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A kind of carbon dioxide gel foam containing thiourea structure and its preparation method and application

A carbon dioxide, thiourea technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of no acid resistance, easy to break glue, unable to achieve selective water blocking, etc., and achieve easy pumping. To the formation, enhanced oil recovery, strong water plugging selectivity

Active Publication Date: 2021-09-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] From the current point of view, gel foam is basically only suitable for neutral or weakly alkaline oil reservoirs. The reason is that the common anionic polyacrylamide phenolic gel system does not have acid resistance, and it is easy to Gel breaking occurs, failing to achieve the purpose of selective water blocking

Method used

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  • A kind of carbon dioxide gel foam containing thiourea structure and its preparation method and application
  • A kind of carbon dioxide gel foam containing thiourea structure and its preparation method and application
  • A kind of carbon dioxide gel foam containing thiourea structure and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0064] A method for synthesizing a carbon dioxide gel foam containing a thiourea structure for oilfield water plugging, comprising the following steps:

[0065] 1) Preparation of phenolic organic compounds containing thiourea structure

[0066] Fully mix 7.6g of N-phenylthiourea and 16g of liquid bromine in a constant temperature round bottom flask at 50°C, then add 2ml of ferric bromide, react for 5 minutes, pour the liquid in the flask into a beaker filled with cold water In, wash with water or 10% sodium hydroxide solution.

[0067] The product obtained in the previous step was mixed with 25 mL of 10% sodium carbonate solution in a 130° C. round-bottomed flask, and reacted for 1 hour to obtain an organic compound containing sodium phenate and thiourea structure. After cooling to room temperature, add 100ml of 0.5mol / L nitric acid into the round bottom flask, shake gently and react for 1h to obtain a phenolic organic compound containing a thiourea structure. Add 5 mL of 10...

Embodiment 2

[0072] As shown in Example 1, the difference is that each component mass percent in step 2) becomes the following ratio:

[0073] 0.4% methylene polyacrylamide (hydrolysis degree 13%, molecular weight 14 million), 0.6% phenol, 0.6% paraformaldehyde, 0.5% octylphenol polyoxyethylene ether, 0.4% 4-phenol sulfur Urea, 0.4% sodium sulfite. The balance is water.

Embodiment 3

[0075] As shown in Example 1, the difference is that the phenols in step 2) are changed to pyrocatechol.

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Abstract

The invention relates to a carbon dioxide gel foam containing a thiourea structure, a preparation method and application thereof. The carbon dioxide gel foam containing thiourea structure is prepared by passing carbon dioxide gas into the gel solution. The mass percent composition of the gel solution is: 0.2% to 0.8% of methylene polyacrylamide, 0.2% to 1.4% of phenolic crosslinking agent, 0.3% to 1.0% of foaming agent, phenolic organic compound containing thiourea structure 0.2% to 0.5%, auxiliary agent 0.2% to 0.5%, and the balance is water. The carbon dioxide gel foam of the present invention has strong water blocking selectivity, does not block oil flow passages, does not affect oil flow, and improves crude oil recovery.

Description

technical field [0001] The invention relates to a carbon dioxide gel foam containing a thiourea structure and a preparation method and application thereof, belonging to the technical field of oil field chemistry. Background technique [0002] my country's sour oil and gas fields are widely distributed and rich in resources, but at the same time there are also great difficulties in development. The reason is that its acidic formation limits the application of many stimulation measures. [0003] In terms of selective water shutoff measures, foam gel plugging agents are widely used in oil fields because of their low price and good selective water shutoff effect. For example, CN 108203579A discloses a nitrogen foam gel plugging agent, the foam gel skeleton is obtained by passing the nitrogen into the gel, and the gel is generated by the following components in mass percentage Prepared by crosslinking reaction: 1.5%-2.5% of polyacrylamide, 0.3%-1% of foaming agent, 1%-3% of foa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/518C09K8/68C09K8/70C09K8/88
CPCC09K8/512C09K8/518C09K8/685C09K8/703C09K8/887
Inventor 王彦玲兰金城孟令韬蒋保洋许宁梁雷刘斌汤龙皓
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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