Horizontal well group well placement method and apparatus

Abstract

The application discloses a horizontal well group well arrangement method and device, and relates to the technical field of oil and gas geology drilling; wherein the method comprises the following steps: constructing a plurality of horizontal well group basic units in the area where the oil and gas resources are located in the interior of the source rock according to the size of each drilling area; two target front distance areas in the horizontal well group basic unit are distributed on the two sides of the process implementation area along the borehole trajectory of the horizontal well group, and one well site deployment area is distributed on the side away from the process implementation area of each target front distance area along the borehole trajectory of the horizontal well group; the process implementation area in each horizontal well group basic unit is mutually overlapped with the target front distance area and / or the well site deployment area in other horizontal well group basic units, and the borehole trajectories of the horizontal well groups in the process implementation areas of the adjacent horizontal well group basic units are perpendicular to each other. The application can reduce the waste of oil and gas resources and avoid the risk of intersection of the borehole trajectories under the process implementation areas of the adjacent horizontal well group basic units.

Description

Technical Field

[0001] This invention relates to the field of oil and gas geological drilling technology, and in particular to a method and apparatus for horizontal well group layout. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] Currently, oil and gas exploration and development is gradually shifting towards the development of in-source oil and gas resources within source rocks. In-source oil and gas resources are generally widely distributed and characterized by immaturity, extremely low porosity and permeability, and difficulty in extraction. Therefore, special technologies are required for exploration and development. For example, in-situ electric heating methods can be used to convert unconverted organic matter and generated hydrocarbons in medium- to low-maturity in-source oil and gas resources into light oil and natural gas for development. This technology requires deploying dense horizontal well groups in large areas of source rock formations and installing numerous equidistant heating sources with small spacing within the horizontal well sections. Uniform heating of the formation accelerates the conversion of organic matter and hydrocarbons into natural gas and light oil. Therefore, before developing in-source oil and gas resources, a reasonable well layout method is needed, considering drilling technology, to ensure the full development of in-source oil and gas resources and reduce resource waste caused by drilling technology and the distribution characteristics of in-source oil and gas resources.

[0004] Because the distribution patterns and characteristics of external oil and gas resources differ from those of internal oil and gas resources, current well placement methods for external oil and gas resources are not applicable to internal oil and gas resources. Using well placement methods for external oil and gas resources to place wells in internal oil and gas resources will lead to insufficient development of internal oil and gas resources and waste of internal oil and gas resources. Summary of the Invention

[0005] This invention provides a horizontal well group placement method to fully develop oil and gas resources in the source area through a reasonable well placement method, thereby reducing the waste of oil and gas resources. The method includes:

[0006] The dimensions of each drilling area are determined based on the maximum build-up rate achievable by the drilling tools and the well site area required for drilling operations; wherein, the drilling area includes: the target distance area where the build-up section of the wellbore trajectory of the horizontal well group is located, the well site deployment area where the vertical section of the wellbore trajectory of the horizontal well group is located, and the process implementation area where the horizontal section of the wellbore trajectory of the horizontal well group is located.

[0007] Based on the dimensions of each drilling area, multiple horizontal well group basic units are constructed within the oil and gas resource area inside the source rock. Each horizontal well group basic unit includes two target distance areas, two well site deployment areas, and one process implementation area. The two target distance areas within each basic unit are distributed along the wellbore trajectory of the horizontal well group on both sides of the process implementation area. A well site deployment area is located on the side of each target distance area furthest from the process implementation area along the wellbore trajectory of the horizontal well group. The process implementation area in each basic unit overlaps with the target distance areas and / or well site deployment areas in other basic units. The wellbore trajectories of the horizontal well groups in the process implementation areas of adjacent basic units are perpendicular to each other.

[0008] This invention also provides a horizontal well group placement device to fully develop oil and gas resources in the source area through a reasonable well placement method, thereby reducing the waste of oil and gas resources. The device includes:

[0009] The size calculation module is used to determine the size of each drilling area based on the maximum build-up rate that the drilling tools can achieve and the well site area required for drilling operations; wherein, the drilling area includes: the target distance area where the build-up section of the wellbore trajectory of the horizontal well group is located, the well site deployment area where the vertical section of the wellbore trajectory of the horizontal well group is located, and the process implementation area where the horizontal section of the wellbore trajectory of the horizontal well group is located.

[0010] The region division module is used to construct multiple horizontal well group basic units within the hydrocarbon source rock's oil and gas resource area based on the size of each drilling region. Each horizontal well group basic unit includes two target distance regions, two well site deployment regions, and one process implementation region. The two target distance regions in the horizontal well group basic unit are distributed on both sides of the process implementation region along the wellbore trajectory of the horizontal well group. A well site deployment region is distributed on the side of each target distance region away from the process implementation region along the wellbore trajectory of the horizontal well group. The process implementation region in each horizontal well group basic unit overlaps with the target distance regions and / or well site deployment regions in other horizontal well group basic units. The wellbore trajectories of the horizontal well groups in the process implementation regions of adjacent horizontal well group basic units are perpendicular to each other.

