A silicone defoaming agent composition for foam drainage gas recovery and a preparation method thereof

Abstract

The application relates to the technical field of defoaming agents and discloses a kind of silicone defoaming agent composition for foam drainage gas production and a preparation method thereof, the silicone defoaming agent composition for foam drainage gas production, comprising the following ingredients: silicon paste, emulsifier, synergist, thickening agent, deionized water; the silicon paste comprises the following three components: silicon paste I, silicon paste II and silicon paste III. It is found in the process of experiment that the silicon paste prepared by silicon hydrogen addition reaction has obvious defoaming and foam suppressing effects when applied in the silicone defoaming agent for gas production. The three silicon pastes with different viscosities have both defoaming and foam suppressing properties, so that the defoaming and foam suppressing properties of the product are considered. Through the introduction of the synergist, excellent bubble breaking performance is achieved, and the precipitation compatibility problem of the product is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of defoaming agents, in particular to a kind of organic silicon defoaming agent composition for foam drainage gas recovery and preparation method thereof. BACKGROUND

[0002] With the continuous development of gas field exploitation, foam drainage gas recovery process (foam drainage) is one of the main means of drainage gas recovery. It is to inject foaming agent from the wellhead of the gas well with insufficient liquid carrying capacity to the bottom of the well, and to contact with the gas-filled liquid at the bottom of the well by the stirring action of natural gas flow, so as to produce a large amount of relatively stable water-containing foam, so that the liquid at the bottom of the well is easily carried to the ground by gas flow. An important link at the end of foam drainage process is to eliminate foam and ensure gas-water separation. If the foam is not eliminated completely, it will cause many adverse effects.

[0003] Organic silicon defoaming agent is widely used in foam drainage gas recovery process due to its low surface tension, good chemical and thermal stability, excellent defoaming and suppressing performance. Patent CN113350834A proposes three different viscosity silicon oils as active substances of defoaming agent, which improves the defoaming time of defoaming agent, but the activity of the active substance decays easily, which makes the suppressing performance very poor and cannot meet the requirements of field use, limiting the popularization and application in foam drainage gas recovery. SUMMARY

[0004] The purpose of the present application is to solve the problems of poor foam suppression and poor compatibility in the prior art, and to provide a kind of organic silicon defoaming agent composition for foam drainage gas recovery and preparation method thereof.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A kind of organic silicon defoaming agent composition for foam drainage gas recovery, comprising the following ingredients by weight percentage: silicon paste 7-30%, emulsifier 5-20%, synergist 1-30%, thickening agent 0.5-5%, deionized water 50-70%.

[0007] Preferably, the silicon paste comprises three components: silicon paste I, silicon paste II and silicon paste III; the weight fraction of the above three components is: silicon paste I 1-10 parts, silicon paste II 5-20 parts, silicon paste III 1-10 parts.

[0008] Preferably, the weight fraction of the three components in the silicon paste is: silicon paste I 3-7 parts, silicon paste II 5-15 parts, silicon paste III 3-8 parts.

[0009] Preferably, the preparation method of silicon paste I and silicon paste II is: gas phase method silicon dioxide, methyl MQ and different viscosity dimethyl silicone oil are reacted at 120℃, 2500rpm for 2h.

[0010] Preferably, the preparation method of the silicone paste III comprises the following steps: adding a carrier on the basis of the vinyl silicone oil, hydrogen-containing silicone oil, white carbon black, MQ and Karstedt catalyst to synthesize the cross-linked silicone hydrogen addition paste III.

[0011] Preferably, the weight percentage of each component in the preparation of the silicone paste III is: carrier 50-70%, vinyl silicone oil 5-25%, hydrogen-containing silicone oil 5-20%, MQ 3-5%, white carbon black 3-5%, and Karstedt catalyst 3-15 ppm.

[0012] Preferably, the carrier comprises one or more of a mixture of silicone fluid, organic solvent and organic oil.

[0013] Preferably, the synergist comprises one of alkyl glycoside, polyether; and the thickening agent comprises one of xanthan gum, hamsen glue and polyacrylate.

