CN116641686A - Directional well forming method for in-situ leaching well site - Google Patents
Directional well forming method for in-situ leaching well site Download PDFInfo
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- 238000002386 leaching Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 214
- 239000007924 injection Substances 0.000 claims abstract description 214
- 239000007788 liquid Substances 0.000 claims abstract description 164
- 238000004519 manufacturing process Methods 0.000 claims abstract description 97
- 238000005086 pumping Methods 0.000 claims abstract description 48
- 238000005520 cutting process Methods 0.000 claims abstract description 37
- 238000000605 extraction Methods 0.000 claims abstract description 14
- 230000015572 biosynthetic process Effects 0.000 claims description 15
- 239000011148 porous material Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 abstract description 13
- 238000005065 mining Methods 0.000 abstract description 13
- 229910052770 Uranium Inorganic materials 0.000 abstract description 4
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000007865 diluting Methods 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000003911 water pollution Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/18—Drilling by liquid or gas jets, with or without entrained pellets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The application provides an on-site well-dipping site directional well forming method, which relates to the technical field of sandstone uranium mining and comprises at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angles and at least one liquid extraction well positioned in the middle; establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis; connecting a liquid injection well to be cut with a liquid pumping well in an injection and production unit to which the liquid injection well to be cut belongs; determining an opening direction and an opening angle according to the connecting line, the transverse shaft or the vertical shaft, and directionally cutting the liquid injection well to be cut according to the opening direction and the opening angle to form an edge hole; the application carries out directional transformation liquid injection on the in-situ leaching area well, realizes the directional injection of leaching liquid by controlling the opening direction of a mineral layer filter of a well drilling, further realizes the control of the leaching range of the mining area on the premise of not diluting the concentration of the leaching liquid, avoids the occurrence of underground water pollution, simultaneously can directionally remove the blockage of an old well, improves a seepage field and reduces leaching dead angles.
Description
Technical Field
The application relates to the technical field of sandstone uranium mining, in particular to a directional well forming method for an in-situ leaching well site.
Background
In the on-site leaching uranium mining standardization suggestion of a new mining area, the edge drilling of the whole on-site leaching area needs to be guaranteed to be a liquid pumping well, but if the edge drilling is all the liquid pumping well, a large amount of non-mineral layer groundwater can be pumped to a liquid collecting pool by the edge drilling, so that the metal concentration of surface leaching liquid is reduced, the total amount of leaching liquid required to be lifted and treated for obtaining the target leaching with the same quality is greatly increased, not only is the energy consumption increased, but also the workload and the reagent consumption of a subsequent treatment process are increased, so that the problem of designing the edge drilling of the mining area into the liquid injection well is a technical problem which is needed urgently in ensuring that uncontrollable pollution is not caused to the groundwater. In the old mining area, the ground is generally faced with stratum blockage after a period of production in the in-situ leaching mine, so how to solve the problem of blockage of drilling holes of the production process and nearby well zones and improve the seepage coverage of reservoirs becomes an important problem for improving the production efficiency.
Disclosure of Invention
The application aims to provide an on-site immersed well site oriented well forming method so as to solve the problems. In order to achieve the above purpose, the technical scheme adopted by the application is as follows:
the application provides an on-site immersed well site directional well forming method, when the on-site immersed well site is a new production area, the on-site immersed well site directional well forming method comprises at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angles and at least one liquid pumping well positioned in the middle;
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
connecting a liquid injection well to be cut with a liquid pumping well in an injection and production unit to which the liquid injection well to be cut belongs;
and determining the opening direction and the opening angle according to the connecting line, the transverse shaft or the vertical shaft, and directionally cutting the liquid injection well to be cut according to the opening direction and the opening angle to form an edge hole.
Further, if the liquid injection well to be cut belongs to the top angle of one injection and production unit, a liquid pumping well is arranged in the injection and production unit:
connecting a liquid injection well to be cut with the liquid pumping well;
acquiring an included angle between the connecting line and the transverse axis and between the connecting line and the vertical axis, taking the degree of the smaller included angle as a preset degree, and taking the value twice the preset degree as the opening degree;
and taking the connecting line as an angular bisector, and performing directional cutting on the liquid injection well to be cut according to the opening degree to form an edge hole.
