CN106498920A - The method for numerical simulation of seepage flow Changing Pattern during a kind of wide open digging of oil storage - Google Patents
The method for numerical simulation of seepage flow Changing Pattern during a kind of wide open digging of oil storage Download PDFInfo
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- CN106498920A CN106498920A CN201610946304.6A CN201610946304A CN106498920A CN 106498920 A CN106498920 A CN 106498920A CN 201610946304 A CN201610946304 A CN 201610946304A CN 106498920 A CN106498920 A CN 106498920A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
- G06T17/05—Geographic models
Abstract
The present invention relates to during a kind of wide open digging of oil storage seepage flow Changing Pattern method for numerical simulation, by numerical simulation software at different conditions, the numerical simulation for digging into row pore pressure wide open to oil storage, the pore pressure in oil storage hole under different condition is contrasted with steady pressure value respectively, with the data of Water tight during the wide open digging of acquisition oil storage, the seepage effect for the wide open digging of oil storage provides strong theory and technology support.
Description
Technical field
The present invention relates to underground chamber oil storage technical field, and in particular to seepage flow change rule during a kind of wide open digging of oil storage
The method for numerical simulation of rule.
Background technology
Oil concerns national economy, and the oil gas in order to ensure underground water seal is not in excessive, and water seal oil depot cavern is opening
Require in digging and running that there is strict Water tight.
Underground water seal oil storage cave depot, is exactly to excavate grotto below stable level of ground water, and hole wall not lining cutting, using hole
Subsoil water closure rock cranny around storehouse, realizes the purpose for sealing oil product up for safekeeping.It is underground that seal is kept using groundwater pressure
Water seal cave depot is capable of the key of longer-term storage oil product, and this requirement maintains the crack of adequate thickness to contain in the rock mass around oil storage hole
Water layer, i.e., so-called water seal layer.In order to keep water seal layer stable, it usually needs build water curtain system, by water curtain hole to rock mass
Water filling, to recharge ground water, it is ensured that bank water sealing condition.
Water curtain system is played an important role in the operation of underground water seal bank, and water curtain system is designed to underground water seal
The key link of cave depot engineering.Under normal circumstances, water curtain system be one comprising water curtain tunnel, level to water curtain hole and vertical to
The combined system in water curtain hole.In order to ensure the effectiveness of water seal, when water curtain system is designed, which must be considered comprehensively with oil storage hole and
Water body flow between periphery rock mass.Uneven, uncertain due to fault crevice in Engineering Zone and rock mass spatial distribution, make
The design for obtaining water curtain system becomes complicated.
Except by water curtain system, to rock mass water filling, slip casting closure is another important measures for realizing oil storage hole seal.
When the periphery rock crushing degree in oil storage hole is high, permeability is big, in bank, the probability of oil and gas leakage will be greatly increased.With
When, excessive subsoil water can flow to oil storage hole along leakage passage, bring adverse effect to engineering：1st, in the construction time, will result in
Level of ground water declines, and destroys water seal environment, affects the construction of oil storage hole.2nd, in the runtime, the workload of drawing water in oil storage hole will be increased
With the water filling workload of water curtain system, operating cost is raised.Therefore, in work progress, reply soft rock mass and leakage passage enter
Row injecting treatment, improves rock-mass quality, blocks leakage passage.
Cavern's mode is excavated using band water curtain system mostly both at home and abroad, primarily to ensureing that cavern excavation seepage will not be produced
Raw crack " cavity ", while water curtain water filling increases the seepage effect of crack rock, increases water yield, reduces Surrounding Rock Strength.Mesh
Before, under conditions of consideration crack rock, the seepage effect of cavern's stage excavation is also supported without strong theory and technology.Cause
This, needs to be simulated analysis to the numerical value of seepage flow Changing Pattern during cavern's stage excavation, and to obtain, oil storage is wide open to dig
The data of Water tight in journey.
Content of the invention
The technical problem to be solved in the present invention is, there is provided the number of seepage flow Changing Pattern during a kind of cavern's stage excavation
Value analogy method, is simulated analysis to the numerical value of seepage flow Changing Pattern during the wide open digging of oil storage, to obtain the wide open digging of oil storage
During Water tight data, the seepage effect for the wide open digging of oil storage provides strong theory and technology and supports.
