CN112780219A - Targeted release water shutoff agent - Google Patents
Targeted release water shutoff agent Download PDFInfo
- Publication number
- CN112780219A CN112780219A CN202110208587.5A CN202110208587A CN112780219A CN 112780219 A CN112780219 A CN 112780219A CN 202110208587 A CN202110208587 A CN 202110208587A CN 112780219 A CN112780219 A CN 112780219A
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- Prior art keywords
- water shutoff
- release
- shutoff agent
- material layer
- environment
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
Abstract
The invention discloses a targeted release water shutoff agent, which comprises a slow release wrapping material layer, an environment response material layer and a nano water shutoff agent from outside to inside, wherein the slow release wrapping material layer can reduce the loss of the nano water shutoff agent and the environment response material, avoid unnecessary well wall pollution and reduce the occurrence of the agglomeration phenomenon of the water shutoff agent; the environment response material layer can control the release channel of the nano water shutoff agent according to the environment condition, so that the release of the nano water shutoff agent is controlled. The invention combines the slow release material, the environment response material and the water shutoff agent, greatly reduces the loss and pollution of the on-way water shutoff agent, and can more accurately shutoff a target water layer to realize targeted water shutoff.
Description
Technical Field
The invention relates to the technical field of yield increasing transformation of oil and gas wells, in particular to a targeted release water shutoff agent.
Background
In the process of oil field development, the effluent of an oil layer can bring serious influence to the oil field development work, and even the final recovery rate of the oil field is reduced. After the oil well produces water, a water producing layer position is determined firstly, and then plugging is carried out by adopting a water plugging method. The purpose of water shutoff is to control the flow of water in a water producing layer and change the flow direction of water in water displacement, improve the water displacement efficiency, try to make the water yield of an oil field reduced or stable within a period of time so as to keep the yield increase or stable yield of the oil field and improve the final recovery ratio of the oil field.
The large amount of produced water of a production well becomes a serious problem in the current oilfield exploitation, profile control and water shutoff operation becomes one of the most effective ways for improving the oilfield recovery efficiency, and for a high-temperature and high-salinity oilfield, a common polymer water shutoff system often has a series of problems of too short gelling time, incapability of deep profile control, poor thermal stability, short effective water shutoff time and the like. At present, a plurality of temperature-resistant and salt-resistant water plugging systems are developed at home and abroad, but most of the systems are difficult to be widely applied due to the defects of high cost, no environmental protection, poor stability and the like.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a targeted release water shutoff agent, which can be released under a certain water saturation degree under the condition of being wrapped by adding an environment response type material, so that the effective acting time of the water shutoff agent is prolonged, the waste of resources is reduced, and the pollution of a stratum is reduced.
The technical scheme of the invention is as follows:
a targeted release water shutoff agent comprises a slow release wrapping material layer, an environment response material layer and a nano water shutoff agent from outside to inside.
Preferably, the slow release coating material layer can protect the environment response material layer, prevent the environment response material layer from contacting with a well wall and a non-target layer, and can be completely dissolved and released according to the temperature and pressure of a stratum when a target point is reached.
Preferably, the slow release coating material layer is made of any one of cellulose, chitosan, protein, lignin, polylactic acid and copolymers thereof, polyanhydrides, polypeptide and amino acid polymers, polyvinyl alcohol, nano solid chlorine dioxide slow release agents, epoxy resin 506 and maleic anhydride compounds, polyacrylamide/diatomite composite hydrogel, slow release salt inhibitors prepared by combining epoxy resin and starch, styrene-maleic anhydride copolymers and nano silicon dioxide.
Preferably, the environment-responsive material layer is an intelligent controlled-release microcapsule, the wall of the intelligent controlled-release microcapsule has a porous structure, and a linear environment-responsive intelligent macromolecular chain is grafted in a membrane pore of the porous structure, and the macromolecular chain can change the conformation of the macromolecular chain according to the change of the external environment and generate conformational transition between expansion and contraction, so that the effective pore diameter and the permeability of the intelligent controlled-release microcapsule are changed, and the controlled release of the internal-loaded nano water shutoff agent is realized.
Preferably, the environment-responsive material layer is a temperature-responsive intelligent controlled-release microcapsule, and the temperature-responsive intelligent controlled-release microcapsule is a temperature-sensitive polymer switch chain grafted in a membrane pore of a porous microcapsule.
Preferably, the thermo-sensitive polymer switch chain is poly (N-isopropylacrylamide); the low critical solution temperature of the poly (N-isopropylacrylamide) is within the range of 31-33 ℃, and when the ambient temperature is lower than the low critical solution temperature, the poly (N-isopropylacrylamide) macromolecular chains are in an extended conformation, so that the release of the nano water shutoff agent is limited; when the environmental temperature is higher than the low critical solution temperature, the poly (N-isopropylacrylamide) macromolecular chain is in a contracted conformation, so that the membrane pores are opened, and the nano water shutoff agent is released.
