CN113967372A - Broad-spectrum efficient defoaming agent for offshore oil field and preparation method thereof - Google Patents
Broad-spectrum efficient defoaming agent for offshore oil field and preparation method thereof Download PDFInfo
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- B01D19/02—Foam dispersion or prevention
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Abstract
The invention discloses a broad-spectrum efficient defoaming agent for offshore oil fields, which is prepared from 8-10 wt% of defoaming main agent, 0.5-1 wt% of defoaming auxiliary agent, 1-2 wt% of synergist and the balance of dispersant by mass; the defoaming main agent is prepared by taking mixed polydimethylsiloxane, epoxy polydimethylsiloxane, polydimethylsiloxane alcohol and hydrogen-containing MQ silicon resin with different molecular weights as raw materials and taking an organic tin compound as a catalyst to react in an organic solvent. The defoaming agent can be spread and diffused on the surface of foam more quickly, the interface strength of the foam is reduced, the defoaming effect is further enhanced, the defoaming agent is widely suitable for oil-gas separation treatment of crude oil with different oil properties in offshore oil fields, and the defoaming agent is a broad-spectrum and efficient crude oil defoaming agent product.
Description
Technical Field
The invention belongs to the field of chemical defoaming, relates to a crude oil defoaming agent, and particularly relates to a broad-spectrum efficient defoaming agent for offshore oil fields and a preparation method thereof.
Background
When crude oil is produced from an oil well, associated gas originally dissolved in the crude oil is gradually separated from the crude oil due to a decrease in pressure and a change in temperature, forming a large amount of bubbles.
If the gas in the crude oil cannot be removed rapidly and thoroughly, the oil-gas mixture containing a large amount of gas enters a production separation device, which easily causes the separation device to be incapable of operating normally, so that the whole production flow fluctuates. Even more, the safety accident of tank-break can occur, and the safety of the equipment and the whole platform is threatened.
In a land oilfield, due to the fact that the production space is large, the defoaming effect of crude oil can be enhanced through a series of means such as adding related degassing equipment and prolonging the treatment time, and the purpose of final gas-liquid separation is achieved. However, in offshore oil fields, objective factors such as short crude oil treatment process, high automation degree, narrow space and the like exist, so that the crude oil defoaming agent has important significance for stable production.
At present, defoaming agents applied to offshore oil fields are divided into four major products, namely solvent type organic silicon defoaming agents, solvent type polyether modified silicon oil defoaming agents and emulsion type defoaming agents. The solvent-type organic silicon defoamer taking polydimethylsiloxane as a main agent has the advantages of low surface tension, heat resistance, low temperature resistance, physiological inertia and the like, has good defoaming effect in the oil-gas separation process of offshore oilfields, and is superior to solvent-type polyether defoamer and emulsion defoamer products; however, the product has certain defects, and the permeability and diffusivity are poor when the product is used for heavy oil fields, so that the quick defoaming effect cannot be achieved. The solvent type polyether modified silicon oil defoaming agent has a good defoaming effect on heavy oil fields, but has a poor defoaming effect on most light crude oil fields.
At present, whether the defoaming agent for oil-gas separation of crude oil has no related national and industrial detection standards or not is verified mainly by field experiments and pilot tests according to whether the defoaming agent meets the requirements of oil fields or not. Aiming at different oil field produced fluids, which type of defoaming agent product is added can be determined by repeated evaluation experiments and field pilot tests. However, this condition cannot be satisfied in some offshore platforms, especially in the production of newly built oil fields. In order to ensure the safe production of offshore oil fields, a broad-spectrum high-efficiency crude oil defoamer needs to be researched.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a broad-spectrum high-efficiency defoaming agent for offshore oil fields.
Another object of the present invention is to provide a method for preparing the above-mentioned defoaming agent.
The technical purpose of the invention is realized by the following technical scheme.
