CN110778312B - Model for simulating gas reservoir edge and bottom water invasion and method for calculating water invasion coefficient - Google Patents
Model for simulating gas reservoir edge and bottom water invasion and method for calculating water invasion coefficient Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 144
- 230000009545 invasion Effects 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000011435 rock Substances 0.000 claims abstract description 47
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 238000002474 experimental method Methods 0.000 claims description 18
- 230000001186 cumulative effect Effects 0.000 claims description 9
- 238000011161 development Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000011148 porous material Substances 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010926 purge Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 47
- 238000004088 simulation Methods 0.000 description 8
- 230000035699 permeability Effects 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
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- 230000002093 peripheral effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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Abstract
A model for simulating water intrusion at the bottom of a gas reservoir and a method for calculating a water intrusion coefficient are disclosed. The method mainly solves the problems that the flow speed and the distribution of injected water of a simulated edge-bottom water gas reservoir model in a laboratory can be different, and the rock size is fixed and the sealing requirement is high. The model consists of a flat rock core, an upper cover plate, a lower groove and a telescopic fulcrum; surrounding the periphery and the bottom of the flat rock core by adopting a high-permeability rock core, and simulating the invasion of water at the bottom of the edge of a real stratum; the upper cover plate is provided with a plurality of groups of air outlets which are in contact with the rock core and sealed by using rubber; telescopic supporting points are arranged at the periphery and the bottom of the lower groove to assist the upper cover plate to meet the sealing property and simultaneously be suitable for simulating reservoir layers with different edge shapes; the side surface of the telescopic fulcrum is provided with a water outlet hole, the telescopic fulcrum is connected with a high-pressure pump set through a pipeline, and the high-pressure pump set is used for keeping the pressure constant to simulate infinite stratum water bodies or reducing the pressure to simulate limited stratum water bodies.
Description
The technical field is as follows:
the invention relates to a novel model for simulating gas reservoir edge bottom water invasion and a method for calculating a water invasion coefficient, which are applied to the field of petroleum engineering.
Background art:
in the development process of the gas reservoir with active edge bottom water, the production of the gas field is directly influenced by the edge bottom water invasion, so that the water content of a gas well rises quickly, the recovery ratio is reduced, and the efficient development of the gas reservoir is restricted, so that the edge bottom water invasion mechanism is deeply researched, a method for researching the edge bottom water invasion development process of the gas reservoir is found, the water invasion coefficient is obtained, and the method has important significance for guiding the production of the gas reservoir. At present, a water injection well or a device side hole distribution simulation side water drive is arranged at the edge of a rock core for simulation of a gas reservoir side and bottom water invasion model in a laboratory. The method is influenced by the heterogeneity of the rock core, the flow speed and the distribution of the injected water are different, the size of the rock is fixed, the sealing requirement is high, and the simulation is not real.
The invention content is as follows:
in order to solve the technical problems mentioned in the background technology, the invention provides a new model for simulating the invasion of bottom water of a gas reservoir and a method for calculating a water invasion coefficient.
The technical scheme of the invention is as follows: the model comprises a flat rock core, an upper cover plate, a lower groove and a telescopic fulcrum.
The length and the width of the flat rock core are 20cm, the height of the flat rock core is 15cm, and the periphery and the bottom of the flat rock core are surrounded by a high-permeability rock core; the flat rock core is placed in 1 upper cover plate and 1 lower groove, wherein the length and width of the upper cover plate are 39cm, the height of the upper cover plate is 2cm, the length and width of the lower groove are 39cm, the height of the lower groove is 27cm, and the wall thickness of the lower groove is 2 cm; 4 high-permeability cores on the side surfaces are 25cm long, 5cm wide and 15cm high, and 1 high-permeability core on the bottom is 30cm long, 5cm wide and 5cm high; the upper plate is provided with 4 first threaded connectors, the gas production connector is connected to the first threaded connectors, and the lower end of the gas production connector is in contact with the upper end of the flat rock core, so that the gas production development process is realized; 10 second screwed interfaces are formed in the front of the lower groove, the telescopic supporting point is split into a main body and a water inlet joint, the main body is placed inside the lower groove, and the water inlet joint is placed outside the lower groove and is in rotary connection with the corresponding second screwed interfaces in an aligning mode for fixing the core. The artificial rock core is sealed by the upper cover plate and the lower groove, the screws penetrate through the upper clamping plate threaded interface and the lower clamping plate threaded interface of the upper clamping plate and the lower clamping plate, and the upper cover plate and the lower groove are fixed by the aid of the nuts to realize pressurization sealing.
