CN104484550B - Method and device for acquiring reservoir capacity of gas storage reservoir reconstructed from flooded gas reservoir - Google Patents
Method and device for acquiring reservoir capacity of gas storage reservoir reconstructed from flooded gas reservoir Download PDFInfo
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- 238000003860 storage Methods 0.000 title claims abstract description 343
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 28
- 239000003345 natural gas Substances 0.000 claims description 14
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Abstract
The invention provides a method and a device for acquiring the storage capacity of a gas storage reservoir reconstructed from a water flooded gas reservoir, wherein the method comprises the following steps: acquiring the change relation of a gas-water interface of the gas storage along with the change of the reservoir pressure; dividing the pore volume occupied by the gas reservoir dynamic reserve of the gas reservoir into three gas reservoir fluid regions of a gas region, a gas-water interaction region and a water region according to the change relationship, and calculating the pore volume of each gas reservoir fluid region contributing to the gas reservoir dynamic reserve; correspondingly deducting the pore volume which cannot be used for gas storage in each gas storage fluid region according to the pore volume which is contributed to the gas storage dynamic reserve by each gas storage fluid region; the reservoir capacity of the reservoir is calculated by deducting the pore volume in each reservoir fluid region that cannot be used for gas storage. The calculation result of the method is high in accuracy, and the calculation precision of the method is further improved along with the enhancement of the water body capacity of the gas reservoir, so that accurate reservoir capacity technical parameters can be provided for early evaluation of the gas reservoir.
Description
Technical field
The present invention relates to natural gas storage and technical field, is reconstructed by watered-out gas reservoir more particularly, to a kind of acquisition
The method and apparatus of the storage capacity of gas storage.
Background technology
Gas storage is the powerful measure for adjusting gas distributing system balance between supply and demand, weighs the important indicator of gas storage regulating power
It is storage capacity, the accurate storage capacity that calculates is the technical barrier for perplexing related scientific research personnel.
Currently, the storage capacity after watered-out gas reservoir gas storage reconstruction generally takes dynamic holdup numerical value, (such as document in December, 2012
The 12nd phase of volume 31《Oil ＆ Gas Storage》Article " determination of hypotonic lithologic gas reservoirs reconstruction underground natural gas storage tank Working gas capacity " and 2013
The 3rd phase of volume 20 May year《Fault-blcok oil-gas field》Article " do not close phase hide build Kuku be installed with meter " introduction computational methods).It should
Class computational methods think, the storage of gas storage gas will be entirely used for after the pore volume gas storage reconstruction occupied by dynamic holdup.
But in the engineering of existing watered-out gas reservoir gas storage reconstruction, influence of the water enchroachment (invasion) to reservoir is not accounted for, it mistakenly will be a part of
The pore volume that dynamic holdup occupies is calculated as building the gas storage pore volume behind library for gas storage, causes to design storage capacity
It is bigger than normal, and this deviation will expand with the increase of water influx.
Invention content
The purpose of the present invention is to provide a kind of method of the storage capacity for the gas storage for obtaining and reconstruct by watered-out gas reservoir with
Device, to obtain more accurately by the storage capacity of the gas storage of watered-out gas reservoir reconstruction.
In order to achieve the above objectives, on the one hand, the present invention provides a kind of gas storages for obtaining and being reconstructed by watered-out gas reservoir
The method of storage capacity, includes the following steps：
Obtain the variation relation that the gas-water interface of gas storage changes with reservoir pressure；
The pore volume that the gas reservoir protection reserves of the gas storage occupy is divided into gas area, gas according to the variation relation
Water interactive areas and three, pool gas storage fluid mass, and each gas storage fluid mass is calculated to the gas reservoir protection reserves tribute
The pore volume offered；
The pore volume that the gas reservoir protection reserves are contributed is corresponded to according to each gas storage fluid mass and deducts each storage
It cannot be used for the pore volume of gas storage in air reservoir fluid mass；
On the basis of deducting the pore volume that cannot be used for gas storage in each gas storage fluid mass, institute is calculated
State the storage capacity of gas storage.
The method of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, the gas for obtaining gas storage
The variation relation that water termination changes with reservoir pressure, including：
The relationship of the net water influx and reservoir pressure of gas-water interface is obtained according to formula W=f (P)；
According to formula V=G × BgObtain the corresponding pore volume V of dynamic holdup of gas storage；
Wherein, W is the corresponding net water influxs of pressure P, and f (P) is net water influx and the functional relation that reservoir pressure meets, G
For gas reservoir protection reserves, BgFor volume factor of the natural gas in reset pressure.
