A differentiated straight and horizontal combination stereoscopic energy supplement well pattern design method for extra-low permeability reservoirs

Abstract

The application discloses a kind of special low permeability reservoir differentiation direct flat combination stereoscopic energy supplement well pattern design methods, steps are as follows: stratified deployment horizontal well in reservoir, make upper and lower horizontal well plane staggered and vertically superimposed and both length, row distance and orientation are similar or consistent;Design first and second ground platform set oppositely, and make the A and B points of upper horizontal well respectively with the B and A points of lower horizontal well in the same side;In the direction position of the outside of the central axis that the B point of two adjacent upper horizontal wells and the B point of two lower horizontal wells are connected respectively, first and second injection vertical well are respectively deployed;Perforation is respectively deployed at the B point of upper and lower horizontal well in first and second injection vertical well, and perforation is deployed near the A point of upper and lower horizontal well;First and second injection vertical well use stratified injection mode, and the B point and A point of each horizontal well are designed as increasing injection and reducing injection respectively.The application realizes reservoir effective use and realizes stereoscopic energy supplement.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of straight well energy supplement scheme and well pattern structure design method suitable for the development of low permeability reservoir by horizontal well, and more particularly, to a kind of low permeability reservoir differentiation straight plane combination stereoscopic energy supplement well pattern design method. BACKGROUND

[0002] In recent years, low permeability reservoir gradually occupies a pivotal position in the newly added proven reserves, and the yield of this type of reservoir has a trend of expanding year by year, and horizontal well volume fracturing has been proved to be one of the important means to effectively develop this type of reservoir. Block He 21 in Kaier area is the largest peripheral block of Liaohe in recent years, and its reservoir geological characteristics meet the low permeability limit. After the preliminary exploration and evaluation, horizontal well volume fracturing development has more significant effect than straight well development. After entering the development stage, according to the development characteristics of the reservoir, the two-layer horizontal well layering development is deployed in the area where a set of horizontal well cannot be completely used, which is plane interlaced and vertically superimposed. The stereoscopic well pattern has achieved remarkable results, high reservoir producing degree, high single well yield and fast oil production rate.

[0003] However, with the high liquid production of horizontal well relying on natural energy, how to scale and effectively supplement the formation energy has become a difficulty in the development of low permeability reservoir. Artificial energy supplement is first subject to the complex fracture network formed by volume fracturing. The conventional general injection method is prone to high-speed seepage of displacement phase along the secondary cracks, and cannot form an observable swept volume. Secondly, because of the pressure difference of horizontal well network in the horizontal well section seepage field, the displacement medium is easily gathered near the horizontal well A point and is produced. Finally, because of the reasons of low permeability reservoir itself, whether the injected medium can establish an effective displacement system is also an important consideration in reservoir engineering design.

[0004] Therefore, the prior art needs to be improved. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provide a low permeability reservoir differentiation straight plane combination stereoscopic energy supplement well pattern design method. The present application can realize effective reservoir use on one hand: in the reservoir that cannot be completely developed by a set of horizontal well, the reasonable layering deployment of horizontal well is used to realize effective development. On the other hand, it can realize stereoscopic energy supplement: it focuses on solving the problem of how to effectively supplement the formation energy in the process of horizontal well layering development, and at the same time of realizing energy stereoscopic supplement, it maximizes the mitigation of the channeling phenomenon caused by pressure field distribution and secondary cracks. The present application can finally realize long-term stable production of horizontal well, and realize the benefit of the development of this type of reservoir.

[0006] The technical scheme adopted by the present application is as follows:

[0007] According to an aspect of the present application, there is provided a method for designing a differentiated straight and horizontal combination stereoscopic energy supplement well pattern in a very low permeability reservoir, comprising the following steps:

[0008] 1) deploying horizontal wells in layers in the reservoir, and making the deployed upper horizontal well and lower horizontal well follow a relationship of "plane interlacing and vertical superposition" and keeping the length, spacing and azimuth parameters of the two similar or consistent, wherein the two ends of the horizontal section of the upper horizontal well and lower horizontal well are designed as A point and B point;

[0009] 2) designing the first ground platform and second ground platform arranged oppositely according to the layer where the horizontal well is located, and making the A point of the upper horizontal well and the B point of the lower horizontal well on the same side and the B point of the upper horizontal well and the A point of the lower horizontal well on the same side to ensure that the drilling direction of the upper horizontal well and the lower horizontal well is opposite;