Further, if the liquid injection well to be cut belongs to the top angle of one injection and production unit, a liquid pumping well is arranged in the injection and production unit:
connecting the liquid injection well to be cut with two liquid pumping wells positioned at the edge respectively;
after the two connecting lines are respectively extended outwards by 25 degrees, judging whether a transverse shaft or a vertical shaft extends out;
if not, performing directional cutting on the liquid injection well to be cut according to the angle of the two expanded connecting lines as the opening degree to form an edge hole;
otherwise, cutting the edge hole of 90 degrees of the liquid injection well to be cut in the range of the injection and production unit.
Further, if the liquid injection well to be cut belongs to the top angles of the plurality of injection and production units, a liquid pumping well is respectively arranged in the plurality of injection and production units:
respectively establishing rectangular coordinate systems in the injection and production units by taking the injection well to be cut as an origin;
connecting the liquid injection well to be cut with all liquid pumping wells respectively;
acquiring an included angle between each connecting line and a transverse axis and a vertical axis of a rectangular coordinate system, taking the degree of the smaller included angle as a preset degree, and taking a value twice the preset degree as an opening degree;
and sequentially cutting corresponding opening degrees in a rectangular coordinate system to which the liquid injection well to be cut belongs by taking each connecting line as an angular bisector to form an edge hole.
Further, if the liquid injection well to be cut belongs to the top angles of the plurality of injection and production units, a plurality of liquid extraction wells are respectively arranged in the plurality of injection and production units;
respectively taking a liquid injection well to be cut as an origin, and establishing a rectangular coordinate system in the injection and production unit;
and respectively cutting 90 degrees in a rectangular coordinate system to which the liquid injection well to be cut belongs to form edge holes.
Further, the pore density of the edge pores in the longitudinal direction is 12-18 pores/meter.
Further, the edge holes have a hole depth greater than 0.2 meters.
On the other hand, the application also provides an on-site immersed well site directional well forming method, wherein the on-site immersed well site is an old production area and comprises at least one injection and production unit, and the injection and production unit consists of four injection wells positioned at the top angle, one liquid extraction well positioned in the middle and at least one leaching dead angle;
taking a liquid injection well positioned at one side of a leaching dead angle as a liquid injection well to be cut;
determining a central point of a leaching dead angle;
connecting the to-be-cut liquid injection well and the liquid extraction well with the central point respectively;
and respectively and directionally cutting the holes of the liquid injection well and the liquid suction well to be cut by taking the direction of the connecting line as the direction of the holes and taking the connecting line as an angular bisector.
Further, the method comprises the steps of:
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
acquiring an included angle between a first connecting line and a transverse shaft and a vertical shaft, taking the degree of the smaller included angle as a preset degree, and taking twice of the preset degree as an opening degree, wherein the first connecting line is the continuity between a liquid injection well to be cut and a central point;
and taking the first connecting line as an angular bisector, and performing directional cutting on the liquid injection well to be cut according to the opening degree to form an edge hole.
Further, the method further comprises the following steps:
acquiring a second connecting line, wherein the second connecting line is a connecting line of the liquid pumping well and the central point;
and taking the second connecting line as an angular bisector, and forming an edge hole with the size of 90 degrees on the liquid pumping well.
The beneficial effects of the application are as follows:
aiming at a new production area, the method and the device of the application precisely control the direction of the seepage channel of the liquid injection well by combining the actual situation of the production area through the technology of hydraulic slotting or directional perforation, realize the directional injection of leaching liquid by controlling the opening direction of a mineral layer filter of a well drilling, and improve the metal concentration of the leaching liquid as much as possible, reduce the energy consumption of the replacement leaching liquid and the cost of subsequent treatment and improve the technical economy of an in-situ leaching mine on the premise of precisely controlling the leaching range and reducing pollution.
The method is characterized in that the in-situ leaching drilling is modified into directional liquid injection drilling (or liquid extraction drilling) aiming at an old mining area, and the directional modification is carried out on the blocking problem of the drilling in the edge well or the production mining area through the directional liquid injection of the drilling, so that the effective control of leaching coverage reconstruction and leaching liquid out-diffusion is realized.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of directional cutting of the edge holes of the newly produced area disclosed in this example 1.
