A method, system and electronic device for determining the wellbore trajectory of multi-target drilling

Abstract

The present invention relates to the technical field of oil and gas drilling, and in particular to a method, system and electronic device for determining the wellbore trajectory of multi-target drilling. The method includes: determining the positions of at least one main target and at least one alternative target according to the main oil and gas area and the remaining oil and gas area in the oil and gas area to be exploited, calculating multiple trajectories of the main wellbore, and the trajectories of the sidetracked wellbores corresponding to each sidetracking point; selecting the trajectory of the main wellbore with the wellhead position within the target wellhead range as the first target trajectory, and selecting the trajectory of the sidetracked wellbore with the wellhead position within the target wellhead range as the second target trajectory; determining the final trajectory of the main wellbore from all reasonable first target trajectories, and determining the final trajectory of each sidetracked wellbore from all the second target trajectories corresponding to each sidetracked wellbore. Considering various factors comprehensively is beneficial to improving the scientificity of deploying the wellbore and the final trajectory of each wellbore, and improving the development efficiency of the oil and gas area.

Description

Background Art

[0002] At present, most oilfields are facing a dual dilemma: on the one hand, the number of effective new wells that can continuously collect oil and gas is decreasing, and it is becoming increasingly difficult to significantly increase production; on the other hand, a large number of low-production old wells are continuously emerging, and the efficiency of old wells is getting lower and lower. Moreover, due to the characteristics of carbonate reservoirs with many fracture-cavity bodies, discontinuous fracture-cavity bodies or inconsistent orientations, it is impossible to achieve multiple geological targets through a single wellbore at the same time. In the later stage of reservoir development, it is necessary to sidetrack old wellbores to develop the remaining oil. How to effectively deploy the wellbores in the oil and gas area to be exploited is a technical problem that urgently needs to be solved. Among them, wellbore trajectory design is the most critical link, which is of great significance for improving the scientificity and efficiency of drilling operations.

[0003] The potential tapping and production increase of old oil and gas areas are very crucial. Sun Ning, an expert from the Consulting Center of China National Petroleum Corporation, pointed out in the literature "Sidetracked horizontal wells should become an important technical policy for improving the production of low-production wells in old oil and gas areas": Sidetracked horizontal wells in old wells have technical advantages such as lower cost per ton of oil and greater increase in single-well production, and should become an important technical measure for improving the production of low-production wells in old areas.

[0004] In addition, due to the characteristics of carbonate reservoirs with many fracture-cavity bodies, discontinuous fracture-cavity bodies or inconsistent orientations, it is impossible to achieve multiple geological targets through a single wellbore at the same time. In the later stage of reservoir development, it is necessary to sidetrack old wellbores to develop the remaining oil. At present, with the progress of reservoir fine description technology, geological experts have a clearer understanding of the reservoir area, which also provides a good technical foundation for the early deployment of sidetracked wells.

[0005] For the above reasons, considering the difficulty of later sidetracking and the comprehensive drilling cost, it is necessary to conduct early deployment and feasibility demonstration of these wells for sidetracking, so as to significantly reduce the difficulty of later sidetracking and the drilling cost per well. And wellbore trajectory design is the most critical link among them. Therefore, it is urgent to develop a multi-target trajectory optimization design method and system considering the later sidetracking requirements, which is of great significance and promotion value for improving the scientificity and efficiency of drilling operations. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a method, system and electronic device for determining the wellbore trajectory of multi-target drilling in view of the deficiencies of the prior art.

[0007] The technical solution of a method for determining the wellbore trajectory of multi-target drilling according to the present invention is as follows:

[0008] Obtain the distribution map of the oil and gas reservoir in the oil and gas area to be exploited, and determine the main controlled oil and gas area and the remaining oil and gas area in the oil and gas area to be exploited according to the distribution map;

[0009] Determine the positions of at least one main target according to the main controlled oil and gas area, and determine the positions of at least one alternative target according to the remaining oil and gas area;

[0010] According to the position of any main target and the preset drilling engineering parameters for the main wellbore, and using a two-dimensional trajectory calculation model to perform trajectory calculation, obtain the trajectory of the main wellbore corresponding to this main target until the trajectories of multiple main wellbores are obtained;

[0011] According to the wellbore structure data of the main wellbore and the position of any alternative target, obtain multiple undetermined feasible positions of the sidetracking point corresponding to this alternative target until all undetermined feasible positions of the sidetracking point corresponding to each alternative target are obtained;

[0012] Design the trajectories of the sidetrack wellbores corresponding to each sidetracking point respectively according to the undetermined feasible positions of each sidetracking point;

[0013] Determine the target wellhead range according to all the trajectories of the main wellbore, all the trajectories of each sidetrack wellbore, and the environmental assessment chart of the oil and gas area to be exploited;

[0014] Select the trajectory of the main wellbore with the wellhead position within the target wellhead range as the first target trajectory, and select the trajectory of the sidetrack wellbore with the wellhead position within the target wellhead range as the second target trajectory;

[0015] Judge whether the drilling process data of each first target trajectory is reasonable respectively, and judge whether the drilling process data of each second target trajectory is reasonable respectively;

[0016] Determine the final trajectory of the main wellbore from all the reasonable first target trajectories, and determine the final trajectory of each sidetrack wellbore from all the second target trajectories corresponding to each sidetrack wellbore.

