Anti-collision drilling method based on while-drilling magnetic exploration side

Abstract

The invention belongs to the technical field of petroleum and natural gas exploration and development, and particularly relates to an anti-collision drilling method based on a while-drilling magnetic exploration side. Comprising the steps that all drilled completed wells affected by construction of a to-be-drilled well in a construction area are preliminarily determined; according to the well logging data storage condition of the drilled well, a casing strong magnetic centralizer is put into all or part of the drilled well; the drill bit provided with the while-drilling magnetic detection monitoring tool is used for conducting drilling construction on the to-be-drilled well; in the drilling construction process, magnetic line distribution of the casing strong magnetic centralizer is obtained based on the while-drilling magnetic detection monitoring tool, and the distance between the current drilling well section in the to-be-drilled well and the adjacent well is further obtained; and determining and implementing direction-changing drilling anti-collision measures according to the distance between the current drilling well section and the adjacent well. According to the technical scheme, the current situation that an existing magnetic detection type underground anti-collision tool is narrow in application range is changed, the current related technical blank is filled up, and compared with the prior art, the anti-collision device has the advantage of being low in implementation cost.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas exploration and development technology, and particularly relates to an anti-collision drilling method based on magnetic exploration while drilling. Background Technology

[0002] In recent years, due to stricter environmental protection policies, the number of shale oil and gas wells using well cluster development models has increased year by year. Shale oil development in recent years has adopted multi-layered, large-well-cluster, and three-dimensional development models. For example, one platform deployed 31 horizontal wells with a wellhead spacing of 8 meters and a wellhead row spacing of 31 meters, creating significant pressure to prevent collisions in the diameter and deviated sections. Another oilfield deployed 73 vertical wells and highly deviated wells with wellhead spacing of 4-8 meters, making collision prevention in the deviated sections difficult. In older areas, adjustment and infill drilling are all conducted at the original well sites with limited area, making collision prevention between vertical wells difficult during new drilling. In 2021, a company deployed a pilot project to convert shale oil into small-spacing horizontal well clusters, creating an urgent need for collision prevention.

[0003] In existing technologies, the following research on anti-collision technologies has been conducted: First, the "Key Technologies for Horizontal Well Drilling in Shale Oil in the Cangdong Depression of Dagang Oilfield" addresses the technical challenges of poor PDC bit adaptability, difficulty in wellbore trajectory control, and poor wellbore stability in shale oil horizontal wells in different regions. It promotes aggressive parameter drilling, optimizes drill string combinations, conducts personalized PDC bit design, and selects optimal drilling fluid systems. Second, the "Key Technologies for Optimal and Fast Drilling and Completion in Fuxian Gas Reservoir" research analyzes engineering geological characteristics such as the mineral composition and physicochemical properties of the drilling formation, three-pressure profiles, and formation drillability. It establishes data models to optimize high-efficiency drill bits used in actual drilling, clarifying the types of drill bits used in each well section; it analyzes the application of drilling parameters through software simulation, clarifying aggressive drilling parameter schemes for different well types; and it also optimizes the polyamine drilling fluid system through indoor evaluation and field tests to ensure the stability of the mudstone wellbore. Third, "Application of Radical Drilling Technology in the Development of Tight Oil and Gas Reservoirs in Changqing" combines the selection of screw drills and PDC drill bits suitable for different well types, wellbore types, and formations to improve drilling speed and efficiency. Based on the theoretical understanding of increasing mechanical drilling rate by the maximum bottom hole flow velocity and the sensitivity analysis of drilling pressure / rotation speed to mechanical drilling rate, field tests of large-displacement, high-drilling pressure, and high-rotation radical drilling were conducted. Templates for radical drilling parameters for different well types and well sections were established, achieving large-scale speed improvement in the same area. Fourth, "Integration of High-Efficiency Development Technologies for Block 38 in Jiangsu Oilfield" integrates high-efficiency development technologies suitable for Jiangsu Oilfield, based on a series of technologies including well factory model and overall optimization design technology, wellbore structure optimization technology, selection of personalized PDC drill bits + long-life equal-wall-thickness screw drills + high-pressure injection technology, friction reduction and drag reduction for complex wellbore trajectories, and environmentally friendly starch-based drilling fluid systems. Fifth, the "Drilling Technology for Second-Stage Horizontal Wells in the Sulige Risk Cooperation Block" project has carried out research on optimizing the "factory-style" horizontal well drilling mode, the "high-efficiency PDC drill bit + high-power screw" aggressive parameter drilling technology, optimizing the well trajectory control mode with different offset distances, and optimizing the segmented drilling fluid of the strong-inhibition low-density CQSP-4 anti-collapse drilling fluid, which has formed the optimal and fast drilling technology for horizontal wells in the tight gas reservoirs of the Sulige gas field.

