CN112834256A - Test device and test method for simulating mine water reinjection - Google Patents
Test device and test method for simulating mine water reinjection Download PDFInfo
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- CN112834256A CN112834256A CN202110016652.4A CN202110016652A CN112834256A CN 112834256 A CN112834256 A CN 112834256A CN 202110016652 A CN202110016652 A CN 202110016652A CN 112834256 A CN112834256 A CN 112834256A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 238000012360 testing method Methods 0.000 title claims abstract description 68
- 238000010998 test method Methods 0.000 title claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 42
- 238000005086 pumping Methods 0.000 claims abstract description 35
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 230000035699 permeability Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 abstract description 110
- 238000005065 mining Methods 0.000 abstract description 12
- 238000005553 drilling Methods 0.000 abstract description 7
- 239000011229 interlayer Substances 0.000 abstract description 3
- 239000011435 rock Substances 0.000 description 13
- 238000005755 formation reaction Methods 0.000 description 12
- 239000011148 porous material Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides a test device for simulating mine water reinjection and a test method for simulating mine water reinjection. The invention provides a test device for simulating mine water reinjection, which comprises: the device comprises a reinjection box, a plurality of interlayers are arranged inside the reinjection box, and the interlayers comprise a cover layer, a storage layer and a bottom layer which are sequentially arranged, wherein the bottom layer is arranged above the bottom surface of the reinjection box; the first end of the reinjection well penetrates through the top surface and the cover layer of the reinjection box and extends into the storage layer, and the second end of the reinjection well extends to the outside of the reinjection box; and the water pumping assembly is connected with the second end of the reinjection well. According to the test device for simulating the mine water reinjection, the actual reinjection stratum is scaled in an equal proportion, the reinjection pressure and the reinjection amount during reinjection of the test device are detected, the reinjection pressure and the reinjection amount of the actual reinjection mining area are further determined, data support is provided for the actual mine water reinjection project, meanwhile, the reinjection amount of the mine water can be predicted and analyzed, and blind drilling is avoided.
Description
Technical Field
The invention relates to the technical field of mine water treatment, in particular to a test device for simulating mine water reinjection and a test method for simulating mine water reinjection.
Background
At present, in a mine water deep stratum reinjection project, in order to know the injectability of the stratum around a mining area and the approximate range of a reservoir stratum, one or more test holes are required to be arranged for reinjection test, generally, the deep stratum is required to be drilled more than kilometers, one test well is required to consume dozens of ten thousand yuan, the cost is huge, meanwhile, underground water and environment pollution can be caused by drilling, and therefore, if a simulation test for the reinjection of mine water can be realized, invalid drilling caused by site selection errors is avoided, and a large amount of capital investment can be saved.
Disclosure of Invention
The invention provides a test device for simulating mine water reinjection and a test method for simulating mine water reinjection, which are used for solving the defect of high production cost caused by blind drilling during mine water reinjection in the prior art.
The invention provides a test device for simulating mine water reinjection, which comprises: the device comprises a reinjection box, a plurality of isolation layers and a plurality of storage layers, wherein the isolation layers comprise a cover layer, a storage layer and a bottom layer which are sequentially arranged, and the bottom layer is arranged above the bottom surface of the reinjection box; a first end of the reinjection well penetrates through the top surface of the reinjection box and the cover layer and extends into the storage layer, and a second end of the reinjection well extends to the outside of the reinjection box; and the water pumping assembly is connected with the second end of the reinjection well.
According to the test device for simulating the mine water reinjection, which is provided by the invention, a plurality of supporting pieces are arranged inside the reinjection box, and each supporting piece is respectively used for arranging the cover layer, the storage layer and the bottom layer.
According to the test device for simulating the mine water reinjection, which is provided by the invention, a plurality of openings are formed in the side surface of the reinjection box, and are respectively arranged corresponding to the plurality of supporting pieces, so that the supporting pieces and any one of the cover layer, the storage layer and the bottom layer arranged on the supporting pieces can be pulled out of the reinjection box.
According to the test device for simulating the mine water reinjection, provided by the invention, the top surface of the reinjection box is detachably connected with the reinjection box so as to replace the cover layer, the storage layer or the bottom layer.
According to the test device for simulating the mine water reinjection, which is provided by the invention, the water pumping assembly comprises: a water tank; one end of the water pumping pipe is connected with the second end of the reinjection well, and the other end of the water pumping pipe is connected with the water tank; and the water suction pump is connected with the water suction pipe.
