CN108316905A - A method of inhibit SAGD vapor chambers longitudinally to advance by leaps and bounds - Google Patents
A method of inhibit SAGD vapor chambers longitudinally to advance by leaps and bounds Download PDFInfo
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- 238000010796 Steam-assisted gravity drainage Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 213
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 105
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 230000005764 inhibitory process Effects 0.000 claims abstract description 7
- 238000012546 transfer Methods 0.000 claims abstract description 5
- 230000009467 reduction Effects 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 54
- 238000002347 injection Methods 0.000 claims description 45
- 239000007924 injection Substances 0.000 claims description 45
- 238000012544 monitoring process Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 239000013589 supplement Substances 0.000 claims description 7
- 239000000295 fuel oil Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 3
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- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 7
- 229960005419 nitrogen Drugs 0.000 description 97
- 239000007789 gas Substances 0.000 description 23
- 239000011435 rock Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 10
- 239000010779 crude oil Substances 0.000 description 8
- 239000011229 interlayer Substances 0.000 description 7
- 238000010793 Steam injection (oil industry) Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
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- 230000005494 condensation Effects 0.000 description 2
- 235000013399 edible fruits Nutrition 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000003027 oil sand Substances 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 206010003694 Atrophy Diseases 0.000 description 1
- 235000011615 Pinus koraiensis Nutrition 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
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Abstract
The present invention provides a kind of methods that inhibition SAGD vapor chambers are longitudinally advanced by leaps and bounds.This approach includes the following steps：The vapor chamber that oil reservoir is exploited in certain SAGD longitudinally advances by leaps and bounds and injects normal-temperature water at well point, to reduce the temperature of the chamber of advancing by leaps and bounds at the top of vapor chamber, when temperature is down to 150 DEG C~180 DEG C, stops water filling；Be then injected into nitrogen, at the top of vapor chamber, the bottom of chamber portion that advances by leaps and bounds form heat insulating belt, control vapor chamber is advanced by leaps and bounds the heat transfer of chamber to top, and reduction is advanced by leaps and bounds cavity temperature, and the rate of climb of the well point vapor chamber is inhibited；It is repeatedly injected normal-temperature water and nitrogen several times, and then SAGD vapor chambers is inhibited longitudinally to advance by leaps and bounds.The present invention can either inhibit vapor chamber to advance by leaps and bounds and can ensure that vapor chamber stablizes extension, can be effectively improved SAGD production effects in such a way that water+nitrogen alternately injects.
Description
Technical field
The present invention relates to a kind of methods that inhibition SAGD vapor chambers are longitudinally advanced by leaps and bounds, and belong to technical field of petroleum extraction.
Background technology
Steam assisted gravity drainage (SAGD) is to be exploited using steam as heat source by the gravity of pitch and condensed liquid
Viscous crude.Viscosity of crude under the initial condition of stratum is high, without fluid ability, to be exploited, and first has to realize between injection-production well
Thermal communication (that is, reservoir temperature is made to reach crude oil flowable temperature)；After forming thermal communication, from steam injection well continuously to oil reservoir
High-quality steam is injected, it is made to form vapor chamber in the earth formation, by the way that vapor chamber is upward and side is moved, with the crude oil in oil reservoir
Heat exchange occurs, the crude oil and steam condensate (SC) of heating are by output in gravity aerial drainage to the producing well of lower part.
Professor Butler in 1997 proposes the development scheme of addition gas-powered during steam auxiliary oil drainage.Exist
Non-condensation gas is added in the injection steam of SAGD, under gravitational differentiation and devaporation, non-condensation gas is distributed in oil
Layer top, reduces heat transfer rate of the steam to overlying rock, to improve the thermal efficiency, mechanism is as shown in Figure 1.
SAGD is most successful in current heavy oil and oil-sand exploitation because of its high recovery rate, the technical characterstic of high rate of oil production
One of thermal recovery technology has been considered to the standard technique of heavy oil and oil-sand exploitation, is used widely at present.
