Directional well drilling method for in-situ immersion well field

Abstract

The invention provides a directional well formation method for an in-situ leaching well field, and relates to the technical field of sandstone uranium mining, and comprises at least one injection and production unit, wherein the injection and production unit is composed of four injection wells located at the top corners and at least one extraction well located in the middle; a rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal axis and the vertical axis; the injection well to be cut and the extraction well in the injection and production unit to which it belongs are connected; the hole opening direction and the hole opening angle are determined according to the connection line, the horizontal axis or the vertical axis, and the injection well to be cut is directionally cut according to the hole opening direction and the hole opening angle to form an edge hole; the invention performs directional transformation and injection on the wells in the in-situ leaching mining area, and realizes directional injection of the leaching solution by controlling the opening direction of the ore layer filter of the drilling well, thereby realizing the control of the leaching range of the mining area without diluting the concentration of the leaching solution, avoiding groundwater pollution, and at the same time, the blockage of the old well can be directionally relieved, the seepage field is improved, and the leaching dead angle is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sandstone uranium mining, and in particular to a directional well-forming method for an in-situ leaching well field. Background Art

[0002] In the recommended specifications for in-situ uranium leaching in new mining areas, it is necessary to ensure that the edge wells of the entire in-situ leaching mining area are pumping wells. However, if the edge wells are all pumping wells, a large amount of non-ore layer groundwater will be pumped out by the edge wells into the liquid collection pool, causing the metal concentration of the surface leachate to decrease. This leads to a significant increase in the total amount of leachate that needs to be lifted and processed to obtain the same quality of target leaching, which will not only increase energy consumption, but also increase the workload and reagent consumption of subsequent treatment processes. Therefore, how to design the edge wells of the mining area as injection wells while ensuring that there is no uncontrollable pollution to the groundwater is an urgent technical issue. In the old mining area, in-situ leaching mines generally face formation blockage after a period of production. Therefore, how to solve the blockage of the near-wellbore area of ​​the production process borehole and transform the reservoir seepage coverage has become an important issue to improve production efficiency. Summary of the invention

[0003] The purpose of the present invention is to provide a directional well drilling method for an in-situ well field to improve the above problems. In order to achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0004] The present application provides a directional well drilling method for an in-situ well field, when the in-situ well field is a new mining area, it includes at least one injection and production unit, and the injection and production unit is composed of four injection wells located at the top corners and at least one pumping well located in the middle;

[0005] A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes;

[0006] Connect the injection well to be cut and the extraction well in the injection and production unit to which it belongs;

[0007] The hole opening direction and hole opening angle are determined according to the connecting line, the horizontal axis or the vertical axis, and the injection well to be cut is directionally cut according to the hole opening direction and the hole opening angle to form an edge hole.

[0008] Furthermore, if the injection well to be cut belongs to the top corner of an injection-production unit, and a pumping well is provided in the injection-production unit:

[0009] Connecting the injection well to be cut with the pumping well;

[0010] Obtain the angles between the connecting line and the horizontal axis and the vertical axis, take the smaller angle as the preset degree, and take twice the preset degree as the opening degree;

[0011] Taking the connecting line as the angle bisector, directional cutting is performed on the injection well to be cut according to the opening degree to form an edge hole.

[0012] Furthermore, if the injection well to be cut belongs to the top corner of an injection-production unit, and two extraction wells are set in the injection-production unit:

[0013] Connect the injection well to be cut with two extraction wells located at the edge respectively;

[0014] Extend the two connecting lines outward by 25° respectively and determine whether they extend out of the horizontal axis or the vertical axis;

[0015] If not, the injection well to be cut is cut directionally to form an edge hole according to the angle of the two extended connecting lines as the hole opening degree;

[0016] Otherwise, a 90° edge hole is cut for the injection well to be cut within the range of the injection-production unit.

