CN109505574B - Combustible plugging process for flooding and fireflooding oil reservoir by heavy oil emulsification method - Google Patents
Combustible plugging process for flooding and fireflooding oil reservoir by heavy oil emulsification method Download PDFInfo
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- CN109505574B CN109505574B CN201910014221.7A CN201910014221A CN109505574B CN 109505574 B CN109505574 B CN 109505574B CN 201910014221 A CN201910014221 A CN 201910014221A CN 109505574 B CN109505574 B CN 109505574B
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- oil
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- heavy oil
- flooding
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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
- 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
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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
Abstract
The invention discloses a combustible plugging process for a water flooding fire flooding oil reservoir by an emulsified heavy oil method. The process comprises the following steps: 1) preparing an oil-in-water emulsion with the solid content of 5-10% by using heavy oil, an oil-in-water emulsifier and water; 2) adding a combustion-supporting channeling sealing agent into the oil-in-water emulsion obtained in the step 1), and uniformly mixing for later use; 3) injecting the mixed solution obtained in the step 2) into the stratum by using injection equipment; 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. The principle of the invention is as follows: after the oil-in-water heavy oil emulsion enters the oil layer, the oil-in-water heavy oil emulsion has a certain plugging and channeling-preventing effect on the stratum, and after the oil layer is ignited, the heavy oil can be used as fuel for supplementary combustion. And an oxidation combustion improver and a foaming agent can be supplemented subsequently, so that the effects of combustion supporting and channeling prevention are assisted, and pollution-free uniform fireflooding is realized.
Description
Technical Field
The invention belongs to the field of oil field application. In particular to a combustible plugging process for a water flooding fire flooding oil reservoir by an emulsified heavy oil 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 heavy oil 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 95-100%) 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 heavy oil method comprises the following steps:
1) the heavy oil, the oil-in-water emulsifier and the water are used for preparing the oil-in-water emulsion with the solid content of 5-10 percent. The process belongs to the mature technology, and the invention is not detailed here. The solids content is selected in particular according to the well conditions.
The heavy oil is residual heavy oil obtained after gasoline and diesel oil are extracted from crude oil, and is prepared by blending normal pressure oil, vacuum residue oil, cracked diesel oil, catalytic diesel oil and the like which are used as raw materials in the crude oil processing process. Its advantages are high molecular weight and viscosity. The specific gravity of the heavy oil is generally 0.82-0.95, and the specific heat is 10,000-11,000 kcal/kg. The main component of the sulfur-containing additive is hydrocarbon, and the sulfur-containing additive contains partial (about 0.1-4%) sulfur and trace inorganic compounds.
2) Adding a combustion-supporting channeling sealing agent into the oil-in-water emulsion obtained in the step 1), and uniformly mixing for later use.
3) Injecting the mixed liquid obtained in the step 2) into the stratum by using injection equipment.
Preferably, the injection amount is 500-2000 tons; more preferably, the injection amount is 2000 tons.
4) Air displacement brings the wellbore fluid level to the lower reservoir boundary.
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 is seriously lacked, the oil saturation is low (the water content is 95-100 percent), and the gas channeling risk exists. The principle of the invention is as follows: after the oil-in-water heavy oil emulsion enters the oil layer, the oil-in-water heavy oil emulsion has a certain plugging and channeling-preventing effect on the stratum, and after the oil layer is ignited, the heavy oil can be used as fuel for supplementary combustion. And an oxidation combustion improver and a foaming agent can be supplemented subsequently, so that the effects of combustion supporting and channeling prevention are assisted, and pollution-free uniform fireflooding is realized.
Preferably, the oil-in-water emulsifier is OP-15 or the like.
Preferably, the mass ratio of the combustion-supporting channeling sealing agent to the oil-in-water emulsion in the step 1) is 1: 1.