A broad-spectrum high-efficiency defoaming agent for offshore oil fields is prepared from 8-10 wt% of a defoaming main agent, 0.5-1 wt% of a defoaming auxiliary agent, 1-2 wt% of a synergist and the balance of a dispersant; the defoaming main agent is prepared by taking mixed polydimethylsiloxane with different molecular weights, epoxy polydimethylsiloxane, polydimethylsiloxane alcohol and hydrogen-containing MQ silicon resin as raw materials and taking an organic tin compound as a catalyst to react in an organic solvent; wherein:
the total adding amount of all the substances in the preparation process of the main defoaming agent is 100 parts by mass, wherein: 40-50 parts by mass of mixed polydimethylsiloxane with different molecular weights, 5-8 parts by mass of epoxy polydimethylsiloxane, 5-10 parts by mass of dimethiconol, 0.5-2 parts by mass of hydrogen-containing MQ silicon resin, 0.01-0.05 part by mass of organic tin compound and the balance of organic solvent;
the mixed polydimethylsiloxane with different molecular weights consists of polydimethylsiloxane 1#, polydimethylsiloxane 2# and polydimethylsiloxane 3# with different molecular weights and molecular structures shown in a formula I:
wherein the mass fraction of the polydimethylsiloxane 1# is 40-50 wt%, and the molecular weight is 5500-6000 g/mol; the mass fraction of the polydimethylsiloxane 2# is 30-40 wt%, and the molecular weight is 26000-28000 g/mol; the mass fraction of the polydimethylsiloxane 3# is 10-20 wt%, and the molecular weight is 120000-160000 g/mol;
the molecular structure of the epoxy polydimethylsiloxane is shown as a formula II:
wherein m is 40-120, and the molecular weight of the epoxy polydimethylsiloxane is 3000-10000 g/mol;
the molecular structure of the dimethiconol is shown as a formula III:
wherein m is 100-200, and the molecular weight of the dimethiconol is 7000-15000 g/mol;
the hydrogen-containing MQ silicon resin is a compound which is formed by taking Si-O bonds as a framework, and the molecular structure of the hydrogen-containing MQ silicon resin is shown as a formula IV:
wherein, [ (CH)3)2HSiO1/2]a[(CH3)3SiO1/2]bIs of M structure, [ SiO ]4/2]cThe molecular weight of the hydrogen-containing MQ silicon resin is 5000-12000g/mol, the molar ratio of M/Q is 0.9-1.2, and the hydrogen content is 0.15-0.25 percent in order to form a Q structure。
In the defoaming agent, the defoaming auxiliary agent is one or more of benzyl alcohol, n-octanol, isooctanol, octadecanol and dodecanol.
In the defoaming agent, the synergist is one or more of ethylene glycol tristearate, tributyl phosphate, ethylene glycol monostearate and diethylene glycol monolaurate.
In the defoaming agent, the dispersing agent is one or more of aromatic solvent oil, kerosene and 120# solvent oil.
In the defoaming agent, the organic tin compound is one of dibutyltin bis (dodecyl sulfur), stannous octoate, dibutyltin diacetate and dibutyltin dilaurate.
In the defoaming agent, the organic solvent is one or two of toluene and xylene.
Preferably, the broad-spectrum efficient defoaming agent for the offshore oil field is prepared from 9-10 wt% of defoaming main agent, 0.8-1 wt% of defoaming auxiliary agent, 1-2 wt% of synergist and the balance of dispersant.
Preferably, the addition amount of each substance in the preparation process of the main defoaming agent is 100 parts by mass in total, wherein: 48-50 parts by mass of mixed polydimethylsiloxane with different molecular weights, 6.5-7 parts by mass of epoxy polydimethylsiloxane, 8.5-9.2 parts by mass of dimethiconol, 0.8-1 part by mass of hydrogen-containing MQ silicon resin, 0.03-0.04 part by mass of organic tin compound and the balance of organic solvent.
Preferably, the mass fraction of the polydimethylsiloxane 1# is 48-50 wt%, and the molecular weight is 5800-6000 g/mol; the mass fraction of the polydimethylsiloxane 2# is 35-40 wt%, and the molecular weight is 26500-27500 g/mol; the mass fraction of the polydimethylsiloxane 3# is 10-17 wt%, and the molecular weight is 120000-125000 g/mol.
Preferably, the molecular weight of the epoxy polydimethylsiloxane is 3000-3500 g/mol.
Preferably, the molecular weight of the dimethiconol is 10000-14000 g/mol.
Preferably, the molecular weight of the hydrogen-containing MQ silicon resin is 8000-11000g/mol, the molar ratio of M/Q is 1.0-1.2, and the hydrogen content is 0.18-0.25%.