The technical solution adopted for the present invention to solve the technical problems is：During providing a kind of wide open digging of oil storage, seepage flow becomes
The method for numerical simulation of law, comprises the following steps：
A1, according to Hydrogeological Analysis, determine oil storage cave depot location area groundwater type, level of ground water, and by number
Value simulation software sets up a 3-D geometric model to storehouse location area；
A2, logarithm value simulation software carry out the setting of initial condition, and oil storage hole pore pressure is simulated, to obtain
The steady pressure value of oil storage hole pore pressure under initial condition；
A3, at different conditions, the numerical simulation for digging into row pore pressure wide open to oil storage, by oil storage hole under different condition
Pore pressure contrasted with steady pressure value respectively；
A4, according to comparing result, judge whether oil storage hole meets water sealing condition：If the pore water pressure in oil storage hole is stable
Pressure value, then oil storage hole meet water sealing condition；If the pore water pressure in oil storage hole is less than steady pressure value, oil storage hole is unsatisfactory for water
Strip of paper used for sealing part.
Further, described at different conditions, the numerical simulation for digging into row pore pressure wide open to oil storage includes：
Under the conditions of without water curtain, pore pressure is carried out to oil storage hole stage excavation numerical simulation；
Under the conditions of having water curtain, pore pressure is carried out to oil storage hole stage excavation numerical simulation；
Under the conditions of crack is not considered, respectively to having, dig into the number of row pore pressure without oil storage hole standard-sized sheet under the conditions of water curtain
Value simulation；
And under the conditions of slip casting, respectively to having, dig into the numerical value of row pore pressure without oil storage hole standard-sized sheet under the conditions of water curtain
Simulation.
Further, numerical simulation bag described under the conditions of without water curtain, that pore pressure is carried out to oil storage hole stage excavation
Include following steps：
B1, simulation oil storage wide open dig ground floor when pore water pressure cloud charts, pore water pressure distribution number under the conditions of being somebody's turn to do
According to；
B2, simulation oil storage wide open dig the second layer when pore water pressure cloud charts, pore water pressure distribution number under the conditions of being somebody's turn to do
According to；
B3, simulation oil storage wide open dig third layer when pore water pressure cloud charts, obtain the distribution of pore water pressure under the conditions of this
Data.
Further, numerical simulation bag described under the conditions of having water curtain, that pore pressure is carried out to oil storage hole stage excavation
Include following steps：
C1, simulation oil storage wide open dig ground floor when pore water pressure cloud charts, pore water pressure distribution number under the conditions of being somebody's turn to do
According to；
C2, simulation oil storage wide open dig the second layer when pore water pressure cloud charts, pore water pressure distribution number under the conditions of being somebody's turn to do
According to；
C3, simulation oil storage wide open dig third layer when pore water pressure cloud charts, obtain the distribution of pore water pressure under the conditions of this
Data.
Further, described under the conditions of crack is not considered, respectively to having, dig into row without oil storage hole standard-sized sheet under the conditions of water curtain
The numerical simulation of pore pressure includes：
Simulation do not consider crack condition and without water curtain under the conditions of, oil storage hole standard-sized sheet dig pore water pressure cloud charts, obtain
The distributed data of pore water pressure under the conditions of must being somebody's turn to do, while the water yield to oil storage hole is simulated, water yield under the conditions of being somebody's turn to do
Data；
Under the conditions of not considering crack condition and having water curtain, the pore water pressure cloud charts that oil storage hole standard-sized sheet digs are obtained for simulation
The distributed data of pore water pressure under the conditions of must being somebody's turn to do, while the water yield to oil storage hole is simulated, water yield under the conditions of being somebody's turn to do
Data.
Further, the 3-D geometric model internal model proposes and is equipped with some oil storage holes for oil storage, water curtain drilling, uses
In a representative section and two groups of advantage cracks of numerical analysis, the oil storage hole and water curtain drilling are set in practice of construction ratio
Put in 3-D geometric model, axis direction of the representative section perpendicular to oil storage hole.
Further, the inclination angle in two groups of advantage cracks is respectively 60 ° and 80 °.
Further, the setting of the initial condition includes the setting of governing equation, the setting of boundary condition and physics
The setting of parameter.
Further, the physical parameter includes rockmass infiltration coefficient, effective gap width of rock cranny and crack
Spacing.
Further, described under the conditions of slip casting, respectively to having, dig into row Pore Pressure without oil storage hole standard-sized sheet under the conditions of water curtain
The numerical simulation of power includes：
Under the conditions of simulation is in slip casting condition and without water curtain, pore water pressure point of the standard-sized sheet digging in oil storage hole at the classical section
Cloth cloud atlas, obtains the distributed data of pore water pressure under the conditions of this；
Simulation in slip casting condition and under the conditions of having water curtain, the pore water pressure point that oil storage hole standard-sized sheet is dug at the classical section
Cloth cloud atlas, obtains the distributed data of pore water pressure under the conditions of this.