[0010] 3) deploying a first injection straight well at a reasonable position outside the central axis connecting the B points of the two adjacent upper horizontal wells;

[0011] 4) deploying a second injection straight well at a reasonable position outside the central axis connecting the B points of the two adjacent lower horizontal wells;

[0012] 5) deploying the perforation of the first injection straight well at the B point of the upper horizontal well in the layer, and making the first injection straight well deploy a perforation near the A point of the lower horizontal well;

[0013] 6) deploying the perforation of the second injection straight well at the B point of the lower horizontal well in the layer, and making the second injection straight well deploy a perforation near the A point of the upper horizontal well;

[0014] 7) making the first injection straight well and the second injection straight well adopt a layered injection mode, and designing the B point of the upper horizontal well and the B point of the lower horizontal well to have an increased injection amount, and designing the A point of the upper horizontal well and the A point of the lower horizontal well to have a reduced injection amount.

[0015] In an embodiment of the present application, in step 1), the reservoir has economic feasibility for layered deployment and has geological necessity for layered deployment.

[0016] In an embodiment of the present application, in step 1), when deploying horizontal wells in layers in the reservoir, the length, spacing and azimuth of the horizontal well are determined according to the actual conditions of the reservoir and the fracture occurrence.

[0017] In an embodiment of the present application, when deploying horizontal wells, the length of each horizontal well is kept equal.

[0018] In an embodiment of the present application, when deploying horizontal wells, the length of the horizontal well is controlled to be 500-700 m.

[0019] In one embodiment of the present application, when deploying horizontal wells, the row spacing of the horizontal wells is determined based on fault development and fracture length.

[0020] In one embodiment of the present application, when deploying horizontal wells, the row spacing of the horizontal wells is less than the microseismic monitoring fracture length.

[0021] In one embodiment of the present application, when deploying horizontal wells, the horizontal wells avoid faults by more than 100m.

[0022] In one embodiment of the present application, when deploying horizontal wells, the row spacing of the horizontal wells is controlled to be 230-280m.

[0023] In one embodiment of the present application, when deploying horizontal wells, the deployment direction of the horizontal wells forms an angle of 60°-90° with the direction of the principal stress.

[0024] In one embodiment of the present application, in step 2), the first ground platform forms an upper local horizontal well pattern with the upper horizontal wells through a first target pre-displacement, and the second ground platform forms a lower local horizontal well pattern with the lower horizontal wells through a second target pre-displacement.

[0025] In one embodiment of the present application, the upper local horizontal well pattern and the lower local horizontal well pattern are combined to form a three-dimensional horizontal well pattern.

[0026] In one embodiment of the present application, in steps 3) and 4), the first injection vertical well and the second injection vertical well are completely identical.

[0027] In one embodiment of the present application, the injection medium of the first injection vertical well and the second injection vertical well includes water, gas, foam, polymer and gel.

[0028] In one embodiment of the present application, the first ground platform deploys the second injection vertical well through a third target pre-displacement, and the second ground platform deploys the first injection vertical well through a fourth target pre-displacement.

[0029] In one embodiment of the present application, in steps 3) and 4), the reasonable positions are determined based on overall factors of the reservoir and fracturing.

[0030] In one embodiment of the present application, the injection-production well spacing is designed to be 100-120m.

[0031] In one embodiment of the present application, in steps 5) and 6), the perforation is bet by means of non-fracturing or controlled fracturing scale.

[0032] In one embodiment of the present application, in step 7), the corresponding injection amount is adjusted according to the reservoir development characteristics and the actual injection-production well spacing, and then the corresponding injection amount is dynamically adjusted according to the production well response and water breakthrough characteristics.

[0033] According to another aspect of the present application, a differentiated straight-flat combined stereoscopic energy supplement well pattern structure for ultra-low permeability reservoirs is provided, wherein the structure is designed by the differentiated straight-flat combined stereoscopic energy supplement well pattern design method for ultra-low permeability reservoirs as described above.

[0034] By adopting the technical scheme, the present application has at least the following beneficial effects:

[0035] (1) The present application greatly improves the producing degree of reserves, reduces the loss of recoverable reserves, and does not need to reserve space for injection well rows at low parts of the reservoir, but realizes the overall producing of the reservoir by taking the same layer injection and production.

