CN109594950B - Combustible plugging process for flooding and fireflooding oil reservoir by emulsified asphalt method - Google Patents
Combustible plugging process for flooding and fireflooding oil reservoir by emulsified asphalt method Download PDFInfo
- Publication number
- CN109594950B CN109594950B CN201910014159.1A CN201910014159A CN109594950B CN 109594950 B CN109594950 B CN 109594950B CN 201910014159 A CN201910014159 A CN 201910014159A CN 109594950 B CN109594950 B CN 109594950B
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- Prior art keywords
- combustion
- emulsified asphalt
- flooding
- solid content
- channeling
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Classifications
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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
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/243—Combustion in situ
Abstract
The invention discloses a combustible plugging process for a water flooding fire flooding oil reservoir by an emulsified asphalt method. The process comprises the following steps: 1) selecting the solid content of the emulsified asphalt to be 5-10% according to the solid content and well conditions of the emulsified asphalt, and then adding 1-2% of a combustion improver for later use; 2) injecting the mixed solution obtained in the step 1) into a stratum by using injection equipment; 3) then injecting combustion-supporting channeling-sealing agent; 4) displacing air to the liquid level of the shaft to the lower boundary of an oil layer; 5) and starting the electric ignition device to start an ignition process. The principle of the invention is as follows: emulsified asphalt firstly enters the deep part of an oil layer, has a certain plugging and channeling-preventing function on the stratum, and can be used as fuel for supplementary combustion after the oil layer is ignited. The subsequent oxidation combustion improver and the foaming agent can also play a role in supporting combustion and preventing channeling, and realize pollution-free uniform fireflooding. The combustible plugging process is suitable for flooding heavy oil reservoirs, and a huff-puff fireflood injection well with low oil saturation (water content of 95-98%) in a near-wellbore zone can be used for uniformly igniting and fully combusting.
Description
Technical Field
The invention belongs to the field of oil field application. In particular to a combustible plugging process of a water flooding fire flooding oil reservoir by an emulsified asphalt method.
Background
The fire flooding is to use heavy components in the crude oil of the stratum as fuel, use air or oxygen-enriched gas as combustion improver, adopt methods such as spontaneous combustion and manual ignition to enable the temperature of an oil layer to reach the ignition point of the crude oil, continuously inject the combustion improver into the oil layer to enable the crude oil of the oil layer to be continuously combusted, generate a large amount of heat through combustion reaction, heat the oil layer to enable the temperature of the oil layer to rise to 600-700 ℃, crack the heavy components at high temperature, and use the injected gas, light oil generated by cracking of heavy oil, gas generated by combustion and steam to drive the crude oil to flow to a production well and be extracted from the production well.
The oil extraction in-situ combustion has the major defects that the air is seriously overflowed, the upper part has large using degree, and when the oil is extracted to a certain degree, gas channeling can be caused, and particularly, the oil reservoir is developed, and the gas channeling degree is larger.
The current common ignition process causes uneven location utilization of the ignition layer, coking waste is generated in an oil layer which is not suitable for fireflooding, the resources which can be subsequently developed are greatly reduced, and the problem of coking waste is particularly serious for a heavy oil reservoir which is developed by steam huff and puff.
The technology for sealing channeling of heavy oil wells mainly comprises the types of conventional granular plugging agents such as cement and the like, high-temperature organic gel, thermosetting resin, gel granular plugging agents, foam plugging agents and the like. The conventional granular plugging agents such as cement have the defects of large particle size, no selectivity, easy reservoir damage and the like; the price of the high-temperature organic jelly is higher; the thermosetting resin has no selectivity, the curing speed is very sensitive to the temperature, and the controllability is poor; the gel particle plugging agent cannot be injected into the deep part of the stratum; the plugging strength of the foam water plugging agent is too low, and the stratum adaptability is poor.
Patent 201510909656.X discloses a fireflood channeling sealing agent and a preparation method thereof; patent 201410592158.2 discloses an in-situ combustion ignition method and apparatus; patent 201410592160.X discloses a combustion-supporting ignition method for in-situ combustion; patent 201510887763.7 discloses an oil well profile control agent and its preparation and application; patent 201611253606.1 discloses a sulfur-fixing combustion-supporting high-temperature profile control agent, a preparation method and application thereof; patent 201610617729.2 discloses an apparatus for injecting pulverized coal into an oil reservoir and a method of igniting an in-situ combustion; patent 201410592183.0 discloses a method and apparatus for profile control and channeling sealing in oil production; patent 201610116728.X discloses a profile control method for gas channeling channel of fireflood gas injection well and its pipe column; patent 201510887763.7 discloses an oil well profile control agent and its preparation and application; patent 201610454433.3 discloses a method for in situ combustion air foam profile control; experimental study on profile control and temporary plugging mechanism of thickened oil fireflood, inner Mongolia petrochemical industry, 1006-; a chemical regulation and control technology for a fire flooding injection and production well of a heavy oil reservoir, namely, a special oil and gas reservoir, 2016,23(5) 122-; research on the fire flooding development dynamic regulation and control technology of thin interbed heavy oil reservoirs, chemical engineering management 2014(20) 118-.