For example, CN201843600U discloses a kind of SAGD mechanical lifts cycle pre-heating device, it is applied to the skill of horizontal well
In art casing.The equipment includes steam injection tubing string, mechanical lift tubing string, oil well pump, can be solved because deep-well or strata pressure are low
The problem of oil reservoir cycle preheats cannot be carried out in well depth liquid column hydrostatic pressure.CN205638411U discloses a kind of combination well pattern,
Including horizontal production well, more mouthfuls of High angle steam injection wells, special thick stratified deposit can be effectively employed.CN203626767U discloses one
The experimental provision and system of kind gas auxiliary SAGD exploitation super-viscous oils, including experimental provision, polynary injection device, data acquisition dress
It sets and process units further increases the super-viscous oil oil of gas oil ratio for the research raising SAGD thermals efficiency, increase steam swept volume
It hides effective exploitation technology and data support is provided.
Although those skilled in the art achieve some achievements in SAGD researchs, it is understood that ensure the exploitation effect of SAGD
Fruit is it is necessary to ensuring being effectively formed and extending for vapor chamber.And in existing SAGD recovery process, especially for top water
Super-heavy oil deposit, due to the influence of the factors such as Reservoir Heterogeneity, steam overlap, will appear on vapor chamber longitudinal direction part advance by leaps and bounds
Phenomenon, it is easy to make oil reservoir top pitch shell soften, bottom differential pressure action causes top to let out under water on top, seriously affects SAGD exploitation effects
Fruit.The problem of advancing by leaps and bounds for vapor chamber is generally advanced by leaps and bounds by the way of steam injection well closing well to slow down in the prior art, but is noted
The long-term closing well of vapour well can cause vapor chamber atrophy, temperature to reduce, and oil production is made to reduce, and SAGD development effectiveness is deteriorated.
Invention content
In order to solve the above technical problems, the purpose of the present invention is to provide a kind of sides that inhibition SAGD vapor chambers are longitudinally advanced by leaps and bounds
Method.This method can either inhibit vapor chamber to advance by leaps and bounds and can ensure that vapor chamber stablizes expansion in such a way that water+nitrogen alternately injects
Exhibition, can be effectively improved SAGD production effects.
For convenience of understanding, in the present invention, the vapor chamber after longitudinal direction is advanced by leaps and bounds will occur and be divided into two parts, bottom is referred to as original
Vapor chamber, top are known as chamber of advancing by leaps and bounds.
In order to achieve the above objectives, the present invention provides a kind of methods that inhibition SAGD vapor chambers are longitudinally advanced by leaps and bounds comprising with
Lower step：
(1) vapor chamber that oil reservoir is exploited in certain SAGD is longitudinally advanced by leaps and bounds (i.e. vapor chamber high point) injection normal-temperature water at well point, with
Reduce advancing by leaps and bounds at the top of original vapor chamber (steam chamber parts before advancing by leaps and bounds are known as original vapor chamber in the present invention)
The temperature of chamber stops water filling when the temperature for chamber of advancing by leaps and bounds is down to 150 DEG C~180 DEG C；
(2) it is then injected into nitrogen, at the top of original vapor chamber, bottom of chamber portion formation heat insulating belt of advancing by leaps and bounds, controls original vapor chamber
It advances by leaps and bounds to top the heat transfer of chamber, reduction is advanced by leaps and bounds cavity temperature, and the rate of climb of the well point vapor chamber is inhibited；
(3) if the temperature for chamber of advancing by leaps and bounds reaches 180 DEG C or more again, repeatedly step (1) and (2) (can be with repeated several times
Step (1) and (2), depending on the temperature for chamber of advancing by leaps and bounds), while monitoring the height of vapor chamber, when the well point vapor chamber height with
When the gap ＜ 5m of offset well vapor chamber height, then stop step (1) and (2), completes the inhibition longitudinally advanced by leaps and bounds to SAGD vapor chambers.
Specific implementation mode according to the present invention, it is preferable that the above method further includes step (1) -1 before step (1)：
Determine that the oil reservoir of SAGD exploitations is longitudinally advanced by leaps and bounds situation with the presence or absence of vapor chamber.It is highly preferred that determine SAGD exploitation oil reservoir whether
There are longitudinally the advance by leaps and bounds modes of situation of vapor chamber to be：The well monitoring materials of the oil reservoir are collected (more specifically, can be that well temperature monitors
Data), when the vapor chamber height of certain straight well is higher than offset well vapor chamber height 20m~25m, then it is assumed that the well control range memory
It longitudinally advances by leaps and bounds situation in vapor chamber.The present invention determines the expanded height of vapour chamber according to well Surveillance on Haemorrhagic, and then predicts vapour chamber
Development condition.When monitoring that certain straight well vapour chamber height is higher than offset well vapor chamber height 20m~25m, it is believed that the well controls model
Enclose it is interior advance by leaps and bounds phenomenon there are vapour chamber, need to be regulated and controled, reduce the vapour chamber rate of climb.
