CN106761626A - Dual horizontal well superheated steam assisted gravity drainage well pattern and recovery method - Google Patents
Dual horizontal well superheated steam assisted gravity drainage well pattern and recovery method Download PDFInfo
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- CN106761626A CN106761626A CN201611095956.XA CN201611095956A CN106761626A CN 106761626 A CN106761626 A CN 106761626A CN 201611095956 A CN201611095956 A CN 201611095956A CN 106761626 A CN106761626 A CN 106761626A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention provides a kind of dual horizontal well superheated steam assisted gravity drainage well pattern and recovery method, the dual horizontal well superheated steam assisted gravity drainage well pattern includes first level well (10) and the second horizontal well (20), first level well (10) is contained within the first long string (11) and the first short string (12), and the second horizontal well (20) is contained within the second long string (21) and the second short string (22).The dual horizontal well superheated steam assisted gravity drainage well pattern and recovery method use superheated steam assisted gravity drainage, it is solved during wet saturated steam is injected, heat utilization efficiency is low, gas oil ratio is low and the problems such as reservoir damage, improve heat utilization efficiency, gas oil ratio is improve, the development effectiveness of super-heavy oil deposit and oil-sand reservoir is improve.
Description
Technical field
The present invention relates to technical field of petroleum extraction, a kind of particularly dual horizontal well superheated steam assisted gravity drainage well
Net, or a kind of dual horizontal well superheated steam assisted gravity drainage recovery method.
Background technology
When Oil Field uses SAGD, injection steam quality does not reach 100%, and steam is by boiler
Export to up to the heat loss in bottom process, cause some vapor to be condensed into hot water after reaching shaft bottom, cause gas oil ratio relatively low, shadow
Effective extension of SAGD vapor chambers is rung.Simultaneously as the flow at high speed of steam easily causes particle migration and makes during SAGD
Venturi is blocked, and the steam condensate (SC) and Clay Mineral for being injected into stratum are contacted and easily trigger mineral expansion, therefore wet
The long-term injection of saturated vapor can form a certain degree of injury to reservoir, influence reservoir properties of pore and permeability so that SAGD exploitation effects
Fruit is deteriorated.
The content of the invention
It is low in order to solve the problems, such as existing SAGD efficiency, the invention provides a kind of dual horizontal well overheat
SAGD well pattern and recovery method, the dual horizontal well superheated steam assisted gravity drainage well pattern and recovery method are adopted
Use superheated steam assisted gravity drainage, it solve inject wet saturated steam during, heat utilization efficiency is low, gas oil ratio is low and
The problems such as reservoir damage, heat utilization efficiency is improve, improve gas oil ratio, improve super-heavy oil deposit and imitated with the exploitation of oil-sand reservoir
Really.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of dual horizontal well superheated steam assisted gravity drainage well pattern, including first level well and the second horizontal well, first
The horizontal segment of horizontal well is located at the top of the horizontal segment of the second horizontal well, and first level well is steam injection well, and the second horizontal well is to adopt
Oil well, first level well is contained within the first long string and the first short string, and the first long string is steam injection string, the first long string
Steam injection position is corresponding with the tiptoe of the horizontal segment of first level well, the end of the first short string and the horizontal segment of first level well
Heel it is corresponding, the segment fluid flow in first level well can be discharged by the first short string, and the second horizontal well is contained within
Two long strings and the second short string, the second long string are Multipurpose pipe column, and the second long string being capable of steam injection, the note of the second long string
Vapour position is corresponding with the tiptoe of the horizontal segment of the second horizontal well, the horizontal segment of the end of the second short string and the second horizontal well
Heel is corresponding, and the segment fluid flow in the second horizontal well can be discharged by the second short string.
A kind of dual horizontal well superheated steam assisted gravity drainage recovery method, comprises the following steps：
Step 1, well net deployment；
The above-mentioned dual horizontal well superheated steam assisted gravity drainage well pattern of deployment；
Step 2, circulation preheating；
Make steam respectively in first level well and the second horizontal well interior circulation, until first level well and the second horizontal well it
Between reach thermal communication；
Step 3, production；
To superheated steam is injected in first level well, by the second horizontal well production.
