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Expansion type flow gel profile controlling water shutoff agent

A technology of profile control and water plugging agent and gel, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of insufficient formation plugging, poor salt resistance and temperature resistance, and short delayed crosslinking, etc., to achieve Increase the water absorption expansion multiple, increase the salt resistance and temperature resistance, and increase the effect of delayed crosslinking

Inactive Publication Date: 2007-09-12
盘锦市庆联油田工程技术服务有限公司
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AI Technical Summary

Problems solved by technology

[0002] With the continuous deepening of oilfield water injection development, many oilfields are already in the development stage of medium and high water cut periods. The expansion of profile control and water shutoff agents used in the prior art is low: formation plugging is not sufficient, and the effect of profile control and water shutoff is poor; Short delayed cross-linking: unable to meet the needs of high-dose profile control, water plugging and flood control; poor salt and temperature resistance: unable to meet the needs of high-temperature and high-salt oilfields

Method used

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  • Expansion type flow gel profile controlling water shutoff agent
  • Expansion type flow gel profile controlling water shutoff agent

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Embodiment Construction

[0014] Mix the solution concentration of 0.12% of polymer polyacrylamide (molecular weight: 23-25 ​​million) with 0.4% of boron modified phenolic resin delayed crosslinking agent, control the gel reaction temperature to 80°C, and the pH value of the solution system to be 7.5.

[0015] Wherein the boron modified phenolic resin delayed crosslinking agent processing and preparation process is as follows:

[0016] 1. Feed according to the molar ratio of phenol and formaldehyde 1:5.2, first add phenol, then add caustic soda according to 0.8% of the total amount of pure phenol and formaldehyde, and control the temperature at 50°C for 15 minutes.

[0017] 2. Add 80% of the total amount of formaldehyde, and control the temperature to react for 40 minutes under the conditions of 55°C and ph=9. At this time, the reaction solution was light red.

[0018] 3. Add caustic soda according to 0.2% of the total amount of pure phenol and formaldehyde, then add the remaining 20% ​​formaldehyde, ...

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Abstract

The invention relates to a method for increasing oil recovery, which especially relates to of an expansion mobile profile control gel blocking agent. The agent significantly improves its specification regarding water swelling, delay-crosslinking, salt tolerance and temperature. In the invention, it mixes the high polymer polyacrylamide solution with a density of 0.07%~0.2% and boron modified phenolic resin delay-crosslinking agent of 0.05% -0.8%, and controls reaction temperature of gel at 40-100deg.C, and controls the pH value of the solution at 7.2~8.0.

Description

technical field [0001] The invention relates to a method for increasing oil recovery used in oilfield production, in particular to an expanding flow gel profile control and water shutoff agent. Background technique [0002] With the continuous deepening of oilfield water injection development, many oilfields are already in the development stage of medium and high water cut periods. The expansion of profile control and water shutoff agents used in the prior art is low: formation plugging is not sufficient, and the effect of profile control and water shutoff is poor; Short delayed cross-linking: cannot meet the needs of high-dose profile control, water plugging and flood control; poor salt and temperature resistance: cannot meet the needs of high-temperature and high-salt oilfields. Only by improving the comprehensive performance of the gel can it meet the needs of large-dose profile control, water shutoff and flood control in different oil fields, and profile control and wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/60
Inventor 霍春光徐进曹俊威
Owner 盘锦市庆联油田工程技术服务有限公司
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