The method of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, it is described to be closed according to the variation
The pore volume that the gas reservoir protection reserves of the gas storage occupy is divided into gas area, air water interactive areas and the gas storage of three, pool by system
Library fluid mass, and the pore volume that the gas reservoir protection reserves are contributed in each gas storage fluid mass is calculated, including：
Utilize the corresponding net water influx W of gas storage threshold pressionminIt is corresponding with initial reservoir pressure when gas storage reconstruction
Net water influx Wab, calculate the gas net water influx W in area1=Wab-Wmin；
According to the net water influx W in the gas area1Calculate the pore volume V that the gas area contributes the gas reservoir protection reserves1=
W1/(1-Swc1-Sgr1)；
Utilize the corresponding net water influx W of gas storage threshold pressionminNet water influx W corresponding with gas storage pressure upper limitmax,
Calculate the air water net water influx W in interactive areas2=Wmax-Wmin；
According to the net water influx W in the air water interactive areas2The air water interactive areas is calculated to contribute the gas reservoir protection reserves
Pore volume V2=W2/(1-Swc2-Sgr2)；
The net water influx W in pool3Net water influx W corresponding equal to gas storage pressure upper limitmax；
According to the net water influx W in pool3Calculate the pore volume V that the gas reservoir protection reserves are contributed in the pool3=W3/
(1-Swc3-Sgr3)；
Wherein, Swc1、Swc2And Swc3The respectively constraint art saturation degree in gas area, air water interactive areas and pool, Sgr1、Sgr2With
Sgr3The residual gas saturation degree that respectively gas area, air water interactive areas and pool are generated by water enchroachment (invasion).
The method of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, it is described according to each gas storage
Fluid mass corresponds to deduct in each gas storage fluid mass and cannot be used for the pore volume that the gas reservoir protection reserves are contributed
The pore volume of gas storage, including：
According to formula Δ V1=(Swc1n-Swc1+Sgr1n)V1Obtain the pore volume Δ that cannot be used for gas storage in gas area
V1；
According to formula Δ V2=(Swc2n-Swc2+Sgr2n)V2Obtain the hole that cannot be used for gas storage in air water interactive areas
Volume delta V2；
According to formula Δ V3=(1-Swc3)V3Obtain the pore volume Δ V that cannot be used for gas storage in pool3；
Wherein, Swc1n、Swc2nAnd Swc3nThe respectively constraint in gas storage stable operation Shi Qi area, air water interactive areas and pool
Art saturation degree.
The method of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, the Swc1、Swc2And Swc3,
Sgr1、Sgr2And Sgr3And Swc1n、Swc2nAnd Swc3nIt obtains in the following manner：
Corresponding gas storage Seepage Experiment is separately designed according to the feature of each gas storage fluid mass, and passes through the storage
Air reservoir Seepage Experiment measures the constraint art saturation degree S of each gas storage fluid masswc1、Swc2And Swc3, residual gas saturation degree
Sgr1、Sgr2And Sgr3And constraint art saturation degree S when gas storage stable operationwc1n、Swc2nAnd Swc3n。
The method of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, it is described described each in deduction
On the basis of the pore volume that cannot be used for gas storage in gas storage fluid mass, the storage capacity of the gas storage is calculated, including：
According to formula VV=V- Δs V1-ΔV2-ΔV3Obtain the pore volume V that gas storage is used for gas storageV；
According to formula Gg=VV/BgThe storage capacity G of acquisitiong；
Wherein, BgFor volume factor of the natural gas in reset pressure.
On the other hand, the present invention also provides a kind of dresses of the storage capacity for the gas storage for obtaining and being reconstructed by watered-out gas reservoir
It sets, including：
Variation relation acquisition module, the variation relation that the gas-water interface for obtaining gas storage changes with reservoir pressure；
Pore volume division module, for occupied the gas reservoir protection reserves of the gas storage according to the variation relation
Pore volume is divided into gas area, air water interactive areas and three, pool gas storage fluid mass, and calculates each gas storage fluid zone
The pore volume that the gas reservoir protection reserves are contributed in domain；
Volume deducts module, the pore-body for being contributed the gas reservoir protection reserves according to each gas storage fluid mass
Product is corresponding to deduct the pore volume that cannot be used for gas storage in each gas storage fluid mass；
Storage capacity computing module, for deducting the hole that cannot be used for gas storage in each gas storage fluid mass
On gap volume basis, the storage capacity of the gas storage is calculated.
The device of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, the gas for obtaining gas storage
The variation relation that water termination changes with reservoir pressure, including：
The relationship of the net water influx and reservoir pressure of gas-water interface is obtained according to formula W=f (P)；
According to formula V=G × BgObtain the corresponding pore volume V of dynamic holdup of gas storage；
Wherein, W is the corresponding net water influxs of pressure P, and f (P) is net water influx and the functional relation that reservoir pressure meets, G
For gas reservoir protection reserves, BgFor volume factor of the natural gas in reset pressure.
The device of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, it is described to be closed according to the variation
The pore volume that the gas reservoir protection reserves of the gas storage occupy is divided into gas area, air water interactive areas and the gas storage of three, pool by system
Library fluid mass, and the pore volume that the gas reservoir protection reserves are contributed in each gas storage fluid mass is calculated, including：
Utilize the corresponding net water influx W of gas storage threshold pressionminIt is corresponding with initial reservoir pressure when gas storage reconstruction
Net water influx Wab, calculate the gas net water influx W in area1=Wab-Wmin；
According to the net water influx W in the gas area1Calculate the pore volume V that the gas area contributes the gas reservoir protection reserves1=
W1/(1-Swc1-Sgr1)；
Utilize the corresponding net water influx W of gas storage threshold pressionminNet water influx W corresponding with gas storage pressure upper limitmax,
Calculate the air water net water influx W in interactive areas2=Wmax-Wmin；
According to the net water influx W in the air water interactive areas2The air water interactive areas is calculated to contribute the gas reservoir protection reserves
Pore volume V2=W2/(1-Swc2-Sgr2)；
The net water influx W in pool3Net water influx W corresponding equal to gas storage pressure upper limitmax；
According to the net water influx W in pool3Calculate the pore volume V that the gas reservoir protection reserves are contributed in the pool3=W3/
(1-Swc3-Sgr3)；
Wherein, Swc1、Swc2And Swc3The respectively constraint art saturation degree in gas area, air water interactive areas and pool, Sgr1、Sgr2With
Sgr3The residual gas saturation degree that respectively gas area, air water interactive areas and pool are generated by water enchroachment (invasion).