[0004] The aforementioned data addresses the issues of downhole collision prevention applications and safe and rapid drilling, primarily focusing on collision prevention research from aspects such as on-site measures, drill string improvements, well trajectory optimization, and real-time 3D visualization of wellbore trajectories. However, this research suffers from problems such as high costs, complex execution, and impact on drilling efficiency. Furthermore, for drilling data from the 1990s and earlier, due to their age and preservation methods, the data accuracy is poor or even missing, resulting in unprecedented pressure on collision prevention work during secondary operations. Therefore, the aforementioned existing technologies are not applicable. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a collision-avoidance drilling method based on magnetic detection while drilling. This method aims to meet the requirements of different production needs for accurate magnetic detection and collision avoidance, reduce drilling and completion costs, and provide data support for subsequent remote technical support. Specifically: A collision-avoidance drilling method based on magnetic side-finding during drilling includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all the completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to the well to be drilled; S2, based on the preservation status of logging data of completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or some of the adjacent wells in the adjacent well group; S3, after installing the magnetic detection monitoring tool while drilling on the drill bit, the drilling operation is carried out on the well to be drilled; S4, During the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling; S5, based on the magnetic field distribution of the casing strong magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled; S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

[0006] Preferably, in step S2, if the corresponding logging data is not retained, casing magnetic centralizers are installed in all drilled wells in adjacent well groups; if the corresponding logging data is retained, the installation of casing magnetic centralizers includes the following steps: S21. Based on the corresponding logging data, obtain the wellbore trajectories of all completed wells in the adjacent well group to establish a spatial wellbore trajectory map of the adjacent well group. S22, Based on the spatial wellbore trajectory map of the adjacent well group, obtain the spatial location of each completed well in the adjacent well group, as well as the minimum distance S between them and the well to be drilled; S23. For each completed well in the adjacent well group, determine whether the minimum spacing S is greater than the set safety value; if not, run a casing strong magnetic stabilizer into the corresponding completed well; if so, remove the corresponding completed well from the adjacent well group.

[0007] Preferably, in step S4, obtaining the magnetic field distribution of the sleeve-type strong magnetic centralizer includes the following steps: S41, the magnetic detection tool while drilling detects the magnetic lines of force of the corresponding casing magnetic stabilizer and uploads the detection data to the ground computer; S42, the ground computer analyzes and obtains the magnetic field distribution of the casing strong magnetic centralizer based on the received detection data, and displays it on the monitor.

[0008] Preferably, in step S41, the magnetic detection monitoring tool while drilling detects magnetic field lines by regularly emitting electromagnetic waves.

[0009] Preferably, in step S41, the detection data is uploaded to the ground computer via a downhole MWD instrument.

[0010] Preferably, in step S6, the anti-collision measures for directional drilling are divided into three levels, with the distance between the current drilling section and the adjacent well being N; if 20m < N, no anti-collision measures are taken; if 15m < N ≤ 20, a level three slow directional drilling anti-collision measure is adopted; if 10m < N ≤ 15m, a level two accelerated directional drilling anti-collision measure is adopted; and if N ≤ 10m, a level one emergency directional drilling anti-collision measure is adopted.

[0011] Preferably, the three-stage slow-change drilling anti-collision measure is to activate the downhole rotary guide tool at the wellhead, so that the drilling trajectory of the well to be drilled changes direction around the obstacle at an angle of 3° every 30 meters.

