CN110698589B - High-molecular profile control and plugging agent, and preparation method and application thereof - Google Patents
High-molecular profile control and plugging agent, and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a high-molecular plugging agent and a preparation method and application thereof, belonging to the technical field of oil exploitation. The high-molecular profile control agent comprises an oil phase and a water phase, wherein the oil phase comprises white oil and a composite emulsifier; the water phase comprises acrylamide, acrylic acid, dimethyl allyl ammonium chloride, 2-acrylamide-2-methyl propanesulfonic acid, N-methylene bisacrylamide, an initiator and water. The high-molecular plugging agent provided by the embodiment of the invention is prepared by taking white oil as a dispersion medium, acrylamide, acrylic acid, a cationic monomer, namely dimethyl allyl ammonium chloride, and an anionic monomer, namely 2-acrylamide-2-methylpropanesulfonic acid, as a polymer monomer, and N, N-methylene bisacrylamide as a cross-linking agent through a reverse microemulsion polymerization method under the initiation action of ammonium persulfate-ammonium bisulfite in a redox system, and has the advantages of low preparation cost, excellent high temperature resistance, high pressure resistance and good plugging effect.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to a high-molecular plugging agent and a preparation method and application thereof.
Background
As petroleum development enters the middle and later stages, oil layer channeling sealing, profile control and plugging are developed into indispensable important measures, the oil layer channeling sealing and plugging are used for plugging a stratum perforated oil layer or an oil layer string layer, cement plugging, polymer plugging, high-strength resin plugging and the like are commonly used in field construction at present, and the technologies are widely applied in oil field development, but have the following problems: (1) the cement plugging has poor high temperature and high pressure resistance and poor plugging effect; (2) the polymer plugging agent is salt-sensitive, thermosensitive, multi-pseudo-ion flocculation and the like, so that the application range is limited; (3) the resin plugging is to use high-strength resin materials, namely phenolic resin, epoxy resin, urea resin and the like, and the curing is formed by adjusting the formula, so that an oil layer is plugged.
In addition, oil layer profile control is commonly used in oil fields at present as a chemical profile control agent, organogel and solid-phase particles are used for plugging a stratum string layer channel, the contradiction between the longitudinal direction and the transverse direction of an oil layer can be solved, but the chemical particles block a steam injection channel, so that the reservoir is easily damaged, major overhaul and other serious operation construction are easily caused, and a huge risk exists, so that the development of the profile control agent is urgently needed at present to provide oil layer plugging quality and reduce the operation cost.
Disclosure of Invention
The embodiment of the invention aims to provide a high-molecular profile control agent to solve the problems in the background technology.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
a high-molecular profile control agent comprises an oil phase and a water phase, wherein the mass ratio of the oil phase to the water phase is (1-3) to 1; the oil phase comprises the following components in parts by weight: 40-70 parts of white oil and 8-18 parts of a composite emulsifier; the water phase comprises the following components in parts by weight: 50-90 parts of acrylamide, 10-30 parts of acrylic acid, 3-8 parts of dimethyl allyl ammonium chloride, 5-15 parts of 2-acrylamide-2-methyl propane sulfonic acid, 0.5-2 parts of N, N-methylene-bis-acrylamide, 0.05-0.5 part of an initiator and 300-500 parts of water.
Preferably, the oil phase comprises the following components in parts by weight: 50-60 parts of white oil and 10-15 parts of composite emulsifier.
Preferably, the water phase comprises the following components in parts by weight: 60-80 parts of acrylamide, 15-25 parts of acrylic acid, 4-6 parts of dimethyl allyl ammonium chloride, 8-12 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.8-1.2 parts of N, N-methylene-bis-acrylamide, 0.1-0.2 part of an initiator and 380-450 parts of water.
Preferably, the mass ratio of the oil phase to the water phase is 2: 1.
Preferably, the compound emulsifier comprises span 80 and tween 80; the mass ratio of span 80 to Tween 80 is (1-2) to 1.
