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High-temperature-resistant gas-humidity reversal agent for improving recovery ratio of condensate gas reservoir as well as preparation method and application thereof

A gas-moisture reversal agent and technology for condensate gas reservoirs, which are applied in chemical instruments and methods, drilling compositions, etc., and can solve problems such as unsatisfactory gas-moisture reversal effect, failure to achieve strong air-humidity, poor temperature resistance, etc. problems, to achieve the effect of facilitating on-site promotion and application, easy preparation, and improved flow conditions

Active Publication Date: 2020-04-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this improvement is very limited, mainly because it only changes the wettability of the area near the wellbore from liquid wet to gas wet or neutral gas wet, and does not achieve the effect of strong gas wetness, and the temperature resistance is poor
In addition, there are currently few new products or materials for air-moisture reversal, and most of them are selected or compounded from existing chemical agents, resulting in unsatisfactory air-moisture reversal effects

Method used

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  • High-temperature-resistant gas-humidity reversal agent for improving recovery ratio of condensate gas reservoir as well as preparation method and application thereof
  • High-temperature-resistant gas-humidity reversal agent for improving recovery ratio of condensate gas reservoir as well as preparation method and application thereof
  • High-temperature-resistant gas-humidity reversal agent for improving recovery ratio of condensate gas reservoir as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A method for preparing a high-temperature-resistant gas-humidity reversal agent that can be used to improve the recovery rate of condensate gas reservoirs, the steps are as follows:

[0060] (1) add 100g deionized water, compound emulsifier (sodium lauryl sulfate and polyoxyethylene octylphenol ether material ratio in the reactor that stirrer, temperature measuring equipment and reflux device are equipped with are 1: 1) 2g and 20g of methyl acrylate, and stirred for 25 minutes. Under the protection of nitrogen, the temperature was 30°C, high-speed stirring and emulsification for 40 minutes, and 0.53 g of sodium persulfate aqueous solution was added.

[0061] (2) Start oil bath heating, and keep it for 35 minutes when the temperature in the reactor rises and reaches 75°C. Add 1.12 g of sodium persulfate aqueous solution again, and after constant temperature reaction for 15 minutes, add perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, methyl acrylate and p...

Embodiment 2

[0069] The preparation of the vapor-humidity reversal agent was as described in Example 1, except that the acrylate in steps (1) and (2) was changed to ethyl acrylate.

[0070] Mix the gas-moisture reversal agent prepared in this example with deionized water to make a 1.2% solution, use it to age the condensate gas reservoir rock for 28 hours, dry it at 100°C, take it out and let it stand at room temperature for 4 hours, and measure the After treatment, the contact angles of deionized water and n-hexadecane on the rock surface of condensate gas reservoirs are 124° and 108° respectively (such as image 3 shown).

Embodiment 3

[0072] The preparation of the vapor-humidity reversal agent was as described in Example 1, except that the acrylate in steps (1) and (2) was 2-methyl methacrylate.

[0073] Mix the gas-moisture reversal agent prepared in this example with deionized water to make a 1.2% solution, use it to age the condensate gas reservoir rock for 28 hours, dry it at 100°C, take it out and let it stand at room temperature for 4 hours, and measure the After treatment, the contact angles of deionized water and n-hexadecane on the rock surface of condensate gas reservoirs are 127° and 95° respectively (such as Figure 4 shown).

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Abstract

The invention relates to a high-temperature-resistant gas-humidity reversal agent capable of being used for improving the recovery ratio of a condensate gas reservoir as well as a preparation method and application thereof. The preparation method comprises the following steps: in the presence of a persulfate initiator, heating a composite emulsifier and acrylate in an aqueous solution to a reaction temperature, dropwise adding perfluorooctylethyl acrylate, dodecafluoroheptyl methacrylate, acrylate and a perfluorohexylethyl methacrylate monomer, carrying out a polymerization reaction, cooling,adjusting the pH value of the emulsion to be neutral, and filtering to obtain a product; the obtained product can be directly prepared into a 0.5-2% solution, and the 0.5-2% solution and a wellbore working solution enter a condensate gas reservoir together to change the surface wettability of the reservoir near the wellbore of the condensate gas reservoir so as to improve the recovery rate of thecondensate gas reservoir.

Description

technical field [0001] The invention relates to a high-temperature-resistant gas-humidity reversal agent that can be used to improve the recovery rate of condensate gas reservoirs, a preparation method and application thereof, and belongs to the petrochemical technology field of improving gas reservoir exploitation and production increase. [0002] technical background [0003] my country has a shortage of oil and gas resources and has been heavily dependent on imports for a long time. With the continuous changes in the energy structure, the research and development of unconventional oil and gas resources has strategic significance in recent years. As an important part of unconventional oil and gas resources, gas condensate reservoirs are the key to ensuring energy security and alleviating supply pressure. When the condensate gas reservoir is produced, when the pressure near the wellbore is lower than the dew point pressure, the liquid phase will condense near the wellbore, r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/24C08F220/18C08F220/14C08F2/26C08F2/30C09K8/588
CPCC08F220/24C08F2/26C08F2/30C09K8/588C08F220/18C08F220/14
Inventor 王彦玲李永飞梁雷汤龙浩李强孟令韬兰金城
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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