The invention also provides a method for testing by using the testing device for simulating mine water reinjection, which comprises the following steps: proportionally setting a test device according to formation information, wherein the test device comprises the reinjection box, the reinjection well and the water pumping assembly; and injecting water back into the reinjection tank through the water pumping assembly, and predicting reinjection pressure and reinjection amount.
According to the test method for simulating the mine water reinjection, provided by the invention, the step of arranging the test devices in equal proportion according to the formation information further comprises the following steps of: acquiring the stratum information, wherein the stratum information comprises: lithology, porosity, permeability coefficient, and water retention coefficient of the cap layer, the reservoir layer, and the base layer.
According to the test method for simulating the mine water reinjection, provided by the invention, the step of arranging the test devices in equal proportion according to the formation information further comprises the following steps of: selecting a scaling, wherein the scaling is one tenth to one hundredth.
According to the test method for simulating the mine water reinjection, provided by the invention, the step of reinjecting water into the reinjection box through the water pumping assembly and predicting reinjection pressure and reinjection amount further comprises the following steps: and recording corresponding reinjection time at different reinjection speeds, determining a linear equation, and calculating reinjection pressure according to the linear equation.
According to the test device for simulating the mine water reinjection, provided by the invention, the stratum is generalized into the reinjection box, the cover layer, the storage layer and the bottom layer are manufactured in the reinjection box in an equal-proportion scaling mode according to the stratum lithology of the actual reinjection mining area, the reinjection well is arranged in the reinjection box in an equal-proportion scaling mode, so that the reinjection pressure and the reinjection quantity during the reinjection of the test device are detected, the reinjection pressure and the reinjection quantity of the actual reinjection mining area are further determined, data support is provided for the actual mine water reinjection engineering, meanwhile, the reinjection quantity of the mine water can be predicted and analyzed, the problem of high production cost caused by blind drilling due to site selection errors is avoided, and the economic cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a test device for simulating mine water reinjection, provided by the invention;
FIG. 2 is a flow chart of a test method for simulating mine water reinjection provided by the invention;
reference numerals:
10: a reinjection tank; 11: a cap layer; 12: a storage layer;
13: a bottom layer; 20: and (4) reinjecting the oil into the well.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The test device for simulating mine water reinjection and the test method for simulating mine water reinjection of the invention are described below with reference to fig. 1 and 2.
As shown in fig. 1, an embodiment of the present invention provides a test apparatus for simulating mine water reinjection, including: a refill tank 10, a refill well 20, and a water pumping assembly. The interior of the reinjection box 10 is provided with a plurality of interlayers, which comprise a cover layer 11, a storage layer 12 and a bottom layer 13, wherein the cover layer 11, the storage layer 12 and the bottom layer 13 are sequentially arranged, the bottom layer 13 is arranged above the bottom surface of the reinjection box 10, and the cover layer 11 is arranged below the top surface of the reinjection box 10. A first end of the return well 20 extends through the top surface of the return tank 10 and the cover layer 11 to the storage layer 12, and a second end of the return well 20 extends outside the return tank 10 and is connected to the water pumping assembly to return water to the storage layer 12 through the water pumping assembly.
Specifically, the test device for simulating the reinjection of mine water provided by the embodiment of the invention generalizes the whole reinjection stratum into the reinjection box 10, and the simulated stratum structure in the reinjection box 10 is provided with a cover layer 11, a storage layer 12 and a bottom layer 13, wherein the cover layer 11 is usually a water-proof rock layer such as mudstone and siltstone, the storage layer 12 is sandstone, and the bottom layer 13 is also mudstone or sandstone. Furthermore, in the actual test process, related parameters such as permeability coefficients, effective pores, water storage coefficients and the like of different layers can be obtained according to the lithology of the stratum of the actual reinjection mining area so as to simulate actual rock strata, and further, specific parameter values such as permeability coefficients, effective pores, water storage coefficients and the like can be selected according to local empirical values.
Further, the thicknesses of the cover layer 11, the storage layer 12 and the bottom layer 13 and the distances among the layers are reduced in an equal proportion according to the stratum characteristics of the actual reinjection mining area, the height of the reinjection well 20 is reduced in an equal proportion according to the depth of the reinjection layer, the actual construction process is simulated, and the reinjection pressure and the reinjection amount tested by the test device are close to the data of the actual mine water reinjection.
