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Preparation method of modified lignin-based drilling fluid viscosity reducer

A lignin-based, drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of poor universality, poor viscosity reduction effect, and narrow application range, and achieves good viscosity reduction effect and low cost. Low and simple preparation steps

Inactive Publication Date: 2016-11-16
仇颖莹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: aiming at the problems of poor viscosity-reducing effect, poor universality and narrow application range of the current oil-soluble viscosity reducer, the present invention mainly uses calcium lignosulfonate as raw material, and synthesizes iron-manganese woody wood through chemical modification. Calcium sulfonate, and then compatible with sodium tripolyphosphate to prepare composite calcium iron manganese lignosulfonate, and through graft polymerization, introduce acrylamide and acrylic acid monomers to modify it to synthesize acrylamide / Acrylic acid-iron manganese lignosulfonate calcium graft copolymer viscosity reducer, because the molecular chain contains a large number of sulfonic acid groups, the structure is stable, it has good viscosity reduction effect, and has strong temperature resistance and salt resistance , Anti-calcium pollution ability

Method used

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Examples

Experimental program
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example 1

[0016] First weigh 180g of ferrous sulfate heptahydrate, add it into 400mL of 10% hydrochloric acid solution, stir at a rate of 400r / min until the solid dissolves, and use a constant flow pump to flow from the bottom of the reaction vessel at a flow rate of 1mL / min. For 30 minutes, pass through hydrogen peroxide with a mass fraction of 20%, and heat the reaction for 2 hours in a 60°C constant temperature water bath, and cool to room temperature to obtain a displacer; then weigh 120g of calcium lignosulfonate and add it to 950mL of deionized water, stir and mix evenly, Then add 120mL of the replacement agent prepared above, and drop tributyl phosphate to adjust its pH value to 6.2. After reacting for 30 minutes in a constant temperature water bath at 60°C, add 75g of manganese dioxide, and oxidize it in a constant temperature water bath at 72°C. React for 40 minutes, after cooling to 60°C, add 15g of sodium tripolyphosphate to the mixture, stir evenly, put the mixture in a dryin...

example 2

[0019] First weigh 150g of ferrous sulfate heptahydrate, add it to 300mL of 10% hydrochloric acid solution, stir at a rate of 300r / min until the solid dissolves, and use a constant flow pump to flow from the bottom of the reaction vessel at a flow rate of 1mL / min. For 20 minutes, pass through hydrogen peroxide with a mass fraction of 20%, and heat the reaction for 1 hour in a 55°C constant temperature water bath, and cool to room temperature to obtain a displacer; then weigh 100g of calcium lignosulfonate and add it to 900mL of deionized water, stir and mix evenly, Then add 100mL of the replacement agent prepared above, and drop tributyl phosphate to adjust its pH value to 6.0. After reacting for 20 minutes in a constant temperature water bath at 55°C, add 70g of manganese dioxide, and oxidize it in a constant temperature water bath at 70°C. React for 30 minutes, after cooling to 55°C, add 12g of sodium tripolyphosphate to the mixture, stir evenly, put the mixture in a drying o...

example 3

[0022]First weigh 160g of ferrous sulfate heptahydrate, add 350mL of mass concentration to 10% hydrochloric acid solution, stir at a rate of 350r / min until the solid dissolves, and use a constant flow pump to flow from the bottom of the reaction vessel at a flow rate of 2mL / min. For 25 minutes, inject hydrogen peroxide with a mass fraction of 20%, and heat the reaction for 1 hour in a 57°C constant temperature water bath, and cool to room temperature to obtain a displacer; then weigh 110g of calcium lignosulfonate and add it to 920mL of deionized water, stir and mix evenly, Then add 110mL of the replacement agent prepared above, and drop tributyl phosphate to adjust its pH value to 6.1. After reacting for 25 minutes in a constant temperature water bath at 56°C, add 72g of manganese dioxide, and oxidize it in a constant temperature water bath at 71°C. React for 35 minutes, after cooling to 57°C, add 13g of sodium tripolyphosphate to the mixed solution, stir evenly, put the mixed...

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Abstract

The invention relates to a preparation method of a modified lignin-based drilling fluid viscosity reducer, belonging to the technical field of viscosity reducer preparation. The present invention mainly uses calcium lignosulfonate as a raw material, synthesizes iron-manganese calcium lignosulfonate through chemical modification, and then is compatible with sodium tripolyphosphate to prepare composite type iron-manganese calcium lignosulfonate, and through graft polymerization reaction, introduce acrylamide and acrylic acid monomers to modify it, and synthesize acrylamide / acrylic acid-iron manganese calcium lignosulfonate graft copolymer viscosity reducer, because the molecular chain contains a large number of sulfonic acid groups, the structure Stable, with good viscosity reduction effect, the viscosity reduction rate can reach more than 97.9%, and has strong temperature resistance, salt resistance, calcium pollution resistance.

Description

technical field [0001] The invention relates to a preparation method of a modified lignin-based drilling fluid viscosity reducer, belonging to the technical field of viscosity reducer preparation. Background technique [0002] In the process of petroleum development, the exploitation of heavy oil has generally been paid attention to. Shallow heavy oil reservoirs have low temperature, and the heavy oil has poor fluidity under reservoir conditions, and steam flooding is usually used to exploit them; deep wells / ultra-deep wells have relatively high reservoir temperatures, and can flow under reservoir conditions. With the lifting of the wellbore, the viscosity of the crude oil gradually increases, and even becomes unable to flow, which seriously affects the production of heavy oil. Therefore, the use of viscous reducing fluid can effectively reduce its viscosity and promote its flow. The viscosity-reducing mechanism of the viscosity-reducing agent is that the molecules of the ...

Claims

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Application Information

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IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 仇颖莹雷春生
Owner 仇颖莹
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