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Visco-elastic acid-based fracturing fluid and preparation method thereof

A fracturing fluid and viscoelastic technology, which is applied in the field of viscoelastic acid-based fracturing fluid and its preparation, can solve problems such as the inability to reduce the damage of polymers to formations, and achieve improved seepage capacity, increased acidification range, and high viscosity. Effect

Active Publication Date: 2018-06-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cross-linked acid-based fracturing fluid system cannot reduce the damage of the polymer to the formation because the thickener is a polymer material and heavy metals such as a cross-linking agent need to be added.

Method used

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  • Visco-elastic acid-based fracturing fluid and preparation method thereof
  • Visco-elastic acid-based fracturing fluid and preparation method thereof
  • Visco-elastic acid-based fracturing fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] This embodiment provides an acid-based fracturing fluid, in terms of mass percentage:

[0041] Thickener: Dioctadecyldimethylammonium chloride 7.5wt.%

[0042] 31wt.% concentrated hydrochloric acid: 50.0wt.%

[0043] Counter ion salt: sodium lauryl sulfate 0.5wt.%

[0044] Corrosion inhibitor: bicyclic imidazoline 0.5wt.%

[0045] Iron ion stabilizer: EDTA sodium salt iron ion stabilizer 1.5wt.%

[0046] The balance is water.

[0047] The specific preparation process is:

[0048] According to the above ratio, dioctadecyl dimethyl ammonium chloride was added into water to fully dissolve at room temperature, and the corrosion inhibitor bicyclic imidazoline 3, ethylenediaminetetraacetic acid sodium salt iron ion stabilizer, 31wt.% Concentrated hydrochloric acid to obtain an acidic thickener solution, the counter ion salt sodium lauryl sulfate was dissolved in water, and then the two solutions were mixed and stirred evenly to obtain a viscoelastic acid-based fracturing...

Embodiment 2

[0064] This embodiment provides an acid-based fracturing fluid, in terms of mass percentage:

[0065] Thickener: lauryl amidopropyl betaine 7.5wt.%

[0066] 37wt.% concentrated hydrochloric acid: 50wt.%

[0067] Counter ion salt: Potassium chloride 2.5wt.%

[0068] Corrosion inhibitor: imidazoline oleate 2.5wt.%

[0069] Iron ion stabilizer: erythorbate iron ion stabilizer 4.5wt.%

[0070] The balance is water.

[0071] The specific preparation process is:

[0072] According to the above proportions, under normal temperature, lauryl amidopropyl betaine is added into water to fully dissolve, and the corrosion inhibitor oleic acid imidazoline, erythorbate iron ion stabilizer, and 37wt.% concentrated hydrochloric acid are added successively to obtain an acidic thickener solution. The ionic salt potassium chloride was dissolved in water, and then the two solutions were mixed and stirred evenly to obtain a viscoelastic acid-based fracturing fluid system. The data are shown in ...

Embodiment 3

[0088] This embodiment provides an acid-based fracturing fluid, in terms of mass percentage:

[0089] Thickener: Behenyltrimethylammonium Chloride 4wt.%

[0090] 31wt.% concentrated hydrochloric acid: 75.0wt.%

[0091] Counter ion salt: sodium benzoate 2.5wt.%

[0092] Corrosion inhibitor: bromide-1,4(a-octylpyridine)butane 2.5wt.%

[0093] Iron ion stabilizer: ferric citrate stabilizer 5.0wt.%

[0094] The balance is water.

[0095] The specific preparation process is:

[0096] According to the above ratio, add behenyltrimethylammonium chloride into water to fully dissolve at room temperature, and then add corrosion inhibitor bromide-1,4(a-octylpyridine)butane and ferric citrate ion to stabilize % concentrated hydrochloric acid to obtain an acidic thickener solution, the counter ion salt sodium benzoate was dissolved in water, and then the two solutions were mixed and stirred evenly to obtain a viscoelastic acid-based fracturing fluid system. The data are shown in Table ...

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Abstract

The invention provides a visco-elastic acid-based fracturing fluid and a preparation method thereof. The visco-elastic acid-based fracturing fluid comprises, by weight, 2.0 to 7.5 parts of a thickening agent, 50.0 to 75.0 parts of concentrated hydrochloric acid with a concentration of 31 to 37 wt% , 0.5 to 2.5 parts of counter ion salt, 0.5 to 2.5 parts of a corrosion inhibitor and 1.5 to 5.0 parts of an iron ion stabilizing agent. The visco-elastic acid-based fracturing fluid is highly acid, resistant to high temperature, high in viscosity, capable of realizing automatic gel breaking and freeof residues in a gel breaking solution, and has the advantages of simple raw materials, low cost, convenient fluid preparation, etc.

Description

technical field [0001] The invention relates to a viscoelastic acid-based fracturing fluid and a preparation method thereof, belonging to the technical field of oil and gas exploitation. Background technique [0002] The hydraulic-sand composite fracturing technology integrated with fracturing and acidification can form fractures with high conductivity. At present, the commonly used fracturing fluid is water-based fracturing fluid. The higher the viscosity of the fracturing fluid, the better the sand-carrying performance. The water-based fracturing fluid mainly uses the thickener guar gum and the cross-linking agent borax to cross-link under alkaline conditions, etc. , the molecular weight of guar gum is greater than 1 million, and the macromolecular substances of guar gum are easy to adsorb and block the reservoir fluid seepage channels, fracturing fluid residues block the propped fractures, and the filter cake also causes damage to the fracture wall. In recent years, a lo...

Claims

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Application Information

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IPC IPC(8): C09K8/60C09K8/74
CPCC09K8/602C09K8/74C09K2208/28C09K2208/30
Inventor 曾双红李军郭琳李玉印李霞包放田浩刘锦江陈小凯张晨曦孟丽华关伟赵烨周坤
Owner PETROCHINA CO LTD
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