Preferably, the environment-responsive material layer is an ion recognition-responsive intelligent controlled-release microcapsule, and the ion recognition-responsive intelligent controlled-release microcapsule is a poly (N-isopropylacrylamide-co- (benzo-18-crown-6-acrylamide)) polymer chain grafted in pores of the polyamide porous microcapsule by using a plasma-induced graft polymerization method as an ion recognition-responsive switch.
The invention has the beneficial effects that:
according to the invention, the loss of the nano water shutoff agent and the environmental response material can be reduced through the outermost slow release coating material layer, unnecessary well wall pollution is avoided, and the agglomeration phenomenon of the water shutoff agent is reduced; the controlled release of the nano water shutoff agent is realized through the extension-contraction characteristic of a special polymer graft chain in a membrane hole of the environmental response material, so that the aim of targeted water shutoff is fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of the targeted release water shutoff agent of the present invention;
FIG. 2 is a schematic structural diagram of the environmental response material layer of the targeted release water shutoff agent according to the present invention when the membrane pores are closed;
fig. 3 is a schematic structural diagram of the environmental response material layer of the targeted release water shutoff agent of the invention when the membrane pores are opened.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict. It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
As shown in fig. 1, the invention provides a targeted release water shutoff agent, which comprises a slow release wrapping material layer, an environment response material layer and a nano water shutoff agent from outside to inside.
The slow release coating material layer can protect the environment response material layer, prevent the environment response material layer from contacting with a well wall and a non-target layer to aggregate and pollute the well wall, and can be completely dissolved and released according to the temperature and the pressure of a stratum when a target point is reached.
The environment response material layer is an intelligent controlled release microcapsule, the capsule wall of the intelligent controlled release microcapsule is provided with a porous structure, a linear environment response type intelligent macromolecular chain is grafted in a membrane hole of the porous structure, and the macromolecular chain can change the conformation of the macromolecular chain according to the change of the external environment and generate the conformation transition between expansion and contraction, so that the effective aperture and the permeability of the intelligent controlled release microcapsule are changed, and the controlled release of the internal-loaded nano water shutoff agent is realized. The external environment is any one or more of temperature, pH, magnetic field and water saturation.
The working principle of the targeted release water shutoff agent is as follows: configuring a targeted release water shutoff agent as shown in figure 1; in the process from the injection well to the target layer, the material of the slow release coating material layer is continuously dissolved and released, and after the target layer is reached, the material is completely dissolved, as shown in figure 2; the stretching-shrinking state of the polymer chains is changed by controlling the conformation of the polymer chains, so that the membrane pores of the environment response material layer are closed and opened; when the macromolecular chain is in an extended conformation, as shown in fig. 2, the release channel of the nano water shutoff agent is closed, and the release of the nano water shutoff agent is limited; when the polymer chain is in a contracted conformation, as shown in fig. 3, a release channel of the nano water shutoff agent is opened, thereby releasing the nano water shutoff agent.
In a specific embodiment, the slow release coating material layer is made of any one of cellulose, chitosan, protein, lignin, polylactic acid and copolymers thereof, polyanhydride, polypeptide and amino acid polymers, polyvinyl alcohol, a nano solid chlorine dioxide slow release agent, a compound of epoxy resin 506 and maleic anhydride, polyacrylamide/diatomite composite hydrogel, a slow release salt inhibitor prepared by combining epoxy resin and starch, a styrene-maleic anhydride copolymer and nano silicon dioxide.
In a specific embodiment, the environment-responsive material layer is a temperature-responsive intelligent controlled-release microcapsule, and the temperature-responsive intelligent controlled-release microcapsule is a thermo-sensitive polymer switch chain grafted in a membrane pore of a porous microcapsule. The temperature-sensitive high-molecular switch chain is poly (N-isopropyl acrylamide); the low critical solution temperature of the poly (N-isopropylacrylamide) is within the range of 31-33 ℃, and when the ambient temperature is lower than the low critical solution temperature, the poly (N-isopropylacrylamide) macromolecular chains are in an extended conformation, so that the release of the nano water shutoff agent is limited; when the environmental temperature is higher than the low critical solution temperature, the poly (N-isopropylacrylamide) macromolecular chain is in a contracted conformation, so that the membrane pores are opened, and the nano water shutoff agent is released.
In another specific embodiment, the environment-responsive material layer is an ion recognition-responsive intelligent controlled-release microcapsule, and the ion recognition-responsive intelligent controlled-release microcapsule is formed by grafting a poly (N-isopropylacrylamide-co- (benzo-18-crown-6-acrylamide)) high-molecular chain as an ion recognition-responsive switch in the pores of a polyamide porous microcapsule by using a plasma-induced graft polymerization method.
