CN107558978A - Thickened oil recovery system and method - Google Patents
Thickened oil recovery system and method Download PDFInfo
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- CN107558978A CN107558978A CN201710751864.0A CN201710751864A CN107558978A CN 107558978 A CN107558978 A CN 107558978A CN 201710751864 A CN201710751864 A CN 201710751864A CN 107558978 A CN107558978 A CN 107558978A
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Abstract
The invention provides a kind of thickened oil recovery system and method, wherein, the system includes：Gas injection well, producing well and gasifying agent injection device；Wherein, gas injection well is horizontal directional drilling, and gas injection well is worn into target oil reservoir by ground, and gasifying agent injection device is movably positioned in gas injection well, and the end of gasifying agent injection device from the horizontal segment of gas injection well is moved at the steady tilted section of gas injection well；Producing well is horizontal directional drilling, producing well is worn into target oil reservoir by ground, and producing well is placed in the lower section of gas injection well, and, there is pre-determined distance, gas injection well is connected with the part that producing well is placed in target oil reservoir with target oil reservoir between producing well and gas injection well.In the present invention, so that the injection direction of gasifying agent with combustion front direction of advance on the contrary, the more balanced burning of combustion front, avoids the fire that gasifying agent occurs with the combustion reaction of target oil reservoir and alters phenomenon, the safe and stable operation of gas injection well is ensure that, effectively increases controlling extent of the well pattern to stratum.
Description
Technical field
The present invention relates to fossil energy production technique field, in particular to a kind of thickened oil recovery system and method.
Background technology
In world's crude resources reserves, heavy oil reserves occupy very big proportion, but exploitation effect is generally bad, recovery ratio compared with
It is low.About 63.2 hundred million tons of the Low permeable oil and gas reservoirs in China, still have 50% or so not employ, and the hyposmosis resource employed, due to
The restriction of technical merit, average recovery ratio are only 23.3%.How preferably heavy crude producing, the recovery ratio of viscous crude is improved, be mesh
The important topic of preceding research.
Viscous crude flow resistance is big, and heating exploitation method is usually taken for the viscous crude in oil reservoir.At present, domestic heavy crude heat extraction
Mode includes：Steam soak, steam drives and SAGD (SAGD, Steam Assisted Gravity
Drainage).But recovery ratio is about 20~30%, production efficiency is low, also, above-mentioned thermal recovery mode is required to injection and steamed
Vapour, so cause energy consumption big, pollute the problems such as big.Compared with above-mentioned thermal recovery technology, fireflood technology has low energy consumption, low dirt
The advantages that dye, economical and efficient.Conventional fireflood technology is horizontal well fireflood assisted gravity drainage method, and its well pattern is one
Peupendicular hole and a horizontal well, peupendicular hole are arranged at the toe position of horizontal well, and peupendicular hole is horizontal as igniting and air injection well
Well is as producing well.It is under gravity, using gas and the density contrast of liquid, to arrive crude oil flow that it, which produces mechanism,
In horizontal well, it is extracted, therefore is referred to as horizontal well fireflood assisted gravity drainage method.
However, existing horizontal well fireflood assisted gravity drainage exploitation pattern, using protrusive combustion system, i.e. air is noted
Enter direction and combustion front direction of advance be relatively uniform, it is easy to occur combustion front along horizontal wellbore alter into, once horizontal well
Generation fire is altered, and its heat front involves scope and just no longer expanded, and horizontal wellbore may burn because fire is altered and cause ground hazards
Increase.
The content of the invention
In consideration of it, the present invention proposes a kind of thickened oil recovery system, it is intended to solves horizontal well fireflood in the prior art and aids in
The problem of fire is altered easily occurs for gravity drainage method.The invention also provides a kind of thickened oil recovery method.
On one side, the present invention proposes a kind of thickened oil recovery system, and the system includes：Gas injection well, producing well and gasification
Agent injection device；Wherein, gas injection well is horizontal directional drilling, and gas injection well is worn into target oil reservoir by ground, gasifying agent injection
Equipment is movably positioned in gas injection well, gasifying agent injection device from gas injection well horizontal segment steady tilted section from end to gas injection well
Place's movement；Producing well is horizontal directional drilling, and producing well is worn into target oil reservoir by ground, and producing well is placed under gas injection well
Side, also, has pre-determined distance between producing well and gas injection well, the part that gas injection well and producing well are placed in target oil reservoir with
Target oil reservoir is connected.
Further, in above-mentioned thickened oil recovery system, the horizontal segment of producing well is placed in the predetermined position of target oil reservoir；Adopt
The horizontal segment of oil well is placed in the lower section of the horizontal segment of gas injection well, also, between the horizontal segment of producing well and the horizontal segment of gas injection well
With pre-determined distance；The horizontal segment of gas injection well and the horizontal segment of producing well are placed in being connected in target oil reservoir and with target oil reservoir
It is logical.
Further, in above-mentioned thickened oil recovery system, gas injection sleeve pipe is provided with gas injection well, gas injection sleeve pipe corresponds to gas injection
The part of well horizontal segment offers multiple perforates；And/or long string is provided with producing well, long string, which corresponds to, to recover the oil
The part of well horizontal segment offers multiple perforates.
Further, in above-mentioned thickened oil recovery system, the part that gas injection sleeve pipe corresponds to gas injection well horizontal segment is screen casing；
And/or long string is screen casing corresponding to the part of producing well horizontal segment.
Further, in above-mentioned thickened oil recovery system, gasifying agent injection device includes：Continuous pipe, nozzle, it is placed in ground
Injector and roller；Wherein, the first end of continuous pipe is rotationally wound in roller, and the second end of continuous pipe is movably positioned in
In gas injection well, nozzle is connected to the second end of continuous pipe；Continuous pipe is slideably arranged in injector, and injector is used for the company of control
Continuous position of the pipe in gas injection well.
Further, in above-mentioned thickened oil recovery system, gasifying agent injection device also includes：Thermal packer；Wherein, Thermal packer connects
It is connected to the second end of continuous pipe and is set close to nozzle.
Further, in above-mentioned thickened oil recovery system, gas injection well is oppositely arranged with producing well；Or gas injection well is with recovering the oil
Well is placed in the same side.
In the present invention, by the gasifying agent injection device in gas injection well from gas injection well horizontal segment end at steady tilted section
It is mobile so that the injection direction of gasifying agent is with combustion front direction of advance on the contrary, the combustion that to enable to combustion front more balanced
Burn, avoid the fire that gasifying agent occurs with the combustion reaction of target oil reservoir and alter phenomenon, it is ensured that the safe and stable operation of gas injection well, solution
The problem of fire is altered easily occurs for horizontal well fireflood assisted gravity drainage method in the prior art of having determined, and effectively increases well pattern to stratum
Controlling extent, improve the sweep efficiency of live wire in the plane, also, gasifying agent injection device may move in gas injection well and make
The injection phase for obtaining gasifying agent may move, and can adjust gas injection position according to reservoir characteristics, effectively ensure that heat involves scope,
Improve the thermal efficiency.
On the other hand, the invention also provides a kind of thickened oil recovery method, this method comprise the following steps：Shaft building step,
Respectively by boring gas injection well and producing well in the object-oriented oil reservoir in ground, there is pre-determined distance between gas injection well and producing well；Wherein, note
Gas well and producing well are horizontal orientation well, also, the part that gas injection well is placed in target oil reservoir with producing well is oily with target
Layer is connected；Infiltration lane step is established, infiltration lane is established between gas injection well and producing well；Reactions steps, light gas injection
The crude oil of the end of the horizontal segment of well, and gasifying agent is injected, gasifying agent carries out reaction generation reacting gas with crude oil and discharged
Heat, crude oil under the driving of thermodynamic activity and reacting gas through permeability channel flows to producing well at；Oil recovery step, collection are adopted
Crude oil around oil well, and it is delivered to ground；After the burning crude oil of the end of the horizontal segment of gas injection well in reactions steps, to
Next opening position injection gasifying agent of the horizontal segment of gas injection well, repeats above-mentioned reactions steps and oil recovery step, until gasifying agent
Injection phase by the end of the horizontal segment of gas injection well be moved to gas injection well steady tilted section stop injection gasifying agent.
