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Gel temporary plugging agent

A technology of temporary plugging agent and jelly, which is applied in the field of partially hydrolyzed polyacrylamide phenolic jelly temporary plugging agent, can solve the problems of high polymer cost, poor operability, toxicity of crosslinking agent, etc., and achieves low cost and easy acquisition. , The effect of improving the strength of jelly

Inactive Publication Date: 2017-04-26
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of polymers currently used is high, and the crosslinking agent also has disadvantages such as toxicity and irritation
Add the breaker ammonium persulfate and other oxides, the preparation is complicated and the operability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 0.05g resorcinol, 0.05g urotropine, 0.4g acetic acid to a beaker, add tap water to 50g, stir evenly to make it fully dissolved, add 0.3g partially hydrolyzed polyacrylamide and 0.05g Water-soluble polyvinyl alcohol, then add tap water until 50g is fully dissolved, then mix the solutions in the above two beakers, stir evenly, and obtain the jelly temporary blocking agent gel of the present invention. Take 20ml and put it into an ampoule bottle, sinter and seal it, and place it in a constant temperature water bath at 45°C to observe that the gelation time is 36 hours, the gelation time is 216h, and the viscosity after gelation is 7.8mPa·s.

[0030] Inspection of blocking ability:

[0031] Investigate the plugging ability of the jelly provided by the present invention. The specific experimental process is as follows: two sand-filling tubes with an inner diameter of 2.5 cm and a length of 20 cm are filled with quartz sand to obtain high and low permeability simulated c...

Embodiment 2

[0035] Add 0.06g resorcinol, 0.06g urotropine, 0.4g acetic acid in a beaker, add 5% NaCl aqueous solution to 50g and stir evenly to make it fully dissolved, add 0.3g partially hydrolyzed polyacrylamide and 0.1g water-soluble polyvinyl alcohol, add 5%NaCl aqueous solution again to 50g and fully dissolve, then mix the solutions in the above-mentioned two beakers, stir evenly, promptly obtain the jelly temporary plugging agent of the present invention into gelling solution. Take 20ml and put it into an ampoule bottle, sinter and seal it, and place it in a constant temperature water bath at 45°C to observe that the gelation time is 30 hours, the gelation time is 200h, and the viscosity after gelation is 7.3mPa·s.

[0036] Investigate the plugging ability of the jelly provided by the present invention. The specific experimental process is as follows: two sand-filling tubes with an inner diameter of 2.5 cm and a length of 20 cm are filled with quartz sand to obtain high and low perm...

Embodiment 3

[0040] Add 0.06g resorcinol, 0.06g urotropine, 0.3g acetic acid, 0.2g sodium fluoroborate to a beaker, add tap water to 50g, stir well to make it fully dissolved, add 0.35g to another beaker to partially hydrolyze Polyacrylamide and 0.1g water-soluble polyvinyl alcohol are added with tap water until 50g is fully dissolved, then the solutions in the above two beakers are mixed and stirred evenly to obtain the jelly temporary plugging agent gelling solution of the present invention. Take 20ml and put it into an ampoule bottle, sinter and seal it, and place it in a constant temperature water bath at 65°C to observe that the gelation time is 24 hours, the gelation time is 192h, and the viscosity after the gelation is 6.5mPa·s.

[0041] Inspection of blocking ability:

[0042] Investigate the plugging ability of the jelly provided by the present invention. The specific experimental process is as follows: two sand-filling tubes with an inner diameter of 2.5 cm and a length of 20 cm...

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Abstract

The invention discloses a gel temporary plugging agent. The gel temporary plugging agent is prepared from, by mass, 0.3-0.4% of partially hydrolyzed polyacrylamide, 0.03-0.08% of phenol crosslinking agent, 0.03-0.08% of aldehyde crosslinking agent, 0.05-0.2% of water soluble polyvinyl alcohol, 0.05-0.5% of hydrochloric acid or acetic acid, 0.2-0.5% of antioxidant and the balance water, and the sum of the mass percents of all the components is 100%, wherein the phenol crosslinking agent is one of combination of resorcinol and hydroquinone, the aldehyde crosslinking agent is urotropin, and the antioxidant is one or combination of diphenylamine, p-phenylenediamine and sodium fluoborate. The gelling time of the gel temporary plugging agent is adjustable in the range of 5-50 h, the gel breaking time is adjustable in the range of 120-240 h, after gel breaking, the viscosity is measured by a rotational viscometer at the shear rate of 70 / s to be 5-10 mPa.s, which indicates thorough gel breakage, and therefore the gel temporary plugging agent can be suitable for most conventional oil deposit.

Description

[0001] Technical field: [0002] The invention relates to the technical field of oilfield chemistry, in particular to a partially hydrolyzed polyacrylamide phenolic gel temporary plugging agent. [0003] Background technique: [0004] With the continuous long-term development of water injection oilfields, after entering the middle and late stages of development, the comprehensive water cut has risen, and the oilfield production benefits have declined year by year. In order to improve the recovery rate, most of the oil wells have undergone fracturing. With the continuous deepening of oilfield exploitation, it is more and more difficult to achieve high and stable production. Moreover, with the increase of oil well development years and the number of measures, the old wells have artificial The production potential of fractures is getting smaller and smaller, and repeated fracturing technologies such as increasing the scale alone can no longer meet the development needs of oilfield...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512
CPCC09K8/5083C09K8/512
Inventor 葛际江韩胜霞张贵才蒋平孙铭勤林杨
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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