CN106050207A - Device for injecting pulverized coal into oil layer and ignition method for in-situ oil combustion - Google Patents
Device for injecting pulverized coal into oil layer and ignition method for in-situ oil combustion Download PDFInfo
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- CN106050207A CN106050207A CN201610617729.2A CN201610617729A CN106050207A CN 106050207 A CN106050207 A CN 106050207A CN 201610617729 A CN201610617729 A CN 201610617729A CN 106050207 A CN106050207 A CN 106050207A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 75
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000003245 coal Substances 0.000 title claims abstract description 52
- 238000002347 injection Methods 0.000 claims abstract description 71
- 239000007924 injection Substances 0.000 claims abstract description 71
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims abstract description 3
- 239000002817 coal dust Substances 0.000 claims description 170
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 73
- 239000007789 gas Substances 0.000 claims description 43
- 238000011049 filling Methods 0.000 claims description 39
- 229910052757 nitrogen Inorganic materials 0.000 claims description 30
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- 238000005243 fluidization Methods 0.000 claims description 22
- 230000005070 ripening Effects 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 230000003203 everyday effect Effects 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 10
- 238000011161 development Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 149
- 235000019198 oils Nutrition 0.000 description 147
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 14
- 239000010779 crude oil Substances 0.000 description 9
- 239000010410 layer Substances 0.000 description 9
- 239000000843 powder Substances 0.000 description 8
- 230000005465 channeling Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 239000007800 oxidant agent Substances 0.000 description 6
- 239000002671 adjuvant Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 238000010794 Cyclic Steam Stimulation Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000295 fuel oil Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241000772415 Neovison vison Species 0.000 description 1
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Abstract
The invention provides a device for injecting pulverized coal into an oil layer and an ignition method for in-situ oil combustion and belongs to the field of exploitation through in-situ oil combustion. The device for injecting the pulverized coal into the oil layer comprises an oil pipe arranged in an injection well or a production well, a pulverized coal spray-blowing system arranged on the ground and an injection pipeline, wherein the pulverized coal spray-blowing system is provided with a pulverized coal input port and a spray-blowing port, the spray-blowing port sprays out the pulverized coal, the injection pipeline is connected between the oil pipe and the spray-blowing port of the pulverized coal spray-blowing system, and the pulverized coal sprayed out of the spray-blowing port is delivered to the oil pipe. The device can improve the ignition effect for in-situ oil combustion and can also improve the development effect of the in-situ oil combustion.
Description
Technical field
The invention belongs to combustion in situ exploitation field, particularly relate to a kind of equipment injecting coal dust in oil reservoir and burn oil
The ignition method of layer.
Background technology
At present, how oil field at home improves recovery ratio for the factor of cyclic steam stimulation in heavy oil reservoir later stage, and often select is to turn to steam
The development schemes such as vapour drives, SAGD or combustion in situ.
Combustion in situ development approach, it mainly comprises the processes of and is continuously injected into combustion adjuvant (air) to oil reservoir, simultaneously from injection well
With underground flame lighter, oil reservoir is lighted (temperature being heated to crude oil energy spontaneous combustion) thus burns, make neighbouring oil evaporation and
Coking.Light oil steam with combustion front the most outwardly, until producing well and be plucked out of.The heavy hydrocarbon of coking then can continue combustion
Burn and heat is provided.
Owing to oil reservoir ignition temperature is up to 250～500 DEG C, make viscous crude, mink cell focus to drop glutinous, and in oil gas thermal expansion and
Edible vegetable oil dilution vapour displacement under mined.Use this method up to the highest recovery ratio 20%～80%.Implement Simulation on whole pay zones
Oil reservoir, in addition to being determined because its oil property is special, its geological conditions is also had certain requirement, i.e. core intersection will more greatly,
Buried depth wants more shallow (< 1500m), and porosity is greater than 25%, and such oil reservoir just can have preferable thermal recovery effect and warp
Ji effect.
But, combustion in situ, as a kind of Development of Viscous Crude Oil mode, is usually applied to untapped heavy crude reservoir abroad,
And domestic it is commonly applied to develop heavy crude reservoir.For external, the heavy crude reservoir of domestic application combustion in situ exploitation, oil
Hide physical property and the combustion in situ suitability and have the biggest gap, as oil saturation reduce even some place almost without oil,
Moisture content rises, permeability contrast becomes big etc., and when these frequently result in enforcement combustion in situ exploitation, ignition results is bad, live wire
Advance the uneven easily problem such as has channeling, the bad even low-temperature burning of oil reservoir combustion efficiency, leverage combustion in situ exploitation effect
Really.
Therefore, it is necessary to explore new method in terms of improving combustion in situ development effectiveness.The present inventor by for many years from
The experience of thing relevant industries and practice, propose a kind of equipment injecting coal dust in oil reservoir and the ignition method of combustion in situ, with
Overcome the defect of prior art.
