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Viscosity-variable diverting acid for improving stratigraphic acidified section

A technology of turning to acid and profile, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of uniform acidification of difficult acid liquid, and achieve the effects of low surface tension, increased seepage resistance and stable performance

Inactive Publication Date: 2011-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acidification diverting agent provided by the above-mentioned documents is difficult to make the acid liquid enter the middle and low permeability layers to achieve uniform acidification

Method used

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  • Viscosity-variable diverting acid for improving stratigraphic acidified section

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: A viscosity-increasing diverting acid for improving formation acidification profiles, which mainly contains the following components: 100 parts of basic acid liquid; 3.5 to 4.2 parts of long-chain alkyl amidopropyl betaine; 1.6 to 2.2 parts of corrosion inhibitor ; 0.7-0.85 parts of iron ion stabilizer; 0.75-0.92 parts of clay stabilizer. According to the numerical range of the above-mentioned content of each component, one of them is selected, and the components are combined and formulated.

Embodiment 2

[0016] Embodiment 2: A kind of viscous diversion acid that improves formation acidification profile, its preferred combination scheme is: basic acid liquid is 100 parts of dilute hydrochloric acid of mass concentration 15%-18%; Contains the oil of eighteen carbon chain hydrophobic bases 3.5-3.8 parts of acid amidopropyl betaine; 1.8 parts of pyridine quaternary ammonium acidification corrosion inhibitor; 0.8 parts of acetic acid complex iron ion stabilizer; 0.5 parts of polyquaternary ammonium small cationic clay stabilizer, initial viscosity 10- 12mPa.s. In this plan, it is best to choose dilute hydrochloric acid basic acid solution with a mass concentration of 15%-18%; oleic acid amidopropyl betaine with 18 carbon chain hydrophobic groups; corrosion inhibitor CRS-6 of pyridine quaternary ammonium salts; acetic acid Iron-like ion stabilizer NTS-2; polyquaternary amine small cationic clay-like stabilizer BCS-851; the viscosity-changing steering acid of this preferred combinati...

Embodiment 3

[0017] Embodiment 3: A kind of viscous diversion acid that improves formation acidizing profile, its optimal combination plan is: the base acid liquid is the dilute hydrochloric acid that contains mass concentration 10%-12% and the hydrofluoric acid of mass concentration 2%-3% 100 parts of clay acid; 4-4.5 parts of erucamide propyl betaine containing 22 carbon chain hydrophobic groups; 1.5 parts of pyridine quaternary ammonium salt corrosion inhibitor; 0.9 parts of acetic acid complex iron ion stabilizer ; 0.5 part of polyquaternary amine small cationic clay stabilizer; 0.5 part of high-efficiency drainage aid of fluorocarbon surfactant, initial viscosity 11-13mPa.s. In this solution, 0.5 part of fluorocarbon surfactant-based high-efficiency drainage aid is added, which is more conducive to the flowback of residual acid. The viscous turning acid of this optimal combination scheme is at 20°C for 100s -1 The apparent viscosity measured by Brookfield DV-III rotational viscometer...

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Abstract

The invention discloses viscosity-variable diverting acid for improving a stratigraphic acidified section. An oil layer is uniformly acidified, and the coning of acid liquor in a high permeable stratum is reduced to ensure that part of acid liquor enters middle and low permeable target stratums so as to improve and expand an acidified sweep section. In the viscosity-variable diverting acid, each component is controlled by a pH value, and the viscosity-variable diverting acid mainly comprises the following components in part by weight: 100 parts of basic acid liquor, 3 to 5 parts of long chain alkylamide propyl betaine, 1 to 3 parts of corrosion inhibitors, 0.5 to 1 part of ferrous stabilizer and 0.5 to 1 part of clay stabilizer. The viscosity-variable diverting acid consisting of the components is injected into a target oil layer. In the acidification process, the initial viscosity of the acid liquor is lower, and the initial viscosity at the temperature of 20 DEG C is 10 to 15mPa.s, the acid liquor is easy to enter the high permeable stratum, and subsequent unreacted low-viscosity acid liquor automatically diverts to enter the middle and low permeable stratums. The long chain alkylamide propyl betaine serving as a diverter is an ampholytic surfactant, does not have any macromolecular residues after a gel is broken and does not have any secondary damage to a reservoir.

Description

technical field [0001] The invention relates to an acidizing preparation for underground oil layers in the petroleum industry, in particular to a viscous diverting acid that improves the acidizing profile of the formation, realizes uniform acidizing of the oil layer, reduces the coning of the acid liquid in the high-permeability layer, and allows part of the acid liquid to enter the middle and low Infiltrate the target layer to improve and expand the sweeping profile of acidification. Background technique [0002] In the petroleum industry, acidizing is an effective method for increasing the production of oil and gas wells. Turning to acid can prevent the acid liquid from only entering the high-permeability layer with low seepage resistance, and can balance the flow of acid liquid so that all oil layers can contact with the acid liquid to achieve uniform acidification. This type of steering acid in the prior art has been disclosed in the following patent documents. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
Inventor 马代鑫徐赋海王增林隋春艳王德山黄敏董保春陈庆华刘小波郝恒泽
Owner CHINA PETROLEUM & CHEM CORP
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