[0014] The preparation method of the above-mentioned silicone defoaming agent composition for foam drainage gas recovery comprises the following steps:

[0015] Step 1: mix the emulsifier and the silicone paste at a stirring speed of 1000-3500 rpm for 30-60 min;

[0016] Step 2: heat to 60-90 DEG C, stir for 30 min, add the synergist, and stir and mix for 30 min;

[0017] Step 3: add deionized water and the thickening agent, and adjust the pH value to 6.5-7.0, and keep warm for 30-60 min;

[0018] Step 4: emulsify the mixture obtained in steps 1-3 to obtain an emulsion;

[0019] Step 5: according to the solid content requirement of the emulsion, adjust the amount of the thickening agent and water, adjust the pH value to 7.0, continue to stir to fully mix, and then cool to room temperature to obtain the silicone defoaming agent composition for foam drainage gas recovery.

[0020] The beneficial effects of the present application are:

[0021] It is found in the experimental process of the present application that the silicone paste prepared by the silicone hydrogen addition reaction has obvious defoaming and foam suppressing effects when applied in the silicone defoaming agent for gas recovery, and the defoaming and foam suppressing performance of the product is considered by selecting three different viscosity silicone pastes; through the introduction of the synergist, excellent defoaming performance is achieved while the precipitation compatibility problem of the product is reduced. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments.

[0023] Embodiment 1

[0024] The silicone paste I was prepared by reacting fumed silica, methyl MQ and dimethyl silicone fluid with a viscosity of 500 mPa.s at 25℃ at 120℃ for 2h at a rotation speed of 2500rpm;

[0025] The silicone paste II was prepared by reacting fumed silica, methyl MQ and dimethyl silicone fluid with a viscosity of 1000 mPa.s at 25℃ at 120℃ for 2h at a rotation speed of 2500rpm;

[0026] The raw materials were weighed according to the following weight percentages: silicone fluid 66%, vinyl silicone oil 15%, hydrogen-containing silicone oil 10%, MQ 4.5%, white carbon black 4.5%, Karstedt catalyst 3ppm, and the above raw materials were mixed to synthesize the cross-linked silicone paste III through hydrosilylation reaction;

[0027] The ingredients were weighed according to the following weight percentages: silicone paste I 3%, silicone paste II 5%, silicone paste III 3%, emulsifier 20%, synergist 18.5%, thickening agent 0.5%, and deionized water 50%;

[0028] The emulsifier and the silicone paste were mixed at a rotation speed of 1000rpm for 30min; the temperature was increased to 60℃ and stirred for 30min; the synergist was added and mixed for 30min; the deionized water and the thickening agent were added, and the pH value was adjusted to 6.5 and kept for 30min; the mixture obtained in step 1-3 was emulsified to obtain an emulsion; according to the solid content requirement of the emulsion, the amount of the thickening agent and the water was adjusted, the pH value was adjusted to 7.0, and the mixture was continuously stirred to be fully mixed and then cooled to room temperature to obtain the silicone defoaming agent composition for foam drainage gas recovery.

[0029] Embodiment 2

[0030] The silicone paste I was prepared by reacting fumed silica, methyl MQ and dimethyl silicone fluid with a viscosity of 2000 mPa.s at 25℃ at 120℃ for 2h at a rotation speed of 2500rpm;

[0031] The silicone paste II was prepared by reacting fumed silica, methyl MQ and dimethyl silicone fluid with a viscosity of 3000 mPa.s at 25℃ at 120℃ for 2h at a rotation speed of 2500rpm;

[0032] The raw materials are weighed according to the following weight percentage: silicone fluid 65%, vinyl silicone oil 15%, hydrogen-containing silicone oil 10%, MQ 5%, white carbon black 5%, Karstedt catalyst 15 ppm, and the above raw materials are mixed to synthesize cross-linked silicone paste III through a silicon-hydrogen addition reaction.

[0033] The components are weighed according to the following weight percentage: silicone paste I 7%, silicone paste II 15%, silicone paste III 8%, emulsifier 5%, synergist 10%, thickening agent 5%, and deionized water 50%.