Compared with prior art, during a kind of cavern excavation of the invention seepage flow Changing Pattern method for numerical simulation,
By numerical simulation software at different conditions, the numerical simulation for digging into row pore pressure wide open to oil storage, by under different condition
The pore pressure in oil storage hole is contrasted with steady pressure value respectively, to obtain the data of Water tight during the wide open digging of oil storage,
Seepage effect for the wide open digging of oil storage provides strong theory and technology support.
Description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the schematic diagram of the 3-D geometric model that the present invention is provided；
Fig. 2 is the schematic diagram of oil storage hole geometry scale-up model inside 3-D geometric model in Fig. 1；
Fig. 3 is the schematic diagram of A-A ' section models in Fig. 2；
Fig. 4 is pore water pressure cloud charts before the wide open digging of oil storage；
Fig. 5 is without the wide open digging ground floor pore water pressure cloud charts of oil storage under the conditions of water curtain；
Fig. 6 is without the wide open digging second layer pore water pressure cloud charts of oil storage under the conditions of water curtain；
Fig. 7 is without the wide open digging third layer pore water pressure cloud charts of oil storage under the conditions of water curtain；
Fig. 8 is to monitor pore water pressure change curve at line under different condition；
Fig. 9 is that have the wide open digging ground floor pore water pressure cloud charts of oil storage under the conditions of water curtain；
Figure 10 is that have the wide open digging second layer pore water pressure cloud charts of oil storage under the conditions of water curtain；
Figure 11 is that have the wide open digging third layer pore water pressure cloud charts of oil storage under the conditions of water curtain；
Figure 12 is to monitor pore water pressure change curve at line under different condition；
Figure 13 is the pore water pressure cloud charts for not considering oil storage hole standard-sized sheet digging under the conditions of crack without water curtain；
Figure 14 is the pore water pressure cloud charts for having water curtain not consider oil storage hole standard-sized sheet digging under the conditions of crack；
Figure 15 is without region hole swelling water distribution cloud atlas under the conditions of water curtain；
Figure 16 is that have region hole swelling water distribution cloud atlas under the conditions of water curtain；
Figure 17 is to dig pore water pressure cloud charts at the A-A ' sections without oil storage hole standard-sized sheet under the conditions of water curtain slip casting；
Figure 18 is to monitor the pore water pressure curve chart at line under the conditions of different equivalent gap width；
Figure 19 is that have oil storage hole standard-sized sheet under the conditions of water curtain slip casting to dig pore water pressure cloud charts at the A-A ' sections.
Specific embodiment
In conjunction with accompanying drawing, presently preferred embodiments of the present invention is elaborated.
The present invention provides the method for numerical simulation of seepage flow Changing Pattern during a kind of wide open digging of oil storage, including following step
Suddenly：
A1, according to Hydrogeological Analysis, determine 1 Ku Zhi areas groundwater type of oil storage hole, level of ground water, and by number
Value simulation software sets up a 3-D geometric model to storehouse location area；
A2, logarithm value simulation software carry out the setting of initial condition, and 1 pore pressure of oil storage hole is simulated, to obtain
Obtain the steady pressure value of 1 pore pressure of oil storage hole under initial condition；
A3, at different conditions, oil storage hole 1 is excavated carries out the numerical simulation of pore pressure, by oil storage under different condition
The pore pressure in hole 1 is contrasted with steady pressure value respectively；
A4, according to comparing result, judge whether oil storage hole 1 meets water sealing condition：If the pore water pressure in oil storage hole 1 is steady
Level pressure force value, then oil storage hole 1 meet water sealing condition；If the pore water pressure in oil storage hole 1 is less than steady pressure value, oil storage hole 1 is not
Meet water sealing condition.
As shown in figure 1,3-D geometric model internal model is proposed and being equipped with some oil storage holes 1, water curtain drillings for oil storage, being used for
One representative section of numerical analysis and two groups of advantage cracks, oil storage hole 1 and water curtain drilling exist by practice of construction ratio setting
In 3-D geometric model, axis direction of the representative section perpendicular to oil storage hole 1.
In the present embodiment, oil storage hole 1 has ten, and the X/Y plane size of 3-D geometric model is 2200m × 2200m, its
In, axis direction of the X-direction for oil storage hole 1.Apart from 1 base plate 140m of oil storage hole, absolute altitude is -200m for 3-D geometric model bottom surface,
Whole model Z-direction span is that -200m arrives 270m.Design attitude modeling is pressed in oil storage hole 1 and water curtain drilling, and whole model is not
The auxiliary equipment such as consideration construction tunnel.Model vertical direction is divided into three layers altogether：Severely-weathered layer, middle weathered layer and micro- weathered layer.