[0017] Furthermore, if the injection well to be cut belongs to the vertex of multiple injection and production units, and each of the multiple injection and production units is provided with a pumping well:

[0018] Taking the injection well to be cut as the origin, a rectangular coordinate system is established in each injection and production unit;

[0019] Connect the injection wells to be cut with all the pumping wells respectively;

[0020] Obtain the angles between each connecting line and the horizontal axis and the vertical axis of the rectangular coordinate system, take the degree of the smaller angle as the preset degree, and take twice the value of the preset degree as the opening degree;

[0021] Taking each connecting line as an angle bisector, corresponding opening degrees are cut in the rectangular coordinate system to which the injection well to be cut belongs to form edge holes.

[0022] Further, if the injection well to be cut belongs to the vertex of multiple injection and production units, and multiple pumping wells are respectively arranged in the multiple injection and production units;

[0023] Taking the injection well to be cut as the origin, a rectangular coordinate system is established in the injection and production unit to which it belongs;

[0024] Then, edge holes are formed by cutting 90° in the rectangular coordinate system to which the injection well to be cut belongs.

[0025] Furthermore, the edge holes have a hole density of 12-18 holes / meter in the longitudinal direction.

[0026] Furthermore, the hole depth of the edge hole is greater than 0.2 meters.

[0027] On the other hand, the present application also provides a directional well drilling method for an in-situ leaching well field, wherein the in-situ leaching well field is an old mining area, and includes at least one injection and production unit, wherein the injection and production unit is composed of four injection wells located at the top corners, a pumping well located in the middle, and at least one leaching dead corner;

[0028] The injection well located on the side of the leaching dead corner is used as the injection well to be cut;

[0029] Determine the center point of the leaching dead corner;

[0030] Connect the injection well and the pumping well to be cut to the central point respectively;

[0031] The direction of the connecting line is taken as the hole opening direction, and the connecting line is taken as the angle bisector to directional cut and open holes for the injection well and the pumping well to be cut.

[0032] Further, including:

[0033] A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes;

[0034] Obtaining the angles between the first connecting line and the horizontal axis and the vertical axis, taking the degree of the smaller angle as the preset degree, and taking twice the preset degree as the opening degree, wherein the first connecting line is the line connecting the injection well to be cut and the center point;

[0035] Taking the first connecting line as the angle bisector, directional cutting is performed on the injection well to be cut according to the opening degree to form an edge hole.

[0036] Furthermore, it also includes:

[0037] Obtaining a second connecting line, where the second connecting line is a connecting line between the pumping well and the center point;

[0038] With the second connecting line as the angle bisector, a 90° edge hole is opened on the pumping well.

[0039] The beneficial effects of the present invention are:

[0040] For new mining areas, the present invention uses hydraulic cutting or directional perforation technology, combined with the actual situation of the mining area, to accurately control the direction of the seepage channel of the injection well, and realizes directional injection of the leaching solution by controlling the opening direction of the ore layer filter of the drilling well. Under the premise of accurately controlling the leaching range and reducing pollution, the metal concentration of the leaching solution is increased as much as possible, the energy consumption of the substitute leaching solution and the cost of subsequent treatment are reduced, and the technical and economic benefits of the in-situ leaching mine are improved.

[0041] For old mining areas, in-situ leaching drilling is transformed into directional injection drilling (or pumping drilling). Through directional injection of drilling, the blockage problem of marginal wells or boreholes inside the production area is directionally transformed to achieve reconstruction of the leaching coverage and effective control of the external diffusion of the leaching liquid.

[0042] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or be understood by implementing the embodiments of the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 This is a schematic diagram of directional cutting of edge holes in the new mining area disclosed in Example 1.

[0045] Figure 2 for Figure 1 Schematic diagram of the solution seepage range.

[0046] Figure 3 It is a three-dimensional schematic diagram of different directional cutting angles.

[0047] Figure 4 Top view of different directional cutting angles.

