CN111004348B - High-temperature-resistant gas-moisture reversal agent capable of improving recovery ratio of condensate gas reservoir and preparation method and application thereof - Google Patents
High-temperature-resistant gas-moisture reversal agent capable of improving recovery ratio of condensate gas reservoir and preparation method and application thereof Download PDFInfo
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- CN111004348B CN111004348B CN201911310714.1A CN201911310714A CN111004348B CN 111004348 B CN111004348 B CN 111004348B CN 201911310714 A CN201911310714 A CN 201911310714A CN 111004348 B CN111004348 B CN 111004348B
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- C08F2/16—Aqueous medium
- C08F2/22—Emulsion polymerisation
- C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
- C08F2/26—Emulsion polymerisation with the aid of emulsifying agents anionic
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- C09K8/588—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids characterised by the use of specific polymers
Abstract
The invention relates to a high-temperature-resistant gas-moisture reversal agent for improving the recovery ratio of a condensate gas reservoir and a preparation method and application thereof. The preparation method of the high-temperature-resistant gas-moisture reversal agent comprises the following steps: in the presence of persulfate initiator, adding composite emulsifier and acrylate into water solution, heating to reaction temperature, dropwise adding perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, acrylate and perfluorohexyl ethyl methacrylate monomers for polymerization, then cooling, adjusting the pH of the emulsion to be neutral, and filtering to obtain a product; the obtained product can be directly prepared into 0.5-2% solution, and the solution and the well bore working fluid enter a condensate gas reservoir together for changing the surface wettability of the reservoir near the well bore of the condensate gas reservoir so as to improve the recovery ratio of the condensate gas reservoir.
Description
Technical Field
The invention relates to a high-temperature-resistant gas-moisture reversal agent for improving the recovery ratio of a condensate gas reservoir and a preparation method and application thereof, belonging to the technical field of petrochemical engineering for improving the production increase of gas reservoir exploitation.
Technical Field
The shortage of oil and gas resources in China seriously depends on imports for a long time, and along with the continuous change of energy patterns, the method has strategic significance on the research and development of unconventional oil and gas resources in recent years. The condensate gas reservoir is an important component of unconventional oil and gas resources and is the key for guaranteeing energy safety and relieving supply pressure. When the condensate gas is hidden in production and the pressure near the well bore is lower than the dew point pressure, liquid phase can be condensed near the well bore, so that the permeability near the bottom of the well is reduced, and the productivity of the gas well is seriously reduced. Researchers have suggested removing condensate from the vicinity of the wellbore by injecting carbon dioxide and propane into the vicinity of the wellbore, but this approach only temporarily alleviates the problem of condensate build-up and does not fundamentally solve it. Therefore, if the wettability of the near-wellbore region can be changed to gas-wet or neutral gas-wet, the wetting reversal can be realized, the seepage capability of the fluid in the near-wellbore region can be enhanced, and the productivity of the condensate gas reservoir can be improved. For the first time, the concept of gas-moisture and reversing the wettability of condensate reservoirs from liquid-moisture to neutral gas-moisture improves the flow of fluids in the vicinity of the wellbore, thereby increasing the productivity of gas wells, see Li K, firezabadi a. geological modeling of critical polymeric formation and relative particulate in gas/polymeric systems. spe Journal 2000, 5: 138-. Further samples of gas-wet rock were prepared and demonstrated that when the wettability of the rock was reversed to gas-wet, the relative permeability of the liquid phase in the core increased, the flow of reservoir fluids in its interior was greatly improved, and the literature for significantly improving the productivity of condensate reservoirs is described in Tang GQ, first zabadi a.relative permeability modification in gas-liquid systems through gas-well characterization.spe 81195, nuclear Technical Conference and inhibition, Dallas, Texas, 1-4 October. However, this enhancement is very limited, mainly because it changes the wettability of the near-wellbore region from liquid-wet to gas-wet or neutral-gas-wet only, does not achieve the effect of strong gas-wet, and has poor temperature resistance. In addition, the existing new products or materials related to air-wet reversal are few in types, and most of the new products or materials are screened or compounded from the existing chemical agents, so that the air-wet reversal effect is not ideal.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a high-temperature-resistant gas-moisture reversal agent which can be applied to improving the recovery ratio of a condensate gas reservoir.