As shown in Figures 2 and 3, classical section is A-A ' sections, and A-A ' sections are perpendicular to 1 axis direction of oil storage hole.Consideration is most
Unfavorable factor.According to the rock mass advantage characteristics of fracture development research of Ku Zhi areas, there is 1 axle of high dip angle and oil storage hole in local area advantage crack
The characteristics of line wide-angle intersects, reduces with depth, therefore choose two groups of advantage cracks arrangements that inclination angle is 60 ° and 80 °.
In the present embodiment, numerical simulation software package is included from COMSOL Multiphysics numerical simulation softwares, is used
" Darcy laws " module in COMSOL Multiphysics numerical simulation softwares carries out model foundation and numerical computations, wherein
" Crevice gold " frontier properties model is contained under " Darcy laws " module.
Specifically, the setting of logarithm value simulation software initial condition includes the setting of governing equation, the setting of boundary condition
And the setting of physical parameter.Wherein, the program of governing equation and boundary condition Dou Shi logarithm values simulation software is arranged, specifically not
It is described in detail.Physical parameter includes rockmass infiltration coefficient, effective gap width of rock cranny and fracture spacing, by this
A little parameters according to correlational study and documents and materials and examine on the spot report and are determined, and are input to numerical simulation software
In, it is ensured that the verity of analog data.In the present embodiment, according to correlational study and documents and materials, complete granite oozes
Permeability is very small, and infiltration coefficient is typically 2 × 10-9-2×10-11Cm/s,-9Incorporation engineering exploration report, the complete rock of selection
Body coefficient of permeability K s=1 × 10-11m/s.According to the water lifting test in exploration report and water injection test data, to different depth
Granite infiltration coefficient is calculated and is fitted by exponential type curve, and fitting expression is as follows：
K=4 × 10-7e0 . 0059z
In formula, infiltration coefficient unit is m/s, and z is vertical elevation, the regression coefficients R 2=0.9871.Do not considering crack
Under the conditions of slip casting, effective gap width df in granitic mass crack is set to 1.0mm, and fracture spacing D presses 10m and calculates per bar, so flower
The computing formula of hilllock lithofraction gap coefficient of permeability K f is：
KsD+Kfdf=K (D+df)
So, rock cranny infiltration coefficient is approximately：Kf=4 × 10-3e0.0059z
Being excavated due to oil storage hole 1 to cause natural groundwater and 1 surrounding of oil storage hole certain seepage region occur.In order to divide
Cavern excavation percolation law and Water tight condition under analysis reservoir area crack rock.In conjunction with COMSOL Multiphysics numerical simulations
Software use habit, is provided with monitoring line along A-A ' sections at the water curtain roadway floor above oil storage hole 1, and in oil storage hole 1
Both sides arrange several monitoring points.
At different conditions, the numerical simulation that the excavation of oil storage hole 1 carries out pore pressure is included：Under the conditions of without water curtain,
The numerical simulation that pore pressure is carried out to 1 stage excavation of oil storage hole；Under the conditions of having water curtain, 1 stage excavation of oil storage hole is carried out
The numerical simulation of pore pressure；Under the conditions of crack is not considered, respectively to having, dig into row without 1 standard-sized sheet of oil storage hole under the conditions of water curtain
The numerical simulation of pore pressure；And under the conditions of slip casting, respectively to having, dig into row hole without 1 standard-sized sheet of oil storage hole under the conditions of water curtain
The numerical simulation of gap pressure.
Oil storage hole 1 is excavated three layers of foundation practice of construction order point and is carried out, and per layer of cutting depth 10m, in A-A ' section moulds
During plan, 1 per layer of each oil storage hole is disposable excavation.According to correlational study, the condition for meeting oil cellar " water seal " property is
Vertical hydraulic gradient is more than 1, it is desirable to have more than the stable level of ground water of 1 maximum height of oil storage hole above underground oil storage hole 1, local
Lower water level exceed oil storage hole 1 maximum height when, the pore water pressure having above oil storage hole 1 be steady pressure value, Cai Nengman
The water sealing condition in sufficient oil storage hole 1.In the present embodiment, the stable level of ground water in 1 Ku Zhi areas of oil storage hole is 30m, i.e., in oil storage hole 1
It is 300kPa that top will have the pore water pressure of 300kPa, i.e. steady pressure value, could meet water sealing condition.Fig. 4 is oil storage hole 1
Pore water pressure cloud atlas before excavating, 2 in Fig. 4 are 300kPa equivalence pressure lines.
