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Gel foam selective water blockoff agent and use thereof

A technology of gel foam and water blocking agent, which is applied in the preparation of gel foam and the field of high temperature gel foam water blocking agent, can solve the problems that cannot be applied to high temperature oil wells, and achieve enhanced oil recovery, foam stability, and improved washing The effect of oil efficiency

Inactive Publication Date: 2010-11-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing technology can form a foam stabilized by a high-strength polymer network structure, but this polymer gel is prone to degradation at high temperatures and cannot be applied to high-temperature oil wells

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Polyacrylamide (hydrolysis degree 5.3%, molecular weight 8 million) 35%, hexamethylenetetramine 31%, phenol 12%, tetraethylenepentamine 12%, ABS 10%.

[0030] It is formulated into 1.0% aqueous solution and gelled within 72 hours at 120°C, and the gel strength reaches F level. After the gel foam was left for 1d, no change was observed in the foam volume, and the breakthrough pressure was 0.054MPa.

Embodiment 2

[0032] Polyacrylamide (degree of hydrolysis 5.3%, molecular weight 8 million) 30%, hexamethylenetetramine 30%, phenol 10%, tetraethylenepentamine 10%, AOS 20%.

[0033] Formulated into 1.0% aqueous solution, under 120℃ conditions, 48hr gelation, the gel strength reaches F level. After the gel foam was left for 1d, no change in foam volume was observed. The breakthrough pressure is 0.064MPa.

Embodiment 3

[0035] As described in Example 1, the difference is that the foaming agent is AOS.

[0036] Formulated into 1.0% aqueous solution, under 120℃, the gel will form within 20 hours, and the gel strength will reach F level. After the gel foam was left for 1d, no change in foam volume was observed. The breakthrough pressure is 0.065MPa.

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PUM

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Abstract

The invention relates to gel-foam selective plugging agent and the application thereof, belonging to the technical field of oilfield chemistry. The plugging agent comprises the components: 30-50% of acrylamide, 20-40% of hexamethylenetetramine, 5-15% of phenol, 5-15% of tetraethylene pentamine and 5-15% of foaming agent. The aqueous solution with the mass ratio of 0.5-2% can be prepared in site and is injected into a well after being evenly dissolved, so that the plugging agent is used for plugging water in the oil well at the temperature of 90-150 DEG C. The plugging agent uses organic crosslinker for cross bonding polymer to form gel foam under the condition of high temperature, so as to be resistant to the high temperature of 90-150 DEG C and have long period of validity in plugging water.

Description

(1) Technical field [0001] The invention relates to a high-temperature gel foam water plugging agent, in particular to the preparation of a gel foam that can be used for selective water plugging of high-temperature oil wells, and belongs to the technical field of oil field chemistry. (2) Background technology [0002] As oilfield development enters the middle and late stages, water production from oil wells has become increasingly serious. After the oil well produces water, the non-cemented oil layer or the loosely cemented sandstone layer is destroyed, causing sand production in the oil well, reducing the production capacity of the oil well; serious sand production burying the oil layer, or causing the oil layer to collapse, causing the oil well to stop production. Premature water breakthrough in oil wells will result in the formation of some dead oil areas underground, thus greatly reducing the recovery rate of the oil reservoir; a large amount of water is produced from oil wel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/42C09K8/60
Inventor 王彦玲赵修太邱广敏刘德新胡娟倪洁郑晶晶李海涛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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