A shale gas platform well track design method and system

Abstract

The application provides a shale gas platform well track design method and system, which comprises the following steps: firstly, based on the obtained platform well related geological stratum data, target point vertical depth data and guiding tool capacity information, combining three-dimensional horizontal well track design technology and drilling speed-up technology requirements, key elements of platform single well track design are determined; then, according to the angle between the data of platform same side wellhead connecting line and horizontal section azimuth line, a matching optimization strategy is formulated to realize wellhead layout optimization; finally, based on the optimized wellhead layout, multi-well track design is implemented simultaneously according to the key elements of single well track design in the platform mode. The scheme simultaneously considers the optimization characteristics of various track design elements, guarantees the accuracy and practical performance of single well track design effect, guarantees the minimum collision risk while significantly shortening the total drilling footage, and realizes the simultaneous construction of each well according to the synchronous track design of the overall platform mode, thereby guaranteeing the completion efficiency of all wells.

Description

Technical Field

[0001] This invention relates to the field of drilling trajectory design and optimization technology, and in particular to a method and system for shale gas platform well trajectory design. Background Technology

[0002] The Sichuan Basin and its surrounding areas are the most favorable regions for shale gas accumulation in my country. In recent years, exploration and development in blocks such as Changning-Weiyuan and Luzhou, as well as in blocks such as Fuling, Weirong, and Yongchuan, have basically achieved effective development of medium-deep shale gas with a vertical depth of less than 3500m. However, for deep shale gas with a vertical depth greater than 3500m, due to the hilly and mountainous terrain of the work areas, in order to reduce surface engineering costs and improve the overall development efficiency of shale gas, platform wells are usually adopted, using "well factory" technology. Most of the deployed wells have their wellheads and target points not on the same straight line, and are all three-dimensional horizontal wells, characterized by large burial depth and large lateral displacement. This makes the wellbore trajectory design complex and affects geological target positioning and horizontal trajectory control during drilling.

[0003] Currently, in the design of 3D horizontal well trajectories, researchers have conducted relevant studies on trajectories and design methods. Existing technologies have proposed optimization approaches that target individual factors such as reducing drilling difficulty, minimizing total trajectories length, and minimizing drilling and completion costs. However, these approaches are limited to geometric trajectories designed under a single-well construction mode. For deep shale gas, due to the adoption of a platform well model with 6-12 wells deployed on a single platform, it is difficult to efficiently achieve the optimal wellbore trajectories for the entire platform using the aforementioned single-factor trajectories design methods. This approach cannot adequately meet the construction requirements of accelerating drilling and increasing reservoir penetration rates in the horizontal section of the shale gas platform.

[0004] The information disclosed in the background section of this invention is intended only to enhance the understanding of the general background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a shale gas platform well trajectory design method. This method introduces a platform design pattern, employs an optimized wellhead layout and key trajectory design elements, and designs the trajectory for the entire platform, achieving optimal trajectory design for the entire platform. In one embodiment, the method includes: The steps for determining design elements include: obtaining geological and stratigraphic data, target depth data, and directional tool capability information for each platform well in the shale gas development area; and formulating key elements for the single-well trajectory design of the platform according to the initial wellhead number and the requirements of three-dimensional horizontal well trajectory design technology and drilling speed-up technology. The wellhead layout optimization steps include: collecting data on the connection lines of wellheads on the same side of the platform; and formulating matching optimization strategies based on the angle between the connection lines and the horizontal azimuth line to adjust the wellhead layout. The platform track design steps, based on the adjusted wellhead layout, involve simultaneously implementing multi-well track design for the platform mode according to the key elements of single-well track design.

[0006] Furthermore, in the design element determination step, the key elements of the platform single-well track design include the track profile type; Based on the obtained target parameters and the wellhead coordinates of the platform's single well, a three-dimensional horizontal well trajectory design is carried out to select the trajectory profile type suitable for the current platform's single well.

[0007] In one embodiment, three-dimensional horizontal well track design technology is used to select dual two-dimensional and / or two-dimensional + small three-dimensional as the single-well track profile type of the platform.