[0017] The beneficial effects of a method for determining the wellbore trajectory of multi-target drilling according to the present invention are as follows:

[0018] Comprehensively consider factors such as the selection of the wellhead position, the drilling process, and the environmental assessment chart of the oil and gas area to be exploited, determine the final trajectory of the main wellbore and the final trajectory of each sidetrack wellbore, which is beneficial to improving the scientificity of deploying the wellbore and the final trajectory of each wellbore, and can also provide more convenient conditions for the long-term high-yield and stable production of old oilfields, so as to improve the development efficiency of the oil and gas area.

[0019] The technical solution of a system for determining the wellbore trajectory of multi-target drilling according to the present invention is as follows:

[0020] It includes an acquisition and determination module, a target determination module, a trajectory determination module, a wellhead range determination module, a selection module, a judgment module, and a final trajectory determination module;

[0021] The determination module is configured to: obtain a distribution map of the oil and gas reservoir in the oil and gas area to be exploited, and determine the main oil and gas area and the remaining oil and gas area in the oil and gas area to be exploited according to the distribution map;

[0022] The target determination module is configured to: determine the positions of at least one main target according to the main oil and gas area, and determine the positions of at least one standby target according to the remaining oil and gas area;

[0023] The trajectory determination module is configured to:

[0024] According to the position of any main target and the preset drilling engineering parameters for the main wellbore, and using a two-dimensional trajectory calculation model to perform trajectory calculation, obtain the trajectory of the main wellbore corresponding to the main target until multiple trajectories of the main wellbore are obtained;

[0025] According to the wellbore structure data of the main wellbore and the position of any standby target, obtain multiple undetermined feasible positions of the sidetracking point corresponding to the standby target until all undetermined feasible positions of the sidetracking point corresponding to each standby target are obtained;

[0026] According to the undetermined feasible positions of each sidetracking point, design the trajectories of the sidetracks corresponding to each sidetracking point respectively;

[0027] The wellhead range determination module is configured to: determine the target wellhead range according to all the trajectories of the main wellbore, all the trajectories of each sidetrack, and the environmental assessment map of the oil and gas area to be exploited;

[0028] The selection module is configured to: select the trajectory of the main wellbore with the wellhead position within the target wellhead range as the first target trajectory, and select the trajectory of the sidetrack with the wellhead position within the target wellhead range as the second target trajectory;

[0029] The judgment module is configured to: respectively judge whether the drilling process data of each first target trajectory is reasonable, and respectively judge whether the drilling process data of each second target trajectory is reasonable;

[0030] The final trajectory determination module is configured to: determine the final trajectory of the main wellbore from all the reasonable first target trajectories, and determine the final trajectory of each sidetrack from all the second target trajectories corresponding to each sidetrack.

[0031] The beneficial effects of a multi-target drilling wellbore trajectory determination system of the present invention are as follows:

[0032] Taking into comprehensive consideration factors such as the selection of the wellhead position, the drilling process, and the environmental assessment chart of the oil and gas area to be exploited, determining the final trajectory of the main wellbore and the final trajectory of each sidetrack wellbore is conducive to improving the scientific nature of the deployed wellbores and the final trajectory of each wellbore, and can also provide more convenient conditions for the long-term high and stable production of old oilfields, so as to improve the development efficiency of the oil and gas area.

[0033] A storage medium of the present invention, wherein instructions are stored in the storage medium, and when a computer reads the instructions, the computer is caused to execute a method for determining a multi-target drilling wellbore trajectory as described in any one of the above.

[0034] An electronic device of the present invention includes a processor and the above storage medium, and the processor executes the instructions in the storage medium. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic flow chart of a method for determining a multi-target drilling wellbore trajectory according to an embodiment of the present invention;

[0036] Figure 2 It is a distribution map of oil and gas reservoirs in the oil and gas area to be exploited;

[0037] Figure 3 It is a schematic diagram for calculating costs;

[0038] Figure 4 It is a schematic diagram of target points and wellhead positions;

[0039] Figure 5 It is one of the schematic structural diagrams of a multi-target drilling wellbore trajectory determination system according to an embodiment of the present invention;

[0040] Figure 6 It is the second schematic structural diagram of a multi-target drilling wellbore trajectory determination system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] As Figure 1 shown, a method for determining a multi-target drilling wellbore trajectory according to an embodiment of the present invention includes the following steps:

[0042] S1. Obtain a distribution map of oil and gas reservoirs in the oil and gas area to be exploited, and determine the main controlled oil and gas area and the remaining oil and gas area of the oil and gas area to be exploited according to the distribution map;

