A method of drilling a well for the extraction of shale oil and gas resources and a horizontal well cluster

Abstract

The application discloses a shale oil and gas resource exploitation drilling method and a horizontal well group. The shale oil and gas resource exploitation drilling method obtains well tracks of heating horizontal wells and production horizontal wells in a designed horizontal well group, wherein the well track comprises wellhead coordinates of corresponding horizontal wells, and the wellhead coordinates are designed according to a minimum well spacing principle; each horizontal well is drilled to a set depth according to the well track, and the set depth is located at the top of a reservoir where shale oil and gas resources are located; and each horizontal well is drilled from the set depth to a well bottom according to the well track. The shale oil and gas resource exploitation drilling method disclosed by the application reduces the well wall instability risk in the process of drilling the dense horizontal well.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas drilling technology, and particularly relates to a shale oil and gas resource exploitation drilling method and a horizontal well group. BACKGROUND

[0002] With the increasing demand for oil and gas, oil and gas exploration and development gradually enters a new field of "source rock oil and gas". The exploration and development of "source rock oil and gas" need to solve the problem of flowability of hydrocarbon substances and the problem of whether the seepage channel of the hydrocarbon substances in the stratum is unobstructed. In order to solve this problem, shale oil in-situ conversion technology can be used, that is, through heating, immature hydrocarbon substances in the shale stratum are converted in-situ, and the flowability of the hydrocarbon substances is improved. SUMMARY

[0003] The inventors find that in order to realize shale oil in-situ heating, a large number of dense horizontal boreholes need to be drilled in the shale series to better arrange heat sources and form an effective heat field. Due to the large number of dense boreholes, the operation time is long, and the drilling fluid is soaked in the horizontal well section for a long time during the drilling process, so the risk of wellbore instability is large. Once the wellbore is unstable, a large amount of time is needed to deal with the accident, which affects the operation efficiency and even cannot complete the drilling operation, resulting in project scrap.

[0004] In order to at least partially solve the technical problems existing in the prior art, the inventors make the present application, and through specific embodiments, provide a shale oil and gas resource exploitation drilling method and a horizontal well group, which reduces the risk of wellbore instability in the drilling process of the shale oil and gas resource dense horizontal well.

[0005] In a first aspect, an embodiment of the present application provides a shale oil and gas resource exploitation drilling method, comprising:

[0006] obtaining well tracks of heating horizontal wells and production horizontal wells in a designed horizontal well group, wherein the well tracks comprise wellhead coordinates corresponding to the horizontal wells, and the wellhead coordinates are designed according to a minimum well spacing principle;

[0007] drilling each horizontal well to a set depth according to the well tracks, wherein the set depth is located at the top of a reservoir where shale oil and gas resources are located;

[0008] drilling each horizontal well from the set depth to a well bottom according to the well tracks.

[0009] In some embodiments, the wellhead coordinates are designed according to at least one of the following requirements:

[0010] requirements of an exploration and development process, requirements of a horizontal well spacing measurement device, requirements of a drilling rig movement, and requirements of a ground condition.

[0011] In some embodiments, the requirements of the exploration and development process specifically include:

[0012] The distance between the wellhead of the heating horizontal well and the production horizontal well is not less than the first distance threshold.

[0013] In some embodiments, the drilling each horizontal well to the set depth according to the well track specifically includes:

[0014] Using one or more drilling rigs, drilling the current horizontal well to the set depth according to the first set sequence until each horizontal well in the designed horizontal well group is drilled to the set depth.

[0015] In some embodiments, the drilling each horizontal well from the set depth to the well bottom according to the well track specifically includes:

[0016] Drilling the current horizontal well from the set depth to the well bottom according to the well track in sequence according to the second set sequence until each horizontal well in the designed horizontal well group is drilled to the well bottom.

[0017] In some embodiments, the method further includes:

[0018] Obtaining the wellbore structure of the heating horizontal well and the production horizontal well in the designed horizontal well group, the wellbore structure including at least two open times;

[0019] Correspondingly, the drilling each horizontal well from the set depth to the well bottom according to the well track specifically includes:

[0020] Drilling the current horizontal well from the set depth to the well bottom according to the well track and the wellbore structure according to the second set sequence, completing the last open time according to the set completion method, and drilling the next horizontal well from the set depth to the well bottom according to the well track and the wellbore structure until each horizontal well in the designed horizontal well group is completed.

