then the temperature is increased to 85-95 DEG C for reaction for 1-3 h; the remained alkali, lignite, sulfonating agent and formaldehyde are added for reaction for 1-3 hours at the temperature of 85-95 DEG C; the temperature is reduced to 60-80 DEG C, and then ferrous sulfate is added for reaction for 10-30 min; and finally, the product is fetched for drying and smashing. The obtained filtrate reducer not only can reduce the drilling fluid viscosity, but also has a good de-filtration effect and is resistant to high temperature. The filtrate reducer takes the waste acrylon fibers and the lignite as main raw materials, is low in cost and simple in process.

Description

technical field [0001] The invention relates to a high-temperature anti-viscosity and fluid loss reducing agent for drilling fluid and a preparation method thereof, belonging to the technical field of petroleum drilling. technical background [0002] During the drilling process, the drilling fluid has a certain viscosity, shear force and low fluid loss, which is the premise and basis to ensure the smooth progress of drilling. With the increasing number of deep wells and ultra-deep wells, due to the high temperature and high pressure at the bottom of the well, on the one hand, some drilling fluid fluid loss control agents degrade and fail under high temperature conditions, resulting in increased drilling fluid fluid loss, which is not conducive to maintaining wells wall stability and reservoir protection, on the other hand, it is necessary to use a large amount of weighting material to increase the density of drilling fluid, balance the formation pressure, and prevent well ki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03
Inventor 吕开河任冠龙刘天科
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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