[0043] Among them, the main controlled oil and gas area refers to: the oil and gas area mainly exploited by this well determined by reservoir geologists according to the results of fine reservoir description;

[0044] Among them, the remaining oil and gas area refers to: the area for later development determined by reservoir geologists according to the results of fine reservoir description;

[0045] Among them, the process of determining the main oil and gas area and the remaining oil and gas area of the oil and gas area to be exploited according to the distribution map is as follows:

[0046] Oilfield reservoir geologists use various means such as geological methods, reservoir engineering, well testing and numerical simulation methods, and laboratory experiment techniques, and utilize various technologies such as the technology for identifying buried hill complex lithology by making full use of reservoir properties, the fine description of complex structures based on development seismic technology, the fine prediction technology of reservoirs by combining well and seismic data, the technology for characterizing fractures in extra-low permeability reservoirs, the technology for classifying the microscopic pore structures of conglomerate reservoirs, the technology for depicting interbeds based on dense well pattern data, the technology for interpreting watered-out layers in conglomerate reservoirs, the technology for characterizing reservoir changes during the oilfield development process, the technology for identifying the dominant flow channels in conglomerate reservoirs, the technology for quantitatively classifying and evaluating low permeability reservoirs, the technology for constructing block reservoir configurations, and the technology for comprehensively characterizing remaining oil in multiple disciplines to determine the main oil and gas area and the remaining oil and gas area to be exploited in this wellbore.

[0047] S2. Determine the positions of at least one main target according to the main oil and gas area, and determine the positions of at least one alternative target according to the remaining oil and gas area;

[0048] Among them, the main target refers to the target in the oil and gas area mainly exploited in the early stage of this well determined by reservoir geological designers according to factors such as the structural change trend in the fault block area, the dip and strike of faults, the shape and scope of oil and gas enrichment distribution, the thickness of oil layers, the degree of heterogeneity of the target layer, physical properties, sedimentary characteristics, and the coning of edge and bottom water.

[0049] Among them, the alternative target refers to the target in the area for later development determined by reservoir geologists according to the results of fine reservoir description.

[0050] Among them, the process of determining the positions of at least one main target according to the main oil and gas area is as follows:

[0051] The target in the oil and gas area mainly exploited in the early stage of this well determined by reservoir geological designers according to factors such as the structural change trend in the fault block area, the dip and strike of faults, the shape and scope of oil and gas enrichment distribution, the thickness of oil layers, the degree of heterogeneity of the target layer, physical properties, sedimentary characteristics, and the coning of edge and bottom water in the main oil and gas area is used as the main target. Among them, the process of determining the positions of at least one alternative target according to the remaining oil and gas area is as follows:

[0052] The target in the area for later development determined by reservoir geologists according to the results of fine reservoir description of the remaining oil and gas area is used as the alternative target.

[0053] Such as Figure 2As shown, a primary target, namely primary target A, is determined, and two alternative targets, namely alternative target A and alternative target B, are determined. S3. Based on the position of any primary target and the drilling engineering parameters preset for the main wellbore, and using a two-dimensional trajectory calculation model to perform trajectory calculation, the trajectory of the main wellbore corresponding to the primary target is obtained until multiple trajectories of the main wellbore are obtained;

[0054] Among them, the drilling engineering parameters include: wellbore structure data, casing string structure data, position data of the sidetracking point, casing running capacity analysis data, drilling hydraulic parameters, drilling mechanical parameters, etc.

[0055] Among them, specifically, a two-dimensional trajectory calculation model with a conventional curvature radius can be used for trajectory calculation, as follows:

[0056] Use professional wellbore trajectory design software such as COMPASS for design to issue wellbore orbit profile data;

[0057] The on-site directional well engineer reviews and proofreads the profile data in combination with the directional ability of the on-site actual directional tools. The profile data that needs to be checked includes but is not limited to the maximum build rate, target data, well inclination change rate, and azimuth change rate.

[0058] S4. Based on the wellbore structure data of the main wellbore and the position of any alternative target, multiple undetermined feasible positions of the sidetracking point corresponding to the alternative target are obtained until all undetermined feasible positions of the sidetracking point corresponding to each alternative target are obtained. The specific process is as follows:

[0059] According to the geological stratification situation, the depth range [D1, D2] where the formation with good stability is located is preferably selected;

[0060] In the range [D1, D2], the position range [D1’, D2’] where a single layer of casing is located is preferably selected;

[0061] In the range [D1’, D2’], the position range [D1″, D2″] where the hole diameter enlargement rate of the adjacent well is less than 10% is preferably selected;

[0062] In the range [D1″, D2″], the position range of non-casing collars is preferably selected to determine multiple undetermined feasible positions of the sidetracking point.