The method for solving the water invasion coefficient by using the model comprises the following steps:
firstly, assembling a model, wherein a gap of 5cm is reserved between the assembled core and a lower groove, and water in the gap is used for eliminating the difference of the flowing speed and the distribution of the water when a water injection well is arranged at the edge or holes are distributed on the side surface of the device for water injection;
secondly, sealing the rock core in the model, and connecting pipelines according to a predetermined wiring diagram, wherein each group of pipelines is connected with a telescopic fulcrum on one side surface of the model; after connection, the shunting box is connected with the balance bottle through a first connecting pipeline, the injection gas tank is connected with the balance bottle through a second connecting pipeline, the advection pump is connected with the balance bottle through a third connecting pipeline, a fourth connecting pipeline is connected with the upper end and the lower end of the balance bottle, and the metering bottle is connected with the gas production connector through a fifth connecting pipeline to form a set of experiment system;
thirdly, opening a valve, connecting the model into a vacuum system, vacuumizing the core by using a vacuum pump, saturating the core with water after vacuumizing, and measuring the pore volume and porosity of the core according to the saturated water of the core;
fourthly, using N for the water in the rock core treated in the third step 2 Purging and then measuring the original water saturation S wi Water saturation at rest of experiment S w Cumulative water production W p And the original volume coefficient B of the gas under the experimental conditions gi Volume of waterCoefficient B w Closing the valve, discharging all gas which does not enter the rock core, injecting water into the gap through the water injection channel, and simulating the invasion of bottom water after the air inlet channel is converted into the water injection channel;
fifthly, recording accumulated water yield, pressure and time, and recording pressure difference delta p and time t until the experimental pressure is stable and unchanged; calculating geological reserve G by using the core porosity phi measured in the third step, and simultaneously using the original water saturation S measured in the fourth step wi Water saturation S at the time of experiment stop w And the cumulative water yield W p And the original volume coefficient B of the gas under the experimental conditions gi Volume coefficient of water B w Calculating water invasion W e ；
Sixthly, calculating a water invasion coefficient B for simulating the invasion of water at the bottom of the gas reservoir by using the model according to a formula (1) and a formula (2) by combining the pressure difference delta p and the time t recorded in the fifth step;
W e ＝W p B w +GB gi (S w -S wi ) Formula (1)
B＝W e /(. DELTA.p.t) formula (2)
The flat artificial rock core is manufactured into different types of rock cores according to the conditions of the aspects of the heterogeneity, permeability, porosity, sensitivity, interlayer and the like of an actual gas reservoir so as to meet the requirement of simulating the actual gas reservoir.
The invention has the following beneficial effects: the model provided by the invention has the advantages of simple structure and convenience in operation, solves the difference of flow speed and distribution of injected water, and solves the problem of high sealing requirement. In laboratory research, a simulation method for a gas reservoir edge bottom water invasion model is a method for arranging a water injection well at the edge of a rock core or arranging holes on the side surface of a device to simulate edge water drive. The method is influenced by the heterogeneity of the rock core, the flow speed and the distribution of the injected water are different, the size of the rock is fixed, the sealing requirement is high, and the simulation is not real.