[0011] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described horizontal well group layout method.

[0012] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described horizontal well group placement method.

[0013] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described horizontal well group placement method.

[0014] In this embodiment of the invention, the dimensions of each drilling region are determined based on the maximum build-up rate achievable by the drilling tools and the well site area required for drilling operations. The drilling region includes: the target distance region where the build-up section of the wellbore trajectory of the horizontal well group is located; the well site deployment region where the vertical section of the wellbore trajectory of the horizontal well group is located; and the process implementation region where the horizontal section of the wellbore trajectory of the horizontal well group is located. Based on the dimensions of each drilling region, multiple horizontal well group basic units are constructed within the oil and gas resource area inside the source rock. Each horizontal well group basic unit includes two target distance regions, two well site deployment regions, and one process implementation region. The two target distance regions in each horizontal well group basic unit are distributed along the wellbore trajectory of the horizontal well group on both sides of the process implementation region. A well site deployment region is distributed along the side of each target distance region away from the process implementation region along the wellbore trajectory of the horizontal well group. The process implementation region in each horizontal well group basic unit overlaps with the target distance regions and / or well site deployment regions in other horizontal well group basic units, and the wellbore trajectories of the horizontal well groups in the process implementation regions of adjacent horizontal well group basic units are perpendicular to each other. In this way, by dividing the oil and gas resource area inside the source rock into multiple horizontal well group basic units, the process implementation area in one horizontal well group basic unit can overlap with the area formed by the target distance area and well site deployment area in other horizontal well group basic units. This ensures that the oil and gas resources under the area formed by the target distance area and well site deployment area in the horizontal well group basic unit can also be developed, thus achieving full development of the oil and gas resources under the source rock oil and gas resource area and reducing the waste of oil and gas resources. In addition, the well trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other, which can avoid the risk of well trajectory collision in the process implementation areas of adjacent horizontal well group basic units. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0016] Figure 1 This is a flowchart of a horizontal well group layout method provided in an embodiment of the present invention;

[0017] Figure 2This is an example diagram of a basic unit of a horizontal well group composed of various drilling areas provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the wellhead arrangement of a basic unit for a horizontal well group provided in an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the wellhead distribution in a well site deployment area provided in an embodiment of the present invention;

[0020] Figure 5 This is a flowchart of a method for determining the size of each drilling area based on the maximum build-up rate achievable by the drilling tool and the well site area required for drilling operations, provided in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the dimensions of a horizontal well group basic unit provided in an embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the cross-connection method of the basic units of a horizontal well group provided in an embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram illustrating the connection result of a horizontal well group basic unit crossover method provided in an embodiment of the present invention;

[0024] Figure 9 This is a schematic diagram of a horizontal well group layout device provided in an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0026] In this document, the term "and / or" merely describes a relationship, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0027] In the description of this specification, the terms "comprising," "including," "having," and "containing" are open-ended terms, meaning that they include but are not limited to. The terms "an embodiment," "a specific embodiment," "some embodiments," and "for example," etc., refer to specific features, structures, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. The order of steps involved in the various embodiments is used to illustrate the implementation of this application, and the order of steps is not limited and can be adjusted appropriately as needed.

[0028] Research has revealed that source oil and gas resources are generally widely distributed and characterized by immaturity, extremely low porosity and permeability, and difficulty in extraction. Therefore, special exploration and development technologies are required. For example, in-situ electric heating can convert unconverted organic matter and generated hydrocarbons in medium- to low-maturity source oil and gas resources into light oil and natural gas for development. This technology requires deploying dense horizontal well groups in large areas of source rock formations and installing numerous equidistant heating sources with small spacing within the horizontal well sections. Uniform heating of the formation accelerates the conversion of organic matter and hydrocarbons into natural gas and light oil. Therefore, before developing source oil and gas resources, a reasonable well layout method is necessary, considering drilling technology, to ensure the full development of source oil and gas resources and reduce resource waste caused by drilling techniques and the distribution characteristics of source oil and gas resources. Because the distribution patterns and characteristics of external oil and gas resources differ from those of internal oil and gas resources, current well placement methods for external oil and gas resources are not applicable to internal oil and gas resources. Using well placement methods for external oil and gas resources to place wells in internal oil and gas resources will lead to insufficient development of internal oil and gas resources and waste of internal oil and gas resources.