In a specific embodiment, the polymeric chains are capable of changing the conformation of the polymeric chains according to changes in water saturation; when the water saturation is less than the critical water saturation, the macromolecular chain is in a stretching state, so that the membrane pores are closed, and the release of the nano water shutoff agent is limited; when the water saturation is more than or equal to the critical water saturation, the polymer chain is in a shrinkage state, so that the membrane pores are opened, and the nano water plugging agent is released.
It should be noted that the innermost nano water shutoff agent in the targeted release water shutoff agent of the invention may be any nano water shutoff agent in the prior art, and may be specifically selected according to the formation conditions, the water shutoff requirements, and the like.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The targeted release water shutoff agent is characterized by comprising a slow release coating material layer, an environment response material layer and a nano water shutoff agent from outside to inside.
2. The targeted release water shutoff agent according to claim 1, wherein the slow release coating material layer protects the environment response material layer, prevents the environment response material layer from contacting with the well wall and non-target layer, agglomerating and polluting, and can be completely dissolved and released according to the temperature and pressure of the stratum when reaching the target point.
3. The targeted release water shutoff agent according to claim 2, wherein the slow release coating material layer is made of any one of cellulose, chitosan, protein, lignin, polylactic acid and its copolymer, polyanhydride, polypeptide and amino acid polymer, polyvinyl alcohol, nano solid chlorine dioxide slow release agent, epoxy resin 506 and maleic anhydride compound, polyacrylamide/diatomite composite hydrogel, slow release salt inhibitor prepared by combining epoxy resin and starch, styrene-maleic anhydride copolymer and nano silicon dioxide.
4. The targeted release water shutoff agent according to claim 1, wherein the environment-responsive material layer is an intelligent controlled-release microcapsule, the wall of the intelligent controlled-release microcapsule has a porous structure, and a linear environment-responsive intelligent macromolecular chain is grafted in pores of the membrane of the porous structure, and the macromolecular chain can change the conformation of the macromolecular chain according to the change of the external environment and undergo conformational transition between expansion and contraction, thereby changing the effective pore diameter and permeability of the intelligent controlled-release microcapsule and realizing the controlled release of the internal-loaded nano water shutoff agent.
5. The targeted release water shutoff agent according to claim 4, wherein the environment-responsive material layer is a temperature-responsive intelligent controlled-release microcapsule, and the temperature-responsive intelligent controlled-release microcapsule is a temperature-sensitive polymer switch chain grafted in pores of a porous microcapsule.
6. The targeted release water shutoff agent according to claim 5, wherein the temperature-sensitive macromolecule switch chain is poly (N-isopropylacrylamide); the low critical solution temperature of the poly (N-isopropylacrylamide) is within the range of 31-33 ℃, and when the ambient temperature is lower than the low critical solution temperature, the poly (N-isopropylacrylamide) macromolecular chains are in an extended conformation, so that the release of the nano water shutoff agent is limited; when the environmental temperature is higher than the low critical solution temperature, the poly (N-isopropylacrylamide) macromolecular chain is in a contracted conformation, so that the membrane pores are opened, and the nano water shutoff agent is released.
7. The targeted release water shutoff agent according to claim 4, wherein the environment-responsive material layer is an ion recognition-responsive intelligent controlled-release microcapsule, and the ion recognition-responsive intelligent controlled-release microcapsule is formed by grafting a poly (N-isopropylacrylamide-co- (benzo-18-crown-6-acrylamide)) polymer chain as an ion recognition response switch in the membrane pores of the polyamide porous microcapsule by using a plasma-induced graft polymerization method.
