CN109826604B - Combustion-supporting channeling sealing method for fireflooding reservoir - Google Patents
Combustion-supporting channeling sealing method for fireflooding reservoir Download PDFInfo
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Abstract
The invention discloses a combustion-supporting channeling sealing method for a fire flooding oil reservoir. Injecting a combustion-supporting channeling sealing agent into an injection well to support combustion and channeling sealing; the combustion-supporting channeling sealing agent comprises a foaming agent and a combustion improver. The combustion-supporting channeling sealing agent is a solution type combustion-supporting channeling sealing agent or a turbid liquid type combustion-supporting channeling sealing agent; can be used independently, and can also be matched with other profile control agents for slug construction. The combustion-supporting channeling sealing method is suitable for thick oil blocks, the water content is relatively low by 90-95%, the oil saturation is relatively high, a certain deficit exists near a well, and an injection well which is subjected to fireflooding and has a gas channeling risk is prepared; the invention can inject combustion-supporting channeling sealing agent by a certain process to ensure that the fire wire is evenly and stably propelled and the combustion is sufficient.
Description
Technical Field
The invention belongs to the field of oil field application. In particular to a combustion-supporting channeling-sealing method 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 combustion-supporting channeling sealing method for a fireflood reservoir, which is suitable for a heavy oil block, has relatively low water content of 90-95 percent and relatively high oil saturation, has a certain deficit in a near-well area, and prepares an injection well which is fireflood but has a gas channeling risk; the invention can inject combustion-supporting channeling sealing agent by a certain process to ensure that the fire wire is evenly and stably propelled and the combustion is sufficient.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combustion-supporting channeling sealing method for a fireflooding reservoir comprises the steps of injecting a combustion-supporting channeling sealing agent into an injection well to support combustion and channeling sealing; the combustion-supporting channeling sealing agent comprises a foaming agent and a combustion improver.
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 more of, but not limited to, calcium peroxide, ammonium persulfate, calcium ammonium nitrate, potassium permanganate, potassium perchlorate, manganese dioxide and other oxidants. The combustion improver catalyzes a combustion reaction, so that the combustion is sufficient.
Further preferably, the combustion-supporting channeling-sealing agent is a solution-type combustion-supporting channeling-sealing agent or a turbid-liquid-type combustion-supporting channeling-sealing agent.
In a preferred scheme of the invention, the solution type combustion-supporting channeling-sealing agent is prepared by the following formula (mainly used for injection wells containing 95-98% of water or matched with other combustible plugging agents): 40-50 wt% of dodecyl dimethyl betaine, 40-50 wt% of k-12 lauryl sodium sulfate, 10-20 wt% of ammonium persulfate and clear water, wherein the concentration of the solution is 1% -100%, and the using amount is 10-10000. 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. When the concentration is 100%, the prepared solution type combustion-supporting channeling sealing agent is used, and water is not added for dilution.
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.
Preferably, the usage amount of the solution type combustion-supporting channeling-sealing agent is 10-10000. The specific amount of the agent to be used is determined according to conditions such as well conditions at the time of actual construction and chemicals to be used in combination.
In another preferable scheme of the invention, the turbid liquid type combustion-supporting channeling-sealing agent is prepared by the following formula (mainly used for an injection well with water content of more than 98%): 30-40 wt% of dodecyl dimethyl betaine, 30-40 wt% of k-12 lauryl sodium sulfate, 10-20 wt% of calcium peroxide, 1-5 wt% of coke powder with the particle size of more than 200 meshes, 0.01-0.05 wt% of thickening agent, and clear water, wherein the calcium peroxide and the coke are both insoluble in water to form a turbid solution, and the concentration of the turbid solution is 1-100%. Similarly, the specific concentration of the turbid liquid is determined according to specific construction well conditions, wherein when the concentration is 100%, water is not added for dilution. The thickening agent can be added in small amount, and can be common industrial thickening agent, such as sodium carboxymethylcellulose (CMC), polyacrylamide, etc.