Further, in above-mentioned thickened oil recovery method, in shaft building step, the horizontal segment of producing well is placed in the pre- of target oil reservoir
If opening position；The horizontal segment of producing well is placed in the lower section of the horizontal segment of gas injection well, also, the horizontal segment of producing well and gas injection well
There is pre-determined distance between horizontal segment；The horizontal segment of gas injection well and the horizontal segment of producing well are placed in target oil reservoir and and mesh
Mark oil reservoir is connected.
Further, in above-mentioned thickened oil recovery method, establish impregnation step and further comprise：Respectively to gas injection well and oil recovery
Steam of the injection with preset temperature in well, to heat target oil reservoir；The pressure in gas injection well is lifted, so that the level of gas injection well
For crude oil between section and the horizontal segment of producing well to flowing at producing well, the passage of crude oil flow is infiltration lane；Stop to
Steam is injected in gas injection well and producing well.
Further, in above-mentioned thickened oil recovery method, in oil recovery step, cooling medium is injected into producing well.
In the present invention, by the injection phase of gasifying agent from gas injection well horizontal segment end to moving at steady tilted section, make
Gasifying agent injection direction with combustion front direction of advance on the contrary, the burning that to enable to combustion front more balanced, is avoided
The fire that gasifying agent occurs with target oil reservoir combustion reaction alters phenomenon, it is ensured that the safe and stable operation of gas injection well, effectively improves
Controlling extent of the well pattern to stratum, improves the sweep efficiency of live wire in the plane, also, the injection phase of gasifying agent is removable
Kinetic energy is enough to adjust gas injection position according to reservoir characteristics, effectively ensures that heat involves scope, improves the thermal efficiency.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is the structural representation of thickened oil recovery system provided in an embodiment of the present invention；
Fig. 2 is the structural representation at gas injection well horizontal segment in thickened oil recovery system provided in an embodiment of the present invention；
Fig. 3 is the cross-sectional view at target oil reservoir in thickened oil recovery system provided in an embodiment of the present invention；
Fig. 4 is the another structural representation of thickened oil recovery system provided in an embodiment of the present invention；
Fig. 5 is the structured flowchart of thickened oil recovery method provided in an embodiment of the present invention；
Fig. 6 is the structured flowchart that impregnation step is established in thickened oil recovery method provided in an embodiment of the present invention.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.It should be noted that in the case where not conflicting, embodiment in the present invention and
Feature in embodiment can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
System embodiment：
Referring to Fig. 1 to Fig. 3, the preferred structure of the thickened oil recovery system in the present embodiment is shown in figure.It is as illustrated, thick
Oily mining system can include：Gas injection well 1, producing well 2 and gasifying agent injection device 3.Wherein, gas injection well 1 is horizontal directional drill
Well, gas injection well 1 are worn into target oil reservoir 5 by ground 4.Specifically, can be pre-selected target oil reservoir 5, gas injection well 1 it is vertical
Section is connected with ground 4, and the horizontal segment of gas injection well 1 is placed in target oil reservoir 5, leads between the vertical section and horizontal segment of gas injection well 1
Steady tilted section connection is crossed, the steady tilted section is partially disposed in target oil reservoir 5.The part that gas injection well 1 is placed in target oil reservoir 5 and target oil
Layer 5 is connected, it is preferred that the horizontal segment of gas injection well 1 is connected with target oil reservoir 5.
Gasifying agent injection device 3 is movably positioned in gas injection well 1, gasifying agent injection device 3 by gas injection well 1 horizontal segment
Steady tilted section (left end shown in Fig. 1) place from end (right-hand member shown in Fig. 1) to gas injection well 1 move (according to the arrow shown in Fig. 1
Move in direction), gasifying agent injection device 3 is used to convey gasifying agent into gas injection well 1.Injection position of the gasifying agent in gas injection well 1
Put be from the end of the horizontal segment of gas injection well 1 to the steady tilted section of gas injection well 1 at progressively move conveying.Gasifying agent includes：Oxygen,
Water vapour, water, carbon dioxide, air etc..
Producing well 2 is horizontal directional drilling, and producing well 2 is worn into target oil reservoir 5 by ground 4.Specifically, producing well 2
Vertical section be connected with ground 4, the horizontal segment of producing well 2 is placed in target oil reservoir 5, the vertical section and horizontal segment of producing well 2
Between connected by steady tilted section, the steady tilted section is partially disposed in target oil reservoir 5.The part that producing well 2 is placed in target oil reservoir 5 with
Target oil reservoir 5 is connected, it is preferred that the horizontal segment of producing well 2 is connected with target oil reservoir 5.Producing well 2 is used to gather surrounding
Crude oil, when it is implemented, oil production equipment 6 can be provided with producing well 2, the original around producing well 2 is gathered by oil production equipment 6
Oil.
Producing well 2 is placed in the lower section (for Fig. 1) of gas injection well 1, has between producing well 2 and gas injection well 1 default
Distance, specifically, have between the part that the part and gas injection well 1 that producing well 2 is placed in target oil reservoir 5 are placed in target oil reservoir 5
There is pre-determined distance, the pre-determined distance is used to form infiltration lane between producing well 2 and gas injection well 1, and the infiltration lane is used for
Producing well 2 is set to be connected with gas injection well 1, so that the Crude Oil of target oil reservoir 5 can be moved to oil recovery by gas injection well 1 through infiltration lane
Jing2Chu.
When it is implemented, can arrange peupendicular hole in the both sides of gas injection well 1, the peupendicular hole is used for auxiliary into target oil reservoir 5
Help injection gasifying agent.Peupendicular hole can also be arranged in the both sides of producing well 2, the peupendicular hole is used for assisted acquisition crude oil.
When it is implemented, the length of the horizontal segment of gas injection well 1 and the length of horizontal segment of producing well 2 can be according to targets
Oil reservoir 5 and recovery features determine that design principle is to control the oil in-place of target oil reservoir 5 to greatest extent, generally
300~900m.In the present embodiment, the length of the horizontal segment of the length of the horizontal segment of gas injection well 1 and producing well 2 be 500m or
400m。
During work, for not having the high viscosity oil of fluid ability under the initial condition of stratum, gas injection well 1 and oil recovery are being utilized
, it is necessary to establish infiltration lane between gas injection well 1 and producing well 2 by way of preheating oil reservoir before well 2 is recovered the oil.Specifically
Ground pre-heating mean is：Steam of the injection with preset temperature into gas injection well 1 and producing well 2 respectively, preset because steam has
Temperature, so by heat transfer the oil reservoir around the horizontal segment of gas injection well 1 and the horizontal segment of producing well 2 can be heated, improve
The mobility of crude oil.Continue to inject a certain amount of steam into gas injection well 1, to lift the pressure in gas injection well 1 so that gas injection
Pressure in well 1 is slightly above the pressure in producing well 2, pressure difference between well so, between gas injection well 1 and producing well 2 is formed, between the well
Pressure difference causes the crude oil between two wells to flow to producing well 2, i.e. crude oil between the horizontal segment of gas injection well 1 and the horizontal segment of producing well 2
Producing well 2 is flowed to, the passage of the crude oil flow is infiltration lane.Stop injecting steam into gas injection well 1 and producing well 2, this
When preheating complete.
Gasifying agent injection device 3 is put into gas injection well 1, gasifying agent injection device 3 is positioned over horizontal apart from gas injection well 1
At a certain distance from the end of section.Gasifying agent injection device 3 injects the gasifying agent with preset temperature into gas injection well 1, utilizes
The temperature of gasifying agent causes the Crude Oil of target oil reservoir 5 to be heated.Crude oil after heating is ignited, gasifying agent injection device 3 continues
Gasifying agent is passed through, and by adjusting the input quantity of gasifying agent, cultivates combustion zone 7, until oil reservoir burning tends towards stability.
