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Modified starch and preparation method thereof, microbubble drilling fluid and application

A drilling fluid and starch technology, applied in chemical instruments and methods, drilling compositions, geothermal power generation, etc., can solve the problems of insufficient temperature resistance, unsatisfactory salt and calcium resistance effects, and high use costs, and achieve excellent Effects of water solubility, strong shear thinning and rock-carrying ability, and excellent high temperature foam stabilization

Active Publication Date: 2022-03-01
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a modified starch and its preparation in order to overcome the problems of insufficient temperature resistance, unsatisfactory anti-salt and anti-calcium effect and high cost of use of the microfoam drilling fluid foam stabilizer in the prior art. Method, microbubble drilling fluid and application

Method used

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  • Modified starch and preparation method thereof, microbubble drilling fluid and application
  • Modified starch and preparation method thereof, microbubble drilling fluid and application
  • Modified starch and preparation method thereof, microbubble drilling fluid and application

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preparation example Construction

[0027] The first aspect of the present invention provides a kind of preparation method of modified starch, the method comprises:

[0028] (1) Starch and water are made into a gelatinized starch solution, and the first monomer, the second monomer, and the third monomer are made into a monomer solution with water, and then the gelatinized starch solution and the monomer solution are Mix with a hydrophilic emulsifier to obtain an aqueous phase solution;

[0029] (2) mixing the lipophilic emulsifier with liquid paraffin and emulsifying to obtain an oil phase solution; adding the water phase solution to the oil phase solution to obtain a water-in-oil type inverse emulsion system;

[0030] (3) In the presence of an initiator, the water-in-oil type inverse emulsion system is subjected to a graft copolymerization reaction to obtain a reaction product system;

[0031] (4) The reaction product system is subjected to demulsification, washing and subsequent treatment to obtain modified s...

preparation example 1

[0067] (1-A) Dissolve the soluble starch in deionized water, and use a magnetic heating stirrer to heat and stir at 90° C. for 0.75 h to perform pregelatinization treatment to obtain a transparent gelatinized starch solution (concentration: 30% by weight) ;

[0068] (1-B) Weigh the grafted monomers NVP, AMPS, AM according to the monomer molar ratio 1:2:4 and dissolve them in deionized water to obtain a monomer solution (the total concentration of each monomer is 60% by weight), and then use NaOH aqueous solution adjusts the pH value of the monomer solution to 8;

[0069] (1-C) Mix the above-mentioned gelatinized starch solution with the monomer solution, and then add Triton X-100 to continue mixing to obtain an aqueous phase solution;

[0070] In the above steps, the weight ratio of soluble starch: (NVP+AMPS+AM) is 50:100; the weight ratio of Triton X-100: (NVP+AMPS+AM) is 3:100;

[0071] (2) Dissolve Span 80 in liquid paraffin, use a high-speed shear emulsifier to stir, mix...

preparation example 2

[0078] (1-A) Dissolve the soluble starch in deionized water, and use a magnetic heating stirrer to heat and stir at 85° C. for 0.5 h to perform pregelatinization treatment to obtain a transparent gelatinized starch solution (concentration: 30% by weight) ;

[0079] (1-B) Weigh the grafted monomers NVP, AMPS, AM according to the monomer molar ratio 1:4:6 and dissolve them in deionized water to obtain a monomer solution (the total concentration of each monomer is 60% by weight), and then use NaOH aqueous solution adjusts the pH value of the monomer solution to 7.5;

[0080] (1-C) Mix the above-mentioned gelatinized starch solution with the monomer solution, and then add Triton X-100 to continue mixing to obtain an aqueous phase solution;

[0081] In the above steps, the weight ratio of soluble starch: (NVP+AMPS+AM) is 50:100; the weight ratio of Triton X-100: (NVP+AMPS+AM) is 16:100;

[0082] (2) Dissolve Span 80 in liquid paraffin, use a high-speed shear emulsifier to stir, m...

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Abstract

The invention relates to the field of oil exploitation, and discloses modified starch, a preparation method thereof, a microbubble drilling fluid and application. The preparation method comprises the following steps: (1) preparing starch and water into a gelatinized starch solution, preparing a first monomer, a second monomer, a third monomer and water into a monomer solution, and then mixing the gelatinized starch solution, the monomer solution and a hydrophilic emulsifier to prepare a water-phase solution; (2) mixing an oleophylic emulsifier with liquid paraffin, and emulsifying to obtain an oil phase solution; adding the aqueous phase solution into the oil phase solution to prepare a water-in-oil type inverse emulsion system; (3) in the presence of an initiator, carrying out graft copolymerization reaction on the water-in-oil type inverse emulsion system to obtain a reaction product system; and (4) carrying out demulsification, cleaning and subsequent treatment on the reaction product system to obtain the modified starch. The modified starch has excellent high-temperature foam stabilizing performance, can resist the temperature of 180 DEG C, and has better salt and calcium resistance.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a modified starch, a preparation method thereof, a microbubble drilling fluid and an application thereof. Background technique [0002] Drilling fluid is a circulating fluid that plays the role of carrying cuttings, stabilizing the well wall, balancing formation pressure, cooling and lubricating drilling tools, etc. in oil and gas, coal seam, geothermal and other drilling projects. Lost circulation is a major drilling problem that needs to be solved urgently when formations with complex geological conditions such as strata and fractured or unconsolidated sandstone reservoirs are developed. In recent years, a near-balanced drilling technology using recyclable microbubble drilling fluid can realize negative pressure drilling in low-pressure formations, and effectively solve the problems of serious lost circulation and differential pressure sticking. The advantages of this tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F226/10C08F220/58C08F220/56C08F212/14C08F228/02C08F220/54C08F226/04C08F2/32C09K8/035C09K8/24
CPCC08F251/00C08F2/32C09K8/035C09K8/24C08F226/10C08F220/585C08F220/56C08F212/30C08F228/02C08F220/54C08F226/04Y02E10/10
Inventor 朱文茜郑秀华
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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