[0021] In some embodiments, the completion method is designed in advance according to at least one of the following factors:

[0022] Formation wellbore stability, specific heating method of the horizontal well, and drilling steering technology.

[0023] In some embodiments, the completion method is open hole completion or lower reservoir casing or screen pipe.

[0024] In some embodiments, the wellheads of the heating horizontal well and the production horizontal well in the designed horizontal well group are arranged in a straight line or a matrix.

[0025] In some embodiments, the method further includes:

[0026] The drilling fluid used for drilling the horizontal well to the set depth according to the well track and the drilling fluid used for drilling the horizontal well from the set depth to the well bottom according to the well track have the set requirements in inhibition, water loss, plugging, and lubrication.

[0027] In a second aspect, the embodiments of the present application provide a shale oil and gas resource exploitation horizontal well group drilled according to the shale oil and gas resource exploitation drilling method.

[0028] The beneficial effects of the above technical solution provided by the embodiments of the present application at least include:

[0029] (1) The shale oil and gas resource exploitation drilling method provided by the embodiments of the present application obtains the well track of the heating horizontal well and the production horizontal well in the designed horizontal well group, and the setting of the heating horizontal well can realize in-situ heating of the shale oil; the well track of the well head coordinates of the horizontal well included therein is designed according to the minimum well spacing principle, which can reduce the drilling land area and save costs, and facilitate drilling construction; in addition, the heat source can be better arranged to form an effective heat field.

[0030] (2) The existing single-well sequential operation mode needs to complete drilling operation one well at a time, and this operation mode has the following risks: the horizontal well section of the well completed in the early stage is always in contact with the wellbore drilling fluid, and the exposed time of the horizontal well section of each well completed drilling operation is the total of the subsequent drilling operation time of the horizontal well, which is likely to cause large-area well wall collapse and affect the safety of subsequent drilling operation. The shale oil and gas resource exploitation drilling method provided by the embodiments of the present application first drills each horizontal well to the set depth according to the well track, and specifically, after drilling to the top of the shale oil and gas resource reservoir, each horizontal well is drilled from the set depth to the well bottom according to the well track, which separates the horizontal well section drilling operation from the drilling operation of the formation above the top of the reservoir, and completes the drilling operation of the formation above the top of the reservoir first, and then completes the drilling operation of the horizontal well section, which greatly shortens the contact time of the horizontal well section formation well wall and the drilling fluid, thereby reducing the risk of well wall collapse and instability of the drilling operation, improving the downhole safety of the intensive horizontal well drilling operation, and ensuring the drilling operation efficiency.

[0031] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

[0032] The technical solutions of the present application will be further described in detail below by means of the accompanying drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0033] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate embodiments of the present application, and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0034] Figure 1 A flow chart of the shale oil and gas resource exploitation drilling method in the embodiment of the present application;

[0035] Figure 2 A wellhead deployment schematic of the horizontal well group in the embodiment of the present application;

[0036] Figure 3 A well profile schematic in the embodiment of the present application;

[0037] Figure 4 A schematic diagram after the drilling operation of all the reservoirs above the well section in the horizontal well group is completed in the embodiment of the present application;

[0038] Figure 5 A schematic diagram after the drilling operation of the horizontal well section in the horizontal well group is completed in the embodiment of the present application. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms without being limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and so that the scope of the present disclosure can be completely conveyed to those skilled in the art.

[0040] It should be understood that the terms used in the present application merely describe particular embodiments and are not intended to limit the present application. In addition, for numerical ranges in the present application, it should be understood that each intermediate value between the upper limit and the lower limit of the range is also specifically disclosed. Each smaller range within the range of the stated value or the intermediate value within the range and any other stated value or intermediate value within the range is also included in the present application. The upper limit and the lower limit of these smaller ranges can be independently included or excluded from the range.

[0041] In the description of the present application, it should be noted that the terms "comprise", "include", "have", "contain", and the like are all open terms, which means to include but not limited to. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In order to solve the problem of easy wellbore instability in the drilling process of shale oil and gas resource intensive horizontal wells in the prior art, the embodiments of the present application provide a shale oil and gas resource exploitation drilling method and a horizontal well group, which reduces the risk of wellbore instability in the drilling process of shale oil and gas resource intensive horizontal wells.

