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Thermally-induced gel water shutoff and profile control agent and preparation method and application thereof

A technology of water profile control agent and thermal gel, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high cost of profile control, limited radius of profile control, small thermal thickening range, etc., and achieve The effect of wide application temperature range, great promotional value and low cost of raw materials

Inactive Publication Date: 2013-08-21
UNIV OF SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

[0003] Chinese patent CN102559159 discloses a weak gel profile control and water shutoff agent, which cross-links partially hydrolyzed polyacrylamide and phenolic resin to obtain a weak gel profile control water shutoff agent that absorbs water and swells, with high gel strength and good oil shutoff performance. The rate is small, but the selectivity of this type of resin profile control agent is poor, it is easy to cause damage to the oil layer, and then pollute the formation and affect the production capacity
Chinese patent CN102786919 discloses an emulsified asphalt profile control agent, which is based on asphalt and contains ten kinds of component profile control agent particles, which can control the profile of oil reservoirs with pore throat radius greater than 4um, and cause less damage to oil flow pipelines. However, due to the combination of a large number of complex inorganic components, the structure of the prepared profile control agent is unstable, and the preparation process is complicated. At the same time, due to the large particle size, the profile control radius is limited.
Chinese patent CN101033392 discloses an expansive flow gel profile control water shutoff agent, which mixes polymer polyacrylamide and boron-modified phenolic resin delayed crosslinking agent to obtain an expandable flow gel profile control water shutoff agent It has high water-absorbing expansion and temperature resistance, but this type of profile control agent has poor environmental adaptability, salt resistance needs to be improved, and it will also cause certain damage to oil layers
Chinese patent CN1837574 discloses a heat-sensitive water-soluble gel used for steam injection thermal channeling well sealing channeling profile modification, which is prepared by mixing cellulose ether, inorganic ammonia salt and alkali metal salt, and the gel has little damage to the formation , high plugging strength, but cellulose ether is easy to biodegrade, and it is difficult to dissolve on-site dispensing, the cost of profile control is high, and the thermal thickening range is small
Chinese patent CN102464783 discloses a water-soluble thermal thickening copolymer that can be used for water plugging and profile control. Its main structural unit is composed of hydrophilic groups, and the side chain is a small amount of polyethylene glycol with a low critical solution temperature. Similar water plugging profile control agents can be used at high temperatures, but they also face the problems of high cost of profile control, difficulty in dissolution and small thermal thickening range

Method used

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  • Thermally-induced gel water shutoff and profile control agent and preparation method and application thereof
  • Thermally-induced gel water shutoff and profile control agent and preparation method and application thereof
  • Thermally-induced gel water shutoff and profile control agent and preparation method and application thereof

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preparation example Construction

[0035] Correspondingly, the present invention also provides a preparation method of the above-mentioned thermal gel water plugging profile control agent, comprising the following steps:

[0036] The first step: the cationic surfactant and 2-hydroxyl-5-methylbenzoic acid are stirred and dissolved, and the present invention has no special limitation on the dissolving method of the cationic surfactant and 2-hydroxyl-5-methylbenzoic acid , methods well known to those skilled in the art can be adopted, and in order to make the dissolution more rapid, the solution can also be heated to 30-40° C. during the dissolution.

[0037] The second step: adding hydrophobically modified water-soluble polyacrylamide to the solution obtained in the first step, stirring and dissolving to obtain the thermogenic gel water plugging profile control agent of the present invention. Those skilled in the art can use various methods to obtain hydrophobically modified water-soluble polyacrylamide, preferab...

Embodiment 1

[0045] (1) Add 1.2g of cetyltrimethylammonium bromide, 0.75g of 2-hydroxy-5-methylbenzoic acid and 180ml of water, stirred at 35°C for 30 minutes until cetyltrimethylammonium bromide and 2-hydroxy-5-methylbenzoic acid were completely dissolved;

[0046] (2) Add 16.98g of acrylamide, 2.62g of 2-acrylamide-2-methylpropanesulfonic acid, 0.4g of octadecyldimethylallylamine bromide to the solution obtained in step (1), Continue to stir at 35°C for 6 hours until the solution is completely clear, then blow nitrogen gas for 60 minutes to remove dissolved oxygen, then add 10ml of 1.2% by mass potassium persulfate solution and 10ml of 0.5% by mass urea solution as free radical initiation agent, stirred for 5 hours under nitrogen atmosphere and 35°C for polymerization reaction, discharged, dried at 80°C, crushed, and sieved to obtain a white powdery product;

[0047] (3) Add 0.8 g of the powdered product obtained in step (2) into 99.2 ml of deionized water under stirring, continue stirr...

Embodiment 2

[0052] Repeat Example 1, with the following differences: In the step (3) of Example 1, "0.8g of powdery product is added to 99.2ml of deionized water under stirring conditions" is changed to "0.5g of powdery product is stirred Add 99.5ml of deionized water under the condition of ", that is to get thermogenic gel water plugging profile control agent T2, its gel transition temperature range is 60 ℃ ~ 70 ℃, storage modulus at temperature from 20 ℃ to 90 ℃ The range can be increased from 0.19Pa to 21.89Pa, which shows that the higher the temperature, the more significant the T2 viscoelasticity, which can form a gel barrier at high temperature for water shutoff and profile control.

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Abstract

The invention discloses a thermally-induced gel water shutoff and profile control agent and a preparation method and application thereof. The thermally-induced gel water shutoff and profile control agent comprises hydrophobic modification water-soluble polyacrylamide, a cationic surfactant and 2-hydroxy-5-methyl benzoic acid. The thermally-induced gel water shutoff and profile control agent disclosed by the invention can be used as an oil-water same-layer well selective water shutoff agent or water flooding well and chemical flooding well profile control agent; and the environmental response type profile control agent generates a gel barrier at the stratum temperature after being injected into a stratum high-permeation layer zone, and a water channel can be effectively blocked so as to effectively control the spread range of the non-homogeneous stratum fluid to achieve an aim of deep profile control and water shutoff.

Description

technical field [0001] The invention relates to the field of water plugging and profile control agents, in particular to a gel water plugging and profile control agent. Background technique [0002] Due to the long-term water flooding and the original heterogeneity of the reservoir, the current oilfield generally has a high water cut, and there are a large number of high-permeability channels or large pores in the oilfield, so that the injected water easily bypasses the medium-low permeability layer and directly enters the high-permeability layer , which not only prevents crude oil from being produced in the middle and low permeability layers, but also produces too much water prematurely, which also increases the cost of oil production and greatly reduces the benefits of water injection in the oilfield. The technology of water plugging and profile control is an effective method to improve the water injection effect and the ultimate oil recovery when the oil field enters the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C09K8/588C08F220/56
Inventor 郝翔杨海洋谢永军李化真
Owner UNIV OF SCI & TECH OF CHINA
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