Preferably, the initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is (1-2) to (1-2).
Preferably, the pH value of the water phase is 6-8.
Another object of an embodiment of the present invention is to provide a method for preparing the polymer plugging agent, which comprises the following steps:
weighing white oil, a composite emulsifier, acrylamide, acrylic acid, dimethyl allyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid, N-methylene bisacrylamide, an initiator and water according to the weight parts of the components for later use;
mixing the white oil and the composite emulsifier under a protective atmosphere at the temperature of 40-60 ℃ to obtain an oil phase for later use;
adding the acrylamide, the acrylic acid, the dimethyl allyl ammonium chloride and the 2-acrylamide-2 methyl propanesulfonic acid into the water for dissolving to obtain a monomer solution;
adjusting the pH value of the monomer solution to 6-8, adding N, N-methylene bisacrylamide and an initiator into the monomer solution, and mixing to obtain a water phase for later use;
and (3) dropwise adding the water phase into the oil phase according to the mass ratio of the oil phase to the water phase of (1-3): 1, and reacting in a constant-temperature sealed environment at 40-60 ℃ to obtain the high-molecular plugging agent.
The embodiment of the invention also aims to provide the high-molecular profile control and plugging agent prepared by the preparation method.
Another object of an embodiment of the present invention is to provide an application of the polymer plugging agent in oil layer plugging.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the polymer plugging agent provided by the embodiment of the invention is prepared by taking white oil as a dispersion medium, span 80 and tween 80 as a composite emulsifier, and respectively taking acrylamide, acrylic acid, a cationic monomer, namely dimethyl allyl ammonium chloride, and an anionic monomer, namely 2-acrylamide-2-methylpropanesulfonic acid, as polymer monomers, taking N, N-methylene bisacrylamide as a cross-linking agent, and under the initiation action of ammonium persulfate-ammonium bisulfite in a redox system, by using a reverse microemulsion polymerization method, and has the advantages of low preparation cost, excellent high temperature resistance and excellent high pressure resistance. In addition, the high-molecular plugging agent can effectively plug oil layers, outer string layers and the like, has good plugging effect, has the plugging success rate of over 99.9 percent, and is convenient for large-scale popularization and use.
Drawings
FIG. 1 shows the consistency of the polymeric plugging agent provided in example 5 at 120 ℃ and 80 MPa.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a high-molecular profile control and plugging agent, and the preparation method of the high-molecular profile control and plugging agent comprises the following steps:
(1) weighing 400g of white oil, 80g of composite emulsifier, 50g of acrylamide, 10g of acrylic acid, 3g of dimethyl allyl ammonium chloride, 5g of 2-acrylamide-2-methylpropanesulfonic acid, 0.5g of N, N-methylene-bisacrylamide, 0.05g of initiator and 300g of water for later use. Wherein, the compound emulsifier comprises span 80 and Tween 80; the mass ratio of the span 80 to the Tween 80 is 1: 1. The initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is 1: 1.
(2) Adding the white oil and the compound emulsifier into a container provided with a thermometer, a stirrer and a condensation reflux device under the protection atmosphere of nitrogen, heating in a constant-temperature water bath at 40 ℃, and stirring and mixing for 20min to obtain an oil phase for later use.
(3) The above acrylamide, acrylic acid, dimethylallyl ammonium chloride, and 2-acrylamide-2-methylpropanesulfonic acid were added to the above water and dissolved to obtain a monomer solution.
(4) The pH value of the monomer solution is adjusted to 6 by NaOH, and N, N-methylene bisacrylamide and an initiator are added into the monomer solution to be stirred and mixed to obtain a water phase for later use.
(5) And (3) quickly dropwise adding the water phase into the oil phase according to the mass ratio of the oil phase to the water phase of 3:1, and reacting for 4 hours in a constant-temperature sealed environment at 40 ℃ to obtain the high-molecular plugging modifier.