The technical problem to be solved by the invention is as follows: a fluoropolymer is provided which can reverse the wettability of a region near a condensate gas reservoir wellbore from liquid-wet to strong gas-wet, which can significantly improve the recovery efficiency of the condensate gas reservoir, and which has high temperature resistance.
The invention also provides a preparation method and application of the polymer gas-moisture reversal agent.
The technical scheme of the invention is as follows:
a high temperature resistant gas-moisture reversal agent for improving the recovery ratio of a condensate gas reservoir is a polymer with a structure shown in a formula I:
in the formula I, R1Is hydrogen or methyl; r2Is methoxy or ethoxy. The mass average molecular weight is 20000 to 22000.
According to the invention, the preparation method of the high-temperature-resistant gas-moisture reversal agent for improving the recovery ratio of the condensate gas reservoir comprises the following steps:
in the presence of persulfate initiator, adding composite emulsifier and acrylate into water solution, heating to reaction temperature, dropwise adding perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, acrylate and perfluorohexyl ethyl methacrylate monomers, carrying out polymerization reaction, cooling after the reaction is finished, adjusting the pH of the emulsion to be neutral, and filtering to obtain a product;
the composite emulsifier is a mixture of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether (OP-10), the acrylate is selected from methyl acrylate, ethyl acrylate, 2-methyl methacrylate and 2-ethyl methacrylate, and the reaction temperature is 83-87 ℃.
According to the invention, in a more detailed scheme, the preparation method of the high-temperature-resistant gas-moisture reversal agent for improving the recovery ratio of the condensate gas reservoir comprises the following steps:
(1) adding deionized water, a composite emulsifier and acrylic ester into a reaction kettle provided with a stirrer and a temperature measuring and refluxing device, and uniformly stirring; stirring at high speed for emulsification under the protection of nitrogen, and then adding a persulfate aqueous solution;
(2) heating, when the temperature in the reaction kettle is raised to 70-80 ℃ and kept constant for 30-40 minutes, adding the persulfate aqueous solution again, and after the temperature is kept constant, dropwise adding a monomer mixture of perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, acrylate and perfluorohexyl ethyl methacrylate through a constant-pressure dropping funnel;
(3) after the monomer mixture is dripped, heating to 82-89 ℃, and reacting for 2.5-4 hours; then cooling and adjusting the pH value of the obtained emulsion to be neutral by using an alkaline substance;
(4) and (4) filtering the emulsion obtained in the step (3) to obtain a product.
According to the present invention, the preferred composite emulsifier described in the above step (1) is a mixture of sodium lauryl sulfate and polyoxyethylene octylphenol ether (OP-10).
According to the invention, the persulfate is potassium persulfate or sodium persulfate. Preparing 10-20 wt% aqueous solution of persulfate. In the present invention, the persulfate initiator is added in two portions, which is done to make the polymerization more complete.
The reaction raw materials and the reagents of the invention are analytically pure and have the purity higher than that of the reaction raw materials. According to the invention, the reactions are preferably carried out in glass reaction vessels.
According to the present invention, it is preferred that the reaction of step (1) comprises one or more of the following conditions:
a 1: the quantity ratio of the sodium dodecyl sulfate to the polyoxyethylene octyl phenol ether (OP-10) in the composite emulsifier is 1: 0.8-1.8; further preferably 1:1 to 1.4.
a 2: the mass ratio of the deionized water to the composite emulsifier to the acrylate is 50 (1-2) to (5-15), and the mass ratio of the deionized water to the composite emulsifier to the acrylate is preferably 50:1: 10.
a 3: sequentially adding the ionized water, the composite emulsifier and the acrylic ester into the reaction kettle, and stirring for 20-30 minutes.
a 4: the high-speed stirring emulsification time is 30-40 minutes.
a 5: the high-speed stirring emulsification temperature is 30-35 ℃.
a 6: the consumption of the persulfate aqueous solution is 0.5-1.0% by mass, calculated by taking the total mass of the reaction monomers as a base number, and further preferably, the consumption of the persulfate aqueous solution is 0.5-0.8% by mass.
