High-temperature resistant viscosity reducer for drilling fluids and preparation method for viscosity reducer

A high-temperature-resistant, viscosity-reducing agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of complex production process, difficulty in removing foam solids, high product cost, etc., and achieve simple preparation process and good viscosity reduction Effect, low-cost effect

Inactive Publication Date: 2013-01-30
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this method is main raw material with 2-acrylamido-2-methyl propane sulfonic acid, and product cost is high; The final product state of thi

Method used

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  • High-temperature resistant viscosity reducer for drilling fluids and preparation method for viscosity reducer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 80 parts of lignin, 100 parts of acrylic acid, 70 parts of maleic anhydride and 10 parts of iron powder into 510 parts of water, raise the temperature to 60-65 ° C for 2 hours; cool down to 50 ° C, add 55 parts of initiator; slowly add acrylonitrile 30 parts, react at 55-60°C for 2 hours; stop heating, add 35 parts of 30% ammonia water, 100 parts of potassium formate and 10 parts of iron powder, stir for 30 minutes and discharge to obtain high temperature anti-viscosity reducer for drilling fluid. Gained anti-high temperature viscosity reducer, investigate its performance, the results are shown in Table 1.

[0035] Table 1, embodiment 1 anti-high temperature viscosity reducer performance

[0036] project

Embodiment 2

[0038] Add 90 parts of lignin, 120 parts of acrylic acid, 50 parts of maleic anhydride and 20 parts of iron powder into 465 parts of water, raise the temperature to 60-75 ° C for 2 hours; cool down to 50 ° C, add 60 parts of initiator; slowly add acrylonitrile 40 parts, react at 50-70°C for 2 hours; stop heating, add 20 parts of sodium hydroxide, 120 parts of sodium formate and 15 parts of iron powder, stir for 30 minutes and discharge; that is, the anti-high temperature viscosity reducer for drilling fluid. The performance of the prepared anti-high temperature viscosity reducer was investigated, and the results are shown in Table 2.

[0039] Table 2, embodiment 2 anti-high temperature viscosity reducer performance

[0040] project

Embodiment 3

[0042] Add 50 parts of lignin, 80 parts of acrylic acid, 60 parts of maleic anhydride and 20 parts of iron powder into 475 parts of water, raise the temperature to 60-65 ° C for 2 hours; cool down to 50 ° C, add 55 parts of initiator; slowly add acrylonitrile 70 parts, react at 55-65°C for 2 hours; stop heating, add 25 parts of 30% ammonia water, 150 parts of sodium formate and 15 parts of iron powder, stir for 30 minutes and discharge to obtain high temperature anti-viscosity reducer for drilling fluid. The performance of the prepared anti-high temperature viscosity reducer was investigated, and the results are shown in Table 3.

[0043] Table 3, embodiment 3 anti-high temperature viscosity reducer performance

[0044] project

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Abstract

The invention provides a high-temperature resistant viscosity reducer for drilling fluids and a preparation method for the viscosity reducer. The preparation method comprises the following steps of: adding lignin, acrylic acid, maleic anhydride and a part of iron powder into water, and reacting at 60 to 75 DEG C for 1 to 2 hours; cooling to 48 to 52 DEG C, adding initiator, adding acrylonitrile, and reacting at 50 to 70 DEG C for 1 to 3 hours; and adding alkali to neutralize, adding formate and the rest of iron powder, and stirring for 30 minutes to obtain the high-temperature resistant viscosity reducer. By the method, the process is simple, and the cost is low; the obtained viscosity reducer has a good viscosity reducing effect in a low-density drilling fluid and a high-density drilling fluid, can be applied to deep wells and ultra deep wells, and is resistant to high temperature of 180 DEG C; and the viscosity reducer has good compatibility with the drilling fluids, and does not have adverse effect on drilling fluid performance.

Description

technical field [0001] The invention relates to a high-temperature-resistant viscosity reducer for drilling fluid and a preparation method thereof, and belongs to the technical field of viscosity reducer for drilling fluid in the process of petroleum drilling. technical background [0002] At present, with the needs of exploration and development of oil and gas fields, especially in recent years, the development of adjustment wells in many oil fields in old blocks is also increasing year by year. Most of the adjustment wells in old blocks are required to have higher drilling fluid density. At the same time, drilling fluid is required to have good rheology. At present, the commonly used weighting materials (iron ore powder, barite, etc.) have a certain thickening effect on the drilling fluid system, especially when the drilling fluid density reaches 1.60g / cm 3 When above, the performance is particularly prominent, the fluidity of the drilling fluid is particularly difficult ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F289/00
Inventor 吕开河韩立国任冠龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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