When it is implemented, the mode that crude oil ignites can use forced oxidation and ignition, silane igniting, electric ignition etc., this reality
Example is applied to be not intended to be limited in any this.Wherein, forced oxidation and ignition is to cause crude oil to be heated rear temperature using the temperature of gasifying agent
Degree is gradually risen to self-ignition point, and then the oil reservoir that ignites.Silane igniting is that silane and air spontaneous combustion produce heat and ignited oil reservoir.
After oil reservoir burning tends towards stability, temperature field as shown in Figures 2 and 3 is formed in target oil reservoir 5, substantially can be with
It is divided into combustion zone 7, coking area 8 and moveable oil area 9.Wherein, combustion zone 7 is the main region for producing heat, and injection target is oily
In combustion zone 7 and crude oil combustion reaction, i.e. C+O occur for the oxygen in gasifying agent in layer 52→CO2, combustion reaction by target oil
Part crude oil in layer 5 is burnt up and discharges heat, and the temperature in the region is typically at 900~1100 DEG C.The heat of combustion zone 7 to
Surrounding oil reservoir transmission, the leading edge against combustion zone 7 are coking area 8, and the combustion reaction of combustion zone 7 release is utilized in coking area 8
Heat carries out gasification reaction, i.e. C+H2O→CO+H2、C+CO2→2CO、C+2H2→CH4, and carry out pyrolytic reaction, i.e. macromolecular
Hydrocarbon pyrolysis, generation coke, the hydro carbons and gas of small molecule, such as CH4、C2H4Deng.Therefore, the master of the reaction generation in coking area 8
It is CO to want composition2And water vapour, and small part fuel gas such as CH4, CO and H2Deng high-temperature gas, wherein, water vapour comes from mesh
The water vapour that the absorption water contained in mark oil reservoir 5 is thermally generated in advance, the temperature in the region are typically in the range of 300~900 DEG C.Reaction produces
Heat transmitted under thermograde and pressure effect in target oil reservoir 5 so that the underground water in reservoir is formed by thermal evaporation
Vapor chamber, the viscosity that is heated of the crude oil in target oil reservoir 5 decline, and mobility greatly improves, also, underground water is by thermogenetic steam
It can play a part of being driven crude oil.Meanwhile the small molecule oil-gas migration that the thermal cracking of coking area 8 is formed is to moveable oil area
9, the temperature in moveable oil area 9 is less than 300 DEG C.In moveable oil area 9, the mobility of the mixture of small molecule oil gas and crude oil is significantly
Improve, because producing well 2 is placed in the lower section of gas injection well 1, so, crude oil is through permeability channel flows in the presence of heating power and gravity
To producing well 2, oil production equipment 6 in producing well 2 is by the continuous pump drainage of reacting gas caused by crude oil and reaction to ground 4.
After at crude oil flow to the producing well 2 of the horizontal segment end of gas injection well 1 and collected, by gasifying agent injection device 3
Position be moved to the left next gas injection position, in the new gas injection position, continue inject gasifying agent, repeat aforesaid operations,
The crude oil of new gas injection opening position is driven and gathered.The position of gasifying agent injection device 3 by the horizontal segment of gas injection well 1 end
The end gradually movement to retrusive at the steady tilted section of gas injection well 1 (according to the direction of arrow movement shown in Fig. 1), until being moved to gas injection
Stop injection gasifying agent at the steady tilted section of well 1, then the displacement of reservoir oil and the process recovered the oil finish.
When it is implemented, the moving direction of gasifying agent injection device 3 moves for retrusive, and the note of gasifying agent injection device 3
The direction of the gasifying agent entered is opposite with the moving direction of gasifying agent gas injection equipment 3, that is to say, that gasifying agent injection device 3 exists
The direction of the gasifying agent injected at any position is forward (opposite with the direction of arrow shown in Fig. 1).However, gasifying agent injects
The moving direction of equipment 3 is (to be moved backward according to the direction of arrow shown in Fig. 1), and the crude oil in target oil reservoir 5 is burnt
When burning direction be also then overall in opposite direction, the production of the injection direction of gasifying agent and combustion front or combustion zone backward
The effect of reverse combustion has been given birth to, has enabled to the burning that combustion front is more balanced, gasifying agent has been avoided and is burnt with target oil reservoir 5
The fire that reaction occurs alters phenomenon, it also avoid the problem of burning tends to skew.
When it is implemented, in warm-up phase, speed, preheating steam injection mass dryness fraction, the preheating steam injection annular space pressure of preheating injection steam
Power, steam injection pressure difference apply the major parameter that opportunity and size etc. are warm-up phases.In the present embodiment, steam injection rate 80m3/
D, steam quality 70%, steam injection pressure depend on oil reservoir initial pressure, in the present embodiment, steam injection pressure 2.5MPa.Pre-
The first pipe and the second pipe are provided with hot stage, gas injection well 1 and producing well 2, the first pipe sleeve is located in the second pipe, and first
Between pipe and the second pipe there is gap to form casing space, gas injection well 1 and producing well 2 are to input steam into the first pipe, are steamed
Vapour is delivered in target oil reservoir 5 through the first pipe, is circulated using superheated steam and is caused gas injection well 1 and producing well 2 to form higher temperature
Spend field.Moisture caused by steam can be delivered to ground by the casing space of gas injection well 1 and the casing space of producing well 2 respectively,
Crude oil gathering system is delivered to again.
When it is implemented, gasifying agent injection device 3 is positioned over 0~20m apart from the horizontal segment end of gas injection well 1 first,
It is 5m in the present embodiment.Before oil reservoir spontaneous combustion, the preset temperature for the gasifying agent that gasifying agent injection device 3 injects is 350 DEG C, and flow is
300~600Nm3/ h, the temperature of oil reservoir self-ignition point are generally 200~220 DEG C.After oil reservoir burning tends towards stability, the stream of gasifying agent
Amount control is in 600~2000Nm3/ h, 21~60%, the gas injection pressure of gasifying agent is true according to reservoir pressure for oxygen concentration control
It is fixed.
, can be by adjusting the flow of the gasifying agent injected, gasifying for the inhomogeneity of oil reservoir during reaction
Agent pressure, oxygen concentration, water-carrying capacity etc., to maintain the scope of combustion zone 7, temperature, heat and heat loss, and control to maintain crude oil
The region in moveable oil area 9, until the crude oil near the gas injection position is completed by flowing displacement, oil recovering can be effectively improved
Rate.
When it is implemented, the position of gasifying agent injection device 3 is gradually steady to gas injection well 1 from the end of the horizontal segment of gas injection well 1
At oblique section in the moving process of retrusive, retreat mobile distance and be generally 0~50m, be in the present embodiment 15m or 6m.
When it is implemented, producing well 2 can be the mode modes such as lifting, sucker rod pumping to the row's of adopting mode of crude oil.Adopt
Oil gas separation equipment is also provided with oil well 2, the oil gas separation equipment is used to carry out the crude oil of collection and reacting gas
Separation, and then it is easy to the collection and discharge of reacting gas.
As can be seen that in the present embodiment, the horizontal segment by the gasifying agent injection device 3 in gas injection well 1 by gas injection well 1
Moved at steady tilted section end so that before the injection direction of gasifying agent and combustion front direction of advance are on the contrary, enable to burning
The more balanced burning of edge, avoid the fire that gasifying agent occurs with the combustion reaction of target oil reservoir 5 and alter phenomenon, it also avoid burning and become
In skew the problem of, it is ensured that the safe and stable operation of gas injection well 1, solve horizontal well fireflood assisted gravity in the prior art and let out
The problem of fire is altered easily occurs for oily method, effectively increases controlling extent of the well pattern to stratum, improves the ripple of live wire in the plane
And coefficient, also, gasifying agent injection device 3 may move in gas injection well 1 and the injection phase of gasifying agent may move, Neng Gougen
According to reservoir characteristics adjustment gas injection position, effectively ensure that heat involves scope, improves the thermal efficiency.