[0063] S5. According to the undetermined feasible positions of each sidetracking point, the trajectories of the sidetracks corresponding to each sidetracking point are designed respectively. The specific process is as follows:

[0064] Use professional wellbore trajectory design software such as COMPASS for design to issue wellbore orbit profile data;

[0065] The on-site directional well engineer reviews and proofreads the profile data in combination with the directional capabilities of the on-site actual directional tools. The profile data to be checked includes, but is not limited to, the maximum build rate, target point data, hole angle change rate, and azimuth change rate.

[0066] S6. Determine the target wellhead range based on all the trajectories of the main wellbore, all the trajectories of each sidetrack wellbore, and the environmental assessment map of the oil and gas area to be exploited. The specific process is as follows:

[0067] The environmental assessment map specifically refers to the environmental assessment and protection map delimited by the national environmental protection department. When selecting the wellhead location, it is necessary to strictly follow the requirements of the environmental assessment map and select within the permitted area.

[0068] S7. Select the trajectory of the main wellbore with the wellhead location within the target wellhead range as the first target trajectory, and select the trajectory of the sidetrack wellbore with the wellhead location within the target wellhead range as the second target trajectory.

[0069] S8. Determine whether the drilling process data of each first target trajectory is reasonable respectively, and determine whether the drilling process data of each second target trajectory is reasonable respectively.

[0070] Among them, the drilling process data includes: casing running capacity data, drilling hydraulics data, and wellbore stability data. The judgment criteria for reasonableness are as follows:

[0071] Casing running capacity data: Conduct finite element analysis to carry out the analysis of the ultimate wellbore curvature for casing running and the safety evaluation of the casing. The analysis result of the casing running capacity shows that no buckling deformation occurs during the running process.

[0072] Drilling hydraulics data: Whether the displacement and pump pressure of the hydraulics parameters required for drilling the subsequent wellbore can meet the engineering practice.

[0073] Wellbore stability data: The oil and gas reservoir is in an environment of high pressure, high temperature, and high in-situ stress. During the drilling process, overflow, collapse, and loss accidents occur frequently. At the same time, the development of fractures and the concentration of in-situ stress jointly lead to extremely strong formation anisotropy, and the drilling risks on different azimuth wellbore trajectories are different. The designed wellbore trajectory should meet the requirements of wellbore stability, and the wellbore trajectory azimuth should be designed along the direction with good wellbore stability. If the casing running capacity data, drilling hydraulics data, and wellbore stability data of the first target trajectory all meet the engineering practice, then it is determined that the drilling process data of this first target trajectory is reasonable; otherwise, it is determined that the drilling process data of this first target trajectory is unreasonable, and all reasonable first target trajectories are thus determined.

[0074] S9. Determine the final trajectory of the main wellbore from all the reasonable first target trajectories, and determine the final trajectory of each sidetrack wellbore from all the second target trajectories corresponding to each sidetrack wellbore.

[0075] The present invention comprehensively considers factors such as the selection of the wellhead position, the drilling process, and the environmental assessment map of the oil and gas area to be exploited, determines the final trajectory of the main wellbore and the final trajectory of each sidetrack wellbore, which is conducive to improving the scientificity of deploying the wellbore and the final trajectory of each wellbore, and can also provide more convenient conditions for the long-term high-yield and stable production of old oilfields, so as to improve the development efficiency of the oil and gas area.

[0076] Optionally, in the above technical solution, in S9, determining the final trajectory of the main wellbore from all reasonable first target trajectories includes:

[0077] S90. When the number of reasonable first target trajectories is 1, determining this reasonable first target trajectory as the final trajectory of the main wellbore;

[0078] S91. When the number of reasonable first target trajectories is at least 2, determining the reasonable first target trajectory with the lowest cost as the final trajectory of the main wellbore.

[0079] Optionally, in the above technical solution, in S9, the process of determining the final trajectory of any sidetrack wellbore includes:

[0080] S92. When the number of reasonable second target trajectories corresponding to any sidetrack wellbore is 1, determining this reasonable second target trajectory as the final trajectory of this sidetrack wellbore.

[0081] When the number of reasonable second target trajectories corresponding to any sidetrack wellbore is at least 2, determining the reasonable second target trajectory with the lowest cost as the final trajectory of this sidetrack wellbore.

[0082] The process of calculating the cost is as follows:

[0083] As Figure 3 shown, the linear cost and non-linear cost of the wellbore are calculated based on well depth, well type, rig cost, window cutting and sidetracking cost, material cost, new technology additional cost, and well team comprehensive cost, and the annual growth rate of the cost is predicted by combining multiple linear regression algorithm, neural network prediction algorithm, support vector machine prediction algorithm or improved particle swarm algorithm, so as to predict the cost of the newly drilled main wellbore and sidetrack wellbore.

[0084] In another embodiment, it includes:

[0085] S101. Conducting refined description of the oil and gas reservoir, and describing the main oil area and remaining oil combination;

[0086] Specifically, geological personnel use the mastered data such as seismic data and adjacent well data to conduct refined descriptions of the geological characteristics, structural characteristics, reservoir development characteristics, oil and gas physical properties data, and oil-water interface of the oil and gas reservoir, describe the main oil areas and remaining oil combinations, clarify the reserves controlled by each wellbore, and provide data support for the determination of the target point location.

