CN104484550A - Method and device for obtaining storage capacity of gas storage reconstructed from watered gas reservoir - Google Patents
Method and device for obtaining storage capacity of gas storage reconstructed from watered gas reservoir Download PDFInfo
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- CN104484550A CN104484550A CN201410636368.7A CN201410636368A CN104484550A CN 104484550 A CN104484550 A CN 104484550A CN 201410636368 A CN201410636368 A CN 201410636368A CN 104484550 A CN104484550 A CN 104484550A
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Abstract
The invention provides a method and a device for obtaining the storage capacity of a gas storage reconstructed from a watered gas reservoir. The method comprises the steps of obtaining the relationship of the gas-water interface of the gas storage changing along with the pressure change of the reservoir, dividing the pore volume occupied by the dynamic reserves of the gas reservoir of the gas storage into three gas storage fluid regions, namely a gas region, a gas-water interaction region and a water region, according to the changing relationship, and calculating the contributed pore volume of each gas storage fluid region to the dynamic reserves of the gas reservoir, correspondingly deducting the pore volume unavailable for gas storing in each gas storage fluid region according to the contributed pore volume of each gas storage fluid region to the dynamic reserves of the gas reservoir, and calculating the storage capacity of the gas storage on the basis of deducting the pore volume unavailable for gas storing in each gas storage fluid region. The method for obtaining the storage capacity of the gas storage reconstructed from the watered gas reservoir is relatively high in calculation result accuracy; besides, the calculation accuracy is further improved along with the enhancement of the water body capacity of the gas reservoir, and therefore, accurate storage capacity technical parameters can be provided for earlier-stage evaluation of the gas storage.
Description
Technical field
The present invention relates to natural gas storage and technical field, especially relates to the method and apparatus of the storage capacity of the gas storage that a kind of acquisition is reconstructed by watered-out gas reservoir.
Background technology
Gas storage is the powerful measure regulating gas distributing system balance between supply and demand, and the important indicator weighing gas storage regulating power is storage capacity, accurately calculates the technical barrier that storage capacity is puzzlement related scientific research personnel.
At present, storage capacity after watered-out gas reservoir gas storage reconstruction generally gets dynamic holdup numerical value, (as the article " determination of hypotonic lithologic gas reservoirs reconstruction underground natural gas storage Working gas capacity " of document volume the 12nd Dec the 31st in 2012 phase " Oil & Gas Storage ", and the computing method introduced of the article in volume the 3rd May the 20th in 2013 phase " fault-blcok oil-gas field " " phase of not closing hide build Kuku be installed with meter ").Such computing method are thought, will be used for gas storage gas storage completely after the volume of voids gas storage reconstruction occupied by dynamic holdup.But in the engineering of existing watered-out gas reservoir gas storage reconstruction, do not consider the impact of water enchroachment (invasion) on reservoir, mistakenly the volume of voids that a part of dynamic holdup occupies is calculated as the gas storage volume of voids being used for gas storage after building storehouse, cause design library capacity bigger than normal, and the increase along with water influx rate expand by this deviation.
Summary of the invention
The method and apparatus of the storage capacity of the gas storage that the object of the present invention is to provide a kind of acquisition to be reconstructed by watered-out gas reservoir, to obtain the storage capacity of the gas storage reconstructed by watered-out gas reservoir more accurately.
For achieving the above object, on the one hand, the invention provides the method for the storage capacity of the gas storage that a kind of acquisition is reconstructed by watered-out gas reservoir, comprise the following steps:
The variation relation that the gas-water interface obtaining gas storage changes with reservoir pressure;
According to described variation relation, the volume of voids that the gas reservoir protection reserves of described gas storage occupy is divided into gas district, air water interactive areas and gas storage fluid mass, three, pool, and calculates the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves;
According to each gas storage fluid mass, the volume of voids that can not be used for gas storage in each gas storage fluid mass is deducted to the volume of voids correspondence that described gas reservoir protection reserves are contributed;
For the volume of voids basis of gas storage, the storage capacity of described gas storage can not be calculated in deduction each gas storage fluid mass described.
The method of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, the variation relation that the gas-water interface of described acquisition gas storage changes with reservoir pressure, comprising:
The clean water influx rate of gas-water interface and the relation of reservoir pressure is obtained according to formula W=f (P);
According to formula V=G × B
gobtain the volume of voids V that the dynamic holdup of gas storage is corresponding;
Wherein, W is clean water influx rate corresponding to pressure P, the funtcional relationship that f (P) meets for clean water influx rate and reservoir pressure, and G is gas reservoir protection reserves, B
gfor the volume factor of rock gas when virgin pressure.