With continued reference to Fig. 1 to Fig. 3, in above-described embodiment, the horizontal segment of producing well 2 is placed in the predeterminated position of target oil reservoir 5
Place, specifically, the horizontal segment of producing well 2 is close to the position of the bottom of target oil reservoir 5.When it is implemented, the predeterminated position can root
Determined according to actual conditions, the present embodiment is not intended to be limited in any to this.
The horizontal segment of producing well 2 is placed in the lower section (for Fig. 1) of the horizontal segment of gas injection well 1, also, producing well 2
Horizontal segment and gas injection well 1 horizontal segment between there is pre-determined distance, the pre-determined distance refers to vertical range.The pre-determined distance
It can be determined according to oil reservoir and recovery features, generally 2~20m, in the present embodiment, the pre-determined distance is 10m.Specifically
During implementation, infiltration lane is established between the horizontal segment of gas injection well 1 and the horizontal segment of producing well 2.
The horizontal segment of gas injection well 1 is placed in target oil reservoir 5, also, the horizontal segment of gas injection well 1 is connected with target oil reservoir 5.
Meanwhile the horizontal segment of producing well 2 is placed in target oil reservoir 5, also, the horizontal segment of producing well 2 is connected with target oil reservoir 5, this
Sample, it is easy to infiltration lane to be established between the horizontal segment of gas injection well 1 and the horizontal segment of producing well 2, and then causes in target oil reservoir 5
Crude oil can under gravity and thermodynamic activity preferably through permeability channel flows to producing well 2 at.
During construction, can first from ground 4 into target oil reservoir 5 drilling oil well 2, then carry out construct gas injection well 1, using magnetic
Guidance system is by the TRAJECTORY CONTROL of the horizontal segment of gas injection well 1 in setting range.The setting range can according to actual conditions come
It is determined that the present embodiment does not do any restrictions to this.
As can be seen that in the present embodiment, the horizontal segment of gas injection well 1 is placed in the top of the horizontal segment of producing well 2, so, note
Crude oil at gas well 1 be easy to after being reacted with gasifying agent under gravity through permeability channel flows to producing well 2 at, be easy to
The flowing of crude oil, also, the horizontal segment of producing well 2 is placed in the predetermined position of target oil reservoir 5, can maximally utilise weight
The height of power draining, it is easy at the crude oil flow in target oil reservoir 5 to producing well 2.
With continued reference to Fig. 1 to Fig. 3, in the various embodiments described above, gas injection sleeve pipe is provided with gas injection well 1, gas injection sleeve pipe is corresponding
Offer multiple perforates in the part of the horizontal segment of gas injection well 1 so that the gasifying agent in gas injection well 1 preferably with the phase of target oil reservoir 5
Contact.Specifically, when the horizontal segment of gas injection well 1 is bore hole, the part that gas injection sleeve pipe corresponds to the horizontal segment of gas injection well 1 can be
Screen casing, screen casing can be cutting seam sieve tube or wire-wrapped screen, preferably cutting seam sieve tube.The material of screen casing can be fiberglass.
When the horizontal segment progress sealing of gas injection well 1, when typically using cement sealing, gas injection sleeve pipe can be corresponded to by perforating system
The part of the horizontal segment of gas injection well 1 opens up multiple perforates.
Long string is provided with producing well 2, the part that long string corresponds to the horizontal segment of producing well 2 offers multiple open
Hole, so that producing well 2 preferably connects with target oil reservoir 5, it is easy to crude oil and reacting gas being collected, improves effect of recovering the oil
Rate.Specifically, when the horizontal segment of producing well 2 is bore hole, the part that long string corresponds to the horizontal segment of producing well 2 can be sieve
Pipe, is preferably connected with target oil reservoir 5 with forming duct, is easy to receive more crude oil and reacting gas.Screen casing can be to cut
Slit screen pipes or wire-wrapped screen, preferably cutting seam sieve tube.The material of screen casing can be fiberglass.When the horizontal segment of producing well 2
Sealing is carried out, when typically using cement sealing, long string can be corresponded to the portion of the horizontal segment of producing well 2 by perforating system
Separately set multiple perforates.
The part that gas injection sleeve pipe corresponds to the horizontal segment of gas injection well 1 offers multiple perforates, and/or, long string corresponds to
The part of the horizontal segment of producing well 2 offers multiple perforates.That is, can be only, gas injection sleeve pipe corresponds to the water of gas injection well 1
The part of flat section offers multiple perforates；Can also be only that the part that long string corresponds to the horizontal segment of producing well 2 offers
Multiple perforates；It is also possible that the part that gas injection sleeve pipe corresponds to the horizontal segment of gas injection well 1 offers multiple perforates, also, the set that recovers the oil
Pipe offers multiple perforates corresponding to the part of the horizontal segment of producing well 2.
When it is implemented, cooling medium can be injected into producing well 2 according to actual conditions, to reduce the temperature of producing well 2
Degree, avoids burning out the long string in producing well 2 or coking.Cooling medium can be steam, water, hydrogen, hydro carbons etc..
As can be seen that in the present embodiment, offered out by the part of the horizontal segment of gas injection sleeve pipe gas injection well 1 in gas injection well 1
Hole, enable to the gasifying agent of conveying in gas injection sleeve pipe to be preferably in contact with target oil reservoir 5, increase gasifying agent and crude oil
Contact area, the displacement of reservoir oil is better achieved；Long string offers perforate corresponding to the part of the horizontal segment of producing well 2 in producing well 2,
Enable to long string to be preferably in contact with target oil reservoir 5, be easy to gather the crude oil near long string, improve oil recovery
Efficiency.
Referring to Fig. 1 and Fig. 2, in the various embodiments described above, gasifying agent injection device 3 can include：Continuous pipe 31, nozzle 32,
Injector 33 and roller 34.Wherein, roller 34 is arranged at ground 4, and continuous pipe 31 is partially disposed in gas injection well 1.Continuous pipe 31
First end (upper end shown in Fig. 1) is placed in outside gas injection well 1, i.e., the first end of continuous pipe 31 is placed on ground 4, and the of continuous pipe 31
One end is rotationally wound in roller 34.The second end (right-hand member shown in Fig. 1) of continuous pipe 31 is movably positioned in gas injection well 1
Interior, specifically, the part that continuous pipe 31 is placed in gas injection well 1 is arranged in the gas injection sleeve pipe of gas injection well 1.The second of continuous pipe 31
End can be only only placed in gas injection well 1, and roller 34 is used to carry out folding and unfolding to continuous pipe 31, so that continuous pipe 31 is in gas injection well 1
It is interior removable.Continuous pipe 31 is used to convey gasifying agent into gas injection well 1.
When it is implemented, continuous pipe 31 can be individual layer, bilayer or sandwich construction, to realize the gasification of a variety of heterogeneities
Injected while agent.
Nozzle 32 is connected with the second end of continuous pipe 31, and nozzle 32 is used for the mixture of gasifying agent, mist in continuous pipe 31
Change and accelerate, and gasifying agent is ejected in target oil reservoir 5.
Injector 33 is arranged at ground 4, also, injector 33 corresponds at the well head of gas injection well 1.Continuous pipe 31 is slidably
Ground is arranged in injector 33, that is to say, that continuous pipe 31 is arranged in injector 33, also, continuous pipe 31 can be relative to injector
About 33 (for Fig. 1) are slided.Injector 33 is used to control position of the continuous pipe 31 in gas injection well 1, specifically, note
Enter device 33 and continuous pipe 31 is transferred into each position to gas injection well 1, and make continuous pipe 31 keep fixing in a certain position.
When it is implemented, gasifying agent injection device 3 can also include：Preventer (not shown), the preventer are set
In ground 4, preventer corresponds at well head, also, the preventer is placed between well head and injector 33, and the preventer is used for
Continuous pipe 31 ensures the seal of gas injection well 1 during movement, avoids gas from leaking.