[0029] In response to the above research, embodiments of the present invention provide a method for horizontal well group placement, such as... Figure 1 As shown, it includes:

[0030] S101: Determine the size of each drilling area based on the maximum build-up rate achievable by the drilling tools and the well site area required for drilling operations; wherein, the drilling area includes: the target distance area where the build-up section of the wellbore trajectory of the horizontal well group is located, the well site deployment area where the vertical section of the wellbore trajectory of the horizontal well group is located, and the process implementation area where the horizontal section of the wellbore trajectory of the horizontal well group is located.

[0031] S102: Based on the dimensions of each drilling area, construct multiple horizontal well group basic units within the hydrocarbon source rock's oil and gas resource area; each horizontal well group basic unit includes two target distance areas, two well site deployment areas, and one process implementation area; the two target distance areas in the horizontal well group basic unit are distributed along the wellbore trajectory of the horizontal well group on both sides of the process implementation area, and a well site deployment area is distributed on the side of each target distance area away from the process implementation area along the wellbore trajectory of the horizontal well group; the process implementation area in each horizontal well group basic unit overlaps with the target distance areas and / or well site deployment areas in other horizontal well group basic units, and the wellbore trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other.

[0032] In this embodiment of the invention, the dimensions of each drilling region are determined based on the maximum build-up rate achievable by the drilling tools and the well site area required for drilling operations. The drilling region includes: the target distance region where the build-up section of the wellbore trajectory of the horizontal well group is located; the well site deployment region where the vertical section of the wellbore trajectory of the horizontal well group is located; and the process implementation region where the horizontal section of the wellbore trajectory of the horizontal well group is located. Based on the dimensions of each drilling region, multiple horizontal well group basic units are constructed within the oil and gas resource area inside the source rock. Each horizontal well group basic unit includes two target distance regions, two well site deployment regions, and one process implementation region. The two target distance regions in each horizontal well group basic unit are distributed along the wellbore trajectory of the horizontal well group on both sides of the process implementation region. A well site deployment region is distributed along the side of each target distance region away from the process implementation region along the wellbore trajectory of the horizontal well group. The process implementation region in each horizontal well group basic unit overlaps with the target distance regions and / or well site deployment regions in other horizontal well group basic units, and the wellbore trajectories of the horizontal well groups in the process implementation regions of adjacent horizontal well group basic units are perpendicular to each other. In this way, by dividing the oil and gas resource area inside the source rock into multiple horizontal well group basic units, the process implementation area in one horizontal well group basic unit can overlap with the area formed by the target distance area and well site deployment area in other horizontal well group basic units. This ensures that the oil and gas resources under the area formed by the target distance area and well site deployment area in the horizontal well group basic unit can also be developed, thus achieving full development of the oil and gas resources under the source rock oil and gas resource area and reducing the waste of oil and gas resources. In addition, the well trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other, which can avoid the risk of well trajectory collision in the process implementation areas of adjacent horizontal well group basic units.

[0033] The following provides a detailed explanation of S101 to S102.

[0034] For the aforementioned S101, the drilling area includes, for example, the target distance area where the build-up section of the wellbore trajectory of the horizontal well group is located, the well site deployment area where the vertical section of the wellbore trajectory of the horizontal well group is located, and the process implementation area where the horizontal section of the wellbore trajectory of the horizontal well group is located.

[0035] In one embodiment of the present invention, the well site deployment area is used to deploy the wellhead of a horizontal well group; the process implementation area contains a formation with oil and gas resources; the horizontal well group is deployed in the formation with oil and gas resources under the process implementation area; wherein, the horizontal well group includes at least one of the following: a special process well, a production well, and an auxiliary well.

[0036] Here, as Figure 2 The diagram shown is an example of a basic unit for a horizontal well group composed of various drilling areas according to an embodiment of the present invention. In this diagram, 10 represents the process implementation area, 20 represents the target distance area, and 30 represents the well site deployment area. A specific formation 11 beneath the process implementation area 10 contains oil and gas resources, requiring the drilling of intensive horizontal wells 40 (i.e., a horizontal well group) within this specific formation 11. Intensive horizontal wells may include, for example, special process wells, production wells, and auxiliary wells.

[0037] Special process wells refer to wells with special processes designed for the real-time extraction of special oil and gas, including but not limited to special processes that require dense wellbore structures, such as electric heating, fluid heating, radiation heating, and combustion heating. Production wells are wells that extract liquids containing mixtures of oil and gas from formations. Auxiliary wells are wells drilled to ensure normal well construction, production, and management, such as control wells to ensure successful drilling of target reservoirs, measurement wells to measure reservoir production parameters, and observation wells to observe reservoir production dynamics.

[0038] In addition, such as Figure 2 As shown, the horizontal well sections of the dense horizontal wells 40 (i.e., the horizontal well group) are distributed in a specific stratum 11 below the process implementation area 10. Their length can be approximately equal to or slightly less than the length of the process implementation area according to the needs of the engineering process. The directional section or trajectory adjustment section (the main horizontal displacement offset section) of the dense horizontal wells 40 is located in the target distance area 20, and the vertical well section is located in the well site deployment area 30.