The device of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, it is described according to each gas storage
Fluid mass corresponds to deduct in each gas storage fluid mass and cannot be used for the pore volume that the gas reservoir protection reserves are contributed
The pore volume of gas storage, including：
According to formula Δ V1=(Swc1n-Swc1+Sgr1n)V1Obtain the pore volume Δ that cannot be used for gas storage in gas area
V1；
According to formula Δ V2=(Swc2n-Swc2+Sgr2n)V2Obtain the hole that cannot be used for gas storage in air water interactive areas
Volume delta V2；
According to formula Δ V3=(1-Swc3)V3Obtain the pore volume Δ V that cannot be used for gas storage in pool3；
Wherein, Swc1n、Swc2nAnd Swc3nThe respectively constraint in gas storage stable operation Shi Qi area, air water interactive areas and pool
Art saturation degree.
The device of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, the Swc1、Swc2And Swc3,
Sgr1、Sgr2And Sgr3And Swc1n、Swc2nAnd Swc3nIt obtains in the following manner：
Corresponding gas storage Seepage Experiment is separately designed according to the feature of each gas storage fluid mass, and passes through the storage
Air reservoir Seepage Experiment measures the constraint art saturation degree S of each gas storage fluid masswc1、Swc2And Swc3, residual gas saturation degree
Sgr1、Sgr2And Sgr3And constraint art saturation degree S when gas storage stable operationwc1n、Swc2nAnd Swc3n。
The device of the storage capacity for the gas storage that the acquisition of the present invention is reconstructed by watered-out gas reservoir, it is described described each in deduction
On the basis of the pore volume that cannot be used for gas storage in gas storage fluid mass, the storage capacity of the gas storage is calculated, including：
According to formula VV=V- Δs V1-ΔV2-ΔV3Obtain the pore volume V that gas storage is used for gas storageV；
According to formula Gg=VV/BgThe storage capacity G of acquisitiong；
Wherein, BgFor volume factor of the natural gas in reset pressure.
The embodiment of the present invention directly takes the numerical value of dynamic holdup not as the prior art when calculating storage capacity, and
It is that the pore volume that dynamic holdup occupies is divided into these three gas storage fluid masses of gas area, air water interactive areas and pool, respectively
The pore volume that gas storage gas stores is cannot be used for after deducting the dynamic holdup gas storage reconstruction of each gas storage fluid mass,
Therefore, the result of calculation accuracy of the embodiment of the present invention increases substantially, and with the enhancing of Gas Reservoir Water ability of immigrants, the present invention
The computational accuracy of embodiment can further increase, and technical advantage highlights, so as to provide accurate library for gas storage evaluation early period
Capacity technologies parameter.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, not
Constitute limitation of the invention.In the accompanying drawings：
Fig. 1 is the method flow diagram of the storage capacity for the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir；
Fig. 2 be the storage capacity for the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir method in gas storage
Pore volume divides schematic diagram；
Fig. 3 is the structure diagram of the storage capacity for the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiment and attached drawing, to this
Invention is described in further details.Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not make
For limitation of the invention.
Below in conjunction with the accompanying drawings, the specific implementation mode of the present invention is described in further detail.
Refering to what is shown in Fig. 1, the method for the storage capacity for the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir
Include the following steps：
Step S101, the variation relation that the gas-water interface of gas storage changes with reservoir pressure is obtained.Specifically, according to formula
W=f (P) obtains the relationship of the net water influx and reservoir pressure of gas-water interface；According to formula V=G × BgObtain the dynamic of gas storage
The corresponding pore volume V of state reserves.Wherein, wherein W is the-corresponding net water influxs of reservoir average pressure P, can be by gas reservoir engineering
Method or method for numerical simulation obtain；F (P) be net water influx and reservoir pressure meet functional relation (such as net water influx and
The recurrence of reservoir average pressure has functional relation, to calculate the net water influx of any reservoir pressure)；G be gas reservoir protection reserves by
Gas reservoir engineering method or method for numerical simulation obtain, to calculate the corresponding pore volume of dynamic holdup；BgIt is natural gas in original
Volume factor when beginning pressure.
In the embodiment of the present invention, the gas-water interface of gas storage is different from the flat shape that normal gas pools are developed, and the present invention is real
It can be arbitrary surface to apply gas-water interface in example, indicated by net water influx：
Wmax=f (Pmax)
Wmin=f (Pmin)
Wab=f (Pab)
In formula, PmaxmGas storage pressure upper limit, MPa；PminmGas storage threshold pression, MPa；PabFor gas storage reconstruction when it is former
Beginning gas reservoir pressure, MPa.