The method of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, describedly according to described variation relation, the volume of voids that the gas reservoir protection reserves of described gas storage occupy is divided into gas district, air water interactive areas and gas storage fluid mass, three, pool, and calculate the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves, comprising:
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with initial reservoir pressure during gas storage reconstruction
ab, calculate the clean water influx rate W in gas district
1=W
ab-W
min;
According to the described clean water influx rate W in gas district
1calculate the volume of voids V that described gas district contributes described gas reservoir protection reserves
1=W
1/ (1-S
wc1-S
gr1);
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with gas storage pressure upper limit
max, calculate the clean water influx rate W in air water interactive areas
2=W
max-W
min;
According to the described clean water influx rate W in air water interactive areas
2calculate the volume of voids V that described air water interactive areas is contributed described gas reservoir protection reserves
2=W
2/ (1-S
wc2-S
gr2);
The clean water influx rate W in pool
3equal the clean water influx rate W that gas storage pressure upper limit is corresponding
max;
According to the clean water influx rate W in pool
3calculate the volume of voids V that described pool is contributed described gas reservoir protection reserves
3=W
3/ (1-S
wc3-S
gr3);
Wherein, S
wc1, S
wc2and S
wc3be respectively the constraint art saturation degree in gas district, air water interactive areas and pool, S
gr1, S
gr2and S
gr3be respectively the residual gas saturation degree that gas district, air water interactive areas and pool produce because of water enchroachment (invasion).
The method of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, the volume of voids of gas storage can not be used in described each gas storage fluid mass of volume of voids correspondence deduction of described gas reservoir protection reserves being contributed according to each gas storage fluid mass, comprise:
According to formula Δ V
1=(S
wc1n-S
wc1+ S
gr1n) V
1obtain the volume of voids Δ V that can not be used for gas storage in gas district
1;
According to formula Δ V
2=(S
wc2n-S
wc2+ S
gr2n) V
2obtain the volume of voids Δ V that can not be used for gas storage in air water interactive areas
2;
According to formula Δ V
3=(1-S
wc3) V
3obtain the volume of voids Δ V that can not be used for gas storage in pool
3;
Wherein, S
wc1n, S
wc2nand S
wc3nbe respectively the constraint art saturation degree in gas storage stable operation Shi Qi district, air water interactive areas and pool.
The method of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, described S
wc1, S
wc2and S
wc3, S
gr1, S
gr2and S
gr3, and S
wc1n, S
wc2nand S
wc3nobtain in the following manner:
Design corresponding gas storage Seepage Experiment respectively according to the feature of each gas storage fluid mass, and recorded the constraint art saturation degree S of each gas storage fluid mass by described gas storage Seepage Experiment
wc1, S
wc2and S
wc3, residual gas saturation degree S
gr1, S
gr2and S
gr3, and constraint art saturation degree S during gas storage stable operation
wc1n, S
wc2nand S
wc3n.
The method of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, describedly for the volume of voids basis of gas storage, can not calculate the storage capacity of described gas storage, comprising in deduction each gas storage fluid mass described:
According to formula V
v=V-Δ V
1-Δ V
2-Δ V
3obtain the volume of voids V that gas storage is used for gas storage
v;
According to formula G
g=V
v/ B
gthe storage capacity G obtained
g;
Wherein, B
gfor the volume factor of rock gas when virgin pressure.
On the other hand, present invention also offers the device of the storage capacity of the gas storage that a kind of acquisition is reconstructed by watered-out gas reservoir, comprising:
Variation relation acquisition module, the variation relation that the gas-water interface for obtaining gas storage changes with reservoir pressure;
Volume of voids divides module, for the volume of voids that the gas reservoir protection reserves of described gas storage occupy being divided into gas district, air water interactive areas and gas storage fluid mass, three, pool according to described variation relation, and calculate the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves;
Volume less module, for deducting the volume of voids that can not be used for gas storage in each gas storage fluid mass according to each gas storage fluid mass to the volume of voids correspondence that described gas reservoir protection reserves are contributed;
Storage capacity computing module, for for the volume of voids basis of gas storage, not calculating the storage capacity of described gas storage in deduction each gas storage fluid mass described.
The device of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, the variation relation that the gas-water interface of described acquisition gas storage changes with reservoir pressure, comprising:
The clean water influx rate of gas-water interface and the relation of reservoir pressure is obtained according to formula W=f (P);
According to formula V=G × B
gobtain the volume of voids V that the dynamic holdup of gas storage is corresponding;
Wherein, W is clean water influx rate corresponding to pressure P, the funtcional relationship that f (P) meets for clean water influx rate and reservoir pressure, and G is gas reservoir protection reserves, B
gfor the volume factor of rock gas when virgin pressure.