As can be seen that in the present embodiment, the structure of gasifying agent injection device 3 is simple, is being noted further, it is possible to control exactly
Position in gas well 1, the retrusive movement in gas injection well 1 is better achieved.
With continued reference to Fig. 1 and Fig. 2, in above-described embodiment, gasifying agent injection device 3 can also include：Thermal packer 35.Its
In, Thermal packer 35 is connected to the second end of continuous pipe 31, also, Thermal packer 35 is set close to nozzle 32.Because continuous pipe 31 can
Movably it is placed in gas injection well 1, so continuously there is gap between pipe 31 and gas injection well 1, i.e., in continuous pipe 31 and gas injection well 1
There is gap, Thermal packer 35 is used for closed continuous gap between pipe 31 and gas injection well 1, prevents HTHP between gas injection sleeve pipe
Gas enters the undeveloped oil layer section of gas injection well 1.
Referring to Fig. 1, gas injection well 1 is with producing well 2 to be oppositely arranged, and specifically, gas injection well 1 and producing well 2 are respectively placed in mesh
Left and right (for Fig. 1) both sides of oil reservoir 5 are marked, the horizontal segment of gas injection well 1 is parallel with the horizontal segment of producing well 2.
Referring to Fig. 4, gas injection well 1 is placed in the same side with producing well 2, then gas injection well 1 is set with producing well 2 to be parallel, gas injection
The vertical section of well 1 is parallel with the vertical section of producing well 2, and the horizontal segment of gas injection well 1 is parallel with the horizontal segment of producing well 2.
As can be seen that in the present embodiment, the position of gas injection well 1 and producing well 2 can be oppositely arranged can also be placed in it is same
Side, it is easy to be selected according to actual conditions during construction, is preferably acquired crude oil.
In summary, in the present embodiment, the horizontal segment by gasifying agent injection device 3 in gas injection well 1 by gas injection well 1
Moved at steady tilted section end so that before the injection direction of gasifying agent and combustion front direction of advance are on the contrary, enable to burning
The more balanced burning of edge, avoid the fire that gasifying agent occurs with the combustion reaction of target oil reservoir 5 and alter phenomenon, it also avoid burning and become
In skew the problem of, it is ensured that the safe and stable operation of gas injection well 1, effectively increase controlling extent of the well pattern to stratum, improve
The sweep efficiency of live wire in the plane, also, gasifying agent injection device 3 may move the note for causing gasifying agent in gas injection well 1
Enter position-movable, gas injection position can be adjusted according to reservoir characteristics, effectively ensure that heat involves scope, improves thermal effect
Rate.
Embodiment of the method：
The present embodiment also proposed a kind of thickened oil recovery method, and the thickened oil recovery method is used in said system embodiment
The method that any thickened oil recovery system carries out thickened oil recovery.Wherein, the specific reality in this method on thickened oil recovery system
Process is applied to will not be repeated here referring to described above, the present embodiment.
Referring to Fig. 5, Fig. 5 is the structured flowchart of thickened oil recovery method provided in an embodiment of the present invention.As illustrated, viscous crude is opened
Mining method may include steps of：
Shaft building step S1, respectively by boring gas injection well and producing well in the object-oriented oil reservoir in ground, between gas injection well and producing well
With pre-determined distance；Wherein, gas injection well and producing well are horizontal orientation well, also, gas injection well is placed in target oil with producing well
Part in layer is connected with target oil reservoir.
Specifically, referring to Fig. 1, target oil reservoir 5 can be pre-selected, the vertical section of gas injection well 1 is connected with ground 4, note
The horizontal segment of gas well 1 is placed in target oil reservoir 5, is connected between the vertical section and horizontal segment of gas injection well 1 by steady tilted section, the hold angle
Section is partially disposed in target oil reservoir 5.The part that gas injection well 1 is placed in target oil reservoir 5 is connected with target oil reservoir 5, it is preferred that note
The horizontal segment of gas well 1 is connected with target oil reservoir 5.
The mode that the part that gas injection well 1 is placed in target oil reservoir 5 is connected with target oil reservoir 5 can be：Set in gas injection well 1
Gas injection sleeve pipe is equipped with, the part that gas injection sleeve pipe corresponds to the horizontal segment of gas injection well 1 offers multiple perforates.Specifically, the gas injection set
Pipe can be screen casing corresponding to the part of the horizontal segment of gas injection well 1, and screen casing can be cutting seam sieve tube or wire-wrapped screen, be preferably
Cutting seam sieve tube.The material of screen casing can be fiberglass.Can also, gas injection sleeve pipe is corresponded to by the water of gas injection well 1 by perforating system
The part of flat section opens up multiple perforates.
Referring to Fig. 1, gasifying agent injection device 3 can be set, the gasifying agent injection device 3 is movably put in gas injection well 1
In in gas injection well 1, gasifying agent injection device 3 can be from the end (right-hand member shown in Fig. 1) of the horizontal segment of gas injection well 1 to gas injection well 1
Steady tilted section (left end shown in Fig. 1) place movement, gasifying agent injection device 3 be used for convey gasifying agent into gas injection well 1.Gasifying agent
Transfer position be from the end of the horizontal segment of gas injection well 1 to the steady tilted section of gas injection well 1 at progressively convey.Gasifying agent includes：Oxygen
Gas and water steam, water, carbon dioxide, air etc..
The vertical section of producing well 2 is connected with ground 4, and the horizontal segment of producing well 2 is placed in target oil reservoir 5, producing well 2
Connected between vertical section and horizontal segment by steady tilted section, the steady tilted section is partially disposed in target oil reservoir 5.Producing well 2 is placed in target
Part in oil reservoir 5 is connected with target oil reservoir 5, it is preferred that the horizontal segment of producing well 2 is connected with target oil reservoir 5.Producing well
2 crude oil being used for around collection, when it is implemented, can be provided with oil production equipment 6 in producing well 2, the collection of oil production equipment 6 is recovered the oil
Crude oil around well 2.
The mode that the part that producing well 2 is placed in target oil reservoir 5 is connected with target oil reservoir 5 can be：Set in producing well 2
Long string is equipped with, the part that long string corresponds to the horizontal segment of producing well 2 offers multiple perforates.Specifically, the oil recovery set
Pipe can be screen casing corresponding to the part of the horizontal segment of producing well 2, preferably connected with target oil reservoir 5 with forming duct, be easy to connect
Receive more crude oil and reacting gas.Screen casing can be cutting seam sieve tube or wire-wrapped screen, preferably cutting seam sieve tube.Screen casing
Material can be fiberglass.Can also, the part that long string is corresponded to horizontal segment by perforating system opens up multiple perforates.
Referring to Fig. 1, gas injection well 1 is with producing well 2 to be oppositely arranged, and specifically, gas injection well 1 and producing well 2 are respectively placed in mesh
Left and right (for Fig. 1) both sides of oil reservoir 5 are marked, the horizontal segment of gas injection well 1 is parallel with the horizontal segment of producing well 2.
Referring to Fig. 4, gas injection well 1 is placed in the same side with producing well 2, then gas injection well 1 is set with producing well 2 to be parallel, gas injection
The vertical section of well 1 is parallel with the vertical section of producing well 2, and the horizontal segment of gas injection well 1 is parallel with the horizontal segment of producing well 2.
Infiltration lane step S2 is established, infiltration lane is established between gas injection well and producing well.
Specifically, producing well 2 is placed in the lower section (for Fig. 1) of gas injection well 1, and producing well 2 is placed in target oil reservoir 5
Part and gas injection well 1 be placed between the part in target oil reservoir 5 there is pre-determined distance, the pre-determined distance is used to cause producing well
Infiltration lane is formed between 2 and gas injection well 1, the infiltration lane is used to make producing well 2 with gas injection well 1 be connected.
Referring to Fig. 6, Fig. 6 is the structured flowchart that impregnation step is established in thickened oil recovery method provided in an embodiment of the present invention.
It may include steps of as illustrated, establishing infiltration lane：
Step S21, into gas injection well and producing well, injection has the steam of preset temperature respectively, to heat target oil reservoir.