In the test process, the water pumping assembly injects water into the reinjection well 20, the minimum pressure of the water pumping assembly capable of injecting water into the reinjection box 10 and the reinjection pressures at different reinjection speeds are observed, a linear equation is determined according to different reinjection speeds and the reinjection time at each reinjection speed, and the reinjection pressure and the reinjection amount of the test device are predicted, wherein the reinjection pressure and the reinjection amount are the reinjection pressure and the reinjection amount during actual mine water reinjection.
Further, in one embodiment of the present invention, the pumping assembly may include a pumping tube and a pump to inject water into the storage layer, and the minimum pressure required for refilling may be determined by varying the pumping pressure of the pump.
Further, in one embodiment of the present invention, scaling is typically scaled down to the original tenth to hundredth range. If the actual reinjection depth is 3000m, the reinjection well 20 may be set to 30m in the test apparatus for testing.
According to the test device for simulating the mine water reinjection, provided by the embodiment of the invention, the stratum is generalized into the reinjection box, the cover layer, the storage layer and the bottom layer are manufactured in the reinjection box in an equal-proportion scaling mode according to the stratum lithology of the actual reinjection mining area, the reinjection well is arranged in the reinjection box in an equal-proportion scaling mode, so that the reinjection pressure and the reinjection quantity during the reinjection of the test device are detected, the reinjection pressure and the reinjection quantity of the actual reinjection mining area are further determined, data support is provided for the actual mine water reinjection engineering, meanwhile, the reinjection quantity of the mine water can be predicted and analyzed, the problem of high production cost caused by blind drilling due to site selection errors is avoided, and the economic cost is reduced.
In one embodiment of the invention, the interior of the refill case 10 is provided with a plurality of supports, each for placing a cover layer 11, a storage layer 12 and a base layer 13, respectively. Specifically, can set up a plurality of support piece in reinjection case 10 to solve different stratums in different mining areas, its cover 11, storage layer 12 and bottom 13 thickness are different, and the problem of the distance difference between each layer position makes the test device press close to actual stratum structure setting, can carry out the mine water reinjection analogue test to different stratums in different mining areas simultaneously.
Optionally, in an embodiment of the present invention, the side of the refill case 10 is formed with a plurality of openings, each of which is disposed corresponding to one of the supports, so that the supports can be drawn out of the outside of the refill case 10. Specifically, the height of the opening should be as high as possible to satisfy the requirement that the layer with different thickness can be drawn out of the reinjection box 10 along with the support member for replacement.
Specifically, when the test device is installed, the thicknesses of the cap rock 11, the storage layer 12 and the bottom layer 13 and the distance between the layers can be determined according to the formation lithology of the actual reinjection mining area, and in order to enhance the applicability of the test device, the opening size of the side surface of the reinjection box 10 can be enlarged, so that the cap rock 11, the storage layer 12 or the bottom layer 13 with different thicknesses can be replaced. Meanwhile, the position of the opening corresponds to the position of the support, and when the distance between the two levels is changed, the cover layer 11, the storage layer 12, or the bottom layer 13 may be placed on different supports to satisfy the change of the distance between the layers.
Optionally, in an embodiment of the present invention, the top surface of the refill case 10 is detachably connected to the refill case 10, that is, the top surface of the refill case 10 may be a cover body covering the body of the refill case 10, and the cover layer 11, the storage layer 12 and the bottom layer 13 may be replaced by being placed above the refill case 10.
According to the test device for simulating the mine water reinjection, provided by the embodiment of the invention, the opening is formed in the side surface of the reinjection box or the top surface of the reinjection box is detachably connected with the reinjection box, so that the cover layer, the storage layer and the bottom layer in the reinjection box can be replaced according to different stratum lithology, the test device can be used for testing the mine water reinjection in different reinjection mining areas, the applicability is strong, and the economic cost can be greatly reduced.