In the profile control method for the fire flooding oil reservoir mentioned in the patent and the article, the used profile control channeling sealing agent cannot be combusted, so that the problem of stratum pollution in different degrees exists, effective resources are wasted, and the improvement of the final recovery ratio is influenced.
Disclosure of Invention
In order to solve the technical problem, the invention provides a combustible plugging process for a water-flooded fire flooding oil reservoir by an emulsified asphalt method, which is suitable for flooding a heavy oil reservoir, and a huff-puff fire flooding injection well with low oil saturation (water content of 95-98%) in a near-wellbore region is used for uniformly igniting and fully combusting.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combustible plugging process for a water flooding fire flooding oil reservoir by an emulsified asphalt method comprises the following steps:
1) according to the solid content and well condition of the emulsified asphalt, the solid content of the emulsified asphalt is selected to be 5-10%, and then 1-2% of combustion improver is added for standby.
The invention selects the commercial emulsified asphalt. The emulsified asphalt is road asphalt used at high temperature, and is dispersed into water by mechanical stirring and chemical stabilization (emulsification) to liquefy into a road building material with low viscosity and good fluidity at normal temperature.
2) Injecting the mixed solution obtained in the step 1) into a stratum by using injection equipment; preferably, the injection amount is 100-200 tons.
3) Then injecting combustion-supporting channeling-sealing agent; preferably, the injection amount of the combustion-supporting channeling sealing agent is 50-100 square.
4) The air is displaced to the liquid level of the shaft to the lower boundary of the oil layer.
5) And starting the electric ignition device to start an ignition process.
The invention mainly aims at an injection well which is used for handling and transferring fire flooding to ensure that ignition is uniform and combustion is sufficient and the ignition success rate is improved when a steam handling block in multiple rounds is flooded with water, the stratum depletion is serious, the oil saturation is low (the water content is 95-98 percent), and the gas channeling risk exists. The principle of the invention is as follows: emulsified asphalt firstly enters the deep part of an oil layer, has a certain plugging and channeling-preventing function on the stratum, and can be used as fuel for supplementary combustion after the oil layer is ignited. The subsequent oxidation combustion improver and the foaming agent can also play a role in supporting combustion and preventing channeling, and realize pollution-free uniform fireflooding.
Preferably, the combustion improver comprises one or more of oxidizing agents such as calcium peroxide, ammonium persulfate, calcium ammonium nitrate, potassium permanganate, potassium perchlorate and manganese dioxide.
Preferably, when the solid content of the emulsified asphalt is higher than the selected use solid content, water is added to dilute the emulsified asphalt to the selected use solid content.
Preferably, the combustion-supporting channeling sealing agent is prepared by the following method: 40-50 wt% of dodecyl dimethyl betaine, 40-50 wt% of k-12 lauryl sodium sulfate and 10-20 wt% of ammonium persulfate; adding water to prepare a 1-5% solution. Wherein, dodecyl dimethyl betaine and k-12 dodecyl sodium sulfate are used as foaming agents, and ammonium persulfate is used as combustion improver.
In a preferred embodiment of the invention, the combustion-supporting channeling sealing agent is prepared by the following method: 40 wt% of dodecyl dimethyl betaine, 40 wt% of k-12 lauryl sodium sulfate and 20 wt% of ammonium persulfate; adding water to prepare a 1-5% solution.
Compared with the prior art, the invention has the following beneficial effects:
(1) the water-based blocking agent can enter the deep part of an oil layer.
(2) Adding combustion improver to burn fully.
(3) And (4) combustion-supporting plugging and double effects.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
Example 1:
when the fire flooding in a certain oil field is injected into a well, the huff and puff is performed for 21 times, the water is flooded, the water content is 96 percent, and the data shows that the oil saturation in the steam huff and puff range is low. For smooth ignition, the following process is implemented:
1. an electric ignition tool is programmed.
2. 150 tons of industrial emulsified asphalt with solid content of 5 percent is selected, and 2 tons of ammonium persulfate is mixed for standby.
3. And injecting the mixed solution into the stratum by using injection equipment. The injection pressure is 7.5MPa, and the injection speed is 15m3/h。
4. And then injecting 50 parts of combustion-supporting channeling sealing agent (40% of dodecyl dimethyl betaine, 40% of k-12 lauryl sodium sulfate, 20% of ammonium persulfate, the weight percentage of which is 2% of solution prepared by industrial grade and clear water). The injection pressure is 7.0MPa, and the injection speed is 15m3/h。
5. Displacing with 21500 square air to reach the wellbore level to the lower boundary of the oil reservoir. Gas injection rate 19809Nm3D, gas injection pressure 8.0 MPa.