According to the present invention, it is preferred that the reaction of step (2) comprises one or more of the following conditions:
b 1: the heating is carried out by oil bath.
b 2: adding the persulfate aqueous solution again to make the mass fraction of the persulfate aqueous solution be 1.4-2.0% (calculated by using the total mass of the reaction monomers as a base number); further preferably, the aqueous persulfate solution is added in an amount of 1.4 to 1.6% by mass.
b 3: and after adding the persulfate aqueous solution again, controlling the constant temperature time to be 10-15 minutes.
b 4: the mixing mass ratio of perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, acrylate and perfluorohexylethyl methacrylate is 2:3 (1-1.5):5, and more preferably, the mixing ratio is 2:3 (1-1.2): 5.
b 5: the perfluorooctyl ethyl acrylate, the dodecafluoroheptyl methacrylate, the acrylate and the perfluorohexyl ethyl methacrylate are mixed in sequence, namely, the perfluorooctyl ethyl acrylate and the dodecafluoroheptyl methacrylate are added firstly, the acrylate is added, and finally the perfluorohexyl ethyl methacrylate is added, and the whole mixing process is carried out under the stirring condition, so that the formation of precipitates is avoided.
According to the present invention, it is preferred that the reaction of step (3) comprises one or more of the following conditions:
c 1: the reaction temperature is controlled at 84-86 ℃; more preferably, the reaction temperature is 85 ℃.
c 2: the reaction time is controlled to be 3-3.5 hours. More preferably, the reaction time is 3 hours.
c 3: cooling to 40-45 deg.c.
c 4: the alkaline substance is sodium carbonate or sodium bicarbonate.
According to the present invention, it is preferable that, in the step (4), the filtration is performed under a vacuum degree of 0.08 to 0.09MPa at a temperature of 25 to 30 ℃.
The polymer shown in the formula I is applied as a high-temperature-resistant gas-moisture reversal agent of a condensate gas reservoir, and is used for changing the surface wettability of a reservoir near a condensate gas reservoir shaft so as to improve the recovery ratio of the condensate gas reservoir. The application method comprises the following steps:
the high-temperature-resistant gas-moisture reversal agent and deionized water are prepared into a solution according to a required proportion, and the solution and a wellbore working fluid enter a condensate gas reservoir stratum together. Further preferably, the gas-wet reversal agent of the invention is added with deionized water to prepare a solution with the mass fraction of 0.5-2% for use.
The invention has the following excellent effects:
1. the gas-moisture reversing agent provided by the invention has a perfluorinated chain structure, and can well reverse the wettability of the surface of a reservoir near a condensate gas reservoir shaft from liquid wettability to gas wettability, so that the relative permeability of a liquid phase in a rock core is increased, the flowing condition of a fluid in the rock core is greatly improved, and the productivity is increased by 2-3 times.
2. The gas-moisture reversal agent provided by the invention has high temperature resistance, the temperature resistance reaches 203 ℃, and the gas-moisture reversal agent can be suitable for the development of unconventional oil gas in a deep high-temperature reservoir (see figure 9).
3. The gas-moisture reversal agent provided by the invention is easy to prepare, the operation method is simple, almost no by-product is generated, the reaction raw materials are added into the reaction kettle, the reaction kettle can be used for carrying out the reaction, and the product has good miscibility with water, so that the gas-moisture reversal agent is beneficial to field popularization and application.
Drawings
FIG. 1 shows that the spreading state and the contact angle of deionized water and n-hexadecane on the surface of condensate gas reservoir rock which is not treated by a gas-moisture reversal agent are both 0; in the figure, a is the contact angle of deionized water on the surface of the rock; b is the contact angle of n-hexadecane on the rock surface, the same as below.