[0039] Furthermore, when deploying horizontal well groups, at least the area containing the wellbore trajectory's build-up section, horizontal section, and vertical section of the horizontal well group is required. Therefore, a basic unit of a horizontal well group can consist of, for example, the process implementation area, the target distance area, and the well site deployment area. Due to the use of special extraction processes, the horizontal well sections of densely packed horizontal wells 40 are typically quite dense, meaning the horizontal well section layers in the horizontal well group are more than one, and the distance between the horizontal well sections of different wells is small (e.g., below 50m, the distance between the horizontal well sections of different wells is even only a few meters). This results in a large number of wells, and the wellheads need to be distributed on both sides of the aforementioned process implementation area 10, that is, deployed in two well site deployment areas 20 (e.g., ...). Figure 3 As shown, this is a schematic diagram of the wellhead arrangement of a basic unit for a horizontal well group according to an embodiment of the present invention. Therefore, as Figure 2 As shown, a basic unit 1 of a horizontal well group may include, for example, two target distance regions 20, two well site deployment regions 30, and a process implementation region 10; wherein, the two target distance regions 20 in the basic unit of the horizontal well group are distributed on both sides of the process implementation region 10 along the wellbore trajectory of the horizontal well group, and a well site deployment region 30 is distributed on the side of each target distance region 20 away from the process implementation region 10 along the wellbore trajectory of the horizontal well group.

[0040] Here, the number of wellheads of the dense horizontal wells 40 distributed on both sides of the process implementation area 10 can be evenly distributed or unevenly distributed, that is, they can be separated in a way that one side has more and the other side has less.

[0041] Specifically, the wellheads deployed in the well site deployment area 30 on each side can be arranged in single or multiple rows. The spacing between different wellheads and between different rows of wellheads can be determined according to the drilling operation requirements, the specific requirements of production wells, and wells with special processes. The wellheads can completely fill the well site deployment area 30 (e.g., ...). Figure 4 As shown in (1), it can also be applied to certain areas distributed within it (such as...). Figure 4 As shown in (2) and (3), it can be deployed parallel to the target front distance area of ​​20 (as shown in the diagram). Figure 4 As shown in (4), it can be deployed in a non-parallel manner (as shown in the middle). Figure 4 As shown in (5).

[0042] like Figure 5 The diagram shown is a flowchart of a method for determining the size of each drilling area based on the maximum build-up rate achievable by the drilling tools and the well site area required for drilling operations, according to an embodiment of the present invention. The method includes:

[0043] S501: Determine the length of the target front distance region based on the maximum build-up rate achievable by the drilling tool.

[0044] Specifically, for example, the length of the target front distance region can be calculated using the following formula:

[0045] a 20 =1719.75 / F max ;

[0046] Among them, a 20 F is the length of the area in front of the target; max The maximum build-up rate achievable by the drilling tool (i.e., the average build-up rate of the well with the highest build-up rate in the well site), is expressed in degrees / 30 meters (° / 30m). For example, the maximum build-up rate can be 2 to 10° / 30m.

[0047] Here, the skewing section can be approximated as a circular arc, and the distance to the target can be used to calculate the skewing section. Calculating the slope section using the slope ratio so Therefore b 20 =1719.75 / F max .

[0048] S502: Determine the length of the well site deployment area based on the well site area required for drilling operations.

[0049] Specifically, the well site deployment area not only needs to deploy the wellheads of horizontal well groups, but also needs to provide space for drilling rig operations. Therefore, the length of the well site deployment area needs to be determined according to the well site area required for drilling rig operations. For example, the length of the well site deployment area can be between 100 and 150m. This is just an example value. The specific length of the well site deployment area can be determined by combining the actual well site area required for drilling rig operations.

[0050] S503: Determine the first side length of the process implementation area, the width of the target distance area, and the width of the well site deployment area based on the length of the target distance area and the length of the well site deployment area.

[0051] Specifically, for example, the first side length of the process implementation area can be calculated using the following formula:

[0052] a 10 =2×(a) 20 +a 30 );

[0053] Among them, a 10 Let a be the length of the first side. 20 The length of the target front distance zone, a 30 The length of the well site deployment area.

[0054] Here, the process implementation area is square. The width of the target-front distance area and the width of the well site deployment area are equal to the length of the first side. The length directions of the target-front distance area and the well site deployment area are parallel to the wellbore trajectory of the horizontal well group, such as... Figure 6The figure shown is a schematic diagram of the dimensions of a horizontal well group basic unit provided in an embodiment of the present invention, wherein b 10 The width of the area where the process is implemented (equal to the length of the first side), b 20 b represents the width of the area in front of the target (equal to the length of the first side). 30 Represents the width of the well site deployment area (equal to the length of the first side).