FIG. 2 is a schematic illustration of the range of solution permeation flow of FIG. 1.
Fig. 3 is a perspective view of different directional cutting angles.
Fig. 4 is a top view of a different directional cut angle.
Fig. 5 is a schematic diagram of directional cutting of the edge holes of the newly produced area disclosed in this example 2.
Fig. 6 is a schematic diagram of directional cutting of the edge holes in the newly produced area as disclosed in example 3.
Fig. 7 is a schematic view of the directional cutting of the edge holes of the old mining area disclosed in this example 4.
Fig. 8 is a graph comparing the effects of the old mining area disclosed in example 5 before and after directional cutting of the edge hole.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Example 1
The embodiment provides an on-site immersed well site directional well forming method, when the on-site immersed well site is a new production area, the on-site immersed well site directional well forming method comprises at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angles and at least one liquid pumping well positioned in the middle;
as shown in fig. 1, the drawing comprises 4 square injection and production units, each injection and production unit comprises a liquid pumping well, and the liquid pumping well is positioned in the center of the injection and production unit;
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
connecting a liquid injection well to be cut with a liquid pumping well in an injection and production unit to which the liquid injection well to be cut belongs;
and determining the opening direction and the opening angle according to the connecting line, the transverse shaft or the vertical shaft, and directionally cutting the liquid injection well to be cut according to the opening direction and the opening angle to form an edge hole.
Before the development of the in-situ leaching uranium, the pressure distribution in the stratum is in an original state, and the stratum pressure at the moment is the original stratum pressure. When the production activity is carried out, the average pressure of the whole stratum is kept unchanged basically under the condition that the injection and production liquid quantity of the whole mining area is basically the same. From the basic knowledge of the percolation force, it is known that the pressure field is redistributed in the formation while the average pressure of the formation remains the same, and the variation of the pressure field is consistent with the variation of the percolation field. For an injection well, the formation pressure around the injection well is higher than the average formation pressure because a large amount of fluid is injected into the formation from the injection well; in contrast, the formation pressure around the production well is lower than the original formation pressure. The direction with the largest pressure gradient in the stratum is the connecting line direction of the injection well and the production well. Regardless of the apparent permeability heterogeneity surrounding the injection well, for conventional well completion, fluid may be injected relatively uniformly into the formation surrounding the injection well, with substantially the same formation pressure surrounding the injection well. Therefore, on the premise of ensuring the same injection quantity as the conventional well-forming mode, the directional injection mode is characterized in that the fluid is injected into the stratum from a certain direction at a certain angle, and the stratum pressure around the injection well along the injection direction is higher. If the direction is exactly the connection direction of the injection well and the unit pumping well where the injection well is located, a higher pressure gradient exists along the direction, so that more fluid flows to the pumping well along the direction under the action of the higher pressure gradient, and the influence of the fluid in the non-injection direction is reduced.
To further optimize the hole opening, the method further comprises the following steps:
if the liquid injection well to be cut belongs to the top angle of one injection and production unit, a liquid pumping well is arranged in the injection and production unit:
connecting a liquid injection well to be cut with the liquid pumping well;
acquiring an included angle between the connecting line and the transverse axis and between the connecting line and the vertical axis, taking the degree of the smaller included angle as a preset degree, and taking the value twice the preset degree as the opening degree;
and taking the connecting line as an angular bisector, and performing directional cutting on the liquid injection well to be cut according to the opening degree to form an edge hole.
Or alternatively
If the liquid injection well to be cut belongs to the top angles of the plurality of injection and production units, a liquid pumping well is arranged in each of the plurality of injection and production units:
respectively establishing rectangular coordinate systems in the injection and production units by taking the injection well to be cut as an origin;
connecting the liquid injection well to be cut with all liquid pumping wells respectively;
acquiring an included angle between each connecting line and a transverse axis and a vertical axis of a rectangular coordinate system, taking the degree of the smaller included angle as a preset degree, and taking a value twice the preset degree as an opening degree;
and sequentially cutting corresponding opening degrees in a rectangular coordinate system to which the liquid injection well to be cut belongs by taking each connecting line as an angular bisector to form an edge hole.