The preparation method of the defoaming agent comprises the following steps:
step 1: mixing mixed polydimethylsiloxane, epoxy polydimethylsiloxane, dimethiconol, hydrogen-containing MQ silicon resin and an organic solvent, stirring under the protection of nitrogen, heating to 80-100 ℃, adding an organic tin compound, controlling the temperature to be 90-110 ℃, reacting for 1-2 hours under normal pressure, and cooling to normal temperature after the reaction is finished to obtain a defoaming main agent;
step 2: mixing the main defoaming agent prepared in the step 1 and the synergist in proportion, heating to 60-80 ℃, stirring for reaction for 0.5-1h, and cooling to normal temperature after the reaction is finished;
and step 3: and (3) sequentially adding a defoaming auxiliary agent and a dispersing agent into the reaction product obtained in the step (2), and uniformly mixing to obtain the defoaming agent.
Compared with the prior art, the invention takes the mixed polydimethylsiloxane as the raw material, and retains the advantage of low surface tension of the organic silicon defoaming agent; meanwhile, a crosslinking modification mode is adopted to prepare an active organic silicon compound with a three-dimensional structure formed by taking Si-O bonds as a framework, and the active organic silicon compound has low surface tension and wetting capacity and good spreadability and diffusivity in crude oil; in addition, the added defoaming auxiliary agent and synergist can improve the bridging capacity of the prepared defoaming agent, reduce the foam interface strength and achieve the purpose of quick defoaming. In conclusion, the defoaming agent can be spread and diffused on the surface of foam more quickly, the foam interface strength is reduced, the defoaming effect is further enhanced, the defoaming agent is widely applicable to oil-gas separation treatment of crude oil with different oil properties in offshore oil fields, and the defoaming agent is a broad-spectrum and efficient crude oil defoaming agent product.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The information on the reagents used in the examples of the present invention is as follows:
the manufacturers of mixed polydimethylsiloxane (polydimethylsiloxane No. 1, polydimethylsiloxane No. 2 and polydimethylsiloxane No. 3), epoxy polydimethylsiloxane, polydimethylsiloxane alcohol and hydrogen-containing MQ silicone resin are the blue star chemical industry; the organotin compound supplier is Nantong Haokai chemical products Co., Ltd; the suppliers of benzyl alcohol, n-octanol, iso-octanol, octadecanol and dodecanol are Tianjin Enbanner technology Co., Ltd; ethylene glycol tristearate, tributyl phosphate, ethylene glycol monostearate, diethylene glycol monolaurate were supplied as maya reagents by the manufacturer; aromatic solvent oil, kerosene and No. 120 solvent oil are industrial qualified products.
Example 1
The invention relates to a broad-spectrum efficient defoaming agent for offshore oilfields, which is prepared from 8 wt% of defoaming main agent, 0.5 wt% of defoaming auxiliary agent, 1 wt% of synergist and 90.5 wt% of dispersant; the defoaming main agent is prepared by taking 40 parts by mass of mixed polydimethylsiloxane with different molecular weights, 5 parts by mass of epoxy polydimethylsiloxane, 10 parts by mass of polydimethylsiloxane alcohol and 0.5 part by mass of hydrogen-containing MQ silicon resin as raw materials and taking 0.01 part by mass of organic tin compound as a catalyst to react in 44.49 parts by mass of organic solvent.
The mixed polydimethylsiloxane with different molecular weights consists of 40 wt% of polydimethylsiloxane No. 1, 40 wt% of polydimethylsiloxane No. 2 and 20 wt% of polydimethylsiloxane No. 3.