[0036] (2) The present application greatly improves the injection efficiency of injection wells, and avoids the channeling phenomenon caused by the pressure field distribution near the horizontal well section and the artificial fracture as much as possible through the optimization and reasonable application of the well pattern structure.

[0037] (3) The present application improves the production efficiency of production wells, realizes the full-time production of the production wells in theory, and does not exist the production time reduction of the production wells caused by the asynchronous injection and production and the injection water throughput, and reasonably improves the oil recovery rate and production efficiency of the reservoir. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed by the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0039] Figure 1 A flowchart of the differentiated straight-flat combined stereoscopic energy supplement well pattern design method for ultra-low permeability reservoirs provided by the present application is shown;

[0040] Figure 2 is a top view of the differentiated straight-flat combined stereoscopic energy supplement well pattern structure designed by the method of Figure 1 ;

[0041] Figure 3 is a side view of the differentiated straight-flat combined stereoscopic energy supplement well pattern structure designed by the method of Figure 1 ;

[0042] Figure 4 is a perspective view of the differentiated straight-flat combined stereoscopic energy supplement well pattern structure designed by the method of Figure 1 .

[0043] List of reference signs

[0044] 1 upper layer horizontal well, 2 lower layer horizontal well, 3 first injection vertical well, 4 second injection vertical well, 11 first target front displacement, 12 upper layer reference plane, 21 second target front displacement, 22 lower layer reference plane, 31 third target front displacement, 32 upper layer injection streamline, 33 lower layer injection streamline, 34 perforation, 35 fourth target front displacement, 41 first ground platform, 42 second ground platform. DETAILED DESCRIPTION

[0045] In order to make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application are further described in detail below with reference to the drawings.

[0046] As shown in the drawings, Figures 1-4 The present application provides a differentiated straight and flat combined three-dimensional energy supplement well pattern design method for ultra-low permeability reservoirs. The steps of the method are as follows:

[0047] Step S101: stratified deployment of horizontal wells in the reservoir, determination of reasonable horizontal well length, row spacing and orientation according to actual reservoir conditions and fracture occurrence, etc., the upper and lower layer horizontal wells 1, 2 should follow the relationship of "plane staggered, vertical superimposed", and the length, row spacing and orientation should be similar or consistent, wherein the two ends of the horizontal section of the upper layer horizontal well 1 and the lower layer horizontal well 2 are designed as A point and B point.

[0048] Step S102: design two opposite first and second ground platforms 41, 42 according to the layer where the horizontal well is located, so that the A point of the upper layer horizontal well 1 and the B point of the lower layer horizontal well 2 are on the same side, and the B point of the upper layer horizontal well 1 and the A point of the lower layer horizontal well 2 are on the same side, i.e. the drilling direction of the upper and lower layer horizontal wells 1, 2 is opposite.

[0049] Step S103: deploy the first injection vertical well 3 at a reasonable position outside the central axis connecting the B points of the adjacent two upper layer horizontal wells 1.

[0050] Step S104: deploy the second injection vertical well 4 at a reasonable position outside the central axis connecting the B points of the adjacent two lower layer horizontal wells 2.

[0051] Step S105: deploy the perforation 34 of the first injection vertical well 3 at the B point of the upper layer horizontal well 1 in the layer, and bet with non-fracturing or controlled fracturing scale, and deploy the perforation 34 of the first injection vertical well 3 near the A point of the lower layer horizontal well 2, and bet with non-fracturing or controlled fracturing scale.

[0052] Step S106: deploying a second injection vertical well 4 at point B of the lower horizontal well 2 to perforate 34 at the current layer, and betting in a way of no-fracturing or controlled fracturing scale, and the perforation 34 of the second injection vertical well 4 is deployed near point A of the upper horizontal well 1, and betting in a way of no-fracturing or controlled fracturing scale.

[0053] Step S107: the first and second injection vertical wells 3, 4 are both designed to be injected in a layered manner, and the injection scale is larger at point B of the upper horizontal well 1 and point B of the lower horizontal well 2, and the injection scale is smaller at point A of the upper horizontal well and point A of the lower horizontal well 2.

[0054] In the above method of the present application, the injection medium of the first and second injection vertical wells 3, 4 can be water, gas, foam, polymer, gel, etc.