Referring to fig. 1, since the liquid pumping well is located at the center of the injection unit, the minimum included angle between the connecting line and the edge line of the injection unit is 45 °, and 90 edge holes are required to be formed in the direction of the connecting line of the liquid pumping well; specifically, the liquid injection wells numbered 1, 2, 3 and 4 belong to the top angles of one injection unit, so that 90-degree edge holes are required to be formed; the liquid injection wells with the numbers of 5, 6, 7 and 8 belong to the top angles of two injection and production units, so that 180-degree edge holes are required to be formed; the liquid injection well with the number of 9 belongs to the top angles of four injection and production units, so that 360-degree edge holes are required to be formed.
By forming the edge hole on the liquid injection well, the solution seepage range of the edge drilling well can be effectively controlled, and the solution seepage range is shown in figure 2.
Preferably, the directional perforation can adopt two modes of hydraulic cutting windowing or directional perforation, and edge holes with different cutting angles are shown in fig. 3 and 4.
Preferably, the hole density of the edge holes in the longitudinal direction is 12-18 holes/m, and the hole depth of the edge holes is more than 0.2 m.
Example 2
The embodiment provides an on-site immersed well site directional well forming method, when the on-site immersed well site is a new production area, the on-site immersed well site directional well forming method comprises at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angles and at least one liquid pumping well positioned in the middle;
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
connecting a liquid injection well to be cut with a liquid pumping well in an injection and production unit to which the liquid injection well to be cut belongs;
and determining the opening direction and the opening angle according to the connecting line, the transverse shaft or the vertical shaft, and directionally cutting the liquid injection well to be cut according to the opening direction and the opening angle to form an edge hole.
Based on the above embodiment, further, if the liquid injection well to be cut belongs to the top corner of one injection and production unit, a liquid pumping well is arranged in the injection and production unit:
connecting the liquid injection well to be cut with two liquid pumping wells positioned at the edge respectively;
after the two connecting lines are respectively extended outwards by 25 degrees, judging whether a transverse shaft or a vertical shaft extends out;
if not, performing directional cutting on the liquid injection well to be cut according to the angle of the two expanded connecting lines as the opening degree to form an edge hole;
otherwise, cutting the edge hole of 90 degrees of the liquid injection well to be cut in the range of the injection and production unit.
Specifically, as shown in fig. 5, a liquid pumping well is arranged in the middle of the injection and production unit in the figure, taking the No. 1 injection well as an example, connecting the injection well with the two liquid pumping wells to obtain the minimum included angles of the two connecting lines and the edge line of the injection and production unit respectively being 20 degrees and 45 degrees, and respectively expanding the two connecting lines outwards by 25 degrees, but as the edge line of the injection and production unit is used as one edge of the cutting and is used as the opening degree of the edge hole after the edge line of the injection and production unit is outwards expanded by 25 degrees with the other connecting line.
Example 3
The embodiment provides an on-site immersed well site directional well forming method, when the on-site immersed well site is a new production area, the on-site immersed well site directional well forming method comprises at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angles and at least one liquid pumping well positioned in the middle;
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
connecting a liquid injection well to be cut with a liquid pumping well in an injection and production unit to which the liquid injection well to be cut belongs;
and determining the opening direction and the opening angle according to the connecting line, the transverse shaft or the vertical shaft, and directionally cutting the liquid injection well to be cut according to the opening direction and the opening angle to form an edge hole.
Based on the above embodiments, if the to-be-cut injection well belongs to the top angles of the plurality of injection and production units, and a plurality of liquid pumping wells are respectively arranged in the plurality of injection and production units;
respectively taking a liquid injection well to be cut as an origin, and establishing a rectangular coordinate system in the injection and production unit;
and respectively cutting 90 degrees in a rectangular coordinate system to which the liquid injection well to be cut belongs to form edge holes.