[0055] In a preferred embodiment, F max The value of is generally between 3 and 10° / 30m, usually around 5° / 30m, which is a. 20 The value is around 350m, and the well site has a reserved length a. 30 The specific requirements can be determined based on actual operational needs, such as the number of well rows and drilling rigs operating simultaneously, and the theoretical space between different well rows and drilling rigs. Typically, the reserved length 'a' at the well site is... 30 The length of the first side is between 100 and 150m, thus the calculated value is between 900 and 1000m.

[0056] Regarding the above S102, when constructing multiple horizontal well group basic units in the oil and gas resource area inside the source rock according to the size of each drilling area, the process implementation area in each horizontal well group basic unit overlaps with the target distance area and / or well site deployment area in other horizontal well group basic units, and the wellbore trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other.

[0057] Specifically, for example, the following method can be used to construct multiple horizontal well group basic units within the source rock's oil and gas resource area based on the size of each drilling area: The source rock's oil and gas resource area is divided into multiple square areas according to the size of each drilling area; the second side length of each square area is equal to the first side length of the process implementation area; each square area is divided into a process implementation area for one horizontal well group basic unit; the wellbore trajectories of the horizontal well groups corresponding to the process implementation areas in adjacent square areas are perpendicular to each other; based on the structure of the horizontal well group basic unit and the square area where each process implementation area is located, two target distance areas and two well site deployment areas are deployed corresponding to each process implementation area; the target distance area and well site deployment area corresponding to one process implementation area can overlap and be deployed within the square area corresponding to another process implementation area.

[0058] For example, such as Figure 7 The diagram shown is a schematic representation of a cross-connection method for basic units of a horizontal well group according to an embodiment of the present invention. Figure 7(1) In horizontal well group basic unit 1, 12 and 13 represent the drilling direction of the horizontal well, respectively. The area for oil and gas resource development is a specific stratum underground in the central process implementation area. The underground oil and gas resources in the target distance area on both sides and the well site deployment area cannot be developed. This deployment method will cause a waste of underground resources. For example, when two identical horizontal well group basic units 1 and 111 are connected in series, the following occurs: Figure 7 (2) The underground oil and gas resources in the dashed box area 112 (i.e., the target distance area and well site deployment area of ​​horizontal well group basic unit 1 and horizontal well group basic unit 111) cannot be exploited using special process development methods. Therefore, in order to solve this problem, in this embodiment of the invention, when two identical horizontal well group basic units 1 and horizontal well group basic units 111 are connected in series, another horizontal well group basic unit 113 (e.g., ...) can be deployed in a cross manner. Figure 7 As shown in (3), the well site deployment area and target distance area of ​​horizontal well group basic units 1 and 111 are specifically used as the process implementation area of ​​horizontal well group basic unit 113 for well placement. Moreover, the drilling direction of the horizontal well of horizontal well group basic unit 113 is different from that of horizontal well group basic units 1 and 12, avoiding the risk of well trajectory collision, thereby realizing the successful development of underground oil and gas resources in the well site deployment area and target distance area of ​​horizontal well group basic units 1 and 111. By analogy, when horizontal well group basic unit 113 is connected in series with another horizontal well group basic unit, the process implementation area of ​​another horizontal well group basic unit (such as the target distance area and well site deployment area of ​​the connected horizontal well group basic unit 113) is deployed above the target distance area and well site deployment area of ​​the horizontal well group basic unit 113 and the connected horizontal well group basic unit. Figure 7 As shown in (4)). And so on, such as Figure 8 As shown, multiple horizontal well group basic units are constructed in the oil and gas resource area inside the source rock. The process implementation area in each horizontal well group basic unit overlaps with the target distance area and / or well site deployment area in other horizontal well group basic units. The wellbore trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other.

[0059] In another embodiment of the present invention, for the remaining area where the oil and gas resources inside the source rock cannot be divided into square areas, the size of each drilling area in the horizontal well group basic unit is adjusted according to the size of the remaining area. Based on the adjusted size of the horizontal well group basic unit, the size of the remaining area, and the distribution of the horizontal well group basic units in the square area, the remaining area is divided into at least one horizontal well group basic unit with adjusted size.

[0060] Specifically, at the edge of the oil and gas resource area inside the source rock, horizontal well group basic units with asymmetric well site deployment area and target distance distribution area can be adopted according to the actual situation to save surface land use.

[0061] This approach can meet the need for deploying dense horizontal well groups in large areas of source rock formations, enabling the special technological development of oil and gas resources in source rock formations and improving the efficiency of oil and gas resource development. Compared with existing methods relying on traditional well placement, this avoids the risk of well trajectory intersections and also prevents resource waste caused by the inability to develop oil and gas in the well site deployment area and the target distance area.