[0008] Preferably, in one embodiment, in the design element determination step, based on the acquired geological stratification data and combined with drilling speed-up technology profile technology, the correlation between the trajectory design start point and rock drillability is analyzed, and the available start point locations are proposed.

[0009] Specifically, in one embodiment, in the design element determination step, using the acquired target vertical depth data, and according to the geological steering process and trajectory adjustment requirements, based on the correlation between the prediction accuracy of the underground target vertical depth and the build-up rate, the build-up rate corresponding to the available target vertical depth prediction accuracy is proposed as the available single-well trajectory design build-up rate; based on the correlation between the steering tool capability and the azimuth well section parameters, the matching azimuth well section corresponding to the available steering tool capability is proposed as the available azimuth well section of the current platform well.

[0010] Furthermore, in one embodiment, during the wellhead layout optimization step, Platform wells with an angle of 0-45° or 135-180° between the wellhead azimuth line and the horizontal azimuth line are selected. Based on the objectives of minimizing the probability of collision on the entire platform track and minimizing the total drilling footage, the optimized wellhead number of the corresponding platform well is calculated and selected to replace the initial wellhead number.

[0011] In a specific embodiment, the analysis of the correlation between the designed descent point and rock drillability includes: The location of the build-up point is designed by combining the well inclination angle and the bottom hole displacement, so that the vertical well section or the stable inclination section mode can penetrate the formation with a high drillability value.

[0012] Furthermore, in the design element determination step, taking into account the characteristic that the greater the well inclination, the weaker the azimuth adjustment capability of the steering tool, and in accordance with the trajectory adjustment requirements that increasing the build-up rate and shortening the target distance when the vertical depth is shallower and increasing the target distance when the vertical depth is deeper, the build-up rate is optimized, and an upper-large and lower-small mode is adopted. If the well inclination is greater than 60°, the azimuth adjustment of the corresponding well section is set as the upper limit value of the azimuth adjustment.

[0013] Based on the methods described in any one or more of the above embodiments, the present invention also provides a storage medium storing program code that can implement the methods described in any one or more of the above embodiments.

[0014] Based on other aspects of the methods described in any one or more of the above embodiments, the present invention also provides a shale gas platform well trajectory design system that performs the methods described in any one or more of the above embodiments.

[0015] Compared with the closest prior art, the present invention also has the following beneficial effects: This invention provides a shale gas platform well trajectory design method and system. The method first determines the key elements of the single-well trajectory design based on the acquired geological and stratigraphic data, target point vertical depth data, and steering tool capability information of the platform well, combined with the requirements of three-dimensional horizontal well trajectory design technology and drilling speed-up technology. At the same time, it considers the optimization characteristics of multiple trajectory design elements, ensuring the accuracy and practicality of the single-well trajectory design effect, and significantly shortening the total drilling footage while ensuring the lowest collision risk. Furthermore, based on the angle between the data of the wellhead connection line on the same side of the platform and the azimuth line of the horizontal section, a matching optimization strategy was formulated to optimize the wellhead layout. Wells with optimization needs were selected for targeted optimization based on the angle data, ensuring the reliability of the results while avoiding the waste of time and resources caused by blind optimization. On this basis, based on the optimized wellhead layout, multi-well track design was carried out synchronously in the platform mode according to the key elements of track design. Track synchronous design was carried out according to the overall platform mode to realize synchronous construction of each well, further improving the completion efficiency of all wells and saving drilling cycle and well construction costs.

[0016] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart illustrating a shale gas platform well trajectory design method provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of the well network deployment of shale gas platforms in the southern Sichuan working area provided in one embodiment of the present invention; Figure 3 This is a diagram of the wellhead double-row layout before optimization of the shale gas platform well track design method in one embodiment of the present invention; Figure 4 This is an optimized double-row layout diagram of the wellhead of a shale gas platform well track design method according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the shale gas platform well trajectory design system provided in an embodiment of the present invention. Detailed Implementation

[0018] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples. Those skilled in the art will then fully understand how the present invention uses technical means to solve technical problems and achieve technical effects, and will be able to implement the present invention specifically based on the above-described implementation process. It should be noted that, as long as there is no conflict, the various embodiments and features of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0019] Although the flowchart describes the operations as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. The order of the operations can be rearranged. A process can terminate when its operation is complete, but it may also have additional steps not included in the diagram. A process can correspond to a method, function, procedure, subroutine, subroutine, etc.