Step S102, it is divided according to the pore volume that the variation relation occupies the gas reservoir protection reserves of the gas storage
For gas area, air water interactive areas and three, pool gas storage fluid mass (as shown in Figure 2), and calculate each gas storage fluid mass
To the pore volume of gas reservoir protection reserves contribution.Specifically：
Gas area is located at the reservoir of the corresponding gas-water interface of gas storage threshold pression or more, and the gas storage operation phase is constantly in
Gas zone state；Utilize the corresponding net water influx W of gas storage threshold pressionminIt is corresponding with initial reservoir pressure when gas storage reconstruction
Net water influx Wab, calculate the gas net water influx W in area1=Wab-Wmin；
According to the net water influx W in gas area1Calculate the pore volume V that the gas area contributes gas reservoir protection reserves1=W1/(1-
Swc1-Sgr1)；
Air water interactive areas is located at the reservoir between gas storage threshold pression gas-water interface corresponding with threshold pression, gas storage
Fill the areas Qi Shiweiqi, gas production latter stage is pool；Utilize the corresponding net water influx W of gas storage threshold pressionminWith the gas storage upper limit
The corresponding net water influx W of pressuremax, calculate the air water net water influx W in interactive areas2=Wmax-Wmin；
According to the net water influx W in the air water interactive areas2Calculate the hole that the gas reservoir protection reserves are contributed in air water interactive areas
Gap volume V2=W2/(1-Swc2-Sgr2)；
Pool is located at the corresponding gas-water interface of gas storage pressure upper limit reservoir below, and the gas storage operation phase is constantly in
Water logging state；The net water influx W in pool3Net water influx W corresponding equal to gas storage pressure upper limitmax；
According to the net water influx W in pool3Calculate the pore volume V that the gas reservoir protection reserves are contributed in the pool3=W3/
(1-Swc3-Sgr3)；
Wherein, Swc1、Swc2And Swc3The respectively constraint art saturation degree in gas area, air water interactive areas and pool, Sgr1、Sgr2With
Sgr3The residual gas saturation degree that respectively gas area, air water interactive areas and pool are generated by water enchroachment (invasion).
Step S103, the pore volume that gas reservoir protection reserves are contributed is corresponded to according to each gas storage fluid mass and is deducted respectively
It cannot be used for the pore volume of gas storage in a gas storage fluid mass.Specifically：
According to formula Δ V1=(Swc1n-Swc1+Sgr1n)V1Obtain the pore volume Δ that cannot be used for gas storage in gas area
V1；
According to formula Δ V2=(Swc2n-Swc2+Sgr2n)V2Obtain the hole that cannot be used for gas storage in air water interactive areas
Volume delta V2；
According to formula Δ V3=(1-Swc3)V3Obtain the pore volume Δ V that cannot be used for gas storage in pool3；
Wherein, Swc1n、Swc2nAnd Swc3nThe respectively constraint in gas storage stable operation Shi Qi area, air water interactive areas and pool
Art saturation degree.
Step S104, on the basis of deducting the pore volume that cannot be used for gas storage in each gas storage fluid mass,
Calculate the storage capacity of gas storage.Specifically：
According to formula VV=V- Δs V1-ΔV2-ΔV3Obtain the pore volume V that gas storage is used for gas storageV；
According to formula Gg=VV/BgThe storage capacity G of acquisitiong；
Wherein, BgFor volume factor of the natural gas in reset pressure.
In the embodiment of the present invention, above-mentioned Swc1、Swc2And Swc3, Sgr1、Sgr2And Sgr3And Swc1n、Swc2nAnd Swc3nIt can pass through
Following manner obtains：
Corresponding gas storage Seepage Experiment is separately designed according to the feature of each gas storage fluid mass, and passes through gas storage
Seepage Experiment measures the constraint art saturation degree S of each gas storage fluid masswc1、Swc2And Swc3, residual gas saturation degree Sgr1、
Sgr2And Sgr3And constraint art saturation degree S when gas storage stable operationwc1n、Swc2nAnd Swc3n.Specifically：
1. gas drive water is tested, the physical process of gas area's gas injection expelling water is described.Obtain the endpoint value saturation degree in gas area：Obtain gas
Area fetters art saturation degree Swc1, residual gas saturation S that gas area is generated because of water enchroachment (invasion)wc1, the constraint of gas storage stable operation gas area
Art saturation degree Swc1n, residual gas saturation S that gas storage stable operation gas area is generated because of water enchroachment (invasion)wc1n。
2. gas drive water-water drive gas experiment, describes the physical process of the mutual displacement of air water interactive areas air water, obtains air water interactive areas
Endpoint value saturation degree：Air water interactive areas fetters art saturation degree Swc2, residual gas that air water interactive areas is generated because of water enchroachment (invasion) saturation
Spend Swc2, gas storage stable operation air water interactive areas fetters art saturation degree Swc2n, gas storage stable operation air water interactive areas is because of water
The residual gas saturation S for invading and generatingwc2n。
3. water drive gas is tested, the physical process of pool water drive gas is described, the endpoint value saturation degree in pool is obtained：Pool fetters
Art saturation degree Swc3, residual gas saturation S that pool is generated because of water enchroachment (invasion)wc3, gas storage stable operation pool fetters art saturation
Spend Swc3n, residual gas saturation S that gas storage stable operation pool is generated because of water enchroachment (invasion)wc3n。
It is corresponding with the method that the embodiment of the present invention is above-mentioned, as shown in figure 3, the acquisition of the embodiment of the present invention is changed by watered-out gas reservoir
The device of the storage capacity of the gas storage built up includes variation relation acquisition module 31, pore volume division module 32, volume deduction
Module 33 and storage capacity computing module 34.Wherein：
Variation relation acquisition module 31, the variation relation that the gas-water interface for obtaining gas storage changes with reservoir pressure.
