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A kind of chromium-free viscosity reducer for oil field drilling fluid and preparation method thereof

A technology of oilfield drilling and viscosity reducer, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effects of wide source of raw materials, good temperature resistance and low cost

Inactive Publication Date: 2018-05-18
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In view of the deficiencies in the research and practical application of existing drilling fluid viscosity reducers, the problem to be solved in the present invention is to find raw materials with reasonable prices, and then to find a suitable preparation method to synthesize an environmentally friendly anti-salt and anti-calcium Chromium-free viscosity reducer, the viscosity reducer should have the characteristics of environmental friendliness, viscosity reduction and shear reduction ability, salt and calcium resistance, high temperature resistance, low price, etc., and can replace the traditional cost-effective viscosity reducer iron chrome wood Sodium sulfonate (FCLS), used in fresh water, brine, compound brine and deep well, ultra-deep well complex drilling fluid system

Method used

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  • A kind of chromium-free viscosity reducer for oil field drilling fluid and preparation method thereof
  • A kind of chromium-free viscosity reducer for oil field drilling fluid and preparation method thereof
  • A kind of chromium-free viscosity reducer for oil field drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0099] Weigh 50 g of hydrolyzed polyacrylonitrile ammonium salt and dissolve it in 300 mL of water to form an aqueous solution of hydrolyzed polyacrylonitrile ammonium salt. The temperature of the solution was raised to 90°C, continued to stir, added concentrated hydrochloric acid to adjust the pH value to 5, and then Fenton's reagent (2g FeSO 4 +20g H 2 o 2 ) into the reaction system, oxidative degradation 1h, adjust the pH value of the solution to 10 with 10% sodium hydroxide solution, add 5g urea and 5g zinc acetate, cross-linking reaction 0.5h, then add 120g lignite in the reaction solution, wait After reacting for 1 hour, add 5g of acrylic acid and initiator (0.005g of sodium bisulfite and 0.005g of ammonium persulfate), and polymerize for 1.5 hours. The reacted solution is dried at 100°C and pulverized to obtain a sample. Example 1 was tested according to the above chromium-free viscosity reducer evaluation criteria, and the test data are shown in Table 1.

[0100] Tabl...

Embodiment 2

[0103] The difference from Example 1 lies in the types of small molecule monomers added. Specifically, 50 g of hydrolyzed polyacrylonitrile ammonium salt is weighed and dissolved in 300 mL of water to form an aqueous solution of hydrolyzed polyacrylonitrile ammonium salt. The temperature of the solution was raised to 90°C, continued to stir, added concentrated hydrochloric acid to adjust the pH value to 5, and then Fenton's reagent (2g FeSO 4 +20g H 2 o 2 ) into the reaction system, oxidative degradation 1h, adjust the pH value of the solution to 10 with 10% sodium hydroxide solution, add 5g urea and 5g zinc acetate, cross-linking reaction 0.5h, then add 120g lignite in the reaction solution, wait After reacting for 1 hour, add 5g of maleic anhydride and initiator (0.005g of sodium bisulfite and 0.005g of ammonium persulfate), polymerize for 1.5 hours, dry the reacted solution at 100°C, and pulverize to obtain the sample. Example 2 was tested according to the above chromium...

Embodiment 3

[0108] The difference from Example 1 lies in the types of small molecule monomers added. Specifically, 50 g of hydrolyzed polyacrylonitrile ammonium salt is weighed and dissolved in 300 mL of water to form an aqueous solution of hydrolyzed polyacrylonitrile ammonium salt. The temperature of the solution was raised to 90°C, continued to stir, added concentrated hydrochloric acid to adjust the pH value to 5, and then Fenton's reagent (2g FeSO 4 +20g H 2 o 2 ) into the reaction system, oxidative degradation 1h, adjust the pH value of the solution to 10 with 10% sodium hydroxide solution, add 5g urea and 5g zinc acetate, cross-linking reaction 0.5h, then add 120g lignite in the reaction solution, wait After reacting for 1 hour, add 5g of acrylamide and initiator (0.005g of sodium bisulfite and 0.005g of ammonium persulfate), and polymerize for 1.5 hours. The reacted solution is dried at 100°C and pulverized to obtain a sample. Example 3 was tested according to the above chromiu...

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Abstract

The invention relates to an environment-friendly chromium-free viscosity reducer for oilfield drilling fluid and its preparation method and application. The raw material composition of the viscosity reducer includes: synthetic high molecular polymer such as hydrolyzed polyacrylonitrile salt and its Fenton oxidation Degradants, natural polymer materials such as lignite and lignosulfonate, small molecule monomers and initiators, and cross-linking agents. The viscosity reducer of the invention has good viscosity reduction and shear reduction, salt and calcium resistance, and high temperature resistance, and because it does not contain heavy metal chromium ions, the production and use processes are environmentally friendly. Because the viscosity reducer of the present invention has excellent resistance to temperature and salt, it can replace the traditional chromium-containing viscosity reducer-iron chromium lignosulfonate (FCLS), and is applied to fresh water, salt water, compound brine and deep wells, ultra-thin In deep well complex drilling fluid system.

Description

technical field [0001] The invention belongs to the field of treatment agents for oilfield water-based drilling fluids, and in particular relates to an environment-friendly anti-salt, anti-calcium, chromium-free viscosity reducer used in oil drilling, a preparation method and application thereof. Background technique [0002] With the increasing difficulty of global oil exploration and development, more and more deep wells and ultra-deep wells are being drilled, and higher requirements are constantly being placed on drilling fluid as the "drilling blood". During the use of drilling fluid, the network structure formed by the drilling fluid is often strengthened, and the viscosity and shear force of the drilling fluid are increased due to reasons such as temperature rise, salt invasion or calcium invasion, solid phase content increase, or treatment agent failure. If the viscosity and shear force are too large, it will cause difficulty in pumping, difficulty in removing cutting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F291/12C08F291/08C08F291/06C08F220/06C08F222/06C08F220/56C08J3/24C09K8/035C09K8/24
Inventor 周风山孟繁奇薛伟李振华李京忠
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)