[0055] In the above method of the present application, the oil reservoir should have economic feasibility of layered deployment and geological necessity of layered deployment; the length of the production well mainly considers the rationality of the injection-production well pattern, and the horizontal well section should be avoided to be too long due to the use of vertical well injection, and the short horizontal well "five-point method" well pattern is designed, and the reasonable length is 500-700m in the low-permeability reservoir combined with field experience; the row spacing of the production well mainly refers to the development of faults and the length of the fracturing cracks, and the row spacing should be less than the length of the microseismic monitoring cracks, for example, if the actual length of the field cracks is about 200m, the reasonable row spacing is designed to be 230-280m, and the deployment of the horizontal well should avoid the faults above 100m; the orientation of the production well mainly refers to the development of faults and the development direction of the fracturing cracks, and the orientation of the production well should be 60°-90° to the direction of the principal stress to avoid the rapid advance of the injection phase, increase the swept volume, and optimize the modified volume after fracturing of the production well.

[0056] In the above method of the present application, the layer where the horizontal well is located is designed to have two oppositely arranged first ground platforms 41 and second ground platforms 42, the upper horizontal well 1 is all drilled by the first ground platform 41, and the lower horizontal well 2 is all drilled by the opposite second ground platform 42, and the orientations of the upper horizontal well 1 and the lower horizontal well 2 are consistent, and the drilling directions are opposite.

[0057] In the above method of the present application, the reasonable position of the B point of each horizontal well outside the central axis should consider the overall factors of the reservoir and fracturing, that is, the width of the fracturing cracks of each horizontal well should not reach the position drilled by the vertical well, and it is suggested that the injection-production well spacing is 100-120m.

[0058] In the above method of the present application, the first injection vertical well 3 and the second injection vertical well 4 are both perforated 34 in the upper and lower layers, and the pressure difference of the seepage field of the horizontal well section in the subsurface should be considered, and the fracturing measures should be properly taken near the B point of the upper horizontal well 1 and the B point of the lower horizontal well 2 to reduce the injection difficulty and increase the injection amount, and the original formation porosity and permeability characteristics should be maintained as much as possible near the A point of the upper horizontal well 1 and the A point of the lower horizontal well 2 to reduce the injection amount and slow down the channeling.

[0059] More specifically, as shown in the specific implementation of the above method, Figures 2-4 the present application provides a differential straight and flat combined three-dimensional energy supplement well pattern design method for ultra-low permeability reservoirs. While effectively supplementing the formation energy, the method realizes long-term stable production of the horizontal well, and mainly includes the following steps:

[0060] (1) The horizontal wells are deployed in layers in the reservoir, wherein the upper horizontal well 1 and the lower horizontal well 2 are deployed, the upper and lower horizontal wells 1 and 2 are staggered in planar projection, and the horizontal section well trajectories are parallel, consistent in azimuth, and consistent or close in length, as shown in Figure 2 . In this step, according to the actual situation of the reservoir, it is impossible to rely on volume fracturing to form a scale fracture network to connect the two sets of reservoirs by deploying a layer of horizontal well, so it is necessary to deploy the horizontal well in geology. After economic calculation, the internal rate of return of the horizontal well deployment scheme is 16.8%, which has the feasibility of economically deploying the horizontal well in layers. In the ideal case, the lengths of the horizontal wells should be equal, and in the actual deployment process, the lengths of the horizontal wells should be adjusted appropriately according to the development of the oil layer, but the length difference of the horizontal wells in the same region should not be too large, and the length of the horizontal well should be controlled within 600m. The horizontal well spacing is determined by referring to the development of faults and the length of fracturing cracks. In theory, the spacing should be less than the length of the microseismic monitoring crack to maximize the volume of fracturing reconstruction, and the horizontal well should be deployed to avoid faults above 100m, so the reasonable spacing of the horizontal well is determined by referring to the above factors. The azimuth of the horizontal well is mainly determined by referring to the development of faults and the development direction of fracturing cracks, and the azimuth of the production well should be preferably 60° to the main stress direction, and the horizontal well should be deployed along the development direction of the fault to maximize the control degree of the well pattern.

[0061] (2) Two oppositely arranged first ground platforms 41 and second ground platforms 42 are designed according to the layer where the horizontal well is located, as shown in Figure 2 , wherein the first ground platform 41 forms an upper local horizontal well pattern with the upper horizontal well 1 through a first target front displacement 11; the second ground platform 42 forms a lower local horizontal well pattern with the lower horizontal well 2 through a second target front displacement 21, and the upper and lower well patterns combine to form a three-dimensional horizontal well pattern.