Description of the drawings:
FIG. 1 is a schematic view of the structure of the upper cover plate after being assembled with the air outlet
FIG. 2 is a schematic view showing the structure of the assembled lower groove and iron plate
FIG. 3 is a schematic diagram of a structure of a flat core after being assembled with a hypertonic core
FIG. 4 is a schematic view of the assembled telescopic support
FIG. 5 is a schematic view of a screw
FIG. 6 is a schematic view of an upper clamping plate
FIG. 7 is a schematic view of an upper clamping plate
FIG. 8 is a schematic view of a nut
FIG. 9 is a fully assembled schematic view
FIG. 10 is a cross-sectional view of the core
FIG. 11 is a cross-sectional view of the upper cover plate
FIG. 12 is a cross-sectional view of a lower groove
FIG. 13 is a cross-sectional view of the telescoping fulcrum
FIG. 14 is a cross-sectional view of the upper and lower clamping plates
FIG. 15 is a cross-sectional view of a screw
FIG. 16 is a cross-sectional view of the nut
FIG. 17 is a sectional view of the edge bottom water device after assembly
FIG. 18 is a drawing of the whole experimental apparatus
FIG. 19 plot of cumulative water production volume in the laboratory
FIG. 20 is a graph showing the change in pressure inside the core
In the figure, 1-an upper cover plate, 2-a gas production joint, 3-a first threaded joint, 4-rubber, 5-a lateral high permeability core, 6-a flat core, 7-a bottom high permeability core, 8-a telescopic fulcrum, 9-a lower groove, 10-a water inlet joint, 11-a scale mark, 12-a resistance line, 13-a water outlet, 14-a water injection channel, 15-a thread line, 16-a flat flow pump, 17-a balance bottle, 18-an injection gas tank, 19-a diversion box, 20-a metering bottle, 21-a valve, 22-a second threaded joint, 23-rubber, 24-a pipeline combination, 25-a pipeline combination, 26-a pipeline combination, 27-an IV pipeline combination and 28-a pipeline combination, 29-fourth connecting line, 30-first connecting line, 31-second connecting line, 32-third connecting line, 33-fifth connecting line, 34-screw, 35-upper clamping plate, 36-upper clamping plate nipple, 37-lower clamping plate, 38-lower clamping plate nipple, 39-nut.
Detailed Description
The invention is further explained by taking the calculation of the water invasion factor as a specific example with the accompanying drawings:
as shown in fig. 1 to 18, the model comprises a flat core 6, an upper cover plate 1, a lower groove 9 and an extensible fulcrum 8. The flat rock core 6 is 20cm long and wide and 15cm high, and is surrounded by a side high-permeability rock core 5 and a bottom high-permeability rock core 7 at the periphery and the bottom;
the flat rock core 6 is placed in 1 upper cover plate 1 and 1 lower groove 9, wherein the length and width of the upper cover plate 1 are 39cm, the height is 2cm, the length and width of the lower groove 9 are 39cm, the height is 27cm, and the wall thickness is 2 cm. The length and width of 4 high-permeability cores 5 are 25cm, 5cm and 15cm, and the length and width of 1 bottom high-permeability core 7 are 30cm and 5 cm. The upper cover plate 1 is deployed with reference to fig. 1, 4 first threaded connectors 3 are arranged, the gas production connector 2 is connected to the first threaded connectors 3, and the lower end of the gas production connector 2 is in contact with the upper end of the flat rock core 6, so that the gas production development process is achieved. The lower groove 9 is arranged according to fig. 2, 10 second threaded connectors 22 are formed in the front of the lower groove, the main body is arranged inside the lower groove 9 by splitting the telescopic supporting point into a main body (the main body comprises scale marks 11, resistance lines 12, a water outlet 13, a water injection channel and rubber 23) and the water inlet connector 10, and the water inlet connector 10 is arranged outside the lower groove and is in rotary connection after being aligned with the corresponding second threaded connectors 22 to fix the rock core. The artificial rock core is sealed by the upper cover plate 1 and the lower groove 9, and finally the screw 34 penetrates through the threaded interfaces of the upper clamping plate 35 and the lower clamping plate 37 and is matched with a nut to fix the upper cover plate 1 and the lower groove 9, so that pressure sealing is realized.
The water invasion coefficient is obtained in a laboratory by utilizing the model, and the method comprises the following steps:
firstly, after the core and the lower groove 9 of the model are assembled, a gap of 5cm is reserved, and the water in the gap can eliminate the difference of the flowing speed and the distribution of the water when a water injection well is arranged at the edge or holes are distributed on the side surface of the device for water injection.