The device of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, describedly according to described variation relation, the volume of voids that the gas reservoir protection reserves of described gas storage occupy is divided into gas district, air water interactive areas and gas storage fluid mass, three, pool, and calculate the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves, comprising:
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with initial reservoir pressure during gas storage reconstruction
ab, calculate the clean water influx rate W in gas district
1=W
ab-W
min;
According to the described clean water influx rate W in gas district
1calculate the volume of voids V that described gas district contributes described gas reservoir protection reserves
1=W
1/ (1-S
wc1-S
gr1);
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with gas storage pressure upper limit
max, calculate the clean water influx rate W in air water interactive areas
2=W
max-W
min;
According to the described clean water influx rate W in air water interactive areas
2calculate the volume of voids V that described air water interactive areas is contributed described gas reservoir protection reserves
2=W
2/ (1-S
wc2-S
gr2);
The clean water influx rate W in pool
3equal the clean water influx rate W that gas storage pressure upper limit is corresponding
max;
According to the clean water influx rate W in pool
3calculate the volume of voids V that described pool is contributed described gas reservoir protection reserves
3=W
3/ (1-S
wc3-S
gr3);
Wherein, S
wc1, S
wc2and S
wc3be respectively the constraint art saturation degree in gas district, air water interactive areas and pool, S
gr1, S
gr2and S
gr3be respectively the residual gas saturation degree that gas district, air water interactive areas and pool produce because of water enchroachment (invasion).
The device of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, the volume of voids of gas storage can not be used in described each gas storage fluid mass of volume of voids correspondence deduction of described gas reservoir protection reserves being contributed according to each gas storage fluid mass, comprise:
According to formula Δ V
1=(S
wc1n-S
wc1+ S
gr1n) V
1obtain the volume of voids Δ V that can not be used for gas storage in gas district
1;
According to formula Δ V
2=(S
wc2n-S
wc2+ S
gr2n) V
2obtain the volume of voids Δ V that can not be used for gas storage in air water interactive areas
2;
According to formula Δ V
3=(1-S
wc3) V
3obtain the volume of voids Δ V that can not be used for gas storage in pool
3;
Wherein, S
wc1n, S
wc2nand S
wc3nbe respectively the constraint art saturation degree in gas storage stable operation Shi Qi district, air water interactive areas and pool.
The device of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, described S
wc1, S
wc2and S
wc3, S
gr1, S
gr2and S
gr3, and S
wc1n, S
wc2nand S
wc3nobtain in the following manner:
Design corresponding gas storage Seepage Experiment respectively according to the feature of each gas storage fluid mass, and recorded the constraint art saturation degree S of each gas storage fluid mass by described gas storage Seepage Experiment
wc1, S
wc2and S
wc3, residual gas saturation degree S
gr1, S
gr2and S
gr3, and constraint art saturation degree S during gas storage stable operation
wc1n, S
wc2nand S
wc3n.
The device of the storage capacity of the gas storage that acquisition of the present invention is reconstructed by watered-out gas reservoir, describedly for the volume of voids basis of gas storage, can not calculate the storage capacity of described gas storage, comprising in deduction each gas storage fluid mass described:
According to formula V
v=V-Δ V
1-Δ V
2-Δ V
3obtain the volume of voids V that gas storage is used for gas storage
v;
According to formula G
g=V
v/ B
gthe storage capacity G obtained
g;
Wherein, B
gfor the volume factor of rock gas when virgin pressure.
The embodiment of the present invention is when calculating storage capacity, as prior art, directly do not get the numerical value of dynamic holdup, but the volume of voids occupied by dynamic holdup is divided into gas district, air water interactive areas and these three gas storage fluid masses, pool, the volume of voids of gas storage gas storage can not be used for after deducting the dynamic holdup gas storage reconstruction of each gas storage fluid mass respectively, therefore, the result of calculation accuracy of the embodiment of the present invention increases substantially, and along with the enhancing of Gas Reservoir Water ability of immigrants, the computational accuracy of the embodiment of the present invention can improve further, technical advantage highlights, thus can be gas storage early stage evaluate storage capacity technical parameter is accurately provided.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the method flow diagram of the storage capacity of the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir;
Fig. 2 is gas storage volume of voids segmentation schematic diagram in the method for the storage capacity of the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir;
Fig. 3 is the structured flowchart of the storage capacity of the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment and accompanying drawing, the present invention is described in further details.At this, schematic description and description of the present invention is for explaining the present invention, but not as a limitation of the invention.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Shown in figure 1, the method for the storage capacity of the gas storage that the acquisition of the embodiment of the present invention is reconstructed by watered-out gas reservoir comprises the following steps:
The variation relation that step S101, the gas-water interface obtaining gas storage change with reservoir pressure.Concrete, obtain the clean water influx rate of gas-water interface and the relation of reservoir pressure according to formula W=f (P); According to formula V=G × B
gobtain the volume of voids V that the dynamic holdup of gas storage is corresponding.Wherein, wherein, W is-clean water influx rate that reservoir mean pressure P is corresponding, can be obtained by gas reservoir engineering method or method for numerical simulation; The funtcional relationship (such as clean water influx rate and reservoir mean pressure return and have functional relation, to calculate the clean water influx rate of arbitrary reservoir pressure) that f (P) meets for clean water influx rate and reservoir pressure; G is that gas reservoir protection reserves are obtained by gas reservoir engineering method or method for numerical simulation, to calculate volume of voids corresponding to dynamic holdup; B
gfor the volume factor of rock gas when virgin 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 is developed, and in the embodiment of the present invention, gas-water interface can be arbitrary surface, is represented by clean water influx rate:
W
max＝f(P
max)
W
min＝f(P
min)
W
ab＝f(P
ab)
In formula, P
maxmgas storage pressure upper limit, MPa; P
minmgas storage threshold pression, MPa; P
abfor gas reservoir pressure original during gas storage reconstruction, MPa.
