Cation-type anti-swelling clay stabilizer containing N-heterocyclic quaternary ammonium salt and synthesis method thereof

A quaternary ammonium salt cation and clay stabilizer technology, applied in chemical instruments and methods, drilling compositions, organic chemistry, etc., can solve the problem of reducing formation permeability, limiting application range, clay stabilizer temperature and salt resistance To achieve good compatibility, low cost, and strong reservoir adaptability

Active Publication Date: 2017-06-20
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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  • Cation-type anti-swelling clay stabilizer containing N-heterocyclic quaternary ammonium salt and synthesis method thereof
  • Cation-type anti-swelling clay stabilizer containing N-heterocyclic quaternary ammonium salt and synthesis method thereof
  • Cation-type anti-swelling clay stabilizer containing N-heterocyclic quaternary ammonium salt and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: Clay Stabilizer C 1 and its preparation method

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

[0028] Clay Stabilizer C 1 It is obtained by reacting naphthalene anhydride, n-dodecyl alcohol, 2-(dimethylamino)chloromethane hydrochloride and 2-bromomethylpyridine in a molar ratio of 1:1:1.1:0.8, and its molecular formula is as follows:

[0029]

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

[0031] ① Add 1 mol of naphthalene anhydride and 1 mol of n-dodecyl alcohol into a four-neck flask, heat to 75°C, stir at 300 rpm, and react for 0.5 h, then add 2972.7 g of n-heptane, react for 5 h, then cool down To room temperature, stirred for 15min to obtain dodecyl naphthalene half ester solution;

[0032] ②Add 1.1 mol of 2-(dimethylamino)methane chloride hydrochloride to the dodecyl naphthalene anhydride half ester solution, react while stirring, the stirring rate is 400rpm, the reacti...

Embodiment 2

[0035] Example 2: Clay Stabilizer C 2 and its preparation method

[0036] (1) Clay Stabilizer C 2 The composition, components and molecular formula are as follows:

[0037] Clay Stabilizer C 2 It is obtained by reacting naphthalene anhydride, n-dodecyl alcohol, 2-(dimethylamino)chloromethane hydrochloride and 2-bromomethylpyridine according to the molar ratio of 1:1.1:1.2:1.5. Its molecular formula is as follows:

[0038]

[0039] (2) Clay Stabilizer C 2 The synthesis method is as follows:

[0040] ① Add 1 mol of naphthalene anhydride and 1.1 mol of n-dodecyl alcohol into a four-neck flask, heat to 78°C, stir at 400rpm, and react for 0.6h, then add 3256.3g of n-heptane, react for 6h, then Cool to room temperature, stir for 18min to obtain dodecyl naphthalene half ester solution;

[0041] ②Add 1.2 mol of 2-(dimethylamino)methane chloride hydrochloride to the dodecyl naphthalene anhydride half-ester solution, react while stirring, the stirring rate is 500rpm, the reaction...

Embodiment 3

[0044] Example 3: Clay Stabilizer C 3 and its preparation method

[0045] (1) Clay Stabilizer C 3 The composition, components and molecular formula are as follows:

[0046] Clay Stabilizer C 3 It is obtained by reacting naphthalene anhydride, n-dodecyl alcohol, 2-(dimethylamino)chloromethane hydrochloride and 2-bromomethylpyridine according to the molar ratio of 1:1.3:1.3:1.2. Its molecular formula is as follows:

[0047]

[0048] (2) Clay Stabilizer C 3 The synthesis method is as follows:

[0049] ① Add 1 mol of naphthalene anhydride and 1.3 mol of n-dodecyl alcohol into a four-neck flask, heat to 80°C, stir at 330 rpm, and react for 0.8 h, then add 3954.5 g of n-heptane for 7 h, then Cool to room temperature, stir for 21min to obtain dodecyl naphthalene half ester solution;

[0050] ②Add 1.3 mol of 2-(dimethylamino)methane chloride hydrochloride to the dodecyl naphthalene anhydride half-ester solution, react while stirring, the stirring rate is 420rpm, the reaction ...

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Abstract

The invention belongs to the technical field of oilfield development, and in particular relates to a cation-type anti-swelling clay stabilizer containing N-heterocyclic quaternary ammonium salt and a synthesis method thereof. The clay stabilizer is generated by performing reaction between anhydride naphthalene and dodecanol to generate dodecyl anhydride naphthalene half-ester, performing solution polymerization reaction with 2-(dimethylamino)chloromethane hydrochloride to generate an intermediate, and finally performing reaction with 2-bromomethylpyridine, wherein the molar ratio of the anhydride naphthalene to the dodecanol to the 2-(dimethylamino)chloromethane hydrochloride to the 2-bromomethylpyridine is 1:1-1.6:1.1-1.5:0.8-1.7, preferably 1:1.1:1.2:1.5. The clay stabilizer is characterized by wide source of raw materials, simple synthesis process, small usage and high reservoir adaptability. The clay stabilizer is good in temperature resistance and salt resistance, the temperature of 220 DEG C can be resisted, the degree of mineralization of 220000mg / L can be resisted, and the compatibility is excellent. The clay stabilizer can be strongly adhered to the surface of clay, is not prone to decomposition, and is long in duration and high in anti-swelling rate which exceeds 98 percent.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an N-containing heterocyclic quaternary ammonium salt cationic 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 Applications(China)
IPC IPC(8): C07D213/36C09K8/035
CPCC07D213/36C09K8/035C09K2208/12
Inventor 张松亭王志坚陈晓春杨胜利白昕荣雁杜春安马天态孙立柱陶建强杨再新
Owner CHINA PETROLEUM & CHEM CORP
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