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Reversible physical crosslinking agent and preparation method thereof

A technology of physical cross-linking agent and surfactant, applied in the direction of chemical instruments and methods, drilling compositions, etc. Few reports, complex synthesis process and other issues, to achieve the effect of low price, few types, and simple synthesis process operation

Inactive Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102040995A discloses a preparation method of a high-temperature delayed organic zirconium cross-linking agent. The applicable temperature of the invention is 80-120°C, and the cross-linking delay time is 50-300s. This invention is not suitable for reservoirs with a temperature higher than 120°C
Chinese patent CN102838781 A introduces an ultra-high temperature organic zirconium crosslinking agent suitable for polymer crosslinking, which consists of 200-350 parts of water, 170-280 parts of organic alcohol, 40-100 parts of zirconium compound, 20-50 parts of organic Acid, 300-350 parts of alkanolamine, the temperature resistance of this invention can reach 200°C, and the damage rate is 24.75%. Although the temperature resistance of this patent has been improved, the damage to the reservoir is relatively large
Chinese patent CN 102108294 discloses a preparation method of an organic titanium crosslinking agent for polyhydric alcohol fracturing fluid, which consists of alkali, sugar, glycol and tetrabutyl titanate mixed in a certain proportion, and the reaction temperature is 110-150 °C , the reaction time is 1 to 5 hours, the patent does not introduce the delayed cross-linking time and temperature resistance of the cross-linking agent
The main problems of chemical crosslinking agents are that there are many types of raw materials required for synthesis, high cost of raw materials, high toxicity, and complicated synthesis process; the friction resistance of the prepared fracturing fluid system is large, the gel breaking is not complete, and it is not easy to flow back
So far, there are few special reports on reversible physical crosslinking agents in domestic and foreign literature.

Method used

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  • Reversible physical crosslinking agent and preparation method thereof
  • Reversible physical crosslinking agent and preparation method thereof
  • Reversible physical crosslinking agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] Example 1: Preparation of reversible physical crosslinking agent.

[0041] Add a certain amount of deionized water into the beaker, heat to 40°C, weigh 20% sodium dodecylsulfonate and add it to the above beaker, stir mechanically for 5min at a stirring rate of 400rad / min, weigh 20% sodium dodecylsulfonate Methanol was added into the above beaker, and mechanically stirred for 20 minutes to prepare a colorless transparent liquid, which was a reversible physical crosslinking agent.

[0042] The rheological curve (120°C) of the fracturing fluid formulated with 0.2% of the above-mentioned reversible physical cross-linking agent and 0.5% polymer thickener is as follows figure 1 shown.

[0043] 0.2% of the above reversible physical cross-linking agent with 0.5% of polymer thickener (sodium acrylate, hydrophobically associating monomer, sodium p-styrenesulfonate, 2-acrylamide-2-methylpropanesulfonic acid and acrylamide A copolymer of five monomers with a molecular weight of 5...

Embodiment 2

[0047] Example 2: Preparation of reversible physical crosslinking agent.

[0048] Add a certain amount of deionized water into the beaker, heat to 50°C, weigh 25% of sodium dodecylbenzenesulfonate and add it to the above beaker, stir mechanically for 8min at a stirring rate of 500rad / min, weigh 25% Propanol was added into the above beaker and mechanically stirred for 25 minutes to prepare a colorless transparent liquid, which was a reversible physical crosslinking agent.

[0049] The rheological curve (140°C) of the fracturing fluid formulated with 0.25% of the above reversible physical cross-linking agent and 0.55% polymer thickener is as follows figure 2 shown.

[0050] 0.25% of the above-mentioned reversible physical crosslinking agent and 0.55% of polymer thickener (sodium acrylate, hydrophobic association monomer, sodium p-styrenesulfonate, 2-acrylamide-2-methylpropanesulfonic acid, acrylamide A copolymer of five monomers with a molecular weight of 5 million) produces ...

Embodiment 3

[0053] Example 3: Preparation of reversible physical crosslinking agent.

[0054] Add a certain amount of deionized water into the beaker, heat it to 60°C, weigh 40% sodium lauryl polyoxyethylene ether sulfate and add it to the above beaker, stir mechanically for 10min at a stirring rate of 600rad / min, weigh Add 40% butanol into the above beaker, and mechanically stir for 30 minutes to prepare a colorless transparent liquid, which is a reversible physical crosslinking agent.

[0055] The rheological curve (160°C) of the fracturing fluid formulated with 0.3% of the above reversible physical cross-linking agent and 0.6% polymer thickener is as follows image 3 shown.

[0056] 0.3% of the above reversible physical crosslinker with 0.6% of polymer thickeners (sodium acrylate, hydrophobically associating monomer, sodium p-styrenesulfonate, 2-acrylamide-2-methylpropanesulfonic acid and acrylamide A copolymer of five monomers with a molecular weight of 10 million) produces physical...

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Abstract

The invention relates to a reversible physical crosslinking agent and a preparation method thereof. The reversible physical crosslinking agent comprises an anionic surfactant and low carbon alcohol, and forms physical crosslinking with a polymer thickening agent through static electricity, hydrogen bonds or Van der Waals force, so the purpose of thickening is achieved, and good viscoelasticity is obtained. According to the invention, the fracturing fluid prepared from the reversible physical crosslinking agent and the polymer thickening agent is measured at room temperature, wherein the viscosity before shearing is 90 to 340 mPa-s; the viscosity after shearing is measured to be 100 to 300 mPa-s by shearing for 2 hours at 120 to 160 DEG C under 170 S-1 and by temperature cooling to room temperature, so the shearing recoverability is proved to be good; the delayed crosslinking time of the reversible physical crosslinking agent is controllable in 30 to 180 s; and the prepared fracturing fluid has the advantages of low frictional resistance, easy gel breaking, easy flowback and low damage. The reversible physical crosslinking agent has the following advantages: raw materials needed for industrial production have few varieties, extensive sources and low price; the synthetic process has simple operation; and the application prospects is wide.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field reservoir transformation, and in particular relates to a reversible physical crosslinking agent and a preparation method thereof. Background technique [0002] Cross-linking agent is one of the most important additives of water-based fracturing fluid. It interacts with natural polymers or synthetic polymers to form high-viscosity jelly, which makes the fracturing fluid have excellent manufacturing and carrying properties. sand capacity. Commonly used cross-linking agents are roughly divided into chemical cross-linking agents and reversible physical cross-linking agents. [0003] The chemical cross-linking agent and the thickener interact through covalent bonds or coordination bonds to increase the viscosity. There are many reports on this type of cross-linking agent in domestic and foreign literature. Chinese patent CN102040995A discloses a preparation method of a high-temperature dela...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/685
Inventor 杜涛姚奕明蒋廷学陈作张旭东王宝峰周健
Owner CHINA PETROLEUM & CHEM CORP
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