[0048] Figure 5 This is a schematic diagram of the directional cutting of the edge holes in the new mining area disclosed in Example 2.

[0049] Figure 6 This is a schematic diagram of the directional cutting of the edge holes in the new mining area disclosed in Example 3.

[0050] Figure 7 This is a schematic diagram of the directional cutting of the edge holes in the old mining area disclosed in Example 4.

[0051] Figure 8 This is a comparison diagram of the effects before and after directional cutting of the edge holes in the old mining area disclosed in Example 5. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0054] Example 1

[0055] This embodiment provides a directional well drilling method for an in-situ well field, when the in-situ well field is a new mining area, comprising at least one injection and production unit, the injection and production unit consisting of four injection wells located at the top corners and at least one extraction well located in the middle;

[0056] like Figure 1 As shown, the figure includes 4 square injection and production units, each of which includes a pumping well, and the pumping well is located at the center of the injection and production unit;

[0057] A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes;

[0058] Connect the injection well to be cut and the extraction well in the injection and production unit to which it belongs;

[0059] The hole opening direction and hole opening angle are determined according to the connecting line, the horizontal axis or the vertical axis, and the injection well to be cut is directionally cut according to the hole opening direction and the hole opening angle to form an edge hole.

[0060] Before the development of in situ leaching uranium mining, the pressure distribution in the formation is in its original state, and the formation pressure at this time is referred to as the original formation pressure. When production activities are carried out, the average pressure of the entire formation remains basically unchanged while ensuring that the amount of injection and production fluid in the entire mining area is basically the same. From the basic knowledge of seepage mechanics, it can be seen that although the average pressure of the formation remains unchanged, the pressure field will be redistributed in the formation, and the change in the pressure field is consistent with the change in the seepage field. For the injection well, since a large amount of fluid is injected into the formation from the injection well, the formation pressure around the injection well is higher than the average formation pressure; relatively speaking, the formation pressure around the production well is lower than the original formation pressure. The direction with the largest pressure gradient in the formation is the direction of the line connecting the injection well and the production well. Without considering the obvious permeability heterogeneity around the injection well, for conventional completion methods, the fluid will be relatively evenly injected into the formation around the injection well, and the formation pressure around the injection well is basically the same. Therefore, under the premise of ensuring the same injection volume as conventional well drilling methods, the directional injection method will have a higher formation pressure around the injection well along the injection direction because the fluid is injected into the formation from a certain direction at a certain angle. If this direction happens to be the direction of the line connecting the injection well and the pumping well in its unit, there will be a higher pressure gradient along this direction, so more fluid will flow to the pumping well along this direction under the action of the higher pressure gradient, thereby reducing the impact of the fluid in the non-injection direction.

[0061] To further optimize the opening, it also includes:

[0062] If the injection well to be cut belongs to the top corner of an injection-production unit, and there is a pumping well in the injection-production unit:

[0063] Connecting the injection well to be cut with the pumping well;

[0064] Obtain the angles between the connecting line and the horizontal axis and the vertical axis, take the smaller angle as the preset degree, and take twice the preset degree as the opening degree;

[0065] Taking the connecting line as the angle bisector, directional cutting is performed on the injection well to be cut according to the opening degree to form an edge hole.

[0066] or

[0067] If the injection well to be cut belongs to the top corner of multiple injection and production units, and each of the multiple injection and production units is provided with a pumping well:

[0068] Taking the injection well to be cut as the origin, a rectangular coordinate system is established in each injection and production unit;

[0069] Connect the injection wells to be cut with all the pumping wells respectively;

[0070] Obtain the angles between each connecting line and the horizontal axis and the vertical axis of the rectangular coordinate system, take the degree of the smaller angle as the preset degree, and take twice the value of the preset degree as the opening degree;

[0071] Taking each connecting line as an angle bisector, corresponding opening degrees are cut in the rectangular coordinate system to which the injection well to be cut belongs to form edge holes.