[0062] This invention also provides a horizontal well group placement device, as described in the following embodiments. Since the principle by which this device solves the problem is similar to the horizontal well group placement method, the implementation of this device can refer to the implementation of the horizontal well group placement method; repeated details will not be elaborated further.

[0063] like Figure 9 The diagram shown is a schematic of a horizontal well group layout device provided in an embodiment of the present invention, including: a size calculation module 901 and a region division module 902; wherein,

[0064] The size calculation module 901 is used to determine the size of each drilling area based on the maximum build-up rate that the drilling tools can achieve and the well site area required for drilling operations; wherein, the drilling area includes: the target distance area where the build-up section of the wellbore trajectory of the horizontal well group is located, the well site deployment area where the vertical section of the wellbore trajectory of the horizontal well group is located, and the process implementation area where the horizontal section of the wellbore trajectory of the horizontal well group is located.

[0065] The region division module 902 is used to construct multiple horizontal well group basic units in the oil and gas resource area within the source rock according to the size of each drilling region. Each horizontal well group basic unit includes two target distance areas, two well site deployment areas, and one process implementation area. The two target distance areas in the horizontal well group basic unit are distributed on both sides of the process implementation area along the wellbore trajectory of the horizontal well group. A well site deployment area is distributed on the side of each target distance area away from the process implementation area along the wellbore trajectory of the horizontal well group. The process implementation area in each horizontal well group basic unit overlaps with the target distance areas and / or well site deployment areas in other horizontal well group basic units. The wellbore trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other.

[0066] In one possible implementation, the size calculation module is specifically used to determine the length of the target distance region based on the maximum build-up rate achievable by the drilling tool; determine the length of the well site deployment region based on the well site area required for drilling operations; and determine the first side length of the process implementation area, as well as the width of the target distance region and the width of the well site deployment region based on the length of the target distance region and the length of the well site deployment region. The process implementation area is square, the width of the target distance region and the width of the well site deployment region are equal to the first side length, and the length directions of the target distance region and the well site deployment region are parallel to the wellbore trajectory of the horizontal well group.

[0067] In one possible implementation, the size calculation module is specifically used to calculate the length of the target front distance region using the following formula:

[0068] a 20 =1719.75 / F max ;

[0069] Among them, a 20 F is the length of the area in front of the target; max This represents the maximum build-up rate achievable by the drilling tool.

[0070] In one possible implementation, the size calculation module is specifically used to calculate the first side length of the process implementation area using the following formula:

[0071] a 10 =2×(a) 20 +a 30 );

[0072] Among them, a 10 Let a be the length of the first side. 20 The length of the target front distance zone, a 30 The length of the well site deployment area.

[0073] In one possible implementation, the region division module is specifically used to divide the area containing oil and gas resources inside the source rock into multiple square regions according to the size of each drilling region; wherein the second side length of the square region is equal to the first side length of the process implementation region; each square region is divided into a process implementation region of a horizontal well group basic unit; wherein the wellbore trajectories of the horizontal well groups corresponding to the process implementation regions in adjacent square regions are perpendicular to each other; according to the structure of the horizontal well group basic unit and the square region where each process implementation region is located, two target distance regions and two well site deployment regions corresponding to each process implementation region are deployed; wherein the target distance region and well site deployment region corresponding to one process implementation region can be overlapped and deployed in the square region corresponding to another process implementation region.

[0074] In one possible implementation, the region division module is further configured to, for the remaining region where the edge of the oil and gas resource area inside the source rock cannot be divided into a square region, adjust the size of each drilling region in the horizontal well group basic unit according to the size of the remaining region, and divide the remaining region into at least one horizontal well group basic unit with adjusted size according to the adjusted size of the horizontal well group basic unit, the size of the remaining region, and the distribution of the horizontal well group basic units in the square region.

[0075] In one possible implementation, the well site deployment area is used for deploying wellheads of horizontal well groups; the process implementation area contains formations with oil and gas resources; the device further includes: a deployment module for deploying horizontal well groups in formations with oil and gas resources under the process implementation area; wherein the horizontal well group includes at least one of the following: special process wells, production wells, and auxiliary wells.

[0076] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described horizontal well group layout method.

[0077] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described horizontal well group placement method.

[0078] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described horizontal well group placement method.