Second, the core is sealed and the lines are connected as shown in fig. 18. I, II, III, IV pipeline combination respectively has 2 pipelines, the retractable fulcrum of a side of every group pipeline connection model, V pipeline combination has 4 pipeline connection model bottom retractable fulcrums, the reposition of redundant personnel box passes through first connecting line 30 and connects balanced bottle 17, it is connected with balanced bottle 17 through second connecting line 31 to pour into gas pitcher 18 into, advection pump 16 is connected with balanced bottle 17 through third connecting line 32, fourth connecting line 29 connects balanced bottle 17 upper and lower both ends, metering bottle 20 is connected through fifth connecting line 33 and gas production and connects 2 and constitute one set of experimental system. And opening a valve 21, connecting the model into a vacuum system, vacuumizing the core by using a vacuum pump, saturating the core with water after vacuumizing, and measuring the pore volume and the porosity of the core according to the saturated water amount of the core.
Thirdly, using N for water in the core 2 After the clean-up and saturated gas are used for measuring the original water saturation, the valve 21 is closed to discharge all gas which does not enter the core, water is injected into the gap through the water injection channel 14, and the simulation edge bottom water invasion experiment formally starts after the air inlet channel is changed into the water injection channel. And recording the accumulated water yield, pressure and time until the experimental pressure is stable and unchanged. Calculating geological reserve G by using the core porosity phi measured in the second experiment step, and simultaneously using the original water saturation S measured in the third experiment step wi Water saturation S at the time of experiment stop w Cumulative water production W p And the original volume coefficient B of the gas under the experimental conditions gi Volume coefficient of water B w Calculating water invasion W e . And finally, calculating a water invasion coefficient B for simulating the invasion of water at the bottom of the gas reservoir by using the model by combining the pressure difference delta p and the time t recorded in the third experiment.
First, experimental conditions
(1) Temperature: at 60 deg.C.
(2) Gas: n is a radical of hydrogen 2 。
(3) Core: artificial homogeneous cores, 30cm by 20cm, the core data are shown in Table 1.
TABLE 1 Artificial core data
Second, experimental facilities
The device comprises an upper cover plate, a lower groove, a gas production joint, a water inlet joint, rubber, a flat rock core, a telescopic fulcrum, a screw, an upper clamping plate, a lower clamping plate, a nut, a advection pump, a balance bottle, an injection gas tank, a flow distribution box, a pipeline, a valve, a metering bottle, a thermostat, a pressure gauge, a pressure sensor and the like.
Third, equipment connection
1. The flat rock core is placed in 1 upper cover plate and 1 lower groove, wherein the length and width of the upper cover plate are 39cm, the height is 2cm, the length and width of the lower groove are 39cm, the height is 27cm, and the wall thickness is 2 cm. The length, width and height of the 4 side high permeability cores are 25cm, 5cm and 15cm, and the length, width and height of the 1 bottom high permeability core are 30cm and 5 cm. The upper plate is deployed according to the reference of fig. 1, 4 threaded connectors are arranged, the gas production connector is connected to the threaded connectors, and the lower end of the gas production connector is in contact with the upper end of the flat rock core, so that the gas production development process is realized. The lower groove is arranged according to the reference of fig. 2, 10 threaded connectors are arranged in the front, the main body part is placed inside the lower groove through splitting the telescopic supporting point into the main body and the water inlet connector, the water inlet connector is placed outside the lower groove and is connected in a rotating mode after being aligned with the threaded connectors, and the main body part is used for fixing the core. The lines are connected as per fig. 18. I, II, III, IV pipeline combination respectively have 2 pipelines, the retractable fulcrum of a side of every group pipeline connection model, V pipeline combination has 4 pipeline connection model bottom retractable fulcrums, connecting line connection shunting box water inlet, it passes through connecting line and is connected with balanced bottle to pour into the gas pitcher into, the advection pump passes through connecting line and is connected with balanced bottle, both ends about connecting line connection balanced bottle, the measuring flask passes through connecting line and the joint connection of adopting the gas constitutes one set of experimental system.