Specifically, obtaining the relationship of the net water influx and reservoir pressure of gas-water interface according to formula W=f (P)；According to formula V=G × Bg
Obtain the corresponding pore volume V of dynamic holdup of gas storage.Wherein, wherein W is-the corresponding water purifications of reservoir average pressure P invade
Amount, can be obtained by gas reservoir engineering method or method for numerical simulation；F (P) is net water influx and the functional relation that reservoir pressure meets
(such as net water influx and the recurrence of reservoir average pressure have functional relation, to calculate the net water influx of any reservoir pressure)；G is
Gas reservoir protection reserves are obtained by gas reservoir engineering method or method for numerical simulation, to calculate the corresponding pore volume of dynamic holdup；
BgFor volume factor of the natural gas in reset pressure.
In the embodiment of the present invention, the gas-water interface of gas storage is different from the flat shape that normal gas pools are developed, and the present invention is real
It can be arbitrary surface to apply gas-water interface in example, indicated by net water influx：
Wmax=f (Pmax)
Wmin=f (Pmin)
Wab=f (Pab)
In formula, PmaxmGas storage pressure upper limit, MPa；PminmGas storage threshold pression, MPa；PabFor gas storage reconstruction when it is former
Beginning gas reservoir pressure, MPa.
Pore volume division module 32, for being occupied the gas reservoir protection reserves of the gas storage according to the variation relation
Pore volume be divided into gas area, air water interactive areas and three, pool gas storage fluid mass, and calculate each gas storage fluid
The pore volume that the gas reservoir protection reserves are contributed in region.Specifically：
Gas area is located at the reservoir of the corresponding gas-water interface of gas storage threshold pression or more, and the gas storage operation phase is constantly in
Gas zone state；Utilize the corresponding net water influx W of gas storage threshold pressionminIt is corresponding with initial reservoir pressure when gas storage reconstruction
Net water influx Wab, calculate the gas net water influx W in area1=Wab-Wmin；
According to the net water influx W in gas area1Calculate the pore volume V that the gas area contributes gas reservoir protection reserves1=W1/(1-
Swc1-Sgr1)；
Air water interactive areas is located at the reservoir between gas storage threshold pression gas-water interface corresponding with threshold pression, gas storage
Fill the areas Qi Shiweiqi, gas production latter stage is pool；Utilize the corresponding net water influx W of gas storage threshold pressionminWith the gas storage upper limit
The corresponding net water influx W of pressuremax, calculate the air water net water influx W in interactive areas2=Wmax-Wmin；
According to the net water influx W in the air water interactive areas2Calculate the hole that the gas reservoir protection reserves are contributed in air water interactive areas
Gap volume V2=W2/(1-Swc2-Sgr2)；
Pool is located at the corresponding gas-water interface of gas storage pressure upper limit reservoir below, and the gas storage operation phase is constantly in
Water logging state；The net water influx W in pool3Net water influx W corresponding equal to gas storage pressure upper limitmax；
According to the net water influx W in pool3Calculate the pore volume V that the gas reservoir protection reserves are contributed in the pool3=W3/
(1-Swc3-Sgr3)；
Wherein, Swc1、Swc2And Swc3The respectively constraint art saturation degree in gas area, air water interactive areas and pool, Sgr1、Sgr2With
Sgr3The residual gas saturation degree that respectively gas area, air water interactive areas and pool are generated by water enchroachment (invasion).
Volume deducts module 33, the hole for being contributed the gas reservoir protection reserves according to each gas storage fluid mass
Volume corresponds to the pore volume for deducting and cannot be used for gas storage in each gas storage fluid mass.Specifically：
According to formula Δ V1=(Swc1n-Swc1+sgr1n)V1Obtain the pore volume Δ that cannot be used for gas storage in gas area
V1；
According to formula Δ V2=(Swc2n-Swc2+Sgr2n)V2Obtain the hole that cannot be used for gas storage in air water interactive areas
Volume delta V2；
According to formula Δ V3=(1-Swc3)V3Obtain the pore volume Δ V that cannot be used for gas storage in pool3；
Wherein, Swc1n、Swc2nAnd Swc3nThe respectively constraint in gas storage stable operation Shi Qi area, air water interactive areas and pool
Art saturation degree.