[0072] See also Figure 1 Since the pumping well is located at the center of the injection and production unit, the minimum angle between the connecting line and the edge line of the injection and production unit is 45°, and a 90° edge hole needs to be opened in the direction of the injection well connecting line; specifically, the injection wells numbered 1, 2, 3, and 4 all belong to the top angle of one injection and production unit, so a 90° edge hole needs to be opened; the injection wells numbered 5, 6, 7, and 8 all belong to the top angle of two injection and production units, so a 180° edge hole needs to be opened; the injection well numbered 9 belongs to the top angle of four injection and production units, so a 360° edge hole needs to be opened.

[0073] By opening edge holes in the injection well, the solution seepage range of the edge drilling can be effectively controlled. Figure 2 shown.

[0074] Preferably, the directional opening can be performed by hydraulic cutting window opening or directional perforation. The edge holes with different cutting angles are as follows: Figure 3 , Figure 4 shown.

[0075] Preferably, the edge holes have a hole density of 12-18 holes / m in the longitudinal direction, and the hole depth of the edge holes is greater than 0.2 m.

[0076] Example 2

[0077] This embodiment provides a directional well drilling method for an in-situ well field, when the in-situ well field is a new mining area, comprising at least one injection and production unit, the injection and production unit consisting of four injection wells located at the top corners and at least one extraction well located in the middle;

[0078] A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes;

[0079] Connect the injection well to be cut and the extraction well in the injection and production unit to which it belongs;

[0080] The hole opening direction and hole opening angle are determined according to the connecting line, the horizontal axis or the vertical axis, and the injection well to be cut is directionally cut according to the hole opening direction and the hole opening angle to form an edge hole.

[0081] Based on the above embodiment, further, if the injection well to be cut belongs to the vertex of an injection-production unit, and two pumping wells are provided in the injection-production unit:

[0082] Connect the injection well to be cut with two extraction wells located at the edge respectively;

[0083] Extend the two connecting lines outward by 25° respectively and determine whether they extend out of the horizontal axis or the vertical axis;

[0084] If not, the injection well to be cut is cut directionally to form an edge hole according to the angle of the two extended connecting lines as the hole opening degree;

[0085] Otherwise, a 90° edge hole is cut for the injection well to be cut within the range of the injection-production unit.

[0086] Specifically, Figure 5 As shown in the figure, there are two pumping wells in the middle of the injection and production unit. Taking injection well No. 1 as an example, the injection well and the two pumping wells are connected, and the minimum angles between the two connecting lines and the edge line of the injection and production unit are 20° and 45° respectively. The two connecting lines are extended outward by 25° respectively. However, since the angle of 20° is extended outward by 25°, the injection and production unit is extended outward. Therefore, the edge line of the injection and production unit is used as one of the cutting edges, and the other connecting line is extended outward by 25° as the opening degree of the edge hole.

[0087] Example 3

[0088] This embodiment provides a directional well drilling method for an in-situ well field, when the in-situ well field is a new mining area, comprising at least one injection and production unit, the injection and production unit consisting of four injection wells located at the top corners and at least one extraction well located in the middle;

[0089] A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes;

[0090] Connect the injection well to be cut and the extraction well in the injection and production unit to which it belongs;

[0091] The hole opening direction and hole opening angle are determined according to the connecting line, the horizontal axis or the vertical axis, and the injection well to be cut is directionally cut according to the hole opening direction and the hole opening angle to form an edge hole.

[0092] Based on the above embodiment, if the injection well to be cut belongs to the vertex of multiple injection and production units, and multiple pumping wells are respectively arranged in the multiple injection and production units;

[0093] Taking the injection well to be cut as the origin, a rectangular coordinate system is established in the injection and production unit to which it belongs;

[0094] Then, edge holes are formed by cutting 90° in the rectangular coordinate system to which the injection well to be cut belongs.