[0043] Embodiment one

[0044] The embodiment one of the present application provides a shale oil and gas resource exploitation drilling method, a flowchart of which is shown in the figure Figure 1 as follows:

[0045] Step S11: obtaining well tracks of heating horizontal wells and production horizontal wells in a designed horizontal well group.

[0046] The well track comprises wellhead coordinates corresponding to the horizontal wells.

[0047] The horizontal wellbore spacing between the horizontal wells in the target zone of a conventional oil and gas well is generally above 100 m, while the horizontal well spacing between the heating horizontal wells and the production horizontal wells in the shale oil and gas resource is generally only tens of meters or even a few meters in the target zone, which belongs to intensive distribution.

[0048] The heating horizontal wells and the production horizontal wells in the designed horizontal well group can be branch wells in a cluster well group.

[0049] The cluster well group refers to drilling multiple horizontal wells on one well site or platform, the wellheads of the wells are close to each other, the well bottoms of the wells extend to different directions, and the well group is composed of multiple horizontal wells. The branch well mode of the cluster well group can save the land occupation and concentrate the wellheads in a reasonable range.

[0050] In the embodiment, the wellhead coordinates of the heating horizontal wells and the production horizontal wells in the designed horizontal well group are designed according to the minimum well spacing principle. The wellheads connecting the intensive horizontal wells in the reservoir are arranged on a relatively concentrated drilling platform.

[0051] Generally, the underground target point of the horizontal well is determined by the geologic reservoir personnel according to the geologic research results, and the wellbore track connecting the wellhead of the underground target point can be designed according to the horizontal wellbore track design method. In order to improve the operation efficiency, reduce the ground engineering operation range, and facilitate the drilling operation, the wellbore track design gives priority to concentrating all the wellheads of the intensive horizontal wells in the reservoir in a limited range, i.e. the drilling platform.

[0052] The area of the drilling platform can be larger than the range occupied by the intensive horizontal wells, or smaller than the range occupied by the intensive horizontal wells. For example, if the well spacing of the intensive horizontal wells is within 10 m, the area of the drilling platform can be larger than the range occupied by the intensive horizontal wells; if the well spacing of the intensive horizontal wells is more than 10 m, the area of the drilling platform can be smaller than the range occupied by the intensive horizontal wells.

[0053] In the traditional mode, the segment spacing of the horizontal segments in the horizontal well group is generally above 150 m, which is larger than the wellhead spacing; in the embodiment, the segment spacing of the horizontal segments can be larger than or smaller than the wellhead spacing.

[0054] Further, the wellhead coordinates of the heating horizontal well and the production horizontal well in the horizontal well group are designed according to at least one of the following requirements:

[0055] (1) The requirement of exploration and development technology

[0056] The special requirement of different exploration and development technologies implemented by the dense horizontal well is that part of the horizontal wells are heating wells and part of the wells are production wells. In order to reduce the interference between the heating wells and the production wells, the wellheads of the two in the dense horizontal well group need to be isolated by a certain distance. The distance between the wellheads of the heating horizontal well and the production horizontal well is not less than a first distance threshold.

[0057] Generally, the first distance threshold is 15 m, and it can also be set to other values according to different heating technologies.

[0058] (2) The requirement of horizontal well spacing measurement device

[0059] The special requirement of the dense horizontal well spacing measurement device is that in order to complete the drilling operation of the dense horizontal well, ensure the spatial distance and relative position between each other, and real-time measure the distance and position between the to-be-drilled well and the drilled well, the distance between the wellheads of the to-be-drilled well and the drilled well has certain requirements, such as not less than 10 m.

[0060] (3) The requirement of drilling rig movement

[0061] The special requirement of the drilling rig movement is that the distance between different wellheads is as small as possible to facilitate the translation of the drilling rig and improve the operation efficiency.

[0062] (4) The requirement of ground conditions

[0063] The special requirement of the ground conditions is that the ground environment has special requirements, such as villages, hills, rivers, swamps, surface buildings, etc. which will affect the layout of the wellhead area of the dense wellbore. The limited range of wellhead deployment needs to be determined considering the restrictions of the ground conditions.

[0064] In order to facilitate the translation of the drilling rig and increase the efficiency of drilling, the wellheads of all the dense wellbores are arranged on one or more straight lines as much as possible. The wellheads of the heating horizontal well and the production horizontal well in the horizontal well group are designed to be arranged in a straight line or a matrix type.

