Magnetic suspension type logging pup joint

Abstract

The invention discloses a magnetic suspension type logging short section, and belongs to the technical field of oil and gas exploration and development equipment. Comprising an execution module used for generating a magnetic field capable of suspending a logging short section; the logging module is used for collecting, receiving, transmitting and storing logging data and controlling a magnetic field; and the power management module is used for supplying power to the parts and used as an actuator to control the magnetic field. According to the invention, the logging pup joint can be prevented from being in contact with the drill rod, the influence of vibration on the logging pup joint is greatly relieved, and the service life of the logging pup joint is prolonged. The dynamic position adjustment of the logging short section in the drill rod can be completed, the logging short section and the drill rod are kept static relatively, and the logging short section can be kept stable in logging operation.

Description

Technical Field

[0001] The invention relates to a magnetic suspension well logging nipple, belonging to the technical field of oil and gas exploration and development equipment. Background Art

[0002] As an essential tool for oil exploration and development, the logging sub is used for logging operations during drilling or tripping. It can achieve logging while drilling to obtain real-time or near-real-time data downhole, helping staff to reconstruct the formation geological model, so as to better understand the formation oil content.

[0003] The application of multiple sensors in logging subs enables real-time measurement of formation data while drilling, improves logging efficiency, and provides valuable data support for the development of complex well conditions and special formations. However, during the installation of current logging subs, it is inevitable that the subs will come into contact with the drill pipe, which will cause vibration and impact during drilling operations to affect the acquisition performance of sensors in the logging subs, bringing risks to actual logging. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetically suspended logging sub to solve the problem in the prior art that vibration and impact affect the logging performance of the logging sub.

[0005] The technical solution of the present invention is a magnetic suspension logging sub, comprising:

[0006] An execution module, used for generating a magnetic field capable of suspending the logging sub;

[0007] Well logging module, used for the collection, reception, transmission, storage of well logging data and control of magnetic field;

[0008] The power management module is used to supply power to the above parts and control the magnetic field as an actuator.

[0009] In the aforementioned magnetically suspended logging pup joint, the execution module includes a drill pipe electromagnet and a pup joint electromagnet. The pup joint electromagnet is disposed on the outer wall of the logging pup joint, and the drill pipe electromagnet is disposed on the inner wall of the drill pipe.

[0010] In the aforementioned magnetically suspended logging sub, the execution module further comprises a drill pipe electromagnet disposed between the inner walls of the drill pipe below the logging sub, and a sub electromagnet disposed at the bottom of the logging sub.

[0011] In the aforementioned magnetically suspended logging pup joint, the execution module also includes a drill pipe magnetic shielding layer and a pup joint magnetic shielding layer, wherein the drill pipe magnetic shielding layer is arranged between the drill pipe electromagnet and the drill pipe, and the pup joint magnetic shielding layer is arranged between the pup joint electromagnet and the logging pup joint.

[0012] In the aforementioned magnetically suspended logging sub, the logging module includes a main control unit, a storage unit and a sensor unit. The sensor unit is used to collect logging data, the main control unit is used to receive and transmit logging data and control the magnetic field, and the storage unit is used to store logging data.

[0013] In the aforementioned magnetically suspended logging sub, the sensor unit comprises a Hall sensor, which is placed at the center of the coil of the sub electromagnet and is used to measure the relative displacement between the sub and the drill pipe.

[0014] In the aforementioned magnetically suspended logging sub, the main control unit determines the position change of the logging sub based on the relative displacement data collected by the Hall sensor, and the corresponding control power management module adjusts the supply current of the electromagnet in a certain area to achieve real-time position adjustment of the logging sub.

[0015] In the aforementioned magnetically suspended logging sub, the output current of the power management module drives the drill pipe electromagnet and the sub electromagnet to generate a magnetic field, so that the logging sub can be suspended in the drill pipe.

[0016] In the aforementioned magnetically suspended logging sub, the power management module and the logging module together constitute the logging sub, and the power management module is disposed in the upper half of the logging sub.

[0017] Beneficial effects of the invention: Compared with the prior art, the invention has the following advantages:

[0018] 1. It can prevent the logging sub from contacting the drill pipe, greatly alleviate the impact of vibration on the logging sub, and increase the service life of the logging sub.

[0019] 2. The dynamic position adjustment of the logging sub inside the drill pipe can be completed, and the logging sub and the drill pipe can be kept relatively still, so that the logging sub can be stably used for logging operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the functional modules of the magnetically suspended logging sub of the present invention;

[0021] Figure 2 It is a front cross-sectional schematic diagram of the magnetic suspension logging sub of the present invention;

[0022] Figure 3 It is a top view cross-sectional schematic diagram of the magnetic suspension logging sub of the present invention;

[0023] Figure 4 It is a front view cross-sectional schematic diagram of the magnetic suspension logging sub of the present invention when it is in a curved section;

[0024] Figure 5It is a schematic cross-sectional view of the front view of the magnetic suspension logging sub of the present invention when it is in a horizontal section;

[0025] Figure 6 It is a schematic diagram of force analysis when the magnetic suspension logging sub of the present invention is in a vertical section;

[0026] Figure 7 It is a schematic diagram of force analysis when the magnetic suspension logging sub of the present invention is in a curved section;

[0027] Figure 8 It is a schematic diagram of force analysis when the magnetic suspension logging sub of the present invention is in a horizontal section.