[0034] The emulsifier, silicone paste, and deionized water are mixed at a stirring speed of 3500 rpm for 60 min; the temperature is raised to 90°C and stirring is performed for 30 min; the synergist is added and stirring is performed for 30 min; the deionized water and thickening agent are added, and the pH value is adjusted to 7.0 and the mixture is incubated for 60 min; the mixture obtained in step 1-3 is emulsified to obtain an emulsion; the amount of thickening agent and water is adjusted according to the solid content requirement of the emulsion, the pH value is adjusted to 7.0, and the mixture is stirred and cooled to room temperature to obtain the silicone defoaming agent composition for foam drainage gas recovery.

[0035] Example 3

[0036] Compared with Example 1, the difference lies in that the raw materials are weighed according to the following weight percentage: silicone fluid 62%, vinyl silicone oil 25%, hydrogen-containing silicone oil 5%, MQ 4%, white carbon black 4%, and Karstedt catalyst 15 ppm; the above raw materials are mixed to synthesize cross-linked silicone paste III through a silicon-hydrogen addition reaction, and the viscosity of silicone paste III is 1.2 million.

[0037] Example 4

[0038] Compared with Example 1, the difference lies in that the raw materials are weighed according to the following weight percentage: silicone fluid 63%, vinyl silicone oil 20%, hydrogen-containing silicone oil 9%, MQ 4%, white carbon black 4%, and Karstedt catalyst 10 ppm; the above raw materials are mixed to synthesize cross-linked silicone paste III through a silicon-hydrogen addition reaction, and the viscosity of silicone paste III is 3.3 million.

[0039] Example 5

[0040] Compared with Example 1, the difference lies in that the raw materials are weighed according to the following weight percentage: silicone fluid 59.5%, vinyl silicone oil 19%, hydrogen-containing silicone oil 13.5%, MQ 4%, white carbon black 4%, and Karstedt catalyst 7 ppm; the above raw materials are mixed to synthesize cross-linked silicone paste III through a silicon-hydrogen addition reaction, and the viscosity of silicone paste III is 5.5 million.

[0041] Example 6

[0042] The difference compared with Example 1 is that the raw materials are weighed according to the following weight percentages: silicone fluid 56%, vinyl silicone oil 19%, hydrogen-containing silicone oil 17%, MQ 4%, white carbon black 4%, Karstedt catalyst 7 ppm, the above raw materials are mixed, and cross-linked silicone paste III is synthesized by hydrosilylation reaction. The viscosity of silicone paste III is 880,000.

[0043] Example 7

[0044] The difference compared with Example 1 is that the raw materials are weighed according to the following weight percentages: silicone fluid 67%, vinyl silicone oil 7%, hydrogen-containing silicone oil 20%, MQ 3%, white carbon black 3%, Karstedt catalyst 3 ppm, the above raw materials are mixed, and cross-linked silicone paste III is synthesized by hydrosilylation reaction. The viscosity of silicone paste III is 160,000.

[0045] Comparative Example 1

[0046] The difference compared with Example 1 is that three different viscosity dimethyl silicone oils are used as active substances to prepare silicone emulsions. The viscosity of silicone oil I (25°C) is 1000 mPa.s, the viscosity of silicone oil II (25°C) is 3000 mPa.s, and the viscosity of silicone oil III (25°C) is 10000 mPa.s. The following weight percentages are weighed: silicone oil I 3%, silicone oil II 5%, silicone oil III 3%, emulsifier 20%, synergist 18.5%, thickening agent 0.5%, deionized water 50%;

[0047] Comparative Example 2

[0048] The difference compared with Example 2 is that only two conventional silicone pastes are contained, and no cross-linked silicone paste III synthesized by hydrosilylation reaction is contained.