Specifically, because steam has preset temperature, so the horizontal segment and producing well of gas injection well 1 can be made by heat transfer
Oil reservoir around 2 horizontal segment is heated.
When it is implemented, in warm-up phase, speed, preheating steam injection mass dryness fraction, the preheating steam injection annular space pressure of preheating injection steam
Power, steam injection pressure difference apply the major parameter that opportunity and size etc. are warm-up phases.In the present embodiment, steam injection rate 80m3/
D, steam quality 70%, steam injection pressure depend on oil reservoir initial pressure, in the present embodiment, steam injection pressure 2.5MPa.
Step S22, the pressure in gas injection well is lifted, so that the original between the horizontal segment of gas injection well and the horizontal segment of producing well
Oil flows to producing well, and the passage of crude oil flow is infiltration lane.
Specifically, continue to inject a certain amount of steam into gas injection well 1, to lift the pressure in gas injection well 1 so that gas injection
Pressure in well 1 is slightly above the pressure in producing well 2, pressure difference between well so, between gas injection well 1 and producing well 2 is formed, between the well
Pressure difference causes the crude oil between two wells to flow to producing well 2, i.e. crude oil between the horizontal segment of gas injection well 1 and the horizontal segment of producing well 2
Producing well 2 is flowed to, the passage of the crude oil flow is infiltration lane.
Step S23, stop injecting steam into gas injection well and producing well.
Reactions steps S3, lights the crude oil of the end of the horizontal segment of gas injection well, and injects gasifying agent, gasifying agent and crude oil
Carry out reaction to produce reacting gas and discharge heat, crude oil is under the driving of thermodynamic activity and reacting gas through permeability channel flows
To producing well.
Specifically, gasifying agent injection device 3 is put into gas injection well 1, gasifying agent injection device 3 is positioned over apart from gas injection
At a certain distance from the end of the horizontal segment of well 1.Gasifying agent injection device 3 injects the gasification with preset temperature into gas injection well 1
Agent, using the temperature of gasifying agent the Crude Oil of target oil reservoir 5 is heated.Crude oil after heating is ignited, gasifying agent injection is set
Standby 3 are continually fed into gasifying agent, and by adjusting the input quantity of gasifying agent, cultivate combustion zone 7, until oil reservoir burning tends towards stability.
When it is implemented, the mode that crude oil ignites can use forced oxidation and ignition, silane igniting, electric ignition etc., this reality
Example is applied to be not intended to be limited in any this.Wherein, forced oxidation and ignition is to cause crude oil to be heated rear temperature using the temperature of gasifying agent
Degree is gradually risen to self-ignition point, and then the oil reservoir that ignites.Silane igniting is that silane and air spontaneous combustion produce heat and ignited oil reservoir.
After oil reservoir burning tends towards stability, temperature field as shown in Figures 2 and 3 is formed in target oil reservoir 5, substantially can be with
It is divided into combustion zone 7, coking area 8 and moveable oil area 9.Wherein, combustion zone 7 is the main region for producing heat, and injection target is oily
In combustion zone 7 and crude oil combustion reaction, i.e. C+O occur for the oxygen in gasifying agent in layer 52→CO2, combustion reaction by target oil
Part crude oil in layer 5 is burnt up and discharges heat, and the temperature in the region is typically at 900~1100 DEG C.The heat of combustion zone 7 to
Surrounding oil reservoir transmission, the leading edge against combustion zone 7 are coking area 8, and the combustion reaction of combustion zone 7 release is utilized in coking area 8
Heat carries out gasification reaction, i.e. C+H2O→CO+H2、C+CO2→2CO、C+2H2→CH4, and carry out pyrolytic reaction, i.e. macromolecular
Hydrocarbon pyrolysis, generation coke, the hydro carbons and gas of small molecule, such as CH4、C2H4Deng.Therefore, the master of the reaction generation in coking area 8
It is CO to want composition2And water vapour, and small part fuel gas such as CH4, CO and H2Deng high-temperature gas, wherein, water vapour comes from mesh
The water vapour that the absorption water contained in mark oil reservoir 5 is thermally generated in advance, the temperature in the region are typically in the range of 300~900 DEG C.Reaction produces
Heat transmitted under thermograde and pressure effect in target oil reservoir 5 so that the underground water in reservoir is formed by thermal evaporation
Vapor chamber, the viscosity that is heated of the crude oil in target oil reservoir 5 decline, and mobility greatly improves, also, underground water is by thermogenetic steam
It can play a part of being driven crude oil.Meanwhile the small molecule oil-gas migration that the thermal cracking of coking area 8 is formed is to moveable oil area
9, the temperature in moveable oil area 9 is less than 300 DEG C.In moveable oil area 9, the mobility of the mixture of small molecule oil gas and crude oil is significantly
Improve, because producing well 2 is placed in the lower section of gas injection well 1, so, crude oil is through permeability channel flows in the presence of heating power and gravity
To producing well 2.
When it is implemented, before oil reservoir spontaneous combustion, the preset temperature for the gasifying agent that gasifying agent injection device 3 is passed through is 350 DEG C, stream
Measure as 300~600Nm3/ h, the temperature of oil reservoir self-ignition point are generally 200~220 DEG C.After oil reservoir burning tends towards stability, gasifying agent
Flow control in 600~2000Nm3/ h, oxygen concentration control is 21~60%, and the gas injection pressure of gasifying agent is according to reservoir pressure
Power determines.
Oil recovery step S4, the oil around producing well is gathered, and be delivered to ground.
Specifically, the oil production equipment 6 in producing well 2 constantly takes out reacting gas caused by the crude oil around recovering the oil and reaction
Drain into ground 4.When it is implemented, producing well 2 can be the mode modes such as lifting, sucker rod pumping to the row's of adopting mode of crude oil.
Oil gas separation equipment is also provided with producing well 2, the oil gas separation equipment is used to enter the crude oil of collection with reacting gas
Row separation, and then it is easy to the collection and discharge of reacting gas.
Cooling medium can be injected into producing well 2 according to actual conditions, to reduce the temperature of producing well 2, avoid adopting
Long string in oil well 2 is burnt out or coking.Cooling medium can be steam, water, hydrogen, hydro carbons etc..
After the oil firing of the end of the horizontal segment of gas injection well in reactions steps, to the end of the horizontal segment of gas injection well
Next opening position injects gasifying agent, repeats above-mentioned reactions steps and oil recovery step, until the injection phase of gasifying agent is by gas injection
The end of the horizontal segment of well, which is moved at the steady tilted section of gas injection well, stops injection gasifying agent (according to the direction of arrow shifting shown in Fig. 1
It is dynamic).
Specifically, at crude oil flow to the producing well 2 of the horizontal segment end of gas injection well 1 and after collected, gasifying agent is noted
The position for entering equipment 3 is moved to the left next gas injection position, in the new gas injection position, continues to inject gasifying agent, in repetition
Operation is stated, the crude oil of new gas injection opening position is driven and gathered.The position of gasifying agent injection device 3 is by the water of gas injection well 1
The end of the flat section gradually movement to retrusive at the steady tilted section of gas injection well 1 (according to the direction of arrow movement shown in Fig. 1), until moving
Move to stopping injection gasifying agent at the steady tilted section of gas injection well 1, then the displacement of reservoir oil and the process recovered the oil finish.
When it is implemented, the moving direction of gasifying agent injection device 3 moves for retrusive, and the note of gasifying agent injection device 3
The direction of the gasifying agent entered is opposite with the moving direction of gasifying agent gas injection equipment 3, that is to say, that gasifying agent injection device 3 exists
The direction of the gasifying agent injected at any position is forward (opposite with the direction of arrow shown in Fig. 1).However, gasifying agent injects
The moving direction of equipment 3 is (to be moved backward according to the direction of arrow shown in Fig. 1), and the crude oil in target oil reservoir 5 is burnt
When burning direction be also then overall in opposite direction, the production of the injection direction of gasifying agent and combustion front or combustion zone backward
The effect of reverse combustion has been given birth to, has enabled to the burning that combustion front is more balanced, gasifying agent has been avoided and is burnt with target oil reservoir 5
The fire that reaction occurs alters phenomenon, it also avoid the problem of burning tends to skew.
