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Process for preparing drilling fluid thinner by modification of alkaline pulp black liquor

An alkaline pulping and production process technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of narrow application range, weak temperature resistance, unstable performance, etc., and achieve simple production process operation Convenience, strong temperature and salt resistance, and wide application range

Inactive Publication Date: 2006-10-04
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chromium-free lignin-based viscosity reducers are generally not strong in temperature resistance, and they need to be effective at high pH (10-12); although inorganic viscosity reducers have good viscosity reduction performance and good temperature resistance, However, its salt resistance is not good, and some cause pollution to the environment; organic viscosity reducers have good temperature resistance, especially salt resistance, but there is a small amount of addition, and they are easily consumed in field applications and need to be added frequently. Disadvantages of high cost and narrow application range
At present, although some chromium-free drilling fluid viscosity reducers have been developed, there are some problems such as poor effect, unstable performance, large dosage and high price.

Method used

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Examples

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Embodiment Construction

[0016] The production process of a modified alkali pulping waste fluid drilling fluid viscosity reducer of the present invention will be described in conjunction with the examples.

[0017] The technique of preparing drilling fluid viscosity reducer from modified alkali pulping waste liquid of the present invention is realized in this way:

[0018] Concentrated waste liquid in which the lignin content is not less than 25%-35%, 4%-6% sodium sulfite, 2%-9% formaldehyde, 2%-3% 2-acrylamido-2-methylpropanesulfonic acid, 3 %-9% acrylic acid, 1%-6% dimethyl diallyl ammonium chloride, 1%-4% initiator (NH 4 ) 2 Ce(NO 3 ) 6 , 0.5%-4% complexing agent FeSO 4 , to obtain a liquid product with a solid content of 30%-40% - drilling fluid viscosity reducer.

[0019] Application example 1 of self-made drilling fluid viscosity reducer:

[0020] 1. Viscosity reduction effect in fresh water slurry

[0021] Table 1 shows that the viscosity reducer has a good viscosity reduction effect in ...

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Abstract

The preparation method for alkali method of viscosity-reducing agent is to condense the sewage from modified alkaline pulping to let the lignin content more than 25-35% and put into temperature-controlled kettle for stepwise modification. The product has well performance up to effect by FCLS for wide application range. This invention is simple and low cost.

Description

technical field [0001] The invention relates to a production process of a modified alkali process pulping waste fluid drilling fluid viscosity reducer. Background technique [0002] Viscosity reducer is an indispensable drilling fluid treatment agent in the drilling process, and it plays a very important role in adjusting the rheology of drilling fluid. [0003] Most of today's paper mills use alkaline pulping, and alkali lignin is one of the main components in the black liquor of alkaline pulping. Therefore, the source of alkali lignin is abundant and the price is low. However, due to the complex structure and polydispersity of alkali lignin, and its unsatisfactory water solubility, the output of alkali lignin oilfield chemicals is not commensurate with the scale of black liquor discharged by the paper industry. At present, industrial lignin other than fuel is mainly lignosulfonate, which is used in large quantities to modify and produce iron chromium lignosulfonate (FCLS...

Claims

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Application Information

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IPC IPC(8): C09K8/035
Inventor 龙柱陈蕴智崔春仙陈夫山车大军
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY