Method for preparing environmental-friendly type gel profile control agent

A profile control agent and an environment-friendly technology, which is applied in the field of preparation of an environment-friendly gel profile control agent, can solve the problems of increasing the load of a dehydration station, environmental pollution, environmental impact, etc., and achieves low cost, reduced production cost, and good stability. Effect

Inactive Publication Date: 2014-10-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many hazards in the oilfield effluent, such as the consumption of formation energy, the reduction of the pump efficiency of the pumping well, the aggravation of the corrosion and scaling of the pipeline equipment, and the increase of the load of the dehydration station. If it is not reinjected, it will have an impact on the environment, the separation and Processing also increases oil recovery costs
With the continuous deepening of oilfield exploitation, conventional water plugging profile control agents can no longer meet the normal production needs of oilfields. Conventional gel profile control agents can achieve better application results when used in low-temperature and low-salinity reservoirs. The long-term stability and plugging strength are poor in high-temperature and high-salinity reservoirs, which cannot meet the requirements of profile control
At the same time, cross-linking agents such as potassium dichromate, aluminum citrate, various chromium salts and organic cross-linking agents such as phenol and formaldehyde used in commonly used gel profile control systems have certain pollution to the environment.

Method used

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  • Method for preparing environmental-friendly type gel profile control agent
  • Method for preparing environmental-friendly type gel profile control agent
  • Method for preparing environmental-friendly type gel profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of an environment-friendly gel profile control agent, the preparation steps are as follows:

[0024] After completely dissolving 5g of acrylamide, 0.0015g of N,N'-methylenebisacrylamide and 0.5g of 2-acrylamido-2-methylpropanesulfonic acid in 70mL of distilled water, add 0.025g (NH 4 ) 2 S 2 o 8 , and carry out polymerization reaction at 60° C. in a nitrogen-enclosed atmosphere to form a prepolymer. Then 2g of polyvinyl alcohol PVA-1788 was completely dissolved with 30mL of distilled water, and the polyvinyl alcohol solution, 0.0015g of N,N'-methylenebisacrylamide and 0.025g of (NH 4 ) 2 S 2 o 8 Add it to the prepolymer, and continue the reaction at 80°C in a nitrogen-enclosed atmosphere until the reaction is complete to obtain a gel profile control agent. After purification and drying of the gel profile control agent and the raw materials 2-acrylamide-2-methylpropanesulfonic acid and polyvinyl alcohol, the infrared test was carried out to ob...

Embodiment 2

[0027] After completely dissolving 5g of acrylamide, 0.0015g of N-methylolacrylamide and 0.5g of styrenesulfonic acid in 70mL of distilled water, add 0.025g of K 2 S 2 o 8 , and carry out polymerization reaction at 60° C. in a nitrogen-enclosed atmosphere to form a prepolymer. Then 2g of polyvinyl alcohol PVA-1795 was completely dissolved with 30mL of distilled water, and the polyvinyl alcohol solution, 0.0015g of N-methylolacrylamide and 0.025g of K 2 S 2 o 8 Add it to the prepolymer, and continue the reaction at 80°C in a nitrogen-enclosed atmosphere until the reaction is complete to obtain a gel profile control agent.

[0028] During the test, the viscosity of the gel was measured with an NDJ-8S viscometer, and the temperature and salt resistance properties are shown in the attached image 3 And attached Figure 5 As shown, the temperature resistance range is 90-130°C; the applicable crude salt concentration range is 0-25% (by weight of the prepared profile control ag...

Embodiment 3

[0032] After completely dissolving 5g of acrylamide, 0.0025g of N-methylolacrylamide and 0.5g of styrenesulfonic acid in 70mL of distilled water, add 0.025g of K 2 S 2 o 8 , and carry out polymerization reaction at 60° C. in a nitrogen-enclosed atmosphere to form a prepolymer. Then 2g of polyvinyl alcohol PVA-1795 was completely dissolved with 30mL of distilled water, and the polyvinyl alcohol solution, 0.0025g of N-methylolacrylamide and 0.025g of K 2 S 2 o 8 Add it to the prepolymer, and continue the reaction at 80°C in a nitrogen-enclosed atmosphere until the reaction is complete to obtain a gel profile control agent.

[0033] During the test, the viscosity of the gel was measured with an NDJ-8S viscometer, and the temperature and salt resistance properties are shown in the attached image 3 And attached Figure 5 As shown, the temperature resistance range is 90-130°C; the applicable crude salt concentration range is 0-25% (by weight of the prepared profile control ag...

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Abstract

The invention relates to a method for preparing an environmental-friendly type gel profile control agent. The method comprises the following steps: completely dissolving a monomer A, a cross-linking agent and a monomer B by using distilled water, adding an initiator, and performing polymerization reaction at 20-80 DEG C in the atmosphere of sealing nitrogen so as to form prepolymer; subsequently completely dissolving polyving alcohol by using distilled water, adding an obtained polyving alcohol solution, the cross-linking agent and the initiator into the prepolymer, and continuously reacting at 50-80 DEG C in the atmosphere of sealing nitrogen till the reaction is completed, thereby obtaining the environmental-friendly type gel profile control agent. The environmental-friendly type gel profile control agent has the advantages that firstly, the raw materials are low in cost and easy to obtain, the production cost can be greatly lowered, and the environment is not polluted; secondly, the viscosity of the system and the property of the formed gel can be controlled; thirdly, the agent can be easily filled into a well, a high permeation layer in stratum can be effectively blocked, and thus a purpose of water shut-off and profile control is achieved; and fourthly, the agent is relatively good in stability.

Description

technical field [0001] The invention relates to a preparation method of an environment-friendly gel profile control agent, which belongs to the field of oil field chemistry. technical background [0002] In the process of oil drilling and production, water production from oil wells is a common phenomenon in the middle and late stages of oil production. There are many hazards in the oilfield effluent, such as the consumption of formation energy, the reduction of the pump efficiency of the pumping well, the aggravation of the corrosion and scaling of the pipeline equipment, and the increase of the load of the dehydration station. If it is not reinjected, it will have an impact on the environment, the separation and Treatment also increases the cost of oil recovery. With the continuous deepening of oilfield exploitation, conventional water plugging profile control agents can no longer meet the normal production needs of oilfields. Conventional gel profile control agents can ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C08F220/56C08F222/38C08F220/58C08F291/12C08F212/14C08F290/06C08G81/02
CPCC09K8/512C08F220/56C08F261/04C08F265/10C08F290/062C08F222/385C08F220/58C08F220/585C08F212/14
Inventor 杨隽徐黎刚闫霜王芬姚棋谢浩杨晓梅
Owner WUHAN INSTITUTE OF TECHNOLOGY
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