Storage capacity computing module 34, for cannot be used for gas storage in deduction each gas storage fluid mass
On the basis of pore volume, the storage capacity of the gas storage is calculated.Specifically：
According to formula VV=V- Δs V1-ΔV2-ΔV3Obtain the pore volume V that gas storage is used for gas storageV；
According to formula Gg=VV/BgThe storage capacity G of acquisitiong；
Wherein, BgFor volume factor of the natural gas in reset pressure.
In the embodiment of the present invention, above-mentioned Swc1、Swc2And Swc3, Sgr1、Sgr2And Sgr3And Swc1n、Swc2nAnd Swc3nIt can pass through
The mode of above method embodiment obtains, and is repeated no more secondary.
It can be seen that the embodiment of the present invention does not take dynamic holdup directly when calculating storage capacity as the prior art
Numerical value, but the pore volume that dynamic holdup occupies is divided into these three gas storage fluids of gas area, air water interactive areas and pool
Region cannot be used for the storage of gas storage gas after deducting the dynamic holdup gas storage reconstruction of each gas storage fluid mass respectively
Pore volume, therefore, the result of calculation accuracy of the embodiment of the present invention increase substantially, and with the increasing of Gas Reservoir Water ability of immigrants
By force, the computational accuracy of the embodiment of the present invention can further increase, and technical advantage highlights, so as to be provided for gas storage evaluation early period
Accurate storage capacity technical parameter.
Those skilled in the art will also be appreciated that various illustrative components, blocks, unit and the step that the embodiment of the present invention is listed
Suddenly it can be realized by the combination of hardware, software or both.It is realized to hardware or software is then passed through depending on specific
Application and whole system design requirement.Those skilled in the art can use various each specific application
Method realizes the function, but this realization is understood not to the range beyond protection of the embodiment of the present invention.
Various illustrative logical blocks or unit described in the embodiment of the present invention can by general processor,
Digital signal processor, application-specific integrated circuit (ASIC), field programmable gate array or other programmable logic devices, discrete gate
Or described function is realized or is operated in transistor logic, the design of discrete hardware components or any of the above described combination.General place
It can be microprocessor to manage device, and optionally, which may be any traditional processor, controller, microcontroller
Device or state machine.Processor can also be realized by the combination of computing device, such as digital signal processor and microprocessor,
Multi-microprocessor, one or more microprocessors combine a digital signal processor core or any other like configuration
To realize.
The step of method described in the embodiment of the present invention or algorithm can be directly embedded into hardware, processor execute it is soft
The combination of part module or the two.Software module can be stored in RAM memory, flash memory, ROM memory, EPROM storages
Other any form of storaging mediums in device, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this field
In.Illustratively, storaging medium can be connect with processor, so that processor can read information from storaging medium, and
It can be to storaging medium stored and written information.Optionally, storaging medium can also be integrated into processor.Processor and storaging medium can
To be set in ASIC, ASIC can be set in user terminal.Optionally, processor and storaging medium can also be set to use
In different components in the terminal of family.
In one or more illustrative designs, above-mentioned function described in the embodiment of the present invention can be in hardware, soft
Part, firmware or the arbitrary of this three combine to realize.If realized in software, these functions can store and computer-readable
On medium, or with one or more instruction or code form be transmitted on the medium of computer-readable.Computer readable medium includes electricity
Brain storaging medium and convenient for allow computer program to be transferred to from a place telecommunication media in other places.Storaging medium can be with
It is that any general or special computer can be with the useable medium of access.For example, such computer readable media may include but
It is not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage devices or other
What can be used for carry or store with instruct or data structure and it is other can be by general or special computer or general or specially treated
The medium of the program code of device reading form.In addition, any connection can be properly termed computer readable medium, example
Such as, if software is to pass through a coaxial cable, fiber optic cables, double from a web-site, server or other remote resources
Twisted wire, Digital Subscriber Line (DSL) are defined with being also contained in for the wireless way for transmitting such as example infrared, wireless and microwave
In computer readable medium.The disk (disk) and disk (disc) includes compress disk, radium-shine disk, CD, DVD, floppy disk
And Blu-ray Disc, disk is usually with magnetic duplication data, and disk usually carries out optical reproduction data with laser.Combinations of the above
It can also be included in computer readable medium.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
Describe in detail it is bright, it should be understood that the above is only a specific embodiment of the present invention, the guarantor being not intended to limit the present invention
Range is protected, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in this
Within the protection domain of invention.
