A ranging method, related method and system for a batch of horizontal well groups and application

Abstract

The application provides a ranging method for a batch of horizontal well groups, a related method and system and application. The method comprises the following steps: lowering a magnetic field generator into a horizontal section of a well to be drilled and moving the magnetic field generator along with a well trajectory control system; lowering two groups of magnetic field strength detectors into two drilled wells which meet the following conditions: the well distance between the horizontal sections of the two drilled wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance, the horizontal sections of the two drilled wells are located at different positions around the horizontal section of the well to be drilled, and the included angle between the connecting line of the center lines of the horizontal section of the well to be drilled and the horizontal sections of the two drilled wells is greater than or equal to a first preset angle; controlling the interval of the vertical planes of the two groups of magnetic field strength detectors to be less than a second preset distance, and moving the two groups of magnetic field strength detectors in the corresponding drilled well sections synchronously; and transmitting the magnetic field strength data of the two groups of magnetic field strength detectors to a data analysis system through a data transmission system to determine the spatial position of the magnetic field generator.

Description

TECHNICAL FIELD

[0001] The present application relates to a method for measuring distance of a batch horizontal well group, a related method and system and application. BACKGROUND

[0002] With the development of oil and gas into new areas, the requirements for drilling technology are higher and higher, and the requirements for well trajectory positioning accuracy are also higher and higher. For example, parallel well drilling technology of steam assisted gravity drainage requires drilling relatively parallel paired horizontal wells, and for example, in-situ conversion development of oil and gas resources requires drilling a batch of relatively parallel horizontal well groups. In order to complete such special wells, magnetic distance measurement is generally required to measure the spatial distance and orientation between wellbores and to adjust and control them to ensure the accuracy of the spatial position between well trajectories. In order to complete such operations, the current magnetic distance measurement methods mainly include: for parallel well groups using open hole or screen completion, a magnetic field detection device is placed in a drilled well, and a magnetic field generator with a known intensity and a known magnetic field mode is installed in a well being drilled. The relative distance between the two wells is calculated by measuring the magnetic field, thereby guiding the drilling operation, such as U.S. Patents Nos. 5485089 and 5589775. This method is widely used in parallel well drilling of steam assisted gravity drainage, and achieves a control accuracy of ±0.5m in vertical error and ±1m in horizontal error under the condition of 5m spacing of vertical paired horizontal wells. When drilling a batch of relatively parallel horizontal well groups, since the spatial relative positions of the horizontal sections of multiple wells are relatively fixed, not only is it required to stabilize the spacing of the horizontal sections of multiple wells, but also it is required to fix the spatial relative orientation of the horizontal sections of multiple wells, and therefore, the control accuracy of well trajectory is required to be higher. SUMMARY

[0003] The inventors found that in the magnetic distance measurement method in the prior art, the control accuracy of the conventional magnetic guide tool and its process mainly reflects in ensuring distance measurement, and the orientation accuracy is low. Therefore, the existing magnetic guide operation mode is difficult to meet the requirements of high-precision well trajectory control accuracy in a batch of horizontal well groups, and is prone to cause the risk of well trajectory intersection. In order to at least partially solve the technical problems existing in the prior art, the inventors make the present application, and through specific embodiments, the technical solutions provided are as follows:

[0004] As a first aspect of an embodiment of the present application, the present application provides a method for measuring distance of a batch horizontal well group, comprising:

[0005] lowering a magnetic field generator into the horizontal section of the well to be drilled along with a well trajectory control system, and moving the magnetic field generator along with the well trajectory control system;

[0006] Select two completed wells that meet the following conditions: the distance between the horizontal section of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the horizontal sections of the two completed wells are located at different positions around the horizontal section of the well to be drilled; and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle.

[0007] Two sets of magnetic field strength detectors were respectively lowered into the corresponding horizontal sections of the completed well.

[0008] The vertical distance between the two sets of magnetic field strength detectors is controlled to be less than a second preset distance, and the two sets of magnetic field strength detectors move synchronously in the corresponding completed well horizontal section.

[0009] The magnetic field strength data from the two sets of magnetic field strength detectors are transmitted to the data analysis system through the data transmission system.

[0010] The spatial location of the magnetic field generator is determined by the data analysis system.

[0011] In one or more optional embodiments, determining the spatial location of the magnetic field generator through the data analysis system includes:

[0012] Based on the magnetic field strength obtained from the two sets of magnetic field strength detectors, the distance between the two sets of magnetic field strength detectors and the magnetic field generator is determined;

[0013] Based on the insertion depth of the two sets of magnetic field strength detectors and the wellbore trajectory data of the corresponding completed wells, the spatial positions of the two sets of magnetic field strength detectors are determined.

[0014] The spatial position of the magnetic field generator is determined based on the spatial positions of the two sets of magnetic field strength detectors and the distance between the two sets of magnetic field strength detectors and the magnetic field generator.

[0015] In one or more optional embodiments, determining the spatial position of the magnetic field generator based on the spatial positions of the two sets of magnetic field strength detectors and the distance between the two sets of magnetic field strength detectors and the magnetic field generator includes:

[0016] Two circles are determined, each with its center as the center and the distance between the two sets of magnetic field strength detectors and the magnetic field generator as its radius. The two intersection points of the two circles are obtained.

[0017] Based on the spatial positions of the two sets of magnetic field strength detectors, the spatial position of the magnetic field generator is obtained from the two intersection points.

[0018] In one or more optional embodiments, the ranging method further includes:

[0019] Based on the determined spatial positions of the magnetic field generator at multiple different times, the actual wellbore trajectory of the horizontal section to be drilled is determined.

[0020] In one or more optional embodiments, the step of lowering the two sets of magnetic field strength detectors into the corresponding completed well horizontal sections includes:

[0021] The two sets of magnetic field strength detectors are lowered into the corresponding horizontal sections of the completed well using coiled tubing or coupling tubing.

[0022] In one or more optional embodiments, the ranging method further includes:

[0023] The positions of the two sets of magnetic field strength detectors and the position of the magnetic field generator are both controlled to be less than or equal to a second preset distance.

[0024] As a second aspect of the present invention, the present invention provides a method for ranging batches of horizontal well groups, including:

[0025] The magnetic field generator is lowered into the horizontal section of the well to be drilled along with the wellbore trajectory control system, and the magnetic field generator is moved along with the wellbore trajectory control system.

[0026] Select two completed wells that meet the following conditions: the distance between the horizontal section of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the horizontal sections of the two completed wells are located at different positions around the horizontal section of the well to be drilled; and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle.

[0027] Two sets of magnetic field strength detectors were respectively lowered into the corresponding horizontal sections of the completed well.

[0028] The two sets of magnetic field strength detectors are respectively set on the front and rear sides of the magnetic field generator, the vertical distance between the two sets of magnetic field strength detectors is greater than a third preset distance, and the two sets of magnetic field strength detectors move alternately in the corresponding completed well horizontal section.