Specifically, as shown in fig. 6, the liquid injection wells 3 and 6 belong to two injection and production units, and two liquid extraction wells are arranged in two main material units, so that the liquid injection wells 3 and 6 are provided with 90-degree edge holes in the two injection and production units, and 180-degree edge holes are required to be formed.
Example 4
The application also provides a method for directional well formation of the in-situ leaching well site, which is an old production area and comprises at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angle, one liquid pumping well positioned in the middle and at least one leaching dead angle;
taking a liquid injection well positioned at one side of a leaching dead angle as a liquid injection well to be cut;
determining the center point of the leaching dead angle of the injection and production unit;
connecting the to-be-cut liquid injection well and the liquid extraction well with the central point respectively;
and respectively and directionally cutting the holes of the liquid injection well and the liquid suction well to be cut by taking the direction of the connecting line as the direction of the holes and taking the connecting line as an angular bisector.
Based on the above embodiment, further comprising:
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
acquiring an included angle between a first connecting line and a transverse shaft and a vertical shaft, taking the degree of the smaller included angle as a preset degree, and taking twice of the preset degree as an opening degree, wherein the first connecting line is the continuity between a liquid injection well to be cut and a central point;
and taking the first connecting line as an angular bisector, and performing directional cutting on the liquid injection well to be cut according to the opening degree to form an edge hole.
Based on the above embodiment, further comprising:
acquiring a minimum included angle between a second connecting line and an edge line of the injection and production unit, wherein the second connecting line is a connecting line of the liquid pumping well and the central point;
acquiring a second connecting line, wherein the second connecting line is a connecting line of the liquid pumping well and the central point;
and taking the second connecting line as an angular bisector, and forming an edge hole with the size of 90 degrees on the liquid pumping well.
Specifically, as shown in fig. 7, after the well site runs for a period of time, leaching dead angles of (14), (15), (16), (17), (18) and the like are respectively found at different mining areas, and the near-wellbore zone is blocked due to long-time liquid pumping and injection.
Taking a leaching dead angle (14) as an example, taking liquid injection wells 1 and 2 positioned at one side of the leaching dead angle as liquid injection wells to be cut, respectively connecting liquid extraction wells 7 in the liquid injection wells to be cut and the liquid injection and extraction units with the central point, respectively cutting the liquid injection wells to be cut and the liquid extraction wells to be cut with the direction of the connecting line as an opening direction and the connecting line as an angular bisector, and changing the form of an underground flow field by adjusting the directional seepage directions of the wells 1, 2 and 3 so as to leach out part of metal.
Similarly, the leaching dead angle areas (15), 16 and 17) can be reconstructed through directional seepage reconstruction of surrounding wells, so that the reconstruction of the underground seepage field is realized, and the leaching efficiency of the unit is improved.
Example 5
As shown in fig. 8, the present embodiment uses numerical simulation software to create a "4-shot-9-shot" old production area, and as can be seen from fig. (a), more blue leaching dead-corner areas are formed after a period of production due to the anisotropy of the underground permeability. Figure (b) is after modification by directional perforation. After a period of time, the leaching dead angle of the whole area is obviously reduced as can be seen from the schematic diagram of the leaching dead angle. The area of the leaching dead angle area before and after the transformation is counted, the whole transformation can reduce the leaching dead angle by nearly 70%, the recovery rate of unit resources is obviously improved, and the effect is obvious.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. The method is characterized by comprising at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angle and at least one liquid extraction well positioned in the middle;
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
connecting a liquid injection well to be cut with a liquid pumping well in an injection and production unit to which the liquid injection well to be cut belongs;
and determining the opening direction and the opening angle according to the connecting line, the transverse shaft or the vertical shaft, and directionally cutting the liquid injection well to be cut according to the opening direction and the opening angle to form an edge hole.
2. The method for directional well formation at an in-situ leaching well site according to claim 1, wherein if the injection well to be cut belongs to a top corner of an injection and production unit, an extraction well is arranged in the injection and production unit:
connecting a liquid injection well to be cut with the liquid pumping well;
acquiring an included angle between the connecting line and the transverse axis and between the connecting line and the vertical axis, taking the degree of the smaller included angle as a preset degree, and taking the value twice the preset degree as the opening degree;
and taking the connecting line as an angular bisector, and performing directional cutting on the liquid injection well to be cut according to the opening degree to form an edge hole.