Step S102, according to described variation relation, the volume of voids that the gas reservoir protection reserves of described gas storage occupy is divided into gas district, air water interactive areas and three, pool gas storage fluid mass (as shown in Figure 2), and calculates the volume of voids each gas storage fluid mass contributed by gas reservoir protection reserves.Concrete:
Gas district is positioned at the reservoir of more than gas-water interface corresponding to gas storage threshold pression, and the gas storage operation phase is in gas zone state always; Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with initial reservoir pressure during gas storage reconstruction
ab, calculate the clean water influx rate W in gas district
1=W
ab-W
min;
According to the clean water influx rate W in gas district
1calculate the volume of voids V that described gas district contributes gas reservoir protection reserves
1=W
1/ (1-S
wc1-S
gr1);
The reservoir of air water interactive areas between the gas-water interface that gas storage threshold pression is corresponding with threshold pression, gas storage fills Qi Shiweiqi district, gas production latter stage is pool; Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with gas storage pressure upper limit
max, calculate the clean water influx rate W in air water interactive areas
2=W
max-W
min;
According to the described clean water influx rate W in air water interactive areas
2calculate the volume of voids V that air water interactive areas is contributed described gas reservoir protection reserves
2=W
2/ (1-S
wc2-S
gr2);
Pool is positioned at the reservoir of below gas-water interface corresponding to gas storage pressure upper limit, and the gas storage operation phase is in water logging state always; The clean water influx rate W in pool
3equal the clean water influx rate W that gas storage pressure upper limit is corresponding
max;
According to the clean water influx rate W in pool
3calculate the volume of voids V that described pool is contributed described gas reservoir protection reserves
3=W
3/ (1-S
wc3-S
gr3);
Wherein, S
wc1, S
wc2and S
wc3be respectively the constraint art saturation degree in gas district, air water interactive areas and pool, S
gr1, S
gr2and S
gr3be respectively the residual gas saturation degree that gas district, air water interactive areas and pool produce because of water enchroachment (invasion).
The volume of voids of gas storage can not be used in step S103, each gas storage fluid mass of volume of voids correspondence deduction of gas reservoir protection reserves being contributed according to each gas storage fluid mass.Concrete:
According to formula Δ V
1=(S
wc1n-S
wc1+ S
gr1n) V
1obtain the volume of voids Δ V that can not be used for gas storage in gas district
1;
According to formula Δ V
2=(S
wc2n-S
wc2+ S
gr2n) V
2obtain the volume of voids Δ V that can not be used for gas storage in air water interactive areas
2;
According to formula Δ V
3=(1-S
wc3) V
3obtain the volume of voids Δ V that can not be used for gas storage in pool
3;
Wherein, S
wc1n, S
wc2nand S
wc3nbe respectively the constraint art saturation degree in gas storage stable operation Shi Qi district, air water interactive areas and pool.
Step S104, can not for the volume of voids basis of gas storage in each gas storage fluid mass of deduction, calculate the storage capacity of gas storage.Concrete:
According to formula V
v=V-Δ V
1-Δ V
2-Δ V
3obtain the volume of voids V that gas storage is used for gas storage
v;
According to formula G
g=V
v/ B
gthe storage capacity G obtained
g;
Wherein, B
gfor the volume factor of rock gas when virgin pressure.
In the embodiment of the present invention, above-mentioned S
wc1, S
wc2and S
wc3, S
gr1, S
gr2and S
gr3, and S
wc1n, S
wc2nand S
wc3nby obtaining with under type:
Design corresponding gas storage Seepage Experiment respectively according to the feature of each gas storage fluid mass, and recorded the constraint art saturation degree S of each gas storage fluid mass by gas storage Seepage Experiment
wc1, S
wc2and S
wc3, residual gas saturation degree S
gr1, S
gr2and S
gr3, and constraint art saturation degree S during gas storage stable operation
wc1n, S
wc2nand S
wc3n.Concrete:
1. gas drive water experiment, describes the physical process of gas district gas injection expelling water.Obtain the endpoint value saturation degree in gas district: obtain gas district constraint art saturation degree S
wc1, the residual gas saturation S that gas district produces because of water enchroachment (invasion)
wc1, gas storage stable operation gas district constraint art saturation degree S
wc1n, the residual gas saturation S that gas storage stable operation gas district produces 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 the endpoint value saturation degree of air water interactive areas: air water interactive areas constraint art saturation degree S
wc2, the residual gas saturation S that air water interactive areas produces because of water enchroachment (invasion)
wc2, gas storage stable operation air water interactive areas constraint art saturation degree S
wc2n, the residual gas saturation S that gas storage stable operation air water interactive areas produces because of water enchroachment (invasion)
wc2n.