Example 2
The embodiment provides a high-molecular profile control and plugging agent, and the preparation method of the high-molecular profile control and plugging agent comprises the following steps:
(1) weighing 700g of white oil, 180g of composite emulsifier, 90g of acrylamide, 30g of acrylic acid, 8g of dimethyl allyl ammonium chloride, 15g of 2-acrylamide-2-methylpropanesulfonic acid, 2g of N, N-methylene-bisacrylamide, 0.5g of initiator and 500g of water for later use. Wherein, the compound emulsifier comprises span 80 and Tween 80; the mass ratio of the span 80 to the Tween 80 is 2: 1. The initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is 2: 1.
(2) Adding the white oil and the compound emulsifier into a container provided with a thermometer, a stirrer and a condensation reflux device under the protection atmosphere of nitrogen, heating in a constant-temperature water bath at 60 ℃, and stirring and mixing for 20min to obtain an oil phase for later use.
(3) The above acrylamide, acrylic acid, dimethylallyl ammonium chloride, and 2-acrylamide-2-methylpropanesulfonic acid were added to the above water and dissolved to obtain a monomer solution.
(4) The pH value of the monomer solution is adjusted to 8 by NaOH, and N, N-methylene bisacrylamide and an initiator are added into the monomer solution to be stirred and mixed to obtain a water phase for later use.
(5) And (3) quickly dropwise adding the water phase into the oil phase according to the mass ratio of the oil phase to the water phase of 3:1, and reacting for 4 hours in a constant-temperature sealing environment at 60 ℃ to obtain the high-molecular plugging modifier.
Example 3
The embodiment provides a high-molecular profile control and plugging agent, and the preparation method of the high-molecular profile control and plugging agent comprises the following steps:
(1) weighing 500g of white oil, 100g of composite emulsifier, 60g of acrylamide, 15g of acrylic acid, 4g of dimethyl allyl ammonium chloride, 8g of 2-acrylamide-2-methylpropanesulfonic acid, 0.8g of N, N-methylene-bisacrylamide, 0.1g of initiator and 380g of water for later use. Wherein, the compound emulsifier comprises span 80 and Tween 80; the mass ratio of span 80 to tween 80 is 1.5: 1. The initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is 1: 2.
(2) Adding the white oil and the compound emulsifier into a container provided with a thermometer, a stirrer and a condensation reflux device under the protection atmosphere of nitrogen, heating in a constant-temperature water bath at 50 ℃, and stirring and mixing for 20min to obtain an oil phase for later use.
(3) The above acrylamide, acrylic acid, dimethylallyl ammonium chloride, and 2-acrylamide-2-methylpropanesulfonic acid were added to the above water and dissolved to obtain a monomer solution.
(4) The pH value of the monomer solution is adjusted to 7 by NaOH, and N, N-methylene bisacrylamide and an initiator are added into the monomer solution to be stirred and mixed to obtain a water phase for later use.
(5) And (3) quickly dropwise adding the water phase into the oil phase according to the mass ratio of the oil phase to the water phase of 2:1, and reacting for 4 hours in a constant-temperature sealed environment at 50 ℃ to obtain the high-molecular plugging agent.
Example 4
The embodiment provides a high-molecular profile control and plugging agent, and the preparation method of the high-molecular profile control and plugging agent comprises the following steps:
(1) weighing 600g of white oil, 150g of composite emulsifier, 80g of acrylamide, 25g of acrylic acid, 6g of dimethyl allyl ammonium chloride, 12g of 2-acrylamide-2-methylpropanesulfonic acid, 1.2g of N, N-methylene-bisacrylamide, 0.2g of initiator and 450g of water for later use. Wherein, the compound emulsifier comprises span 80 and Tween 80; the mass ratio of span 80 to tween 80 is 1.5: 1. The initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is 1.5: 1.
(2) Adding the white oil and the compound emulsifier into a container provided with a thermometer, a stirrer and a condensation reflux device under the protection atmosphere of nitrogen, heating in a constant-temperature water bath at 50 ℃, and stirring and mixing for 20min to obtain an oil phase for later use.