[0087] S102. Optimize the design of the main target point and alternative target points, and determine the coordinates and vertical depths of the main target point and alternative target points;

[0088] S103. According to the information such as the coordinates, vertical depth, and control point data of the main target point, conduct trajectory trial calculations according to the conventional curvature radius and two-dimensional trajectory calculation model, and inversely deduce the possible wellhead positions, and initially determine a wellhead position;

[0089] Specifically, according to the information such as the coordinates, vertical depth, and control point data of the main target point, conduct trajectory trial calculations according to the conventional curvature radius and two-dimensional trajectory calculation model, and inversely deduce the possible wellhead positions, and initially determine a wellhead position, specifically as follows:

[0090] According to the following formula, inversely deduce the coordinates O(x0, y0) of the possible wellhead position,

[0091]

[0092]

[0093] In the formula: t is the distance before the target point A; the position coordinates of the target point A are (x1, y1); the position coordinates of the target point B are (x2, y2), as shown in Figure 4.

[0094] S104. According to the main wellbore wellbore structure and alternative target point information, initially select the position of the feasible sidetracking point;

[0095] Specifically, according to the main wellbore wellbore structure and alternative target point information, initially select the position of the feasible sidetracking point, specifically as follows:

[0096] According to the information such as the coordinates, vertical depth, and control point data of the alternative target point, conduct sidetracking trajectory trial calculations according to the conventional curvature radius and two-dimensional trajectory calculation model, and optimize the position of the sidetracking point according to the trial calculation results;

[0097] Conduct trajectory calculations according to the short radius or ultra-short radius trajectory calculation model;

[0098] When selecting the position of the sidetracking point, combine the geological stratification information, lithology, and rock mechanics characteristics, and select a relatively stable formation position for sidetracking;

[0099] When selecting the position of the sidetracking point, avoid the casing collar position, and optimize and adjust according to the actual cementing completion situation in the later stage.

[0100] S105. Design and optimize the trajectory of the sidetrack wellbore;

[0101] Specifically, designing and optimizing the trajectory of the sidetrack wellbore is specifically as follows:

[0102] The design of the sidetrack trajectory is usually divided into two different design ideas: conventional orbit design and short-radius or ultra-short-radius orbit design. When optimizing the trajectory, it is necessary to compare and analyze the advantages and disadvantages of the two orbit design ideas;

[0103] The process of optimizing the trajectory is to conduct a comprehensive feasibility demonstration on the trajectories of the main wellbore and the subsequent sidetrack wellbore based on the difficulty of the subsequent sidetracking and the comprehensive drilling cost.

[0104] S106. Considering the trajectory of the main wellbore, the trajectory of the sidetrack wellbore, and the environmental assessment map, determine a reasonable wellhead optimization range outside the ecological red line of the environmental assessment, and feedback the data to the geological reconnaissance personnel;

[0105] S107. Based on the geological reconnaissance data, reasonably optimize the wellhead position, and optimize and adjust the trajectories of the main wellbore and the sidetrack wellbore;

[0106] S108. According to the trajectory design data determined in step S107, conduct analyses such as casing tensile capacity analysis, rig load-bearing capacity analysis, casing running-in capacity analysis, drilling hydraulics analysis, and wellbore stability analysis to evaluate the rationality of the trajectory in advance;

[0107] S109. Feed back the trajectory data evaluated as reasonable in step S108 to the geological personnel for geological calibration to determine the final trajectory.

[0108] The purpose of the present invention is to provide a method for determining the wellbore trajectory of a multi-target drilling considering the subsequent sidetracking requirements, comprehensively considering the selection of the wellhead position, drilling engineering, directional well construction, completion engineering, and the difficulty and comprehensive operation cost of subsequent sidetracking, with the ultimate goal of reducing the drilling and completion operation cost in the entire reservoir block and improving the final development benefit of the entire reservoir. This is conducive to improving the scientific nature of the drilling and completion engineering and providing more convenient conditions for the long-term high-yield and stable production of old oilfields.

[0109] In the above embodiments, although the steps are numbered S1, S2, etc., these are only specific embodiments given in this application. Those skilled in the art can adjust the execution order of S1, S2, etc. according to the actual situation, and this is also within the protection scope of the present invention. It can be understood that in some embodiments, it may include some or all of the above embodiments.