Under the conditions of without water curtain, the numerical simulation that 1 stage excavation of oil storage hole carries out pore pressure is comprised the following steps：
When ground floor is excavated in B1, simulation oil storage hole 1, pore water pressure cloud charts (as shown in Figure 5), obtain the condition lower opening
Gap hydraulic pressure distributed data.As shown in Figure 5：(1) after oil storage hole 1 is excavated, level of ground water has different degrees of decline.With oil storage
The crack of the connection of hole 1 becomes subsoil water and infiltrates passage, subsoil water mainly from rock cranny to hole in infiltrate, between oil storage hole 1 according to
So there is larger pore water pressure.(2) the 8th to No. ten oil storage hole 1 that counts from a left side is opened as buried depth is relatively shallower
Certain cone of depression can be formed after digging ground floor, according to the contour 2 of 300kPa as can be seen that above No. ten oil storage hole 1
Pore water pressure decline the most substantially, but not with top insertion, illustrate to remain to meet water sealing condition.(3) as crack is inclined
To relation, the pressure change on the right side of No. ten oil storage hole 1 has the changing value on the left of significantly greater than number one oil storage hole 1, overall
For, 1 ground floor of oil storage hole is excavated to be affected on area interstitial flow field less, and maximum pore water pressure is 3.38MPa.
When the second layer is excavated in B2, simulation oil storage hole 1, pore water pressure cloud charts (as shown in Figure 6), obtain the condition lower opening
Gap hydraulic pressure distributed data.It will be appreciated from fig. 6 that the variation tendency of entirety is identical with ground floor is excavated, subsoil water is along rock cranny to hole
Inside infiltrate, the pore water pressure between oil storage hole 1 declines less, and model area maximum pore water pressure drops to 3.21MPa.But with
Oil storage hole 1 is excavated and arrives the second layer, and level of ground water further declines, and the pore water pressure above Ge Zhu caverns declines and also further increases
Greatly, cone of depression is also expanded to above No. six oil storage hole 1.According to the contour 2 of 300kPa as can be seen that No. ten oil storage hole
1 has there is connected region, illustrates to be unsatisfactory for water sealing condition.
When third layer is excavated in B3, simulation oil storage hole 1, pore water pressure cloud charts (as shown in Figure 7), obtain the condition lower opening
The distributed data of gap hydraulic pressure.As shown in Figure 7, overall WATER LEVEL CHANGES region is identical with front two-layer excavations, level of ground water with
1 top pore water pressure drop-out value of oil storage hole further increases, and model area maximum pore water pressure drops to 3.18MPa.Work as storage
During oily 1 whole excavations of hole, cone of depression is expanded to above No. five oil storage hole 1.Can be seen that according to the contour 2 of 300kPa
All there is connected region in No. nine and No. ten oil storage hole 1, illustrate to be unsatisfactory for water sealing condition, and number one is stored up to No. three
Also occurs zigzag decline at rock cranny above oily hole 1.
Fig. 8 is the pore water pressure curve chart under different operating modes at monitoring line.Oil storage more can intuitively be found from figure
Seepage action of ground water situation of change of the hole 1 in the different excavation stages.As shown in Figure 8, under non-cutting status, pore water pressure is basic
With topography variation, and the stable underground reservoir of 1 overlying of oil storage hole is described.With the successively excavation in oil storage hole 1, level of ground water is not
Disconnected decline, and hole at the rock cranny in the middle of the rock cranny connected with oil storage hole 1, not connected is occurred mainly in oil storage hole 1
Gap water pressure is still in of a relatively high position.After the completion of all excavating, the pore water pressure above part oil storage hole 1 is all little
In the steady pressure value of 300kPa, illustrate that Water tight deficiency is excavated in oil storage hole 1 under the conditions of without water curtain, is easily produced oil product and is let out
Leakage.
Under the conditions of having water curtain, the numerical simulation that 1 stage excavation of oil storage hole carries out pore pressure is comprised the following steps：
Pore water pressure cloud charts (such as Fig. 9), pore water under the conditions of being somebody's turn to do when ground floor is excavated in C1, simulation oil storage hole 1
Pressure distributed data.As shown in Figure 9, in the case of water curtain is added, the pore water pressure above oil storage hole 1 declines area and is obviously reduced,
But water curtain drilling can not extend completely through rock cranny above main cavern, the crack connected with oil storage hole 1 is by drilling influence of hydraulic pressure
Very little.So still defining certain cone of depression in the 8th to No. ten relatively shallower oil storage hole 1 of buried depth.