(3) The above acrylamide, acrylic acid, dimethylallyl ammonium chloride, and 2-acrylamide-2-methylpropanesulfonic acid were added to the above water and dissolved to obtain a monomer solution.
(4) The pH value of the monomer solution is adjusted to 7 by NaOH, and N, N-methylene bisacrylamide and an initiator are added into the monomer solution to be stirred and mixed to obtain a water phase for later use.
(5) And (3) quickly dropwise adding the water phase into the oil phase according to the mass ratio of the oil phase to the water phase of 2:1, and reacting for 4 hours in a constant-temperature sealed environment at 50 ℃ to obtain the high-molecular plugging agent.
Example 5
The embodiment provides a high-molecular profile control and plugging agent, and the preparation method of the high-molecular profile control and plugging agent comprises the following steps:
(1) weighing 540g of white oil, 120g of composite emulsifier, 70g of acrylamide, 20g of acrylic acid, 5g of dimethyl allyl ammonium chloride, 10g of 2-acrylamide-2-methyl propanesulfonic acid, 0.945g of N, N-methylene-bisacrylamide, 0.1575g of initiator and 420g of water for later use. Wherein, the compound emulsifier comprises span 80 and Tween 80; the mass ratio of span 80 to tween 80 is 1.5: 1. The initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is 2: 1.
(2) Adding the white oil and the compound emulsifier into a container provided with a thermometer, a stirrer and a condensation reflux device under the protection atmosphere of nitrogen, heating in a constant-temperature water bath at 50 ℃, and stirring and mixing for 20min to obtain an oil phase for later use.
(3) The above acrylamide, acrylic acid, dimethylallyl ammonium chloride, and 2-acrylamide-2-methylpropanesulfonic acid were added to the above water and dissolved to obtain a monomer solution.
(4) The pH value of the monomer solution is adjusted to 7 by NaOH, and N, N-methylene bisacrylamide and an initiator are added into the monomer solution to be stirred and mixed to obtain a water phase for later use.
(5) And (3) quickly dropwise adding the water phase into the oil phase according to the mass ratio of the oil phase to the water phase of 2:1, and reacting for 4 hours in a constant-temperature sealed environment at 50 ℃ to obtain the high-molecular plugging agent.
The polymer plugging agent obtained in the embodiment 5 is subjected to performance test by using a core dynamic simulation device, specifically, the core is evacuated, and the water phase permeability K before plugging is measured by using saturated water0Then, at different K0Injecting 1-time volume of the polymer plugging agent obtained in the embodiment 5 into the two groups of sand-filled pipe models, sealing two ends of the sand-filled pipe models, placing the sand-filled pipe models at 120 ℃ for curing for 72 hours, taking out the cured sand-filled pipe models, driving water in the reverse sand-filled pipe models, and measuring the water phase permeability K after plugging1Test data are recorded, and the results of the core plugging rate and the breakthrough pressure of the high-molecular plugging agent obtained through testing are shown in the following table 1.
TABLE 1
The prepared polymer plugging agent slurry of the embodiment 5 is poured into 4 moulds respectively, and is cured for 72 hours in a pressurized curing kettle with the temperature of 120 ℃ and the pressure of 30MPa, the solidified bodies of the plugging agent are taken out, the compression strength of the solidified bodies of the plugging agent is tested on a pressure tester respectively, and the detection results of the 4 solidified bodies of the plugging agent are 30.54MPa, 31.6MPa, 30.51MPa and 30.59M Pa respectively, namely the average compression strength of the polymer plugging agent provided by the embodiment 5 is 30.81MPa, which shows that the polymer plugging agent provided by the embodiment of the invention has better high pressure resistance.
