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Clay stabilizer for oil and gas field fracturing and preparation method thereof

A clay stabilizer, oil and gas field technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of anti-swelling performance to be further improved, poor compatibility, etc.

Active Publication Date: 2018-12-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stabilizer can effectively inhibit the hydration swelling and hydration dispersion of clay, but its compatibility is poor, and the anti-swelling performance needs to be further improved

Method used

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  • Clay stabilizer for oil and gas field fracturing and preparation method thereof
  • Clay stabilizer for oil and gas field fracturing and preparation method thereof
  • Clay stabilizer for oil and gas field fracturing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The structural formula of the clay stabilizer used for oil and gas field fracturing in the present embodiment is as follows:

[0028]

[0029] Its preparation steps include:

[0030] 1) Add 146g (1mol) of triethylenetetramine and 1.5g of catalyst potassium hydroxide into the autoclave, and when the temperature rises to 100±5°C, use a vacuum pump to pump it to a gauge pressure of -0.08MPa, and purge it with nitrogen Pipeline and reactor twice, stir and heat up, when the temperature rises to 130±5°C, slowly add 1584g (36mol) of ethylene oxide, control the reaction temperature at 140±5°C, feed speed to maintain gauge pressure 0.25± 0.05MPa, after the reaction is completed, cool to room temperature to obtain a light yellow liquid product;

[0031] 2) Weigh 173g of the above product, add 50g of absolute ethanol and 200g of water, and dropwise add 20g of acetic acid to obtain a transparent clay stabilizer.

Embodiment 2

[0033] The structural formula of the clay stabilizer used for oil and gas field fracturing in the present embodiment is as follows:

[0034]

[0035] Its preparation steps include:

[0036] 1) Add 189g (1mol) of tetraethylenepentamine and 2.0g of catalyst potassium hydroxide into the autoclave, and when the temperature rises to 100±5°C, use a vacuum pump to pump it to a gauge pressure of -0.08MPa, and purge it with nitrogen Pipeline and reactor twice, stir and heat up, when the temperature rises to 130±5°C, slowly add 1232g (28mol) of ethylene oxide, control the reaction temperature at 140±5°C, feed speed to maintain gauge pressure 0.25± 0.05MPa, after the reaction is completed, cool to room temperature to obtain a light yellow liquid product;

[0037] 2) Weigh 142g of the above product, add 50g of absolute ethanol and 200g of water, dropwise add 55g of sodium chloroacetate, heat up to 80°C for reflux reaction for 8h, and cool to obtain a transparent clay stabilizer.

Embodiment 3

[0039] The structural formula of the clay stabilizer used for oil and gas field fracturing in the present embodiment is as follows:

[0040]

[0041] Its preparation steps include:

[0042] 1) Add 253.5g of polyethylene polyamine (0.5mol each of pentaethylenehexamine and hexaethyleneheptamine) and 2.5g of catalyst potassium hydroxide into the autoclave, and when the temperature rises to 100±5°C, pump it up with a vacuum pump When the gauge pressure is -0.08MPa, purge the pipeline and the reactor twice with nitrogen, stir and raise the temperature. When the temperature rises to 130±5°C, slowly add 1870g (42.5mol) of ethylene oxide, and control the reaction temperature at 140 ±5°C, the feed rate is to maintain a gauge pressure of 0.25±0.05MPa, after the reaction is completed, cool to room temperature to obtain a light yellow liquid product;

[0043] 2) Weigh 142g of the above product, add 50g of absolute ethanol and 200g of water, dropwise add 52.8g of methyl chloride, heat ...

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Abstract

The invention discloses a clay stabilizer used for oil and gas field fracturing and a preparation method thereof and belongs to the technical field of oil and gas filed exploitation. With polyethylene polyamine being an initiator, the initiator and ethylene oxide and / or propylene oxide are subjected to a ring opening addition reaction, and then an amine cationization reaction is performed to prepare the clay stabilizer which can effectively prevent clay and clay shale from expanding. Compatibility between the clay stabilizer and all kinds of water-soluble polymer thickening agents, particularly an artificially synthesized polyacrylamide macromolecule drag-reduction agent is good, and the clay stabilizer is suitable for being used for drag-reduction water fracturing fluid of oil and gas field large-scale volume fracturing, wherein the structural general formula of the clay stabilizer is displayed as follows.

Description

technical field [0001] The invention relates to a clay stabilizer for oil and gas field fracturing, and also relates to a preparation method of the clay stabilizer, which belongs to the technical field of oil and gas field exploitation. Background technique [0002] The reservoirs of oil and gas fields all contain a certain amount of clay minerals (such as kaolin, montmorillonite, illite, chlorite, illite-montmorillonite, etc.), and when the reservoir is subjected to water-based fracturing, the clay will expand and migrate. It is very easy to block the formation pores and throats of the pore structure, reduce the permeability of the formation, and result in reduced production of oil wells. [0003] In order to reduce the hydration swelling of clay minerals, an anti-swelling agent must be added to the fracturing fluid to stabilize the clay. At present, domestic oilfields often use quaternary ammonium salt cationic polymers, such as polyepichlorohydrin-dimethylamine, polytrim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C08G65/332C08G65/26
CPCC08G65/2624C08G65/3322C08G2650/50C09K8/608C09K8/68C09K8/885C09K2208/12
Inventor 罗懿李国锋姚昌宇胡艾国王迁伟赵楠黄启亮邱小庆王娟娟徐成法王璇王瑞霞
Owner CHINA PETROLEUM & CHEM CORP
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