Fourth, principle of experiment
The simulation content is the development process of water invasion at the bottom of a certain gas reservoir in China, the thickness of the reservoir is 500m, and the planar scaling ratio is 1: 10000. The space distance between the model and the core hole is determined by the telescopic length of the telescopic fulcrum and the size of the core. The experimental core is divided into 30X 20 grids, the number of the grids of the low-permeability core is 20X 15, the lengths of X, Y and the Z direction are both 1cm, and the rest grids are high-permeability core grids. The peripheral hypertonic core is used for simulating the microscopic inflow state of the bottom edge water invasion under the formation condition as truly as possible.
And calculating the water invasion amount and the water invasion coefficient by using the measured data, wherein the formula is as follows:
W e ＝W p B w +GB gi (S w -S wi ) (1)
B＝W e /(Δp·t) (2)
fifth, processing experimental data
The cumulative water yield volume at 20 deg.C under 1 standard atmosphere is measured at 810min for the experiment, as shown in Table 2, the curve is shown in FIG. 20, and the cumulative water yield is 3.9562 × 10 -9 m 3 (ii) a Measuring the original volume coefficient B of gas measured under laboratory conditions gi 0.004, volume coefficient of water B w Original water saturation S ═ 1.01 wi Water saturation S ═ 0.32 w 0.61259 and original reserve G0.125 m 3 Calculated by substituting equation (1) to obtain W0.00015 m 3 e
TABLE 2 laboratory cumulative water production volume
The curve of fig. 19 is divided into three stages, which can be seen from the straight trend of the curve of the first stage, and only the bound water around the shaft can not flow into the bottom of the well at the moment; in the second stage, the bottom of the well gradually sees water along with the time; in the third stage, the accumulated water production curve is obviously upwarped because water forms a dominant channel in the rock pore channel.
The experiment adopts limited large-edge bottom water as a condition, the change of the internal pressure of the rock core measured in the experiment is shown in table 3, the curve is shown in figure 20, and the differential pressure is 9.82 MPa; the water invasion coefficient of 0.00 is calculated by substituting the pressure difference delta P of 9.82MPa and the time t of 0.5625day measured in the laboratory into the formula (2)00265m 3 /(day·MPa)。
TABLE 3 core internal pressure Change data
As shown by the curve of fig. 20, when the experiment is carried out for 13h (780min), the internal pressure of the core tends to be stable and unchanged, and the curves of the accumulated water yield and the accumulated gas yield reach the maximum value, which indicates that the bottom water energy is used up, and the simulation of the bottom water invasion experiment by using the limited water model is finished.
Sixthly, analysis of experimental results
The model is used for simulating the edge and bottom water invasion experiment of a certain gas reservoir in China, and the water invasion coefficient calculated by the obtained experimental data is 0.0000265m 3 /(day. MPa). The water invasion coefficient of the gas reservoir site is 4.7 multiplied by 10 5 m 3 /(day. MPa). Dividing the experimental calculation result and the field data calculation result by the volume of each gas reservoir, and unifying the unit as m 3 /(day·MPa·cm 3 ) The error value is 7.75%, and the problem of low water invasion coefficient caused by difference of flow speed and distribution of injected water is solved.