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| CN202110208587.5A CN112780219A (en) | 2021-02-24 | 2021-02-24 | Targeted release water shutoff agent |
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| CN202110208587.5A CN112780219A (en) | 2021-02-24 | 2021-02-24 | Targeted release water shutoff agent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115678521A (en) * | 2022-11-03 | 2023-02-03 | 西南石油大学 | Temporary plugging agent for reservoir protection and preparation method thereof |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1348761A (en) * | 2001-10-26 | 2002-05-15 | 四川大学 | Targeting controlled-release microcapsule capable of inducing environment information quickly |
| US20090192053A1 (en) * | 2004-05-13 | 2009-07-30 | Baker Hughes Incorporated | Methods and Compositions for Delayed Release of Chemicals and Particles |
| CN102108293A (en) * | 2009-12-23 | 2011-06-29 | 中国石油天然气股份有限公司 | Preparation method of slow-release rubber breaking agent for chemical temporary-plugging rubber plug |
| CN102627954A (en) * | 2012-03-26 | 2012-08-08 | 扬州大学 | Sodium persulfate microcapsule capable of controllable concentrated release at fixed time and preparation method thereof |
| US20130056215A1 (en) * | 2011-09-07 | 2013-03-07 | Baker Hughes Incorporated | Disintegrative Particles to Release Agglomeration Agent for Water Shut-Off Downhole |
| US20150210824A1 (en) * | 2014-01-24 | 2015-07-30 | Baker Hughes Incorporated | Nanocomposite microgels, methods of manufacture, and uses thereof |
| CN105169398A (en) * | 2014-06-12 | 2015-12-23 | 华东理工大学 | Meso-porous silicon oxide nanoparticle-based controlled release system and preparation method thereof |
| CN106281267A (en) * | 2016-07-26 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of pH value quick gel water-plugging profile control agent |
| CN108187066A (en) * | 2017-12-29 | 2018-06-22 | 中国药科大学 | A kind of nano-carrier for realizing drug controlled release and preparation method thereof |
| CN108503744A (en) * | 2018-03-28 | 2018-09-07 | 中国石油大学(华东) | Acrylic emulsion and its preparation method and application with nucleocapsid |
| US20180298274A1 (en) * | 2015-04-30 | 2018-10-18 | Johnson Matthey Public Limited Company | Oil field chemical delivery fluids, methods for their use in the targeted delivery of oil field chemicals to subterranean hydrocarbon reservoirs and methods for tracing fluid flow |
| CN110157401A (en) * | 2019-05-06 | 2019-08-23 | 中国石油天然气股份有限公司 | A kind of preparation method of controllable long-acting slow-release scale inhibition agent capsules |
| CN111303643A (en) * | 2020-02-22 | 2020-06-19 | 西南石油大学 | SiO of core-shell structure2@ paraffin nanoparticle and preparation method thereof |
| US20210017827A1 (en) * | 2019-07-17 | 2021-01-21 | Saudi Arabian Oil Company | Targeted Downhole Delivery |
-
2021
- 2021-02-24 CN CN202110208587.5A patent/CN112780219A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1348761A (en) * | 2001-10-26 | 2002-05-15 | 四川大学 | Targeting controlled-release microcapsule capable of inducing environment information quickly |
| US20090192053A1 (en) * | 2004-05-13 | 2009-07-30 | Baker Hughes Incorporated | Methods and Compositions for Delayed Release of Chemicals and Particles |
| CN102108293A (en) * | 2009-12-23 | 2011-06-29 | 中国石油天然气股份有限公司 | Preparation method of slow-release rubber breaking agent for chemical temporary-plugging rubber plug |
| US20130056215A1 (en) * | 2011-09-07 | 2013-03-07 | Baker Hughes Incorporated | Disintegrative Particles to Release Agglomeration Agent for Water Shut-Off Downhole |
| CN102627954A (en) * | 2012-03-26 | 2012-08-08 | 扬州大学 | Sodium persulfate microcapsule capable of controllable concentrated release at fixed time and preparation method thereof |
| US20150210824A1 (en) * | 2014-01-24 | 2015-07-30 | Baker Hughes Incorporated | Nanocomposite microgels, methods of manufacture, and uses thereof |
| CN105169398A (en) * | 2014-06-12 | 2015-12-23 | 华东理工大学 | Meso-porous silicon oxide nanoparticle-based controlled release system and preparation method thereof |
| US20180298274A1 (en) * | 2015-04-30 | 2018-10-18 | Johnson Matthey Public Limited Company | Oil field chemical delivery fluids, methods for their use in the targeted delivery of oil field chemicals to subterranean hydrocarbon reservoirs and methods for tracing fluid flow |
| CN106281267A (en) * | 2016-07-26 | 2017-01-04 | 中国石油天然气股份有限公司 | A kind of pH value quick gel water-plugging profile control agent |
| CN108187066A (en) * | 2017-12-29 | 2018-06-22 | 中国药科大学 | A kind of nano-carrier for realizing drug controlled release and preparation method thereof |
| CN108503744A (en) * | 2018-03-28 | 2018-09-07 | 中国石油大学(华东) | Acrylic emulsion and its preparation method and application with nucleocapsid |
| CN110157401A (en) * | 2019-05-06 | 2019-08-23 | 中国石油天然气股份有限公司 | A kind of preparation method of controllable long-acting slow-release scale inhibition agent capsules |
| US20210017827A1 (en) * | 2019-07-17 | 2021-01-21 | Saudi Arabian Oil Company | Targeted Downhole Delivery |
| CN111303643A (en) * | 2020-02-22 | 2020-06-19 | 西南石油大学 | SiO of core-shell structure2@ paraffin nanoparticle and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 张子路: "N,N-二乙基丙烯酰胺与N,N-二甲基丙烯酰胺嵌段共聚物的可控合成及温敏性研究", 《高分子学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115678521A (en) * | 2022-11-03 | 2023-02-03 | 西南石油大学 | Temporary plugging agent for reservoir protection and preparation method thereof |
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