In consideration of the field requirements and other chemicals used in combination, the concentration of the turbid liquid is preferably 5 to 20% in consideration of economy. The concentration of the turbid liquid type combustion-supporting channeling-sealing agent is 5-20%.
Preferably, the using amount of the turbid liquid type combustion-supporting channeling-sealing agent is 100-10000 square. The specific amount of the agent to be used is determined according to conditions such as well conditions at the time of actual construction and chemicals to be used in combination.
The combustion-supporting channeling sealing agent can be used independently, and can also be matched with other profile control agents for slug construction.
The method mainly aims at the injection well which is prepared for fireflooding but has a gas channeling risk, especially the injection well prepared for fireflooding with a steam channeling history, and the addition amount of specific foaming agents, combustion improvers and combustible organic matters and the profile control process are adjusted according to specific well mines after steam huff and puff for multiple rounds of steam; several scenarios are provided in embodiments of the present invention.
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:
a certain well of an oil field and a 28 m/2 layer contain 99 percent of water after 21 times of steam huffing and puff, the later-stage stratum has insufficient energy and no huffing and puff value, and the well is converted into a fire flooding injection well and has a gas channeling risk according to the previous information. For smooth ignition, the following process is implemented:
1. an electric ignition tool is programmed.
2. Turbid liquid type combustion-supporting channeling-sealing agent: 40% of dodecyl dimethyl betaine, 40% of k-12 lauryl sodium sulfate, 18% of calcium peroxide, 2% of coke powder sieved by a 200-mesh sieve, a small amount of thickening agent, and the weight percentage is industrial grade. Preparing a 5% uniform turbid solution 508 formula by using clear water on site. The injection pressure is 0.5-5.2MPa, and the injection speed is 25m3/h。
3. And washing the combustion-supporting channeling sealing agent preparation tank by using clean water, and continuously injecting the washing liquid into the stratum in a direction of 30. The injection pressure is 5.2MPa, and the injection speed is 15m3/h。
4. Replacing 10000 standard squares of air. Gas injection rate 8245Nm3And d, gas injection pressure of 6.2 MPa.
5. 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 89KW, the actual ignition temperature is not measured (the thermocouple is damaged), the well is ignited for 18 days, and the gas injection speed is 19138Nm3D, gas injection pressure 6.7 MPa.
6. The well is smoothly ignited, and gas channeling does not occur in the corresponding production well, so that the construction purpose is achieved.
Example 2:
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. Preparing 10% solution with clear water, injecting the first section plug into the solution in the direction of 208. 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 is 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 (2)
1. A combustion-supporting channeling sealing method for a fireflooding reservoir is characterized in that a combustion-supporting channeling sealing agent is injected into an injection well to carry out combustion-supporting channeling sealing; the combustion-supporting channeling sealing agent comprises a foaming agent and a combustion improver;
the foaming agent is dodecyl dimethyl betaine and k-12 lauryl sodium sulfate;
the combustion-supporting channeling sealing agent is a solution type combustion-supporting channeling sealing agent or a turbid liquid type combustion-supporting channeling sealing agent;
the solution type combustion-supporting channeling sealing agent comprises the following components in percentage by weight: 40-50 wt% of dodecyl dimethyl betaine, 40-50 wt% of k-12 lauryl sodium sulfate and 10-20 wt% of ammonium persulfate, and water is added to prepare a solution with the concentration of 5% -20%; the usage amount of the solution type combustion-supporting channeling sealing agent is 10-10000;
the turbid liquid type combustion-supporting channeling-sealing agent comprises the following components in percentage by weight: 30-40 wt% of dodecyl dimethyl betaine, 30-40 wt% of k-12 lauryl sodium sulfate, 10-20 wt% of calcium peroxide, 1-5 wt% of coke powder with more than 200 meshes, 0.01-0.05 wt% of thickening agent and water to prepare turbid liquid with the concentration of 5-20%; the using amount of the turbid liquid type combustion-supporting channeling-sealing agent is 100-10000 square.
2. The combustion-supporting channeling sealing method for the fireflood reservoir according to claim 1, wherein the thickening agent is sodium carboxymethylcellulose or polyacrylamide.
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