[0110] Such as Figure 5As shown in the figure, a multi-target drilling wellbore trajectory determination system 200 according to an embodiment of the present invention includes an acquisition and determination module 210, a target determination module 220, a trajectory determination module 230, a wellhead range determination module 240, a selection module 250, a judgment module 260, and a final trajectory determination module 270;

[0111] The determination module 210 is configured to: acquire a distribution map of an oil and gas reservoir in an oil and gas area to be exploited, and determine a main oil and gas area and a remaining oil and gas area in the oil and gas area to be exploited according to the distribution map;

[0112] The target determination module 220 is configured to: determine the positions of at least one main target according to the main oil and gas area, and determine the positions of at least one standby target according to the remaining oil and gas area;

[0113] The trajectory determination module 230 is configured to:

[0114] According to the position of any main target and the preset drilling engineering parameters for the main wellbore, and using a two-dimensional trajectory calculation model to perform trajectory calculation, obtain the trajectory of the main wellbore corresponding to this main target until multiple trajectories of the main wellbore are obtained;

[0115] According to the wellbore structure data of the main wellbore and the position of any standby target, obtain multiple undetermined feasible positions of the sidetracking points corresponding to this standby target until all undetermined feasible positions of the sidetracking points corresponding to each standby target are obtained;

[0116] According to the undetermined feasible positions of each sidetracking point, respectively design the trajectories of the sidetrack wellbores corresponding to each sidetracking point;

[0117] The wellhead range determination module 240 is configured to: determine a target wellhead range according to all the trajectories of the main wellbore, all the trajectories of each sidetrack wellbore, and the environmental assessment map of the oil and gas area to be exploited;

[0118] The selection module 250 is configured to: select the trajectory of the main wellbore with the wellhead position within the target wellhead range as the first target trajectory, and select the trajectory of the sidetrack wellbore with the wellhead position within the target wellhead range as the second target trajectory;

[0119] The judgment module 260 is configured to: respectively judge whether the drilling process data of each first target trajectory is reasonable, and respectively judge whether the drilling process data of each second target trajectory is reasonable;

[0120] The final trajectory determination module 270 is configured to: determine the final trajectory of the main wellbore from all the reasonable first target trajectories, and determine the final trajectory of each sidetrack wellbore from all the second target trajectories corresponding to each sidetrack wellbore.

[0121] The present invention comprehensively considers factors such as the selection of the wellhead position, the drilling process, and the environmental assessment chart of the oil and gas area to be exploited, determines the final trajectory of the main wellbore and the final trajectory of each sidetrack wellbore, which is beneficial to improving the scientific nature of the deployment of the wellbore and the final trajectory of each wellbore, and can also provide more convenient conditions for the long-term high-yield and stable production of old oilfields, so as to improve the development efficiency of the oil and gas area.

[0122] Optionally, in the above technical solution, the process by which the final trajectory determination module 270 determines the final trajectory of the main wellbore from all reasonable first target trajectories includes:

[0123] When the number of reasonable first target trajectories is 1, determine this reasonable first target trajectory as the final trajectory of the main wellbore;

[0124] When the number of reasonable first target trajectories is at least 2, determine the reasonable first target trajectory with the lowest cost as the final trajectory of the main wellbore.

[0125] Optionally, in the above technical solution, the process by which the final trajectory determination module 270 determines the final trajectory of any sidetrack wellbore includes:

[0126] When the number of reasonable second target trajectories corresponding to any sidetrack wellbore is 1, determine this reasonable second target trajectory as the final trajectory of this sidetrack wellbore;

[0127] When the number of reasonable first target trajectories is at least 2, determine the reasonable first target trajectory with the lowest cost as the final trajectory of the main wellbore.

[0128] Optionally, in the above technical solution, the drilling process data includes: casing running ability data, drilling hydraulics data, and wellbore stability data.

[0129] In another embodiment, as Figure 6 shown, the system adopts an architecture design with separation of the client and the server, which not only ensures the stability of the system and prevents database packet loss, but also can improve the computing speed of the client. The client includes: a user interface, an analysis and decision-making module, a calculation module, and data display. The server includes: a database, a calculation model, data processing, new model creation, and model optimization.

[0130] The system includes: a target position optimization module, a sidetrack point feasibility demonstration module, a wellbore trajectory optimization design module, a drilling and completion engineering economic evaluation module, and a wellbore trajectory advance evaluation module;

[0131] The target position optimization module is used for geological designers to optimize the position of the target;

[0132] Specifically, geological personnel calibrate the positions of the target points and control points based on information such as refined reservoir description, and give the specific position coordinates and elevations of the target points and control points.

[0133] The sidetracking point feasibility demonstration module is used to optimize the position of the sidetracking point before the design of the sidetrack wellbore trajectory.

[0134] Specifically, the basic information required to be input into this module includes: geological stratification information, lithology and rock mechanical properties, formation stability degree, casing coupling position, wellbore structure of the main wellbore, and trajectory data of the main wellbore.

[0135] The wellbore trajectory optimization design module is used for the design and optimization of the wellbore trajectories of the main wellbore and the sidetrack wellbore.

[0136] Specifically, when designing the sidetrack wellbore trajectory, it is usually divided into two different design ideas: conventional orbit design and short-radius or ultra-short-radius orbit design. When optimizing the trajectory, it is necessary to compare and analyze the advantages and disadvantages of the two orbit design ideas.