Summary of the invention
It is an object of the invention to provide a kind of equipment injecting coal dust in oil reservoir and the ignition method of combustion in situ, to carry
The ignition results of high combustion in situ, improves the development effectiveness of combustion in situ.
For reaching above-mentioned purpose, the present invention proposes a kind of equipment injecting coal dust in oil reservoir, wherein, described equipment bag
Include:
Oil pipe, is arranged in injection well or producing well；
Coalblowing system, is located on ground, and described Coalblowing system has coal dust input port and winding-up mouth, by described
Coal dust is sprayed by winding-up mouth；
Filling line, is connected between the winding-up mouth of described oil pipe and described Coalblowing system, will be by described winding-up mouth
The coal dust of ejection is sent to described oil pipe.
The equipment injecting coal dust in oil reservoir as above, wherein, described Coalblowing system includes Pulverized Coal Bin, centre
Tank, winding-up tank and nitrogen gas conveying device, described Pulverized Coal Bin, described pans and described winding-up tank be arranged in series, and described coal dust is defeated
Entrance is located in described Pulverized Coal Bin, and described winding-up mouth is located on described winding-up tank, described nitrogen gas conveying device respectively with described coal
Powder cabin, pans are connected with winding-up tank, described nitrogen gas conveying device nitrogen after described Pulverized Coal Bin conveying fluidisation, described nitrogen
Gas conveyer device nitrogen after described pans and described winding-up tank carry fluidisation pressurization.
The equipment injecting coal dust in oil reservoir as above, wherein, offers mixing mouth, institute on described filling line
State mixing mouth to be connected with carrying compressed-air actuated air delivering pipeline.
The equipment injecting coal dust in oil reservoir as above, wherein, described equipment also includes:
Dispersing and dissolving tank, is located on ground, is used for dissolving profile control agent, described dispersing and dissolving tank and described Coalblowing system
Winding-up mouth be connected；
Ripening tank, is connected between described dispersing and dissolving tank and described filling line, is provided with agitator in described ripening tank；
Pump, is arranged on described filling line, and the mixed liquor in described ripening tank is pumped into described oil pipe.
The equipment injecting coal dust in oil reservoir as above, wherein, described equipment also includes:
Electric igniter, be arranged at described in inject into well, for lighting described oil reservoir and the described coal injected through described oil pipe
Powder.
The invention allows for the ignition method of a kind of combustion in situ, wherein, by injecting coal to oil reservoir as above
Coal dust is injected oil reservoir by the equipment of powder, and described method includes:
Step 100, before formally to oil layer ignition gas injection, injects air in advance in oil reservoir by injecting well, and monitors
The change of the moisture content of producing well；
Step 200, after the moisture content of described producing well drops to below 80%, while injecting air, by coal dust
Coal dust is sprayed into filling line by injection system, through described filling line, coal dust is transported to described injection well, and through oil pipe to described
Oil reservoir injects described coal dust；
Step 300, formally carries out gas injection of lighting a fire by described injection well to described oil reservoir.
The ignition method of combustion in situ as above, wherein, described step 200 includes:
Step 210, loads the described coal dust prepared in described Pulverized Coal Bin；
Step 220, the nitrogen after conveying fluidizes in described Pulverized Coal Bin；
Step 230, after the coal dust in described Pulverized Coal Bin is filled, after utilizing described fluidisation, described coal dust is delivered to by nitrogen
In pans；
Step 240, is delivered to the nitrogen after fluidisation pressurization in described pans, and utilizes the nitrogen after described fluidisation pressurization
Described coal dust is delivered in described winding-up tank by gas；
Step 250, is delivered to the nitrogen after fluidisation pressurization in described winding-up tank and utilizes described nitrogen to described winding-up
Tank pressurizes；
Step 260, utilizes described nitrogen the coal dust in described winding-up tank to be sprayed into described filling line, by described injection
Described coal dust is injected in described oil reservoir by pipeline and described oil pipe.
The ignition method of combustion in situ as above, wherein, also includes in described step 200:
Step 270, inputs the mixing mouth being located on described filling line by compressed air；
Step 280, makes described air and described coal dust mix at described mixing mouth, and utilizes coal described in described air driven
Powder is in described oil pipe injects described oil reservoir.
The ignition method of combustion in situ as above, wherein, described air is compressed air, the flow model of described air
Enclose for every day 2 × 104Cubic meter is to 25 × 104Cubic meter.
The ignition method of combustion in situ as above, wherein, the injection rate of described coal dust is 30g/m3Coal dust conveying gas
Body is to 40g/m3Coal dust conveying gas.
The ignition method of combustion in situ as above, wherein, described method also includes step 400, to described oil reservoir
In formal igniting gas injection process, intermittently inject described coal dust with air.
