Long-acting oil well anti-swelling clay stabilizing agent and synthetic method thereof

A technology of clay stabilizer and synthesis method, which is applied in chemical instruments and methods, drilling compositions, preparation of organic compounds, etc., can solve the problem of reducing formation permeability, poor temperature and salt resistance of clay stabilizers, and limited application range To achieve the effects of good compatibility, strong reservoir adaptability and wide source of raw materials

Inactive Publication Date: 2018-02-16
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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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 temperature and salt resistance of the clay stabilizer is poor, which limits its application range

Method used

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  • Long-acting oil well anti-swelling clay stabilizing agent and synthetic method thereof
  • Long-acting oil well anti-swelling clay stabilizing agent and synthetic method thereof
  • Long-acting oil well anti-swelling clay stabilizing agent and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Clay Stabilizer B 1 and its preparation method

[0028] (1) Clay Stabilizer B 1 The composition, components and molecular formula are as follows:

[0029] Clay Stabilizer B 1 The molar ratio of 2,3-naphthalene dicarboxylic anhydride, n-dodecyl alcohol, 2-(dimethylamino)chloromethane hydrochloride and 1-bromomethylnaphthalene is 1: 0.8: 1.2: 1.1, and its molecular formula is as follows:

[0030]

[0031] (2) Clay Stabilizer B 1 The synthesis method is as follows:

[0032] ① Add 1mol of 2,3-naphthalene dicarboxylic anhydride and 0.8mol of n-dodecyl alcohol into a four-necked flask, and stir while heating. The heating temperature is 75°C, the stirring rate is 350rpm, and the reaction time is 0.8h. g n-heptane, the reaction time is 6h, then cooled to room temperature, stirred for 10min, to obtain dodecyl-2,3-naphthalene dicarboxylic anhydride half ester solution;

[0033] 2. Add 1.2mol of 2-(dimethylamino)methane chloride hydrochloride in the above-menti...

Embodiment 2

[0036] Example 2: Clay Stabilizer B 2 and its preparation method

[0037] (1) Clay Stabilizer B 2 The composition, components and molecular formula are as follows:

[0038] Clay Stabilizer B2 The molar ratio of 2,3-naphthalene dicarboxylic anhydride, n-dodecyl alcohol, 2-(dimethylamino)chloromethane hydrochloride and 1-bromomethylnaphthalene is 1: 1.0: 1.4: 1.2, and its molecular formula is as follows:

[0039]

[0040] (2) Clay Stabilizer B 2 The synthesis method is as follows:

[0041] ① Add 1mol of 2,3-naphthalene dicarboxylic anhydride and 1.0mol of n-dodecyl alcohol into a four-neck flask, and stir while heating. The heating temperature is 78°C, the stirring rate is 380rpm, and the reaction time is 1.0h. g n-heptane, the reaction time is 5h, then cooled to room temperature, stirred for 15min, to obtain dodecyl-2,3-naphthalene dicarboxylic anhydride half ester solution;

[0042] 2. Add 1.4mol of 2-(dimethylamino)methane chloride hydrochloride in the above-mentioned...

Embodiment 3

[0045] Example 3: Clay Stabilizer B 3 and its preparation method

[0046] (1) Clay Stabilizer B 3 The composition, components and molecular formula are as follows:

[0047] Clay Stabilizer B 3 The molar ratio of 2,3-naphthalene dicarboxylic anhydride, n-dodecyl alcohol, 2-(dimethylamino)chloromethane hydrochloride and 1-bromomethylnaphthalene is 1: 1.1: 1.3: 1.4, and its molecular formula is as follows:

[0048]

[0049] (2) Clay Stabilizer B 3 The synthesis method is as follows:

[0050] ①Add 1mol of 2,3-naphthalene dicarboxylic anhydride and 1.1mol of n-dodecyl alcohol into a four-neck flask, and stir while heating. The heating temperature is 85°C, the stirring rate is 300rpm, and the reaction time is 1.2h. , 3345.8g n-heptane, the reaction time is 4h, then cooled to room temperature, stirred for 20min, to obtain dodecyl-2,3-naphthalene dicarboxylic anhydride half ester solution;

[0051] 2. Add 1.3mol of 2-(dimethylamino)methane chloride hydrochloride in the above-...

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Abstract

The invention belongs to the technical field of oil field development, and particularly relates to a long-acting oil well anti-swelling clay stabilizing agent and a synthetic method thereof. 2,3-naphthalic anhydride and n-dodecyl alcohol react to generate dodecyl ortho naphthalene dimethylbenzene anhydride half ester, the dodecyl ortho naphthalene dimethylbenzene anhydride half ester and 2-(dimethylamino) chloromethane hydrochloride generate an intermediate through solution polymerization reaction, the intermediate and 1-bromomethyl-naphthalene react to generate the clay stabilizing agent, themolar ratio of the 2,3-naphthalic anhydride, the n-dodecyl alcohol, the 2-(dimethylamino) chloromethane hydrochloride to the 1-bromomethyl-naphthalene is 1:(0.8-1.4):(1.2-1.6):(1.1-1.8), and preferably, the molar ratio is 1:1:1.4:1.2. The clay stabilizing agent has the advantages of wide raw material source, simple synthetic process, less consumption and high oil deposit adaptability. The clay stabilizing agent is good in temperature and salt resistance, can resist the temperature of 250 DEG C and resist the mineralization degree of 220000mg / L and has good compatibility. The clay stabilizingagent can be powerfully adsorbed onto the surface of clay, is not easily decomposed and is long in validity period and high in anti-swelling rate, and the anti-swelling rate reaches 98% or more.

Description

technical field [0001] The invention belongs to the technical field of oilfield exploitation, and in particular relates to a long-acting anti-swelling clay stabilizer for oil wells 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 of silicon-oxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/60C07C213/08C07C219/14
CPCC09K8/035C07C67/08C07C213/00C07C213/08C07C219/14C09K8/607C09K2208/12C07C69/76
Inventor 郝晓燕
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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