Crosslinking agent for sea water-based fracturing fluid as well as preparation method and application of crosslinking agent
A technology of cross-linking agent and base pressure, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of affecting the sand-carrying ability of fracturing fluid, affecting the cross-linking performance of cross-linking agent, and the low cross-linking strength of jelly To achieve the effects of improving offshore fracturing efficiency, easy flowback, and superior viscoelasticity
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[0035] On the other hand, based on the same inventive concept, the embodiment of the present invention provides a method for preparing the above crosslinking agent, see figure 1 ,include:
[0036] Step S101: The water and polyol are mixed and heated to completely dissolve the polyol to prepare a polyol solution; wherein the polyol dissolving temperature is 40° C., heating for 10-15 minutes, so that the polyol is quickly and fully dissolved.
[0037] Among them, the polyol is one or a mixture of two of triethanolamine, pentaerythritol and glycerol.
[0038] Step S102: Under stirring conditions, add organic acid, inorganic acid, and inorganic zirconium salt to the polyol solution to obtain a reaction system; wherein the weight ratio of water, polyol, organic acid, inorganic acid, and inorganic zirconium salt is 50~60:10~20:10~15:1~5:3~8;
[0039] Among them, the organic acid is one of citric acid, lactic acid, and acetic acid; the inorganic acid is hydrochloric acid; and the inorganic z...
Example Embodiment
[0046] Example 1
[0047] Weigh 50 parts of water and 15 parts of pentaerythritol according to the weight ratio and add them to a reactor equipped with a stirring and reflux device. At the same time, the temperature in the reactor is heated to 40° C. and preheated for 10 minutes to completely dissolve the pentaerythritol. Then, under stirring conditions, 12 parts of lactic acid, 3 parts of hydrochloric acid, and 5 parts of zirconium oxychloride octahydrate were sequentially added to the reaction kettle. Stirring is continued while raising the temperature in the reaction kettle to 65°C, and reacting at this temperature for 4.5 hours to obtain a light yellow uniform liquid, which is the crosslinking agent.
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[0048] Example 2
[0049] Weigh 55 parts of water and 18 parts of pentaerythritol according to the weight ratio and add them to a reactor equipped with a stirring and reflux device. At the same time, the temperature in the reactor is heated to 40° C. and preheated for 15 minutes to completely dissolve the pentaerythritol. Then under stirring conditions, 15 parts of acetic acid, 3 parts of hydrochloric acid, and 6 parts of zirconium oxychloride octahydrate were sequentially added to the reaction kettle. Stirring is continued while increasing the temperature in the reaction kettle to 60°C, and reacting at this temperature for 5.5 hours to obtain a pale yellow liquid, which is the crosslinking agent.
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