The ignition method of combustion in situ as above, wherein, described step 400 includes:
Step 410, controlling electric igniter temperature is preheating temperature, and makes described electric igniter keep described preheating temperature 1
It was to 2 days；
Step 420, injects air, institute by described filling line and described oil pipe through described injection well in described oil reservoir
State maximum day gas injection rate that the injection rate of air is design；
Step 430, is sprayed into described filling line by described Coalblowing system by coal dust；
Step 440, makes described coal dust and described air mix at the mixing mouth being located on described filling line, and utilizes institute
State coal dust described in air driven in described oil pipe injects described oil reservoir；
Step 450, steps up the temperature of described electric igniter, when temperature reaches 250 DEG C, stops the note of described coal dust
Enter；
Step 460, continues to improve the temperature of electric igniter, until lighting oil reservoir.
The ignition method of combustion in situ as above, wherein, described method includes step 500, before combustion in situ, to
Injection profile agent described injection well or described producing well are carried out high-temperature profile control process in described injection well or producing well, described
Profile control agent adds described coal dust.
The ignition method of combustion in situ as above, wherein, described step 500 includes:
Step 510, is sprayed into coal dust equipped with in the dispersing and dissolving tank of described profile control agent by described Coalblowing system；
Step 520, makes described coal dust enter in ripening tank by described dispersing and dissolving tank with described profile control agent；
Step 530, stirs the described coal dust in described ripening tank and described profile control agent, makes described coal dust and described profile control agent
It is mixed to form mixed liquor in described ripening tank；
Step 540, is delivered to described injection well or described producing well by described mixed liquor through described filling line by pump, and
In described oil pipe injects described oil reservoir.
Compared with prior art, the invention have the characteristics that and advantage:
The equipment injecting coal dust in oil reservoir of present invention proposition and the ignition method of combustion in situ, by injecting well to oil
Injecting coal dust in Ceng, these coal dusts injected can either absorb the moisture in a part of oil reservoir, reduces the moisture content of oil reservoir, thus
Improve the ignition results of combustion in situ；Again can be saturated for live wire progradation during later stage combustion in situ is especially advanced to oil-containing
There is provided the oxidizer needed for burning when spending almost nil oil reservoir, thus when combustion in situ is developed, promote uniformly pushing away of live wire
Enter, improve the ignition temperature of oil reservoir, it is to avoid has channeling, final raising oil reservoir combustion efficiency occur.The raising that the present invention proposes is burnt
The method of reservoir exploitation effect be not only applicable to the factor of cyclic steam stimulation in heavy oil reservoir later stage turn baked wheaten cake exploitation, be applied equally to untapped
Heavy crude reservoir burns exploitation and other type oil reservoir burns exploitation.
Accompanying drawing explanation
Accompanying drawing described here is only used for task of explanation rather than is intended to limit model disclosed by the invention by any way
Enclose.It addition, the shape of each parts in figure and proportional sizes etc. are only schematically, it is adapted to assist in the understanding of the present invention, and
It not shape and the proportional sizes specifically limiting each parts of the present invention.Those skilled in the art under the teachings of the present invention, can
To select various possible shape and proportional sizes to implement the present invention as the case may be.
Fig. 1 is that the present invention is for injecting the structural representation of equipment one embodiment of coal dust in oil reservoir；
Fig. 2 is that the present invention is for injecting the structural representation of the another embodiment of the equipment of coal dust in oil reservoir.
Description of reference numerals:
1-run coal bin；2-vibrosieve；3-sack cleaner；4-main exhaust fan；10-oil reservoir；20-injects well；30-oil pipe；
40-filling line；50-Coalblowing system；51-jets tank；511-jets mouth；52-pans；53-Pulverized Coal Bin；531-coal dust
Input port；Top, 54-storehouse dust arrester；55-transfer pipeline；60-pump；70-ripening tank；80-dispersing and dissolving tank.
Detailed description of the invention
In conjunction with accompanying drawing and the description of the specific embodiment of the invention, it is possible to clearly understand the details of the present invention.But
It is, the detailed description of the invention of invention described herein to be only used for explaining the purpose of the present invention, and can not understand by any way
One-tenth is limitation of the present invention.Under the teachings of the present invention, technical staff is it is contemplated that the most possible change of based on the present invention
Shape, these are regarded as belonging to the scope of the present invention.
Refer to Fig. 1, for the present invention for injecting the structural representation of equipment one embodiment of coal dust in oil reservoir；Such as figure
Shown in 1, the equipment injecting coal dust in oil reservoir that the present invention proposes, including oil pipe 30, filling line 40 and Coalblowing system
50, wherein, oil pipe 30 is arranged in injection well 20；Coalblowing system 50 is located on ground, and Coalblowing system 50 has coal
Powder input port 531 and winding-up mouth 511, sprayed coal dust by winding-up mouth 511；Filling line 40 is connected to oil pipe 30 and breeze blowing
Between the winding-up mouth 511 of system 50, winding-up mouth 511 coal dust sprayed is sent to oil pipe 30.
