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A kind of guar gum fracturing fluid gel breaker and its preparation method and application

A gel breaker and fracturing fluid technology, which is applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems of residue damage to formations, guar gum fracturing fluid gel breaking, equipment pipeline corrosion, etc. The effect of overcoming incomplete glue breaking and solving corrosion problems

Active Publication Date: 2017-04-26
SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The gel breaker usually used in guar gum fracturing fluid is ammonium persulfate, because ammonium persulfate has strong oxidizing ability, it will corrode pipeline equipment, and its ability to release oxygen at low temperature is poor, so it cannot completely break guar gum fracturing fluid , will cause damage to the formation by the residue; in addition, the sulfuric acid radical produced after oxidation will precipitate with the barium and strontium in the formation; ammonium persulfate will also cause corrosion of equipment pipelines

Method used

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  • A kind of guar gum fracturing fluid gel breaker and its preparation method and application
  • A kind of guar gum fracturing fluid gel breaker and its preparation method and application
  • A kind of guar gum fracturing fluid gel breaker and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Solvent: 60 parts (wherein water, methanol, ethanol are respectively 20 parts, 30 parts, 10 parts),

[0029] Oxidase: 10 parts (wherein catalase and superoxide dismutase are respectively 10 parts and 0 parts),

[0030] Amylase: 0.1 part (of which α-amylase, β-amylase and γ-amylase are 0.1 part, 0 part, 0 part respectively),

[0031] Mannanase: 15 parts (of which acid-resistant, alkali-resistant and neutral β-mannanase are 15 parts, 0 parts, 0 parts respectively),

[0032] Tetraacetylethylenediamine: 5 parts,

[0033] Cellulase: 9.9 parts (including 7.9 parts, 2 parts, and 0 parts of exo-β-glucanase, endo-β-glucanase, and β-glucosidase, respectively).

Embodiment 2

[0035] Solvent: 70 parts (wherein water, methanol and ethanol are respectively 60 parts, 10 parts, 0 parts),

[0036] Amylase: 5 parts (of which α-amylase, β-amylase, γ-amylase are 4 parts, 0 parts, 1 part respectively),

[0037] Oxidase: 5 parts (wherein catalase and superoxide dismutase are 5 parts and 0 parts respectively),

[0038] Mannanase: 10 parts (of which acid-resistant, alkali-resistant, and neutral β-mannanase are 5 parts, 0 parts, and 5 parts respectively),

[0039] Tetraacetylethylenediamine: 5 parts,

[0040] Cellulase: 5 parts (including 5 parts, 0 parts, and 0 parts of exo-β-glucanase, endo-β-glucanase, and β-glucosidase, respectively).

Embodiment 3

[0042] Solvent: 75 parts (wherein water, methanol and ethanol are respectively 75 parts, 0 parts, 0 parts),

[0043] Amylase: 5 parts (of which α-amylase, β-amylase, γ-amylase are 4 parts, 0 parts, 1 part respectively),

[0044] Oxidase: 5 parts (wherein catalase and superoxide dismutase are respectively 0 and 5 parts),

[0045] Mannanase: 5 parts (of which acid-resistant, alkali-resistant and neutral β-mannanase are 5 parts, 0 parts, 0 parts respectively),

[0046] Tetraacetylethylenediamine: 5 parts,

[0047] Cellulase: 5 parts (including 5 parts, 0 parts, and 0 parts of exo-β-glucanase, endo-β-glucanase, and β-glucosidase, respectively).

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Abstract

The invention discloses a guar gum fracturing fluid breaker, and a preparation method and an application thereof, and belongs to the field of oilfield fracturing fluids. The preparation method comprises the following steps: adding a solvent to a reaction kettle or a stirrer; starting the stirrer, adding amylase, and reacting for 1-30min; slowly adding oxidase, and reacting for 1-30min; slowly adding mannanase, and reacting for 1-30min; adding an activator, and reacting for 10-60min; adding cellulase, and reacting for 10-60min. The guar gum fracturing fluid breaker is mainly used in oilfield fracturing, and the consumption of the guar gum fracturing fluid breaker is 0.01-3% of the total amount of a fracturing fluid. The guar gum fracturing fluid breaker can overcome the halfway breaking, much residues and damages of barium and strontium precipitates of generated sulfate radicals in stratums to the stratums of breaking using ammonium persulfate, and can also solve the corrosion of ammonium persulfate to pipelines and equipment.

Description

technical field [0001] The invention relates to a gel breaker for guar gum fracturing fluid, a preparation method and application thereof, and belongs to the field of oilfield fracturing fluid. Background technique [0002] The gel breaker usually used in guar gum fracturing fluid is ammonium persulfate. Since ammonium persulfate has a strong oxidizing property, it will corrode pipeline equipment, and its ability to release oxygen at low temperature is poor, so it cannot completely break guar gum fracturing fluid. , will cause damage to the formation by the residue; in addition, the sulfate radical produced after oxidation will precipitate with the barium and strontium in the formation; ammonium persulfate will also cause corrosion of equipment pipelines. Contents of the invention [0003] In order to solve the gel breaking problem of clean fracturing fluid, the object of the present invention is to provide a gel breaking agent for guar gum fracturing fluid that breaks tho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/68C09K8/905C09K2208/24
Inventor 李俊华赵晨云王维喜张建国李杨勇李刚王佳周会强沈燕宾
Owner SHAANXI RES DESIGN INST OF PETROLEUM CHEM IND
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