[0065] For example, Figure 2As shown in the figure, it is a schematic diagram of wellhead deployment of a dense horizontal well group for shale oil and gas resource exploitation, wherein 1 is a drilling platform range, 11 is a horizontal wellhead, further, 111 is a heating horizontal wellhead, and 112 is a production horizontal wellhead. The distance L1 between 111 and 112 in different rows is to meet the requirements of the horizontal well spacing measurement device in the drilling guide operation; and the distance L2 between 111 and 112 is to meet the spacing requirements between the heating well and the production well.

[0066] In some embodiments, in addition to obtaining the well track of the heating horizontal well and the production horizontal well in the designed horizontal well group, the well structure of the heating horizontal well and the production horizontal well in the designed horizontal well group also needs to be obtained.

[0067] The well structure of each horizontal well at least includes two openings, the first opening is to run a surface casing, and the last opening is to run a reservoir casing (tail pipe) / screen pipe or open hole completion. According to the complexity of the formation, a technical casing can be run in the middle.

[0068] The well structure of three openings or more openings can be designed according to the geological complexity of the drilled formation. The wellbore stability of the upper formation of the reservoir can be evaluated to determine that under the premise of ensuring that accidents and complications caused by wellbore instability will not occur within the time of completing the entire dense horizontal well group drilling operation, a technical casing does not need to be run at the top of the reservoir, at this time, the well structure of the dense horizontal well is at least two openings; otherwise, a technical casing must be run at the top of the reservoir, at this time, the well structure of the dense horizontal well is at least three openings.

[0069] Referring to Figure 3 As shown in the figure, it is a schematic diagram of well structure, the well body 2 includes four openings, the first opening 21 is to run a surface casing, and the last opening 22 is to run a reservoir casing (tail pipe) / screen pipe or open hole completion; there are two openings 23 and 24 in the middle to run a technical casing. Figure 3 and subsequent Figure 4 and Figure 5 It is only a schematic diagram of well structure, and the horizontal section is simplified as a straight well section.

[0070] Step S12: drilling each horizontal well to a set depth according to the well track.

[0071] The set depth is located at the top of the reservoir where the shale oil and gas resource is located.

[0072] Using one drilling rig or multiple drilling rigs to operate simultaneously, according to the first set sequence, drilling the current horizontal well to the set depth according to the well track, until each horizontal well in the designed horizontal well group is drilled to the set depth, that is, all the horizontal wells complete the drilling operation of the formation above the top of the reservoir.

[0073] The first setting sequence is generally from front to back, one well after another, one row after another, according to the deployment of wellhead positions, and multiple drilling machines are operated simultaneously. Considering the requirement of drilling machine movement, for example, two drilling machines can be operated simultaneously from two ends.

[0074] The drilling operation of all well sections above the reservoirs in the intensive horizontal well is completed in a centralized manner. If technical casing needs to be lowered in the well structure of the intensive horizontal well at the top of the reservoir, the casing is lowered and cementing operation is performed, and the cement slurry is returned to the ground first. If technical casing does not need to be lowered in the well structure of the intensive horizontal well at the top of the reservoir, the technical casing is not needed to be lowered, and the performance of the drilling fluid is treated.

[0075] Referring to Figure 4 FIG. 4 shows a schematic diagram after the drilling operation of all well sections above the reservoirs in the intensive horizontal well is completed in a centralized manner.

[0076] Step S13: According to the well track, each horizontal well is drilled from the set depth to the well bottom.

[0077] According to the second setting sequence, the current horizontal well is drilled from the set depth to the well bottom according to the well track, and this process is repeated until all the horizontal wells in the designed horizontal well group are drilled to the well bottom.

[0078] Further, according to the second setting sequence, the current horizontal well is drilled from the set depth to the well bottom according to the well track and the well structure, the last spud is completed according to the set completion method, the next horizontal well is drilled from the set depth to the well bottom according to the well track and the well structure, and this process is repeated until all the horizontal wells in the designed horizontal well group are completed.

[0079] Since the distance between the horizontal sections of the horizontal well is relatively short, the spatial distance and relative position between the currently drilled horizontal section and the drilled horizontal section need to be measured at any time during the drilling of the horizontal section to prevent the drilling trajectory from intersecting. Therefore, during the process of drilling each horizontal well from the set depth to the well bottom, the operation needs to be performed well by well and section by section.

[0080] The second setting sequence is generally from front to back, one well after another, one row after another, according to the deployment of wellhead positions.