[0029] The magnetic field strength data from the two sets of magnetic field strength detectors are transmitted to the data analysis system through the data transmission system.

[0030] The spatial location of the magnetic field generator is determined by the data analysis system.

[0031] As a third aspect of the present invention, the present invention provides a ranging system for batch horizontal well groups, the ranging system comprising: a magnetic field generator, two sets of magnetic field strength detectors, a data transmission system, a data analysis system, and a wellbore trajectory control system;

[0032] The magnetic field generator can be lowered into the well to be drilled along with the wellbore trajectory control system, and can move along with the wellbore trajectory control system.

[0033] The two sets of magnetic field strength detectors can be lowered into different horizontal sections of the completed wells and can move along the wellbore trajectory of the horizontal section of the completed well.

[0034] The two sets of magnetic field strength detectors and the data analysis system are connected by a signal through the data transmission system;

[0035] In use, the two sets of magnetic field strength detectors are respectively lowered into the horizontal sections of two completed wells that meet the following conditions: the distance between the two completed well horizontal sections and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the two completed well horizontal sections are respectively located at different positions around the well of the horizontal section to be drilled; and the angle between the center line of the horizontal section to be drilled and the line connecting the center lines of the two completed well horizontal sections is greater than or equal to a first preset angle.

[0036] The two sets of magnetic field strength detectors are configured to be spaced less than a second preset distance in the vertical plane and can move synchronously within the corresponding completed horizontal section of the well.

[0037] The data analysis system is configured to determine the spatial location of the magnetic field generator based on the magnetic field strength data acquired from the two sets of magnetic field strength detectors.

[0038] In one or more optional embodiments, the data parsing system is specifically configured to determine the distance between the two sets of magnetic field strength detectors and the magnetic field generator based on the acquired magnetic field strength of the two sets of magnetic field strength detectors.

[0039] Based on the insertion depth of the two sets of magnetic field strength detectors and the wellbore trajectory data of the corresponding completed wells, the spatial positions of the two sets of magnetic field strength detectors are determined.

[0040] The spatial position of the magnetic field generator is determined based on the spatial positions of the two sets of magnetic field strength detectors and the distance between the two sets of magnetic field strength detectors and the magnetic field generator.

[0041] In one or more alternative embodiments, the data analysis system is further configured to determine the actual wellbore trajectory of the well to be completed based on the determined spatial location of the magnetic field generator at multiple different times.

[0042] In one or more alternative embodiments, the magnetic field strength detector is lowered into the horizontal section of the completed well with the assistance of coiled tubing or coupling tubing.

[0043] In one or more alternative embodiments, the wellbore trajectory control system includes a drill bit, with the magnetic field generator disposed at the rear end of the drill bit.

[0044] In one or more alternative embodiments, the wellbore trajectory control system further includes a guiding tool, an engineering parameter measuring device, and a geological parameter measuring device.

[0045] As a fourth aspect of the present invention, the present invention provides a ranging system for batch horizontal well groups, the ranging system comprising: a magnetic field generator, two sets of magnetic field strength detectors, a data transmission system, a data analysis system, and a wellbore trajectory control system;

[0046] The magnetic field generator can be lowered into the well to be drilled along with the wellbore trajectory control system, and can move along with the wellbore trajectory control system.

[0047] The magnetic field strength detector is lowered into the horizontal section of the completed well and can move along the wellbore trajectory of the horizontal section of the completed well;

[0048] The two sets of magnetic field strength detectors and the data analysis system are connected by a signal through the data transmission system;

[0049] In use, the two sets of magnetic field strength detectors are respectively lowered into the horizontal sections of two completed wells that meet the following conditions: the distance between the two completed well horizontal sections and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the two completed well horizontal sections are respectively located at different positions around the well of the horizontal section to be drilled; and the angle between the center line of the horizontal section to be drilled and the line connecting the center lines of the two completed well horizontal sections is greater than or equal to a first preset angle.

[0050] The two sets of magnetic field strength detectors are configured to be spaced less than a second preset distance in the vertical plane and can move synchronously within the corresponding completed drilling horizontal section;

[0051] The two sets of magnetic field strength detectors are configured with a vertical plane spacing greater than a third preset distance and are respectively set on the front and rear sides of the magnetic field generator, and can move alternately within the corresponding completed drilling horizontal section;

[0052] The data analysis system is configured to determine the spatial location of the magnetic field generator based on the magnetic field strength of the two sets of magnetic field strength detectors.

[0053] As a fifth aspect of the present invention, the present invention provides a drilling operation system, characterized in that it includes the above-described ranging system applied to a batch of horizontal well groups.

[0054] As a sixth aspect of the present invention, the present invention provides a method for determining the spatial position of a magnetic field generator, characterized in that it uses the above-described ranging system applied to a batch of horizontal well groups.

[0055] As a seventh aspect of the present invention, the present invention provides an application of the above-described ranging system for batch horizontal well groups in drilling operations.

[0056] The beneficial effects of the above-described technical solutions provided in the embodiments of the present invention include at least the following:

[0057] The ranging method for batch horizontal well groups provided in this invention involves lowering two sets of magnetic field strength detectors into two different completed wells. Since the distance between the selected horizontal sections of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance, and the two completed well sections are located at different azimuths around the horizontal section of the well to be drilled, and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed well sections is greater than or equal to a first preset angle, it is possible to use two sets of magnetic field strength detectors to locate the wellbore trajectory of the well to be drilled. Based on the magnetic field strength of the two sets of magnetic field strength detectors, the distance between the two sets of magnetic field strength detectors and the magnetic field generator is determined, thereby determining the accurate position of the magnetic field generator. This overcomes the problem of insufficient azimuth measurement accuracy of conventional magnetic guidance tools. The actual wellbore trajectory of the well to be drilled determined by this ranging system has a higher tolerance, which is beneficial to improving the control accuracy of the wellbore trajectory and facilitating the direction control of the wellbore trajectory in subsequent drilling guidance operations, preventing the wellbore trajectory of the well to be drilled from deviating from the preset wellbore trajectory. Attached Figure Description

[0058] Figure 1 A flowchart illustrating a method for measuring the distance of a batch of horizontal well groups provided in an embodiment of the present invention;

[0059] Figure 2 This is a schematic diagram of the structure of a batch horizontal well group ranging system provided in an embodiment of the present invention;

[0060] Figure 3 This is a schematic diagram of a batch horizontal well group provided in an embodiment of the present invention;

[0061] Figure 4 This is a schematic diagram of the structure of a magnetic field generator provided in an embodiment of the present invention;

[0062] Figure 5 for Figure 1A schematic diagram showing the arrangement of the magnetic field generator and magnetic field strength detector in the distance measurement method for batch horizontal well groups;

[0063] Figure 6 This is a schematic diagram illustrating the azimuth relationship between the well to be drilled and two groups of completed wells in a batch horizontal well group ranging method provided in an embodiment of the present invention.