Claims (8)
1. a kind of method for the storage capacity obtaining the gas storage reconstructed by watered-out gas reservoir, which is characterized in that include the following steps：
Obtain the variation relation that the gas-water interface of gas storage changes with reservoir pressure；
The pore volume that the gas reservoir protection reserves of the gas storage occupy is divided into gas area according to the variation relation, air water is handed over
Mutual area and three, pool gas storage fluid mass, and calculate what the gas reservoir protection reserves were contributed in each gas storage fluid mass
Pore volume；
The pore volume that the gas reservoir protection reserves are contributed is corresponded to according to each gas storage fluid mass and deducts each gas storage
It cannot be used for the pore volume of gas storage in fluid mass；
On the basis of deducting the pore volume that cannot be used for gas storage in each gas storage fluid mass, the storage is calculated
The storage capacity of air reservoir；Wherein：
It is described that the pore volume that the gas reservoir protection reserves of the gas storage occupy is divided by gas area, gas according to the variation relation
Water interactive areas and three, pool gas storage fluid mass, and each gas storage fluid mass is calculated to the gas reservoir protection reserves tribute
The pore volume offered, including：
Utilize the corresponding net water influx W of gas storage threshold pressionminWater purification corresponding with initial reservoir pressure when gas storage reconstruction
The amount of invading Wab, calculate the gas net water influx W in area1=Wab-Wmin；
According to the net water influx W in the gas area1Calculate the pore volume V that the gas area contributes the gas reservoir protection reserves1=W1/
(1-Swc1-Sgr1)；
Utilize the corresponding net water influx W of gas storage threshold pressionminNet water influx W corresponding with gas storage pressure upper limitmax, calculate
The net water influx W in air water interactive areas2=Wmax-Wmin；
According to the net water influx W in the air water interactive areas2Calculate the hole that the gas reservoir protection reserves are contributed in the air water interactive areas
Volume V2=W2/(1-Swc2-Sgr2)；
The net water influx W in pool3Net water influx W corresponding equal to gas storage pressure upper limitmax；
According to the net water influx W in pool3Calculate the pore volume V that the gas reservoir protection reserves are contributed in the pool3=W3/(1-
Swc3-Sgr3)；
Described corresponded to the pore volume that the gas reservoir protection reserves are contributed according to each gas storage fluid mass deducts each storage
It cannot be used for the pore volume of gas storage in air reservoir fluid mass, including：
According to formula Δ V1=(Swc1n-Swc1+Sgr1n)V1Obtain the pore volume Δ V that cannot be used for gas storage in gas area1；
According to formula Δ V2=(Swc2n-Swc2+Sgr2n)V2Obtain the pore volume Δ that cannot be used for gas storage in air water interactive areas
V2；
According to formula Δ V3=(1-Swc3)V3Obtain the pore volume Δ V that cannot be used for gas storage in pool3；
Wherein, Swc1、Swc2And Swc3The respectively constraint art saturation degree in gas area, air water interactive areas and pool, Sgr1、Sgr2And Sgr3Point
The residual gas saturation degree that the areas Bie Weiqi, air water interactive areas and pool are generated by water enchroachment (invasion)；Swc1n、Swc2nAnd Swc3nRespectively store up
The constraint art saturation degree in the areas air reservoir stable operation Shi Qi, air water interactive areas and pool.
2. the method for the storage capacity according to claim 1 for obtaining the gas storage reconstructed by watered-out gas reservoir, feature exist
In, the variation relation that the gas-water interface for obtaining gas storage changes with reservoir pressure, including：
The relationship of the net water influx and reservoir pressure of gas-water interface is obtained according to formula W=f (P)；
According to formula V=G × BgObtain the corresponding pore volume V of dynamic holdup of gas storage；
Wherein, W is the corresponding net water influxs of pressure P, and f (P) is net water influx and the functional relation that reservoir pressure meets, and G is gas
Hide dynamic holdup, BgFor volume factor of the natural gas in reset pressure.
3. the method for the storage capacity according to claim 1 for obtaining the gas storage reconstructed by watered-out gas reservoir, feature exist
In the Swc1、Swc2And Swc3, Sgr1、Sgr2And Sgr3And Swc1n、Swc2nAnd Swc3nIt obtains in the following manner：
Corresponding gas storage Seepage Experiment is separately designed according to the feature of each gas storage fluid mass, and passes through the gas storage
Seepage Experiment measures the constraint art saturation degree S of each gas storage fluid masswc1、Swc2And Swc3, residual gas saturation degree Sgr1、
Sgr2And Sgr3And constraint art saturation degree S when gas storage stable operationwc1n、Swc2nAnd Swc3n。
4. the method for the storage capacity according to claim 3 for obtaining the gas storage reconstructed by watered-out gas reservoir, feature exist
In, it is described on the basis of deducting the pore volume that cannot be used for gas storage in each gas storage fluid mass, calculate institute
The storage capacity of gas storage is stated, including：
According to formula VV=V- Δs V1-ΔV2-ΔV3Obtain the pore volume V that gas storage is used for gas storageV；
According to formula Gg=VV/BgThe storage capacity G of acquisitiong；
Wherein, BgFor volume factor of the natural gas in reset pressure.