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 nitrate; adding water to obtain 0.1-0.5% solution. Wherein, dodecyl dimethyl betaine and k-12 dodecyl sodium sulfate are used as foaming agents, and ammonium nitrate 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 nitrate; adding water to obtain 0.1-0.5% 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 a certain oil field fire flooding is injected into a well, the huff and puff takes 29 turns, the well is flooded with water, the water content is 100 percent, and the data shows that the oil saturation of the steam huff and puff range is low. For smooth ignition, the following process is implemented:
1. an electric ignition tool is programmed.
2. Selecting 100 tons of heavy oil, and emulsifying with OP-15 to obtain 1000 tons of emulsion for later use.
3. Preparing 1000 tons of 0.5 percent combustion-supporting channeling-sealing agent, and mixing the combustion-supporting channeling-sealing agent with the emulsion.
4. The mixture was injected into the formation with an injection device at about 2000 tons. The injection pressure is 5.0-8.2MPa, and the injection speed is 15m3/h。
5. Displacement was performed with 15000 standard square air, well bore level to lower reservoir boundary and 10000 standard square excess. Gas injection rate 18091Nm3And d, gas injection pressure 9.0 MPa. And 25000 standard squares.
6. And starting the electric ignition device to start a normal ignition process. The designed ignition temperature of the well is more than 450 ℃, the maximum implementation power is 95KW, the actual ignition temperature is 496 ℃, and the ignition is carried out for 17 daysGas injection rate 15932Nm3D, gas injection pressure is 9.5-8.8-9.0 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 (6)
1. A combustible plugging process for a water flooding fire flooding oil reservoir by an emulsified heavy oil method is characterized by comprising the following steps:
1) preparing an oil-in-water emulsion with the solid content of 5-10% by using heavy oil, an oil-in-water emulsifier and water;
2) adding a combustion-supporting channeling sealing agent into the oil-in-water emulsion obtained in the step 1), and uniformly mixing for later use;
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 nitrate; adding water to prepare 0.1-0.5% solution;
3) injecting the mixed solution obtained by mixing the oil-in-water emulsion and the combustion-supporting channeling sealing agent in the step 2) into the stratum by using injection equipment;
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 the oil-in-water emulsifier is OP-15.
3. The emulsified heavy oil flooding oil reservoir combustible plugging process according to claim 1, wherein the mass ratio of the combustion-supporting channeling-sealing agent to the oil-in-water emulsion in the step 1) is 1: 1.
4. The emulsification heavy oil method water-flooded fire flooding reservoir combustible plugging process of 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 nitrate; adding water to obtain 0.1-0.5% solution.
5. The process for combustible plugging of a water flooded fire flooding reservoir by an emulsified heavy oil method as claimed in claim 1, wherein the injection amount of the mixed liquid in the step 3) is 500-2000 tons.
6. The process for combustible plugging of a water flooded fire flooding reservoir by an emulsified heavy oil method according to claim 1, wherein the injection amount of the mixed liquor in the step 3) is 2000 tons.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910014221.7A CN109505574B (en) | 2019-01-08 | 2019-01-08 | Combustible plugging process for flooding and fireflooding oil reservoir by heavy oil emulsification method |
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| CN201910014221.7A CN109505574B (en) | 2019-01-08 | 2019-01-08 | Combustible plugging process for flooding and fireflooding oil reservoir by heavy oil emulsification method |
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| US9428683B2 (en) * | 2013-03-14 | 2016-08-30 | Flotek Chemistry, Llc | Methods and compositions for stimulating the production of hydrocarbons from subterranean formations |
| CN103939068A (en) * | 2014-04-16 | 2014-07-23 | 东北石油大学 | Method for exploiting thickened oil or asphalt |
| 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 |
| 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 |
| CN107100604B (en) * | 2017-03-16 | 2019-09-10 | 中国石油天然气股份有限公司 | A method of it is lighted a fire using nano combustion improver and carries out combustion in situ exploitation |
| CN108119092A (en) * | 2017-12-01 | 2018-06-05 | 中国石油天然气股份有限公司 | A kind of watered out reservoirs fireflood producing well selectively envelope alters agent and its application |
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