Utilize the above-mentioned equipment injecting coal dust in oil reservoir, in oil reservoir 10, inject coal dust by injecting well 20, these notes
The coal dust entered can either absorb the moisture in a part of oil reservoir 10, contributes to blocking height and oozes band, reduces the moisture content of oil reservoir, thus
Improve the ignition results of combustion in situ；Again can be saturated for live wire progradation during later stage combustion in situ is especially advanced to oil-containing
There is provided the oxidizer needed for burning when spending almost nil oil reservoir, thus when combustion in situ is developed, promote uniformly pushing away of live wire
Enter, improve the ignition temperature of oil reservoir, it is to avoid has channeling, final raising oil reservoir combustion efficiency occur.
In one optional example of the present invention, as shown in Figure 1 and Figure 2, Coalblowing system 50 include Pulverized Coal Bin 53, in
Between tank 52, winding-up tank 51 and nitrogen gas conveying device (being not shown), Pulverized Coal Bin 53, pans 52 and winding-up tank 51 are by defeated
Sending pipeline 55 to be arranged in series, coal dust input port 531 is located in Pulverized Coal Bin 53, and winding-up mouth 511 is located on winding-up tank 51, and nitrogen carries
Device is connected with Pulverized Coal Bin 53, pans 52 and winding-up tank 51 respectively, and this nitrogen gas conveying device is to Pulverized Coal Bin 53 conveying fluidisation
After nitrogen, meanwhile, this nitrogen gas conveying device also nitrogen after pans 52 and winding-up tank 51 conveying fluidisation pressurization.Through coal dust
The coal dust of injection system 50 ejection is easier to mix with air or profile control agent, and the distribution of coal dust is also in the mixture obtained
Evenly, therefore, after injecting oil reservoir, the distribution of coal dust is the most uniform.
In one optional example of the present invention, as it is shown in figure 1, offer mixing mouth 41, mixing on filling line 40
Mouth 41 is connected with carrying compressed-air actuated air delivering pipeline.
In one optional example of the present invention, as in figure 2 it is shown, the equipment injecting coal dust in oil reservoir that the present invention proposes
Also including dispersing and dissolving tank 80, ripening tank 70 and pump 60, wherein, dispersing and dissolving tank 80 is located on ground, is used for dissolving profile control
Agent, dispersing and dissolving tank 80 is connected with the winding-up mouth 511 of Coalblowing system 50；Ripening tank 70 is connected to dispersing and dissolving tank 80 He
Between filling line 40, in ripening tank 70, it is provided with agitator；Pump 60 is arranged on filling line 40, and pump 60 can be by ripening tank 70
Interior mixed liquor pumps into oil pipe 30 through filling line 40.
In one optional example of the present invention, the equipment injecting coal dust in oil reservoir that the present invention proposes also includes electricity point
Firearm (is not shown), and this electric igniter is arranged in injection well 20, is used for lighting oil reservoir 10 and being injected through oil pipe 30
Coal dust, it is achieved formally lighting a fire, owing to the burning-point of coal dust is relatively low relative to the burning-point of viscous crude, such coal dust just can first be lighted,
Thus as oxidizer, promote that the crude oil in oil reservoir realizes high-temp combustion earlier, finally can improve ignition success rate.
What the present invention proposed can also include run coal bin 1 for the equipment injecting coal dust in oil reservoir, former in run coal bin 1
Coal is transported in Pulverized Coal Bin 53 after vibrosieve 2 is sieved roguing and formed coal dust, run coal bin 1 is also provided with cloth bag and removes
Dirt device 3 and main exhaust fan 4.It is also possible to and arrange roof scrubber 54 on pans 52 in Pulverized Coal Bin 53.Bag-type dust
Device 3 and roof scrubber 54 all can lower dust concentration, it is to avoid the blast caused because of dust, it is ensured that safety in production.