3. water drive gas experiment, describes the physical process of pool water drive gas, obtains the endpoint value saturation degree in pool: pool constraint art saturation degree S
wc3, the residual gas saturation S that pool produces because of water enchroachment (invasion)
wc3, gas storage stable operation pool constraint art saturation degree S
wc3n, the residual gas saturation S that gas storage stable operation pool produces because of water enchroachment (invasion)
wc3n.
The method above-mentioned with the embodiment of the present invention is corresponding, as shown in Figure 3, the storage capacity of gas storage reconstructed by watered-out gas reservoir of the acquisition of the embodiment of the present invention device comprises variation relation acquisition module 31, volume of voids divides module 32, volume less 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.Concrete, obtain the clean water influx rate of gas-water interface and the relation of reservoir pressure according to formula W=f (P); According to formula V=G × B
gobtain the volume of voids V that the dynamic holdup of gas storage is corresponding.Wherein, wherein, W is-clean water influx rate that reservoir mean pressure P is corresponding, can be obtained by gas reservoir engineering method or method for numerical simulation; The funtcional relationship (such as clean water influx rate and reservoir mean pressure return and have functional relation, to calculate the clean water influx rate of arbitrary reservoir pressure) that f (P) meets for clean water influx rate and reservoir pressure; G is that gas reservoir protection reserves are obtained by gas reservoir engineering method or method for numerical simulation, to calculate volume of voids corresponding to dynamic holdup; B
gfor the volume factor of rock gas when virgin 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 is developed, and in the embodiment of the present invention, gas-water interface can be arbitrary surface, is represented by clean water influx rate:
W
max＝f(P
max)
W
min＝f(P
min)
W
ab＝f(P
ab)
In formula, P
maxmgas storage pressure upper limit, MPa; P
minmgas storage threshold pression, MPa; P
abfor gas reservoir pressure original during gas storage reconstruction, MPa.
Volume of voids divides module 32, for the volume of voids that the gas reservoir protection reserves of described gas storage occupy being divided into gas district, air water interactive areas and gas storage fluid mass, three, pool according to described variation relation, and calculate the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves.Concrete:
Gas district is positioned at the reservoir of more than gas-water interface corresponding to gas storage threshold pression, and the gas storage operation phase is in gas zone state always; Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with initial reservoir pressure during gas storage reconstruction
ab, calculate the clean water influx rate W in gas district
1=W
ab-W
min;
According to the clean water influx rate W in gas district
1calculate the volume of voids V that described gas district contributes gas reservoir protection reserves
1=W
1/ (1-S
wc1-S
gr1);
The reservoir of air water interactive areas between the gas-water interface that gas storage threshold pression is corresponding with threshold pression, gas storage fills Qi Shiweiqi district, gas production latter stage is pool; Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with gas storage pressure upper limit
max, calculate the clean water influx rate W in air water interactive areas
2=W
max-W
min;
According to the described clean water influx rate W in air water interactive areas
2calculate the volume of voids V that air water interactive areas is contributed described gas reservoir protection reserves
2=W
2/ (1-S
wc2-S
gr2);
Pool is positioned at the reservoir of below gas-water interface corresponding to gas storage pressure upper limit, and the gas storage operation phase is in water logging state always; The clean water influx rate W in pool
3equal the clean water influx rate W that gas storage pressure upper limit is corresponding
max;
According to the clean water influx rate W in pool
3calculate the volume of voids V that described pool is contributed described gas reservoir protection reserves
3=W
3/ (1-S
wc3-S
gr3);
Wherein, S
wc1, S
wc2and S
wc3be respectively the constraint art saturation degree in gas district, air water interactive areas and pool, S
gr1, S
gr2and S
gr3be respectively the residual gas saturation degree that gas district, air water interactive areas and pool produce because of water enchroachment (invasion).
Volume less module 33, for deducting the volume of voids that can not be used for gas storage in each gas storage fluid mass according to each gas storage fluid mass to the volume of voids correspondence that described gas reservoir protection reserves are contributed.Concrete:
According to formula Δ V
1=(S
wc1n-S
wc1+ s
gr1n) V
1obtain the volume of voids Δ V that can not be used for gas storage in gas district
1;
According to formula Δ V
2=(S
wc2n-S
wc2+ S
gr2n) V
2obtain the volume of voids Δ V that can not be used for gas storage in air water interactive areas
2;
According to formula Δ V
3=(1-S
wc3) V
3obtain the volume of voids Δ V that can not be used for gas storage in pool
3;
Wherein, S
wc1n, S
wc2nand S
wc3nbe respectively the constraint art saturation degree in gas storage stable operation Shi Qi district, air water interactive areas and pool.