[0012] Preferably, the secondary accelerated directional drilling anti-collision measure is to activate the downhole rotary guide tool at the wellhead, so that the drilling trajectory of the well to be drilled changes direction around the obstacle at an angle of 5° every 30 meters.

[0013] Preferably, the first-level emergency deflection drilling anti-collision measure is to activate the downhole rotary guide tool at the wellhead, so that the drilling trajectory of the well to be drilled changes direction around the obstacle at an angle of 6° every 30 meters.

[0014] Preferably, in step S6, before implementing the anti-collision measures, the following steps are also included: S61, determine the well number of the adjacent well to be avoided based on the distribution of magnetic field lines; S62, based on the well number, combined with the spatial wellbore trajectory diagram of the adjacent well group, analyze the wellbore trajectory of the adjacent well to be avoided; S63, determine the direction of the change of direction drilling based on the wellbore trajectory of the adjacent well to be avoided.

[0015] The beneficial effects of this invention are: This technical solution proposes a collision-avoidance drilling method based on magnetic detection while drilling, which changes the current situation where the application scope of magnetic detection downhole collision-avoidance tools is relatively narrow and fills the current technological gap. Compared with existing technologies, it has the characteristics of low implementation cost. In addition, by carrying out real-time detection during drilling operations, it does not affect drilling efficiency, is simple to execute, and can provide data basis for subsequent remote technical support.

[0016] This technical solution takes into account the different penetration capabilities of magnetic field lines in different formations and divides the anti-collision measures for directional drilling into three levels. This ensures that after the implementation of the anti-collision measures for directional drilling, the distance between the drilling section and the casing of the adjacent well meets the requirements of volumetric fracturing. Attached Figure Description

[0017] Figure 1 This is a basic implementation flowchart of the technical solution; Figure 2 This is a comparative diagram of the three-stage anti-collision measures for directional drilling in this technical solution.

[0018] In the picture: 1. Well to be drilled; 2. Adjacent well; 3. Change of direction. Detailed Implementation

[0019] To make the purpose, technical solution and advantages of the invention clearer, the technical solution of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the invention, but not all embodiments.

[0020] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] Example 1 This embodiment discloses a collision-avoidance drilling method based on magnetic side detection during drilling. As a basic implementation of the present invention, it includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all the completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to the well to be drilled.

[0022] S2, based on the preservation status of logging data of completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or part of the adjacent wells in the adjacent well group.

[0023] S3. After installing the magnetic detection monitoring tool while drilling on the drill bit, drilling operations are carried out on the well to be drilled.

[0024] S4, during the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling.

[0025] S5, based on the magnetic field distribution of the casing magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled.

[0026] S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

[0027] This technical solution involves deploying a magnetic detection monitoring tool while drilling during the drilling process to conduct all-round real-time magnetic detection on the casing of adjacent wells during drilling, so as to obtain the actual distance between the drilling well and the adjacent wells, and use this actual distance as the basis for implementing deflection and collision prevention measures.

[0028] Example 2 This embodiment discloses a collision-avoidance drilling method based on magnetic side-finding during drilling. As a preferred embodiment of the present invention, it includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all the completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to the well to be drilled.

[0029] S2, based on the preservation status of logging data of completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or part of the adjacent wells in the adjacent well group.

[0030] Specifically, without retaining the corresponding logging data, all drilled wells in adjacent well groups have had their casing magnetic centralizers installed; if the corresponding logging data has been retained, the installation of the casing magnetic centralizer includes the following steps: S21. Based on the corresponding logging data, obtain the wellbore trajectories of all completed wells in the adjacent well group to establish a spatial wellbore trajectory map of the adjacent well group.

[0031] S22, based on the spatial wellbore trajectory map of the adjacent well group, obtain the spatial location of each completed well in the adjacent well group, as well as the minimum distance S between them and the well to be drilled.

[0032] S23. For each completed well in the adjacent well group, determine whether the minimum spacing S is greater than the set safety value; if not, run a casing strong magnetic stabilizer into the corresponding completed well; if so, remove the corresponding completed well from the adjacent well group.

