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Compound cellulose indepth water shutoff modifying and flooding agent for oil production and preparation method thereof

A technology of compound cellulose and water-adjusting and flooding agent, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problems of limiting the application of high temperature oil reservoirs, poor thermal stability and salt resistance, poor thermal stability, etc.

Inactive Publication Date: 2015-03-25
TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing polymer gel plugging agent system has a short gelation time at high temperature and poor thermal stability, which limits its application in high-temperature reservoirs. In addition, its thermal stability and salt resistance are poor, which cannot meet the needs of oil fields. Therefore, the current oilfield development work needs a new type of polymer control and displacement agent with better plugging control performance and environmental protection performance.

Method used

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  • Compound cellulose indepth water shutoff modifying and flooding agent for oil production and preparation method thereof
  • Compound cellulose indepth water shutoff modifying and flooding agent for oil production and preparation method thereof
  • Compound cellulose indepth water shutoff modifying and flooding agent for oil production and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0014] Embodiment 1: The composition of the composite cellulose deep water plugging and flooding regulating agent for oil recovery is calculated by mass percentage, and the formula is:

[0015]

[0016] Dissolve the cellulose with 1-butyl-3-methylimidazolium chloride salt, weigh the cellulose and add it to 1-butyl-3-methylimidazolium chloride salt, and react under stirring conditions at 100°C for 2 hours, Finally a 10 wt% clear solution was obtained. Then add a phenolic cross-linking agent and a surfactant, and add additives to adjust the pH to 6-7 under the condition of continuous stirring, and react for 3 hours to obtain the product.

[0017] The rotational speed of the stirring condition is 800r / min.

Embodiment 2

[0018] Embodiment 2: The composition of the composite cellulose deep water plugging and flooding agent for oil recovery is calculated by mass percentage, and the formula is:

[0019]

[0020]

[0021] Dissolve the cellulose with 1-butyl-3-methylimidazolium chloride salt, weigh the cellulose and add it to 1-butyl-3-methylimidazolium chloride salt, and react under stirring conditions at 100°C for 2 hours, Finally a 10 wt% clear solution was obtained. Then add a phenolic cross-linking agent and a surfactant, and add additives to adjust the pH to 7-9 under the condition of continuous stirring, and react for 2 hours to obtain the product.

[0022] The rotational speed of the stirring condition is 700r / min.

[0023] Compared with the first embodiment, the second embodiment has better high temperature resistance.

Embodiment 3

[0024] Embodiment three: The composition of the composite cellulose deep water plugging and flooding regulating agent for oil recovery is calculated by mass percentage, and the formula is:

[0025]

[0026] Dissolve the cellulose with 1-butyl-3-methylimidazolium chloride salt, weigh the cellulose and add it to 1-butyl-3-methylimidazolium chloride salt, and react under stirring conditions at 100°C for 2 hours, Finally a 10% by weight clear solution was obtained. Then add phenolic cross-linking agent and surfactant, under the condition of continuous stirring, add auxiliary agent to adjust pH to 11-12, react for 4 hours to obtain the product.

[0027] The rotational speed of the stirring condition is 1000r / min.

[0028] Compared with the second embodiment, the third embodiment has a longer crosslinking time.

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Abstract

The invention provides a compound cellulose indepth water shutoff modifying and flooding agent for oil production and a preparation method of the compound cellulose indepth water shutoff modifying and flooding agent. The preparation method is characterized in that compound cellulose serves as the raw material for preparing a compound gel type indepth water shutoff profile control agent; the field application result shows that a product synthesized by the agent has the characteristics of causing little damage, being temperature resistant and delaying crosslinking time; the product can be automatically repaired after being broken during percolation, so that injected water can be greatly prevented from flowing all around between pre-crosslinked particles, and as a result, the temperature resisting and salt resisting effects are realized; compound cellulose indepth water shutoff modifying and flooding agent for oil production is prepared from the components of cellulose, 1-butyl-3-methylimidazolium, a phenolic aldehyde crosslinking agent, additives and a surface active agent.

Description

Technical field: [0001] The invention relates to the field of chemicals for the petroleum industry, in particular to a composite cellulose-based deep water plugging and flooding agent for oil recovery and a preparation method thereof. Background technique: [0002] At present, the influence of reservoir heterogeneity on the sweep coefficient of water flooding and chemical displacement fluid in oil production has attracted increasing attention in the industry. It is recognized that only through deep regulation and flooding can the reservoir be adjusted and improved more economically and effectively In this way, the volumetric sweep coefficient of injection fluid can be improved, the realization of high displacement efficiency of chemical flooding can be ensured, and the oil recovery factor in the stage of water injection oil recovery can be improved. [0003] The existing polymer gel plugging agent system has a short gelation time at high temperature and poor thermal stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C08B15/10
CPCC09K8/512C08B15/10
Inventor 胡玉国梁海臣李靖张冠洲张有强张凤跃肖劲松孙红桃李东
Owner TIANJIN DAGANG OILFIELD BINGANG GRP BOHONG PETROLEUM CHEM
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