CN109536151B - Solution type combustion-supporting channeling sealing agent for fireflooding oil reservoir - Google Patents
Solution type combustion-supporting channeling sealing agent for fireflooding oil reservoir Download PDFInfo
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- CN109536151B CN109536151B CN201910014223.6A CN201910014223A CN109536151B CN 109536151 B CN109536151 B CN 109536151B CN 201910014223 A CN201910014223 A CN 201910014223A CN 109536151 B CN109536151 B CN 109536151B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/592—Compositions used in combination with generated heat, e.g. by steam injection
Abstract
The invention discloses a solution type combustion-supporting channeling-sealing agent for a fireflood reservoir. The solution type combustion-supporting channeling-sealing agent for the fireflooding oil reservoir is an aqueous solution with the concentration of 1% -100%, and comprises a foaming agent and a combustion improver. In a preferred scheme of the invention, the solution type combustion-supporting channeling-sealing agent for the fireflood reservoir comprises the following components: 40-50 wt% of dodecyl dimethyl betaine, 40-50 wt% of k-12 lauryl sodium sulfate and 10-20 wt% of ammonium persulfate. The solution type combustion-supporting channeling-sealing agent for the fireflood reservoir is suitable for heavy oil blocks and is used for preparing injection wells which are subjected to fireflood and have gas channeling risks. The solution type fire flooding oil reservoir combustion-supporting channeling sealing agent is used for channeling sealing and profile control, so that a fire line can be uniformly and stably pushed, and the fire line can be fully combusted.
Description
Technical Field
The invention belongs to the field of oil field application. In particular to a solution type combustion-supporting channeling-sealing agent for a fire flooding oil reservoir.
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 solution type combustion-supporting channeling-sealing agent for a fireflood reservoir, which is suitable for a heavy oil block and is used for preparing an injection well which is fireflood but has a gas channeling risk. The solution type fireflood reservoir combustion-supporting profile control agent disclosed by the invention is used for carrying out channeling sealing and profile control, so that a fire line can be uniformly and stably propelled, and the combustion is sufficient.
In order to achieve the purpose, the invention adopts the following technical scheme:
the solution type combustion-supporting channeling-sealing agent for the fire flooding oil reservoir is an aqueous solution with the concentration of 1% -100%, and comprises a foaming agent and a combustion improver. Wherein, the product stock solution with the concentration of 100 percent is not diluted by adding water.
In consideration of the field requirement and other chemicals used in combination, the concentration of the aqueous solution is preferably 5 to 20% in consideration of economy.
The solution concentration is determined according to the water content of the stratum, and the higher the water content, the higher the concentration is used.
Preferably, the mass ratio of the foaming agent to the combustion improver is (80-90): (10-20).
Preferably, the foaming agent includes, but is not limited to, one or a combination of several of fatty alcohol polyoxyethylene ether sulfonate, alkyl betaine, alkyl amide betaine, sulfopropyl betaine, phosphate betaine, fluorocarbon surfactant, sodium alkyl benzene sulfonate, sodium alkyl sulfate, alkanolamide and the like. The channeling is implemented through the Jamin effect of the foaming agent, and the combustion improver is assisted to ensure the full combustion.
Preferably, the combustion improver comprises one or a combination of more than one of readily water-soluble oxidants such as ammonium persulfate, calcium ammonium nitrate, potassium permanganate and potassium perchlorate, and the combustion improver catalyzes a combustion reaction to ensure sufficient combustion.
In a preferred scheme of the invention, the solution type fire flooding reservoir combustion-supporting channeling-sealing agent comprises: 40-50 wt% of dodecyl dimethyl betaine, 40-50 wt% of k-12 lauryl sodium sulfate and 10-20 wt% of ammonium persulfate.
Preferably, the usage amount of the solution type fire flooding oil reservoir combustion-supporting channeling-sealing agent is 10-10000. The specific usage amount is determined by considering a plurality of conditions such as well conditions used on site.
The invention is primarily directed to thick oil blocks, preparing injection wells for fireflooding but at risk of gas channeling. The channeling is implemented through the Jamin effect of the foaming agent, and the combustion improver is assisted to ensure the full combustion. The combustion-supporting channeling sealing agent can be used independently, and can also be matched with other profile control agents for slug construction.
Compared with the prior art, the invention has the following beneficial effects:
(1) the foam channeling sealing agent has less residue and does not pollute oil layers.
(2) Adding combustion improver to burn fully.
(3) The preparation is convenient and the operation is simple.
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:
this embodiment is accomplished by incorporating other flammable plugging agents as the first plug.