[0033] S3. After installing the magnetic detection monitoring tool while drilling on the drill bit, drilling operations are carried out on the well to be drilled.

[0034] S4, during the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling.

[0035] S5, based on the magnetic field distribution of the casing magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled.

[0036] S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

[0037] Example 3 This embodiment discloses a collision-avoidance drilling method based on magnetic side-finding during drilling. As a preferred embodiment of the present invention, it includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all the completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to the well to be drilled.

[0038] S2, based on the preservation status of logging data of completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or part of the adjacent wells in the adjacent well group.

[0039] Specifically, without retaining the corresponding logging data, all drilled wells in adjacent well groups have had their casing magnetic centralizers installed; if the corresponding logging data has been retained, the installation of the casing magnetic centralizer includes the following steps: S21. Based on the corresponding logging data, obtain the wellbore trajectories of all completed wells in the adjacent well group to establish a spatial wellbore trajectory map of the adjacent well group.

[0040] S22, based on the spatial wellbore trajectory map of the adjacent well group, obtain the spatial location of each completed well in the adjacent well group, as well as the minimum distance S between them and the well to be drilled.

[0041] S23. For each completed well in the adjacent well group, determine whether the minimum spacing S is greater than the set safety value; if not, run a casing strong magnetic stabilizer into the corresponding completed well; if so, remove the corresponding completed well from the adjacent well group.

[0042] S3. After installing the magnetic detection monitoring tool while drilling on the drill bit, drilling operations are carried out on the well to be drilled.

[0043] S4, during the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling.

[0044] S5, based on the magnetic field distribution of the casing magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled.

[0045] S6. Determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and adjacent wells. Furthermore, before implementing the anti-collision measures, the following steps are also included: S61, determine the well number of the adjacent well to be avoided based on the distribution of magnetic field lines; S62, based on the well number, combined with the spatial wellbore trajectory diagram of the adjacent well group, analyze the wellbore trajectory of the adjacent well to be avoided; S63, determine the direction of the change-direction drilling based on the wellbore trajectory of the adjacent well to be avoided. Then, implement collision avoidance measures during subsequent change-direction drilling in the determined direction.

[0046] Example 4 This embodiment discloses a collision-avoidance drilling method based on magnetic side-finding during drilling. As a preferred embodiment of the present invention, it includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all the completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to the well to be drilled.

[0047] S2, based on the preservation status of logging data of completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or part of the adjacent wells in the adjacent well group.

[0048] S3. After installing the magnetic detection monitoring tool while drilling on the drill bit, drilling operations are carried out on the well to be drilled.

[0049] S4, during the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling.

[0050] The process of obtaining the magnetic field distribution of the bushing magnetic stabilizer includes the following steps: S41, the magnetic field monitoring tool while drilling detects the magnetic field lines of the corresponding casing magnetic stabilizer and uploads the detection data to the ground computer. The magnetic field monitoring tool detects magnetic field lines by regularly emitting electromagnetic waves.

[0051] S42, the ground computer analyzes the received detection data to obtain the magnetic field distribution of the casing magnetic centralizer, and displays it on the monitor. Further, the detection data is uploaded to the ground computer via a downhole MWD instrument.

[0052] S5, based on the magnetic field distribution of the casing magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled.

[0053] S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

[0054] The magnetic detection principle of the drilling magnetic detection monitoring tool is as follows: during the drilling process, electromagnetic waves are emitted. The emitted electromagnetic waves can detect the magnetic lines of force on the casing at a certain distance. By analyzing the detected magnetic lines of force, the azimuth distance between the tool and the casing of the adjacent well can be determined, thus preventing accidents where the drilled wellbore collides with the adjacent well.

[0055] Example 5 This embodiment discloses a collision-avoidance drilling method based on magnetic side-finding during drilling. As a preferred embodiment of the present invention, it includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all the completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to the well to be drilled.

[0056] S2, based on the preservation status of logging data of completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or part of the adjacent wells in the adjacent well group.

[0057] S3. After installing the magnetic detection monitoring tool while drilling on the drill bit, drilling operations are carried out on the well to be drilled.

[0058] S4, during the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling.