The present invention can either inhibit vapor chamber to advance by leaps and bounds and can ensure that vapor chamber is steady in such a way that water+nitrogen alternately injects
Fixed extension.Nitrogen thermal coefficient is small (such as Fig. 2 --- shown in thermal coefficient curve of the nitrogen under different temperatures and pressure), belong to every
Hot material can play good heat-blocking action, while the density of nitrogen is less than density (such as Fig. 3 --- the different condition of steam
Lower density of nitrogen from shown in different mass dryness fraction vapour density comparison diagrams), original vapor chamber top can be distributed in；Relative to steam, often
The heat content of warm water is much smaller than the heat content of water vapour, has better cooling effect.About the gas distribution in vapor chamber, due to weight
The different and devaporation of power point, nitrogen are mainly distributed at the top of original vapor chamber.On the one hand, as shown in figure 3, working as steam quality
For 60%-70% when, the density of nitrogen is less than the density of steam, when being compared with dry saturated steam, only when temperature higher than 320 DEG C or
When pressure is higher than 12MPa, the density of nitrogen is just less than the density of water vapour；In SAGD, shaft bottom mass dryness fraction ＞ 70%, vapor chamber
Operating pressure is generally 2-4MPa, is centainly less than the density of steam to the density of nitrogen.On the other hand, the injection drop of normal-temperature water
Low chamber temperature of advancing by leaps and bounds, makes water vapour condensation Cheng Shui to the cold so that nitrogen is mainly distributed at the top of original vapor chamber；Using oil reservoir
Numerical simulation software simulates distributional pattern of the nitrogen in vapor chamber, such as Fig. 4 --- shown in the figure of nitrogen molar distribution field, steam
Mole depth highest of top of chamber nitrogen, for the main distributed areas of injection nitrogen.
In the above-mentioned methods, it is preferable that the injection rate of the normal-temperature water in step (1) is 550t~700t, and injection rate is
30t/d~40t/d.
In the above-mentioned methods, it is preferable that the nitrogen in step (2) is divided into two parts injection, respectively initial nitrogen injection
With supplement nitrogen injection；Initial nitrogen injection rate is 45 × 104Nm3~55 × 104Nm3, initial nitrogen injection rate be 2.5 ×
104Nm3/ d~3.0 × 104Nm3/d；After completing initial injection rate, continue with 1.0 × 104Nm3/ d~1.5 × 104Nm3/ d's
Injection rate injection supplement nitrogen, to maintain the thickness of blanket of nitrogen.Since vapor chamber is ever-expanding, to maintain nitrogen thickness
Degree, reaches expected effect, therefore need to suitably supplement nitrogen, supplements the injection rate of nitrogen depending on field conduct situation, only
It is able to maintain that nitrogen layer thickness, if finding that chamber temperature of advancing by leaps and bounds reaches 180 DEG C or more during injection supplement nitrogen,
Then stop injecting nitrogen, starts to be repeatedly injected normal-temperature water.
Water injection rate, note nitrogen quantity are excessive, can influence oil well output to a certain extent, and too small water injection rate, note nitrogen quantity reach
Less than the effect that suppression vapour making cavity is advanced by leaps and bounds, water filling, note nitrogen quantity and injection rate are suitable for chamber height of advancing by leaps and bounds defined by the present invention
In 20-35m or so, chamber ranging from well spacing (65-75m) left and right of advancing by leaps and bounds, vapor chamber temperature is 200 DEG C~240 DEG C when advancing by leaps and bounds
Condition, can effectively inhibit vapor chamber to advance by leaps and bounds, promote SAGD vapor chamber equilibriums extension, improve oil recovery.
