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Method for preparing temperature-resistant anti-salt amphoteric polymer filtrate reducer

A technology of amphoteric polymer and fluid loss reducer, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low polymerization conversion rate, imidization reaction, slow reaction speed, etc., and achieve the molecular weight of the product. High, good polymerization stability, fast reaction effect

Inactive Publication Date: 2010-10-20
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the methods for synthesizing zwitterionic polymer fluid loss additives all use aqueous solution polymerization, the aqueous solution polymerization reaction speed is slow, the polymerization conversion rate is low, the molecular weight is low, imidization reaction easily occurs, and gel is formed, so the polymerization reaction Poor stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a three-necked flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, add 300 g of cyclohexane, then add 32.14 g of Span 80 and 12.86 g of Tween 80 to dissolve in the cyclohexane, and stir in a heat-collecting magnetic force. The mixture was slowly stirred and fully emulsified for 30 min under the device to form a stable emulsion. 10 g of acrylamide, 5 g of acrylic acid and 3 g of sodium styrene sulfonate were respectively added to 60 g of deionized aqueous solution to prepare a monomer mixed solution. The monomer mixed solution was slowly added dropwise to the emulsion, fully stirred for 30 min, slowly heated to 60 °C, then 0.09 g of ammonium persulfate and 0.036 g of sodium bisulfite were added to initiate polymerization for 3 hours, and finally the fully reacted microemulsion was used Excess ethanol precipitation, repeated washing with acetone, vacuum drying at 50 °C for 20 h, and grinding to obtain white solid powder.

[...

Embodiment 2

[0029] In a three-necked flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, add 300 g of n-hexane, then add 40 g of Span 85 and 20 g of Tween 85 to dissolve in n-hexane, and stir slowly under a heat-collecting magnetic stirrer. Fully emulsified for 30min to form a stable emulsion. 10 g of acrylamide, 6 g of acrylic acid and 2 g of sodium styrene sulfonate were respectively added to 90 g of deionized aqueous solution to prepare a monomer mixed solution. The monomer mixed solution was slowly added dropwise to the emulsion, fully stirred for 30min, slowly heated to 60°C, then 0.18g ammonium persulfate and 0.09g sodium bisulfite were added to initiate polymerization for 3h, and finally the fully reacted microemulsion was used Excess ethanol precipitation, repeated washing with acetone, vacuum drying at 50 °C for 20 h, and grinding to obtain white solid powder.

[0030] The zwitterionic polymer fluid loss reducer synthesized according t...

Embodiment 3

[0032] In a three-necked flask equipped with a thermometer, a reflux condenser, and a constant pressure dropping funnel, add 300 g of n-heptane, then add 22.5 g of Span 60 and 7.5 g of Tween 60 to dissolve in the n-heptane, and stir under a heat-collecting magnetic force. The mixture was slowly stirred and fully emulsified for 30 min under the device to form a stable emulsion. 4.5 g of acrylamide, 1.8 g of acrylic acid and 0.45 g of sodium styrene sulfonate were respectively added to 45 g of deionized aqueous solution to prepare a monomer mixed solution. The monomer mixed solution was slowly added dropwise to the emulsion, fully stirred for 30min, slowly heated to 60°C, then 0.046g of ammonium persulfate and 0.023g of sodium bisulfite were added to initiate polymerization for 3h, and finally the fully reacted microemulsion was used Excess ethanol precipitation, repeated washing with acetone, vacuum drying at 50 °C for 20 h, and grinding to obtain white solid powder.

[0033] ...

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Abstract

The invention relates to a method for preparing a temperature-resistant anti-salt amphoteric polymer filtrate reducer used for drilling fluid. In the filtrate reducer, C6 to C10 paraffin hydrocarbons are used as a continuous phase; Span and Tween are used as a compound non-ionic surface active agent, wherein the mass ratio of the Span to the Tween is 2-4:1-3; three monomers, namely acrylamide(AM), acrylic acid(AA) and styrene sulfonic sodium(SSS), are used as raw materials in a mass ratio of 10:3-6:1-4; and an initiator of ammonium persulphate or redox initiator of ammonium persulphate-sodium bisulphite is added for copolymerization by adopting an opposite micro-emulsion polymerization method to obtain the filtrate reducer. The filtrate reducer provided by the invention has the advantages of higher temperature resistance, salt resistance and filtrate-reducing property, simple preparation method, mild and controllable reaction conditions, high polymerization stability, high reaction speed and high conversion rate.

Description

1. Technical field [0001] The invention relates to a temperature-resistant and salt-resistant water-soluble polymer fluid loss reducer and a preparation method thereof. 2. Technical background [0002] Fluid loss control agent is an important drilling fluid treatment agent used to ensure stable performance of drilling fluid, reduce the invasion of harmful liquid into formation, and ensure regular well diameter and stable well wall. With the increasingly complex strata encountered and the increase in the number of special wells, ultra-deep wells and complex wells, higher requirements are put forward for drilling fluid fluid loss reducers to meet the salt tolerance (NaCl concentration greater than 10%, CaCl2 concentration greater than 5%) and new requirements for temperature resistance (temperatures above 150°C). Gelatinized starch, carboxymethyl cellulose, lignite, etc. are the earliest fluid loss control agents used in drilling fluids. With the deepening of research and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F212/14C08F2/32C09K8/035
Inventor 万涛姚杰张睿孙先长
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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