The preparation method of the broad-spectrum high-efficiency defoaming agent for the offshore oil field comprises the following steps:
step 1: firstly, 16g of polydimethylsiloxane No. 1 (the number average molecular weight is 5500g/mol), 16g of polydimethylsiloxane No. 2 (the number average molecular weight is 28000g/mol), 8g of polydimethylsiloxane No. 3 (the number average molecular weight is 160000g/mol), 5g of epoxy polydimethylsiloxane (the number average molecular weight is 4500g/mol), 10g of dimethiconol (the number average molecular weight is 7000g/mol), 0.5g of hydrogen-containing MQ silicone resin (the number average molecular weight is 5000g/mol, the molar ratio of M to Q is 0.9, the hydrogen content is 0.15%) and 44.49g of xylene are pumped into a reaction kettle and mixed, nitrogen is blown into the reaction kettle, stirring and heating to 100 ℃ under the protection of nitrogen, then adding 0.01g of dibutyltin bis (dodecyl sulfur) catalyst, controlling the temperature at 110 ℃, continuing to react for 1.5h under normal pressure, and cooling to normal temperature after the reaction is finished to obtain a main defoaming agent;
step 2: pumping the defoaming main agent (80g) prepared in the step 1 and a synergist (5g ethylene glycol monostearate and 5g diethylene glycol monolaurate) into a reaction kettle, mixing, heating to 60 ℃, stirring for reaction for 1h, and cooling to normal temperature after the reaction is finished;
and step 3: and (3) sequentially adding a defoaming auxiliary agent (2.5g of isooctanol and 2.5g of benzyl alcohol) and a dispersing agent (905g of aromatic solvent oil) into the reaction product obtained in the step (2), and uniformly mixing to obtain the defoaming agent.
Example 2
The invention relates to a broad-spectrum efficient defoaming agent for offshore oil fields, which is prepared from 10 wt% of defoaming main agent, 1 wt% of defoaming auxiliary agent, 1.2 wt% of synergist and 87.8 wt% of dispersant; the defoaming main agent is prepared by taking 50 parts by mass of mixed polydimethylsiloxane with different molecular weights, 8 parts by mass of epoxy polydimethylsiloxane, 5 parts by mass of polydimethylsiloxane alcohol and 2 parts by mass of hydrogen-containing MQ silicon resin as raw materials and taking 0.05 part by mass of organic tin compound as a catalyst to react in 34.95 parts by mass of organic solvent.
The mixed polydimethylsiloxane with different molecular weights consists of 50 wt% of polydimethylsiloxane No. 1, 30 wt% of polydimethylsiloxane No. 2 and 20 wt% of polydimethylsiloxane No. 3.
The preparation method of the broad-spectrum high-efficiency defoaming agent for the offshore oil field comprises the following steps:
step 1: 25g of polydimethylsiloxane No. 1 (number average molecular weight of 5730g/mol), 15g of polydimethylsiloxane No. 2 (number average molecular weight of 26000g/mol), 10g of polydimethylsiloxane No. 3 (number average molecular weight of 120000g/mol), 8g of epoxy polydimethylsiloxane (number average molecular weight of 10000g/mol), 5g of dimethiconol (number average molecular weight of 15000g/mol), 2g of hydrogen-containing MQ silicone resin (number average molecular weight of 12000g/mol, M/Q molar ratio of 1.0, hydrogen content of 0.2%) and 34.95g of toluene are pumped into a reaction kettle and mixed, nitrogen is blown into the reaction kettle, stirring and heating to 80 ℃ under the protection of nitrogen, then adding 0.05g of stannous octoate catalyst, controlling the temperature at 100 ℃, continuing to react for 1h under normal pressure, and cooling to normal temperature after the reaction is finished to obtain a defoaming main agent;
step 2: pumping 100g of the defoaming main agent prepared in the step 1 and a synergist (5g of ethylene glycol tristearate and 7g of tributyl phosphate) into a reaction kettle, mixing, heating to 70 ℃, stirring for reaction for 0.5h, and cooling to normal temperature after the reaction is finished;
and step 3: and (3) sequentially adding a defoaming auxiliary agent (5g of n-octanol and 5g of octadecanol) and a dispersing agent (878g of kerosene) into the reaction product obtained in the step (2), and uniformly mixing to obtain the defoaming agent.
Example 3
The invention relates to a broad-spectrum efficient defoaming agent for offshore oilfields, which is prepared from 9 wt% of defoaming main agent, 0.8 wt% of defoaming auxiliary agent, 2 wt% of synergist and 88.2 wt% of dispersant; the defoaming main agent is prepared by reacting 48 parts by mass of mixed polydimethylsiloxane with different molecular weights, 6.5 parts by mass of epoxy polydimethylsiloxane, 8.5 parts by mass of polydimethylsiloxane alcohol and 1 part by mass of hydrogen-containing MQ silicon resin serving as raw materials in 35.97 parts by mass of an organic solvent by taking 0.03 part by mass of an organic tin compound as a catalyst.