[0020] Computer equipment includes user equipment and network equipment. User equipment or clients include, but are not limited to, computers, smartphones, PDAs, etc.; network equipment includes, but is not limited to, a single network server, a server group consisting of multiple network servers, or a cloud based on cloud computing consisting of a large number of computers or network servers. Computer equipment can operate independently to implement this invention, or it can connect to a network and implement this invention through interaction with other computer equipment in the network. The network in which the computer equipment is located includes, but is not limited to, the Internet, wide area network, metropolitan area network, local area network, VPN network, etc.

[0021] my country's shale gas deposits cover medium-deep shale formations and deep shale formations with a vertical depth greater than 3500m. In recent years, CNPC has conducted exploration and development in blocks such as Changning-Weiyuan and Luzhou, while Sinopec has conducted exploration and development in blocks such as Fuling, Weirong, and Yongchuan, basically achieving efficient development of medium-deep shale gas formations with a vertical depth of less than 3500m. For deep shale gas formations with a vertical depth greater than 3500m, due to the hilly and mountainous terrain of the work areas, in order to reduce surface engineering costs and improve the overall development efficiency of shale gas, platform well models are adopted, using "well factory" technology for development. Most deployed wells are not on the same straight line as the target point, and are all three-dimensional horizontal wells. Due to the characteristics of large burial depth and large lateral displacement, the wellbore trajectory design is complex, affecting geological target positioning and horizontal trajectory control during drilling.

[0022] Currently, extensive research has been conducted both domestically and internationally on trajectory profiles and design methods in 3D horizontal well trajectory design. Single optimization points have been proposed, such as reducing drilling difficulty, minimizing total trajectory length, and reducing drilling and completion costs. However, these are all limited to geometric trajectory optimization under single-well construction mode. For deep shale gas, due to the adoption of platform well mode, with 6-12 wells deployed on a single platform, the trajectory design methods based on the above optimization points cannot achieve optimal wellbore trajectory design for the entire platform. There are problems such as high collision probability and high total drilling scale, which cannot fully benefit the drilling speed of the entire shale gas platform and the reservoir drilling rate requirements in the horizontal section.

[0023] To overcome the shortcomings of the above design schemes, this invention proposes a shale gas platform well trajectory design method. This method can achieve a relatively optimal overall platform trajectory design, which helps to speed up platform drilling and ensure the drilling rate of reservoirs in the horizontal section.

[0024] The overall concept of this invention is as follows: 1. The multi-factor correlation analysis method was used to optimize the track profile type, the location of the build-up point, the relationship between the build-up rate and the azimuth section, and to determine the key elements of single-well track optimization design.

[0025] 2. Based on the angle relationship between the line connecting the wellheads on the same side of the platform and the azimuth line of the horizontal section, analyze the collision risk and total drilling footage of the entire platform under different angle relationships, and optimize the platform wellhead number corresponding to the underground target point.

[0026] 3. Based on the optimized platform wellhead layout and key elements of single-well track design, complete the track design under the shale gas platform mode.

[0027] The following describes the detailed flow of the method according to an embodiment of the present invention with reference to the accompanying drawings, the steps of which can be executed in a computer system containing, for example, a set of computer-executable instructions. Although the logical order of the steps is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0028] Example 1 Figure 1 This diagram illustrates a flow chart of the shale gas platform well trajectory design method provided in Embodiment 1 of the present invention. (Refer to...) Figure 1 As can be seen, the method includes the following steps.