Pore water pressure cloud charts (such as Figure 10), pore water under the conditions of being somebody's turn to do when the second layer is excavated in C2, simulation oil storage hole 1
Pressure distributed data.As shown in Figure 10, overall variation tendency is identical with ground floor is excavated, and subsoil water enters into hole along rock cranny
Ooze, the pore water pressure between oil storage hole 1 declines less.Although water curtain system is with the addition of, with No. six and No. ten oil storage hole 1
Pore water pressure at the rock cranny of connection declines area and has still passed through water curtain system.Contour according to 300kPa can be seen
Go out, No. ten oil storage hole 1 has the connected region of very little at water curtain position, illustrates to be unsatisfactory for water sealing condition.This also indicates that,
Intersect with 1 axis low-angle of oil storage hole or nearly parallel development high steep dip rock cranny, fully can not connect therewith in water curtain drilling
In the case of logical, still with the presence of the situation that water seal is not enough, if not taking the other measures such as the encryption water curtain spacing of wells, water seal
Oil depot is possible to seepage " blind area " occur.
When third layer is excavated in C3, simulation oil storage hole 1, pore water pressure cloud charts (as shown in figure 11), obtain the condition lower opening
The distributed data of gap hydraulic pressure.As shown in Figure 11, overall WATER LEVEL CHANGES region is identical with front two-layer excavation.Contrast is without water curtain
Under the conditions of see that Fig. 8, cone of groundwater depression are equally occurred mainly in above the 5th to No. ten oil storage hole 1, but according to 300kPa
Contour 2 as can be seen that No. nine oil storage hole 1 above water curtain system serve water seal effect, under without water curtain operating mode
Connected region is changed into enclosed region, is allowed to meet Water tight condition.But still there is narrow and small connection above No. ten oil storage hole 1
Region.
If Figure 12 is to monitor the pore water pressure curve chart at line under different condition.As can be seen that oil storage hole 1 is successively opened
Dig, 1 top pore water pressure of oil storage hole can be caused constantly to decline, and occur mainly in the rock cranny connected in oil storage hole 1 and work as
In, at the rock cranny that do not connect with oil storage hole 1, pore water pressure is still in of a relatively high position.When all excavation is completed
Afterwards, even if adding water curtain system, the situation less than 300kPa steady pressure values still occurs.But do not considering rock cranny
When, the interpolation of water curtain system can meet water sealing condition in Shi Zhu caverns very well.
Under the conditions of crack is not considered, respectively to having, dig into the number of row pore pressure without 1 standard-sized sheet of oil storage hole under the conditions of water curtain
Value simulation includes：
Simulation do not consider crack condition and without water curtain under the conditions of, 1 standard-sized sheet of oil storage hole dig pore water pressure cloud charts (such as
Shown in Figure 13), the distributed data of pore water pressure under the conditions of this is obtained, while the water yield to oil storage hole 1 is simulated, is somebody's turn to do
Under the conditions of water yield data.As shown in Figure 13, in the case of crack is not considered, cavern excavation can form overall large-scale landing
Funnel, the pore water pressure above oil storage hole 1 and between oil storage hole 1 can decline rapidly, and oil storage hole 1 in an intermediate position
Drop-out value of the pore water pressure drop-out value more than both sides oil storage hole 1.Model area maximum pore water pressure only has 2.82MPa.According to
The contour 2 of 300kPa is as can be seen that whole oil storage holes 1 are unsatisfactory for water sealing condition.
Under the conditions of not considering crack condition and having water curtain, the pore water pressure cloud charts that 1 standard-sized sheet of oil storage hole digs are (such as simulation
Shown in Figure 14), the distributed data of pore water pressure under the conditions of this is obtained, while the water yield to oil storage hole 1 is simulated, is somebody's turn to do
Under the conditions of water yield data.As shown in Figure 14, add water curtain system and make to define above active room and relatively thick stably contain
Water layer, makes the oil storage hole 1 for being unsatisfactory for originally water sealing condition all be wrapped up by stable aqueous layer, and so as to meet Water tight, excavation is led
The pore water pressure decline of cause occurs mainly in cavern peripheral region.
If Figure 15,16 are the region hole swelling water without water curtain and under main cavern's complete section face is excavated under the conditions of having water curtain respectively
Amount cloud charts.It can be seen that under the conditions of adding water curtain, having a higher stable water pressure layer above oil storage hole 1.There is water curtain
Water yield under operating mode will be significantly greater than without water curtain operating mode.In the case where having water curtain and subsoil water collective effect, the stable retention of excessive fluid in oil storage hole 1
Amount amount to 4692.42m3/d, without water curtain under the conditions of water yield be 2292.85m3/d.