[0062] (3) Referring to Figure 2 and 4As shown, in a reasonable position outside the connecting line of the B point mid-axes of the two adjacent upper layer horizontal wells 1, the second platform 42 in the lower layer system (the structure at the reference plane 22 of the lower layer system) is designed by the fourth target pre-displacement 35 to design the first injection straight well 3, which constitutes a local injection-production well pattern. The deployment position should consider the overall factors of the reservoir and fracturing, and the injection-production well spacing is designed to be 100 m.

[0063] (4) As shown, in a reasonable position outside the connecting line of the B point mid-axes of the two adjacent lower layer horizontal wells 2, the first platform 41 in the upper layer system (the structure at the reference plane 12 of the upper layer system) is designed by the third target pre-displacement 31 to design the second injection straight well 4, which constitutes a local injection-production well pattern, and the straight well and the horizontal well form a three-dimensional injection-production well pattern, wherein the first injection straight well 3 and the second injection straight well 4 are completely the same.

[0064] (5) As shown, Figures 2-3 the first injection straight well 3 at the first platform 41 is deployed with a perforation 34, which is bet in a non-fracturing or controlled fracturing scale manner at the B point corresponding to the upper layer horizontal well 1, and is bet in a non-fracturing or controlled fracturing scale manner at the A point corresponding to the lower layer horizontal well 2.

[0065] (6) As shown, Figures 2-3 the second injection straight well 4 at the second platform 42 is deployed with a perforation 34, which is bet in a non-fracturing or controlled fracturing scale manner at the B point corresponding to the lower layer horizontal well 2, and is bet in a non-fracturing or controlled fracturing scale manner at the A point corresponding to the upper layer horizontal well 1.

[0066] (7) As shown, Figures 2-4 the first injection straight well 3 and the second injection straight well 4 both adopt the way of separate layer injection, wherein the perforation 34 of the second injection straight well 4 in the upper layer system corresponds to the injection flow line 32, the injection amount at the A point of the upper layer horizontal well 1 should be appropriately reduced, and the injection amount at the B point of the lower layer horizontal well 2 can be relatively increased; the perforation 34 of the first injection straight well 3 in the lower layer system corresponds to the injection flow line 33, the injection amount at the A point of the lower layer horizontal well 2 should be appropriately reduced, and the injection amount at the B point of the upper layer horizontal well 1 can be relatively increased. The injection amount of each injection well perforation 34 should follow the principle of "less injection near the A point and more injection near the B point", and the overall injection-production ratio should be maintained at 1:1, and the design injection amount can be appropriately adjusted according to the development characteristics of the reservoir and the actual injection-production well spacing, and then the injection amount is dynamically adjusted according to the production well response and water breakthrough characteristics.

[0067] Thus, by the above embodiments of the present application, on one hand, effective reservoir exploitation is achieved: in a reservoir that cannot be completely exploited by a set of horizontal wells, the horizontal wells are deployed by reasonable layering to achieve effective exploitation; and on the other hand, three-dimensional energy supplement is achieved: the problem of how to effectively supplement the formation energy in the process of horizontal well layering development is solved, and the channeling phenomenon caused by pressure field distribution and secondary cracks is minimized while achieving three-dimensional energy supplement.

[0068] The above merely describes preferred embodiments of the present application and is not intended to limit the scope of the present application; if the present application is modified or replaced equivalently without departing from the spirit and scope of the present application, it should be covered in the protection scope of the claims of the present application.

Claims

1. A method for designing a differentiated straight-flat combined three-dimensional energy-replenishing well pattern for ultra-low permeability reservoirs, characterized in that: The following steps are involved: 1) Horizontal wells are deployed in layers within the reservoir, with the upper and lower horizontal wells arranged in a "planar staggered, vertically stacked" pattern, and their lengths, row spacing, and orientation parameters kept similar or consistent. The ends of the horizontal sections of the upper and lower horizontal wells are designed as points A and B. 2) Design the first and second surface platforms opposite to each other according to the horizontal well's position, and ensure that point A of the upper horizontal well and point B of the lower horizontal well are on the same side, and point B of the upper horizontal well and point A of the lower horizontal well are on the same side to ensure that the upper and lower horizontal wells are drilled in opposite directions; 3) Deploy the first vertical injection well at a reasonable location outside the central axis connecting point B of the two adjacent upper horizontal wells; 4) Deploy a second vertical injection well at a reasonable location outside the central axis connecting point B of the two adjacent lower horizontal wells; 5) Deploy perforation of the first vertical injection well at point B of the upper horizontal well in the same layer, and deploy perforation of the first vertical injection well near point A of the lower horizontal well; 6) Deploy perforation of the second vertical injection well at point B of the lower horizontal well in the same layer, and deploy perforation of the second vertical injection well near point A of the upper horizontal well; 7) The first and second vertical injection wells are designed to adopt a layered injection method, and the injection rate at point B of the upper horizontal well and point B of the lower horizontal well is designed to be increased, and the injection rate at point A of the upper horizontal well and point A of the lower horizontal well is designed to be reduced. In step 1), when horizontal wells are deployed in layers in the reservoir, the length, spacing, and orientation of the horizontal wells are determined based on the actual reservoir conditions and the occurrence of the hydraulic fractures. The spacing of the horizontal wells is determined based on the development of the faults and the length of the hydraulic fractures, and the deployment orientation of the horizontal wells is at an angle of 60° to 90° to the principal stress direction.