Storage capacity computing module 34, for for the volume of voids basis of gas storage, not calculating the storage capacity of described gas storage in deduction each gas storage fluid mass described.Concrete:
According to formula V
v=V-Δ V
1-Δ V
2-Δ V
3obtain the volume of voids V that gas storage is used for gas storage
v;
According to formula G
g=V
v/ B
gthe storage capacity G obtained
g;
Wherein, B
gfor the volume factor of rock gas when virgin pressure.
In the embodiment of the present invention, above-mentioned S
wc1, S
wc2and S
wc3, S
gr1, S
gr2and S
gr3, and S
wc1n, S
wc2nand S
wc3nmode by said method embodiment obtains, and repeats no more secondary.
As can be seen here, the embodiment of the present invention is when calculating storage capacity, as prior art, directly do not get the numerical value of dynamic holdup, but the volume of voids occupied by dynamic holdup is divided into gas district, air water interactive areas and these three gas storage fluid masses, pool, the volume of voids of gas storage gas storage can not be used for after deducting the dynamic holdup gas storage reconstruction of each gas storage fluid mass respectively, therefore, the result of calculation accuracy of the embodiment of the present invention increases substantially, and along with the enhancing of Gas Reservoir Water ability of immigrants, the computational accuracy of the embodiment of the present invention can improve further, technical advantage highlights, thus can be gas storage early stage evaluate storage capacity technical parameter is accurately provided.
Those skilled in the art can also recognize that various illustrative components, blocks, unit and step that the embodiment of the present invention is listed can be realized by hardware, software or both combinations.So to being realized the designing requirement depending on specific application and whole system by hardware or software.Those skilled in the art for often kind of specifically application, can use the function described in the realization of various method, but this realization can should not be understood to the scope exceeding embodiment of the present invention protection.
Various illustrative logical block described in the embodiment of the present invention, or unit can pass through general processor, digital signal processor, special IC (ASIC), field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the design of above-mentioned any combination realizes or operates described function.General processor can be microprocessor, and alternatively, this general processor also can be any traditional processor, controller, microcontroller or state machine.Processor also can be realized by the combination of calculation element, such as digital signal processor and microprocessor, multi-microprocessor, and a Digital Signal Processor Core combined by one or more microprocessor, or other similar configuration any realizes.
The software module that method described in the embodiment of the present invention or the step of algorithm directly can embed hardware, processor performs or the combination of both.Software module can be stored in the storage medium of other arbitrary form in RAM storer, flash memory, ROM storer, eprom memory, eeprom memory, register, hard disk, moveable magnetic disc, CD-ROM or this area.Exemplarily, storage medium can be connected with processor, with make processor can from storage medium reading information, and write information can be deposited to storage medium.Alternatively, storage medium can also be integrated in processor.Processor and storage medium can be arranged in ASIC, and ASIC can be arranged in user terminal.Alternatively, processor and storage medium also can be arranged in the different parts in user terminal.
In one or more exemplary design, the above-mentioned functions described by the embodiment of the present invention can realize in the combination in any of hardware, software, firmware or this three.If realized in software, these functions can store on the medium with computer-readable, or are transmitted on the medium of computer-readable with one or more instruction or code form.Computer readable medium comprises computer storage medium and is convenient to make to allow computer program transfer to the telecommunication media in other place from a place.Storage medium can be that any general or special computer can the useable medium of access.Such as, such computer readable media can include but not limited to RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage device, or other anyly may be used for carrying or store the medium that can be read the program code of form with instruction or data structure and other by general or special computer or general or special processor.In addition, any connection can be properly termed computer readable medium, such as, if software is by a concentric cable, fiber optic cables, twisted-pair feeder, Digital Subscriber Line (DSL) or being also comprised in defined computer readable medium with wireless way for transmittings such as such as infrared, wireless and microwaves from a web-site, server or other remote resource.Described video disc (disk) and disk (disc) comprise Zip disk, radium-shine dish, CD, DVD, floppy disk and Blu-ray Disc, and disk is usually with magnetic duplication data, and video disc carries out optical reproduction data with laser usually.Above-mentioned combination also can be included in computer readable medium.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. obtain a method for the storage capacity of the gas storage reconstructed by watered-out gas reservoir, it is characterized in that, comprise the following steps:
The variation relation that the gas-water interface obtaining gas storage changes with reservoir pressure;
According to described variation relation, the volume of voids that the gas reservoir protection reserves of described gas storage occupy is divided into gas district, air water interactive areas and gas storage fluid mass, three, pool, and calculates the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves;
According to each gas storage fluid mass, the volume of voids that can not be used for gas storage in each gas storage fluid mass is deducted to the volume of voids correspondence that described gas reservoir protection reserves are contributed;
For the volume of voids basis of gas storage, the storage capacity of described gas storage can not be calculated in deduction each gas storage fluid mass described.