[0064] Figure 7 This is a schematic diagram illustrating the spatial position determination method of a magnetic field generator in a batch horizontal well group ranging method provided by an embodiment of the present invention;

[0065] Figure 8 A flowchart illustrating another method for measuring the distance of a batch of horizontal well groups provided in an embodiment of the present invention;

[0066] Figure 9 for Figure 8 The diagram shows the arrangement of the magnetic field generator and magnetic field strength detector in the distance measurement method for batch horizontal well groups. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0068] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0069] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] Example 1

[0071] This invention provides a method for measuring the distance of a batch of horizontal well groups, referring to... Figure 1As shown, the method includes:

[0072] S101: The magnetic field generator is lowered into the horizontal section of the well to be drilled along with the wellbore trajectory control system, and the magnetic field generator is moved along with the wellbore trajectory control system.

[0073] S102: Select two completed wells that meet the following conditions: the distance between the horizontal section of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance, the horizontal sections of the two completed wells are located at different positions around the horizontal section of the well to be drilled, and the angle between the center line of the horizontal section of the well to be drilled and the line connecting the center lines of the two completed wells is greater than or equal to a first preset angle.

[0074] S103: Lower the two sets of magnetic field strength detectors into the corresponding horizontal sections of the completed well;

[0075] S104: Control the vertical plane spacing of the two sets of magnetic field strength detectors to be less than the second preset distance, and make the two sets of magnetic field strength detectors move synchronously in the corresponding completed well horizontal section.

[0076] S105: Transmit the magnetic field strength data of the two sets of magnetic field strength detectors to the data analysis system through the data transmission system;

[0077] S106: Determine the spatial location of the magnetic field generator through the data analysis system.

[0078] In this embodiment of the invention, by selecting two completed wells located at different azimuths around the horizontal section of the well to be drilled, and ensuring that the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle, after the two sets of magnetic field strength detectors are respectively lowered into the corresponding completed well horizontal sections, the two sets of magnetic field strength detectors and the magnetic field generator will not be on the same plane. By measuring the angle between the magnetic field generator and the two sets of magnetic field strength detectors, the basic azimuth data of the magnetic field strength detectors can be determined. By measuring the magnetic field strength detectors, the distance between the magnetic field strength detectors and the magnetic field generator can be determined. Then, by measuring the distance between the two sets of magnetic field strength detectors and the magnetic field generator, and combining the actual spatial azimuth of the two sets of magnetic field strength detectors, the spatial azimuth of the magnetic field generator can be determined. The obtained azimuth data has high accuracy, avoiding the problem of low azimuth measurement accuracy and unreliable azimuth data of a single set of magnetic field strength detectors.

[0079] The ranging system used in the above-described batch horizontal well group ranging method provided in this embodiment of the invention refers to... Figure 2 As shown, the ranging system may include: a magnetic field generator 1, two sets of magnetic field strength detectors 2, a data transmission system 3, a data analysis system 4, and a wellbore trajectory control system 5; wherein:

[0080] The magnetic field generator 1 can be lowered into the well to be drilled along with the wellbore trajectory control system 5, and can move along with the wellbore trajectory control system 5;

[0081] The two sets of magnetic field strength detectors 2 can be lowered into different horizontal sections of the completed wells, and can move along the wellbore trajectory of the horizontal section of the completed well;

[0082] The two sets of magnetic field strength detectors 2 and the data analysis system 4 are connected by a signal through the data transmission system 3;

[0083] The data analysis system 4 is configured to determine the spatial position of the magnetic field generator 1 and its distance from the magnetic field detector 2 based on the magnetic field strength data obtained from the two sets of magnetic field strength detectors 2.

[0084] In one specific embodiment, the wellbore trajectory control system 5 may include a drill bit, a directional tool, an engineering parameter measuring device, and a geological parameter measuring device. The magnetic field generator 1 and the drill bit, directional tool, engineering parameter measuring device, and geological parameter measuring device in the wellbore trajectory control system 5 are connected via drill pipe and downhole tools. The downhole tools used may be drill collars, centralizers, and speed-up tools, etc. The directional tool may be a rotary directional tool or a screw drill string with a bend joint. The engineering parameter measuring device may be an existing mud pulse measurement while drilling tool (such as MWD), an electromagnetic wave measurement while drilling tool (such as EM-MWD), or a gyroscope measurement while drilling instrument (such as gMWD). The geological parameter measuring device is used to measure geological formation characteristic parameters, such as resistivity, porosity, formation density, and water saturation. It may employ conventional tools described in the prior art for measuring these geological formation characteristic parameters; the specific implementation method is not specifically limited here.

[0085] In this embodiment of the invention, the magnetic field generator 1 is disposed at the rear end of the drill bit of the wellbore trajectory control system 5, so that it can move with the drill bit. Of course, in some specific cases, the magnetic field generator 1 can also be disposed at other parts of the wellbore trajectory control system 5, such as at the rear end of the guide drill string.

[0086] In this embodiment of the invention, reference is made to Figure 3As shown, this batch of horizontal well groups includes at least three horizontal wells, and the preset wellbore trajectories of the horizontal segments of each pair of adjacent wells are approximately parallel. The minimum distance L between the horizontal segments of each pair of adjacent wells does not exceed the aforementioned first preset distance, which can be determined based on the measurement range and accuracy of the ranging system, for example, it can be 50m or 30m. The two completed wells can be located at different azimuths around the well to be drilled. In the above embodiment, of the two completed wells in this batch of horizontal well groups, the first completed well can be drilled using conventional drilling guidance technology for wellbore trajectory control, while the second completed well can be drilled using existing magnetic ranging technology for wellbore trajectory control. Specifically, the drilling methods used for these two completed wells can be referred to in detail in existing technologies, and are not specifically limited here. It should be noted that in order to ensure the detection effect of the magnetic ranging system, avoid magnetic interference to the magnetic field strength detector 2, and prevent magnetic signal disturbance, the drilling method described in this embodiment can be an open-hole or screen completion method. In this embodiment of the invention, in order to improve measurement accuracy, the horizontal section of each well in the batch of horizontal well groups can be completed using drill bits of the same size.

[0087] Reference Figure 4 As shown, the magnetic field generator 1 described in this embodiment of the invention can generate a magnetic field 101 of a certain intensity under a certain magnetic field mode. This magnetic field 101 is a magnetic field of a known magnetic field mode (such as a rotating magnetic field) and can be detected by the aforementioned magnetic field strength detector 2. The magnetic field generator 1 can be a natural magnet, a permanent magnet with a certain magnetic field strength, a specific magnetic device formed by arranging a group of magnets or lodestones according to certain rules, or a solenoid magnetic field generator that generates a magnetic field of a certain intensity after being energized. In this embodiment of the invention, the magnetic field strength of the magnetic field generator 1 is an order of magnitude higher than the geomagnetic intensity and the residual magnetic field strength of the drill string, so that it can be better detected by the magnetic field strength detector 2.