In the above-mentioned methods, it is highly preferred that the injection rate of the normal-temperature water in step (1) is determined by following formula：
Q=△ H ÷ (Hw1-Hw2)(1)；
Wherein, Q is the injection rate of normal-temperature water, kg；Hw1For the enthalpy of 150 DEG C of hot water, kJ/kg；Hw2For the enthalpy of 20 DEG C of hot water,
KJ/kg,
△ H are that intracavitary saturated vapor of advancing by leaps and bounds drops to enthalpy needed for 150 DEG C of hot water, kJ：△ H=H0-Hw(2)；
H0For the enthalpy for intracavitary steam of advancing by leaps and bounds, kJ：H0=Vh "/v " (3)；
HwFor the enthalpy of 150 DEG C of steam with intracavitary steam homogenous quantities of advancing by leaps and bounds, kJ：Hw=Vhw”/v”(4)；
V be advance by leaps and bounds chamber can displacement volume, m3：
Wherein,For oil reservoir porosity, %；h1Vapor chamber (chamber of advancing by leaps and bounds) high point is to normal steam chamber top surface when to advance by leaps and bounds
Highly, m；R is the lateral extent (general well spacing (65-75m) left and right) of chamber of advancing by leaps and bounds, m；At a temperature of h " is vapor chamber when advancing by leaps and bounds
The enthalpy (general temperature range is 200 DEG C~240 DEG C) of steam, kJ/kg；V " is the specific volume of steam at a temperature of vapor chamber when advancing by leaps and bounds,
m3/kg；hw" be 150 DEG C of steam enthalpy, kJ/kg.
Above-mentioned formula is determined by following procedure：If the vapor chamber high point that SAGD longitudinally advances by leaps and bounds is to normal steam chamber top surface
Height is h1, some vapor cavity volume of advancing by leaps and bounds is approximately cone, and saturated vapor is full of in cavity of advancing by leaps and bounds, and injects normal-temperature water processus aboralis
All become 150 DEG C of hot water into the saturated vapor in cavity, and injects water and increase heat=saturated vapor loss heat.
In the above-mentioned methods, it is highly preferred that the nitrogen injection rate and injection rate in step (1) are through the following steps that really
Fixed, as shown in Figure 5：
1. determining nitrogen layer thickness
According to law of conservation of energy：Heat=interlayer that original vapor chamber flows into interlayer through blanket of nitrogen flows into the heat for pushing up water
Amount：
Q=λgA(TS-TB)/hg=λBA(TB-Tw)/hB,
Then hg=λg(TS-TB)hB/λB(TB-Tw) (6)
Wherein, Q is the heat that original vapor chamber flows into blanket of nitrogen, W；λgFor the rock of saturation nitrogen and gas drive residual oil
Thermal coefficient, W/ (mK)；TBFor interlayer bottom temp, K；TSFor vapor chamber temperature, K；λBFor interlayer rock thermal coefficient, W/
(m·K)；TwTo push up water layer bottom temp, original reservoir temperature, K can use；hgIt is thick for the rock of saturation nitrogen and gas drive residual oil
It spends (i.e. nitrogen layer thickness), m；hBFor interlayer rock thickness, m；
2. determining nitrogen injecting quantity
Nitrogen injecting quantity is the nitrogen volume under the standard conditions reached needed for nitrogen layer thickness；
By material balance method, nitrogen amount+note nitrogen of free nitrogen amount+crude oil dissolving consumption in nitrogen injecting quantity=blanket of nitrogen
The nitrogen amount dissolved in gas stage output oil；
1. the amount of the nitrogen substance dissolved in nitrogen injection stage output oil：
ngo=2 (PSC/ZSCRTSC)×Vod×(Rgo-Rgi) (7)
Wherein, PSCFor the pressure under the status of criterion, Pa；ZSCFor the compressibility factor of nitrogen under the status of criterion, 1 is taken；TSCFor mark
Temperature under quasi- situation, K；R is gas constant, takes 8.314J/ (Kmol)；VodFor ground cumulative oil production, m3；RgoFor stratum
Under the conditions of dissolved gas oil ratio, m3/m3；RgiFor primary Korean pine forest, m3/m3。
2. the nitrogen amount of crude oil dissolving consumption includes two parts：
The amount of nitrogen substance in blanket of nitrogen in gas drive residual oil：
The amount of nitrogen substance in nitrogen vapor intracavitary remaining oil：
Wherein, VgRFor the rock volume occupied by the free nitrogen in stratum, VgR=hg×Sr, m3, hgFor saturation nitrogen and