2. The method for designing a differentiated straight-horizontal combined three-dimensional energy-replenishing well pattern for ultra-low permeability reservoirs according to claim 1 is characterized in that: In step 1), the oil reservoir has economic feasibility and geological necessity for layered deployment.

3. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 1 is characterized in that: When deploying horizontal wells, the lengths of the individual horizontal wells are kept equal.

4. The method for designing a differentiated straight-horizontal combined three-dimensional energy replenishment well pattern for ultra-low permeability reservoirs according to claim 1 is characterized in that: When deploying horizontal wells, the length of the horizontal wells is controlled at 500-700m.

5. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 1 is characterized in that: When deploying horizontal wells, the spacing between horizontal wells is smaller than the length of the microseismic monitoring fracture.

6. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 5 is characterized in that: When deploying horizontal wells, the horizontal wells should avoid faults by more than 100m.

7. The method for designing a differentiated straight-horizontal combined three-dimensional energy-replenishing well pattern for ultra-low permeability reservoirs according to claim 6 is characterized in that: When deploying horizontal wells, the spacing between horizontal wells is controlled at 230-280m.

8. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 1 is characterized in that: In step 2), the first surface platform forms an upper local horizontal well pattern with the upper horizontal wells through a first pre-target displacement, and the second surface platform forms a lower local horizontal well pattern with the lower horizontal wells through a second pre-target displacement.

9. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 8 is characterized in that: The upper local horizontal well network and the lower local horizontal well network are combined to form a three-dimensional horizontal well network.

10. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 1 is characterized in that: In steps 3) and 4), the first vertical injection well is identical to the second vertical injection well.

11. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 10, characterized in that: The injection media of the first vertical injection well and the second vertical injection well include water, gas, and foam.

12. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 10, characterized in that: The injection medium of the first vertical injection well and the second vertical injection well includes polymer.

13. The method for designing a differentiated straight-horizontal combined three-dimensional energy-replenishing well pattern for ultra-low permeability reservoirs according to claim 10, characterized in that: The injection medium of the first vertical injection well and the second vertical injection well includes gel.

14. The method for designing a differentiated straight-horizontal combined three-dimensional energy replenishment well pattern for ultra-low permeability reservoirs according to any one of claims 11 to 13, characterized in that: The first ground platform deploys the second vertical injection well by the third target front displacement, and the second ground platform deploys the first vertical injection well by the fourth target front displacement.

15. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 1, characterized in that: In steps 3) and 4), reasonable locations are determined based on overall factors of the reservoir and fracturing.

16. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 15, characterized in that: The injection-production well spacing is designed to be 100-120 m.

17. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 1, characterized in that: In steps 5) and 6), perforation is performed without fracturing or with controlled fracturing scale.

18. The method for designing a differentiated straight-horizontal combined three-dimensional energy-boosting well pattern for ultra-low permeability reservoirs according to claim 1, characterized in that: In step 7), the corresponding injection rate is adjusted according to the reservoir development characteristics and the actual injection-production well spacing, and then the corresponding injection rate is dynamically adjusted according to the production well effectiveness and water breakthrough characteristics.

19. A differentiated straight-flat combination three-dimensional energy-replenishing well pattern structure for ultra-low permeability reservoirs, characterized by: The well pattern is designed by the method for designing a differentiated straight-flat combined three-dimensional energy replenishment well pattern for ultra-low permeability reservoirs as described in any one of claims 1 to 18.

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