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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 directions of drilling compositions, chemical instruments and methods, etc., can solve problems such as inability to apply high temperature oil wells, and achieves improved crude oil recovery, stable foam, and improved oil washing efficiency. Effect

Inactive Publication Date: 2009-07-15
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] Mixed into 1.0% aqueous solution, under the condition of 120 ℃, 72 hours into a gel, the gel strength reaches F grade. The gel foam was placed for 1 day, no change in the foam volume was observed, and the breakthrough pressure was 0.054MPa.

Embodiment 2

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

[0033] Mixed into 1.0% aqueous solution, under the condition of 120 ℃, 48 hours into a gel, the gel strength reached grade F. The gel foam was left for 1 day, and no change in the foam volume was observed. The breakthrough pressure is 0.064MPa.

Embodiment 3

[0035] As described in Example 1, except that the blowing agent is AOS.

[0036] Mixed into 1.0% aqueous solution, under the condition of 120 ℃, 20hr into gel, the gel strength reaches F grade. The gel foam was left for 1 day, and no change in the 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 cross linker 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 shutoff agent, in particular to the preparation of a gel foam that can be used for selective water shutoff in high temperature wells in oilfields, and belongs to the technical field of oilfield chemistry. (2) Background technology [0002] As oilfield development enters the middle and late stages, the water production situation of oil wells is becoming more and more serious. After the oil well produces water, the non-cemented oil layer or the loosely cemented sandstone layer will be damaged, resulting in sand production in the oil well, which reduces the production capacity of the oil well; serious sand production will bury the oil layer, or cause the oil layer to collapse, resulting in the shutdown of the oil well. Premature water breakthrough in the oil well will lead to the formation of some dead oil areas underground, thus greatly reducing the recovery rate of the oil reservoir; a large...

Claims

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Application Information

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Patent Type & Authority Applications(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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