The rock thickness of gas drive residual oil, m；SrIt, can be according to numerical reservoir for the floor space of the rock stratum of saturation nitrogen and gas drive residual oil
The temperature field of the equivalent layer of simulation tracing and saturation field determine its approximate form (round, rectangular, oval, icepro shape etc.), in turn
Calculate SrValue, m2；SorgFor residual oil saturation under the conditions of oil gas (referring to nitrogen), %；VsRShared by the nitrogen vapor chamber in stratum
According to rock volume, m3；For reservoir pore degree, decimal；SorwFor residual oil saturation under the conditions of grease, %；
3. the amount of the substance of free nitrogen in blanket of nitrogen：
Wherein, PSFor vapo(u)rous pressure, Pa；T is the absolute temperature of blanket of nitrogen, K；Z is nitrogen compressibility factor；R is gas
Body constant takes 8.314J/ (Kmol)；For reservoir pore degree, decimal；VgRFor the rock occupied by the free nitrogen in stratum
Volume, computational methods are same as above, m3；SorgFor residual oil saturation under the conditions of oil gas (referring to nitrogen), %；SwcTo fetter water saturation
Degree, %；
Wherein, Z is determined by following steps：
Indicate that the difference of actual gas and perfect gas p υ T features, state equation are write with compressibility factor Z in engineering
For：
P υ=ZRT (11)
Again
(12) formula is substituted into (11) formula, abbreviation obtains：
P-R equations are the real gas equations of two parameter, and citation form is：
Wherein,
In formula, P is the pressure (in the pressure that the present invention is blanket of nitrogen) of system, kPa；T is the temperature of system (in the present invention
For the pressure of blanket of nitrogen), K；PcFor nitrogen critical pressure, 3349kPa；TcFor the critical-temperature of nitrogen, 126.15K；TrFor gas
Reduced temperature,ω is eccentric factor, ω=1 under the conditions of pure nitrogen gas；υ is nitrogen specific volume, m3/kmol；R is that gas is normal
Number, takes 8.314J/ (Kmol)；
For given warm-pressing system, υ can be acquired by formula (14), (15), (16), then the υ values acquired are substituted into (12) formula
In acquire ρ values, finally substitute into (13) formula in acquire Z values；
4. needing injection nitrogen volume under mark condition：V=2ZSC(ngo+ngs+ngR)RTSC/PSC(17)；
Wherein, ngs=ngs1+ngs2；
3. determining nitrogen injection rate
In the actual production process, nitrogen vapor chamber constantly expands, and draining face is also constantly moved to its outer layer, the unit interval
Interior required note nitrogen speed can be calculated by following formula：
Q=2 [(ZSCTSCPS/ZTSPSC)×qgf+qgor+qgo] (18)
Wherein：
Wherein, qgfFor the dilatation in blanket of nitrogen in the unit time, m3/s；qgorTo be dissolved in nitrogen in the unit time
Nitrogen volume in layer in residual oil, m3/s；qgoFor the nitrogen volume dissolved in output oil in the unit time, m3/s；L is level
Well horizontal section length, m；KoFor the permeability of crude oil, μm2；A is the temperature diffusivity of crude oil, m2/s；G is acceleration of gravity, 9.8m/
s2；For reservoir pore degree, decimal；M is that viscous crude glues wyntet's sign index, zero dimension；△SoFor the variable quantity of oil saturation, △ So
=Soi-Sorw, %；SoiFor initial oil saturation, %；SorwFor residual oil saturation under the conditions of grease, %；vosFor steam temperature
The kinematic viscosity of the lower crude oil of degree, m2/s；H is core intersection, m；hgTo be saturated the rock thickness of nitrogen and gas drive residual oil, m；y0
To produce well spacing oil reservoir distance from bottom, m；There is explanation in other parameters, details are not described herein again in above formula.
In formula (1)~(21) of the present invention, in order to seek the parameters used in result, it can pass through ability
The conventional technical means in domain obtains, and those skilled in the art know how to obtain these parameters, for the acquisition modes of each parameter
Herein without repeating.
In the above-mentioned methods, it is preferable that in step (3), the gap of the height and offset well vapor chamber height of vapor chamber is
Judged by well temperature monitoring materials.