The invention allows for the ignition method of a kind of combustion in situ, as it is shown in figure 1, inject coal dust by above-mentioned to oil reservoir
Equipment coal dust is injected oil reservoir, the method includes: before formal gas injection of lighting a fire oil reservoir 10, by injecting well 20 in advance to oil
Layer 10 injects air, and monitors the change of the moisture content of producing well；Step 200, when the moisture content of producing well drops to 80%
After below, while injecting air, Coalblowing system 50 coal dust is sprayed into filling line 40, through filling line 40 by coal
Powder is delivered to inject well 20, is injected in oil reservoir 10 by above-mentioned coal dust through oil pipe 30；Step 300, formal to oil by injecting well 20
Layer 10 carries out gas injection of lighting a fire.Wherein, coal dust injected slurry volume=3.14 × (a × heating radius)2× treat the thickness of combustion in situ ×
Porosity, a value 1.5～2, heat radiable scope during the heating of heating radius i.e. electric igniter；Inject in oil reservoir 10
The main purpose of air is to reduce the oil content of oil reservoir, and the injection rate of air depends on the feature of oil reservoir and crude oil, according to oil reservoir
The flow injecting air is determined with the practical situation of crude oil.In step 100, in oil reservoir 10, air is injected by injection well 20
After a period of time, producing well can monitor gas, continue afterwards to observe and the change of monitoring producing well moisture content.
Before combustion in situ is formally lighted a fire, in oil reservoir 10, inject coal dust by injecting well 20, these coal dusts injected
The moisture in a part of oil reservoir 10 can either be absorbed, contribute to blocking height and ooze band, reduce the moisture content of oil reservoir, thus improve baked wheaten cake
The ignition results of oil reservoir；Again can be for live wire progradation during later stage combustion in situ being especially advanced to oil saturation almost
Zero oil reservoir time the oxidizer needed for burning is provided, thus when combustion in situ develop, promote the uniform propelling of live wire, improve oily
The ignition temperature of layer, it is to avoid has channeling, final raising oil reservoir combustion efficiency occur.The ignition method of the combustion in situ that the present invention proposes
Be not only applicable to the factor of cyclic steam stimulation in heavy oil reservoir later stage turn baked wheaten cake exploitation, be applied equally to untapped heavy crude reservoir burn exploitation with
And the baked wheaten cake exploitation of other type of oil Tibetan.
Its injection coal dust of the ignition method of the combustion in situ that the present invention proposes is not intended to realize combustion-assistant ignition, and main
It is to alter to realize profile control envelope, and toward oil reservoir injecting certain coal dust as combustion adjuvant so that later stage oil deposit deep part baked wheaten cake leading edge
Burning seriality and effectively push.Igniting remains and realizes by electric igniter heating.
The ferrum coal dust injected in oil reservoir in prior art is the mixture of iron ore and coal dust, injects the main of ferrum coal dust
Purpose is first oil reservoir to be preheating to uniform temperature by electric heater, then takes out electric igniter, then with gas inject iron ore with
The mixture of coal dust, makes to occur under ferrum coal dust intermixture reservoir temperature after preheat redox reaction, passes through course of reaction
In exothermic effects improve reservoir temperature, thus realize oil reservoir combustion-assistant ignition, and the product of ferrum coal dust firing realize by way of parenthesis right
The profile control envelope of oil reservoir alters effect.
Injecting coal dust before igniting or after igniting, which kind of coal dust depend on injection is.Prior art is injected
It is ferrum coal dust (i.e. iron ore and the mixture of coal dust), its objective is, at electric heater, oil reservoir is heated to the condition of uniform temperature
Under, utilize iron ore and coal dust generation exothermic reaction to light oil reservoir, and the combustion product of ferrum coal dust realizes by way of parenthesis to oil reservoir
Profile control envelope alter effect.And the injection coal dust proposed in the ignition method of combustion in situ of the present invention is not intended to realize combustion-supporting point
Fire, and primarily to realize profile control envelope and alter, and inject certain coal dust as combustion adjuvant so that later stage oil reservoir is deep in oil reservoir
Portion burns the seriality of leading edge burning and effectively pushes.Oil layer ignition remains and realizes by electric igniter heating.
In one optional example of the present invention, as it is shown in figure 1, step 200 includes step 210, the coal dust that will prepare
In loading coal powder cabin 53；Step 220, the nitrogen after utilizing nitrogen gas conveying device to carry fluidisation in Pulverized Coal Bin 53, step 230,
After the coal dust in Pulverized Coal Bin 53 is filled, after utilizing fluidisation, coal dust is delivered in pans 52 by nitrogen；Step 240, utilizes nitrogen
Nitrogen after fluidisation pressurization is delivered in pans 52 by gas conveyer device, and utilizes the nitrogen after fluidisation pressurization to be carried by coal dust
To winding-up tank 51；Step 250, utilizes nitrogen gas conveying device be delivered in winding-up tank 51 by the nitrogen after fluidisation pressurization and utilize
Winding-up tank 51 is pressurizeed by above-mentioned nitrogen；Step 260, utilizes the nitrogen after fluidisation pressurization by the coal dust in winding-up tank 51 through winding-up mouth
511 spray into filling line 40, then are injected in oil reservoir 10 by coal dust by filling line 40 and oil pipe 30.Wherein, nitrogen after fluidisation
Jetting pressure more than inject air pressure at least 0.05MPa.