The mixed polydimethylsiloxane with different molecular weights consists of 50 wt% of polydimethylsiloxane No. 1, 40 wt% of polydimethylsiloxane No. 2 and 10 wt% of polydimethylsiloxane No. 3.
The preparation method of the broad-spectrum high-efficiency defoaming agent for the offshore oil field comprises the following steps:
step 1: firstly, 24g of polydimethylsiloxane No. 1 (the number average molecular weight is 6000g/mol), 19.2g of polydimethylsiloxane No. 2 (the number average molecular weight is 26500g/mol), 4.8g of polydimethylsiloxane No. 3 (the number average molecular weight is 125000g/mol), 6.5g of epoxy polydimethylsiloxane (the number average molecular weight is 3000g/mol), 8.5g of dimethiconol (the number average molecular weight is 10000g/mol), 1g of hydrogen-containing MQ silicone resin (the number average molecular weight is 8000g/mol, the molar ratio of M/Q is 1.2, the hydrogen content is 0.25 percent), 24.97g of toluene and 11g of xylene are pumped into a reaction kettle and mixed, nitrogen gas is blown into the reaction kettle, stirring and heating to 90 ℃ under the protection of nitrogen, then adding 0.03g of dibutyltin diacetate catalyst, controlling the temperature at 100 ℃, continuing to react for 2 hours under normal pressure, and cooling to normal temperature after the reaction is finished to obtain a defoaming main agent;
step 2: pumping 90g of the defoaming main agent prepared in the step 1 and a synergist (5g of diethylene glycol monolaurate and 15g of tributyl phosphate) into a reaction kettle, mixing, heating to 75 ℃, stirring for reaction for 0.5h, and cooling to normal temperature after the reaction is finished;
and step 3: and (3) adding a defoaming auxiliary agent (3g of benzyl alcohol and 5g of dodecanol) and a dispersing agent (882g of No. 120 solvent oil) into the reaction product obtained in the step (2) in sequence, and uniformly mixing to obtain the defoaming agent.
Example 4
The invention relates to a broad-spectrum efficient defoaming agent for offshore oil fields, which is prepared from 10 wt% of defoaming main agent, 1 wt% of defoaming auxiliary agent, 1 wt% of synergist and 88 wt% of dispersing agent; the defoaming main agent is prepared by taking 50 parts by mass of mixed polydimethylsiloxane with different molecular weights, 7 parts by mass of epoxy polydimethylsiloxane, 9.2 parts by mass of polydimethylsiloxane alcohol and 0.8 part by mass of hydrogen-containing MQ silicon resin as raw materials and taking 0.04 part by mass of organic tin compound as a catalyst to react in 32.96 parts by mass of organic solvent.
The mixed polydimethylsiloxane with different molecular weights consists of 48 wt% of polydimethylsiloxane No. 1, 35 wt% of polydimethylsiloxane No. 2 and 17 wt% of polydimethylsiloxane No. 3.
The preparation method of the broad-spectrum high-efficiency defoaming agent for the offshore oil field comprises the following steps:
step 1: firstly, 24g of polydimethylsiloxane No. 1 (the number average molecular weight is 5800g/mol), 17.5g of polydimethylsiloxane No. 2 (the number average molecular weight is 27500g/mol), 8.5g of polydimethylsiloxane No. 3 (the number average molecular weight is 120000g/mol), 7g of epoxy polydimethylsiloxane (the number average molecular weight is 3500g/mol), 9.2g of dimethiconol (the number average molecular weight is 14000g/mol), 0.8g of hydrogen-containing MQ silicone resin (the number average molecular weight is 11000g/mol, the molar ratio of M/Q is 1.0, the hydrogen content is 0.18 percent) and 32.96g of dimethylbenzene are pumped into a reaction kettle and mixed, nitrogen is blown into the reaction kettle, stirring and heating to 80 ℃ under the protection of nitrogen, then adding 0.04g of dibutyltin dilaurate catalyst, controlling the temperature at 90 ℃, continuing to react for 2 hours under normal pressure, and cooling to normal temperature after the reaction is finished to obtain a defoaming main agent;
step 2: pumping the defoaming main agent (100g) prepared in the step 1 and the synergist (10g ethylene glycol tristearate) into a reaction kettle, mixing, heating to 80 ℃, stirring for reaction for 0.5h, and cooling to normal temperature after the reaction is finished;
and step 3: and (3) sequentially adding a defoaming auxiliary agent (3g of benzyl alcohol, 3g of n-octanol, 2g of isooctanol and 2g of octadecanol) and a dispersing agent (180g of 120# solvent oil, 300g of aromatic solvent oil and 400g of kerosene) into the reaction product obtained in the step (2), and uniformly mixing to obtain the defoaming agent.