In the above-mentioned methods, it is preferable that the oil reservoir is heavy crude reservoir；It is highly preferred that the oil reservoir is super-heavy oil deposit.
The present invention provides a kind of method for longitudinally advancing by leaps and bounds of inhibition SAGD vapor chambers, it is included in vapor chamber and advances by leaps and bounds and hand at well point
For injection normal-temperature water and nitrogen, reduce vapour top of chamber and advance by leaps and bounds portion temperature, and at the top of vapor chamber, the bottom of chamber portion that advances by leaps and bounds formed it is heat-insulated
Band, control vapor chamber are advanced by leaps and bounds the heat transfer of chamber to top, and reduction is advanced by leaps and bounds cavity temperature, is pressed down the rate of climb of vapour making cavity, is promoted
The balanced extension of vapor chamber, improves SAGD recovery ratios.
Description of the drawings
Fig. 1 is the mechanism figure that gas assists SAGD technologies.
Fig. 2 is thermal coefficient curve of the nitrogen under different temperatures and pressure.
Fig. 3 is density of nitrogen and different mass dryness fraction vapour density comparison diagrams under different condition.
Fig. 4 is the nitrogen molar distribution field figure in vapor chamber.
Fig. 5 is top water, interlayer, blanket of nitrogen, advance by leaps and bounds chamber and the schematic diagram of vapor chamber.
Fig. 6 is the SAGD hole pattern schematic diagrames of embodiment 1.
Fig. 7 is the SAGD vapor chambers section temperature field figure in normal steam injection of embodiment 1.
Fig. 8 is the SAGD vapor chamber sections temperature field figure after normal-temperature water+nitrogen alternately injects of embodiment 1.
Specific implementation mode
In order to which technical characteristic, purpose and the advantageous effect to the present invention are more clearly understood, now to the skill of the present invention
Art scheme carry out it is described further below, but should not be understood as to the present invention can practical range restriction.
Embodiment 1
Certain oil reservoir is top bottom water super-heavy oil deposit, does not have pure shale interlayer, but grease between oil reservoir and surrounding water
Interface " pitch shell " 0.5~2m of thickness, oil reservoir average thickness 77.0m, maximum 126.6m.Using straight well+water as shown in FIG. 6
The AGD exploitations of horizontal well combination S.One big vapour chamber is integrally formed in trial zone.Monitoring materials show that nearby vapour chamber height 90m is left for G4 wells
The right side, and the other well spacing oil overhold 50m~70m of surrounding, showing G4 wells, nearby vapour chamber is advanced by leaps and bounds in the longitudinal direction.
The chamber height 30m or so that advances by leaps and bounds, planar range 70m or so, vapour chamber are thought in well monitoring materials and reservoir numerical simulation
High point temperature is up to 244 DEG C.
Normal-temperature water is injected first at the well points G4, by formula (1)~(5), determination need to inject normal-temperature water 650t, flat to ensure
Steady production, waterflood injection rate should not be too large, should be in 30t/d~40t/d；It is true according to well temperature monitoring materials, reservoir numerical simulation simultaneously
Surely cavity inner temperature of advancing by leaps and bounds reaches 150 DEG C~180 DEG C or so of desired temperature (if can suitably increase water filling higher than ideal temperature
Between), start to inject nitrogen.
By formula (6) calculate needed for minimum blanket of nitrogen thickness 12m or so；Nitrogen is calculated to obtain by formula (7)~(21)
Injection rate is 50 × 104Nm3Left and right, injection rate are 2.5 × 104Nm3/ d~3.0 × 104Nm3/d；Simultaneously as vapor chamber is not
It is disconnected to expand, to maintain the thickness of nitrogen-gas heat-insulating layer within a certain period of time, it need to continue to inject nitrogen, it is 1.3 to optimize its injection rate
×104Nm3/ d or so.If considering the loss amount of nitrogen, it can suitably increase nitrogen vapour injection rate in actual production, generally can be improved
10%~15%.
After implementing a normal-temperature water+nitrogen slug injection, vapour chamber high point temperature is down to 175 DEG C by 244 DEG C (as shown in Figure 7)
(as shown in Figure 8) effectively reduces vapour top of chamber temperature, reduces SAGD vapor chambers and longitudinally advances by leaps and bounds speed.