In one embodiment of the present invention, a water pumping assembly comprises: the water storage layer 12 comprises a water tank, a water pumping pipe and a water pumping pump, wherein one end of the water pumping pipe is connected with the second end of the reinjection well 20, the other end of the water pumping pipe is connected with the water tank, and the water pumping pump is connected with the water pumping pipe so as to inject water in the water tank into the storage layer 12. Specifically, the minimum pressure value required by the reinjection can be determined by changing the pumping pressure of the water suction pump, meanwhile, the reinjection time at the corresponding reinjection speed is recorded by changing different reinjection speeds, a linear equation is determined, and the reinjection pressure and the reinjection amount are predicted. The reinjection pressure and the reinjection quantity are the reinjection pressure and the reinjection quantity during the reinjection of the mine water. The calculation formula of the mine water reinjection pressure is as follows:
Pwk=k1V2t+k2V+k3,
wherein, Pwk: reinjection pressure of mine water; v: the reinjection speed of mine water; t: reinjection time of mine water; k is a radical of1、k2、k3: a constant.
The refill amount is calculated by the formula:
Q=-Vbρgh(α+nβ),
wherein, Vb: total volume of reservoir space, m3(ii) a n: porosity, β: the compressibility of water; ρ: density of the reinjection liquid, kg/m3(ii) a g: gravity coefficient, N/Kg; h: thickness of the aqueous layer, m; alpha is the pore compression factor.
Furthermore, the water tank can be set to be a plurality of water tanks with different capacities, and the refilling amount of the test device can be estimated according to the residual water amount in the water tank during water injection.
As shown in fig. 2, the embodiment of the invention also provides a test method for simulating mine water reinjection. The method specifically comprises the following steps:
step 01: and (3) setting a test device according to the formation information in an equal scaling mode, wherein the test device comprises a reinjection box 10, a reinjection well 20 and a water pumping assembly.
Step 02: the water is reinjected into the reinjection tank 10 through the water pumping assembly, and reinjection pressure and reinjection amount are predicted.
Specifically, the formation information includes lithology of the cover layer 11, the storage layer 12 and the bottom layer 13, and permeability coefficient, effective pore space and other relevant parameters of each layer. And determining the thickness of each rock stratum, the depth between adjacent rock stratums and the depth of a reinjection layer according to the lithology distribution of the stratum of the actual reinjection region, the permeability coefficient and the effective pore of each layer, and then scaling to manufacture the test device according to the thickness of each rock stratum, the depth between the adjacent rock stratums and the depth of the reinjection layer in an equal proportion.
Generalizing the whole stratum into a reinjection box 10, then placing the cover layer 11, the storage layer 12 and the bottom layer 13 which are scaled in equal proportion into the reinjection box 10, enabling the reinjection well 20 to penetrate through the top surface of the reinjection box 10 and the cover layer 11 to extend into the storage layer 12, and enabling the water pumping assembly to inject water into the reinjection well 20 so as to detect reinjection pressure and reinjection amount.
Further, in an embodiment of the present invention, the step of proportionally setting the testing device according to the formation information further includes: and acquiring formation information. In particular, the formation information includes lithology of the cap layer 11, the reservoir layer 12, and the bottom layer 13. Generally, the cover layer 11 is typically a water-proof rock layer such as mudstone or siltstone, the storage layer 12 is sandstone, and the bottom layer 13 is also mudstone or sandstone. Furthermore, relevant parameters such as permeability coefficient, effective pore, water storage coefficient and the like of the cover layer 11, the storage layer 12 and the bottom layer 13 can be obtained according to the stratum lithology of the actual reinjection region, and specific parameter values can be selected according to local empirical values.
Further, in an embodiment of the present invention, the step of proportionally setting the testing device according to the formation information further includes: the scaling is selected to be one tenth to one hundredth, that is, the thickness of the original rock formations, the depth between adjacent rock formations and the depth of the reinjection layer are scaled to be in the range of one tenth to one hundredth according to the principle of convenient test.
Specifically, if the thickness of a certain rock stratum is 200m, the thickness of the reinjection layer is 3000m, and the test device after the equal scaling can be manufactured according to the proportion of one percent reduction, namely the thickness of a certain rock stratum in the test device is 2m, and the height of the reinjection well 20 is 30 m.
In one embodiment of the present invention, the step of predicting the refill pressure and the refill amount by refilling water into the refill tank 10 through the pumping assembly further comprises: and recording corresponding reinjection time at different reinjection speeds, determining a linear equation, and calculating reinjection pressure according to the linear equation.
Specifically, the calculation formula of the mine water reinjection pressure is as follows:
Pwk=k1V2t+k2V+k3,
wherein, Pwk: reinjection pressure of mine water; v: the reinjection speed of mine water; t: reinjection time of mine water; k is a radical of1、k2、k3: a constant.