[0088] The magnetic field strength detector 2 described in this embodiment of the invention can be an instrument for detecting the strength and direction of the nearby magnetic field distribution, or it can also be called a probe. The magnetic field strength detector 2 can detect the magnetic field strength of the surrounding three axes (X, Y, Z three different directions).

[0089] In one embodiment, refer to Figure 5 As shown, in this embodiment of the invention, the two sets of magnetic field strength detectors 2 are located in the horizontal sections of two completed wells in the use state, and the two sets of magnetic field strength detectors 2 are approximately located in the same vertical plane perpendicular to the horizontal well section, so that the distance between the vertical planes of the two sets of magnetic field strength detectors 2 is less than the second preset distance.

[0090] Reference Figure 6 As shownFigure 5 The schematic diagram of the cross-section in the AA direction shown is derived from... Figure 6 It can be seen that the angle between the centerline of the horizontal section to be drilled and the line connecting the centerlines of the two completed horizontal sections is θ, where θ is greater than or equal to the first preset angle.

[0091] In one specific embodiment, the step S103 described above, which involves lowering the two sets of magnetic field strength detectors 2 into the corresponding completed well horizontal sections, may specifically include:

[0092] The two sets of magnetic field strength detectors 2 are respectively lowered into the corresponding horizontal sections of the completed well using coiled tubing or coupling tubing.

[0093] In this embodiment of the invention, when lowering the two sets of magnetic field strength detectors 2, the lowering positions of the two sets of magnetic field strength detectors 2 can be determined with reference to the lowering position of the magnetic field generator 1. For example, based on the lowering position of the magnetic field generator 1, the lowering positions of the two sets of magnetic field strength detectors 2 can be controlled to be less than or equal to a second preset distance from the position of the magnetic field generator 1. By setting the distance between the lowering positions of the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 to be less than or equal to the second preset distance, it is ensured that both sets of magnetic field strength detectors 2 can effectively receive the magnetic field strength data from the magnetic field generator 1. In this embodiment of the invention, the second preset distance can be set according to the actual drilling requirements and the detection distance and accuracy of the magnetic field strength detectors, for example, it can be 10m or 5m. In this embodiment of the invention, the specific lowering position of the magnetic field strength detectors 2 can be calculated based on the wellbore trajectory parameters of the two completed wells. Based on the lowering position and the position of the surface workover rig, the lowering length of the coiled tubing or coupling tubing is determined, so as to achieve accurate lowering of the two sets of magnetic field strength detectors 2 to the designated lowering positions.

[0094] In this embodiment of the invention, the data transmission system 3 is connected to the magnetic field strength detector 2 and can transmit the magnetic field strength data measured by the magnetic field strength detector 2 back to the data analysis system 4. The data analysis system 4 is located outside the batch of horizontal well groups, above ground level. (Refer to...) Figure 5 As shown, the data transmission system 3 described above can transmit the magnetic field strength data measured by the magnetic field strength detector 2 to the data analysis system 4 via cable. Of course, the data transmission system 3 can also transmit the magnetic field strength data measured by the magnetic field strength detector 2 to the data analysis system 4 in any form, such as electromagnetic wave or column stress wave. The specific implementation process can be found in the relevant descriptions in the prior art, and will not be elaborated upon here.

[0095] In this embodiment of the invention, when the data parsing system 4 receives the magnetic field strength data transmitted by the data transmission system 3, it can parse and calculate the two sets of magnetic field strength data to generate two sets of distance and orientation data between the magnetic field strength detector 2 and the magnetic field generator 1. Based on the distance and orientation data, the spatial position of the magnetic field generator 1 is determined and presented on a certain interface for use and reference in drilling guidance operations.

[0096] In one embodiment, determining the spatial position of the magnetic field generator 1 through the data parsing system 4 as described in step S106 above may specifically include:

[0097] Based on the magnetic field strength obtained from the two sets of magnetic field strength detectors 2, the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 is determined.

[0098] Based on the insertion depth of the two sets of magnetic field strength detectors 2 and the wellbore trajectory data of the corresponding completed well, the spatial position of the two sets of magnetic field strength detectors 2 is determined.

[0099] The spatial position of the magnetic field generator 1 is determined based on the spatial positions of the two sets of magnetic field strength detectors 2 and the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1.

[0100] In one specific embodiment, determining the spatial position of the magnetic field generator 1 based on the spatial positions of the two sets of magnetic field strength detectors 2 and the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 specifically includes:

[0101] Two circles are determined, each with its center as the center and the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 as its radius. The two intersection points of the two circles are obtained.

[0102] Based on the spatial positions of the two sets of magnetic field strength detectors 2, the spatial position of the magnetic field generator 1 is obtained from the two intersection points.

[0103] Reference Figure 7As shown, the data analysis system 4 analyzes and calculates the magnetic field strength in the two selected completed wells to obtain the distances r1 and r2 between the magnetic field generator 1 and the two sets of magnetic field strength detectors 2. Two circles are drawn with the centers of the two sets of magnetic field strength detectors 2 as the centers and the aforementioned distances r1 and r2 as the radii, obtaining the two intersection points of the two circles. Combining the insertion depth of the two sets of magnetic field strength detectors 2 and the wellbore trajectory data of the corresponding completed wells, the actual spatial orientation of the two sets of magnetic field strength detectors 2 is determined, and then one of the intersection points actually corresponding to the magnetic field generator 1 is determined. This intersection point is taken as the spatial position of the magnetic field generator 1. In this embodiment of the invention, the specific process of analyzing and calculating the magnetic field strength data of the two sets of magnetic field strength detectors 2 to obtain the distance between the magnetic field generator 1 and the two sets of magnetic field strength detectors 2 can be referred to in the detailed description of the prior art, and will not be repeated here.

[0104] In the ranging method provided by this embodiment of the invention, during the ranging process, as the drill bit of the wellbore trajectory control system 5 drills, the distance between the magnetic field generator 1 and the magnetic field strength detector 2 increases. When this distance exceeds the accuracy requirements of magnetic ranging, it is necessary to move the two sets of magnetic field strength detectors 2 synchronously. Based on this, the above step S104 controls the vertical plane spacing of the two sets of magnetic field strength detectors 2 to be less than a second preset distance, and makes the two sets of magnetic field strength detectors 2 move synchronously in the corresponding completed well horizontal section. Specifically, this may include:

[0105] Determine whether the distance between the magnetic field generator 1 and any magnetic field strength detector 2 exceeds the preset measurement distance;

[0106] If so, the two sets of magnetic field strength detectors 2 are controlled to move synchronously in the corresponding completed drilling horizontal section and approach the spatial position of the magnetic field generator 1, and the vertical distance between the two sets of magnetic field strength detectors 2 is controlled to be less than the second preset distance.