Claims (9)
1. a kind of method for inhibiting SAGD vapor chambers longitudinally to advance by leaps and bounds comprising following steps：
(1) vapor chamber that oil reservoir is exploited in certain SAGD longitudinally advances by leaps and bounds and injects normal-temperature water at well point, to reduce at the top of original vapor chamber
Chamber of advancing by leaps and bounds temperature, when the temperature for chamber of advancing by leaps and bounds is down to 150 DEG C~180 DEG C, stop water filling；
(2) it is then injected into nitrogen, at the top of original vapor chamber, bottom of chamber portion formation heat insulating belt of advancing by leaps and bounds, controls original vapor chamber to top
Portion advances by leaps and bounds the heat transfer of chamber, and reduction is advanced by leaps and bounds cavity temperature, and the rate of climb of the well point vapor chamber is inhibited；
(3) if the temperature for chamber of advancing by leaps and bounds reaches 180 DEG C or more again, repeatedly step (1) and (2) while the height for monitoring vapor chamber
Degree then stops step (1) and (2), completion pair as the gap ＜ 5m of the height of the well point vapor chamber and offset well vapor chamber height
The inhibition that SAGD vapor chambers are longitudinally advanced by leaps and bounds.
2. according to the method described in claim 1, it further includes step (1) -1 before step (1)：Determine the oil of SAGD exploitations
It hides and longitudinally advances by leaps and bounds situation with the presence or absence of vapor chamber.
3. according to the method described in claim 2, wherein it is determined that the oil reservoir of SAGD exploitations is longitudinally advanced by leaps and bounds feelings with the presence or absence of vapor chamber
The mode of condition is：The well monitoring materials for collecting the oil reservoir, when certain straight well vapor chamber height higher than offset well vapor chamber height 20m~
When 25m, then it is assumed that longitudinally advance by leaps and bounds situation there are vapor chamber in the well control range.
4. according to the method described in claim 1, wherein, the injection rate of the normal-temperature water in step (1) is 550t~700t.
5. according to the method described in claim 1, wherein, the injection rate of the normal-temperature water in step (1) is 30t/d~40t/d.
6. method according to claim 1 or 4, wherein the injection rate of the normal-temperature water in step (1) is to pass through following formula
Determining：
Q=△ H ÷ (Hw1-Hw2) (1)；
Wherein, Q is the injection rate of normal-temperature water, kg；Hw1For the enthalpy of 150 DEG C of hot water, kJ/kg；Hw2For the enthalpy of 20 DEG C of hot water, kJ/kg,
△ H are that intracavitary saturated vapor of advancing by leaps and bounds drops to enthalpy needed for 150 DEG C of hot water, kJ：△ H=H0-Hw(2)；
H0For the enthalpy for intracavitary steam of advancing by leaps and bounds, kJ：H0=Vh "/v " (3)；
HwFor the enthalpy of 150 DEG C of steam with intracavitary steam homogenous quantities of advancing by leaps and bounds, kJ：Hw=Vhw”/v” (4)；
V be advance by leaps and bounds chamber can displacement volume, m3：
Wherein,For oil reservoir porosity, %；h1Vapor chamber high point is to normal steam chamber apical side height, m when to advance by leaps and bounds；R is to advance by leaps and bounds
The lateral extent of chamber, m；H " is the enthalpy of steam at a temperature of vapor chamber when advancing by leaps and bounds, kJ/kg；V " is to be steamed at a temperature of vapor chamber when advancing by leaps and bounds
The specific volume of vapour, m3/kg；hw" be 150 DEG C of steam enthalpy, kJ/kg.
7. according to the method described in claim 1, wherein, the nitrogen in step (2) is divided into two parts injection, respectively initial nitrogen
Gas injects and supplement nitrogen injection；Initial nitrogen injection rate is 45 × 104Nm3~55 × 104Nm3, initial nitrogen injection rate is
2.5×104Nm3/ d~3.0 × 104Nm3/d；After completing initial injection rate, continue with 1.0 × 104Nm3/ d~1.5 ×
104Nm3The injection rate injection supplement nitrogen of/d, to maintain the thickness of blanket of nitrogen.
8. according to the method described in claim 1, wherein, the oil reservoir is heavy crude reservoir.
9. according to the method described in claim 8, wherein, the oil reservoir is super-heavy oil deposit.
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