Claims (2)
1. A model for simulating the invasion of water at the bottom of a gas reservoir comprises a flat rock core (6), an upper cover plate (1), a lower groove (9) and a telescopic fulcrum (8);
the flat rock core (6) is 20cm long and wide, 15cm high, and is surrounded by a side high-permeability rock core (5) and a bottom high-permeability rock core (7) at the periphery and the bottom;
the flat rock core (6) is placed in 1 upper cover plate (1) and 1 lower groove (9), wherein the length and width of the upper cover plate (1) are 39cm, the height of the upper cover plate is 2cm, the length and width of the lower groove (9) are 39cm, the height of the lower groove is 27cm, and the wall thickness of the lower groove is 2 cm; the length and the width of 4 high-permeability cores (5) on the side surface are 25cm, 5cm and 15cm, and the length and the width of 1 high-permeability core (7) on the bottom are 30cm and 5 cm; the upper cover plate (1) is provided with 4 first threaded connectors (3), the gas production connector (2) is connected to the first threaded connectors (3), and the lower end of the gas production connector (2) is in contact with the upper end of the flat rock core (6), so that the gas production development process is realized; the front of the lower groove (9) is provided with 10 second threaded connectors (22), the telescopic fulcrum is split into a main body and a water inlet connector (10), the main body is placed inside the lower groove (9), the water inlet connector (10) is placed outside the lower groove (10), and the main body and the water inlet connector are aligned to the corresponding second threaded connectors (22) and then are connected in a rotating mode to fix the rock core; the artificial rock core is sealed by the upper cover plate (1) and the lower groove (9), the screw (34) penetrates through the upper clamping plate threaded interface (36) and the lower clamping plate threaded interface (38) of the upper clamping plate (35) and the lower clamping plate (37), and the upper cover plate (1) and the lower groove (9) are fixed by matching nuts to realize pressure sealing.
2. A method for determining water intrusion coefficients in a laboratory using the model of claim 1, the method comprising the steps of:
firstly, assembling the model as claimed in claim 1, wherein a gap of 5cm is reserved between the assembled core and the lower groove (9), and water in the gap is used for eliminating the difference of the flow speed and the distribution of water when a water injection well is arranged at the edge or holes are distributed on the side surface of the device for water injection;
secondly, sealing the rock core in the model of claim 1, and connecting pipelines according to a predetermined wiring diagram, wherein each group of pipelines is connected with a telescopic fulcrum on one side surface of the model; after connection, the shunting box is connected with a balance bottle (17) through a first connecting pipeline (30), an injection gas tank (18) is connected with the balance bottle (17) through a second connecting pipeline (31), a constant-current pump (16) is connected with the balance bottle (17) through a third connecting pipeline (32), a fourth connecting pipeline (29) is connected with the upper end and the lower end of the balance bottle (17), and a metering bottle (20) is connected with a gas production connector (2) through a fifth connecting pipeline (33) to form a set of experiment system;
thirdly, opening a valve (21), connecting the model into a vacuum system, vacuumizing the core by using a vacuum pump, saturating water in the core after vacuumizing, and measuring the pore volume and the porosity of the core according to the saturated water amount of the core;
fourthly, using N for the water in the rock core treated in the third step 2 Purging, then measuring the original water saturation S wi Water saturation S at the time of experiment stop w And the cumulative water yield W p And the original volume coefficient B of the gas under the experimental conditions gi Volume coefficient of water B w Closing the valve (21), discharging all gas which does not enter the rock core, injecting water into the gap through the water injection channel (14), and simulating the invasion of bottom water after the air inlet channel is converted into the water injection channel;
