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High-temperature-resistant weak-gel type profile control agent and preparation method thereof

A technology of weak gel and profile control agent, which is applied in the field of high temperature-resistant weak gel profile control agent and its preparation, can solve the problems of profile control that cannot meet high temperature formation water injection, poor high temperature resistance, short validity period, etc., and achieve Facilitate large-scale promotion and application, inhibit decomposition, and have a long validity period

Inactive Publication Date: 2017-07-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The weak gel profile control agent provided by the prior art can only meet the profile control requirements when the formation temperature is 60-90°C. When the formation temperature is higher than 90°C, the weak gel profile control agent has poor high temperature resistance And the validity period is short, which cannot meet the profile control of high-temperature formation water injection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] In this example, the modified phenolic resin and additives used in the profile control agent were firstly prepared, as follows:

[0053] 1), preparation of modified phenolic resin

[0054] Add 18.0 g of phenol into the reactor, heat to 50° C., and then add 3.6 g of NaOH with a mass concentration of 10% as a catalyst while stirring. After 10 minutes of heat preservation, 18 g of formaldehyde solution with a mass concentration of 30% was added dropwise within 35 minutes, the temperature was rapidly raised to 70°C, and the temperature was kept for 3 hours. Finally, 4 g of urea was added, mixed evenly, kept warm for 10 min, and cooled to room temperature to obtain a modified phenolic resin.

[0055] 2), Preparation Auxiliary

[0056] Mix 1.34g of aluminum chloride and 18g of oxalic acid and dissolve in water, then add 42.76g of ammonium chloride, stir evenly, adjust the pH of the reaction system to about 7 with ammonia water, remove the water after the reaction, and obtai...

Embodiment 2

[0059] In this example, the modified phenolic resin, additives, and partially hydrolyzed polyacrylamide aqueous solution provided in Example 1 were mixed evenly, and placed in a constant temperature and humidity chamber, and kept at 90°C and a relative humidity of 1%. treatment to obtain a high temperature resistant weak gel profile control agent. Wherein, the content of each component in the high temperature resistant weak gel type profile control agent is as follows:

[0060] The concentration of partially hydrolyzed polyacrylamide is 0.8g / L, the concentration of modified phenolic resin is 0.6g / L, and the concentration of additives is 0.5g / L.

[0061] The initial viscosity of the prepared high-temperature-resistant weak gel type profile control agent was measured, which was 1223mPa·s, and then it was placed in a jar with a stopper, and the gelation situation was observed. After being placed in the jar for 30 days, Then the viscosity of the profile control agent was measured...

Embodiment 3

[0063] In this example, the modified phenolic resin, additives, and partially hydrolyzed polyacrylamide aqueous solution provided in Example 1 were mixed evenly, and placed in a constant temperature and humidity chamber, and subjected to constant temperature treatment at 110°C and a relative humidity of 2%. , to obtain high temperature resistant weak gel profile control agent. Wherein, the content of each component in the high temperature resistant weak gel type profile control agent is as follows:

[0064] The concentration of partially hydrolyzed polyacrylamide is 2.5g / L, the concentration of modified phenolic resin is 2.0g / L, and the concentration of additives is 2.0g / L.

[0065] The initial viscosity of the prepared high-temperature-resistant weak gel type profile control agent was measured, and it was 1857mPa·s, and then it was placed in a jar with a stopper, and the gelation situation was observed. After being placed in the jar for 30 days, Then the viscosity of the pro...

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Abstract

The invention discloses a high-temperature-resistant weak-gel type profile control agent and a preparation method thereof, and belongs to the field of chemical water plugging and profile control agents. The high-temperature-resistant weak-gel type profile control agent comprises the following components: partially-hydrolyzed polyacrylamide with a concentration of 0.8g / L-2.5g / L, modified phenol-formaldehyde resin with a concentration of 0.6 g / L-2.0 g / L, an auxiliary agent with a concentration of 0.5 g / L-2.0 g / L and water. Phenol is added into a reaction kettle and heated to 45-55 DEG C, an alkaline catalyst is added with stirring , the temperature is kept for 10-30 minutes, a formaldehyde solution is dropwise added, the mixture is rapidly heated to 70-90 DEG C, the temperature is kept for 3-5 hours, and finally urea is added, uniform mixing is conducted, and the temperature is kept for 10-30 minutes to obtain the modified phenol-formaldehyde resin, wherein the molar ratio of phenol to formaldehyde in the formaldehyde solution is1:(2.7-3.3), and the usage amount of the urea is 1-5% of the total mass of the phenol and the formaldehyde solution. Aluminum chloride is mixed with oxalic acid and then the mixture is dissolved in water, ammonium chloride is added, the obtained mixture is allowed to react under the condition that the pH value of the reaction system is 6-8 at a stirring state, and water is removed, so that the auxiliary agent is obtained, wherein the molar ratio of aluminum chloride to oxalic acid to ammonium chloride is 1: (15-30): (70-90). The high-temperature-resistant weak-gel type profile control agent can resist high temperature of 90-110 DEG C and is long in validity period.

Description

technical field [0001] The invention relates to the field of chemical water plugging profile control agents, in particular to a high temperature resistant weak gel profile control agent and a preparation method thereof. Background technique [0002] At present, most oil fields in my country use water injection to develop oil fields. In the later stage of development, due to the heterogeneity of the formation, 80% to 90% of the water injected into the oil layer is absorbed by the high-permeability formation with a small thickness, resulting in water injection. The profile is very uneven, reducing the recovery efficiency of the reservoir. In order to adjust the uniformity of the water injection profile, increase the sweep coefficient of the injected water, and play the role of the medium and low permeability formations, so as to improve the oil recovery rate, it is necessary to block the high permeability formations to a certain extent. The chemical agents used for the blockage...

Claims

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Application Information

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IPC IPC(8): C09K8/512
CPCC09K8/512
Inventor 王洪涛任红梅孟庆春陈亚娟刘玮冯丽娟张宏时昌新唐先荣祖莉华张玉珍柏洁赵良言马樱
Owner PETROCHINA CO LTD
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