Fig. 2 shows that the spreading state and the contact angle of deionized water and n-hexadecane on the surface of the condensate gas reservoir rock treated by the gas-wet reversal agent prepared in the embodiment 1 and prepared into a gas-wet reversal agent solution with a mass fraction of 1.2% are respectively 121 degrees and 109 degrees;
fig. 3 shows that the spreading state and the contact angle of deionized water and n-hexadecane on the surface of the condensate gas reservoir rock treated by the gas-wet reversal agent prepared in the embodiment 2 and prepared into a gas-wet reversal agent solution with a mass fraction of 1.2% are 124 ° and 108 °;
fig. 4 shows that the spreading state and the contact angle of deionized water and n-hexadecane on the surface of the condensate gas reservoir rock treated by the gas-wet reversal agent prepared in the embodiment 3 and prepared into a gas-wet reversal agent solution with a mass fraction of 1.2% are 127 ° and 95 °;
fig. 5 shows that the spreading state and the contact angle of deionized water and n-hexadecane on the surface of the condensate gas reservoir rock treated by the gas-wet reversal agent prepared in the embodiment 4 and prepared into a gas-wet reversal agent solution with a mass fraction of 1.2% are 129 ° and 91 ° respectively;
fig. 6 shows that the spreading state and the contact angle of deionized water and n-hexadecane on the surface of the condensate gas reservoir rock treated by the gas-wet reversal agent prepared in the embodiment 5 and prepared in the gas-wet reversal agent solution with the mass fraction of 1.2% are 123 ° and 105 °;
fig. 7 shows that the spreading state and the contact angle of deionized water and n-hexadecane on the surface of the condensate gas reservoir rock treated by the gas-wet reversal agent prepared in this example 6 and prepared in the gas-wet reversal agent solution with the mass fraction of 1.2% are 122 ° and 96 °;
FIG. 8 an IR spectrum of a gas-wet inverter compound prepared in example 1; the abscissa is wavelength and the ordinate is transmittance.
FIG. 9 thermogravimetric analysis of the gas-moisture inverter prepared in example 1.
Detailed Description
The present invention will be described in more detail below with reference to examples, which will help to further understand the present invention, but are not limited thereto.
The raw materials used in the examples are all commercially available materials. In the examples, "%" is a mass percentage unless otherwise specified. In the examples, all the persulfates were used in the form of an aqueous solution of persulfate at a concentration of 15% by weight.
Example 1
A preparation method of a high-temperature-resistant gas-moisture reversal agent for improving the recovery ratio of a condensate gas reservoir comprises the following steps:
(1) 100g of deionized water, 2g of a complex emulsifier (sodium dodecyl sulfate and polyoxyethylene octylphenol ether in a mass ratio of 1:1) and 20g of methyl acrylate were placed in a reaction vessel equipped with a stirrer, a temperature measuring device and a reflux unit, and stirred for 25 minutes. Emulsifying at 30 deg.C under nitrogen protection with high speed stirring for 40 min, and adding 0.53g sodium persulfate aqueous solution.
(2) Oil bath heating was started and held for 35 minutes as the temperature in the autoclave rose and reached 75 ℃. And adding 1.12g of sodium persulfate aqueous solution again, reacting for 15 minutes at constant temperature, and then dropwise adding 55g of a monomer mixture of perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, methyl acrylate and perfluorohexylethyl methacrylate in a mass ratio of 2:3:1: 5.
The perfluorooctyl ethyl acrylate, the dodecafluoroheptyl methacrylate, the acrylate and the perfluorohexyl ethyl methacrylate are mixed in sequence, namely, the perfluorooctyl ethyl acrylate and the dodecafluoroheptyl methacrylate are added firstly, the acrylate is added, and finally the perfluorohexyl ethyl methacrylate is added, and the whole mixing process is carried out under the stirring condition.
(3) After the monomer mixture is dripped, the mixture reacts for 3 hours at 85 ℃, then the temperature is reduced to 40-45 ℃, and the pH value of the obtained emulsion is adjusted to be neutral by sodium bicarbonate.
(4) Filtering the obtained emulsion under the conditions of vacuum degree of 0.08MPa and temperature of 25-30 ℃ to obtain the product. The obtained product can be directly used as a gas-moisture reversal agent without further purification.
The structure characterization infrared spectrum of the product prepared in this example 1 is shown in fig. 8. The mass average molecular weight was 21000.
