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Acidification diverter composition

A technology of acidification diversion and composition, which is applied in the direction of drilling composition, chemical instruments and methods, etc. It can solve the problems of high viscosity of residual acid, difficulty in flowback of residual acid, unsatisfactory diversion effect, etc., and achieve low viscosity of residual acid , fast acid rock reaction rate, and enhanced steering effect

Inactive Publication Date: 2014-04-09
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used acidifying diverting agent, betaine, begins to gradually increase in viscosity when the HCl concentration is very low, that is, when the pH value is high, and the viscosity increases to the maximum value, and then basically remains unchanged, that is, the viscosity of the residual acid is very large.
This makes the turning effect unsatisfactory during the acidification process, and it is difficult to flow back the residual acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Composition of acidifying diverting agent:

[0034] Additive to control steering acid viscosity: erucamidopropyldimethylamine 44% by weight,

[0035]Co-solvent: 32% by weight of ethanol, 20% by weight of ethylene glycol,

[0036] Additives for improving temperature resistance: stearic acid amidopropyl dimethylamine 0% by weight,

[0037] Additive for adjusting the position of the peak viscosity of the steering acid: 4% by weight of lauric amidopropyldimethylamine.

Embodiment 2

[0039] Composition of acidifying diverting agent:

[0040] Additive to control steering acid viscosity: erucamidopropyldimethylamine 44% by weight,

[0041] Co-solvent: 30% by weight of ethanol, 20% by weight of ethylene glycol,

[0042] The additive that improves temperature resistance performance: 2% by weight of stearic acid amidopropyl dimethylamine,

[0043] Additive for adjusting the position of the peak viscosity of the steering acid: 4% by weight of lauric amidopropyldimethylamine.

Embodiment 3

[0045] Composition of acidifying diverting agent:

[0046] Additive to control steering acid viscosity: erucamidopropyldimethylamine 43% by weight,

[0047] Co-solvent: 28% by weight of ethanol, 20% by weight of ethylene glycol,

[0048] The additive that improves temperature resistance performance: 5% by weight of stearic acid amidopropyl dimethylamine,

[0049] Additive for adjusting the position of the peak viscosity of the steering acid: 4% by weight of lauric amidopropyldimethylamine.

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Abstract

The invention relates to an acidification diverter composition which is used for enhancing the acidification effect of a non-homogeneous oil-gas reservoir. The acidification diverter composition basically comprises the following components: (A) 40-50 wt% of additive for controlling the viscosity of diverted acid; (B) 48-60 wt% of cosolvent; (C) 2-5 wt% of additive for adjusting the position of peak viscosity of the diverted acid; and (D) 0-5 wt% of additive for improving temperature resistance. Since the viscosity of the diverted acid based on the composition is sensitive to the concentration of HCl (hydrogen chloride), the concentration of HCl required when the peak viscosity is reached is adjustable, and the viscosity can reach the maximum value under a higher HCl concentration and then gradually reduced to be lower than 10mPa.s with the decrease of the HCl concentration, therefore flowback can be realized without additional gel breaker reacted acid.

Description

technical field [0001] The invention relates to an acidizing diverting agent composition, which is an additive for enhancing the acidizing effect of low-permeability reservoirs in acid liquid during the acidizing construction process of heterogeneous oil and gas reservoirs. More particularly, the viscosity of the diverting acid based on the acidizing diverting agent composition of the present invention is sensitive to the concentration of HCl, as long as the diverting acid reacts with the minerals in the formation to reduce the concentration of HCl, the viscosity of the diverting acid will gradually increase to the maximum, and simultaneously The position of the peak viscosity can be adjusted, and then the viscosity gradually decreases, that is, the residual acid viscosity is very small. Background technique [0002] Acidizing is an effective technical measure for increasing production of oil and gas wells and increasing injection of injection wells. It is to inject one or ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 邱海燕王顺慧杨旭何伟王彬
Owner SOUTHWEST PETROLEUM UNIV
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