[0107] In one embodiment, the above-described ranging method further includes:

[0108] Based on the determined spatial positions of the magnetic field generator 1 at multiple different times, the actual wellbore trajectory of the horizontal section to be drilled is determined.

[0109] In this embodiment of the invention, the actual wellbore trajectory of the horizontal section to be drilled is determined by the multiple spatial position data of the obtained magnetic field generator 1, and the direction of the wellbore trajectory is obtained. Then, the subsequent drilling guidance operation is guided according to the direction of the wellbore trajectory, so as to realize the direction control of the wellbore trajectory and avoid the collision or deviation of the wellbore trajectory.

[0110] The ranging method for batch horizontal well groups provided in this invention involves lowering two sets of magnetic field strength detectors 2 into two different completed wells. Since the distance between the selected horizontal sections of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance, and the horizontal sections of the two completed wells are located at different azimuths around the horizontal section of the well to be drilled, and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle, it is possible to use two sets of magnetic field strength detectors 2 to locate the wellbore trajectory of the well to be drilled. Based on the magnetic field strength of the two sets of magnetic field strength detectors 2, the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 is determined, thereby determining the accurate position of the magnetic field generator 1. This method can overcome the problem of insufficient azimuth measurement accuracy of conventional magnetic guidance tools. The actual wellbore trajectory of the well to be drilled determined by this ranging system has a higher tolerance, which is beneficial to improving the control accuracy of the wellbore trajectory and facilitating the direction control of the wellbore trajectory in subsequent drilling guidance operations, preventing the wellbore trajectory of the well to be drilled from deviating from the preset wellbore trajectory.

[0111] Example 2

[0112] Based on the same inventive concept, embodiments of the present invention also provide another method for ranging batch horizontal well groups, referring to... Figure 8 As shown, it includes:

[0113] S201: The magnetic field generator is lowered into the horizontal section of the well to be drilled along with the wellbore trajectory control system, and the magnetic field generator is moved along with the wellbore trajectory control system.

[0114] S202: Select two completed wells that meet the following conditions: the distance between the horizontal section of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance, the horizontal sections of the two completed wells are located at different positions around the horizontal section of the well to be drilled, and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle.

[0115] S203: Lower the two sets of magnetic field strength detectors into the corresponding horizontal sections of the completed well;

[0116] S204: Control the two sets of magnetic field strength detectors to be respectively set on the front and rear sides of the magnetic field generator, the vertical distance between the two sets of magnetic field strength detectors is greater than the third preset distance, and make the two sets of magnetic field strength detectors move alternately in the corresponding completed well horizontal section.

[0117] S205: Transmit the magnetic field strength data of the two sets of magnetic field strength detectors to the data analysis system through the data transmission system;

[0118] S206: Determine the spatial location of the magnetic field generator through the data analysis system.

[0119] In this embodiment of the invention, two completed wells located at different azimuths around the horizontal section of the well to be drilled are selected, and the angle between the centerline of the horizontal section to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle. Therefore, after two sets of magnetic field strength detectors are respectively lowered into the corresponding completed well sections, the distance between the magnetic field strength detectors and the magnetic field generator is determined by the measurements of the two sets of magnetic field strength detectors. Then, by combining the distance between the two sets of magnetic field strength detectors and the magnetic field generator with the actual spatial azimuth of the two sets of magnetic field strength detectors, the spatial azimuth of the magnetic field generator is determined. The obtained azimuth data has high accuracy, avoiding the problem of low azimuth measurement accuracy and unreliable azimuth data from a single set of magnetic field strength detectors. Simultaneously, since a single set of magnetic field strength detectors has a short movement range, frequent movement can affect drilling efficiency. Compared to using a single magnetic field strength detector for distance measurement, the alternating movement of two sets of magnetic field strength detectors speeds up the movement of the detection equipment, reduces the movement frequency of each set of magnetic field strength detectors, and improves the efficiency of drilling guidance operations.

[0120] The specific implementation of the ranging system used in the ranging method for the batch horizontal well groups provided in this embodiment of the invention can be referred to the section on ranging in Embodiment 1 above. Figure 2 The specific implementation and usage of the magnetic field generator 1, two sets of magnetic field strength detectors 2, data transmission system 3, data analysis system 4, and wellbore trajectory control system 5 can be referred to the detailed description in the above embodiment 1, and will not be repeated here.

[0121] In this embodiment of the invention, when lowering the two sets of magnetic field strength detectors 2, the lowering positions of the two sets of magnetic field strength detectors 2 can be determined with reference to the lowering position of the magnetic field generator 1. For example, based on the lowering position of the magnetic field generator 1, the lowering positions of the two sets of magnetic field strength detectors 2 can be controlled to be located on the front and rear sides of the magnetic field generator 1, respectively, and the vertical distance between the two sets of magnetic field strength detectors 2 is greater than a third preset distance. Unlike the method used in Embodiment 1 above, where the vertical distance between the two sets of magnetic field strength detectors 2 is less than a second preset distance, in this embodiment of the invention, the two sets of magnetic field strength detectors 2 are not located in the same vertical plane in the horizontal well section. The vertical planes of the horizontal well section where the two sets of magnetic field strength detectors 2 are located are located on the front and rear sides of the vertical plane of the horizontal well section where the magnetic field generator 1 is located, respectively, with reference to... Figure 9As shown, one set of magnetic field strength detectors 2 is located near the front end of the wellbore of the magnetic field generator 1 (referred to as the front-end magnetic field strength detectors 2), while another set of magnetic field strength detectors 2 is located near the rear end of the wellbore of the magnetic field generator 1 (referred to as the rear-end magnetic field strength detectors 2). By setting the lowering positions of the two sets of magnetic field strength detectors 2 on the front and rear sides of the magnetic field generator 1 respectively, and ensuring that the vertical distance between the two sets of magnetic field strength detectors 2 is greater than a third preset distance, magnetic field strength data from at least one set of magnetic field strength detectors 2 that is relatively close to the magnetic field generator 1 can always be obtained during the drilling process. In this embodiment of the invention, the size of the third preset distance can be determined according to the actual drilling requirements, for example, it can be 15m or 20m.