When it is implemented, gasifying agent injection device 3 is positioned over 0~20m apart from the horizontal segment end of gas injection well 1 first,
It is 5m in the present embodiment.The position of gasifying agent injection device 3 is from the end of the horizontal segment of gas injection well 1 gradually to the steady tilted section of gas injection well 1
In the moving process for locating retrusive, retreat mobile distance and be generally 0~50m, be in the present embodiment 15m.
, can be by adjusting the flow of the gasifying agent injected, gasifying for the inhomogeneity of oil reservoir during reaction
Agent pressure, oxygen concentration, water-carrying capacity etc., to maintain the scope of combustion zone 7, temperature, heat and heat loss, and control to maintain crude oil
The region in moveable oil area 9, until the crude oil near the gas injection position is completed by flowing displacement, oil recovering can be effectively improved
Rate.
When it is implemented, can arrange peupendicular hole in the both sides of gas injection well 1, the peupendicular hole is used for auxiliary into target oil reservoir 5
Help injection gasifying agent.Peupendicular hole can also be arranged in the both sides of producing well 2, the peupendicular hole is used for assisted acquisition crude oil.
As can be seen that in the present embodiment, by the injection phase of gasifying agent from gas injection well horizontal segment end to hold angle
Moved at section, enable to the injection direction of gasifying agent opposite with combustion front direction of advance so that combustion front is more balanced
Burning, avoid the fire that gasifying agent and the combustion reaction of target oil reservoir occur and alter phenomenon, it is ensured that the safety and stability fortune of gas injection well
OK, controlling extent of the well pattern to stratum is effectively increased, improves the sweep efficiency of live wire in the plane, also, gasifying agent
Injection phase is removable to adjust gas injection position according to reservoir characteristics, effectively ensure that heat involves scope, improves thermal effect
Rate.
Referring to Fig. 1 to Fig. 3, in above-described embodiment, in shaft building step S1, the horizontal segment of producing well is placed in the pre- of target oil reservoir
If opening position, specifically, the horizontal segment of producing well 2 is close to the position of the bottom of target oil reservoir 5.When it is implemented, the predeterminated position
It can be determined according to actual conditions, the present embodiment is not intended to be limited in any to this.
The horizontal segment of producing well is placed in the lower section (for Fig. 1) of the horizontal segment of gas injection well, also, the water of producing well
There is pre-determined distance, the pre-determined distance refers to vertical range between flat section and the horizontal segment of gas injection well.The pre-determined distance can be with
It is determined according to oil reservoir and recovery features, generally 2~20m, in the present embodiment, the pre-determined distance is 10m.Specific implementation
When, infiltration lane is established between the horizontal segment of gas injection well 1 and the horizontal segment of producing well 2.
The horizontal segment of gas injection well 1 is placed in target oil reservoir 5, also, the horizontal segment of gas injection well 1 is connected with target oil reservoir 5.
Meanwhile the horizontal segment of producing well 2 is placed in target oil reservoir 5, also, the horizontal segment of producing well 2 is connected with target oil reservoir 5, this
Sample, it is easy to infiltration lane to be established between the horizontal segment of gas injection well 1 and the horizontal segment of producing well 2, and then causes in target oil reservoir 5
Crude oil can under gravity and thermodynamic activity preferably through permeability channel flows to producing well 2 at.
During construction, can first from ground 4 into target oil reservoir 5 drilling oil well 2, then carry out construct gas injection well 1, using magnetic
Guidance system is by the TRAJECTORY CONTROL of the horizontal segment of gas injection well 1 in setting range.The setting range can according to actual conditions come
It is determined that the present embodiment does not do any restrictions to this.
As can be seen that in the present embodiment, the horizontal segment of gas injection well is placed in the top of the horizontal segment of producing well, so, gas injection
Jing Chu crude oil be easy to after being reacted with gasifying agent under gravity through permeability channel flows to producing well at, be easy to crude oil
Flowing, also, the horizontal segment of producing well is placed in the predetermined position of target oil reservoir, can maximally utilise gravity drainage
Height, be easy at the crude oil flow in target oil reservoir to producing well.
It should be noted that the thickened oil recovery system and thickened oil recovery Method And Principle in the present invention are identical, related part can
With cross-referenced.
In summary, in the present embodiment, by the injection phase of gasifying agent from gas injection well horizontal segment end to hold angle
Moved at section so that the injection direction of gasifying agent is opposite with combustion front direction of advance so that the more balanced combustion of combustion front
Burn, avoid the fire that gasifying agent occurs with the combustion reaction of target oil reservoir and alter phenomenon, it is ensured that the safe and stable operation of gas injection well, have
Effect improves controlling extent of the well pattern to stratum, improves the sweep efficiency of live wire in the plane, also, the injection position of gasifying agent
Put and may move and can adjust gas injection position according to reservoir characteristics, effectively ensure that heat involves scope, improves the thermal efficiency.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (11)
- A kind of 1. thickened oil recovery system, it is characterised in that including：Gas injection well (1), producing well (2) and gasifying agent injection device (3)；Wherein,The gas injection well (1) is horizontal directional drilling, and the gas injection well (1) is worn into target oil reservoir (5) by ground (4), institute State gasifying agent injection device (3) to be movably positioned in the gas injection well (1), the gasifying agent injection device (3) is by the note Moved at the steady tilted section of the gas injection well (1) end of the horizontal segment of gas well (1)；The producing well (2) is horizontal directional drilling, and the producing well (2) is worn to the target oil reservoir (5) by ground (4) In, the producing well (2) is placed in the lower section of the gas injection well (1), also, between the producing well (2) and the gas injection well (1) With pre-determined distance, part that the gas injection well (2) and the producing well (2) are placed in the target oil reservoir (5) with it is described Target oil reservoir (5) is connected.
- 2. thickened oil recovery system according to claim 1, it is characterised in thatThe horizontal segment of the producing well (2) is placed in the predetermined position of the target oil reservoir (5)；The horizontal segment of the producing well (2) is placed in the lower section of the horizontal segment of the gas injection well (1), also, the producing well (2) There is pre-determined distance between the horizontal segment of horizontal segment and the gas injection well (1)；The horizontal segment of the gas injection well (1) and the horizontal segment of the producing well (2) be placed in the target oil reservoir (5) and with The target oil reservoir (5) is connected.
- 3. thickened oil recovery system according to claim 2, it is characterised in thatGas injection sleeve pipe is provided with the gas injection well (1), the gas injection sleeve pipe corresponds to the part of the gas injection well (1) horizontal segment Offer multiple perforates；And/orLong string is provided with the producing well (2), the long string corresponds to the part of the producing well (2) horizontal segment Offer multiple perforates.
- 4. thickened oil recovery system according to claim 3, it is characterised in thatThe part that the gas injection sleeve pipe corresponds to the gas injection well (1) horizontal segment is screen casing；And/orThe part that the long string corresponds to the producing well (2) horizontal segment is screen casing.
- 5. thickened oil recovery system according to claim 1, it is characterised in that the gasifying agent injection device (3) includes：Even Continuous pipe (31), nozzle (32), the injector (33) and roller (34) for being placed in ground (4)；Wherein,The first end of the continuous pipe (31) is rotationally wound in the roller (34), and the second end of the continuous pipe (31) can Movably it is placed in the gas injection well (1), the nozzle (32) is connected to the second end of the continuous pipe (31)；The continuous pipe (31) is slideably arranged in the injector (33), and the injector (33) is described continuous for controlling Manage the position of (31) in the gas injection well (1).
- 6. thickened oil recovery system according to claim 5, it is characterised in that the gasifying agent injection device (3) also includes： Thermal packer (35)；Wherein,The Thermal packer (35) is connected to the second end of the continuous pipe (31) and set close to the nozzle (32).