[0029] Step S110: Determine the design elements, obtain geological and stratigraphic data, target depth data and directional tool capability information of each platform well in the shale gas development area, and formulate the key elements of the single-well trajectory design of the platform according to the initial wellhead number set and the requirements of three-dimensional horizontal well trajectory design technology and drilling speed-up technology. Step S120 of the wellhead layout optimization: Calculate the data of the connection line between wellheads on the same side of the platform, and formulate a matching optimization strategy based on the angle between the connection line and the horizontal azimuth line to adjust the wellhead layout. Platform track design step S130: Based on the adjusted wellhead layout, implement multi-well track design of the platform mode simultaneously according to the key elements of single-well track design.

[0030] Furthermore, in one embodiment, in the design element determination step S110, the key elements of the platform single-well track design include the track profile type; Based on the obtained target parameters and the wellhead coordinates of the platform's single well, a three-dimensional horizontal well trajectory design is carried out to select the trajectory profile type suitable for the current platform's single well.

[0031] In practical applications, taking shale platform wells with a vertical depth exceeding 3500m concentrated in the southern Sichuan work area of ​​the Sichuan Basin as an example, the terrain is mainly hilly, and a platform development model is adopted. One platform deploys 6-12 wells in a double-row wellhead layout. Both the wellheads and underground target points are numbered clockwise, with a wellhead spacing of 8-12m, a row spacing of 30m, a vertical target distance of 300-350m, and a horizontal section spacing of 300-400m. The azimuth is 0° or 180°, and a standard double-row well network deployment (α=90°) is used. Figure 2 As shown in Table 1, the geological and engineering data for a single well are as follows.

[0032]

[0033] Based on the wellhead coordinates and target parameters of a single well, a suitable track profile type is selected using the three-dimensional horizontal well track design method. Taking the wellhead and target data of a certain platform in the work area as an example, the three-dimensional horizontal well track design method is used to comprehensively evaluate the commonly used three-dimensional, dual two-dimensional, and "two-dimensional + small three-dimensional" track profiles. Based on factors such as the shortest single-well construction footage, the lowest construction friction torque, and the relatively safe wellbore collision risk, the "dual two-dimensional" and "two-dimensional + small three-dimensional" track profiles are selected for single wells.

[0034] Therefore, in a specific embodiment, the three-dimensional horizontal well track design technology is used to preferentially select dual two-dimensional and / or two-dimensional + small three-dimensional as the single-well track profile type of the platform.

[0035] In the selected "double two-dimensional" and "two-dimensional + small three-dimensional" track profiles, the second well section uses a two-dimensional track. The researchers considered that the location of the start-up point and the size of the well inclination angle determine the size of the bottom hole displacement. The initial single-well track is designed with the start-up point according to the size of the bottom hole displacement, so that the start-up point is located in the formation with a high drillability value (such as the Xujiahe Formation, Maokou Formation-Shiniulan Formation), which can positively affect the efficiency of directional drilling. Therefore, in one embodiment, in the design element determination step S110, based on the acquired geological stratification data and combined with drilling speed-up technology profile technology, the correlation between the trajectory design start point and rock drillability is analyzed, and the available start point locations are proposed.

[0036] Furthermore, in one embodiment, the analysis of the correlation between the designed descent point and rock drillability includes: The location of the build-up point is designed by combining the well inclination angle and the bottom hole displacement, so that the vertical well section or the stable inclination well section mode can penetrate the formation with a high drillability value.

[0037] Based on the geological stratification, rock drillability rating, and number of drilling runs characteristics of the second well section in Table 1, and following the principle of accelerating drilling in formations with high drillability ratings using composite drilling, i.e., using vertical or stable deviated well sections to traverse formations with high drillability ratings, is more conducive to improving the construction efficiency of the deviated well section and leveraging the advantage of accelerating drilling in a single run compared to optimizing the well depth at the start-up point location in formations with relatively low drillability ratings (Shaximiao Formation, Leikoupo-Changxing Formation).

[0038] The reservoir in the work area is deeply buried, the geological conditions are complex, the lateral displacement of the platform well is large, the accuracy of seismic profile prediction is not high, and there may be situations where the vertical depth of the strata is shallowed or deepened. In the field construction, there are problems such as insufficient build-up rate in the next step, well filling and sidetracking, or increasing drilling footage, which affect the geological target and horizontal section trajectory control.