Evaluating the gas-moisture reversal performance of the product:
the air-wet inverter emulsion prepared in this example was added to deionized water to prepare a 1.2% solution by mass fraction. Grinding and pretreating the condensate gas reservoir rock recovered on site, aging the condensate gas reservoir rock in a prepared solution with the mass fraction of 1.2% for 28 hours, drying the condensate gas reservoir rock at 100 ℃, taking out the condensate gas reservoir rock, standing the condensate gas reservoir rock at room temperature for 4 hours, and measuring contact angles of the deionized water and the n-hexadecane on the surface of the condensate gas reservoir rock by using a JC2000D contact angle measuring instrument, wherein the contact angles of the deionized water and the n-hexadecane are respectively 121 degrees and 109 degrees (as shown in figure 2).
Example 2
The air moisture inverter was prepared as described in example 1, except that the acrylate was changed to ethyl acrylate in steps (1) and (2).
The gas-moisture reversal agent prepared in this example was added with deionized water to prepare a 1.2% solution, the condensate gas reservoir rock was aged for 28 hours, dried at 100 ℃ and taken out and left to stand at room temperature for 4 hours, and the contact angles of the treated deionized water and n-hexadecane on the surface of the condensate gas reservoir rock were measured, and the contact angles of the deionized water and n-hexadecane were 124 ° and 108 ° (as shown in fig. 3).
Example 3
The gas-wet reversal agent was prepared as described in example 1, except that the acrylate in steps (1) and (2) was methyl 2-methacrylate.
The gas-moisture reversal agent prepared in this example was added with deionized water to prepare a 1.2% solution, the condensate gas reservoir rock was aged for 28 hours, dried at 100 ℃ and taken out and left to stand at room temperature for 4 hours, and the contact angles of the treated deionized water and n-hexadecane on the surface of the condensate gas reservoir rock were measured, and the contact angles of the deionized water and n-hexadecane were 127 ° and 95 ° (as shown in fig. 4), respectively.
Example 4
The air moisture inverter was prepared as described in example 1, except that the acrylate in steps (1) and (2) was ethyl-2-methacrylate.
The gas-moisture reversal agent prepared in this example was added with deionized water to prepare a 1.2% solution, the condensate gas reservoir rock was aged for 28 hours, dried at 100 ℃ and taken out and left to stand at room temperature for 4 hours, and the contact angles of the treated deionized water and n-hexadecane on the surface of the condensate gas reservoir rock were measured, and the contact angles of the deionized water and n-hexadecane were 129 ° and 91 ° (as shown in fig. 5).
Example 5
The air-wet reversal agent was prepared as described in example 1, except that in step (1), the amount ratio of the composite emulsifier sodium lauryl sulfate to the polyoxyethylene octylphenol ether material was 1: 1.2.
The gas-moisture reversal agent prepared in this example was added with deionized water to prepare a 1.2% solution, the condensate gas reservoir rock was aged for 28 hours, dried at 100 ℃ and taken out and left to stand at room temperature for 4 hours, and the contact angles of the treated deionized water and n-hexadecane on the surface of the condensate gas reservoir rock were measured, and the contact angles of the deionized water and n-hexadecane were 123 ° and 105 ° (as shown in fig. 6).
Example 6
The air-wet reversal agent was prepared as described in example 1, except that in step (1), the amount ratio of the composite emulsifier sodium lauryl sulfate to the polyoxyethylene octylphenol ether material was 1: 1.4.
The gas-moisture reversal agent prepared in this example was added with deionized water to prepare a 1.2% solution, the condensate gas reservoir rock was aged for 28 hours, dried at 100 ℃ and taken out and left to stand at room temperature for 4 hours, and the contact angles of the treated deionized water and n-hexadecane on the surface of the condensate gas reservoir rock were measured, and the contact angles of the deionized water and n-hexadecane were 122 ° and 96 ° (as shown in fig. 7).