The beneficial effects of the invention are as follows：
1st, the superheated steam amount for needing is smaller than wet saturated steam amount, improves gas oil ratio, considerably reduces steam cost
Improve exploitation effect.
2nd, when steam injection amount is identical, superheated steam well has shaft bottom mass dryness fraction higher, bigger heating radius, its volume increase effect
Fruit is also more obvious.
3rd, superheated steam has heat content and bigger specific volume higher, and original aqueous water is evaporated in making reservoir, crude oil
Can preferably be contacted with superheated steam, steam distillation effect is remarkably reinforced.
4th, reservoir is soaked for water, the moisture evaporation in rock surface, hole can show certain displacement effect so that
The crude oil of roundabout shape distribution is easier to be displaced, and oil displacement efficiency is greatly increased.
5th, superheated steam has obvious repair to the reservoir that strong retraction has occurred, and can obviously improve Reservoir Seepage ring
Border.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing a further understanding of the present invention, of the invention to show
Meaning property and its illustrates, for explaining the present invention, not constitute inappropriate limitation of the present invention embodiment.
Fig. 1 is the structural representation of dual horizontal well superheated steam assisted gravity drainage well pattern.
Fig. 2 is the schematic diagram of the dual horizontal well superheated steam assisted gravity drainage.
Fig. 3 is the tired steam injection correlation curves of SH-SAGD and routine SAGD.
Fig. 4 is SH-SAGD and SAGD days steam injection correlation curve of routine.
Fig. 5 is SH-SAGD and routine SAGD iOSR correlation curves.
Fig. 6 is the tired oil-producing correlation curves of SH-SAGD and routine SAGD.
10th, first level well；11st, the first long string；12nd, the first short string；13rd, tubing string is extended；14th, the first slot sieve
Pipe；
20th, the second horizontal well；21st, the second long string；22nd, the second short string；23rd, screw pump；24th, the second cutting seam sieve tube.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application can phase
Mutually combination.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
A kind of dual horizontal well superheated steam assisted gravity drainage well pattern, including the horizontal well 20 of first level well 10 and second,
The horizontal segment of first level well 10 is located at the top of the horizontal segment of the second horizontal well 20, and first level well 10 is steam injection well, second
Horizontal well 20 is producing well, and first level well 10 is contained within the first long string 11 and the first short string 12, and the first long string 11 is
Steam injection string, the steam injection position of the first long string 11 is corresponding with the tiptoe of the horizontal segment of first level well 10, the first short string
12 end is corresponding with the heel of the horizontal segment of first level well 10, and the fluid in first level well 10 can be short by first
Tubing string 12 is discharged, and the second horizontal well 20 is contained within the second long string 21 and the second short string 22, and the second long string 21 is multipurpose
Tubing string, the second long string 21 being capable of steam injection, the tiptoe of the horizontal segment of the steam injection position of the second long string 21 and the second horizontal well 20
Corresponding, the end of the second short string 22 is corresponding with the heel of the horizontal segment of the second horizontal well 20, in the second horizontal well 20
Fluid can be discharged by the second short string 22, as shown in Figure 1.
In the present embodiment, the horizontal segment of the horizontal segment of first level well 10 and the second horizontal well 20 is parallel to each other, and first
The distance between horizontal segment of the horizontal segment of horizontal well 10 and the second horizontal well 20 is 5m, the horizontal segment distance of the second horizontal well 20
The horizontal section length of oil reservoir bottom 2m, the horizontal segment of first level well 10 and the second horizontal well 20 is 850m.First level well
10 and the second horizontal well 20 constitute a well pair, with other wells to the distance between be 125m.
In the present embodiment, the end of the first short string 12 is provided with extension tubing string 13, and the end of the second short string 22 is provided with
Screw pump 23.The first cutting seam sieve tube 14 is provided with the horizontal segment of first level well 10, the first long string 11 is sieved positioned at the first slot
In pipe 14, the second cutting seam sieve tube 24 is provided with the horizontal segment of the second horizontal well 20, the second long string 21 is located at the second cutting seam sieve tube
In 24.
