A kind of temperature-resistant and salt-resistant anti-swelling clay stabilizer and its synthesis method

A technology of clay stabilizer and synthesis method, which is applied in the direction of chemical instruments and methods, drilling compositions, preparation of organic compounds, etc., which can solve the problem of limiting application range, reducing formation permeability, and clay stabilizer's heat and salt resistance To achieve the effect of wide range of raw material sources, good compatibility and strong reservoir adaptability

Active Publication Date: 2019-08-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stabilizer is easy to adsorb to the rock surface, reducing the permeability of the formation, or directly blocking the formation. At the same time, the clay stabilizer has poor heat and salt resistance, which limits its application range

Method used

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  • A kind of temperature-resistant and salt-resistant anti-swelling clay stabilizer and its synthesis method
  • A kind of temperature-resistant and salt-resistant anti-swelling clay stabilizer and its synthesis method
  • A kind of temperature-resistant and salt-resistant anti-swelling clay stabilizer and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Clay Stabilizer A 1 and its preparation method

[0027] (1) Clay Stabilizer A 1 The composition, components and molecular formula are as follows:

[0028] Clay Stabilizer A 1 It is obtained by reacting phthalic anhydride, n-octanol, dimethylaminomethane chloride and benzyl bromide in a molar ratio of 1:0.9:1.1:1.3. Its molecular formula is as follows:

[0029]

[0030] (2) Clay Stabilizer A 1 The synthesis method is as follows:

[0031] ① Add 1mol of phthalic anhydride and 0.9mol of n-octanol into a four-neck flask, heat to 60°C, stir at 200rpm, and react for 1h, then add 1481.1g of n-heptane, react for 2h, then Cool down to room temperature and stir for 15 minutes to obtain n-octyl phthalic anhydride half ester solution;

[0032] ②Add 1.1 mol of dimethylaminomethane chloride to the above half-octyl phthalic anhydride solution, and react while stirring. The stirring rate is 330rpm, and the reaction time is 5h. Reaction, the stirring rate is 400rp...

Embodiment 2

[0037] Example 2: Clay Stabilizer A 2 and its preparation method

[0038] (1) Clay Stabilizer A 2 The composition, components and molecular formula are as follows:

[0039] Clay Stabilizer A 2It is obtained by reacting phthalic anhydride, n-octanol, dimethylaminomethane chloride and benzyl bromide in a molar ratio of 1:1.1:1.3:1.6. Its molecular formula is as follows:

[0040]

[0041] (2) Clay Stabilizer A 2 The synthesis method is as follows:

[0042] ① Add 1mol of phthalic anhydride and 1.1mol of n-octanol into a four-neck flask, heat to 70°C, stir at 220rpm, and react for 1.5h, then add 1856.3g of n-heptane, and react for 4h. Cool to room temperature subsequently, stir 20min, obtain n-octyl phthalic anhydride half ester solution;

[0043] ②Add 1.3 mol of dimethylaminomethane chloride to the n-octyl phthalic anhydride half-ester solution, and react while stirring. The stirring rate is 300rpm, and the reaction time is 10h. Reaction, the stirring rate is 500rpm, the...

Embodiment 3

[0048] Example 3: Clay Stabilizer A 3 and its preparation method

[0049] (1) Clay Stabilizer A 3 The composition, components and molecular formula are as follows:

[0050] Clay Stabilizer A 3 It is obtained by reacting phthalic anhydride, n-octanol, dimethylaminomethane chloride and benzyl bromide in a molar ratio of 1:1.2:1.5:1.8. Its molecular formula is as follows:

[0051]

[0052] (2) Clay Stabilizer A 3 The synthesis method is as follows:

[0053] ①Add 1mol of phthalic anhydride and 1.2mol of n-octanol into a four-neck flask, heat to 80°C, stir at 250rpm, and react for 2h, then add 2221.6g of n-heptane, react for 6h, then Cool down to room temperature and stir for 30 minutes to obtain n-octyl phthalic anhydride half ester solution;

[0054] ② Add 1.5 mol of dimethylaminomethane chloride to the n-octyl phthalic anhydride half-ester solution, and react while stirring. The stirring rate is 350rpm, and the reaction time is 8h. Reaction, the stirring rate is 450rpm...

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Abstract

The invention belongs to the technical field of oilfield development, and specifically relates to a temperature-resistant and salt-resistant type anti-swelling clay stabilizer and a synthetic method thereof. The temperature-resistant and salt-resistant type anti-swelling clay stabilizer is prepared through the following steps of enabling phthalic anhydride to react with n-octyl alcohol, thus generating n-octyl phthalic anhydride hemi-ester; carrying out a solution polymerization reaction on the n-octyl phthalic anhydride hemi-ester and 2-(dimethylamino) chloromethane hydrochloride, thus generating an intermediate; finally enabling the intermediate to react with benzyl bromide, thus generating the temperature-resistant and salt-resistant type anti-swelling clay stabilizer, wherein a molar ratio of the phthalic anhydride, the n-octyl alcohol, the 2-(dimethylamino) chloromethane hydrochloride and the benzyl bromide is 1 to 1.1 to 1.3 to 1.6. The temperature-resistant and salt-resistant type anti-swelling clay stabilizer disclosed by the invention has the characteristics that the sources of raw materials are wide, a synthetic technology is simple, the dosage is less, and the oil reservoir adaptability is strong; the temperature-resistant and salt-resistant type anti-swelling clay stabilizer is good in temperature resistance and salt resistance, the temperature resistance can reach 250 DEG C, the mineralization resistance degree can reach 200,000 mg / L, and good compatibility is obtained; the temperature-resistant and salt-resistant type anti-swelling clay stabilizer can be forcefully adsorbed to the surface of clay and is not easy to decompose, long in validity period and high in anti-swelling rate, and the anti-swelling rate can reach 98 percent or more.

Description

technical field [0001] The invention belongs to the technical field of oilfield development, and in particular relates to a temperature-resistant and salt-resistant anti-swelling clay stabilizer and a synthesis method thereof. Background technique [0002] The formation contains a certain amount of clay minerals, mainly kaolinite, montmorillonite, illite and chlorite. These clays will swell when they encounter water or water-based substances during water injection, acidification, and fracturing, and then further disperse (such as montmorillonite, chlorite) or directly disperse (such as kaolinite, illite) into diameters. Fine particles smaller than 10 μm. Under normal circumstances, from the upper layer to the lower layer, the content of montmorillonite in oil-bearing reservoirs decreases, the content of illite increases, kaolinite disappears at a certain depth, and chlorite is mainly distributed in deep layers. Most of these clay minerals have a layered structure composed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08
CPCC07C67/08C07C213/08C09K8/035C09K2208/12C07C69/78C07C219/14
Inventor 张松亭王志坚荣雁杨胜利白昕杜春安陈晓春马天态孙立柱陶建强杨再新
Owner CHINA PETROLEUM & CHEM CORP
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