The refill amount is calculated by the formula:
Q=-Vbρgh(α+nβ),
wherein, Vb: total volume of reservoir space, m 3; n: porosity, β: the compressibility of water; ρ: the density of the reinjection liquid, kg/m 3; g: gravity coefficient, N/Kg; h: thickness of the aqueous layer, m; alpha is the pore compression factor.
The predicted reinjection pressure and the reinjection amount can be calculated through the formula, and the reinjection pressure and the reinjection amount are the reinjection pressure and the reinjection amount when the mine water is actually reinjected.
According to the test method for simulating the mine water reinjection, which is provided by the embodiment of the invention, the actual reinjection pressure and the actual reinjection amount of the mine water reinjection can be predicted by setting the test device and predicting the reinjection pressure and the reinjection amount of the test device, so that data support is provided for the mine water reinjection engineering, and the economic loss caused by blind drilling due to site selection errors can be avoided.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a test device of simulation mine water reinjection which characterized in that includes:
the device comprises a reinjection box, a plurality of isolation layers and a plurality of storage layers, wherein the isolation layers comprise a cover layer, a storage layer and a bottom layer which are sequentially arranged, and the bottom layer is arranged above the bottom surface of the reinjection box;
a first end of the reinjection well penetrates through the top surface of the reinjection box and the cover layer and extends into the storage layer, and a second end of the reinjection well extends to the outside of the reinjection box;
and the water pumping assembly is connected with the second end of the reinjection well.
2. The test device for simulating mine water reinjection according to claim 1, wherein a plurality of supporting members are arranged inside the reinjection tank, and each supporting member is used for arranging the cover layer, the storage layer and the bottom layer respectively.
3. The test device for simulating mine water reinjection according to claim 2, wherein a plurality of openings are formed in a side surface of the reinjection tank, and the plurality of openings are respectively arranged corresponding to the plurality of supporting members so as to pull out the supporting members and any one of the cover layer, the storage layer and the bottom layer arranged on the supporting members out of the reinjection tank.
4. The test device for simulating mine water reinjection according to claim 2, wherein the top surface of the reinjection tank is detachably connected with the reinjection tank so as to replace the cover layer, the storage layer or the bottom layer.
5. The test device for simulating mine water reinjection according to claim 1, wherein the water pumping assembly comprises:
a water tank;
one end of the water pumping pipe is connected with the second end of the reinjection well, and the other end of the water pumping pipe is connected with the water tank;
and the water suction pump is connected with the water suction pipe.
6. A method for testing by using the test device for simulating mine water reinjection of any one of claims 1 to 5, which is characterized by comprising the following steps:
proportionally setting a test device according to formation information, wherein the test device comprises the reinjection box, the reinjection well and the water pumping assembly;
and injecting water back into the reinjection tank through the water pumping assembly, and predicting reinjection pressure and reinjection amount.
7. The testing method of claim 6, wherein the step of scaling the testing device according to formation information further comprises:
acquiring the stratum information, wherein the stratum information comprises: lithology, porosity, permeability coefficient, and water retention coefficient of the cap layer, the reservoir layer, and the base layer.
8. The testing method of claim 6, wherein the step of scaling the testing device according to formation information further comprises:
selecting a scaling, wherein the scaling is one tenth to one hundredth.
9. The test method of claim 6, wherein the step of refilling water into the refill tank through the pumping assembly and predicting refill pressure and refill amount further comprises:
and recording corresponding reinjection time at different reinjection speeds, determining a linear equation, and calculating reinjection pressure according to the linear equation.
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WO2018215764A1 (en) * | 2017-05-24 | 2018-11-29 | Geomec Engineering Limited | Improvements in or relating to injection wells |
CN110749703A (en) * | 2019-11-05 | 2020-02-04 | 山东省地勘局第二水文地质工程地质大队(山东省鲁北地质工程勘察院) | Method for simulating sandstone thermal storage geothermal tail water recharge and tracing experiment |
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CN103487563A (en) * | 2013-07-12 | 2014-01-01 | 华北水利水电大学 | Testing apparatus used for simulating foundation pit three-dimensional seepage caused by combined effects of separating-lowering-pouring and ground deformation mechanism |
CN104897877A (en) * | 2015-06-12 | 2015-09-09 | 济南轨道交通集团有限公司 | Indoor reinjection model test system simulating confined water stratum and control method of indoor reinjection model test system |
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