Example 5
The broad-spectrum efficient defoaming agent for the offshore oilfield is prepared from 9.5 wt% of a defoaming main agent, 0.8 wt% of a defoaming auxiliary agent, 1.2 wt% of a synergist and 88.5 wt% of a dispersing agent; the defoaming main agent is prepared by taking 40 parts by mass of mixed polydimethylsiloxane with different molecular weights, 8 parts by mass of epoxy polydimethylsiloxane, 5 parts by mass of polydimethylsiloxane alcohol and 1 part by mass of hydrogen-containing MQ silicon resin as raw materials and taking 0.03 part by mass of organic tin compound as a catalyst to react in 45.97 parts by mass of organic solvent.
The mixed polydimethylsiloxane with different molecular weights consists of 45 wt% of polydimethylsiloxane No. 1, 36 wt% of polydimethylsiloxane No. 2 and 19 wt% of polydimethylsiloxane No. 3.
The preparation method of the broad-spectrum high-efficiency defoaming agent for the offshore oil field comprises the following steps:
step 1: firstly, 18g of polydimethylsiloxane No. 1 (the number average molecular weight is 5900g/mol), 14.4g of polydimethylsiloxane No. 2 (the number average molecular weight is 26300g/mol), 7.6g of polydimethylsiloxane No. 3 (the number average molecular weight is 138000g/mol), 8g of epoxy polydimethylsiloxane (the number average molecular weight is 9000g/mol), 5g of dimethiconol (the number average molecular weight is 14200g/mol), 1g of hydrogen-containing MQ silicone resin (the number average molecular weight is 11000g/mol, the molar ratio of M/Q is 1.1, the hydrogen content is 0.2 percent) and 45.97g of toluene are pumped into a reaction kettle and mixed, nitrogen is blown into the reaction kettle, stirring and heating to 95 ℃ under the protection of nitrogen, then adding 0.03g of stannous octoate catalyst, controlling the temperature at 115 ℃, continuing to react for 1.5h under normal pressure, and cooling to normal temperature after the reaction is finished to obtain a main defoaming agent;
step 2: pumping the defoaming main agent (95g) prepared in the step 1 and a synergist (4g of ethylene glycol tristearate, 4g of tributyl phosphate and 4g of ethylene glycol monostearate) into a reaction kettle, mixing, heating to 65 ℃, stirring for reaction for 0.5h, and cooling to normal temperature after the reaction is finished;
and step 3: and (3) sequentially adding a defoaming auxiliary agent (4g of n-octanol, 2g of isooctanol and 2g of octadecanol) and a dispersing agent (485g of aromatic hydrocarbon solvent oil and 400g of kerosene) into the reaction product obtained in the step (2), and uniformly mixing to obtain the defoaming agent.
The performance of the defoaming agent prepared in the examples 1 to 5 of the invention was tested by the on-site crude oil degassing experiments of different types of offshore oil fields, and the change of the crude oil volume with time after adding different defoaming agents was observed, and the test process was as follows:
a) taking a platform comprehensive manifold oil sample, detecting the temperature, and preheating a measuring cylinder to the corresponding temperature;
b) 500mL of fresh oil sample with bubbles is collected from the platform comprehensive manifold, a certain amount of crude oil defoaming agent is added, a stopwatch is started, and the heights of the oil sample at 1min, 5min, 10min and 15min are observed and recorded;
c) recording the time required for complete elimination of the foam, wherein the shorter the complete defoaming time, the better the defoaming agent effect is proved;
d) the above test was repeated, different crude oil antifoam agents were added, and the effect of the agent was recorded and confirmed.
The specific test results are as follows.
Field test 1:
a test platform: bohai sea certain heavy oil field
Experiment raw materials: oilfield field crude oil
Evaluation method: in situ crude oil degassing experiment
The concentration of the medicament: 150mg/L
The test results are shown in table 1:
TABLE 1 field screening data sheet (test temperature 63 deg.C)
As can be seen from the data in Table 1, the defoaming agent disclosed by the invention has a good degassing effect on heavy oil fields, is superior to a common solvent-based organic silicon defoaming agent, has a defoaming effect equivalent to that of a solvent-based polyether modified silicone oil defoaming agent currently used on a platform, and meets the degassing requirement of heavy oil fields.