[0122] In one embodiment of the present invention, the data analysis system can determine the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 based on the received magnetic field strength data from the two sets of magnetic field strength detectors 2. At this point, the method for obtaining the spatial position of the magnetic field generator 1 can be determined based on the difference between the two distances. Specifically, the step S206 described above, which involves determining the spatial position of the magnetic field generator 1 through the data parsing system 4, may include:

[0123] Assuming that the distances between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 differ significantly at the current moment, the magnetic field strength data from the magnetic field strength detector 2, which is closer to the magnetic field generator 1, is taken as the most reliable data for analysis and calculation. The magnetic field strength data from the other set of magnetic field strength detectors 2, which is farther from the magnetic field generator 1, is used as auxiliary data for analysis and calculation. Specifically, the spatial position of the magnetic field generator 1 can be determined by using the two sets of magnetic field strength detectors 2 respectively, and the spatial position of the magnetic field generator 1 determined by the farther magnetic field strength detector 2 can be used to help determine the accuracy of the spatial position of the magnetic field generator 1 determined by the farther magnetic field strength detector 2.

[0124] Assuming that the distance difference between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 is small at the current moment, for example, the magnetic field generator 1 is located in the middle of the two sets of magnetic field strength detectors 2, then both sets of magnetic field strength detectors 2 are relatively close to the magnetic field generator 1. Therefore, the magnetic field strength data of both sets of magnetic field strength detectors 2 can be used as reliable analysis and calculation data. The spatial position of the magnetic field generator 1 can be determined by using the method in Embodiment 1. The specific implementation method can be referred to the detailed description of step S106 in Embodiment 1 above.

[0125] The ranging method provided in this embodiment of the invention, during the ranging process, as the drill bit of the wellbore trajectory control system 5 drills, the distance between the magnetic field generator 1 and the magnetic field strength detector 2 increases, exceeding the accuracy requirements of magnetic ranging. Assuming that both sets of magnetic field strength detectors 2 are now located near the rear end of the wellbore of the magnetic field generator 1, the magnetic field strength detector 2 that is farther away is moved forward a preset distance, so that the moved magnetic field strength detectors 2 are all located near the front end of the wellbore of the magnetic field generator 1, while the unmoved magnetic field strength detectors 2 are located near the rear end of the wellbore of the magnetic field generator 1. This ensures that the vertical planes of the horizontal well section where the two sets of magnetic field strength detectors 2 are located are again located on the front and rear sides of the vertical plane of the horizontal well section where the magnetic field generator 1 is located. Based on this, step S204 controls the two sets of magnetic field strength detectors 2 to be respectively positioned on the front and rear sides of the magnetic field generator 1, the distance between the vertical planes of the two sets of magnetic field strength detectors 2 is greater than a third preset distance, and the two sets of magnetic field strength detectors 2 move alternately in the corresponding completed horizontal well section. Specifically, this may include:

[0126] Determine whether the distance between the magnetic field generator 1 and the magnetic field strength detector 2, which is located at a greater distance, exceeds the preset measurement distance;

[0127] If so, the magnetic field strength detector 2, which is farther away, is controlled to move in the corresponding completed horizontal section of the well, and after the movement, the vertical planes of the two sets of magnetic field strength detectors 2 in the horizontal well section are again located on the front and rear sides of the vertical plane of the horizontal well section where the magnetic field generator 1 is located.

[0128] In one embodiment, the above-described ranging method further includes:

[0129] Based on the determined spatial positions of the magnetic field generator 1 at multiple different times, the actual wellbore trajectory of the horizontal section to be drilled is determined.

[0130] In this embodiment of the invention, the actual wellbore trajectory of the horizontal section to be drilled is determined by the multiple spatial position data of the obtained magnetic field generator 1, and the direction of the wellbore trajectory is obtained. Then, the subsequent drilling guidance operation is guided according to the direction of the wellbore trajectory, so as to realize the direction control of the wellbore trajectory and avoid the collision or deviation of the wellbore trajectory.

[0131] The ranging method for batch horizontal well groups provided by this invention involves lowering two sets of magnetic field strength detectors 2 into two different completed wells. Since the distance between the selected horizontal sections of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance, and the horizontal sections of the two completed wells are located at different azimuths around the horizontal section of the well to be drilled, and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle, it is possible to use two sets of magnetic field strength detectors 2 to locate the wellbore trajectory of the well to be drilled. Based on the magnetic field strength of the two sets of magnetic field strength detectors 2, the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 is determined, thereby determining the accurate position of the magnetic field generator 1. This method can overcome the problem of insufficient spatial orientation measurement accuracy of conventional magnetic guidance tools. The actual wellbore trajectory of the well to be drilled determined by this ranging system has a higher tolerance, which is beneficial to improving the control accuracy of the wellbore trajectory and facilitating the direction control of the wellbore trajectory in subsequent drilling guidance operations, preventing the wellbore trajectory of the well to be drilled from deviating from the preset wellbore trajectory.

[0132] Example 3

[0133] Based on the same inventive concept, embodiments of the present invention also provide a ranging system applied to batch horizontal well groups, referring to... Figure 2 As shown, the ranging system includes: a magnetic field generator 1, two sets of magnetic field strength detectors 2, a data transmission system 3, a data analysis system 4, and a wellbore trajectory control system 5;

[0134] The magnetic field generator 1 can be lowered into the well to be drilled along with the wellbore trajectory control system 5, and can move along with the wellbore trajectory control system 5;

[0135] The two sets of magnetic field strength detectors 2 can be lowered into different horizontal sections of the completed wells, and can move along the wellbore trajectory of the horizontal section of the completed well;

[0136] The two sets of magnetic field strength detectors 2 and the data analysis system 4 are connected by a signal through the data transmission system 3;

[0137] In use, the two sets of magnetic field strength detectors 2 are respectively lowered into the horizontal sections of two completed wells that meet the following conditions: the distance between the two completed well horizontal sections and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the two completed well horizontal sections are respectively located at different positions around the well of the horizontal section to be drilled; and the angle between the center line of the horizontal section to be drilled and the line connecting the center lines of the two completed well horizontal sections is greater than or equal to a first preset angle.

[0138] The two sets of magnetic field strength detectors 2 are configured such that the distance between them in the vertical plane is less than a second preset distance, and they can move synchronously within the corresponding completed drilling horizontal section;

[0139] The data analysis system 4 is configured to determine the spatial location of the magnetic field generator 1 based on the magnetic field strength data acquired from the two sets of magnetic field strength detectors 2.

[0140] In one embodiment, the data analysis system 4 is specifically configured to determine the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1 based on the acquired magnetic field strength of the two sets of magnetic field strength detectors 2.

[0141] Based on the insertion depth of the two sets of magnetic field strength detectors 2 and the wellbore trajectory data of the corresponding completed well, the spatial position of the two sets of magnetic field strength detectors 2 is determined.

[0142] The spatial position of the magnetic field generator 1 is determined based on the spatial positions of the two sets of magnetic field strength detectors 2 and the distance between the two sets of magnetic field strength detectors 2 and the magnetic field generator 1.

[0143] In one embodiment, the data analysis system 4 is further configured to determine the actual wellbore trajectory of the well to be completed based on the spatial location of the magnetic field generator 1 at multiple different times.

[0144] In one embodiment, the magnetic field strength detector 2 is lowered into the horizontal section of the completed well with the assistance of coiled tubing or coupling tubing.