[0039] Therefore, in order to ensure that the designed trajectory build-up rate can promote the effective operation of well-filling sidetracking and reliably increase drilling footage, in one embodiment, in the design element determination step S110 of this application, using the acquired target point vertical depth data, according to the geological steering process and trajectory adjustment requirements, and based on the correlation between the underground target point vertical depth prediction accuracy and the build-up rate, the build-up rate corresponding to the target point vertical depth prediction accuracy is proposed as the available single-well trajectory design build-up rate; based on the correlation between the steering tool capability and the azimuth section parameters, the matching azimuth section corresponding to the available steering tool capability is proposed as the available azimuth section of the current platform well.

[0040] Specifically, in practical applications, during the design element determination step, considering the characteristic that the greater the well inclination, the weaker the azimuth adjustment capability of the steering tool, and according to the trajectory adjustment requirements that increasing the build-up rate and shortening the target distance when the vertical depth is shallower, and increasing the target distance when the vertical depth is deeper, the build-up rate is optimized, and a high-low mode is adopted; if the well inclination is greater than 60°, the azimuth adjustment of the corresponding well section is set to the upper limit value of the azimuth adjustment.

[0041] For example, based on the characteristics of rotary steering construction in the three-section landing well section in Table 1, after drilling to the marker layer in the landing section to preliminarily determine the vertical depth relationship of the target point, according to the trajectory control principles of "shrinking the vertical depth to increase the build-up rate and shorten the distance to the target" and "deepening the vertical depth to stabilize the inclination and increase the distance to the target", and considering the insufficient azimuth-shifting capability of large well steerable tools, the build-up rate is optimized to an upper-large and lower-small mode (upper part 20-22° / 100m, lower part 16-18° / 100m), and large-scale azimuth shifts are avoided in well sections with an inclination of more than 60° (distance from the target azimuth ≤ 20°). This can effectively avoid landing trajectory design and trajectory control problems caused by the reliability of geological prediction.

[0042] The optimized design parameters for the platform well track are shown in Table 2 below:

[0043] By adopting the scheme in the above embodiments, the drilling speed-up technology profile and geological steering technology are introduced into the single-well trajectory design. This leverages the advantages of one-trip drilling and precise geological steering technology, which can effectively solve the problems of low efficiency in directional drilling in relatively difficult formations and large well azimuth twisting construction. It can also effectively avoid trajectory control problems caused by the reliability of geological prediction.

[0044] Considering that the work area is mainly hilly, with many houses, people and farmland around the well site, some platforms may have non-standard double-row wellhead layouts (α≠90°) due to site selection limitations. Using clockwise numbering for both wellheads and underground target points in single-well track design will result in the entire platform not achieving overall optimization.

[0045] according to Figure 3The angle between the wellhead azimuth line and the horizontal azimuth line shown in the figure is used to optimize the wellhead numbering of double-row wellhead layouts with angles of 0-45° or 135-180°, based on the principle of reducing the overall platform collision risk and reducing the total drilling footage by utilizing wellhead spacing and row spacing. Figure 4 Wellhead numbering with an included angle of 45-135° is not optimized.

[0046] In a specific embodiment, in the wellhead layout optimization step S120, platform wells with an angle of 0-45° or 135-180° between the wellhead azimuth line and the horizontal segment azimuth line are selected. Based on the goal of minimizing the probability of collision of the entire platform track and minimizing the total drilling footage, the optimized wellhead number of the corresponding platform well is calculated and selected to replace the initial wellhead number.

[0047] In platform trajectory design step S130, based on the adjusted wellhead layout, multi-well trajectory design is implemented simultaneously according to the key elements of platform well trajectory design. Specifically, based on the optimized wellhead numbering, a single-well trajectory optimization design method is adopted, introducing the platform design mode to design the trajectory for the entire platform. This achieves optimal trajectory design for the entire platform, reduces the risk of wellbore collisions and total drilling footage during platform construction, improves drilling efficiency, and saves drilling time and well construction costs.