[0095] Specifically, Figure 6As shown, the injection wells 3 and 6 belong to two injection and production units, and two extraction wells are arranged in the two main material units. Therefore, the injection wells 3 and 6 need to have 90° edge holes in both injection and production units, and thus 180° edge holes need to be opened.

[0096] Example 4

[0097] The present application also provides a directional well drilling method for an in-situ leaching well field, wherein the in-situ leaching well field is an old mining area and includes at least one injection and production unit, wherein the injection and production unit is composed of four injection wells located at the top corners, a pumping well located in the middle, and at least one leaching dead corner;

[0098] The injection well located on the side of the leaching dead corner is used as the injection well to be cut;

[0099] Determine the center point of the injection-production unit and the leaching dead corner;

[0100] Connect the injection well and the pumping well to be cut to the central point respectively;

[0101] The direction of the connecting line is taken as the hole opening direction, and the connecting line is taken as the angle bisector to directional cut and open holes for the injection well and the pumping well to be cut.

[0102] Based on the above embodiment, it also includes:

[0103] A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes;

[0104] Obtaining the angles between the first connecting line and the horizontal axis and the vertical axis, taking the degree of the smaller angle as the preset degree, and taking twice the preset degree as the opening degree, wherein the first connecting line is the line connecting the injection well to be cut and the center point;

[0105] Taking the first connecting line as the angle bisector, directional cutting is performed on the injection well to be cut according to the opening degree to form an edge hole.

[0106] Based on the above embodiment, it also includes:

[0107] Obtaining the minimum angle between a second connecting line and the edge line of the injection-production unit, wherein the second connecting line is a connecting line between the pumping well and the center point;

[0108] Obtaining a second connecting line, where the second connecting line is a connecting line between the pumping well and the center point;

[0109] With the second connecting line as the angle bisector, a 90° edge hole is opened on the pumping well.

[0110] Specifically, Figure 7As shown, after the well site had been in operation for a period of time, leaching dead corners (14), (15), (16), (17), and (18) were found at different locations in the mining area, and the area near the wellbore had been blocked due to long-term pumping of fluid.

[0111] Taking (14) the leaching dead corner as an example, the injection wells 1 and 2 located on one side of the leaching dead corner are used as the injection wells to be cut, and the injection wells to be cut and the pumping well 7 in the injection-production unit are connected to the center point respectively. The direction of the connecting line is used as the opening direction, and the connecting line is used as the angle bisector to directionally cut the injection wells to be cut and the pumping wells to be cut. By adjusting the directional seepage direction of wells 1, 2, and 3, the shape of the underground flow field is changed, so that the part of the metal is leached.

[0112] Similarly, for the leaching dead corner areas (15), (16), and (17), the directional seepage transformation of the surrounding wells can be used to reconstruct the underground seepage field and improve the unit leaching efficiency.

[0113] Example 5

[0114] like Figure 8 As shown, this embodiment uses numerical simulation software to establish an old mining area of ​​"4 extractions-9 injections". It can be seen from Figure (a) that due to the anisotropy of underground permeability, more blue leaching dead corners are formed after a period of production. Figure (b) is after the transformation through directional perforation. A schematic diagram of the leaching dead corner after a period of time, it can be seen that the leaching dead corners in the entire area are significantly reduced. By counting the area of ​​the leaching dead corners before and after the transformation, it can be found that the entire transformation can reduce the leaching dead corners by nearly 70%, significantly improving the unit resource recovery rate, and the effect is remarkable.

[0115] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0116] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A directional well drilling method for an in-situ well field, when the in-situ well field is a new mining area, characterized in that: It comprises at least one injection and production unit, which is composed of four injection wells located at the top corners and at least one extraction well located in the middle; A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes; Connect the injection well to be cut and the extraction well in the injection and production unit to which it belongs; Determining the hole opening direction and hole opening angle according to the connecting line, the horizontal axis or the vertical axis, and directionally cutting the injection well to be cut to form an edge hole according to the hole opening direction and hole opening angle, including: If the injection well to be cut belongs to the top corner of an injection-production unit, and there is a pumping well in the injection-production unit: Connecting the injection well to be cut with the pumping well; Obtain the angles between the connecting line and the horizontal axis and the vertical axis, take the smaller angle as the preset degree, and take twice the preset degree as the opening degree; Taking the connecting line as the angle bisector, directional cutting is performed on the injection well to be cut according to the opening degree to form an edge hole.