fifthly, recording accumulated water yield, pressure and time, and recording pressure difference delta p and time t until the experimental pressure is stable and unchanged; calculating geological reserve G by using the core porosity phi measured in the third step, and simultaneously using the original water saturation S measured in the fourth step wi Water saturation S at the time of experiment stop w And the cumulative water yield W p And the original volume coefficient B of the gas under the experimental conditions gi Volume coefficient of water B w Calculating water invasion W e ；
Sixthly, calculating a water invasion coefficient B for simulating the invasion of water at the bottom of the gas reservoir by using the model according to a formula (1) and a formula (2) by combining the pressure difference delta p and the time t recorded in the fifth step;
W e ＝W p B w +GB gi (S w -S wi ) Formula (1)
B ═ We/(Δ p × t) formula (2).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621169A (en) * | 1994-01-18 | 1997-04-15 | Restech, Inc. | Method for determining hydrocarbon/water contact level for oil and gas wells |
| WO2013151455A1 (en) * | 2012-04-06 | 2013-10-10 | Общество С Ограниченной Ответственностью "Сплит" | Method for determining the water encroachment factor and the influx composition of an oil well |
| CN203239338U (en) * | 2013-05-11 | 2013-10-16 | 东北石油大学 | Two-dimensional artificial core model for researching edge-bottom water oil reservoir water invasion rules |
| CN103983551A (en) * | 2014-05-08 | 2014-08-13 | 西南石油大学 | Two-dimensional visual seepage experiment apparatus stimulating in-layer homogeneity, and its experiment method |
| CN106437644A (en) * | 2016-09-14 | 2017-02-22 | 中国石油大学(华东) | Large bottom water sandstone oil reservoir development physical simulation experiment device and working method thereof |
| CN107916927A (en) * | 2017-09-19 | 2018-04-17 | 中国石油天然气股份有限公司 | Gas reservoir development methods, devices and systems |
| CN108316917A (en) * | 2018-01-27 | 2018-07-24 | 东北石油大学 | A method of being built with edge-wa- ter reservoir waterflooding extraction model |
| CN108756859A (en) * | 2018-05-03 | 2018-11-06 | 中国石油天然气股份有限公司 | The analogue experiment installation and method of gas reservoir commingling production side water water-invasion mechanism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2945879B1 (en) * | 2009-05-20 | 2011-06-24 | Inst Francais Du Petrole | METHOD FOR OPERATING A POROUS MEDIUM USING MODELING FLUID FLOWS |
-
2019
- 2019-10-09 CN CN201910951716.2A patent/CN110778312B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5621169A (en) * | 1994-01-18 | 1997-04-15 | Restech, Inc. | Method for determining hydrocarbon/water contact level for oil and gas wells |
| WO2013151455A1 (en) * | 2012-04-06 | 2013-10-10 | Общество С Ограниченной Ответственностью "Сплит" | Method for determining the water encroachment factor and the influx composition of an oil well |
| CN203239338U (en) * | 2013-05-11 | 2013-10-16 | 东北石油大学 | Two-dimensional artificial core model for researching edge-bottom water oil reservoir water invasion rules |
| CN103983551A (en) * | 2014-05-08 | 2014-08-13 | 西南石油大学 | Two-dimensional visual seepage experiment apparatus stimulating in-layer homogeneity, and its experiment method |
| CN106437644A (en) * | 2016-09-14 | 2017-02-22 | 中国石油大学(华东) | Large bottom water sandstone oil reservoir development physical simulation experiment device and working method thereof |
| CN107916927A (en) * | 2017-09-19 | 2018-04-17 | 中国石油天然气股份有限公司 | Gas reservoir development methods, devices and systems |
| CN108316917A (en) * | 2018-01-27 | 2018-07-24 | 东北石油大学 | A method of being built with edge-wa- ter reservoir waterflooding extraction model |
| CN108756859A (en) * | 2018-05-03 | 2018-11-06 | 中国石油天然气股份有限公司 | The analogue experiment installation and method of gas reservoir commingling production side water water-invasion mechanism |
Non-Patent Citations (7)
| Title |
|---|
| A Practical Solution for Water Invasion Calculation for a Reservoir With Edge Water;ZHANG Jicheng,etc;《Physical and Numerical Simulation of Geotechnical Engineering》;20140101;第44-48页 * |
| An Analysis of a Volumetric Balance Equation for Calculation of Oil in Place and Water Influx;D.H. Tehrani，etc;《Society of Petroleum Engineers》;19850901;第1664-1670页 * |
| Influence of reservoir heterogeneity on water invasion differentiation in carbonate gas reservoirs;Feng Xi，etc;《Natural Gas Industry B》;20190126;第7-15页 * |
| 多井协同开发水侵规律物理模拟实验研究;方飞飞等;《实验室研究与探索》;20190531;第38卷(第5期);第42-45页 * |
| 杏北地区河口坝构型及其控剩余油物理模拟;田晓雷;《中国优秀硕士学位论文全文数据库（工程科技Ⅰ辑）》;20150215;第1-55页 * |
| 稠油热采区水侵量计算方法研究;兰金玉等;《数学的实践与认识》;20140131;第44卷(第1期);第108-117页 * |
| 裂缝水窜型气井水侵机理及优化治水实验研究;徐轩等;《2018年全国天然气学术年会论文集》;20181114;第1-9页 * |
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