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A composite temperature-resistant viscoelastic self-steering acid and its preparation method and application

A self-steering acid, viscoelastic technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc. Liquid convenient effect

Active Publication Date: 2019-07-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through indoor research, it is found that this system is only suitable for low temperature wells, not for medium and high temperature wells

Method used

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  • A composite temperature-resistant viscoelastic self-steering acid and its preparation method and application
  • A composite temperature-resistant viscoelastic self-steering acid and its preparation method and application
  • A composite temperature-resistant viscoelastic self-steering acid and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] This embodiment provides a compound high temperature resistant viscoelastic self-steering acid, in terms of mass percentage:

[0109] Thickener A: cocamidopropyl betaine 4wt.%;

[0110] Thickener B: erucamide propyl sulfobetaine 2wt.%;

[0111] 31wt.% concentrated hydrochloric acid: 48.4wt.%;

[0112] Corrosion inhibitor: Chloride-1,6-(α-octylpyridine) hexane 3.0wt.%;

[0113] Iron ion stabilizer: iron citrate ion stabilizer 4.5wt.%;

[0114] KCl: 3.5wt.%;

[0115] The balance is water.

[0116] The specific preparation process is:

[0117] According to the above ratio, add cocamidopropyl betaine to water at 25°C to fully dissolve, and cannot be dissolved in acid first, and erucamide propyl sulfobetaine is added to 31% concentrated hydrochloric acid to fully dissolve, cannot be dissolved first into water, then mix the two solutions, add pyridinium quaternary ammonium salt corrosion inhibitor -1,6-(α-octylpyridine) hexane chloride and ferric citrate ion stabilizer,...

Embodiment 2

[0123] This embodiment provides a composite temperature-resistant viscoelastic self-steering acid, in terms of mass percentage:

[0124] Thickener A: Cocamidopropyl Betaine 4wt.%;

[0125] Thickener B: erucamidopropyl betaine 2wt.%;

[0126] 31wt.% concentrated hydrochloric acid: 65.5wt.%;

[0127] Corrosion inhibitor: oleic acid imidazoline 3.5wt.%;

[0128] Iron ion stabilizer: edetate sodium salt iron ion stabilizer 4%;

[0129] KCl: 3.5wt.%;

[0130] The balance is water.

[0131] The specific preparation process is:

[0132] According to the above ratio, add cocamidopropyl betaine to water at 25°C to fully dissolve it, and cannot dissolve it in the acid solution first; add erucamide propyl betaine to 31% concentrated hydrochloric acid to fully dissolve it, and cannot dissolve it first In the water, mix the two solutions, add imidazoline corrosion inhibitor oleic acid imidazoline and ethylenediaminetetramate sodium salt iron ion stabilizer, stir evenly, and you can g...

Embodiment 3

[0138] This embodiment provides a composite temperature-resistant viscoelastic self-steering acid, in terms of mass percentage:

[0139] Thickener A: octadecyl dimethyl hydroxypropyl sulfobetaine 3wt.%;

[0140] Thickener B: erucamide propyl sulfobetaine 2wt.%;

[0141] 31wt.% concentrated hydrochloric acid: 48.4wt.%;

[0142] Corrosion inhibitor: Chloride-1,6-(α-octylpyridine)hexane 3.0wt.%;

[0143] Iron ion stabilizer: iron citrate ion stabilizer 4.5wt.%;

[0144] KCl: 2.5wt.%;

[0145] The balance is water.

[0146] The specific preparation process is:

[0147] According to the above ratio, add octadecyl dimethyl hydroxypropyl sultaine into water to fully dissolve at 25°C, add erucamide propyl sultaine to 31% concentrated hydrochloric acid to fully dissolve, and then add the two Mix the two solutions, add pyridine quaternary ammonium salt corrosion inhibitor -1,6-(α-octylpyridine) hexane chloride and ferric citrate ion stabilizer, stir evenly, and you can get a compo...

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Abstract

The invention relates to compound type temperature-resisting viscoelastic self-diverting acid as well as a preparation method and application thereof. The self-diverting acid is prepared from 1.0 to 7.5 weight percent of thickening agent A, 1.0 to 7.5 weight percent of thickening agent B, 32.2 to 75.5 weight percent of concentrated hydrochloric acid, 1.0 to 4.0 weight percent of corrosion inhibitor, 1.5 to 5.0 weight percent of ferric ion stabilizer, 1.5 to 4.0 weight percent of clay stabilizer and the balance of water; the thickening agent A is prepared from one or more of cocamidopropyl betaine, octadecyl dimethyl hydroxypropyl betaine and lauramidopropyl betaine; the thickening agent B is prepared from one or more of erucamide propyl betaine, docosyl dimethyl betaine and erucamide propylsulfobetaine. The self-diverting acid disclosed by the invention is suitable for a carbonate reservoir with the temperature of 80 to 120 DEG C.

Description

technical field [0001] The invention relates to a composite temperature-resistant viscoelastic self-steering acid and its preparation method and application, belonging to the technical field of oil and gas exploitation. Background technique [0002] With the continuous exploration and development of oilfields at home and abroad, a large number of deep low-permeability heterogeneous reservoirs have been exploited. For low-permeability oil and gas fields that require production stimulation operations, acidizing is one of the commonly used measures to increase production. The acid fluid reacts with rocks to dissolve formation rocks and produce acid-eroded pores, which can allow oil and gas to flow into the production wellbore and improve the relationship between the wellbore and the near-wellbore reservoir. Connectivity to increase well productivity. In reservoirs with strong heterogeneity, the flow of acid liquid follows the principle of least resistance. During the acidifica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74E21B43/26
CPCC09K8/602C09K8/74C09K2208/30E21B43/26
Inventor 曾双红吴志俊张子明徐乐李超李军陈小凯田浩刘锦江郭琳李玉印李霞孟丽华
Owner PETROCHINA CO LTD
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