[0081] The completion method of the last spud is to lower the reservoir casing or screen pipe, or to complete the well in a bare hole. The specific completion method is designed in advance according to at least one of the following factors:

[0082] The stability of the well wall of the formation, the specific heating method of the horizontal well, and the drilling guide technology.

[0083] Generally, in the case of good stability of the well wall of the formation, short horizontal section of the horizontal well, and easy and safe lowering of the heater, the completion method of the well in a bare hole can be considered; in the case of poor stability of the well wall of the formation and problems in the safe lowering of the heater, the completion method of the well with a screen pipe can be considered.

[0084] Referring to Figure 5 As shown in the figure, it is a schematic view after drilling operation of the horizontal well section in the concentrated drilling of the dense horizontal well.

[0085] The shale oil and gas resource exploitation drilling method provided by the embodiment of the present application acquires the well track of the heating horizontal well and the production horizontal well in the designed horizontal well group, and the setting of the heating horizontal well can realize in-situ heating of the shale oil; the well track includes the wellhead coordinates of the horizontal well designed according to the minimum well spacing principle, which can reduce the drilling area and save the cost, and facilitate the drilling construction; in addition, the heat source can be better arranged to form an effective heat field.

[0086] The existing single-well sequential operation mode needs to complete drilling operation well by well, and this operation mode has the following risks: the horizontal well section of the well completed in the early stage is always in contact with the wellbore drilling fluid, and the exposed time of the horizontal well section of each well completed drilling operation is the total of the subsequent drilling operation time of the horizontal well, and this long-time soaking in the drilling fluid can easily lead to instability of the horizontal well section wall, and the small spacing between the wellbores can possibly cause large-area wall collapse, affecting the safety of the subsequent drilling operation. The shale oil and gas resource exploitation drilling method provided by the embodiment of the present application first drills each horizontal well to the set depth according to the well track, and specifically, after drilling to the top of the shale oil and gas resource reservoir, each horizontal well is drilled from the set depth to the well bottom according to the well track, which separates the drilling operation of the horizontal well section and the drilling operation of the formation above the top of the reservoir, and first completes the drilling operation of the formation above the top of the reservoir and then completes the drilling operation of the horizontal well section, which greatly shortens the contact time of the horizontal well section wall and the drilling fluid, thereby reducing the risk of wall collapse instability of the drilling operation, improving the downhole safety of the drilling operation of the dense horizontal well, and ensuring the drilling operation efficiency.

[0087] Further, the drilling fluid performance and the drilling construction process need to be optimized in the process of the above-mentioned concentrated drilling operation of the formation above the top of the reservoir and the concentrated drilling operation of the horizontal well section.

[0088] The optimization of the horizontal wellbore drilling fluid performance includes that the inhibition, water loss, plugging and lubricity of the drilling fluid meet the set requirements. The inhibition of the drilling fluid is improved by adding strong inhibition materials to prevent excessive hydration of the clay components in the formation; the water loss of the drilling fluid is reduced to ensure that the water activity of the drilling fluid is approximately equal to that of the formation water; the plugging of the drilling fluid is improved to prevent the drilling fluid from invading the deep formation; and a lubricant is added to reduce the drilling friction and torque.

[0089] The drilling fluid can be an oil-based drilling system or a water-based drilling fluid system. The water-based drilling fluid system is preferred, and whether the oil-based or water-based drilling fluid is used can be selected flexibly according to the site construction condition and construction requirement.

[0090] The optimization of the horizontal well section drilling construction process comprises: ① selecting high-performance drilling equipment, so that the drilling machine has good drilling operation capacity, such as adopting an electric drilling machine, being equipped with a drilling top drive, and improving the power of the drilling pump to more than 1600 horsepower; ② strengthening the design of the horizontal well section drilling parameters within the equipment capacity, drilling with high pump pressure (more than 25 MPa), large displacement (more than 35 L / min for an 8 1 / 2 well hole), high drilling pressure (more than 6 tons for a PDC drill bit for an 8 1 / 2 well hole), and high rotation speed (more than 80 rpm); ③ drilling in a manner conducive to reducing the drilling frictional resistance and torque, such as drilling with a rotary steering tool, drilling with long-life high-power screw drill tools, and drilling with anti-friction and torque reduction joints; and ④ optimizing the drill tool structure to improve the energy transmission efficiency of the drill tool and reduce the bending risk of the drill tool, such as adopting an inverted drill tool structure, and optimizing the bottom hole assembly structure and parameters to improve the well hole track control efficiency of the drill tool.