In a fire flooding injection well of an oil layer of a building, a 14-layer small layer of 10 meters is newly jetted, flooding is performed, a well is washed without oil, and the risk of gas channeling exists according to the information of adjacent wells. For smooth ignition, the following process is implemented:
1. an electric ignition tool is programmed.
2. Combustion-supporting channeling sealing agent: 40% of dodecyl dimethyl betaine, 40% of k-12 lauryl sodium sulfate, 20% of ammonium persulfate, and the weight percentage is industrial grade. Clean water is used for preparing a 10% solution, and the first section plug is injected into the 208 square. The injection pressure is 0.5MPa, and the injection speed is 30m3/h。
3. And washing the combustion-supporting channeling sealing agent containing tank with clean water, and continuously injecting washing liquid serving as a second slug into the stratum 180. The injection pressure is 0.8MPa, and the injection speed is 30m3/h。
4. Combustible blocking agent: 80 tons of dilute crude oil with the viscosity of 56MPa.s, 19 tons of common flour sold in the market and 1 ton of calcium peroxide. Slowly adding commercially available common flour and calcium peroxide in sequence, stirring, and injecting as a third plug. The injection pressure is increased from 0.8MPa to 3.6MPa, and the injection speed is 15m3/h。
5. And injecting 25-square commercial water-based industrial oil stain cleaning agent as a fourth slug to clean the shaft. The injection pressure is 3.5MPa, and the injection speed is 10m3/h。
6. Air displacement: 15000 standard square air was last replaced as a fifth slug. Gas injection rate 9138Nm3And d, gas injection pressure of 5.5 MPa.
7. 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 93KW, the actual ignition temperature is 461 ℃, the ignition is 15 days, and the gas injection speed is 19720Nm3D, gas injection pressure 6.0-5.5-5.8 MPa. The trend of descending first and then ascending is presented, the combustible profile control agent participates in the combustion section, the pressure is reduced to some extent, and the pressure is increased to some extent along with the increase of the gas injection quantity in the later period.
8. 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 (1)
1. The solution type combustion-supporting channeling-sealing agent for the fireflooding oil reservoir is characterized by being an aqueous solution with the concentration of 10%, and comprising the following components: 40 wt% of dodecyl dimethyl betaine, 40 wt% of k-12 lauryl sodium sulfate and 20 wt% of ammonium persulfate;
the use steps of the solution type fireflood reservoir combustion-supporting channeling-sealing agent comprise:
inserting an electric ignition tool;
the first section plug is injected into the solution type fire flooding oil reservoir combustion-supporting channeling sealing agent 208; the injection pressure is 0.5MPa, and the injection speed is 30m3/h；
Washing the containing tank of the combustion-supporting channeling-sealing agent of the solution type fire flooding oil reservoir with clear water, and continuously injecting the washing liquid serving as a second slug into the 180-square stratum; the injection pressure is 0.8MPa, and the injection speed is 30m3/h；
Injecting combustible plugging agents into the third plug, wherein the combustible plugging agents comprise 80 tons of dilute crude oil with the viscosity of 56MPa.s, 19 tons of common flour sold in the market and 1 ton of calcium peroxide; the injection pressure is increased from 0.8MPa to 3.6MPa, and the injection speed is 15m3/h；
Injecting 25-square commercially available water-based industrial oil stain cleaning agent into the fourth slug to clean the shaft; the injection pressure is 3.5MPa, and the injection speed is 10m3/h；
Injecting 15000 standard square air into the fifth slug for final replacement; gas injection rate 9138Nm3D, gas injection pressure is 5.5 MPa;
and starting the electric ignition device to start a normal ignition process.
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| CA2668389C (en) * | 2001-04-24 | 2012-08-14 | Shell Canada Limited | In situ recovery from a tar sands formation |
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| CN106223910B (en) * | 2016-08-01 | 2018-11-27 | 中嵘能源科技集团有限公司 | Air-injection displacement method is heated to oil reservoir air injection, oxygen-enriched oil-breaking power-up magnetic wave |
| 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 |
| CN108117864A (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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| WO2002086029A2 (en) * | 2001-04-24 | 2002-10-31 | Shell Oil Company | In situ recovery from a relatively low permeability formation containing heavy hydrocarbons |
| WO2002086018A2 (en) * | 2001-04-24 | 2002-10-31 | Shell Internationale Research Maatschappij B.V. | In situ recovery from a oil shale formation |
| CN105696990A (en) * | 2016-03-02 | 2016-06-22 | 中国石油天然气股份有限公司 | Profile control method for gas channeling passage of fireflooding gas-injection well and pipe column for profile control method |
| CN108166962A (en) * | 2018-01-24 | 2018-06-15 | 中国石油天然气股份有限公司 | A kind of communication method of fire flood air injection well and oil recovery producing well |
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