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A retardant and a retardant acid working solution

A technology of retarder and working fluid, applied in the direction of drilling compositions, chemical instruments and methods, etc., which can solve the problems of shortening the effectiveness of production increase, fast reaction rate, short penetration distance, etc.

Active Publication Date: 2016-08-10
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In conventional acidizing construction, the reaction rate of hydrochloric acid or soil acid to acid rock treatment is usually fast and the penetration distance is short, so it can only eliminate the damage near the wellbore, greatly reducing the effectiveness of stimulation

Method used

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  • A retardant and a retardant acid working solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] First, add 8g of acrylamide to 18.7g of formaldehyde solution with a mass fraction of 33%. After it is completely dissolved, put it into a three-necked flask; then add 14g of phosphoric acid with a mass fraction of 85%. After it is completely dissolved, add 0.1g of hydroquinone , under the condition of 90° C., reacted for 14 h while stirring to obtain the product monomer.

[0055] Take 0.84g of acrylic acid in a three-necked flask, add 10.2g of distilled water to dissolve it completely, add 30g of monomer FAP, stir evenly, put it in an oil bath, heat up to 80°C while stirring; then add 0.84g of peroxide Hydrogen, react at 80°C for 1h to obtain retarder.

[0056] Take 7.1g of retarder, add it to 30g of HCl with a mass fraction of 17%, add 4g of ammonium chloride, 1g of ammonium fluoride, and 15g of formaldehyde. Agent, 0.86g acidification corrosion inhibitor, after completely dissolving in sequence, you can get slow acid working solution.

[0057] The present invention...

Embodiment 2

[0062] First, add 8g of acrylamide to 18.7g of formaldehyde solution with a mass fraction of 33%. After it is completely dissolved, put it into a three-necked flask; then add 14g of phosphoric acid with a mass fraction of 85%. After it is completely dissolved, add 0.1g of hydroquinone , under the condition of 90° C., reacted for 14 h while stirring to obtain the product monomer.

[0063] Take 1.0g of acrylic acid in a three-necked flask, add 10.2g of distilled water to dissolve it completely, add 30g of monomer FAP, stir evenly, put it in an oil bath, heat up to 90°C while stirring; then add 1.2g of peroxide Hydrogen reacted at 90°C for 2h to obtain a retarder.

[0064] Take 8.4g of retarder, add it to 30g of HCl with a mass fraction of 17%, add 4g of ammonium chloride, 1g of ammonium fluoride, and 15g of formaldehyde. Agent, 0.86g acidification corrosion inhibitor, after completely dissolving in sequence, you can get slow acid working solution.

[0065] In the present inven...

Embodiment 3

[0069] First, add 8g of acrylamide to 18.7g of formaldehyde solution with a mass fraction of 33%. After it is completely dissolved, put it into a three-necked flask; then add 14g of phosphoric acid with a mass fraction of 85%. After it is completely dissolved, add 0.1g of hydroquinone , under the condition of 90° C., reacted for 14 h while stirring to obtain the product monomer.

[0070] Take 1.2g of acrylic acid in a three-necked flask, add 13g of distilled water to dissolve it completely, add 35g of monomer FAP, stir evenly, put it in an oil bath, heat up to 80°C while stirring; then add 1.2g of hydrogen peroxide , Reacted at 80°C for 2h to obtain retarder.

[0071] Take 7.5g of retarder, add it to 30g of HCl with a mass fraction of 17%, add 4g of ammonium chloride, 1g of ammonium fluoride, and 15g of formaldehyde. Agent, 0.86g acidification corrosion inhibitor, after completely dissolving in sequence, you can get slow acid working solution.

[0072] In the present inventi...

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Abstract

A retardant is provided. The retardant is prepared through steps of A) subjecting formaldehyde, an amine and phosphoric acid to a Mannich reaction to obtain a monomer, and B) copolymerizing the monomer and acrylic acid to obtain the retardant. The retardant is prepared through copolymerizing the monomers. One molecular chain of the retardant after the polymerization contains a plurality of releasable Hs and the Hs can be slowly released in stratums, thus achieving an effect of acidifying the stratums and improving stratum corrosion capability of the admixture. The invention also provides a retardant acid working solution comprising the retardant. Test results prove that the retardant acid working solution has good slow release effects, and is turned into a spent acid after 30-90 min.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a retarder and a retarder working fluid. Background technique [0002] Among the oil reserves that have been produced in my country, low-permeability reservoirs account for 11%. With the continuous exploration and development of oil, low-permeability reservoirs account for more than 50% of the undeveloped reserves. The recovery factor has become particularly urgent. [0003] At present, acid fracturing is mostly used for stimulation treatment of carbonatite or limestone formations, that is, acidizing the formations with acid liquid first, and then fracturing after acidification. channel to open the oil flow channel to achieve the purpose of increasing production. [0004] The current acidizing mostly adopts conventional matrix acid acidizing, that is, treating the formation with hydrochloric acid or earth acid (a mixture of hydrochloric acid and hydrof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F230/02C08F220/06C09K8/74
CPCC08F230/02C09K8/74C08F220/06
Inventor 全红平向文军崔艳艳田海洋徐为明
Owner SOUTHWEST PETROLEUM UNIV
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