In conjunction with conventional engineering experience, as underground water-seal oil depot is typically all built under thicker stable aqueous layer, and oil storage
There is the characteristics of high side wall, large span and few supporting in hole 1, causes rock cranny in 1 digging process of oil storage hole to be chronically exposed to air
Central in infiltration state, along with the setting of artificial water curtain so that cavern's water yield further increases, this be subsoil water oil sealing
The construction in storehouse and operation all cause very big inconvenience.Under the conditions of rock cranny slip casting, the change of analyzed area pore water pressure
Rule.
Specifically, under the conditions of slip casting, respectively to having, dig into row pore pressure without 1 standard-sized sheet of oil storage hole under the conditions of water curtain
Numerical simulation includes：
Under the conditions of simulation is in slip casting condition and without water curtain, pore water pressure of 1 standard-sized sheet of the oil storage hole digging at the classical section
Cloud charts (as shown in figure 17), obtain the distributed data of pore water pressure under the conditions of this.As shown in Figure 17, by effective slip casting
Measure, rock cranny gap width diminish, and infiltration coefficient reduces so that region pore water pressure does not have too big decline.After slip casting not
Only level of ground water is in a higher position, and the pore water pressure drop-out value around oil storage hole 1 also significantly reduces.
If Figure 18 is the pore water pressure curve chart at monitoring line under the conditions of different equivalent gap width.As shown in Figure 18, equivalent
Gap width is bigger, illustrates that the slip casting effect of rock cranny is poorer, so as to the pore water pressure decline above oil storage hole 1 is also more obvious.
As a width of 0.3mm of effect gap, the pore water pressure at crack is all higher than 300kPa, and water seal sexual satisfaction condition now is described.
Simulation in slip casting condition and under the conditions of having water curtain, the pore water pressure that 1 standard-sized sheet of oil storage hole is dug at the classical section
Cloud charts (as shown in figure 19), obtain the distributed data of pore water pressure under the conditions of this.It appears from figure 19 that by effective slip casting
Measure, rock cranny gap width diminish, and infiltration coefficient reduces so that region pore water pressure does not have too big decline, and oil storage hole 1
The pore water pressure of surrounding declines region and also significantly reduces.As a width of 0.3mm of effect gap, the pore water pressure at crack is all higher than
300kPa, illustrates water seal sexual satisfaction condition now.
In sum, by numerical simulation software at different conditions, oil storage hole 1 is excavated carries out the numerical value of pore pressure
Simulation, the pore pressure in oil storage hole 1 under different condition is contrasted with steady pressure value respectively, is excavated with obtaining oil storage hole 1
During Water tight data, the seepage effect excavated for oil storage hole 1 provides strong theory and technology support.
It should be appreciated that above example is only in order to illustrate technical scheme, rather than a limitation, to ability
For field technique personnel, the technical scheme described in above-described embodiment can be modified, or special to which part technology
Levying carries out equivalent；And all such modifications and replacement, should all belong to the protection domain of claims of the present invention.
Claims (10)
1. during a kind of wide open digging of oil storage seepage flow Changing Pattern method for numerical simulation, it is characterised in that comprise the following steps：
A1, according to Hydrogeological Analysis, determine oil storage cave depot location area groundwater type, level of ground water, and imitative by numerical value
True software sets up a 3-D geometric model to storehouse location area；
A2, the setting for carrying out initial condition to the numerical simulation software, and oil storage hole pore pressure is simulated, to obtain
The steady pressure value of oil storage hole pore pressure under initial condition；
A3, at different conditions, the numerical simulation for digging into row pore pressure wide open to oil storage, by the hole in oil storage hole under different condition
Gap pressure is contrasted with steady pressure value respectively；
A4, according to comparing result, judge whether oil storage hole meets water sealing condition：If the pore water pressure in oil storage hole is steady pressure
Value, then oil storage hole meets water sealing condition；If the pore water pressure in oil storage hole is less than steady pressure value, oil storage hole is unsatisfactory for water seal bar
Part.
