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A composite cross-linking agent, cationic technology, used in titanium organic compounds, drilling compositions, chemical instruments and methods, etc. The effect of improving water solubility, increasing viscosity, and being less prone to corruption
Inactive Publication Date: 2021-08-13
广州市尚信净化工程有限公司
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[0003] Water-based fracturing fluid is the most widely used fracturing fluid system in the process of oil exploitation. At present, cellulose or modified cellulose in plant polysaccharides is mostly used as the main base fluid, which is widely used in sandstone and limestone formations; while The water-based fracturing fluid system has problems such as serious damage to water-sensitive formations, difficulty in ultra-high temperature resistance, high water-insoluble matter, difficulty in gel breaking, filtration loss, decreased viscosity after modification, and corruption of gel-breaking residues. Therefore, it is necessary to develop a Fracturing fluids with high viscosity, high temperature resistance and less gel-breaking residue are of great significance
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Embodiment 1
[0028] The preparation of embodiment 1 cationic locust bean gum
[0029] Dissolve 1.0-5.0g LBG in 100mL isopropanol solution, add 5-20mL 5% (w / v) NaOH solution, stir magnetically at room temperature for 2 hours, add 0.1-5.0g 2,3-epoxypropyltri Methylammonium chloride (Glytac) was stirred evenly, and continued to stir for 6 h at 60-80°C. After the reaction was completed, the solution obtained was poured into 200 mL of methanol containing 35% (w / v) HCl, and the precipitate was obtained by suction filtration. The precipitate was washed with methanolaqueous solution and filtered, and dried under reduced pressure to obtain cationic locust bean gum;
[0030] Among them, the molar ratio of LBG to Glytac is 1:0.1~2, and the addition amount is shown in Table 1;
[0031] Table 1: The amount of LBG and Glytac added
[0032]
[0033] According to (SY / T 5107-2016) assay method, carry out substitution degree, number average molecular weight (Mn) and viscosity investigation to embodime...
Embodiment 2
[0041] The preparation of embodiment 2 organic boron-titanium composites
[0042] Add 25g of ethylene glycol, 25g of triethanolamine, and 10g of butyl titanate into a three-necked flask in turn, and stir it magnetically. After the solution turns from milky white to clear, add 3g of sodium tetraborate, adjust the pH to 4-5 with HCl, and control The temperature was slowly raised to 80°C and reacted for 2 hours to obtain a light yellow transparent liquid with a certain viscosity.
Embodiment 3
[0043] Embodiment 3 Preparation of water-based fracturing fluid
[0044] Slowly add 0.1-0.5% (w / v) cationic locust bean gum (1-4 in Example 1) into distilled water, stir evenly with magnetic force to form a uniform solution, add 0.001-0.005% (w / v) after standing ) organoboron-titanium complex (Example 2), 1% (w / v) sulfonatefluorocarbon surfactant, 0.3% (w / v) ammoniumsulfate, magnetically stirred for 10 minutes to form colorless transparent water base fracturing fluid;
[0045] Wherein the massconcentration ratio of cationic locust bean gum and organic boron-titanium complex is 99:499-1, and the addition amount is shown in Table 2;
[0046] Table 2: Addition amount of cationic locust bean gum and organic boron-titanium complex
[0047]
[0048]3) According to the measurement method (SY / T 5107-2016), the gel breaking time, high temperature resistance (7.9), sedimentation velocity (calculation of resistance reduction rate in 7.12), residue amount (7.10, 7.10.2 formula Ca...
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Abstract
The invention relates to an organic boron-titanium composite cross-linking agent-cationic locust bean gum water-based fracturing fluid, the water-based fracturing fluid is mainly cross-linked through cationic locust bean gum and an organic boron-titanium composite cross-linking agent, quaternaryammonium salt cations are introduced into the structure of the cationic locust bean gum, water insoluble substances are reduced, residues are few after gel breaking, the adhesive property is good, the antibacterial effect is achieved, and corrosion is not prone to occurring; the organic boron-titanium composite cross-linking agent is obtained through coordination with organic alcohol; when the cationic locust bean gum reacts with the organic boron-titanium composite cross-linking agent, an organic ligand of the organic boron-titanium complex reacts with cis-ortho-hydroxyl on a galactomannan chain in the cationic locust bean gum to form three-dimensional network jelly with a stable structure of 1: 1 or 2: 1; the fracturing fluid gel provided by the invention has the advantages of good crosslinking performance, sand carrying property, high temperature resistance, antibacterial property and lower gel breaking residue.
Description
technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to an organic boron-titanium composite crosslinking agent-cationic locust bean glue water-based fracturing fluid. [0002] technical background [0003] Water-based fracturing fluid is the most widely used fracturing fluid system in the process of oil exploitation. At present, cellulose or modified cellulose in plant polysaccharides is mostly used as the main base fluid, which is widely used in sandstone and limestone formations; while The water-based fracturing fluid system has problems such as serious damage to water-sensitive formations, difficulty in ultra-high temperature resistance, high water-insoluble matter, difficulty in gel breaking, filtration loss, decreased viscosity after modification, and corruption of gel-breaking residues. Therefore, it is necessary to develop a Fracturing fluids with high viscosity, high temperature resistance and less ge...
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