Comparative example 1
The wetting reversal agent RSFZ-5 takes amino silanol and polymeric alcohol as main raw materials. Reference documents: preparation and performance evaluation of fenfrierin, Liuheng, Chenjun and wetting reversal agent [ J ]. drilling fluid and completion fluid, 2013,30(6): 29-32. The mica sheets were treated with a 1% RSFZ-5 solution for 4h and measured to have a contact angle with water of 71.4 deg. after air drying.
Claims (11)
1. A high temperature gas-moisture resistant reversal agent is a polymer with a structure shown in a formula I:
in the formula I, R1Is hydrogen or methyl；R2Is methoxy or ethoxy; the mass average molecular weight is 20000 to 22000.
2. A method for preparing the high temperature resistant gas-moisture reversal agent of claim 1, comprising:
in the presence of persulfate initiator, adding a composite emulsifier and acrylate into an aqueous solution, heating to a reaction temperature, dropwise adding perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, acrylate and perfluorohexyl ethyl methacrylate monomers, wherein the mixing mass ratio of the perfluorooctyl ethyl acrylate, the dodecafluoroheptyl methacrylate, the acrylate and the perfluorohexyl ethyl methacrylate monomers is 2:3 (1-1.5):5, carrying out polymerization reaction, cooling after the reaction is finished, adjusting the pH of the emulsion to be neutral, and filtering to obtain a product;
the composite emulsifier is a mixture of sodium dodecyl sulfate and polyoxyethylene octyl phenol ether (OP-10), the acrylate is selected from methyl acrylate, ethyl acrylate, 2-methyl methacrylate and 2-ethyl methacrylate, and the reaction temperature is 83-87 ℃.
3. The method for preparing the high temperature gas-moisture resistant inverter according to claim 2, comprising the steps of:
(1) adding deionized water, a composite emulsifier and acrylic ester into a reaction kettle provided with a stirrer and a temperature measuring and refluxing device, and uniformly stirring; stirring at high speed for emulsification under the protection of nitrogen, and then adding a persulfate aqueous solution;
(2) heating, when the temperature in the reaction kettle is raised to 70-80 ℃ and kept constant for 30-40 minutes, adding the persulfate aqueous solution again, and after the temperature is kept constant, dropwise adding a monomer mixture of perfluorooctyl ethyl acrylate, dodecafluoroheptyl methacrylate, acrylate and perfluorohexyl ethyl methacrylate through a constant-pressure dropping funnel;
(3) after the monomer mixture is dripped, heating to 82-89 ℃, and reacting for 2.5-4 hours; then cooling and adjusting the pH value of the obtained emulsion to be neutral by using an alkaline substance;
(4) and (4) filtering the emulsion obtained in the step (3) to obtain a product.
4. The method of claim 3, wherein the reaction of step (1) comprises one or more of the following conditions:
a 1: the quantity ratio of the sodium dodecyl sulfate to the polyoxyethylene octyl phenol ether (OP-10) in the composite emulsifier is 1: 0.8-1.8;
a 2: the mass ratio of the deionized water to the composite emulsifier to the acrylic ester is 50 (1-2) to (5-15);
a 3: sequentially adding the ionized water, the composite emulsifier and the acrylic ester into a reaction kettle and stirring for 20-30 minutes;
a 4: the high-speed stirring emulsification time is 30-40 minutes;
a 5: the high-speed stirring emulsification temperature is 30-35 ℃;
a 6: the consumption of the persulfate aqueous solution is 0.5-1.0% by mass, and the total mass of the reaction monomers is used as a base number for calculation.
5. The method of claim 3, wherein the reaction of step (2) comprises one or more of the following conditions:
b 1: the heating is carried out by oil bath;
b 2: adding the persulfate aqueous solution again to ensure that the mass fraction of the persulfate aqueous solution is 1.4-2.0%, and calculating by taking the total mass of the reaction monomers as a base number;
b 3: adding persulfate aqueous solution again, and controlling the constant temperature time to be 10-15 minutes;
b 4: the mixing mass ratio of the perfluorooctyl ethyl acrylate to the dodecafluoroheptyl methacrylate to the acrylate to the perfluorohexyl ethyl methacrylate is 2:3 (1-1.2) to 5;
b 5: the perfluorooctyl ethyl acrylate, the dodecafluoroheptyl methacrylate, the acrylate and the perfluorohexyl ethyl methacrylate are mixed in sequence, namely, the perfluorooctyl ethyl acrylate and the dodecafluoroheptyl methacrylate are added firstly, the acrylate is added, and finally the perfluorohexyl ethyl methacrylate is added, and the whole mixing process is carried out under the stirring condition.