[0049] Silicone paste I is prepared by reacting fumed silica, methyl MQ, and dimethyl silicone oil with a viscosity of 2000 mPa.s at 25°C at 120°C, 2500 rpm for 2h;

[0050] Silicone paste II is prepared by reacting fumed silica, methyl MQ, and dimethyl silicone oil with a viscosity of 3000 mPa.s at 25°C at 120°C, 2500 rpm for 2h;

[0051] The following weight percentages are weighed: silicone paste I 7%, silicone paste II 15%, emulsifier 5%, synergist 10%, thickening agent 5%, deionized water 58%;

[0052] The defoaming and foam suppressing tests were carried out on the obtained foam drainage gas recovery organic silicone defoamer compositions of the examples and the comparative examples in cocamide propyl betaine foaming agent CAB35 respectively, the experiment process was carried out according to the Technical Specification for Defoamer for Foam Drainage Gas Recovery: Q / SY17001-2016, the defoamer defoaming time and foam suppressing time were counted, and the results are shown in Table 1.

[0053] Table 1 Performance determination of defoamer

[0054]

[0055] It can be seen from the data in Table 1 that the defoamer provided by the application has the advantages of excellent defoaming performance and longer foam suppressing time in the foaming system CAB35 compared with the comparative examples, and meets the requirements of the Technical Specification for Defoamer for Foam Drainage Gas Recovery: Q / SY17001-2016 on defoaming time and foam suppressing time.

[0056] It is found in the experiment that the crosslinked silicone paste prepared by the silicon-hydrogen addition reaction has obvious defoaming and foam suppressing effect when applied in the foam drainage gas recovery organic silicone defoamer, three different viscosity silicone pastes are selected, and the defoaming and foam suppressing performances are combined, so that the defoaming and foam suppressing performances of the product are considered; by introducing the synergist, the excellent defoaming performance is achieved while the precipitation and compatibility problems of the product are reduced.

[0057] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A silicone defoamer composition for foam drainage gas recovery, characterized by, The composition comprises the following ingredients by weight percentage: silicone paste 7-30%, emulsifier 5-20%, synergist 1-30%, thickening agent 0.5-5%, deionized water 50-70%; The silicone paste comprises three components: silicone paste I, silicone paste II and silicone paste III; the weight percentage of the three components is: silicone paste I 1-10 parts, silicone paste II 5-20 parts, silicone paste III 1-10 parts; The weight percentage of the three components in the silicone paste is: silicone paste I 3-7 parts, silicone paste II 5-15 parts, silicone paste III 3-8 parts; The preparation method of the silicone paste I and silicone paste II is: reacting gas phase silicon dioxide, methyl MQ and dimethyl silicone oil with different viscosities at 120°C and a rotation speed of 2500 rpm for 2 hours; The preparation method of the silicone paste III comprises the following steps: adding a carrier on the basis of Karstedt catalyst to synthesize cross-linked silicone hydrogen addition paste III from vinyl silicone oil, hydrogen-containing silicone oil, white carbon black and MQ; The weight percentage of each component in the preparation of the silicone paste III is: carrier 50-70%, vinyl silicone oil 5-25%, hydrogen-containing silicone oil 5-20%, MQ 3-5%, white carbon black 3-5%, Karstedt catalyst 3-15 ppm; The carrier comprises one or more of organic silicon fluid, organic solvent and organic oil; The synergist comprises alkyl glycoside and polyether; the thickening agent comprises one of xanthan gum, hamsen glue and polyacrylate.

2. The method for producing a silicone defoaming agent composition for foam drainage gas recovery according to claim 1, characterized by, The method comprises the following steps: Step 1: mixing the emulsifier and the silicone paste at a rotation speed of 1000-3500 rpm for 30-60 min; Step 2: heating to 60-90°C and stirring for 30 min, then adding the synergist and stirring for 30 min; Step 3: adding deionized water and the thickening agent and adjusting the pH value to 6.5-7.0, and keeping warm for 30-60 min; Step 4: emulsifying the mixture obtained in steps 1-3 to obtain an emulsion; Step 5: adjusting the amount of the thickening agent and water according to the solid content requirement of the emulsion, adjusting the pH value to 7.0, continuing to stir to fully mix, and then cooling to room temperature to obtain the organic silicone defoaming agent composition for foam drainage gas recovery.

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