[0059] S5, based on the magnetic field distribution of the casing magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled.

[0060] S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

[0061] Among them, the penetrating power of magnetic field lines varies in different formations due to different formation properties, which makes the distance at which the magnetic field lines can be detected by the drilling magnetic exploration monitoring tool vary. Based on this, the technical solution implements three levels of anti-collision measures for directional drilling, making the distance between the current drilling section and the adjacent well N. If 20m < N, then no collision prevention measures are required.

[0062] If 15m < N ≤ 20, a three-stage slow-change drilling anti-collision measure is adopted, namely: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled changes direction around the obstacle at an angle of 3° every 30 meters.

[0063] If 10m < N ≤ 15m, then a two-stage accelerated directional drilling anti-collision measure is adopted, that is: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled is changed around the obstacle at an angle of 5° every 30 meters.

[0064] If N≤10m, then the first-level emergency deflection drilling anti-collision measures are adopted, that is: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled is deflected around the obstacle at an angle of 6° every 30 meters.

[0065] This ensures that after implementing anti-collision measures for directional drilling, the distance between the drilling section and the casing of the adjacent well is greater than 6m (set according to the specific formation properties), meeting the requirements of volumetric fracturing.

[0066] Example 6 This embodiment addresses a secondary operation in a mining area that has been out of production for a long time. Having identified the area to be drilled, it employs a collision-avoidance drilling method based on magnetic side-finding during drilling, as described in this technical solution, to perform new well (well to be drilled) drilling operations in the area. The method includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all 8 completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to be drilled.

[0067] S2, based on the logging data of the 8 completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or some of the adjacent wells in the adjacent well group.

[0068] Specifically, for drilled and completed wells where logging data has not been retained, it is determined that a casing magnetic centralizer needs to be installed; for drilled and completed wells where relevant logging data has been retained, the installation of the casing magnetic centralizer includes the following steps: S21. Based on the corresponding logging data, obtain the wellbore trajectory of the corresponding completed wells in the adjacent well group to establish a spatial wellbore trajectory map of the adjacent well group.

[0069] S22, based on the spatial wellbore trajectory map of the adjacent well group, obtain the spatial location of each completed well in the adjacent well group, as well as the minimum distance S between them and the well to be drilled.

[0070] S23. For each completed well in the adjacent well group, determine whether the minimum spacing S is greater than the set safety value; if not, run a casing magnetic stabilizer into the corresponding completed well; if so, remove the corresponding completed well from the adjacent well group. This can simplify additional operations beyond new well drilling to some extent.

[0071] S3. After installing the magnetic detection monitoring tool while drilling on the drill bit, drilling operations are carried out on the well to be drilled.

[0072] S4, during the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling.

[0073] The process of obtaining the magnetic field distribution of the bushing magnetic stabilizer includes the following steps: S41, the magnetic field monitoring tool while drilling detects the magnetic field lines of the corresponding casing magnetic stabilizer and uploads the detection data to the ground computer. The magnetic field monitoring tool detects magnetic field lines by regularly emitting electromagnetic waves.

[0074] S42, the ground computer analyzes the received detection data to obtain the magnetic field distribution of the casing magnetic centralizer, and displays it on the monitor. Further, the detection data is uploaded to the ground computer via a downhole MWD instrument.

[0075] S5, based on the magnetic field distribution of the casing magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled.

[0076] S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

[0077] The steps included before implementing collision avoidance measures are as follows: S61, determine the well number of the adjacent well to be avoided based on the distribution of magnetic field lines.

[0078] S62, based on the well number, analyze the well trajectory of the adjacent well to be avoided by combining the spatial well trajectory diagram of the adjacent well group.

[0079] S63, determine the direction of the change of direction drilling based on the wellbore trajectory of the adjacent well to be avoided.

[0080] Furthermore, the anti-collision measures for directional drilling are divided into three levels, with the distance between the current drilling section and the adjacent well being N; If 20m < N, then no collision prevention measures are required.

[0081] If 15m < N ≤ 20, a three-stage slow-change drilling anti-collision measure is adopted, namely: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled changes direction around the obstacle at an angle of 3° every 30 meters.