[0048] For the foregoing method embodiments, in order to simplify the description, they are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, because according to the present invention, some steps can be performed in other orders or simultaneously. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0049] It should be noted that, in other embodiments of the present invention, the method can also combine one or more of the above embodiments to obtain a new shale gas platform well trajectory design method, so as to achieve efficient and reliable trajectory design for ultra-deep shale gas wells or wells with complex structures.

[0050] It should be noted that, based on the methods in any one or more embodiments of the present invention described above, the present invention also provides a storage medium storing program code that can implement the methods described in any one or more embodiments, and when the code is executed by the operating system, it can implement the shale gas platform well trajectory design method as described above.

[0051] Example 2 The methods described in detail in the above-disclosed embodiments of the present invention can be implemented using various forms of devices or systems. Therefore, based on other aspects of the methods described in any one or more of the above embodiments, the present invention also provides a shale gas platform well trajectory design system, which is used to execute the shale gas platform well trajectory design method described in any one or more of the above embodiments. Specific embodiments are given below for detailed description.

[0052] Specifically, Figure 5 The diagram shows a structural schematic of the shale gas platform well trajectory design system provided in an embodiment of the present invention, as shown below. Figure 5 As shown, the system includes: The design element determination module is configured to acquire geological and stratigraphic data, target depth data, and steering tool capability information for each platform well in the shale gas development area, and formulate key elements for the single-well trajectory design of the platform according to the initial wellhead number set and the requirements of three-dimensional horizontal well trajectory design technology and drilling speed-up technology. The wellhead layout optimization module is configured to collect data on the connection lines of wellheads on the same side of the platform, and formulate matching optimization strategies based on the angle between the connection lines and the horizontal azimuth line to adjust the wellhead layout. The platform track design module is configured to simultaneously implement multi-well track design in the platform mode based on the adjusted wellhead layout and the key elements of single-well track design.

[0053] In one embodiment, key elements of the platform well track design include the track profile type; Based on the obtained target parameters and the wellhead coordinates of the platform's single well, a three-dimensional horizontal well trajectory design is carried out to select the trajectory profile type suitable for the current platform's single well.

[0054] Furthermore, in one embodiment, the design element determination module includes a track profile analysis unit, which is configured to use three-dimensional horizontal well track design technology to select dual two-dimensional and / or two-dimensional + small three-dimensional as the single-well track profile type of the platform.

[0055] In a preferred embodiment, the design element determination module includes a directional drilling point determination unit, which analyzes the correlation between the directional drilling point and rock drillability based on the acquired geological stratification data and drilling speed-up technology profile technology, and proposes the location of the available directional drilling point.

[0056] Specifically, in one embodiment, the design element determination module includes a build-up rate and azimuth decision unit, which is configured as follows: using the acquired target vertical depth data, according to the geological steering technology and trajectory adjustment requirements, and based on the correlation between the underground target vertical depth prediction accuracy and the build-up rate, the module proposes the build-up rate corresponding to the target vertical depth prediction accuracy as the available single-well trajectory design build-up rate; and based on the correlation between the steering tool capability and the azimuth well section parameters, the module proposes the matching azimuth well section corresponding to the available steering tool capability as the available azimuth well section of the current platform well.

[0057] Specifically, in one embodiment, the wellhead layout optimization module is configured to: select platform wells with an angle of 0-45° or 135-180° between the wellhead azimuth line and the horizontal segment azimuth line, and calculate and select the optimized wellhead number of the corresponding platform well to replace the initial wellhead number, based on the goal of minimizing the probability of collision of the entire platform track and minimizing the total drilling footage.

[0058] In practical applications, for specific embodiments, the design element determination module can analyze the correlation between the track design deflection point and rock drillability through the following operations: The location of the build-up point is designed by combining the well inclination angle and the bottom hole displacement, so that the vertical well section or the stable inclination section mode can penetrate the formation with a high drillability value.