[0137] Furthermore, the key parameters of the orbit that need to be compared and analyzed when optimizing the trajectory include: dogleg severity, target approach distance, length of the build section, length of the holding section, length of the horizontal section, and azimuth change.

[0138] The drilling and completion engineering economic evaluation module comprehensively demonstrates the feasibility of the trajectories of the main wellbore and the later sidetrack wellbore based on the difficulty of later sidetracking and the comprehensive drilling cost.

[0139] Specifically, the drilling and completion engineering economic evaluation module includes an oilfield standard well engineering pricing quota database and a wellbore trajectory evaluation calculation model; this module includes a module for analyzing the influencing factors of drilling and completion costs and a module for calculating the comprehensive drilling and completion costs. The module for calculating the comprehensive drilling and completion costs includes multiple linear regression algorithms, neural network prediction algorithms, support vector machine prediction algorithms, and improved particle swarm algorithms.

[0140] Furthermore, the establishment of the oilfield standard well engineering pricing quota database is often determined based on the average value of data over the years in the oilfield, and the costs are compiled based on relevant data such as standard design, relevant industry specifications and cycles, drill bits, drilling fluids, cement, and admixture consumption quotas.

[0141] The wellbore trajectory pre-evaluation module is used for the pre-evaluation of the wellbore trajectory, providing certain references for the optimization of the wellbore structure, the selection of rigs and drilling tools, and the determination of hydraulic parameters during the later drilling engineering design process.

[0142] Specifically, the designed trajectory should utilize professional software in advance. Based on the designed trajectory data, analyses such as casing tensile capacity analysis, rig load-bearing capacity analysis, casing running-in capacity analysis, drilling hydraulics analysis, and wellbore stability analysis should be carried out to evaluate the rationality of the trajectory in advance.

[0143] Furthermore, the selection of the rig and drill tools, as well as the design of hydraulic parameters, should also be considered in advance. Simulative analysis should be conducted for the early deployment of the rig, the preparation of drill tools, and the hydraulic parameters during the drilling process, providing a theoretical basis for the subsequent drilling design and construction in advance.

[0144] For the steps of the above parameters and each unit module in a multi-target drilling wellbore trajectory determination system of the present invention to achieve corresponding functions, reference can be made to the parameters and steps in the embodiments of a multi-target drilling wellbore trajectory determination method in the above text, which will not be elaborated here.

[0145] A storage medium according to an embodiment of the present invention stores instructions, which, when read by a computer, cause the computer to execute a multi-target drilling wellbore trajectory determination method as described in any one of the above.

[0146] An electronic device according to an embodiment of the present invention includes a processor and the above storage medium. The processor executes the instructions in the storage medium. Among them, the electronic device can be a computer, a mobile phone, etc.

[0147] Those skilled in the art know that the present invention can be implemented as a system, a method, or a computer program product.

[0148] Therefore, the present disclosure can be specifically implemented in the following forms: it can be completely hardware, can be completely software (including firmware, resident software, microcode, etc.), or can be a combination of hardware and software, generally referred to as "circuit", "module", or "system" in this article. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, which contain computer-readable program codes.

[0149] Any combination of one or more computer-readable media may be employed. The computer-readable media may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present document, a computer-readable storage medium may be any tangible medium that contains or stores a program which can be used by or in connection with an instruction execution system, apparatus, or device.

[0150] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art may make variations, modifications, substitutions, and alterations within the scope of the present invention to the above embodiments.

Claims

1. A method for determining the wellbore trajectory of a multi-target well, characterized in that, Including: Obtain a distribution map of the oil and gas reservoirs in the oil and gas area to be exploited, and determine the main oil and gas area and the remaining oil and gas area of the oil and gas area to be exploited according to the distribution map; Determine the positions of at least one main target according to the main oil and gas area, and determine the positions of at least one standby target according to the remaining oil and gas area; According to the position of any main target and the preset drilling engineering parameters for the main wellbore, and use a two-dimensional trajectory calculation model to perform trajectory calculation to obtain the trajectory of the main wellbore corresponding to this main target until multiple trajectories of the main wellbore are obtained; According to the wellbore structure data of the main wellbore and the position of any standby target, obtain multiple undetermined feasible positions of the sidetracking points corresponding to this standby target until all undetermined feasible positions of the sidetracking points corresponding to each standby target are obtained; Design the trajectories of the sidetrack wellbores corresponding to each sidetracking point according to the undetermined feasible positions of each sidetracking point; Determine the target wellhead range according to all the trajectories of the main wellbore, all the trajectories of each sidetrack wellbore, and the environmental assessment chart of the oil and gas area to be exploited; Select the trajectory of the main wellbore with the wellhead position within the target wellhead range as the first target trajectory, and select the trajectory of the sidetrack wellbore with the wellhead position within the target wellhead range as the second target trajectory; Respectively judge whether the drilling process data of each first target trajectory is reasonable, and respectively judge whether the drilling process data of each second target trajectory is reasonable; Determine the final trajectory of the main wellbore from all the reasonable first target trajectories, and determine the final trajectory of each sidetrack wellbore from all the reasonable second target trajectories corresponding to each sidetrack wellbore.