6. And starting the electric ignition device to start a normal ignition process. The well is provided withThe ignition temperature is measured to be above 450 ℃, the maximum implementation power is 72KW, the actual ignition temperature is 518 ℃, the ignition is carried out for 14 days, and the gas injection speed is 15223Nm3D, gas injection pressure of 7.5-6.8-8.0 MPa. The pressure is in the trend of first decreasing and then increasing, the combustible profile control agent participates in the combustion section, the pressure is decreased to some extent, and the pressure is increased again along with the increase of the gas injection quantity in the later period.
The well is smoothly ignited, and gas channeling does not occur in the corresponding production well, so that the construction purpose is achieved.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (5)
1. A combustible plugging process for a water flooding fire flooding oil reservoir by an emulsified asphalt method is characterized by comprising the following steps:
1) selecting the solid content of the emulsified asphalt to be 5-10% according to the solid content and well conditions of the emulsified asphalt, and then adding 1-2% of a combustion improver for later use;
the combustion improver is one or a combination of more of calcium peroxide, ammonium persulfate, calcium ammonium nitrate, potassium permanganate, potassium perchlorate and manganese dioxide;
2) injecting the mixed solution obtained by mixing the emulsified asphalt and the combustion improver in the step 1) into the stratum by using injection equipment;
3) then injecting combustion-supporting channeling-sealing agent;
the combustion-supporting channeling sealing agent is prepared by the following method: 40-50 wt% of dodecyl dimethyl betaine, 40-50 wt% of k-12 lauryl sodium sulfate and 10-20 wt% of ammonium persulfate; adding water to prepare a 1-5% solution;
4) displacing the air to enable the liquid level of the shaft to reach the lower boundary of an oil layer;
5) and starting the electric ignition device to start an ignition process.
2. The process of claim 1, wherein when the solid content of the emulsified bitumen is higher than the selected solid content, the emulsified bitumen is diluted to the selected solid content.
3. The emulsified asphalt method water flooding fire flooding oil reservoir combustible plugging process according to claim 1, wherein the combustion-supporting channeling-sealing agent is prepared by the following method: 40 wt% of dodecyl dimethyl betaine, 40 wt% of k-12 lauryl sodium sulfate and 20 wt% of ammonium persulfate; adding water to prepare a 1-5% solution.
4. The process for combustible plugging of a flooding oil reservoir by emulsified asphalt method according to claim 1, wherein the injection amount of the mixed solution in the step 2) is 100-200 tons.
5. The process for combustible plugging of a waterflooding-fire flooding oil reservoir by an emulsified asphalt method according to claim 1, wherein the injection amount of the combustion-supporting channeling sealing agent is 50-100 square.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910014159.1A CN109594950B (en) | 2019-01-08 | 2019-01-08 | Combustible plugging process for flooding and fireflooding oil reservoir by emulsified asphalt method |
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| CN201910014159.1A CN109594950B (en) | 2019-01-08 | 2019-01-08 | Combustible plugging process for flooding and fireflooding oil reservoir by emulsified asphalt method |
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| CN109594950A CN109594950A (en) | 2019-04-09 |
| CN109594950B true CN109594950B (en) | 2021-08-03 |
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| CN114075432B (en) * | 2020-08-20 | 2023-04-28 | 中国石油化工股份有限公司 | Deep plugging control system and steam steering method for thickened oil thermal recovery well |
| CN117868767A (en) * | 2024-03-13 | 2024-04-12 | 中国石油大学(华东) | Method for improving recovery ratio of thickened oil by utilizing flue gas to form gel |
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| CN102071918A (en) * | 2010-12-22 | 2011-05-25 | 中国石油天然气集团公司 | Thick oil reservoir fire flooding oil extraction combustion-supporting ignition method |
| CN104453817B (en) * | 2014-10-29 | 2017-02-15 | 中国石油天然气股份有限公司 | In-situ combustion combustion-supporting ignition method |
| TW201707778A (en) * | 2015-05-21 | 2017-03-01 | 盧伯利索先進材料有限公司 | Emulsion composition for energy curable ink compositions and a printing process and method thereof |
| CN105696990B (en) * | 2016-03-02 | 2018-02-02 | 中国石油天然气股份有限公司 | To the profile control method and its tubing string of the has channeling passage of fireflood gas injection well |
| CN107882531B (en) * | 2017-12-01 | 2020-10-09 | 中国石油天然气股份有限公司 | Selective water control channeling sealing method for flooding production well of water-flooded oil reservoir |
| CN109081765B (en) * | 2018-09-19 | 2021-12-07 | 西安石油大学 | Chemical auxiliary ignition agent and ignition method for low-temperature heavy oil reservoir |
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