2. the acquisition according to claim 1 method of the storage capacity of gas storage of being reconstructed by watered-out gas reservoir, is characterized in that, the variation relation that the gas-water interface of described acquisition gas storage changes with reservoir pressure, comprising:
The clean water influx rate of gas-water interface and the relation of reservoir pressure is obtained according to formula W=f (P);
According to formula V=G × B
gobtain the volume of voids V that the dynamic holdup of gas storage is corresponding;
Wherein, W is clean water influx rate corresponding to pressure P, the funtcional relationship that f (P) meets for clean water influx rate and reservoir pressure, and G is gas reservoir protection reserves, B
gfor the volume factor of rock gas when virgin pressure.
3. the acquisition according to claim 2 method of the storage capacity of gas storage of being reconstructed by watered-out gas reservoir, it is characterized in that, describedly according to described variation relation, the volume of voids that the gas reservoir protection reserves of described gas storage occupy is divided into gas district, air water interactive areas and gas storage fluid mass, three, pool, and calculate the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves, comprising:
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with initial reservoir pressure during gas storage reconstruction
ab, calculate the clean water influx rate W in gas district
1=W
ab-W
min;
According to the described clean water influx rate W in gas district
1calculate the volume of voids V that described gas district contributes described gas reservoir protection reserves
1=W
1/ (1-S
wc1-S
gr1);
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with gas storage pressure upper limit
max, calculate the clean water influx rate W in air water interactive areas
2=W
max-W
min;
According to the described clean water influx rate W in air water interactive areas
2calculate the volume of voids V that described air water interactive areas is contributed described gas reservoir protection reserves
2=W
2/ (1-S
wc2-S
gr2);
The clean water influx rate W in pool
3equal the clean water influx rate W that gas storage pressure upper limit is corresponding
max;
According to the clean water influx rate W in pool
3calculate the volume of voids V that described pool is contributed described gas reservoir protection reserves
3=W
3/ (1-S
wc3-S
gr3);
Wherein, S
wc1, S
wc2and S
wc3be respectively the constraint art saturation degree in gas district, air water interactive areas and pool, S
gr1, S
gr2and S
gr3be respectively the residual gas saturation degree that gas district, air water interactive areas and pool produce because of water enchroachment (invasion).
4. the acquisition according to claim 3 method of the storage capacity of gas storage of being reconstructed by watered-out gas reservoir, it is characterized in that, the volume of voids of gas storage can not be used in described each gas storage fluid mass of volume of voids correspondence deduction of described gas reservoir protection reserves being contributed according to each gas storage fluid mass, comprise:
According to formula Δ V
1=(S
wc1n-S
wc1+
sgr1n) V
1obtain the volume of voids Δ V that can not be used for gas storage in gas district
1;
According to formula Δ V
2=(S
wc2n-S
wc2+ S
gr2n) V
2obtain the volume of voids Δ V that can not be used for gas storage in air water interactive areas
2;
According to formula Δ V
3=(1-S
wc3) V
3obtain the volume of voids Δ V that can not be used for gas storage in pool
3;
Wherein, S
wc1n, S
wc2nand S
wc3nbe respectively the constraint art saturation degree in gas storage stable operation Shi Qi district, air water interactive areas and pool.
5. the acquisition according to claim 4 method of the storage capacity of gas storage of being reconstructed by watered-out gas reservoir, is characterized in that, described S
wc1, S
wc2and S
wc3, S
gr1, S
gr2and S
gr3, and S
wc1n, S
wc2nand S
wc3nobtain in the following manner:
Design corresponding gas storage Seepage Experiment respectively according to the feature of each gas storage fluid mass, and recorded the constraint art saturation degree S of each gas storage fluid mass by described gas storage Seepage Experiment
wc1, S
wc2and S
wc3, residual gas saturation degree S
gr1, S
gr2and S
gr3, and constraint art saturation degree S during gas storage stable operation
wc1n, S
wc2nand S
wc3n.
6. the acquisition according to claim 5 method of the storage capacity of gas storage of being reconstructed by watered-out gas reservoir, it is characterized in that, describedly for the volume of voids basis of gas storage, the storage capacity of described gas storage can not to be calculated, comprising in deduction each gas storage fluid mass described:
According to formula V
v=V-Δ V
1-Δ V
2-Δ V
3obtain the volume of voids V that gas storage is used for gas storage
v;
According to formula G
g=V
v/ B
gthe storage capacity G obtained
g;
Wherein, B
gfor the volume factor of rock gas when virgin pressure.
7. obtain a device for the storage capacity of the gas storage reconstructed by watered-out gas reservoir, it is characterized in that, comprising:
Variation relation acquisition module, the variation relation that the gas-water interface for obtaining gas storage changes with reservoir pressure;
Volume of voids divides module, for the volume of voids that the gas reservoir protection reserves of described gas storage occupy being divided into gas district, air water interactive areas and gas storage fluid mass, three, pool according to described variation relation, and calculate the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves;
Volume less module, for deducting the volume of voids that can not be used for gas storage in each gas storage fluid mass according to each gas storage fluid mass to the volume of voids correspondence that described gas reservoir protection reserves are contributed;
Storage capacity computing module, for for the volume of voids basis of gas storage, not calculating the storage capacity of described gas storage in deduction each gas storage fluid mass described.