[0079] In this embodiment of the invention, the dimensions of each drilling region are determined based on the maximum build-up rate achievable by the drilling tools and the well site area required for drilling operations. The drilling region includes: the target distance region where the build-up section of the wellbore trajectory of the horizontal well group is located; the well site deployment region where the vertical section of the wellbore trajectory of the horizontal well group is located; and the process implementation region where the horizontal section of the wellbore trajectory of the horizontal well group is located. Based on the dimensions of each drilling region, multiple horizontal well group basic units are constructed within the oil and gas resource area inside the source rock. Each horizontal well group basic unit includes two target distance regions, two well site deployment regions, and one process implementation region. The two target distance regions in each horizontal well group basic unit are distributed along the wellbore trajectory of the horizontal well group on both sides of the process implementation region. A well site deployment region is distributed along the side of each target distance region away from the process implementation region along the wellbore trajectory of the horizontal well group. The process implementation region in each horizontal well group basic unit overlaps with the target distance regions and / or well site deployment regions in other horizontal well group basic units, and the wellbore trajectories of the horizontal well groups in the process implementation regions of adjacent horizontal well group basic units are perpendicular to each other. In this way, by dividing the oil and gas resource area inside the source rock into multiple horizontal well group basic units, the process implementation area in one horizontal well group basic unit can overlap with the area formed by the target distance area and well site deployment area in other horizontal well group basic units. This ensures that the oil and gas resources under the area formed by the target distance area and well site deployment area in the horizontal well group basic unit can also be developed, thus achieving full development of the oil and gas resources under the source rock oil and gas resource area and reducing the waste of oil and gas resources. In addition, the well trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other, which can avoid the risk of well trajectory collision in the process implementation areas of adjacent horizontal well group basic units.

[0080] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0081] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0082] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0083] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0084] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method of group well placement for horizontal wells, characterized in that, The method comprises the following steps: determining the size of each drilling area according to the maximum build-up rate that can be achieved by the drilling tool and the well site area required by the drilling operation; wherein, the drilling area comprises: a target pre-distance area where the build-up section of the wellbore trajectory of the horizontal well group is located, a well site deployment area where the vertical section of the wellbore trajectory of the horizontal well group is located, and a process implementation area where the horizontal section of the wellbore trajectory of the horizontal well group is located; constructing a plurality of horizontal well group basic units in the area where the internal oil and gas resources of the source rock are located according to the size of each drilling area; wherein, each horizontal well group basic unit comprises two target pre-distance areas, two well site deployment areas, and one process implementation area; wherein, the two target pre-distance areas in the horizontal well group basic unit are distributed on both sides of the process implementation area along the wellbore trajectory of the horizontal well group, and one well site deployment area is distributed on the side of each target pre-distance area away from the process implementation area along the wellbore trajectory of the horizontal well group; the process implementation area in each horizontal well group basic unit overlaps with the target pre-distance area and / or the well site deployment area in other horizontal well group basic units, and the wellbore trajectories of the horizontal well groups in the process implementation areas of adjacent horizontal well group basic units are perpendicular to each other; constructing a plurality of horizontal well group basic units in the area where the internal oil and gas resources of the source rock are located according to the size of each drilling area, comprising: dividing the area where the internal oil and gas resources of the source rock are located into a plurality of square areas according to the size of each drilling area; wherein, the second side length of the square area is equal to the first side length of the process implementation area; dividing each square area into a process implementation area of one horizontal well group basic unit; wherein, the process implementation areas in adjacent square areas correspond to wellbore trajectories of horizontal wells that are perpendicular to each other; deploying two target pre-distance areas and two well site deployment areas corresponding to each process implementation area according to the structure of the horizontal well group basic unit and the square area where each process implementation area is located; wherein, the target pre-distance area and the well site deployment area corresponding to one process implementation area can be overlapped and deployed in the square area corresponding to another process implementation area; further comprising: for the remaining area at the edge of the area where the internal oil and gas resources of the source rock are located that cannot be divided into a square area, adjusting the size of each drilling area in the horizontal well group basic unit according to the size of the remaining area, dividing the remaining area into at least one horizontal well group basic unit with adjusted size according to the size of the adjusted horizontal well group basic unit, the size of the remaining area, and the distribution of the horizontal well group basic unit of the square area.

2. The horizontal well placement method of claim 1, wherein, determining the size of each drilling area according to the maximum build-up rate that can be achieved by the drilling tool and the well site area required by the drilling operation, comprising: determining the length of the target pre-distance area according to the maximum build-up rate that can be achieved by the drilling tool; determining the length of the well site deployment area according to the well site area required by the drilling operation; determining the first side length of the process implementation area and the width of the target pre-distance area and the width of the well site deployment area according to the length of the target pre-distance area and the length of the well site deployment area; The process implementation area is a square, the width of the target pre-distance area and the width of the well site deployment area are equal to the first side length, and the length direction of the target pre-distance area and the length direction of the well site deployment area are parallel to the well trajectory of the horizontal well group.