In the present embodiment, steam will down inject the first long string 11 and the second long string 21, then by slot tail
Pipe (the first cutting seam sieve tube 14 and the second cutting seam sieve tube 24) enters oil reservoir.First long string 11 and the second long string 21 are provided with temperature
Degree and pressure-measuring instrument, the measuring instrument under coiled tubing by entering to net horizontal section.These measuring instruments are included along water
The single or multiple thermometers of flat section, and at least one pressure monitoring meter near afterbody, for monitoring pump performance.
A kind of dual horizontal well superheated steam assisted gravity drainage (SH-SAGD) recovery method, the recovery method is described below
Comprise the following steps：
Step 1, well net deployment；
The above-mentioned dual horizontal well superheated steam assisted gravity drainage well pattern of deployment, as shown in Figure 1；
Step 2, circulation preheating；
Make steam respectively in the interior circulation of 10 and second horizontal well of first level well 20, until the water of first level well 10 and second
Thermal communication is reached between horizontal well 20；
Step 3, production；
To superheated steam is injected in first level well 10, recovered the oil by the second horizontal well 20, realize superheated steam auxiliary weight
Power draining (SH-SAGD), as depicted in figs. 1 and 2.
In the present embodiment, the dual horizontal well superheated steam assisted gravity drainage well net deployment in depth be 160m~
In the oil reservoir of 180m, the average effective caliper of the oil reservoir is 18m, and the average oil saturation of the oil reservoir is
75%, the effecive porosity of the oil reservoir is 32%, 4 μm of the permeability average out to of the oil reservoir2~5 μm2, oil reservoir storage
The vertical permeability of layer is 0.6~1.0 with the ratio of horizontal permeability.
In step 2, i.e., in the circulation preheating, the first long string 11 is in first level well 10 while steam injection
Second long string 21 to steam injection in the second horizontal well 20, i.e., is all now long string in the horizontal well 20 of first level well 10 and second
Steam injection short string is discharged, and the temperature of steam injection is 212 DEG C.Because the pressure in first level well 10 is larger, in first level well 10
Segment fluid flow can be discharged by the end (heel i.e. with first level well 10 is corresponding) of the first short string 12, due to the
Pressure in two horizontal wells 20 is larger, and the segment fluid flow in the second horizontal well 20 can be by the end of the second short string 22 (i.e.
Heel with the second horizontal well 20 is corresponding) to discharge, the now effect of the first short string 12 and the second short string 22 is pressure release,
Screw pump 23 does not work.
In step 2, when the temperature at midpoint position between circulation preheating first level well 10 and the second horizontal well 20 reaches
The thermal communication is realized at 75 DEG C~95 DEG C, the next step production oil recovery stage can be transferred to.
In step 3, the temperature for injecting the superheated steam is 300 DEG C~550 DEG C.It is preferably injected the superheated steam
Temperature is 350 DEG C, 400 DEG C, 450 DEG C or 500 DEG C.Subcool is maintained in production process in 5 DEG C~15 DEG C (subcool：Production
The difference of saturated-steam temperature and fluid actual temperature corresponding to well flowing bottomhole pressure (FBHP)), when instantaneous steam oil ratio (SOR) (iSOR) reaches 6
When, production terminates.
Compared with common saturated vapor, superheated steam has heat content and bigger specific volume higher, can discharge heat, makes
Original aqueous water is evaporated in reservoir, and crude oil can be contacted preferably with superheated steam, and steam distillation effect is remarkably reinforced.For
Water soaks reservoir, and the moisture evaporation in rock surface, hole can show certain displacement effect so that the original of roundabout shape distribution
Oil is easier to be displaced, thus oil displacement efficiency is greatly increased.And superheated steam has bright to the stratum that strong retraction injury has occurred
Aobvious repair, can obviously improve Reservoir Seepage environment.Compared with traditional SAGD technologies, superheated steam injection assisted gravity drainage
Technology carries heat advantage high using superheated steam, being capable of more preferable heated oil reservoir.When steam injection amount is identical, superheated steam well
With shaft bottom mass dryness fraction higher, bigger heating radius, its effect of increasing production is also more obvious.Therefore, superheated steam assisted gravity
Oil drainage technology can more effectively improve the development effectiveness of super-heavy oil deposit and oil-sand reservoir.
