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Phenol-urea-formaldhyde resin modified lignite filtrate loss reducer with high temperature resistance and salt tolerance, and its preparation method

A fluid loss reducer, lignite technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as foaming, achieve broad prospects, good viscosity reduction performance, and overcome the effects of foaming and viscosity improvement

Inactive Publication Date: 2012-04-11
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfomethyl phenolic resin SMP is a good anti-high temperature fluid loss reducer, there are two types of SMP-1 and SMP-2, but it has the disadvantages of severe foaming and increased drilling fluid viscosity, and SMP-1 must be combined with sulfonated The combined use of lignite SMC is effective. Although SMP-2 can be used in saturated brine drilling fluid, it must be used in combination with sulfonated lignite SMC and sulfonated tannin extract SMK to play a good role.

Method used

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  • Phenol-urea-formaldhyde resin modified lignite filtrate loss reducer with high temperature resistance and salt tolerance, and its preparation method
  • Phenol-urea-formaldhyde resin modified lignite filtrate loss reducer with high temperature resistance and salt tolerance, and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Measure 10ml of phenol and 13ml of formaldehyde into a 500ml three-necked flask with a graduated cylinder. The temperature is raised to above 60℃. Add 3.4g of sodium metabisulfite and react for 30min. Then add 10.7g of urea, 23ml of formaldehyde, and 3.4g of sodium metabisulfite. Add 10g of hydrolyzed polyacrylonitrile sodium salt (homemade, reference [1], the same below) above ℃, add sodium hydroxide solution (200ml distilled water, dissolve 12g sodium hydroxide) for 5min, and then add 60g brown coal (humic acid content ≥ 60%), react for 30 minutes, add 9 g sodium metabisulfite and 1 g polyacrylamide. React for 2-3.5h, take it out, cool, dry and crush to obtain product A.

Embodiment 2

[0021] Measure 11ml of phenol and 11ml of formaldehyde into a 500ml three-necked flask with a graduated cylinder. The temperature is raised to 60°C, 3.67g of sodium metabisulfite is added, and the reaction is 30min. After that, 11.73g of urea, 25.0ml of formaldehyde, and 3.67g of sodium metabisulfite are added. After ℃, add 10g hydrolyzed polyacrylonitrile sodium salt (homemade), react for 5min, add sodium hydroxide solution (200ml distilled water, dissolve 12g sodium hydroxide), then add 60g brown coal (humic acid content ≥60%), react for 30 minutes, add 9g partial bisulfite, 1g polyacrylamide. React for 2-3.5h, take it out, cool, dry and crush to obtain product B.

Embodiment 3

[0023] Measure 12ml phenol and 12ml formaldehyde into a 500ml three-necked flask with a graduated cylinder. The temperature is raised to 60°C, 4g sodium metabisulfite is added, and the reaction is for 30min. Then 12.8g urea, 28ml formaldehyde, 4g sodium metabisulfite are added, and the temperature is increased. 10g hydrolyzed polyacrylonitrile sodium salt (homemade), react for 5min, add sodium hydroxide solution (200ml distilled water, dissolve 12g sodium hydroxide), then add 60g lignite (humic acid content ≥60%), react for 30 minutes, add 9g sodium metabisulfite , 1g polyacrylamide. React for 2-3.5h, take it out, cool, dry and crush to obtain product C.

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PUM

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Abstract

The invention relates to a preparation method of a filtrate loss reducer used for drilling fluids. With lignite as the main material, the method first prepares a sulfonated phenol-urea-formaldhyde resin mixture, which is then reacted with an alkaline solution and lignite, thus obtaining a sulfonated phenol-urea-formaldhyde resin modified lignite filtrate loss reducer. The lignite filtrate loss reducer comprises the following reactants by weight: 10%-20% of lignite; 2%-4% of one of or a mixture of NaOH and KOH; 50%-60% of water; 2%-5.5% of phenol; 8%-15% of formaldehyde; 3%-7% of urea; 0.15%-2% of a hydrolyzed acrylonitrile sodium salt; 0.125%-0.5% of polyacrylamide; and 2%-7% of a sulfonating agent (one of or a mixture of sodium sulfite, sodium bisulfite, and sodium metabisulfite).

Description

Technical field [0001] The invention relates to a fluid loss reducer for drilling fluids and a preparation method thereof. The method uses urea, formaldehyde and phenol as modifiers to prepare a modified lignite fluid loss reducer, in particular to a fluid loss reducer with high temperature resistance and Drilling fluid additive with high fluid loss reduction effect. Background technique [0002] Filtrate reducer is an important drilling fluid treatment agent used to ensure the stability of drilling fluid performance, reduce the loss of harmful fluids to the formation, stabilize the borehole wall, and ensure well diameter rules. From the perspective of product categories, drilling fluid treatment agents have begun to change from The development of single compound and homopolymer to copolymer and grafted products, from the main use of natural products to modified natural products; from the point of view of protecting oil and gas reservoirs, fluid loss additives are an extremely im...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08G8/28C08G8/10C08G12/40C08G12/12
Inventor 张文郁鲍允纪班青何跃超胡范成
Owner QILU UNIV OF TECH
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