8. the device of the storage capacity of gas storage reconstructed by watered-out gas reservoir of acquisition according to claim 7, is characterized in that, the variation relation that the gas-water interface of described acquisition gas storage changes with reservoir pressure, comprising:
The clean water influx rate of gas-water interface and the relation of reservoir pressure is obtained according to formula W=f (P);
According to formula V=G × B
gobtain the volume of voids V that the dynamic holdup of gas storage is corresponding;
Wherein, W is clean water influx rate corresponding to pressure P, the funtcional relationship that f (P) meets for clean water influx rate and reservoir pressure, and G is gas reservoir protection reserves, B
gfor the volume factor of rock gas when virgin pressure.
9. the device of the storage capacity of gas storage reconstructed by watered-out gas reservoir of acquisition according to claim 8, it is characterized in that, describedly according to described variation relation, the volume of voids that the gas reservoir protection reserves of described gas storage occupy is divided into gas district, air water interactive areas and gas storage fluid mass, three, pool, and calculate the volume of voids each gas storage fluid mass contributed by described gas reservoir protection reserves, comprising:
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with initial reservoir pressure during gas storage reconstruction
ab, calculate the clean water influx rate W in gas district
1=W
ab-W
min;
According to the described clean water influx rate W in gas district
1calculate the volume of voids V that described gas district contributes described gas reservoir protection reserves
1=W
1/ (1-S
wc1-S
gr1);
Utilize the clean water influx rate W that gas storage threshold pression is corresponding
minthe clean water influx rate W corresponding with gas storage pressure upper limit
max, calculate the clean water influx rate W in air water interactive areas
2=W
max-W
min;
According to the described clean water influx rate W in air water interactive areas
2calculate the volume of voids V that described air water interactive areas is contributed described gas reservoir protection reserves
2=W
2/ (1-S
wc2-S
gr2);
The clean water influx rate W in pool
3equal the clean water influx rate W that gas storage pressure upper limit is corresponding
max;
According to the clean water influx rate W in pool
3calculate the volume of voids V that described pool is contributed described gas reservoir protection reserves
3=W
3/ (1-S
wc3-S
gr3);
Wherein, S
wc1, S
wc2and S
wc3be respectively the constraint art saturation degree in gas district, air water interactive areas and pool, S
gr1, S
gr2and S
gr3be respectively the residual gas saturation degree that gas district, air water interactive areas and pool produce because of water enchroachment (invasion).
10. the device of the storage capacity of gas storage reconstructed by watered-out gas reservoir of acquisition according to claim 9, it is characterized in that, the volume of voids of gas storage can not be used in described each gas storage fluid mass of volume of voids correspondence deduction of described gas reservoir protection reserves being contributed according to each gas storage fluid mass, comprise:
According to formula Δ V
1=(S
wc1n-S
wc1+
sgr1n) V
1obtain the volume of voids Δ V that can not be used for gas storage in gas district
1;
According to formula Δ V
2=(S
wc2n-S
wc2+ S
gr2n) V
2obtain the volume of voids Δ V that can not be used for gas storage in air water interactive areas
2;
According to formula Δ V
3=(1-S
wc3) V
3obtain the volume of voids Δ V that can not be used for gas storage in pool
3;
Wherein, S
wc1n, S
wc2nand S
wc3nbe respectively the constraint art saturation degree in gas storage stable operation Shi Qi district, air water interactive areas and pool.
The device of the storage capacity of the gas storage that 11. acquisitions according to claim 10 are reconstructed by watered-out gas reservoir, is characterized in that, described S
wc1, S
wc2and S
wc3, S
gr1, S
gr2and S
gr3, and S
wc1n, S
wc2nand S
wc3nobtain in the following manner:
Design corresponding gas storage Seepage Experiment respectively according to the feature of each gas storage fluid mass, and recorded the constraint art saturation degree S of each gas storage fluid mass by described gas storage Seepage Experiment
wc1, S
wc2and S
wc3, residual gas saturation degree S
gr1, S
gr2and S
gr3, and constraint art saturation degree S during gas storage stable operation
wc1n, S
wc2nand S
wc3n.
The device of the storage capacity of the gas storage that 12. acquisitions according to claim 11 are reconstructed by watered-out gas reservoir, it is characterized in that, describedly for the volume of voids basis of gas storage, the storage capacity of described gas storage can not to be calculated, comprising in deduction each gas storage fluid mass described:
According to formula V
v=V-Δ V
1-Δ V
2-Δ V
3obtain the volume of voids V that gas storage is used for gas storage
v;
According to formula G
g=V
v/ B
gthe storage capacity G obtained
g;
Wherein, B
gfor the volume factor of rock gas when virgin pressure.
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