In an optional example of the present invention, described step 200 also includes step 270, compressed air is inputted
The mixing mouth 41 being located on filling line 40；Step 280, makes air and coal dust mix at mixing mouth 41, and utilizes above-mentioned air
Drive coal dust in oil pipe 30 injects oil reservoir 10, the most just achieve in the oil reservoir that with gas coal dust injected down-hole.
In an optional example, air is by after air compression by ground air compressor, by injecting well
The well head of 20, in oil pipe 30 is injected into oil reservoir 10, injects the amount of air and depends on the feature of oil reservoir and crude oil, generally,
Compressed-air actuated range of flow is every day 2 × 104m3To 25 × 104m3。
In one optional example of the present invention, as in figure 2 it is shown, the ignition method of the combustion in situ of present invention proposition also wraps
Include step 400, oil reservoir 10 is formally being lighted a fire in gas injection process, is intermittently injecting coal dust with air.On the one hand, after coal dust injects
Coal dust deposition can be formed near wellbore zone and oil reservoir, thus adjust interlayer permeability contrast；On the other hand, due to the combustion of coal dust
Point is relatively low relative to the burning-point of viscous crude, and such coal dust just can first be lighted, thus as oxidizer, promotes that the crude oil in oil reservoir is early
Realize high-temp combustion, finally can improve ignition success rate；Another further aspect, coal dust can be again in later stage live wire progradation, especially
It is that live wire is advanced to during the almost nil oil reservoir of oil saturation improve the oxidizer needed for burning, it is ensured that and promote that live wire is equal
Even propelling.
In one optional example of the present invention, as it is shown in figure 1, step 400 includes: step 410, control electric igniter temperature
Degree is preheating temperature, and this preheating temperature can be different according to the different oil products of oil reservoir Crude Oil, typically at about 150 DEG C, and
Electric igniter is made to keep this preheating temperature 1 day to 2 days；Step 420, by filling line 40 and oil pipe 30 through injecting well 20 to oil
Injecting air in layer 10, the injection rate of air is maximum day gas injection rate of design, mainly guarantee oil pipe 10 inwall greasy dirt and
Other impurity can be along with the crude oil melted be with air-blowing to shaft bottom or oil reservoir in heating process；Step 430, has breeze blowing system
Coal dust is sprayed into filling line 40 by system 50；Step 440, makes coal dust and air mix at mixing mouth 41, and utilizes air driven coal
Powder is in oil pipe 30 injects oil reservoir 10；Step 450, steps up the temperature of electric igniter, when its temperature reaches 250 DEG C,
Stop the injection of coal dust；Step 460, continues to improve the temperature of electric igniter, until lighting oil reservoir.Wherein, the gas injection rate of air
Can suitably adjust according to tail gas monitoring situation after oil reservoir is lighted.If oxygen content is more than 5% in tail gas monitoring, then subtract
Few day gas injection rate, but cannot be below minimum day gas injection rate of oil reservoir conceptual design；Otherwise, original gas injection state is kept.
In one optional example of the present invention, the injection rate of coal dust is 30g/m3Coal dust deliver a gas to 40g/m3Coal dust
Conveying gas.Coal dust is to be pulverized raw coal by flour mill to form after sieve decontamination.Coal dust is combustible, and its ignition point exists
Between 300 DEG C to 500 DEG C, its concentration of lower explosive limit is 34g/m3Coal dust deliver a gas to 47g/m3Coal dust conveying gas.Therefore,
In order to ensure safety, the coal dust injection rate in the present invention is 30g/m3Coal dust deliver a gas to 40g/m3Coal dust conveying gas, compares
The concentration of lower explosive limit of coal dust have dropped again 5% as secure threshold, further ensure that the safety of operating process.In the present invention
In, utilize the nitrogen after fluidisation from Pulverized Coal Bin 70, coal dust to be delivered to tank 50 of jetting, also in that the chemical property of nitrogen is not lived
Sprinkle, be difficult to and coal dust generation chemical reaction, thus ensure the safety in coal dust course of conveying.
In one optional example of the present invention, the injection rate of described coal dust is 30g/m3Coal dust deliver a gas to 40g/m3
Coal dust conveying gas.Wherein it is possible to make coal dust inject continuously in oil reservoir 10, or, it is also possible to intermittently to oil reservoir
Coal dust is injected in 10.
In one optional example of the present invention, as in figure 2 it is shown, the ignition method of the combustion in situ of present invention proposition also wraps
Include step 500, before combustion in situ, (be wherein, to solve to inject to the advantage injecting well profile control to injecting in well or producing well
The problem that in journey, interlayer gas injection is uneven；Advantage to producing well profile control is the problem solving later stage producing well has channeling) injection profile
Agent also carries out high-temperature profile control process to injection well or producing well, adds coal dust in profile control agent.