2. during the wide open digging of oil storage according to claim 1 seepage flow Changing Pattern method for numerical simulation, its feature exists
In, described at different conditions, the numerical simulation for digging into row pore pressure wide open to oil storage includes：
Under the conditions of without water curtain, pore pressure is carried out to oil storage hole stage excavation numerical simulation；
Under the conditions of having water curtain, pore pressure is carried out to oil storage hole stage excavation numerical simulation；
Under the conditions of crack is not considered, respectively to having, dig into the Numerical-Mode of row pore pressure without oil storage hole standard-sized sheet under the conditions of water curtain
Intend；
And under the conditions of slip casting, respectively to having, dig into the numerical simulation of row pore pressure without oil storage hole standard-sized sheet under the conditions of water curtain.
3. during the wide open digging of oil storage according to claim 2 seepage flow Changing Pattern method for numerical simulation, its feature exists
In, described under the conditions of without water curtain, the numerical simulation that oil storage hole stage excavation carries out pore pressure is comprised the following steps：
B1, simulation oil storage wide open dig ground floor when pore water pressure cloud charts, pore water pressure distributed data under the conditions of being somebody's turn to do；
B2, simulation oil storage wide open dig the second layer when pore water pressure cloud charts, pore water pressure distributed data under the conditions of being somebody's turn to do；
B3, simulation oil storage wide open dig third layer when pore water pressure cloud charts, obtain the distributed data of pore water pressure under the conditions of this.
4. during the wide open digging of oil storage according to claim 2 seepage flow Changing Pattern method for numerical simulation, its feature exists
In, described under the conditions of having water curtain, the numerical simulation that oil storage hole stage excavation carries out pore pressure is comprised the following steps：
C1, simulation oil storage wide open dig ground floor when pore water pressure cloud charts, pore water pressure distributed data under the conditions of being somebody's turn to do；
C2, simulation oil storage wide open dig the second layer when pore water pressure cloud charts, pore water pressure distributed data under the conditions of being somebody's turn to do；
C3, simulation oil storage wide open dig third layer when pore water pressure cloud charts, obtain the distributed data of pore water pressure under the conditions of this.
5. during the wide open digging of oil storage according to claim 2 seepage flow Changing Pattern method for numerical simulation, its feature exists
In, described under the conditions of crack is not considered, respectively to having, dig into the numerical value of row pore pressure without oil storage hole standard-sized sheet under the conditions of water curtain
Simulation includes：
Simulation do not consider crack condition and without water curtain under the conditions of, oil storage hole standard-sized sheet dig pore water pressure cloud charts, be somebody's turn to do
Under the conditions of pore water pressure distributed data, while being simulated to the water yield in oil storage hole, obtain the number of water yield under the conditions of this
According to；
Under the conditions of not considering crack condition and having water curtain, the pore water pressure cloud charts that oil storage hole standard-sized sheet digs are somebody's turn to do for simulation
Under the conditions of pore water pressure distributed data, while being simulated to the water yield in oil storage hole, obtain the number of water yield under the conditions of this
According to.
6. during the wide open digging of oil storage as claimed in any of claims 2 to 5 seepage flow Changing Pattern numerical simulation
Method, it is characterised in that the 3-D geometric model internal model proposes and is equipped with some oil storage holes for oil storage, water curtain drilling, uses
In a representative section and two groups of advantage cracks of numerical analysis, the oil storage hole and water curtain drilling are set in practice of construction ratio
Put in 3-D geometric model, axis direction of the representative section perpendicular to oil storage hole.
7. during the wide open digging of oil storage according to claim 6 seepage flow Changing Pattern method for numerical simulation, its feature exists
In the inclination angle in two groups of advantage cracks is respectively 60 ° and 80 °.
8. during the wide open digging of oil storage according to claim 6 seepage flow Changing Pattern method for numerical simulation, its feature exists
In the setting of the initial condition includes the setting of governing equation, the setting of boundary condition and the setting of physical parameter.
9. during the wide open digging of oil storage according to claim 8 seepage flow Changing Pattern method for numerical simulation, its feature exists
In the physical parameter includes rockmass infiltration coefficient, effective gap width of rock cranny and fracture spacing.
10. during the wide open digging of oil storage according to claim 6 seepage flow Changing Pattern method for numerical simulation, its feature exists
In, described under the conditions of slip casting, respectively to having, dig into the numerical simulation bag of row pore pressure without oil storage hole standard-sized sheet under the conditions of water curtain
Include：
Under the conditions of simulation is in slip casting condition and without water curtain, pore water pressure distribution clouds of the standard-sized sheet digging in oil storage hole at the classical section
Figure, obtains the distributed data of pore water pressure under the conditions of this；
Simulation in slip casting condition and under the conditions of having water curtain, the pore water pressure distribution clouds that oil storage hole standard-sized sheet is dug at the classical section
Figure, obtains the distributed data of pore water pressure under the conditions of this.
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