If carrying out superheated steam assisted gravity drainage, it is ensured that steam quality loss ratio wet saturated steam when reaching shaft bottom
Small, so as to give full play to steam advantage in itself, on the other hand, superheated steam carries more heat contents than wet saturated steam, from
And the superheated steam amount that is needed in development process is smaller than wet saturated steam amount, and then gas oil ratio is improve, improve SAGD exploitations
Effect.
Table 1
SH-SAGD is carried out in this example to be contrasted with routine SAGD development effectiveness.SH-SAGD uses four kinds of superheated steam sides
Case (temperature is 350 DEG C, 400 DEG C, 450 DEG C or 500 DEG C superheated steams), the wet saturated steam temperature injected in conventional SAGD is
212℃.As can be seen from Table 1, compared with conventional SAGD, SH-SAGD can improve recovery ratio (2.8% or so), while accumulation
Gas oil ratio (cOSR) is increased substantially.By accompanying drawing 6 as can be seen that the cOSR of 400 DEG C of superheated steams reaches 0.37, far above current
The average level of the project that Canada is currently running.
Can be seen that superheated steam by Fig. 3 to Fig. 5 can substantially reduce steam injection amount, reduce conventional SAGD life cycles
Required quantity of steam.This is because superheated steam carries more heat contents than saturated vapor, so that the quantity of steam for needing subtracts
It is few, steam cost is greatly lowered.
In the identical SAGD production times, compared with wet saturated steam, the vapor chamber extension of superheated steam is some larger, and
High-temperature region scope is bigger.
The above, specific embodiment only of the invention, it is impossible to the scope that its restriction invention is implemented, so it is equivalent
The displacement of component, or the equivalent variations made according to scope of patent protection of the present invention and modification, should all still fall within what this patent was covered
Category.In addition, between technical characteristic and technical characteristic in the present invention, between technical characteristic and technical scheme, technical scheme with
Can be used with independent assortment between technical scheme.
Claims (10)
1. a kind of dual horizontal well superheated steam assisted gravity drainage well pattern, it is characterised in that the dual horizontal well superheated steam is aided in
Gravity drainage well pattern includes first level well (10) and the second horizontal well (20), and the horizontal segment of first level well (10) is located at second
The top of the horizontal segment of horizontal well (20), first level well (10) is steam injection well, and the second horizontal well (20) is producing well, the first water
Horizontal well (10) is contained within the first long string (11) and the first short string (12), and the first long string (11) is steam injection string, the first length
The steam injection position of tubing string (11) is corresponding with the tiptoe of the horizontal segment of first level well (10), the end of the first short string (12) with
The heel of the horizontal segment of first level well (10) is corresponding, and the segment fluid flow in first level well (10) can be by the first short tube
Post (12) is discharged, and the second horizontal well (20) is contained within the second long string (21) and the second short string (22), the second long string (21)
It is Multipurpose pipe column, the second long string (21) being capable of steam injection, steam injection position and second horizontal well (20) of the second long string (21)
Horizontal segment tiptoe it is corresponding, the end of the second short string (22) is relative with the heel of the horizontal segment of the second horizontal well (20)
Should, the segment fluid flow in the second horizontal well (20) can be discharged by the second short string (22).
2. dual horizontal well superheated steam assisted gravity drainage well pattern according to claim 1, it is characterised in that first level
The horizontal segment of well (10) and the horizontal segment of the second horizontal well (20) are parallel to each other, the horizontal segment and the second water of first level well (10)
The distance between horizontal segment of horizontal well (20) is 5m, and the horizontal segment of the second horizontal well (20) is apart from oil reservoir bottom 2m, first level
The horizontal segment of well (10) and the horizontal section length of the second horizontal well (20) are 850m.
3. dual horizontal well superheated steam assisted gravity drainage well pattern according to claim 1, it is characterised in that the first short tube
The end of post (12) is provided with extension tubing string (13), and the end of the second short string (22) is provided with screw pump (23).