[0082] If 10m < N ≤ 15m, then a two-stage accelerated directional drilling anti-collision measure is adopted, that is: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled is changed around the obstacle at an angle of 5° every 30 meters.

[0083] If N≤10m, then the first-level emergency deflection drilling anti-collision measures are adopted, that is: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled is deflected around the obstacle at an angle of 6° every 30 meters.

[0084] The details are shown in the table below: Example 7 This embodiment implements a collision-avoidance drilling method based on magnetic side-tracking during drilling in a newly developed area. First, it was determined that 10 wells needed to be drilled in this new development area, and these 10 wells were divided into two groups for operation. First, the first group of 5 wells was drilled at long intervals, and the logging data of these 5 wells was retained. These 5 wells were then used as adjacent wells for subsequent new well drilling operations, and casing magnetic stabilizers were installed in each of them. Then, for the second group of 5 wells, drilling operations were carried out through the following steps: S1. Based on the work area to be drilled by the new well (well to be drilled), it is preliminarily determined that all the completed wells in the first group of 5 wells are affected by the construction of the well to be drilled. These completed wells constitute the adjacent well group of the well to be drilled.

[0085] S2. Based on the corresponding logging data, obtain the wellbore trajectory of the corresponding completed wells in the adjacent well group to establish a spatial wellbore trajectory map of the adjacent well group. S3. After installing the magnetic detection monitoring tool while drilling on the drill bit, drilling operations are carried out on the well to be drilled.

[0086] S4, during the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling.

[0087] The process of obtaining the magnetic field distribution of the bushing magnetic stabilizer includes the following steps: S41, the magnetic field monitoring tool while drilling detects the magnetic field lines of the corresponding casing magnetic stabilizer and uploads the detection data to the ground computer. The magnetic field monitoring tool detects magnetic field lines by regularly emitting electromagnetic waves.

[0088] S42, the ground computer analyzes the received detection data to obtain the magnetic field distribution of the casing magnetic centralizer, and displays it on the monitor. Further, the detection data is uploaded to the ground computer via a downhole MWD instrument.

[0089] S5, based on the magnetic field distribution of the casing magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled.

[0090] S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

[0091] The steps included before implementing collision avoidance measures are as follows: S61, determine the well number of the adjacent well to be avoided based on the distribution of magnetic field lines.

[0092] S62, based on the well number, analyze the well trajectory of the adjacent well to be avoided by combining the spatial well trajectory diagram of the adjacent well group.

[0093] S63, determine the direction of the change of direction drilling based on the wellbore trajectory of the adjacent well to be avoided.

[0094] Furthermore, the anti-collision measures for directional drilling are divided into three levels, with the distance between the current drilling section and the adjacent well being N; If 20m < N, then no collision prevention measures are required.

[0095] If 15m < N ≤ 20, a three-stage slow-change drilling anti-collision measure is adopted, namely: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled changes direction around the obstacle at an angle of 3° every 30 meters.

[0096] If 10m < N ≤ 15m, then a two-stage accelerated directional drilling anti-collision measure is adopted, that is: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled is changed around the obstacle at an angle of 5° every 30 meters.

[0097] If N≤10m, then the first-level emergency deflection drilling anti-collision measures are adopted, that is: by starting the downhole rotary guide tool at the wellhead, the drilling trajectory of the well to be drilled is deflected around the obstacle at an angle of 6° every 30 meters.

Claims

1. A collision-avoidance drilling method based on magnetic side-finding during drilling, characterized in that, Includes the following steps: S1. Observe the construction area where the well to be drilled is located, and preliminarily determine all the completed wells in the construction area that are affected by the construction of the well to be drilled, forming a well group of adjacent wells to the well to be drilled; S2, based on the preservation status of logging data of completed wells in the adjacent well group, insert casing strong magnetic centralizers into all or some of the adjacent wells in the adjacent well group; S3, after installing the magnetic detection monitoring tool while drilling on the drill bit, the drilling operation is carried out on the well to be drilled; S4, During the drilling process of the well to be drilled, the magnetic field distribution of the casing magnetic centralizer is obtained based on the magnetic detection monitoring tool while drilling; S5, based on the magnetic field distribution of the casing strong magnetic stabilizer, obtain the distance between the current drilling section and the adjacent well in the well to be drilled; S6, determine and implement anti-collision measures for directional drilling based on the distance between the current drilling section and the adjacent well.

