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A recyclable instant thickening acid

A thickening acid, instant technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of non-recycling, long thickening time of thickening acid, etc. fast effect

Active Publication Date: 2017-07-25
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the thickened acid thickens for a long time and cannot be recycled and reused
[0005] At present, domestic research and application reports on the recovery of surfactant-thickened acid systems have not yet appeared, so the development and application of surfactant-thickened acid direct mixing and residual acid reuse technologies have good application prospects

Method used

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  • A recyclable instant thickening acid
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  • A recyclable instant thickening acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment provides a recyclable instant thickening acid, which is formulated by the following components according to the following mass component ratios:

[0026] Thickener: 1.5 parts;

[0027] Potassium chloride: 0.5 parts;

[0028] Hydrochloric acid solution: 100 parts.

[0029] The above thickener is a mixture of 55% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 8% ethanol and 37% water by mass ratio .

[0030] The mass concentration of the above-mentioned hydrochloric acid solution is 15%.

[0031] The thickening time of this recyclable instant thickening acid is less than 30s, and the viscosity is at least 60mPa·s under normal ground temperature; when the ground temperature is greater than 105°C, the viscosity is ≤15 mPa·s; at 120°C, the viscosity is ≤5 mPa ·s.

[0032] A recyclable instant thickening acid prepared in this example was used for acidification. After inspection and measurement, the thicken...

Embodiment 2

[0034] The present embodiment provides a recyclable instant thickening acid, which is formulated by the following components according to the following mass component ratios:

[0035] Thickener: 2 parts;

[0036] Potassium chloride: 1 part;

[0037] Hydrochloric acid solution: 100 parts.

[0038] The above thickener is a mixture of 48% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 10% ethanol and 42% water by mass ratio .

[0039] The mass concentration of the above-mentioned hydrochloric acid solution is 20%.

[0040] The thickening time of the recyclable instant thickening acid in this example is less than 30s, and the viscosity is at least 60mPa·s under normal ground temperature conditions, and the viscosity is ≤15 mPa·s when the formation temperature is greater than 105°C, and the viscosity is ≤15mPa·s when the formation temperature is greater than 120°C When the viscosity is less than or equal to 5mPa·s.

[0041] A recyclab...

Embodiment 3

[0043] The present embodiment provides a recyclable instant thickening acid, which is formulated by the following components according to the following mass component ratios:

[0044] Thickener: 2.5 parts;

[0045] Potassium chloride: 2 parts;

[0046] Hydrochloric acid solution: 100 parts.

[0047] The above thickener is a mixture of 63% N-lauroyl-N'-hydroxyethyl-N'-carboxypropyl ethylenediamine propionate or its derivatives, 6% ethanol and 31% water by mass ratio .

[0048] The mass concentration of the above-mentioned hydrochloric acid solution is 25%.

[0049] A recyclable instant thickened acid prepared in this example was used for acidification. After inspection and measurement, the thickened acid prepared under normal ground temperature (25°C) had a thickening time of 18s and a viscosity of 80mPa·s. The ability reaches 107°C, which is in line with the repeated acidification operation conditions of the present invention. Compared with Example 1 and Example 2, the tem...

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Abstract

The invention relates to a recoverable instant thickening acid, mainly applied to the recycling and reusing production stimulation operation of gas well carbonate reservoir acidizing fluid. The recoverable instant thickening acid is prepared by the following components in parts by weight: 1.5-3 parts of thickening agent, 0.5-3 parts of potassium chloride and 100 parts of hydrochloric acid solution, wherein the thickening agent is the mixture of 40%-70% of N-lauroyl-N'-ethoxyl-N'-carboxy propyl propionate ethylenediamine or derivatives thereof, 4-12% of ethyl alcohol and 18-56% of water. After the thickening acid is adopted for performing acidification construction, residual acid liquor can be prepared into the acid liquor again to be applied to acidification construction without chemical treatment, the green and environment-friendly production and sustainable development of gas fields are ensured; the research result has significant economic benefit as well as important social benefit, and has very great application prospect.

Description

technical field [0001] The invention relates to a recyclable instant thickened acid, which is mainly used for recyclable and reused acidification fluid of gas well carbonate rock reservoir for production stimulation and reformation. Background technique [0002] Thickened acid is the main acid system for acid fracturing of paleo-carbonate reservoirs in the Changqing gas field. It has high viscosity, good slowing speed and fracture-making performance, long acid etching distance and good stimulation effect. However, the thickened acid currently used in the Changqing gas field has problems such as that the residual acid solution cannot be recycled after acidification, and the thickening time of the solution is long. [0003] Since Schlumberger Dowell launched clean fracturing fluid based on viscoelastic surfactants in 1997, viscoelastic surfactant technology has been widely used and promoted in oil and gas field stimulation measures. Domestic reports on clean fracturing fluids...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 孙虎王祖文张冕高燕邵秀丽李婧王改红袁冬蕊景志明徐俊芳
Owner BC P INC CHINA NAT PETROLEUM CORP