Field test 2:
a test platform: bohai sea certain medium crude oil field
Experiment raw materials: oilfield field crude oil
Evaluation method: in situ crude oil degassing experiment
The concentration of the medicament: 35mg/L
The test results are shown in table 2:
table 2 field screening data table (test temperature 55 deg.c)
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(continuation upper page)
As can be seen from the data in Table 2, the defoaming agent of the invention has good degassing effect for medium crude oil fields, is superior to the common solvent-based organosilicon defoaming agent and the emulsion-type defoaming agent currently used by the platform, and meets the degassing requirement of the medium crude oil fields.
Field test 3:
a test platform: bohai sea certain light crude oil field
Experiment raw materials: oilfield field crude oil
Evaluation method: in situ crude oil degassing experiment
The concentration of the medicament: 12mg/L
The test results are shown in table 3:
table 3 field screening data table (detection temperature 65 deg.c)
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As can be seen from the data in Table 3, the defoaming agent of the invention has good degassing effect for light crude oil fields, is superior to the solvent type organosilicon defoaming agent currently used by platforms, and meets the degassing requirement of light crude oil fields.
By detecting a plurality of different offshore oil fields in the Bohai sea, the defoaming agent disclosed by the invention is widely applicable to crude oil defoaming of different produced fluids of the offshore oil fields, and is a broad-spectrum and efficient crude oil defoaming agent.
Although the methods and techniques of the present invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and/or rearrangements of the methods and techniques described herein may be made without departing from the spirit and scope of the invention. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be within the spirit, scope and content of the invention.
Claims (10)
1. The broad-spectrum efficient defoaming agent for the offshore oil field is characterized by comprising the following components in parts by weight: the defoaming agent is prepared from 8-10 wt% of defoaming main agent, 0.5-1 wt% of defoaming auxiliary agent, 1-2 wt% of synergist and the balance of dispersant; the defoaming main agent is prepared by taking mixed polydimethylsiloxane with different molecular weights, epoxy polydimethylsiloxane, polydimethylsiloxane alcohol and hydrogen-containing MQ silicon resin as raw materials and taking an organic tin compound as a catalyst to react in an organic solvent; wherein:
the total adding amount of all the substances in the preparation process of the main defoaming agent is 100 parts by mass, wherein: 40-50 parts by mass of mixed polydimethylsiloxane with different molecular weights, 5-8 parts by mass of epoxy polydimethylsiloxane, 5-10 parts by mass of dimethiconol, 0.5-2 parts by mass of hydrogen-containing MQ silicon resin, 0.01-0.05 part by mass of organic tin compound and the balance of organic solvent;
the mixed polydimethylsiloxane with different molecular weights consists of polydimethylsiloxane 1#, polydimethylsiloxane 2# and polydimethylsiloxane 3# with different molecular weights and molecular structures shown in a formula I:
wherein the mass fraction of the polydimethylsiloxane 1# is 40-50 wt%, and the molecular weight is 5500-6000 g/mol; the mass fraction of the polydimethylsiloxane 2# is 30-40 wt%, and the molecular weight is 26000-28000 g/mol; the mass fraction of the polydimethylsiloxane 3# is 10-20 wt%, and the molecular weight is 120000-160000 g/mol;
the molecular structure of the epoxy polydimethylsiloxane is shown as a formula II:
wherein m is 40-120, and the molecular weight of the epoxy polydimethylsiloxane is 3000-10000 g/mol;
the molecular structure of the dimethiconol is shown as a formula III:
wherein m is 100-200, and the molecular weight of the dimethiconol is 7000-15000 g/mol;
the hydrogen-containing MQ silicon resin is a compound which is formed by taking Si-O bonds as a framework, and the molecular structure of the hydrogen-containing MQ silicon resin is shown as a formula IV:
wherein, [ (CH)3)2HSiO1/2]a[(CH3)3SiO1/2]bIs of M structure, [ SiO ]4/2]cThe hydrogen-containing MQ silicon resin has the molecular weight of 5000-12000g/mol, the molar ratio of M/Q is 0.9-1.2, and the hydrogen content is 0.15-0.25 percent.
2. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the defoaming auxiliary agent is one or more of benzyl alcohol, n-octanol, isooctanol, octadecanol and dodecanol; the synergist is one or more of ethylene glycol tristearate, tributyl phosphate, ethylene glycol monostearate and diethylene glycol monolaurate; the dispersing agent is one or more of aromatic solvent naphtha, kerosene and 120# solvent naphtha.
3. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the organic tin compound is one of dibutyltin dilaurate, stannous octoate, dibutyltin diacetate and dibutyltin dilaurate, and the organic solvent is one or two of methylbenzene and dimethylbenzene.
4. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the broad-spectrum efficient defoaming agent for the offshore oil field is prepared from 9-10 wt% of a defoaming main agent, 0.8-1 wt% of a defoaming auxiliary agent, 1-2 wt% of a synergist and the balance of a dispersing agent.
5. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the total adding amount of all the substances in the preparation process of the main defoaming agent is 100 parts by mass, wherein: 48-50 parts by mass of mixed polydimethylsiloxane with different molecular weights, 6.5-7 parts by mass of epoxy polydimethylsiloxane, 8.5-9.2 parts by mass of dimethiconol, 0.8-1 part by mass of hydrogen-containing MQ silicon resin, 0.03-0.04 part by mass of organic tin compound and the balance of organic solvent.
6. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the mass fraction of the polydimethylsiloxane 1# is 48-50 wt%, and the molecular weight is 5800-6000 g/mol; the mass fraction of the polydimethylsiloxane 2# is 35-40 wt%, and the molecular weight is 26500-27500 g/mol; the mass fraction of the polydimethylsiloxane 3# is 10-17 wt%, and the molecular weight is 120000-125000 g/mol.
7. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the molecular weight of the epoxy polydimethylsiloxane is 3000-3500 g/mol.
8. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the molecular weight of the dimethiconol is 10000-14000 g/mol.
9. The wide-spectrum high-efficiency antifoaming agent for offshore oilfield according to claim 1, wherein: the molecular weight of the hydrogen-containing MQ silicon resin is 8000-11000g/mol, the molar ratio of M/Q is 1.0-1.2, and the hydrogen content is 0.18-0.25%.
10. The preparation method of the broad-spectrum high-efficiency antifoaming agent for offshore oilfield according to any one of claims 1 to 9, is characterized by comprising the following steps:
step 1: mixing mixed polydimethylsiloxane, epoxy polydimethylsiloxane, dimethiconol, hydrogen-containing MQ silicon resin and an organic solvent, stirring under the protection of nitrogen, heating to 80-100 ℃, adding an organic tin compound, controlling the temperature to be 90-110 ℃, reacting for 1-2 hours under normal pressure, and cooling to normal temperature after the reaction is finished to obtain a defoaming main agent;
step 2: mixing the main defoaming agent prepared in the step 1 and the synergist in proportion, heating to 60-80 ℃, stirring for reaction for 0.5-1h, and cooling to normal temperature after the reaction is finished;
and step 3: and (3) sequentially adding a defoaming auxiliary agent and a dispersing agent into the reaction product obtained in the step (2), and uniformly mixing to obtain the defoaming agent.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2012174405A1 (en) * | 2011-06-17 | 2012-12-20 | Kemira Oyj | Powder defoaming compositions and methods of reducing gas entrainment in fluids |
| CN105498300A (en) * | 2015-11-24 | 2016-04-20 | 宜兴市丰烨化学有限公司 | A preparing method of an ethylene oxide-epoxypropane composite antifoaming agent |
| CN106215465A (en) * | 2016-08-12 | 2016-12-14 | 中国海洋石油总公司 | A kind of Oil-gas Separation defoamer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012174405A1 (en) * | 2011-06-17 | 2012-12-20 | Kemira Oyj | Powder defoaming compositions and methods of reducing gas entrainment in fluids |
| CN105498300A (en) * | 2015-11-24 | 2016-04-20 | 宜兴市丰烨化学有限公司 | A preparing method of an ethylene oxide-epoxypropane composite antifoaming agent |
| CN106215465A (en) * | 2016-08-12 | 2016-12-14 | 中国海洋石油总公司 | A kind of Oil-gas Separation defoamer |
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