4. a kind of dual horizontal well superheated steam assisted gravity drainage recovery method, it is characterised in that the dual horizontal well overheat is steamed
Vapour assisted gravity drainage recovery method is comprised the following steps：
Step 1, well net deployment；
Dual horizontal well superheated steam assisted gravity drainage well pattern described in deployment claim 1；
Step 2, circulation preheating；
Make steam respectively in first level well (10) and the second horizontal well (20) interior circulation, until first level well (10) and second
Horizontal well reaches thermal communication between (20)；
Step 3, production；
To injection superheated steam in first level well (10), recovered the oil by the second horizontal well (20).
5. dual horizontal well superheated steam assisted gravity drainage recovery method according to claim 4, it is characterised in that described
Dual horizontal well superheated steam assisted gravity drainage well net deployment in depth for 160m~180m oil reservoir in, the oil reservoir
Average effective caliper be 18m, the average oil saturation of the oil reservoir is 75%, and the effecive porosity of the oil reservoir is
32%, the permeability average out to 4000 × 10 of the oil reservoir-3μm2~5000 × 10-3μm2, the vertical infiltration of the oil reservoir
Rate is 0.6~1.0 with the ratio of horizontal permeability.
6. dual horizontal well superheated steam assisted gravity drainage recovery method according to claim 4, it is characterised in that in step
In rapid 2, the first long string (11) while to first level well (10) interior steam injection the second long string (21) to the second horizontal well
(20) interior steam injection.
7. dual horizontal well superheated steam assisted gravity drainage recovery method according to claim 4, it is characterised in that in step
In rapid 2, realized when the temperature at midpoint position between first level well (10) and the second horizontal well (20) reaches 75 DEG C~95 DEG C
The thermal communication.
8. dual horizontal well superheated steam assisted gravity drainage recovery method according to claim 4, it is characterised in that in step
In rapid 3, the temperature for injecting the superheated steam is 300 DEG C~550 DEG C.
9. dual horizontal well superheated steam assisted gravity drainage recovery method according to claim 8, it is characterised in that injection
The temperature of the superheated steam is 350 DEG C, 400 DEG C, 450 DEG C or 500 DEG C.
10. dual horizontal well superheated steam assisted gravity drainage recovery method according to claim 4, it is characterised in that
In step 3, maintain subcool at 5 DEG C~15 DEG C in process of production, produced when instantaneous steam oil ratio (SOR) reaches 6 and terminated.
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| CN201611095956.XA CN106761626A (en) | 2016-12-02 | 2016-12-02 | Dual horizontal well superheated steam assisted gravity drainage well pattern and recovery method |
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| CN201611095956.XA CN106761626A (en) | 2016-12-02 | 2016-12-02 | Dual horizontal well superheated steam assisted gravity drainage well pattern and recovery method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131124A (en) * | 2017-11-13 | 2018-06-08 | 中国石油天然气股份有限公司 | A kind of method using solvent and superheated steam assisted gravity drainage |
| CN111550222A (en) * | 2019-02-11 | 2020-08-18 | 中国石油天然气股份有限公司 | Method for exploiting natural gas hydrate by injecting steam |
| CN111894539A (en) * | 2019-05-05 | 2020-11-06 | 中国石油天然气股份有限公司 | Super heavy oil steam cavity development method |
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| WO2012170157A2 (en) * | 2011-06-07 | 2012-12-13 | Conocophillips Company | Hydrocarbon recovery through gas production control for noncondensable solvents or gases |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108131124A (en) * | 2017-11-13 | 2018-06-08 | 中国石油天然气股份有限公司 | A kind of method using solvent and superheated steam assisted gravity drainage |
| CN111550222A (en) * | 2019-02-11 | 2020-08-18 | 中国石油天然气股份有限公司 | Method for exploiting natural gas hydrate by injecting steam |
| CN111550222B (en) * | 2019-02-11 | 2022-07-05 | 中国石油天然气股份有限公司 | Method for exploiting natural gas hydrate by injecting steam |
| CN111894539A (en) * | 2019-05-05 | 2020-11-06 | 中国石油天然气股份有限公司 | Super heavy oil steam cavity development method |
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