3. The horizontal well pattern fracturing method of claim 2, wherein, The length of the target pre-distance area is determined according to the maximum build-up rate that can be achieved by the drilling tool, and the length of the well site deployment area is determined according to the maximum build-up rate that can be achieved by the drilling tool. The length of the target pre-distance area is calculated by using the following formula: a 20 = 1719.75 / F max ; where a 20 is the length of the target pre-drag region; F max is the maximum build rate achievable by the drilling tool.

4. The horizontal well panel fracturing method as set forth in claim 2, wherein, The first side length of the process implementation area is determined according to the length of the target pre-distance area and the length of the well site deployment area, and the first side length of the process implementation area is calculated by using the following formula: The well site deployment area is used to deploy the wellhead of the horizontal well group. a 10 = 2 x (a 20 + a 30 ); where a 10 is the first side length, a 20 is the length of the target pre-distance zone, a 30 is the length of the well site deployment area.

5. The method of claim 1, wherein, The formation with oil and gas resources is located below the process implementation area. The method further comprises: The horizontal well group comprises at least one of the following: a special process well, a production well and an auxiliary well. The size calculation module is configured to determine the size of each drilling area according to the maximum build-up rate that can be achieved by the drilling tool and the well site area required by the drilling operation, wherein the drilling area comprises a target pre-distance area where the build-up section of the well trajectory of the horizontal well group is located, a well site deployment area where the vertical section of the well trajectory of the horizontal well group is located, and a process implementation area where the horizontal section of the well trajectory of the horizontal well group is located.

6. A horizontal well group well placement device, characterized by, The area division module is configured to construct a plurality of horizontal well group basic units in the area where the oil and gas resources are located inside the source rock according to the size of each drilling area, wherein each horizontal well group basic unit comprises two target pre-distance areas, two well site deployment areas and one process implementation area, wherein the two target pre-distance areas in the horizontal well group basic unit are distributed on both sides of the process implementation area along the well trajectory of the horizontal well group, and one well site deployment area is distributed on the side of each target pre-distance area away from the process implementation area along the well trajectory of the horizontal well group, the process implementation area in each horizontal well group basic unit overlaps with the target pre-distance area and / or the well site deployment area in other horizontal well group basic units, and the well trajectory of the horizontal well group in the process implementation area of adjacent horizontal well group basic units is perpendicular to each other. The area division module is specifically configured to divide the area where the oil and gas resources are located inside the source rock into a plurality of square areas according to the size of each drilling area, wherein the second side length of the square area is equal to the first side length of the process implementation area, each square area is divided into the process implementation area of one horizontal well group basic unit, the process implementation areas in adjacent square areas correspond to well trajectories of horizontal wells that are perpendicular to each other, and two target pre-distance areas and two well site deployment areas corresponding to each process implementation area are deployed according to the structure of the horizontal well group basic unit and the square area where each process implementation area is located, wherein the target pre-distance area and the well site deployment area corresponding to one process implementation area can be overlapped and deployed in the square area corresponding to another process implementation area. ​ ​ The area division module is further configured to: for a remaining area at an edge of an area where the oil and gas resources in the source rock are located, which cannot be divided into a square area, adjust the size of each drilling area in the horizontal well group basic unit according to the size of the remaining area, and divide the remaining area into at least one adjusted-size horizontal well group basic unit according to the size of the adjusted-size horizontal well group basic unit, the size of the remaining area, and the distribution of the square area.

7. The horizontal well group well placement apparatus of claim 6, wherein, The size calculation module is specifically configured to determine the length of the target pre-distance area according to a maximum build-up rate that can be achieved by a drilling tool. The length of the well site deployment area is determined according to the well site area required by drilling operations. The first side length of the process implementation area and the width of the target pre-distance area are determined according to the length of the target pre-distance area and the length of the well site deployment area. The process implementation area is a square, the width of the target pre-distance area and the width of the well site deployment area are equal to the first side length, and the length direction of the target pre-distance area and the length direction of the well site deployment area are parallel to the borehole trajectory of the horizontal well group.

8. The horizontal well group well placement device of claim 7, wherein, The size calculation module is specifically configured to calculate the length of the target pre-distance area by using the following formula: a 20 = 1719.75 / F max ; where a 20 is the length of the target pre-drag region; F max is the maximum build rate achievable by the drilling tool.

9. The horizontal well group well placement device of claim 7, wherein, The size calculation module is specifically configured to calculate the first side length of the process implementation area by using the following formula: a 10 = 2 x (a 20 + a 30 ); where a 10 is the first side length, a 20 is the length of the target pre-distance zone, a 30 is the length of the well site deployment area.

10. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the method of any one of claims 1 to 5 when executing the computer program.

11. A computer readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program is executed by the processor to implement the method of any one of claims 1 to 5.

12. A computer program product, characterised in that, The computer program product includes a computer program, and the computer program is executed by the processor to implement the method of any one of claims 1 to 5.

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