[0059] The following operations are used to optimize the build-up rate and azimuth parameters: taking into account the characteristic that the greater the well inclination, the weaker the azimuth capability of the steering tool, and according to the trajectory adjustment requirements that increasing the build-up rate and shortening the target distance when the vertical depth is shallower and increasing the target distance when the vertical depth is deeper, the build-up rate is optimized by adopting the upper-large and lower-small mode. If the well inclination is greater than 60°, the azimuth of the corresponding well section is set to the upper limit of the set azimuth.

[0060] In the shale gas platform well trajectory design system provided in this embodiment of the invention, each module or unit structure can operate independently or in combination according to actual design and optimization requirements to achieve the corresponding technical effects.

[0061] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0062] The phrase "an embodiment" in the specification means that a specific feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0063] While the embodiments disclosed in this invention are as described above, the content is merely for the purpose of facilitating understanding of the invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in form and detail of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A method for designing the trajectory of a shale gas platform well, characterized in that, The method includes: The steps for determining design elements include: obtaining geological and stratigraphic data, target depth data, and directional tool capability information for each platform well in the shale gas development area; and formulating key elements for the single-well trajectory design of the platform according to the initial wellhead number and the requirements of three-dimensional horizontal well trajectory design technology and drilling speed-up technology. The wellhead layout optimization steps include: collecting data on the connection lines of wellheads on the same side of the platform; and formulating matching optimization strategies based on the angle between the connection lines and the horizontal azimuth line to adjust the wellhead layout. The platform track design steps, based on the adjusted wellhead layout, involve simultaneously implementing the multi-well track design of the platform mode according to the key elements of the single-well track design of the platform. In the design element determination step, based on the acquired geological stratification data and combined with drilling speed-up technology profile technology, the correlation between the designed directional drilling point and rock drillability is analyzed, and the available directional drilling point locations are proposed. During the analysis of the correlation between the designed directional drilling point and rock drillability, the directional drilling point locations are designed in combination with the well inclination angle and the bottom hole completion displacement, so that the vertical well section or stable inclination well section mode can penetrate the formation with high drillability value. In the design element determination step, using the acquired target vertical depth data, and based on the geological steering process and trajectory adjustment requirements, and according to the correlation between the accuracy of the underground target vertical depth prediction and the build-up rate, the build-up rate corresponding to the accuracy of the target vertical depth prediction is proposed as the usable single-well trajectory design build-up rate; based on the correlation between the steering tool capability and the azimuth section parameters, the matching azimuth section corresponding to the steering tool capability is proposed as the usable azimuth section of the current platform well. In particular, considering the characteristic that the greater the well inclination, the weaker the steering tool's azimuth capability, and according to the trajectory adjustment requirements that shallowing the vertical depth increases the build-up rate and shortens the target distance, and deepening the vertical depth increases the target distance during stable drilling, the build-up rate is optimized, adopting an upper-large and lower-small mode. If the well inclination is greater than the set value, the azimuth of the corresponding well section is set to the set upper limit value of the azimuth. In the wellhead layout optimization step, platform wells with an angle of 0-45° or 135-180° between the wellhead azimuth line and the horizontal segment azimuth line are selected. Based on the goal of minimizing the probability of collision of the entire platform track and minimizing the total drilling footage, the optimized wellhead number of the corresponding platform well is calculated and selected to replace the initial wellhead number.

2. The method as described in claim 1, characterized in that, In the design element determination step, the key elements of the platform single-well track design include the track profile type; Based on the obtained target parameters and the wellhead coordinates of the platform's single well, a three-dimensional horizontal well trajectory design is carried out to select the trajectory profile type suitable for the current platform's single well.

3. The method as described in claim 2, characterized in that, The three-dimensional horizontal well track design technology is used to select dual two-dimensional and / or two-dimensional + small three-dimensional as the single well track profile type of the platform.

4. A storage medium, characterized in that, The storage medium stores program code that can implement the method as described in any one of claims 1 to 3.

5. A shale gas platform well trajectory design system, characterized in that, The system performs the method as described in any one of claims 1 to 3.

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