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pH-responsive foam drainage agent, preparation method and application

A foam drainage agent and reaction technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor high temperature resistance, inability to solve production reduction or even stop spraying, etc.

Active Publication Date: 2019-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that the existing foam drainage agent has poor high temperature resistance in an acidic environment, and cannot solve the problem of production reduction or even stop spraying caused by liquid accumulation in high-temperature ultra-deep gas wells. A foam drainage agent pH Value-responsive foam drainage agent, used in high-temperature deep wells, has very good temperature resistance under acidic conditions, and has strong liquid-carrying, foaming and foam-stabilizing properties

Method used

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  • pH-responsive foam drainage agent, preparation method and application
  • pH-responsive foam drainage agent, preparation method and application
  • pH-responsive foam drainage agent, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Preparation of foaming agent F01

[0046] a. Add 127.6 grams (0.55 moles) of pentaethylenehexamine and 1.4 grams (0.025 moles) of potassium hydroxide solid in the reaction flask equipped with mechanical stirring, thermometer, dropping funnel and atmospheric distillation device, and slowly drop them under stirring Add 148 grams (0.5 moles) of methyl oleate, react at a reaction temperature of 120 to 160°C for 6 hours, and collect the methanol generated by the reaction at the same time to obtain the desired amide compound C 17 h 33 CO(NHCH 2 CH 2 ) 5 NH 2 , yield 93.8%.

[0047] b. After removing the water in the three-necked flask device equipped with a reflux condenser, a dropping funnel, and a thermometer, add 11.4 grams (0.3 moles) of lithium aluminum hydride and 90 milliliters of dry dioxane, stir, disperse and mix, and then - Add 49.6 grams (0.1 moles) of C 17 h 33 CO(NHCH 2 CH 2 ) 5 NH 2 40wt% dioxane solution, after the dropwise addition, the temper...

Embodiment 2

[0054] With [Example 1], the difference is that when measuring the performance of F01, the pH is adjusted to 7 and 4 with hydrochloric acid to simulate neutral and acidic gas environments, and the results are shown in Table 2.

Embodiment 3

[0056] (1) Preparation of foaming agent F02:

[0057] a. Add 67.0 grams (0.65 moles) of diethylenetriamine and 6.9 grams (0.05 moles) of potassium carbonate solid in the reaction flask equipped with mechanical stirring, thermometer, dropping funnel and atmospheric distillation device, slowly drop them under stirring 142.0 grams (0.5 moles) of ethyl hexadecanoate, reacted for 4 hours at a reaction temperature of 120 to 160 ° C, and collected the ethanol generated by the reaction at the same time to obtain the desired amide compound C 15 h 31 CO(NHCH2 CH 2 ) 2 NH 2 , yield 94.5%.

[0058] b. After removing the water in the three-neck flask equipped with a reflux condenser, dropping funnel, and thermometer, add LiAlH(OEt) 3 51 grams (0.3 moles) and 120 milliliters of anhydrous diethyl ether, stir and mix, add 34.1 grams (0.1 moles) of C 15 h 31 CO(NHCH 2 CH 2 ) 2 NH 2 50wt% anhydrous ether solution, after the dropwise addition, the temperature was slowly raised to abou...

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Abstract

The invention relates to a pH-responsive foam drainage agent, a preparation method and application. The pH-responsive foam drainage agent, the preparation method and the application mainly solve the problems that existing foam drainage agents are poor in high-temperature and high-salt resistance under acidic environments containing H2S and CO2 and cannot avoid output reduction and even blowout stop caused by accumulated liquid of high-temperature high-salt ultra-deep gas wells. The pH-responsive foam drainage agent comprises a surfactant shown in the formula (1); R1 is one of C4-C32 alkyl or substituted alkyl, and R2, R3 and R4 are independently at least one of H, C1-C5 alkyl or substituted alkyl carboxylate, C1-C5 alkyl or substituted alkyl sulfonate, C1-C5 alkyl or substituted alkyl phosphate and C1-C5 alkyl or substituted alkyl sulfate, and are not H simultaneously; m is equal to 1-10. By means of the technical scheme, the problem is well solved, and the pH-responsive foam drainageagent can be applied to drainage gas recovery from acidic high-temperature high-salt ultra-deep gas wells. Please see the specification for the formula (1).

Description

technical field [0001] The invention relates to a foam drainage agent, its preparation method and application, in particular to a pH value responsive foam drainage agent, its preparation method and application. Background technique [0002] With the intensification of gas field exploitation, water production from gas fields has become a key issue restricting the normal production of gas wells. Foam drainage gas recovery is a drainage gas recovery technology developed rapidly at home and abroad in recent years. It has the advantages of simple equipment, convenient construction, low cost, wide range of applicable well depths, and does not affect the normal production of gas wells. Foam drainage is to inject foam drainage agent into the well through the tubing or tubing annulus, and generate foam with certain stability under the agitation of the air flow. The liquid phase deposited by slippage in the pipe turns into foam, which changes the relative density of the fluid in the ...

Claims

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Application Information

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IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 沈之芹何秀娟裘鋆吴春芳
Owner CHINA PETROLEUM & CHEM CORP
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