A salt-resistant fracturing fluid thickener and preparation method thereof

A fracturing fluid thickener and salt-type technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of high market price of betaine salt-resistant monomer, which is not suitable for large-scale promotion and application, Tolerate the problems of high salinity and limited improvement, achieve the effect of shortening the preparation time, avoiding steric hindrance between groups, and good temperature and salt resistance

Active Publication Date: 2022-04-12
JIANGSU FEYMER TECH
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Problems solved by technology

[0003] In the prior art, researchers have introduced a single salt-resistant monomer for copolymerization, so that the polymer has the ability to withstand high salinity. Among them, common salt-resistant monomers have certain defects, such as cationic salt-resistant monomers. The improvement of the product's tolerance to high salinity is limited, and the market price of some betaine-based salt-resistant monomers is relatively high, which is not suitable for large-scale promotion and application
In addition, in the preparation process of the existing salt-resistant polymer, a large amount of thermal initiator needs to be added, resulting in more residual initiator in the product. However, under high temperature and high salt conditions, the residual thermal initiator will decompose and attack the polymer chain. Reduce the viscosity of the product, causing side effects

Method used

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  • A salt-resistant fracturing fluid thickener and preparation method thereof

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preparation example Construction

[0027] The invention provides a preparation method of a salt-resistant fracturing fluid thickener, comprising the following steps:

[0028] Step 1. Add the salt-resistant monomer, acrylamide, chelating agent, co-solvent, initiator and deionized water into the container for mixing and dissolving, and adjust the pH of the solution to 6.5-7.5;

[0029] Step 2. Open the nitrogen valve to vent nitrogen and remove oxygen for 20-30 minutes;

[0030] Step 3. Turn on the polymerization lamp, put the solution under the ultraviolet light for 50-80 minutes, and light polymerization;

[0031] Step 4. Take out the rubber block, send the rubber block product to a granulator for granulation, and send it to a fluidized bed for drying after granulation. After drying, send it to a pulverizer for crushing, and then sieve according to the particle size requirements. After packaging Then send it to the finished product warehouse for storage.

[0032] In the present invention, by selecting monomer...

Embodiment 1

[0049] Add 19% acrylamide, 4% N-vinylpyrrolidone and 4% AMPS to a 1L beaker, add 0.04% EDTA solution, neutralize with 32% caustic soda to pH = 7.5, add 2% co-solvent (co-solvent is nano Cellulose) and 0.01% initiator solution (2,2'- azobisisobutylamidine dihydrochloride and azobisisopropylimidazoline hydrochloride 1:1), add water to a total weight of 600g, After completely dissolving, pass nitrogen for 20 minutes, irradiate under ultraviolet light for 60 minutes, take out the rubber block and granulate, dry and pulverize at 50° C. to obtain a 0.5% solution in compound brine (4.9% sodium chloride and 0.1% calcium chloride) with a molecular weight of 16.13 million A product with a viscosity of 59.3 cp and a dissolution time of 14 minutes.

Embodiment 2

[0051] Add 20% acrylamide, 4% N,N-dimethylacrylamide and 4% AMPS into a 1L beaker, add 0.03% EDTA solution, neutralize with 32% caustic soda to pH = 7.5, add 2% co-solvent ( The cosolvent is nanocellulose) and 0.015% initiator solution (4,4'-azobis(4-cyanovaleric acid) and azodiisopropylimidazoline hydrochloride 1:1), replenishing water to total The weight is 600g, after completely dissolving, pass nitrogen for 20min, irradiate under ultraviolet light for 70min, take out the rubber block and granulate, dry and pulverize at 50°C, obtain molecular weight 16.59 million, compound brine (4.9% sodium chloride and 0.1% calcium chloride) A product with a 0.5% solution viscosity of 61.7cp and a dissolution time of 13 minutes.

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Abstract

The invention discloses a salt-resistant fracturing fluid thickener and a preparation method thereof, belonging to the field of organic polymer compound preparation. The method includes the following steps: adding salt-resistant monomer, acrylamide, chelating agent, cosolvent, initiator and deionized water into a container for mixing and dissolving, adjusting the pH of the solution to 6.5-7.5; purging nitrogen and deoxygenating for 20-30 minutes; placing the solution in Irradiate under ultraviolet light for 50-80 minutes; take out the rubber block, granulate, dry, crush, and sieve. The invention uses salt-tolerant monomers, polymer stabilizers and acrylamide to initiate polymerization under ultraviolet light, with simple process, rapid response and convenient adjustment. The obtained product has high molecular weight (≥15 million), fast dissolution speed and strong salt resistance (resistant to 50,000 salinity), and has a good application effect in the field of fracturing fluid thickening.

Description

technical field [0001] The invention belongs to the field of preparation of organic polymer compounds, in particular to a salt-resistant fracturing fluid thickener and a preparation method thereof. Background technique [0002] Fracturing is a commonly used oil stimulation operation. The fracturing fluid used needs sufficient viscosity to transmit power, reduce fluid loss and carry proppant. Efficient fracturing fluid thickener is very important. Compared with plant polysaccharides such as guar gum and coumar gum, synthetic polymer thickeners have a stable source, easy adjustment, excellent temperature resistance, and no residue, and have been widely used. On this basis, the present invention prepares a polymer product with high molecular weight, good salt resistance and fast dissolution speed with a simpler and easier operation process, which is very beneficial for reducing production cost, enhancing thickening effect and facilitating on-site construction. [0003] In the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/54C08F226/10C08F2/48C08F2/44C09K8/68
CPCC08F220/56C08F2/48C08F2/44C09K8/685C08F220/585C08F220/54C08F226/10
Inventor 杨开吉朱冠英李平王勤吴江勇
Owner JIANGSU FEYMER TECH
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