When needing the block using combustion in situ to develop or individual well early stage to have been developed for the longest in view of some
Between usually there will be the crafty layer that permeability is higher, it is uneven or gas channeling phenomenon occur that these thief's layers easily lead to burn gas injection, because of
This, can carry out high-temperature profile control process before gas injection of formally lighting a fire these blocks or individual well.High-temperature profile control processes can be in step
Carry out before rapid 100 injection air, it is also possible to carrying out after step 100 injects air, it cuts both ways.Although high-temperature profile control
Process and can reduce the injection rate of coal dust before being placed on injection air and reduce cost, but, note after processing due to high-temperature profile control
Enter the Reservoir Permeability around well can decrease, the injection of coal dust will be unfavorable for.On the other hand, it is considered to oil field actual production
Cheng Zhong, cannot be completely secured due to high-temperature profile control measure effect duration and measure is relatively costly, therefore, on-the-spot seldom real at injection well
Execute profile control, and only just implement profile control at producing well when has channeling is the most serious and process.Therefore or suggestion step 100 gas injection it
After implement again high-temperature profile control process.
In one optional example of the present invention, step 500 includes: step 510, by Coalblowing system 50 by pulverized coal injection
Enter equipped with in the dispersing and dissolving tank 80 of profile control agent；Step 520, makes coal dust be entered ripening tank 70 with profile control agent by dispersing and dissolving tank 80
In；Step 530, the coal dust in stirring ripening tank 70 and profile control agent, make coal dust and profile control agent be mixed to form in ripening tank 70 mixed
Close liquid；Step 540, is delivered to inject in well 20 (or producing well) by above-mentioned mixed liquor by pump 60, and injects oil reservoir through oil pipe 30
In 10.
The ignition method of the combustion in situ that the present invention proposes, has three kinds of coal dust injection modes, realizes stage by stage toward oil
Coal dust is injected: one is to inject a certain amount of coal dust and realize while profile control envelope is altered toward in oil reservoir with injecting air before ignition in Ceng
Inject certain coal dust as combustion adjuvant, it is simple to moving forward steadily of later stage oil reservoir deep combustion front；Two is before ignition with change
Learn profile control agent and inject a certain amount of coal dust, proposed here a kind of new method altering additive using coal dust as fireflood profile control envelope.
Three is to be intermittently injecting a certain amount of coal dust with injection air in ignition process.
Explaining in detail for the respective embodiments described above, its purpose be only that the present invention is explained in order to be able to
It is more fully understood that the present invention, but, these describe can not be limitation of the present invention with any explanation one-tenth, particularly,
Each feature described in different embodiments can also mutual combination in any, thus form other embodiments, except having
Specifying contrary description, these features should be understood can be applied in any one embodiment, and is not limited merely to
Described embodiment.
Claims (14)
1. the equipment injecting coal dust in oil reservoir, it is characterised in that described equipment includes:
Oil pipe, is arranged in injection well or producing well；
Coalblowing system, is located on ground, and described Coalblowing system has coal dust input port and winding-up mouth, by described winding-up
Coal dust is sprayed by mouth；
Filling line, is connected between the winding-up mouth of described oil pipe and described Coalblowing system, will be sprayed by described winding-up mouth
Coal dust be sent to described oil pipe.
2. in oil reservoir, inject the equipment of coal dust as claimed in claim 1, it is characterised in that described Coalblowing system includes
Pulverized Coal Bin, pans, winding-up tank and nitrogen gas conveying device, described Pulverized Coal Bin, described pans and described winding-up tank be arranged in series,
Described coal dust input port is located in described Pulverized Coal Bin, and described winding-up mouth is located on described winding-up tank, and described nitrogen gas conveying device divides
Not being connected with described Pulverized Coal Bin, pans and winding-up tank, described nitrogen gas conveying device is after described Pulverized Coal Bin conveying fluidisation
Nitrogen, described nitrogen gas conveying device nitrogen after described pans and described winding-up tank carry fluidisation pressurization.
3. in oil reservoir, inject the equipment of coal dust as claimed in claim 1, it is characterised in that offer on described filling line
Having mixing mouth, described mixing mouth is connected with carrying compressed-air actuated air delivering pipeline.
4. in oil reservoir, inject the equipment of coal dust as claimed in claim 1, it is characterised in that described equipment also includes:
Dispersing and dissolving tank, is located on ground, is used for dissolving the spray of profile control agent, described dispersing and dissolving tank and described Coalblowing system
Mouthpiece is connected；
Ripening tank, is connected between described dispersing and dissolving tank and described filling line, is provided with agitator in described ripening tank；
Pump, is arranged on described filling line, and the mixed liquor in described ripening tank is pumped into described oil pipe.