[0091] Further, after the drilling operation of the horizontal well group is completed, the intensive horizontal well test production operation is quickly completed.

[0092] According to the operation requirements of the intensive horizontal well part heating well and part production well, a heating or oil production pipe string is run in, and pipe string pressure test and pipe string sealing operation are performed.

[0093] Based on the inventive concept of the present application, the embodiments of the present application also provide a shale oil and gas resource exploitation horizontal well group, which is drilled according to the above shale oil and gas resource exploitation drilling method.

[0094] It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary methods. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes can be rearranged while remaining within the scope of the present disclosure. The accompanying method claims present elements of the various steps in exemplary order and are not intended to be limited to the specific order or hierarchy presented.

[0095] In the above detailed description, various features are grouped together in single embodiments for the purpose of streamlining the disclosure. Such disclosed methods should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as the claims follow the detailed description, the inventive subject matter lies in less, not more, than all features described in the single disclosure embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment of this application.

[0096] The above description includes examples of one or more embodiments. Of course, not all possible combinations of components or methods described above can be claimed as an embodiment, but one of ordinary skill in the art will recognize that many such further combinations and permutations of the embodiments described are possible. Accordingly, the described embodiments are intended to embrace all such alterations, modifications and variations which fall within the scope of the appended claims. Additionally, where the description or the claims recite "a", "an" or a "the" one or more of elements, this does not exclude multiple numbers for this element. Further, where the description or the claims recite that an element can or can not be used, this indicates that the element is optional. Additionally, the use of "a" or "an" or "the" preceding an element does not exclude the presence of more than one of the element. Further, the description or the claims can include a plurality of means plus function components consisting of a specific combination of means. The method or process of claims can be implemented by one or more processors or one or more processors in one or more machines where the one or more machines can each comprise one or more processors. The description or the claims can further include a plurality of identifying steps consisting of a specific combination of steps. The machine can be configured to perform the methods or processes of the claims by one or more processors disposed in the machine.

Claims

1. A drilling method for shale oil and gas resource extraction, characterized in that, include: Obtain the well tracks of the heated horizontal well and the production horizontal well in the designed horizontal well group. The well tracks include the wellhead coordinates of the corresponding horizontal wells. The wellhead coordinates are designed according to the minimum well spacing principle and at least one of the following requirements: the requirements of exploration and development technology, the requirements of the horizontal well spacing measuring device, the requirements of drilling rig movement, and the requirements of ground conditions. The requirements of exploration and development technology include that the distance between the wellheads of the heated horizontal well and the production horizontal well is not less than a first distance threshold. One or more drilling rigs can be used to work simultaneously. According to the first set sequence, the current horizontal well is drilled to the set depth according to the well trajectory until all horizontal wells in the designed horizontal well group are drilled to the set depth. The set depth is located at the top of the reservoir where the shale oil and gas resources are located. Obtain the wellbore structure of the heated horizontal well and the production horizontal well in the designed horizontal well group, wherein the wellbore structure includes at least two openings; According to the second set sequence, the current horizontal well is drilled from the set depth to the bottom of the well in sequence according to the well track and well body structure. The last opening is completed according to the set completion method. The next horizontal well is drilled from the set depth to the bottom of the well in sequence according to the well track and well body structure until all horizontal wells in the designed horizontal well group are completed.

2. The method as described in claim 1, characterized in that, The well completion method is pre-designed based on at least one of the following factors: Formation wellbore stability, specific heating methods for horizontal wells, and drilling guidance technology.

3. The method as described in claim 1, characterized in that, The well completion method is either casing or screen pipe under the oil layer, or open hole completion.

4. The method according to any one of claims 1 to 3, characterized in that, In the designed horizontal well group, the wellheads of the heating horizontal wells and the production horizontal wells are arranged in a straight line or matrix.

5. The method according to any one of claims 1 to 3, characterized in that, Also includes: The drilling fluid used to drill a horizontal well to a set depth according to the well trajectory, and the drilling fluid used to drill a horizontal well from a set depth to the bottom of the well according to the well trajectory, meet the set requirements in terms of inhibition, water loss, plugging and lubrication.

6. A horizontal well group for shale oil and gas resource development, characterized in that, The horizontal well group was drilled according to the method described in any one of claims 1 to 5.

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