Low-residue salt-tolerant fracturing fluid preparation method

A fracturing fluid and low-residue technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as high residue content, incomplete gel breaking of fracturing fluid, and reduction of fracturing fluid consistency

Pending Publication Date: 2019-10-22
欧志飞
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved by the present invention is to provide a low-residue salt-resistant fracturing fluid for the defects that the current fracturing fluid is not completely broken, the residue content is high after the gel is broken, and the consistency of the fracturing fluid will be reduced due to the erosion of the salt solution. preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] Preparation of cationic etherifying agent:

[0031] Add 150mL epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 40mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate for 4 hours, filter and separate to obtain a white solid product, put it in a vacuum oven with a set temperature of 70°C, and dry for 6 hours to obtain a cationic etherification agent.

[0032] Preparation of cationic hydroxyethyl cellulose:

[0033] Add 30g of hydroxyethyl cellulose, 120mL of 15% sodium hydroxide solution and 8g of cationic etherification agent into the reactor, stir and react for 1h to obtain a reaction product, and use 20% of hydrochloric acid to dissolve the reaction product And, to obtain the suspension, put the suspension in a high-speed centrifuge at a speed of 2000r / min for 8min, remove the upper layer, collect ...

example 2

[0043] Preparation of cationic etherifying agent:

[0044] Add 155mL of epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 45mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate for 4 hours, filter and separate to obtain a white solid product, put it in a vacuum oven with a set temperature of 75°C, and dry for 6 hours to obtain a cationic etherification agent.

[0045] Preparation of cationic hydroxyethyl cellulose:

[0046] Add 33g of hydroxyethyl cellulose, 130mL of 15% sodium hydroxide solution and 9g of cationic etherification agent into the reactor, stir and react for 1h to obtain a reaction product, and use 20% of hydrochloric acid to dissolve the reaction product into And, to obtain a suspension, put the suspension in a high-speed centrifuge at a speed of 2500r / min for 9min, remove the upper layer, co...

example 3

[0056] Preparation of cationic etherifying agent:

[0057] Add 160mL of epichlorohydrin to a three-necked flask with a stirrer and a ventilation tube, place the three-necked flask in an ice-water bath, pass trimethylamine gas into the three-necked flask at a ventilation rate of 50mL / min, start the agitator, and Stir at a speed of 1 / min, ventilate for 5 hours, filter and separate to obtain a white solid product, put it into a vacuum drying oven with a set temperature of 80°C, and dry for 7 hours to obtain a cationic etherification agent.

[0058] Preparation of cationic hydroxyethyl cellulose:

[0059] Add 35g of hydroxyethyl cellulose, 140mL of 15% sodium hydroxide solution and 10g of cationic etherification agent to the reactor, stir and react for 2h to obtain a reaction product, and use 20% of hydrochloric acid to dissolve the reaction product into and, to obtain a suspension, place the suspension in a high-speed centrifuge at a speed of 3000r / min for 10 minutes, remove the...

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Abstract

The invention relates to a low-residue salt-tolerant fracturing fluid preparation method, and belongs to the technical field of fracturing fluid preparation. The preparation method comprises: mixing dimethylallylamine, chloroacetic acid and a sodium hydroxide solution to obtain a light yellow viscous liquid, introducing chlorine gas into the light yellow viscous liquid, carrying out heating distillation, adding anhydrous ethanol, cationic hydroxyethyl cellulose, river sand and an encapsulation gel breaker, and carrying out a stirring reaction to obtain the low-residue salt-resistant fracturingfluid. According to the present invention, the amphoteric cellulose ether in the fracturing fluid can effectively weaken and prevent the free water molecules in the aqueous fracturing fluid from hydration on the surface of the fracturing fluid particles and the pigment so as to improve the hydration dispersibility of the guar gum, completely break the gel and reduce the residue; the used guar gumcan improve the static viscosity of the aqueous fracturing fluid by rapidly hydrating with the water molecules through hydrogen bonding; and a large number of the cationic groups have good repellencyto the metal cation, such that the fracturing fluid has good salt-tolerant stability and has broad application prospects.

Description

technical field [0001] The invention relates to a preparation method of a low-residue salt-resistant fracturing fluid, which belongs to the technical field of fracturing fluid preparation. Background technique [0002] Fracturing is one of the main production stimulation measures for low-permeability oil and gas reservoirs. It is a method of forming cracks in oil and gas layers by using hydraulic action, also known as oil and gas layer hydraulic fracturing. People use the surface high-pressure pump group to inject high-viscosity liquid into the well with a displacement that greatly exceeds the energy absorbed by the formation. With the formation of high pressure near the bottom of the well, after the pressure exceeds the ground stress near the bottom of the well and the expansion strength of the rock, the fracture extends forward and fills the proppant in the fracture, and a sufficient length can be formed in the formation after the pump is stopped. , sand-filled cracks of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C08B11/08
CPCC08B11/08C09K8/68C09K2208/24
Inventor 欧志飞
Owner 欧志飞
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