2. The multi-target drilling wellbore trajectory determination method according to claim 1, wherein Determining the final trajectory of the main wellbore from all the reasonable first target trajectories includes: When the number of reasonable first target trajectories is 1, determine this reasonable first target trajectory as the final trajectory of the main wellbore; When the number of reasonable first target trajectories is at least 2, determine the reasonable first target trajectory with the lowest cost as the final trajectory of the main wellbore.

3. The multi-target wellbore trajectory determination method according to claim 1, wherein The process of determining the final trajectory of any sidetrack wellbore includes: When the number of reasonable second target trajectories corresponding to any sidetrack wellbore is 1, determine this reasonable second target trajectory as the final trajectory of this sidetrack wellbore; When the number of reasonable second target trajectories corresponding to any sidetrack wellbore is at least 2, determine the reasonable second target trajectory with the lowest cost as the final trajectory of this sidetrack wellbore.

4. A method for determining the wellbore trajectory of a multi-target well drilling according to claim 1, characterized in that, The drilling process data includes: casing running capacity data, drilling hydraulics data, and wellbore stability data.

5. A multi-target wellbore trajectory determination system for drilling, characterized in that, Including an acquisition and determination module, a target determination module, a trajectory determination module, a wellhead range determination module, a selection module, a judgment module, and a final trajectory determination module; The determination module is used to: obtain a distribution map of the oil and gas reservoirs in the oil and gas area to be exploited, and determine the main oil and gas area and the remaining oil and gas area of the oil and gas area to be exploited according to the distribution map; The target determination module is used to: determine the positions of at least one main target according to the main oil and gas area, and determine the positions of at least one standby target according to the remaining oil and gas area; The trajectory determination module is used to: Based on the position of any main target point and the drilling engineering parameters preset for the main wellbore, and using a two-dimensional trajectory calculation model to perform trajectory calculation, the trajectory of the main wellbore corresponding to the main target point is obtained until multiple trajectories of the main wellbore are obtained; Based on the wellbore structure data of the main wellbore and the position of any standby target point, multiple undetermined feasible positions of the sidetracking point corresponding to the standby target point are obtained until all undetermined feasible positions of the sidetracking point corresponding to each standby target point are obtained; Based on the undetermined feasible positions of each sidetracking point, the trajectories of the sidetrack wellbores corresponding to each sidetracking point are designed respectively; The wellhead range determination module is used to: determine the target wellhead range according to all the trajectories of the main wellbore, all the trajectories of each sidetrack wellbore, and the environmental assessment chart of the oil and gas area to be exploited; The selection module is used to: select the trajectory of the main wellbore with the wellhead position within the target wellhead range as the first target trajectory, and select the trajectory of the sidetrack wellbore with the wellhead position within the target wellhead range as the second target trajectory; The judgment module is used to: respectively judge whether the drilling process data of each first target trajectory is reasonable, and respectively judge whether the drilling process data of each second target trajectory is reasonable; The final trajectory determination module is used to: determine the final trajectory of the main wellbore from all the reasonable first target trajectories, and determine the final trajectory of each sidetrack wellbore from all the reasonable second target trajectories corresponding to each sidetrack wellbore.

6. The multi-target drilling wellbore trajectory determination system according to claim 5, characterized in that The process of the final trajectory determination module determining the final trajectory of the main wellbore from all the reasonable first target trajectories includes: When the number of reasonable first target trajectories is 1, determine this reasonable first target trajectory as the final trajectory of the main wellbore; When the number of reasonable first target trajectories is at least 2, determine the reasonable first target trajectory with the lowest cost as the final trajectory of the main wellbore.

7. A multi-target drilling wellbore trajectory determination system according to claim 5, characterized in that, The process of the final trajectory determination module determining the final trajectory of any sidetrack wellbore includes: When the number of reasonable second target trajectories corresponding to any sidetrack wellbore is 1, determine this reasonable second target trajectory as the final trajectory of this sidetrack wellbore; When the number of reasonable second target trajectories corresponding to any sidetrack wellbore is at least 2, determine the reasonable second target trajectory with the lowest cost as the final trajectory of this sidetrack wellbore.

8. A multi-target drilling wellbore trajectory determination system according to claim 5, characterized in that, The drilling process data includes: casing running capacity data, drilling hydraulics data, and wellbore stability data.

9. A storage medium, characterized in that, Instructions are stored in the storage medium, and when the computer reads the instructions, the computer is made to execute a method for determining the wellbore trajectory of a multi-target drilling as described in any one of claims 1 to 4.

10. An electronic device, characterized in that, It includes a processor and the storage medium described in claim 9, and the processor executes the instructions in the storage medium.

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