[0145] In one embodiment, the wellbore trajectory control system 5 includes a drill bit, and the magnetic field generator 1 is disposed at the rear end of the drill bit.

[0146] In one embodiment, the wellbore trajectory control system 5 further includes a guiding tool, an engineering parameter measuring device, and a geological parameter measuring device.

[0147] The specific implementation of the ranging system for batch horizontal well groups provided in this embodiment of the invention can be referred to the detailed description of the ranging method for batch horizontal well groups in Embodiment 1. Repeated descriptions will not be repeated here. The specific structures of the magnetic field generator 1, the two sets of magnetic field strength detectors 2, the data transmission system 3, and the wellbore trajectory control system 5 can be referred to the relevant descriptions in the prior art. Therefore, this embodiment of the invention does not impose specific limitations on these aspects.

[0148] Example 4

[0149] Based on the same inventive concept, embodiments of the present invention also provide a ranging system applied to batch horizontal well groups, referring to... Figure 2 As shown, the ranging system includes: a magnetic field generator 1, two sets of magnetic field strength detectors 2, a data transmission system 3, a data analysis system 4, and a wellbore trajectory control system 5;

[0150] The magnetic field generator 1 can be lowered into the well to be drilled along with the wellbore trajectory control system 5, and can move along with the wellbore trajectory control system 5;

[0151] The magnetic field strength detector 2 is lowered into the horizontal section of the completed well and can move along the wellbore trajectory of the horizontal section of the completed well;

[0152] The two sets of magnetic field strength detectors 2 and the data analysis system 4 are connected by a signal through the data transmission system 3;

[0153] In use, the two sets of magnetic field strength detectors 2 are respectively lowered into the horizontal sections of two completed wells that meet the following conditions: the distance between the two completed well horizontal sections and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the two completed well horizontal sections are respectively located at different positions around the well of the horizontal section to be drilled; and the angle between the center line of the horizontal section to be drilled and the line connecting the center lines of the two completed well horizontal sections is greater than or equal to a first preset angle.

[0154] The two sets of magnetic field strength detectors 2 are configured such that the distance between them in the vertical plane is less than a second preset distance, and they can move synchronously within the corresponding completed drilling horizontal section;

[0155] The two sets of magnetic field strength detectors 2 are configured with a distance greater than a third preset distance in the vertical plane and are respectively set on the front and rear sides of the magnetic field generator 1, and can move alternately within the corresponding completed drilling horizontal section;

[0156] The data analysis system 4 is configured to determine the spatial position of the magnetic field generator 1 based on the magnetic field strength of the two sets of magnetic field strength detectors 2.

[0157] The specific implementation of the ranging system for batch horizontal well groups provided in this embodiment of the invention can be referred to the detailed description of the ranging method for batch horizontal well groups in Embodiments 1 and 2. Where repetition is found, it will not be repeated here. The specific structures of the magnetic field generator 1, the two sets of magnetic field strength detectors 2, the data transmission system 3, and the wellbore trajectory control system 5 can be referred to the relevant descriptions in the prior art. Therefore, this embodiment of the invention does not impose specific limitations on these aspects.

[0158] Example 5

[0159] Based on the same inventive concept, embodiments of the present invention also provide a drilling operation system, including the ranging system for batch horizontal well groups provided in Embodiment 3 or Embodiment 4 above.

[0160] The specific implementation of the drilling operation system provided in this embodiment of the invention can be referred to the detailed description in Embodiment 3 or Embodiment 4. Repeated descriptions will not be repeated here. The specific structures of the magnetic field generator 1, the two sets of magnetic field strength detectors 2, the data transmission system 3, and the wellbore trajectory control system 5 can be referred to the relevant descriptions in the prior art. Therefore, this embodiment of the invention does not impose specific limitations on these aspects.

[0161] Example 6

[0162] Based on the same inventive concept, this embodiment of the invention also provides a method for determining the spatial position of a magnetic field generator 1, using the ranging system for batch horizontal well groups provided in Embodiment 3 or Embodiment 4 above.

[0163] The specific implementation of the spatial position determination method of the magnetic field generator 1 provided in this embodiment of the invention can be referred to the detailed description in Embodiment 3 or Embodiment 4. Repeated descriptions will not be repeated here. The specific structures of the magnetic field generator 1, the two sets of magnetic field strength detectors 2, the data transmission system 3, and the wellbore trajectory control system 5 can be referred to the relevant descriptions in the prior art. Therefore, this embodiment of the invention does not impose specific limitations on these aspects.

[0164] Example 7

[0165] Based on the same inventive concept, this invention also provides an application of the ranging system for batch horizontal well groups provided in Embodiment 3 or Embodiment 4 in drilling operations.

[0166] The specific implementation of the embodiments of the present invention can be referred to the detailed description in Embodiments 1 to 4. Repeated descriptions will not be repeated here. The specific structures of the magnetic field generator 1, the two sets of magnetic field strength detectors 2, the data transmission system 3, and the wellbore trajectory control system 5 can be referred to the relevant descriptions in the prior art. Therefore, the embodiments of the present invention do not impose specific limitations on these aspects.

[0167] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. The terms "upper," "lower," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0168] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. This invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or substitution of these aspects and / or embodiments. Each aspect and / or embodiment of this invention can be used alone, or in combination with one or more other aspects and / or other embodiments.

[0169] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for measuring the distance of a batch of horizontal well groups, characterized in that, include: The magnetic field generator is lowered into the horizontal section of the well to be drilled along with the wellbore trajectory control system, and the magnetic field generator is moved along with the wellbore trajectory control system. Select two completed wells that meet the following conditions: the distance between the horizontal section of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the horizontal sections of the two completed wells are located at different positions around the horizontal section of the well to be drilled; and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle. Two sets of magnetic field strength detectors were respectively lowered into the corresponding horizontal sections of the completed well. The vertical distance between the two sets of magnetic field strength detectors is controlled to be less than a second preset distance, and the two sets of magnetic field strength detectors move synchronously in the corresponding completed well horizontal section. The magnetic field strength data from the two sets of magnetic field strength detectors are transmitted to the data analysis system via a data transmission system. The spatial location of the magnetic field generator is determined by the data analysis system.

2. The ranging method according to claim 1, characterized in that, Determining the spatial location of the magnetic field generator through the data analysis system includes: Based on the magnetic field strength obtained from the two sets of magnetic field strength detectors, the distance between the two sets of magnetic field strength detectors and the magnetic field generator is determined; Based on the insertion depth of the two sets of magnetic field strength detectors and the wellbore trajectory data of the corresponding completed wells, the spatial positions of the two sets of magnetic field strength detectors are determined. The spatial position of the magnetic field generator is determined based on the spatial positions of the two sets of magnetic field strength detectors and the distance between the two sets of magnetic field strength detectors and the magnetic field generator.