2. The anti-collision drilling method based on magnetic side detection while drilling as described in claim 1, characterized in that, In step S2, without retaining the corresponding logging data, all drilled wells in the adjacent well group are fitted with casing magnetic stabilizers; if the corresponding logging data is retained, the casing magnetic stabilizer fitting process includes the following steps: S21. Based on the corresponding logging data, obtain the wellbore trajectories of all completed wells in the adjacent well group to establish a spatial wellbore trajectory map of the adjacent well group. S22, Based on the spatial wellbore trajectory map of the adjacent well group, obtain the spatial location of each completed well in the adjacent well group, as well as the minimum distance S between them and the well to be drilled; S23. For each completed well in the adjacent well group, determine whether the minimum spacing S is greater than the set safety value; if not, run a casing strong magnetic stabilizer into the corresponding completed well; if so, remove the corresponding completed well from the adjacent well group.

3. The anti-collision drilling method based on magnetic side detection while drilling as described in claim 1, characterized in that, In step S4, obtaining the magnetic field distribution of the sleeve-type strong magnetic centralizer includes the following steps: S41, the magnetic detection tool while drilling detects the magnetic lines of force of the corresponding casing magnetic stabilizer and uploads the detection data to the ground computer; S42, the ground computer analyzes and obtains the magnetic field distribution of the casing strong magnetic centralizer based on the received detection data, and displays it on the monitor.

4. The anti-collision drilling method based on magnetic side detection while drilling as described in claim 3, characterized in that, In step S41, the magnetic detection monitoring tool while drilling detects magnetic field lines by regularly emitting electromagnetic waves.

5. The anti-collision drilling method based on magnetic side detection while drilling as described in claim 3, characterized in that, In step S41, the detection data is uploaded to the ground computer via a downhole MWD instrument.

6. The anti-collision drilling method based on magnetic side detection as described in claim 1, characterized in that, In step S6, the anti-collision measures for directional drilling are divided into three levels, with the distance between the current drilling section and the adjacent well being N. If 20m < N, then no collision prevention measures should be taken; If 15m < N ≤ 20, then a three-stage slow-change-direction drilling anti-collision measure shall be adopted; If 10m < N ≤ 15m, then a two-stage accelerated directional drilling anti-collision measure shall be adopted; If N≤10m, then the first-level emergency directional drilling anti-collision measures shall be adopted.

7. The anti-collision drilling method based on magnetic side detection while drilling as described in claim 6, characterized in that, The aforementioned three-stage slow-change drilling anti-collision measure involves activating a downhole rotary guide tool at the wellhead, causing the drilling trajectory of the well to be drilled to change direction around the obstacle at an angle of 3° every 30 meters.

8. The anti-collision drilling method based on magnetic side detection as described in claim 6, characterized in that, The aforementioned secondary accelerated directional drilling anti-collision measure involves activating a downhole rotary guide tool at the wellhead, causing the drilling trajectory of the well to be drilled to change direction around obstacles at an angle of 5° every 30 meters.

9. The anti-collision drilling method based on magnetic side detection as described in claim 6, characterized in that, The first-level emergency deflection drilling anti-collision measure is to activate the downhole rotary guide tool at the wellhead, so that the drilling trajectory of the well to be drilled changes direction around the obstacle at an angle of 6° every 30 meters.

10. The anti-collision drilling method based on magnetic side detection as described in claim 2, characterized in that, In step S6, before implementing the anti-collision measures, the following steps are also included: S61, determine the well number of the adjacent well to be avoided based on the distribution of magnetic field lines; S62, based on the well number, combined with the spatial wellbore trajectory diagram of the adjacent well group, analyze the wellbore trajectory of the adjacent well to be avoided; S63, determine the direction of the change of direction drilling based on the wellbore trajectory of the adjacent well to be avoided.

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