2. The directional well drilling method for an in-situ well field according to claim 1, characterized in that: If the injection well to be cut belongs to the top corner of an injection-production unit, and there are two pumping wells in the injection-production unit: Connect the injection well to be cut with two extraction wells located at the edge respectively; Extend the two connecting lines outward by 25° respectively and determine whether they extend out of the horizontal axis or the vertical axis; If not, the injection well to be cut is cut directionally to form an edge hole according to the angle of the two extended connecting lines as the hole opening degree; Otherwise, a 90° edge hole is cut for the injection well to be cut within the range of the injection-production unit.

3. The directional well drilling method for an in-situ well field according to claim 1, characterized in that: If the injection well to be cut belongs to the vertex of multiple injection and production units, and each of the multiple injection and production units has a pumping well: Taking the injection well to be cut as the origin, a rectangular coordinate system is established in each injection and production unit; Connect the injection wells to be cut with all the pumping wells respectively; Obtain the angles between each connecting line and the horizontal axis and the vertical axis of the rectangular coordinate system, take the degree of the smaller angle as the preset degree, and take twice the value of the preset degree as the opening degree; Taking each connecting line as an angle bisector, corresponding opening degrees are cut in the rectangular coordinate system to which the injection well to be cut belongs to form edge holes.

4. The directional well drilling method for in-situ well field according to claim 1, characterized in that: If the injection well to be cut belongs to the vertex of multiple injection and production units, and multiple pumping wells are respectively arranged in the multiple injection and production units; Taking the injection well to be cut as the origin, a rectangular coordinate system is established in the injection and production unit to which it belongs; Then, edge holes are formed by cutting 90° in the rectangular coordinate system to which the injection well to be cut belongs.

5. The directional well drilling method for an in-situ well field according to claim 1, characterized in that: The edge holes have a hole density of 12-18 holes / m in the longitudinal direction.

6. The directional well drilling method for in-situ well field according to claim 1, characterized in that: The hole depth of the edge hole is greater than 0.2 meters.

7. A directional well drilling method for an in-situ leaching well field, wherein the in-situ leaching well field is an old mining area, characterized in that: It comprises at least one injection-production unit, which is composed of four injection wells located at the top corners, one extraction well located in the middle, and at least one leaching dead corner; The injection well located at the side of the leaching dead corner is used as the injection well to be cut; Determine the center point of the leaching dead corner; Connect the injection well and the pumping well to be cut to the central point respectively; The direction of the connecting line is taken as the hole opening direction, and the connecting line is taken as the angle bisector to directional cut and open holes for the injection well and the pumping well to be cut.

8. The directional well drilling method for an in-situ well field according to claim 7, characterized in that: include: A rectangular coordinate system is established with the injection well to be cut as the origin and the edge line of the injection and production unit as the horizontal and vertical axes; Obtaining the angles between the first connecting line and the horizontal axis and the vertical axis, taking the degree of the smaller angle as the preset degree, and taking twice the preset degree as the opening degree, wherein the first connecting line is the line connecting the injection well to be cut and the center point; Taking the first connecting line as the angle bisector, directional cutting is performed on the injection well to be cut according to the opening degree to form an edge hole.

9. The directional well drilling method for in-situ well field according to claim 7, characterized in that: Also includes: Obtaining a second connecting line, where the second connecting line is a connecting line between the pumping well and the center point; With the second connecting line as the angle bisector, a 90° edge hole is opened on the pumping well.

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