- 7. thickened oil recovery system according to claim 1, it is characterised in thatThe gas injection well (1) is oppositely arranged with the producing well (2)；OrThe gas injection well (1) is placed in the same side with the producing well (2).
- A kind of 8. thickened oil recovery method, it is characterised in that comprise the following steps：Shaft building step, respectively by boring gas injection well and producing well in the object-oriented oil reservoir in ground, the gas injection well and the producing well it Between there is pre-determined distance；Wherein, the gas injection well and the producing well are horizontal orientation well, also, the gas injection well and institute The part that producing well is placed in the target oil reservoir is stated with the target oil reservoir to be connected；Infiltration lane step is established, infiltration lane is established between the gas injection well and the producing well；Reactions steps, light the crude oil of the end of the horizontal segment of the gas injection well, and inject gasifying agent, and gasifying agent enters with crude oil Row reaction produces reacting gas and discharges heat, and the crude oil oozes under the driving of thermodynamic activity and the reacting gas through described Saturating passage is flowed at the producing well；Oil recovery step, the crude oil around the producing well is gathered, and be delivered to ground；After the burning crude oil of the end of the horizontal segment of the gas injection well described in the reactions steps, to the level of the gas injection well Next opening position injection gasifying agent of section, repeats above-mentioned reactions steps and oil recovery step, until the injection position of the gasifying agent Put the steady tilted section stopping injection gasifying agent that the gas injection well is moved to by the end of the horizontal segment of the gas injection well.
- 9. thickened oil recovery method according to claim 8, it is characterised in that in the shaft building step,The horizontal segment of the producing well is placed in the predetermined position of the target oil reservoir；The horizontal segment of the producing well is placed in the lower section of the horizontal segment of the gas injection well, also, the horizontal segment of the producing well with There is pre-determined distance between the horizontal segment of the gas injection well；The horizontal segment of the horizontal segment of the gas injection well and the producing well be placed in the target oil reservoir and with the target Oil reservoir is connected.
- 10. thickened oil recovery method according to claim 8, it is characterised in that the impregnation step of establishing further comprises：Steam of the injection with preset temperature into the gas injection well and the producing well respectively, to heat the target oil reservoir；The pressure in the gas injection well is lifted, so that the original between the horizontal segment of the horizontal segment of the gas injection well and the producing well For oil to flowing at the producing well, the passage of the crude oil flow is the infiltration lane；Stop injecting steam into the gas injection well and the producing well.
- 11. thickened oil recovery method according to claim 8, it is characterised in that in the oil recovery step, to the producing well Middle injection cooling medium.
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Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888382A (en) * | 2006-07-19 | 2007-01-03 | 尤尼斯油气技术（中国）有限公司 | Deep low penetrating oil layer thin oil fire flooding horizontal well gas-injection horizontal well oil production process technology |
| CN102628350A (en) * | 2012-04-20 | 2012-08-08 | 中国石油天然气股份有限公司 | Propane-injecting shallow heavy oil reservoir exploitation method |
| CN202483541U (en) * | 2012-03-28 | 2012-10-10 | 周志斌 | Oil production system for heavy oil reservoir |
| CN102900415A (en) * | 2012-09-25 | 2013-01-30 | 中国石油天然气股份有限公司 | Method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage |
| CN103291244A (en) * | 2013-06-21 | 2013-09-11 | 沈阳摩根能源装备有限公司 | Method for compensating thermal energy of horizontal well mining heavy oil reservoirs in large power and subsection mode in pit |
| CN103939071A (en) * | 2014-04-16 | 2014-07-23 | 中国石油天然气股份有限公司 | Horizontal well steam flooding well network structure and steam flooding method |
| CN104251133A (en) * | 2013-06-26 | 2014-12-31 | 新奥气化采煤有限公司 | Controllable gas injection point gas injection device, gas injection technology and gasification method |
| CA2888892A1 (en) * | 2014-04-22 | 2015-10-22 | Ryan Miller | Non condensing gas management in sagd |
| CN105422060A (en) * | 2015-11-19 | 2016-03-23 | 中国石油天然气股份有限公司 | Intermittent flue gas-drive oil production method |
| CN105649588A (en) * | 2014-11-12 | 2016-06-08 | 中国石油天然气股份有限公司 | Method for exploiting heavy oil reservoir through steam-assisted gravity drainage (SAGD) |
| CN105971576A (en) * | 2016-07-11 | 2016-09-28 | 北京普新石油技术开发有限公司 | Method for exploiting extra-heavy oil or super-heavy oil in fireflood-assisted gravity oil drainage mode of horizontal wells |
| CN106168119A (en) * | 2016-08-15 | 2016-11-30 | 中国石油天然气股份有限公司 | Downhole electric heating horizontal production well tubular column structure |
| CN107013197A (en) * | 2017-05-19 | 2017-08-04 | 中国石油集团川庆钻探工程有限公司 | The dual horizontal well of viscous crude containing interlayer SAGD develops drilling completion method |
-
2017
- 2017-08-28 CN CN201710751864.0A patent/CN107558978A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1888382A (en) * | 2006-07-19 | 2007-01-03 | 尤尼斯油气技术（中国）有限公司 | Deep low penetrating oil layer thin oil fire flooding horizontal well gas-injection horizontal well oil production process technology |
| CN202483541U (en) * | 2012-03-28 | 2012-10-10 | 周志斌 | Oil production system for heavy oil reservoir |
| CN102628350A (en) * | 2012-04-20 | 2012-08-08 | 中国石油天然气股份有限公司 | Propane-injecting shallow heavy oil reservoir exploitation method |
| CN102900415A (en) * | 2012-09-25 | 2013-01-30 | 中国石油天然气股份有限公司 | Method for mining deep and ultra-deep thick oil pools by using double horizontal well fire flooding drainage |
| CN103291244A (en) * | 2013-06-21 | 2013-09-11 | 沈阳摩根能源装备有限公司 | Method for compensating thermal energy of horizontal well mining heavy oil reservoirs in large power and subsection mode in pit |
| CN104251133A (en) * | 2013-06-26 | 2014-12-31 | 新奥气化采煤有限公司 | Controllable gas injection point gas injection device, gas injection technology and gasification method |
| WO2014206122A1 (en) * | 2013-06-26 | 2014-12-31 | 新奥气化采煤有限公司 | Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method |
| CN103939071A (en) * | 2014-04-16 | 2014-07-23 | 中国石油天然气股份有限公司 | Horizontal well steam flooding well network structure and steam flooding method |
| CA2888892A1 (en) * | 2014-04-22 | 2015-10-22 | Ryan Miller | Non condensing gas management in sagd |
| CN105649588A (en) * | 2014-11-12 | 2016-06-08 | 中国石油天然气股份有限公司 | Method for exploiting heavy oil reservoir through steam-assisted gravity drainage (SAGD) |
| CN105422060A (en) * | 2015-11-19 | 2016-03-23 | 中国石油天然气股份有限公司 | Intermittent flue gas-drive oil production method |
| CN105971576A (en) * | 2016-07-11 | 2016-09-28 | 北京普新石油技术开发有限公司 | Method for exploiting extra-heavy oil or super-heavy oil in fireflood-assisted gravity oil drainage mode of horizontal wells |
| CN106168119A (en) * | 2016-08-15 | 2016-11-30 | 中国石油天然气股份有限公司 | Downhole electric heating horizontal production well tubular column structure |
| CN107013197A (en) * | 2017-05-19 | 2017-08-04 | 中国石油集团川庆钻探工程有限公司 | The dual horizontal well of viscous crude containing interlayer SAGD develops drilling completion method |
Non-Patent Citations (3)
| Title |
|---|
| 刘其成等: "超稠油油藏火驱辅助重力泄油技术实验研究", 《特征油气藏》, vol. 20, no. 1, pages 84 - 87 * |
| 姜兴玲: "双水平井SAGD循环预热工艺研究与应用" * |
| 陈森等: "双水平井SAGD循环预热技术及现场应用", vol. 8 * |
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