3. The ranging method according to claim 2, characterized in that, Determining the spatial position of the magnetic field generator based on the spatial positions of the two sets of magnetic field strength detectors and the distance between the two sets of magnetic field strength detectors and the magnetic field generator includes: Two circles are determined, each with its center as the center and the distance between the two sets of magnetic field strength detectors and the magnetic field generator as its radius. The two intersection points of the two circles are obtained. Based on the spatial positions of the two sets of magnetic field strength detectors, the spatial position of the magnetic field generator is obtained from the two intersection points.

4. The ranging method according to claim 2, characterized in that, Also includes: Based on the determined spatial positions of the magnetic field generator at multiple different times, the actual wellbore trajectory of the horizontal section to be drilled is determined.

5. The ranging method according to claim 1, characterized in that, The step of lowering two sets of magnetic field strength detectors into the corresponding horizontal sections of the completed well includes: The two sets of magnetic field strength detectors are lowered into the corresponding horizontal sections of the completed well using coiled tubing or coupling tubing.

6. The ranging method according to claim 4, characterized in that, Also includes: The positions of the two sets of magnetic field strength detectors and the position of the magnetic field generator are both controlled to be less than or equal to a second preset distance.

7. A method for measuring the distance of a batch of horizontal well groups, characterized in that, include: The magnetic field generator is lowered into the horizontal section of the well to be drilled along with the wellbore trajectory control system, and the magnetic field generator is moved along with the wellbore trajectory control system. Select two completed wells that meet the following conditions: the distance between the horizontal section of the two completed wells and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the horizontal sections of the two completed wells are located at different positions around the horizontal section of the well to be drilled; and the angle between the centerline of the horizontal section of the well to be drilled and the line connecting the centerlines of the two completed wells is greater than or equal to a first preset angle. Two sets of magnetic field strength detectors were respectively lowered into the corresponding horizontal sections of the completed well. The two sets of magnetic field strength detectors are respectively set on the front and rear sides of the magnetic field generator, the vertical distance between the two sets of magnetic field strength detectors is greater than a third preset distance, and the two sets of magnetic field strength detectors move alternately in the corresponding completed well horizontal section. The magnetic field strength data from the two sets of magnetic field strength detectors are transmitted to the data analysis system via a data transmission system. The spatial location of the magnetic field generator is determined by the data analysis system.

8. A ranging system for use in batches of horizontal well groups, characterized in that, The ranging system includes: a magnetic field generator, two sets of magnetic field strength detectors, a data transmission system, a data analysis system, and a wellbore trajectory control system; The magnetic field generator can be lowered into the well to be drilled along with the wellbore trajectory control system, and can also move along with the wellbore trajectory control system. The two sets of magnetic field strength detectors can be lowered into different horizontal sections of the completed wells and can move along the wellbore trajectory of the horizontal section of the completed well. The two sets of magnetic field strength detectors and the data analysis system are connected by a signal through the data transmission system; In use, the two sets of magnetic field strength detectors are respectively lowered into the horizontal sections of two completed wells that meet the following conditions: the distance between the two completed well horizontal sections and the horizontal section of the well to be drilled is less than or equal to a first preset distance; the two completed well horizontal sections are respectively located at different positions around the well of the horizontal section to be drilled; and the angle between the center line of the horizontal section to be drilled and the line connecting the center lines of the two completed well horizontal sections is greater than or equal to a first preset angle. The two sets of magnetic field strength detectors are configured to be spaced less than a second preset distance in the vertical plane and to move synchronously within the corresponding completed horizontal section of the well. The data analysis system is configured to determine the spatial location of the magnetic field generator based on the magnetic field strength data acquired from the two sets of magnetic field strength detectors.

9. The ranging system according to claim 8, characterized in that, The data analysis system is specifically configured to determine the distance between the two sets of magnetic field strength detectors and the magnetic field generator based on the magnetic field strength obtained from the two sets of magnetic field strength detectors. Based on the insertion depth of the two sets of magnetic field strength detectors and the wellbore trajectory data of the corresponding completed wells, the spatial positions of the two sets of magnetic field strength detectors are determined. The spatial position of the magnetic field generator is determined based on the spatial positions of the two sets of magnetic field strength detectors and the distance between the two sets of magnetic field strength detectors and the magnetic field generator.

10. The ranging system according to claim 9, characterized in that, The data analysis system is also configured to determine the actual wellbore trajectory of the well to be drilled based on the spatial position of the magnetic field generator at multiple different times.

11. The ranging system according to claim 8, characterized in that, The magnetic field strength detector is lowered into the horizontal section of the completed well with the assistance of a continuous tubing or a coupling tubing.

12. The ranging system according to claim 8, characterized in that, The wellbore trajectory control system includes a drill bit, and the magnetic field generator is located at the rear end of the drill bit.

13. The ranging system according to claim 8, characterized in that, The wellbore trajectory control system also includes a guiding tool, an engineering parameter measuring device, and a geological parameter measuring device.

14. A ranging system applied to batch horizontal well groups, characterized in that, The ranging system includes: a magnetic field generator, two sets of magnetic field strength detectors, a data transmission system, a data analysis system, and a wellbore trajectory control system; The magnetic field generator can be lowered into the well to be drilled along with the wellbore trajectory control system, and can also move along with the wellbore trajectory control system. The magnetic field strength detector is lowered into the horizontal section of the completed well and can move along the wellbore trajectory of the horizontal section of the completed well. The two sets of magnetic field strength detectors and the data analysis system are connected by a signal through the data transmission system; In use, the two sets of magnetic field strength detectors are respectively lowered into the horizontal sections of two completed wells that meet the following conditions: the distance between the two completed well horizontal sections and the horizontal section to be drilled is less than or equal to a first preset distance; the two completed well horizontal sections are respectively located at different positions around the horizontal section to be drilled; and the angle between the centerline of the horizontal section to be drilled and the line connecting the centerlines of the two completed well horizontal sections is greater than or equal to a first preset angle. The two sets of magnetic field strength detectors are configured to be spaced less than a second preset distance in the vertical plane and to move synchronously within the corresponding completed horizontal section of the well. The two sets of magnetic field strength detectors are configured with a vertical plane spacing greater than a third preset distance and are respectively set on the front and rear sides of the magnetic field generator, and can move alternately within the corresponding completed drilling horizontal section; The data analysis system is configured to determine the spatial location of the magnetic field generator based on the magnetic field strength of the two sets of magnetic field strength detectors.

15. A drilling operation system, characterized in that, The system includes the ranging system for use in batches of horizontal well groups as described in any one of claims 8-14.

16. A method for determining the spatial position of a magnetic field generator, characterized in that, Use the ranging system for batch horizontal well groups as described in any one of claims 8-14.

17. The application of the ranging system according to any one of claims 8-14 in drilling operations.

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