3. The method for directional well formation at an in-situ leaching well site according to claim 1, wherein if the injection well to be cut belongs to a top corner of an injection and production unit, an extraction well is arranged in the injection and production unit:
connecting the liquid injection well to be cut with two liquid pumping wells positioned at the edge respectively;
after the two connecting lines are respectively extended outwards by 25 degrees, judging whether a transverse shaft or a vertical shaft extends out;
if not, performing directional cutting on the liquid injection well to be cut according to the angle of the two expanded connecting lines as the opening degree to form an edge hole;
otherwise, cutting the edge hole of 90 degrees of the liquid injection well to be cut in the range of the injection and production unit.
4. The method for directional well formation at an in-situ leaching well site according to claim 1, wherein if the injection well to be cut belongs to the top corners of a plurality of injection and production units, one pumping well is respectively arranged in the plurality of injection and production units:
respectively establishing rectangular coordinate systems in the injection and production units by taking the injection well to be cut as an origin;
connecting the liquid injection well to be cut with all liquid pumping wells respectively;
acquiring an included angle between each connecting line and a transverse axis and a vertical axis of a rectangular coordinate system, taking the degree of the smaller included angle as a preset degree, and taking a value twice the preset degree as an opening degree;
and sequentially cutting corresponding opening degrees in a rectangular coordinate system to which the liquid injection well to be cut belongs by taking each connecting line as an angular bisector to form an edge hole.
5. The method for directional well formation at an in-situ leaching well site according to claim 1, wherein if the injection well to be cut belongs to the top corners of a plurality of injection and production units, a plurality of liquid pumping wells are respectively arranged in the plurality of injection and production units;
respectively taking a liquid injection well to be cut as an origin, and establishing a rectangular coordinate system in the injection and production unit;
and respectively cutting 90 degrees in a rectangular coordinate system to which the liquid injection well to be cut belongs to form edge holes.
6. The method for directional well formation at an in-situ leaching well site according to claim 1, wherein: the pore density of the edge pores in the longitudinal direction is 12-18 pores/m.
7. The in situ leaching wellsite directed well forming method of claim 1, wherein the edge hole has a hole depth greater than 0.2 meters.
8. The method is characterized by comprising at least one injection and production unit, wherein the injection and production unit consists of four injection wells positioned at the top angle, one liquid pumping well positioned in the middle and at least one leaching dead angle;
taking a liquid injection well positioned at one side of a leaching dead angle as a liquid injection well to be cut;
determining a central point of a leaching dead angle;
connecting the to-be-cut liquid injection well and the liquid extraction well with the central point respectively;
and respectively and directionally cutting the holes of the liquid injection well and the liquid suction well to be cut by taking the direction of the connecting line as the direction of the holes and taking the connecting line as an angular bisector.
9. The in situ leaching wellsite directed well forming method of claim 8, comprising:
establishing a rectangular coordinate system by taking a to-be-cut liquid injection well as an origin and an edge line of an injection and production unit as a transverse axis and a vertical axis;
acquiring an included angle between a first connecting line and a transverse shaft and a vertical shaft, taking the degree of the smaller included angle as a preset degree, and taking twice of the preset degree as an opening degree, wherein the first connecting line is the continuity between a liquid injection well to be cut and a central point;
and taking the first connecting line as an angular bisector, and performing directional cutting on the liquid injection well to be cut according to the opening degree to form an edge hole.
10. The in situ leaching wellsite directed well forming method of claim 8, further comprising:
acquiring a second connecting line, wherein the second connecting line is a connecting line of the liquid pumping well and the central point;
and taking the second connecting line as an angular bisector, and forming an edge hole with the size of 90 degrees on the liquid pumping well.
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|---|---|---|---|
| CN202310828688.1A CN116641686A (en) | 2023-07-07 | 2023-07-07 | Directional well forming method for in-situ leaching well site |
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| CN202310828688.1A CN116641686A (en) | 2023-07-07 | 2023-07-07 | Directional well forming method for in-situ leaching well site |
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