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Oil-based self-suspending polymer thickening agent and preparation method thereof

A polymer and self-suspension technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of many types of additions, adverse effects on performance such as flowback of fracturing fluid residues, and large amounts of additions, etc., to achieve residue less, high demulsification rate, good compatibility

Active Publication Date: 2022-02-18
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an oil-based self-sustaining agent for the current suspension polymer thickener in which the amount of suspension aid is large and the types of addition are large, and it is easy to cause adverse effects on the performance of fracturing fluid residue and flowback. Suspension polymer thickener and preparation method thereof; the thickener obtains a certain self-suspension performance by modifying polyacrylamide, and adds it to mineral spirits to obtain a polymer suspension without adding Stabilizer, cutting agent, suspending agent and other additives to stabilize the suspended polymer, the polymer is self-suspended in solvent oil

Method used

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  • Oil-based self-suspending polymer thickening agent and preparation method thereof
  • Oil-based self-suspending polymer thickening agent and preparation method thereof
  • Oil-based self-suspending polymer thickening agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1000g of n-hexane to the four-neck flask, add 100g of partially hydrolyzed polyacrylamide powder (100 mesh, molecular weight of 30 million, degree of hydrolysis 40%), add 6g of n-octanol, and add 1g of p-toluenesulfonic acid. Add a condenser and a water separator to the four-necked bottle, stir it with a magnetic force, and heat it in an oil bath. After the reflux reaction for 4 hours, the water level in the water separator does not change anymore, stop heating, cool down to room temperature, filter, put the obtained solid powder in a vacuum drying oven, and dry it in vacuum at 120°C for 4 hours to obtain the modified polymer powder 104.2g.

[0025] Take 50g of the above-mentioned modified polymer powder, add it into 50g of 10# white oil, and mechanically stir at 500r / min for 1h to obtain oil-based self-suspension polymer thickener A.

Embodiment 2

[0027] Add 1000g of petroleum ether with a boiling point of 60~90°C to the four-necked bottle, add 200g of partially hydrolyzed polyacrylamide powder (80 mesh, molecular weight of 40 million, degree of hydrolysis 45%), add 15g of lauryl alcohol, and add 2-naphthalenesulfonic acid 4g. Add a condenser and a water separator to the four-necked bottle, stir it with a magnetic force, and heat it in an oil bath. After the reflux reaction for 6 hours, the water level in the water separator does not change anymore, stop heating, cool down to room temperature, filter, put the obtained solid powder in a vacuum drying oven, and vacuum dry at 120°C for 4 hours to obtain the modified polymer powder 211.6g.

[0028] Take 120g of the above-mentioned modified polymer powder, add it into 110g of 15# white oil, and mechanically stir at 600r / min for 2h to obtain oil-based self-suspending polymer thickener B.

Embodiment 3

[0030] Add 2000g of toluene to the four-necked flask, add 100g of partially hydrolyzed polyacrylamide powder (120 mesh, molecular weight of 15 million, degree of hydrolysis 25%), add 10g of isobutanol, and add 5g of benzenesulfonic acid. Add a condenser and a water separator to the four-necked bottle, stir it with a magnetic force, and heat it in an oil bath. After reflux reaction for 3 hours, the water level in the water separator does not change anymore, stop heating, cool down to room temperature, filter, put the obtained solid powder in a vacuum drying oven, and dry it in vacuum at 120°C for 5 hours to obtain the modified polymer powder 107.2g.

[0031] Take 40g of the above-mentioned modified polymer powder, add it into 50g of 5# white oil, and stir it mechanically at 300r / min for 40min to obtain oil-based self-suspension polymer thickener C.

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Abstract

The invention discloses an oil-based self-suspending polymer thickening agent and a preparation method thereof, belongs to the field of oilfield yield increasing chemical agents, and relates to a thickening agent for fracturing fluid. According to the thickening agent disclosed by the invention, a polymer is modified to obtain a certain self-suspending property, and the polymer is added into solvent oil to obtain an oil-based self-suspending polymer thickening agent suspension. The polymer of the thickening agent is self-suspended in the solvent oil, so that a stabilizer, a shear strength improving agent, a suspending agent and other auxiliaries do not need to be added; and the oil-based self-suspending polymer thickening agent has the advantage of high polymer content of a suspension type thickening agent, no additional suspending auxiliaries are added, the residue content of a gel breaking solution is low, and the demulsification rate is high.

Description

technical field [0001] The invention relates to a thickener for fracturing fluid, in particular to an oil-based self-suspending polymer thickener for preparing hydraulic fracturing fluid and a preparation method of the thickener. Background technique [0002] Fracturing technology is a conventional stimulation technology, and the thickeners that can be used for hydraulic fracturing are divided into three formulations: powder, emulsion and suspension. The thickener powder can be obtained by directly drying and pulverizing the solid polymer or guar gum (sometimes modified); while the emulsion is generally obtained by adding emulsifiers, suspending agents and other additives during the polymer synthesis process, and then polymerizing. The suspension is obtained by adding polymer or guar gum powder, dispersant, cutting agent, stabilizer and other ingredients into the solvent and stirring. For polymer thickeners, the three dosage forms have their own advantages and disadvantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F20/56C08F8/14C09K8/68
CPCC08F8/14C09K8/68C09K8/882C08F20/56
Inventor 范友泉张昕闫利刚曾从良张卓丁秋炜滕大勇周柄男张宇王素芳
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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