5. a kind of device for the storage capacity obtaining the gas storage reconstructed by watered-out gas reservoir, which is characterized in that including：
Variation relation acquisition module, the variation relation that the gas-water interface for obtaining gas storage changes with reservoir pressure；
Pore volume division module, the hole for being occupied the gas reservoir protection reserves of the gas storage according to the variation relation
Volume is divided into gas area, air water interactive areas and three, pool gas storage fluid mass, and calculates each gas storage fluid mass pair
The pore volume of the gas reservoir protection reserves contribution；
Volume deducts module, the pore volume pair for being contributed the gas reservoir protection reserves according to each gas storage fluid mass
The pore volume that cannot be used for gas storage in each gas storage fluid mass should be deducted；
Storage capacity computing module, for deducting the pore-body that cannot be used for gas storage in each gas storage fluid mass
On the basis of product, the storage capacity of the gas storage is calculated；Wherein：
It is described that the pore volume that the gas reservoir protection reserves of the gas storage occupy is divided by gas area, gas according to the variation relation
Water interactive areas and three, pool gas storage fluid mass, and each gas storage fluid mass is calculated to the gas reservoir protection reserves tribute
The pore volume offered, including：
Utilize the corresponding net water influx W of gas storage threshold pressionminWater purification corresponding with initial reservoir pressure when gas storage reconstruction
The amount of invading Wab, calculate the gas net water influx W in area1=Wab-Wmin；
According to the net water influx W in the gas area1Calculate the pore volume V that the gas area contributes the gas reservoir protection reserves1=W1/
(1-Swc1-Sgr1)；
Utilize the corresponding net water influx W of gas storage threshold pressionminNet water influx W corresponding with gas storage pressure upper limitmax, calculate
The net water influx W in air water interactive areas2=Wmax-Wmin；
According to the net water influx W in the air water interactive areas2Calculate the hole that the gas reservoir protection reserves are contributed in the air water interactive areas
Volume V2=W2/(1-Swc2-Sgr2)；
The net water influx W in pool3Net water influx W corresponding equal to gas storage pressure upper limitmax；
According to the net water influx W in pool3Calculate the pore volume V that the gas reservoir protection reserves are contributed in the pool3=W3/(1-
Swc3-Sgr3)；
Described corresponded to the pore volume that the gas reservoir protection reserves are contributed according to each gas storage fluid mass deducts each storage
It cannot be used for the pore volume of gas storage in air reservoir fluid mass, including：
According to formula Δ V1=(Swc1n-Swc1+Sgr1n)V1Obtain the pore volume Δ V that cannot be used for gas storage in gas area1；
According to formula Δ V2=(Swc2n-Swc2+Sgr2n)V2Obtain the pore volume Δ that cannot be used for gas storage in air water interactive areas
V2；
According to formula Δ V3=(1-Swc3)V3Obtain the pore volume Δ V that cannot be used for gas storage in pool3；
Wherein, Swc1、Swc2And Swc3The respectively constraint art saturation degree in gas area, air water interactive areas and pool, Sgr1、Sgr2And Sgr3Point
The residual gas saturation degree that the areas Bie Weiqi, air water interactive areas and pool are generated by water enchroachment (invasion)；Swc1n、Swc2nAnd Swc3nRespectively store up
The constraint art saturation degree in the areas air reservoir stable operation Shi Qi, air water interactive areas and pool.
6. the device of the storage capacity according to claim 5 for obtaining the gas storage reconstructed by watered-out gas reservoir, feature exist
In, the variation relation that the gas-water interface for obtaining gas storage changes with reservoir pressure, including：
The relationship of the net water influx and reservoir pressure of gas-water interface is obtained according to formula W=f (P)；
According to formula V=G × BgObtain the corresponding pore volume V of dynamic holdup of gas storage；
Wherein, W is the corresponding net water influxs of pressure P, and f (P) is net water influx and the functional relation that reservoir pressure meets, and G is gas
Hide dynamic holdup, BgFor volume factor of the natural gas in reset pressure.
7. the device of the storage capacity according to claim 5 for obtaining the gas storage reconstructed by watered-out gas reservoir, feature exist
In the Swc1、Swc2And Swc3, Sgr1、Sgr2And Sgr3And Swc1n、Swc2nAnd Swc3nIt obtains in the following manner：
Corresponding gas storage Seepage Experiment is separately designed according to the feature of each gas storage fluid mass, and passes through the gas storage
Seepage Experiment measures the constraint art saturation degree S of each gas storage fluid masswc1、Swc2And Swc3, residual gas saturation degree Sgr1、
Sgr2And Sgr3And constraint art saturation degree S when gas storage stable operationwc1n、Swc2nAnd Swc3n。
8. the device of the storage capacity according to claim 7 for obtaining the gas storage reconstructed by watered-out gas reservoir, feature exist
In, it is described on the basis of deducting the pore volume that cannot be used for gas storage in each gas storage fluid mass, calculate institute
The storage capacity of gas storage is stated, including：
According to formula VV=V- Δs V1-ΔV2-ΔV3Obtain the pore volume V that gas storage is used for gas storageV；
According to formula Gg=VV/BgThe storage capacity G of acquisitiong；
Wherein, BgFor volume factor of the natural gas in reset pressure.
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| CN109858701B (en) * | 2019-02-12 | 2021-04-16 | 中国石油大学(北京) | Quantitative identification method and system for water invasion of fractured edge water-gas reservoir |
| CN109916799B (en) * | 2019-03-22 | 2021-04-20 | 西南石油大学 | Experimental method for measuring unconventional dense gas reservoir spontaneous imbibition relative permeability |
| CN112434474A (en) * | 2020-11-05 | 2021-03-02 | 中国石油天然气股份有限公司 | Method for evaluating working gas quantity by pressure limiting force of gas storage under fixed condition |
| CN116401848B (en) * | 2023-03-30 | 2023-09-29 | 东北石油大学 | Method for determining effective reservoir capacity of flooding volatile oil reservoir reconstruction gas reservoir |
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