6. The method of claim 3, wherein the reaction of step (3) comprises one or more of the following conditions:
c 1: the reaction temperature is controlled at 84-86 ℃;
c 2: the reaction time is controlled to be 3-3.5 hours;
c 3: cooling to 40-45 deg.c;
c 4: the alkaline substance is sodium carbonate or sodium bicarbonate.
7. The method for preparing the high temperature resistant gas-moisture reversal agent according to claim 3, wherein in the step (4), the filtration is performed under a vacuum degree of 0.08 to 0.09MPa and at a temperature of 25 to 30 ℃.
8. The method for preparing the high-temperature-resistant gas-moisture reversal agent according to claim 3, wherein in the step (1), the amount ratio of the sodium dodecyl sulfate to the polyoxyethylene octyl phenol ether in the composite emulsifier is 1: 1-1.4; the mass ratio of the deionized water to the composite emulsifier to the acrylate is 50:1: 10.
9. The method for preparing the high temperature gas-moisture resistant inverter according to claim 3, wherein the reaction temperature in the step (3) is 85 ℃; the reaction time was 3 hours.
10. Use of the polymer of formula I according to claim 1 as a high temperature gas moisture reversal agent for condensate gas reservoirs to change the wettability of the surface of the reservoir in the vicinity of the wellbore of the condensate gas reservoir from liquid-wet reversal to strong gas-wet reversal for enhanced recovery of the condensate gas reservoir.
11. Use according to claim 10, characterized in that the method of application is as follows:
and preparing the high-temperature-resistant gas-moisture reversal agent and deionized water into a solution with the mass fraction of 0.5-2%, and allowing the solution and the wellbore working fluid to enter a condensate gas reservoir.
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|---|---|---|---|
| CN201911310714.1A CN111004348B (en) | 2019-12-18 | 2019-12-18 | High-temperature-resistant gas-moisture reversal agent capable of improving recovery ratio of condensate gas reservoir and preparation method and application thereof |
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| CN201911310714.1A CN111004348B (en) | 2019-12-18 | 2019-12-18 | High-temperature-resistant gas-moisture reversal agent capable of improving recovery ratio of condensate gas reservoir and preparation method and application thereof |
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| Publication Number | Publication Date |
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Citations (3)
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| US20140275665A1 (en) * | 2013-03-14 | 2014-09-18 | Dennis John O'Rear | Process, Method, and System for Removing Heavy Metals from Oily Solids |
| CN104693384A (en) * | 2015-02-03 | 2015-06-10 | 中国石油大学(华东) | Gas-wetting reversal agent fluorine-containing amphiphilic block polymer emulsion and preparation method thereof |
| CN105085814A (en) * | 2015-09-10 | 2015-11-25 | 中国石油大学(华东) | Preparation method of air wetting reversal material based on mussel bionic principle |
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| US20140275665A1 (en) * | 2013-03-14 | 2014-09-18 | Dennis John O'Rear | Process, Method, and System for Removing Heavy Metals from Oily Solids |
| CN104693384A (en) * | 2015-02-03 | 2015-06-10 | 中国石油大学(华东) | Gas-wetting reversal agent fluorine-containing amphiphilic block polymer emulsion and preparation method thereof |
| CN105085814A (en) * | 2015-09-10 | 2015-11-25 | 中国石油大学(华东) | Preparation method of air wetting reversal material based on mussel bionic principle |
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| "凝析气藏氟碳气湿反转剂FC-1的室内研究";李颖颖等;《油田化学》;20121225;第29卷(第4期);第435-438页 * |
| 李颖颖等."凝析气藏氟碳气湿反转剂FC-1的室内研究".《油田化学》.2012,第29卷(第4期),第435-438页. * |
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