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Method for preparing amphoteric ion polymer fluid loss additive

A filtrate reducer and amphoteric ion technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of difficult control of synthesis conditions, expensive cationic monomers, considerable difficulty in industrial production and practical application, etc. Achieve high practical application ability and market prospect, increase the probability of capillary clogging, and enhance the effect of fluid loss control performance

Inactive Publication Date: 2010-03-24
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of synthesizing zwitterionic polymer fluid loss additives mainly uses acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as the main monomers, and then supplemented with other cationic monomers. (mainly quaternary ammonium salts), although it has good fluid loss reduction effect and high temperature and salt resistance, the synthesis conditions are not easy to control, and cationic monomers are very expensive.
Therefore, industrial production and practical application are quite difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A preparation method of zwitterionic polymer fluid loss control agent, it comprises the steps:

[0020] 1) According to the mass ratio of acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is 10:1, dissolve in water to obtain mixed solution A, the mass concentration of mixed solution A is 8 %;

[0021] 2) Mixed solution A was reacted for 3 hours at 35°C, pH value 3, and an initiator was added to obtain mixed solution B, wherein the initiator was acrylamide and 2-acrylamido-2-methylpropanesulfonic acid (AM and AMPS) mass of 0.1%;

[0022] 3) Cool the mixed solution B with an ice-water bath. After the temperature is stable, press -CONH 2 (amido):NaClO:NaOH=1:0.1:10 mass ratio (i.e. molar ratio) was added to the -10°C NaClO solution containing NaOH, and reacted in an ice-water bath for 5 hours to obtain a mixed solution C;

[0023] 4) Then slowly add the HCl solution according to the substance mass ratio (ie molar ratio) of HCl:NaOH=1:1 to obtain a vis...

Embodiment 2

[0030] A preparation method of zwitterionic polymer fluid loss control agent, it comprises the steps:

[0031] 1) According to the mass ratio of acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is 5:1, dissolve in water to obtain mixed solution A, the mass concentration of mixed solution A is 20 %;

[0032] 2) The mixed solution A was reacted for 4 hours at 50° C., with a pH value of 7, and an initiator was added to obtain a mixed solution B, wherein the initiator was acrylamide and 2-acrylamido-2-methylpropanesulfonic acid (AM and AMPS) mass 0.5%;

[0033] 3) Cool the mixed solution B with an ice-water bath. After the temperature is stable, press -CONH 2 (amido):NaClO:NaOH=1:0.5:10, add NaClO solution containing NaOH at 1°C, react in an ice-water bath for 8 hours, and obtain mixed solution C;

[0034] 4) Then slowly add the HCl solution according to the mass ratio of HCl:NaOH=1:1 to obtain a viscous product;

[0035] 5) The viscous product is repeatedl...

Embodiment 3

[0041] A preparation method of zwitterionic polymer fluid loss control agent, it comprises the steps:

[0042] 1) According to the mass ratio of acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is 3:1, dissolve in water to obtain mixed solution A, the mass concentration of mixed solution A is 30 %;

[0043] 2) The mixed solution A was reacted for 6 hours at 70°C, with a pH value of 10, and an initiator was added to obtain a mixed solution B, wherein the initiator was acrylamide and 2-acrylamido-2-methylpropanesulfonic acid (AM and AMPS) mass of 1%;

[0044] 3) Cool the mixed solution B with an ice-water bath. After the temperature is stable, press -CONH 2 (amido):NaClO:NaOH=1:1:10, add NaClO solution containing NaOH at 5°C, and react in an ice-water bath for 10 hours to obtain a mixed solution C;

[0045] 4) Then slowly add the HCl solution according to the mass ratio of HCl:NaOH=1:1 to obtain a viscous product;

[0046] 5) The viscous product is repeat...

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Abstract

The invention relates to a process for preparing amphoteric ion polymer fluid loss additive, which is characterized in that the process for preparation comprises the following steps: firstly, dissolving acrylamide and 2- acryloylamino-2-methylpropanesulfonic acid into water according to the mass ratio which is 10:1-3:1, getting mixed solution A, secondly, leading the mixed solution A to react 3-6hunder the temperature which is 35 DEG C to 70 DEF C, and pH value which is 3-10 and under the condition of adding with initiating agent, and getting mixed solution B, thirdly, cooling the mixed solution B with ice-water bath, adding NaClO which is -10 DEG C-5 DEG C and contains NaOH according to the substance ratio which is -CONH2:NaClO: NaOH=1:0.1:10-1:1:10, reacting 5-10h in ice-water bath, getting mixed solution C, fourthly, adding HCl solution, and getting viscous products, fifthly, stirring and washing viscous products in carbinol to get white sediment, and then taking out sediment, granulating, drying, disintegrating, and then getting products. The process for preparation has the advantages of high-temperature resistance, salinity tolerance and low production cost, and the conditionof the process is moderate and controllable.

Description

technical field [0001] The invention relates to a preparation method of a zwitterionic polymer fluid loss reducer. Background technique [0002] Filtrate reducer is an important drilling fluid treatment agent to ensure the stability of drilling fluid performance, reduce the loss of harmful liquid to the formation, stabilize the wellbore wall and ensure regular well diameter. With the development of oilfield drilling and the increase of deep well offshore drilling projects, the requirements for drilling fluid fluid loss control agents are also increasing to meet the salt tolerance (NaCl content greater than 10%, CaCl 2 content greater than 5%) and high temperature resistance (temperature higher than 150 ℃) new requirements. Currently commonly used fluid loss additives such as: pregelatinized starch, polyethylene oxide (PEO) and other non-ionic fluid loss additives, modified cellulose (CMC), modified starch (CMS), hydrolyzed polyacrylonitrile Anionic fluid loss control agent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035
Inventor 陈艳玲王艳新宋俊庭
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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