5. in oil reservoir, inject the equipment of coal dust as claimed in claim 1, it is characterised in that described equipment also includes:
Electric igniter, be arranged at described in inject into well, for lighting described oil reservoir and the described coal dust injected through described oil pipe.
6. the ignition method of a combustion in situ, it is characterised in that by as described in any one in claim 1 to 5 to
Oil reservoir injects the equipment of coal dust and coal dust injects oil reservoir, and described method includes:
Step 100, before formally to oil layer ignition gas injection, injects air in advance in oil reservoir by injecting well, and monitors production
The change of the moisture content of well；
Step 200, after the moisture content of described producing well drops to below 80%, while injecting air, by breeze blowing
Coal dust is sprayed into filling line by system, through described filling line, coal dust is transported to described injection well, and through oil pipe to described oil reservoir
The described coal dust of middle injection；
Step 300, formally carries out gas injection of lighting a fire by described injection well to described oil reservoir.
7. the ignition method of combustion in situ as claimed in claim 6, it is characterised in that described step 200 includes:
Step 210, loads the described coal dust prepared in described Pulverized Coal Bin；
Step 220, the nitrogen after conveying fluidizes in described Pulverized Coal Bin；
Step 230, after the coal dust in described Pulverized Coal Bin is filled, after utilizing described fluidisation, described coal dust is delivered to centre by nitrogen
In tank；
Step 240, will fluidisation pressurization after nitrogen be delivered in described pans, and utilize described fluidisation pressurization after nitrogen will
Described coal dust is delivered in described winding-up tank；
Step 250, is delivered to the nitrogen after fluidisation pressurization in described winding-up tank and utilizes described nitrogen to add described winding-up tank
Pressure；
Step 260, utilizes described nitrogen the coal dust in described winding-up tank to be sprayed into described filling line, by described filling line
With described oil pipe, described coal dust is injected in described oil reservoir.
8. the ignition method of combustion in situ as claimed in claim 6, it is characterised in that also include in described step 200:
Step 270, inputs the mixing mouth being located on described filling line by compressed air；
Step 280, makes described air and described coal dust mix at described mixing mouth, and utilizes coal dust warp described in described air driven
Described oil pipe injects in described oil reservoir.
9. the ignition method of combustion in situ as claimed in claim 8, it is characterised in that described air is compressed air, described
The range of flow of air is every day 2 × 104Cubic meter is to 25 × 104Cubic meter.
10. the ignition method of combustion in situ as claimed in claim 8, it is characterised in that the injection rate of described coal dust is 30g/m3
Coal dust deliver a gas to 40g/m3Coal dust conveying gas.
The ignition method of 11. combustion in situ as claimed in claim 6, it is characterised in that described method also includes step 400,
Described oil reservoir is formally being lighted a fire in gas injection process, is intermittently injecting described coal dust with air.
The ignition method of 12. combustion in situ as claimed in claim 11, it is characterised in that described step 400 includes:
Step 410, controls electric igniter temperature for preheating temperature, and makes described electric igniter keep described preheating temperature 1 day to 2
My god；
Step 420, injects air, described sky by described filling line and described oil pipe through described injection well in described oil reservoir
The injection rate of gas is maximum day gas injection rate of design；
Step 430, is sprayed into described filling line by described Coalblowing system by coal dust；
Step 440, makes described coal dust and described air mix at the mixing mouth being located on described filling line, and utilizes described sky
The band of gas moves described coal dust in described oil pipe injects described oil reservoir；
Step 450, steps up the temperature of described electric igniter, when temperature reaches 250 DEG C, stops the injection of described coal dust；
Step 460, continues to improve the temperature of electric igniter, until lighting oil reservoir.
The ignition method of 13. combustion in situ as claimed in claim 6, it is characterised in that described method includes step 500,
Before combustion in situ, injection profile agent described injection well or described producing well are carried out high temperature in described injection well or producing well
Profile control processes, and adds described coal dust in described profile control agent.
The ignition method of 14. combustion in situ as claimed in claim 13, it is characterised in that described step 500 includes:
Step 510, is sprayed into coal dust equipped with in the dispersing and dissolving tank of described profile control agent by described Coalblowing system；
Step 520, makes described coal dust enter in ripening tank by described dispersing and dissolving tank with described profile control agent；
Step 530, stirs the described coal dust in described ripening tank and described profile control agent, makes described coal dust and described profile control agent in institute
State in ripening tank and be mixed to form mixed liquor；
Step 540, is delivered to described injection well or described producing well by described mixed liquor through described filling line by pump, and through institute
State oil pipe to inject in described oil reservoir.
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| CN109826604A (en) * | 2019-01-08 | 2019-05-31 | 中国石油天然气股份有限公司 | A kind of combustion-supporting envelope of fireflood oil reservoir alters method |
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