A kind of preparation method of polyhydric alcohol fracturing fluid cross-linking agent
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A polyhydric alcohol and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting the use of fracturing fluid, the temperature of the gel is not resistant to temperature, and the delay time is long, and the delay time is reached. Controllable, good temperature and shear resistance, and simple preparation process
Active Publication Date: 2016-04-06
PETROCHINA CO LTD
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Problems solved by technology
The cross-linking speed of borax is extremely fast, and the jelly formed by the organic boron / polyhydric alcohol fracturing fluid system is not resistant to temperature, which affects the use of fracturing fluid
Organic titanium crosslinking agent has good temperature resistance and adjustable crosslinking speed, but its compatibility with polyhydric alcohol fracturing fluid system is poor and the delay time is too long
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Embodiment 1
[0026] Add 300g of diethanolamine to a reaction kettle equipped with an automatic decompression dehydration device, heat and stir, and when it reaches 60°C, add 280g of borax, 15g of hydrochloric acid catalyst, adjust the pH to 8, 220g of ethylenediamine, and 220g of xylitol. Rapidly raise the temperature to 90°C, react for 5 hours, dehydrate under reduced pressure, then cool down to 50°C, add antifreeze stabilizer glycerin and water to compound, and obtain a light yellow liquid that is the polyhydric alcohol fracturing fluid crosslinking agent.
Embodiment 2
[0028] Add 220g of triethanolamine to a reaction kettle equipped with an automatic decompression dehydration device, heat and stir, and when it reaches 50°C, add 280g of borax, 15g of hydrochloric acid catalyst, adjust the pH to 9, 200g of dimethylamine, and 200g of xylitol. Rapidly raise the temperature to 100°C, react for 4 hours, dehydrate under reduced pressure, then cool down to 50°C, add antifreeze stabilizer glycerin and water to compound, and obtain a light yellow liquid that is the polyhydric alcohol fracturing fluid crosslinking agent.
Embodiment 3
[0030] Add 220g of diethanolamine to a reaction kettle equipped with an automatic decompression dehydration device, heat and stir, and when it reaches 60°C, add 280g of borax, 15g of hydrochloric acid catalyst, adjust the pH to 9, 200g of trimethylamine, and 200g of xylitol. Rapidly raise the temperature to 100°C, react for 5 hours, dehydrate under reduced pressure, then cool down to 60°C, add antifreeze stabilizer glycerin and water to compound, and obtain a light yellow liquid that is the polyhydric alcohol fracturing fluid crosslinking agent.
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Abstract
The invention relates to a preparation method for a polyhydroxy-alcohol fracturing fluid cross-linking agent. The preparation method comprises the following steps: adding an alcamine reaction solvent into a reaction vessel; heating the solvent to a temperature of 50 to 60 DEG C, adding borax and a hydrochloric acid catalyst according to a ratio of 30: 1, adjusting a pH value to 8 to 10, adding amine and xylitol and heating to a temperature of 90 to 100 DEG C, wherein a mass ratio of borax to the catalyst to alcamine to amine is 15-20: 1: 20-25: 10-15; carrying out a reaction for 5 h and then carrying out dehydration so as to obtain a main agent; and cooling the main agent to a temperature below 60 DEG C, adding water and antifreezing stabilizer glycerin according to a ratio of 1: 15 and carrying out uniform stirring so as to obtain faint yellow liquid which is the cross-linking agent for the polyhydroxy-alcohol fracturing fluid; wherein alcamine is diethanolamine or triethanolamine, and amine is ethene diamine , dimethylamine or trimethylamine. The method endows the polyhydroxy-alcohol fracturing fluid cross-linking agent / a polyhydroxy-alcohol fracturing fluid system with good delay, heatproof and anti-shearing performance; and the system has the advantages of easy gel breaking and low residue content.
Description
technical field [0001] The invention relates to a preparation method of a polyhydric alcohol fracturing fluid cross-linking agent suitable for use in natural gas well fracturing stimulation technology. Background technique [0002] In the prior art, polyhydric alcohol fracturing fluid is a new type of fracturing fluid, in which the molecular weight of the thickener is much lower than that of vegetable gum, and has high surface activity. , easy flowback, low damage and other advantages, has a good application prospect. [0003] The role of the cross-linking agent in the fracturing fluid system is to make the polymer sol into a jelly, thereby greatly increasing the viscosity of the fracturing fluid, meeting the needs of fracturing and sand-carrying, and at the same time, it is the main factor determining the temperature resistance of the fracturing fluid. factor. Therefore, the cross-linking agent plays an important role and is a key component of the fracturing fluid, which ...
Claims
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