In addition, the polymer plugging agent of the above example 5 was poured into a sample cup of a 8040B10 type high temperature and high pressure densitometer, and then the thickening time of the polymer plugging agent was measured under the conditions of 120 ℃ and 80MPa, and the test results are shown in FIG. 1. As can be seen from the figure, the high molecular plugging agent provided by the embodiment of the invention can also keep a good plugging effect under the well conditions of high temperature and high pressure.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. The high-molecular profile control agent is characterized by comprising an oil phase and a water phase, wherein the mass ratio of the oil phase to the water phase is (1-3) to 1; the oil phase comprises the following components in parts by weight: 50-60 parts of white oil and 10-15 parts of a composite emulsifier; the water phase comprises the following components in parts by weight: 60-80 parts of acrylamide, 15-25 parts of acrylic acid, 4-6 parts of dimethyl allyl ammonium chloride, 8-12 parts of 2-acrylamide-2-methyl propanesulfonic acid, 0.8-1.2 parts of N, N-methylene-bis-acrylamide, 0.1-0.2 part of an initiator and 380-450 parts of water;
the preparation method of the high-molecular profile control and plugging agent comprises the following steps:
weighing white oil, a composite emulsifier, acrylamide, acrylic acid, dimethyl allyl ammonium chloride, 2-acrylamide-2-methylpropanesulfonic acid, N-methylene bisacrylamide, an initiator and water according to the weight parts of the components for later use;
mixing the white oil and the composite emulsifier under a protective atmosphere at the temperature of 40-60 ℃ to obtain an oil phase for later use;
adding the acrylamide, the acrylic acid, the dimethyl allyl ammonium chloride and the 2-acrylamide-2 methyl propanesulfonic acid into the water for dissolving to obtain a monomer solution;
adjusting the pH value of the monomer solution to 6-8, adding N, N-methylene bisacrylamide and an initiator into the monomer solution, and mixing to obtain a water phase for later use;
according to the mass ratio of the oil phase to the water phase of (1-3): 1, dropwise adding the water phase into the oil phase, and placing the mixture in a constant-temperature sealed environment at 40-60 ℃ for reaction to obtain the high-molecular plugging agent;
the compound emulsifier comprises span 80 and tween 80; the mass ratio of span 80 to Tween 80 is (1-2) to 1;
the initiator comprises ammonium persulfate and ammonium bisulfite; the mass ratio of the ammonium persulfate to the ammonium bisulfite is (1-2) to (1-2).
2. The high molecular weight profile control agent according to claim 1, wherein the mass ratio of the oil phase to the water phase is 2: 1.
3. The polymeric profile control agent according to claim 1 or 2, wherein the pH of the aqueous phase is 6 to 8.
4. Use of the polymeric profile control agent according to any one of claims 1 to 3 in oil reservoir plugging.
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| JP2006192403A (en) * | 2005-01-17 | 2006-07-27 | Tokyo Electric Power Environmental Engineering Co Inc | Method for reducing water content in dewatered sludge |
| CN103951785A (en) * | 2014-04-01 | 2014-07-30 | 中国石油天然气股份有限公司 | Fracturing fluid drag reducer, and preparation method and application thereof |
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| CN104231162B (en) * | 2013-06-17 | 2016-08-24 | 中国石油化工股份有限公司 | Polyacrylamide reverse microemulsion and preparation method thereof |
| CN104231168A (en) * | 2014-09-22 | 2014-12-24 | 陕西科技大学 | Polymer microsphere temporary plugging agent with ultralow interfacial tension and preparation method thereof |
| CN107794013A (en) * | 2016-08-31 | 2018-03-13 | 盘锦百利化工有限公司 | A kind of high temperature resistant plugging agent for heavy crude heat extraction and preparation method thereof |
| CN109575184B (en) * | 2017-09-28 | 2020-10-30 | 中国石油化工股份有限公司 | Inverse emulsion self-crosslinkable profile control water shutoff agent and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006192403A (en) * | 2005-01-17 | 2006-07-27 | Tokyo Electric Power Environmental Engineering Co Inc | Method for reducing water content in dewatered sludge |
| CN103951785A (en) * | 2014-04-01 | 2014-07-30 | 中国石油天然气股份有限公司 | Fracturing fluid drag reducer, and preparation method and application thereof |
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