[0028] Figure numerals: 1-drill pipe, 2-drill pipe magnetic shielding layer, 3-drill pipe electromagnet, 4-short section electromagnet, 5-short section magnetic shielding layer, 6-well logging short section. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0030] Figure 1 A schematic diagram of the composition of a magnetically suspended well logging sub provided in an embodiment of the present invention. An embodiment of the present invention provides a magnetically suspended well logging sub, comprising:

[0031] An execution module, used for generating a magnetic field capable of suspending the logging sub;

[0032] Well logging module, used for the collection, reception, transmission, storage of well logging data and control of magnetic field;

[0033] The power management module is used to supply power to the above parts and control the magnetic field as an actuator.

[0034] The execution module includes a drill pipe electromagnet 3 and a short section electromagnet 4, the logging module includes a main control unit, a sensor unit and a storage unit, the power management module supplies power to the execution module and the logging module, and the power management module and the logging module together constitute a logging short section.

[0035] For example, Figure 2 and Figure 3 The front view and top view of a magnetically suspended logging sub and its installation method provided by an embodiment of the present invention are schematic diagrams. The logging sub 6 is suspended inside the drill pipe 1 by magnetic suspension technology, and the magnetic suspension technology interacts between the drill pipe electromagnet 3 and the sub electromagnet 4.

[0036] The execution module also includes a drill pipe magnetic shielding layer 2 and a short section magnetic shielding layer 5, wherein the drill pipe magnetic shielding layer 2 is arranged between the drill pipe electromagnet 3 and the drill pipe 1, and the short section magnetic shielding layer 5 is arranged between the short section electromagnet 4 and the logging short section 6. The drill pipe magnetic shielding layer 2 and the short section magnetic shielding layer 5 are used to prevent the execution module from generating magnetic interference to other parts of the drill pipe 1 and the logging short section 6.

[0037] Among them, the execution module also includes a drill pipe electromagnet 3 arranged between the inner walls of the drill pipe 1 below the logging pup joint 6, and a pup joint electromagnet 4 arranged at the bottom of the logging pup joint 6. In addition to being used to produce a magnetic field, the drill pipe electromagnet 3 and the pup joint electromagnet 4 arranged at this position can also be used to prevent the logging pup joint 6 from accidentally falling.

[0038] In an embodiment of the present invention, Figure 2 , 4 5 is a schematic diagram of a front view cross-section of a magnetically suspended logging sub and its installation method provided by an example of the present invention, showing the position of the logging sub at various stages during the logging while drilling process. The relative positions of the drill pipe 1 and the logging sub 6 to the ground are different during different logging while drilling processes. Therefore, it is necessary to continuously adjust the magnetic field of the logging sub 6 according to the movement trajectory of the drill pipe 1.

[0039] In the embodiment of the present invention, the sensor unit of the logging module in the logging sub 6 includes a gyroscope, which can know the position of the drill pipe 1 during the logging process. The main control unit sends different current output commands to the power management module according to the position of the drill pipe 1, thereby adjusting the magnetic field strength of each part of the drill pipe electromagnet 3 and the sub electromagnet 4 in the execution module, and completing the real-time position adjustment of the logging sub 6 during the logging process.

[0040] Furthermore, the sensor unit of the logging module in the logging sub 6 also includes a Hall sensor for obtaining the relative displacement between the logging sub 6 and the drill pipe 1. The main control unit determines that the logging sub 6 is in a certain movement trend inside the drill pipe according to the relative displacement data transmitted by the Hall sensor, and the main control unit needs to send a command to the power management module to adjust the power supply current of a certain part of the electromagnet, so that the logging sub 6 is in a stationary state relative to the drill pipe 1 by adjusting the magnetic field of the electromagnet, and the real-time dynamic position adjustment of the logging sub 6 during the logging process is completed, so that the logging sub 6 can better follow the drill pipe 1 to perform logging operations.

[0041] For example, Figure 6A schematic diagram of force analysis of the magnetically suspended logging sub provided by an embodiment of the present invention when it is in a vertical section. During vertical drilling, the logging sub 6 has a downward force G under the action of gravity, and the drill pipe electromagnet 3 below the logging sub 6 is required to generate an upward electromagnetic force P=G on the logging sub 6 to keep the logging sub 6 in a vertical force balance. In order to achieve force balance in the horizontal direction for the logging sub 6, the drill pipe electromagnets 3 on both sides of the logging sub 6 generate a left and right electromagnetic force P1 and P2 on the logging sub, respectively, and P1=P2.

[0042] Figure 7 A schematic diagram of force analysis of a magnetically suspended logging sub in a bending section provided by an embodiment of the present invention. Assuming that the deflection angle between the drill pipe 1 and the formation is α, in order to achieve force balance, the relationship between the electromagnetic force and the gravity is: P1sinα+Pcosα=P2sinα, P1cosα+G=Psinα+P2cosα.

[0043] Figure 8 A schematic diagram of force analysis of a magnetically suspended logging sub provided by an embodiment of the present invention when the sub is in a horizontal section. In order to achieve force balance, the relationship between electromagnetic force and gravity is: P1+G=P2, P=0.

[0044] The electromagnetic force between two electromagnets When other conditions are fixed, in order to achieve the above-mentioned force balance, the main control unit needs to control the power supply current of each part of the drill pipe electromagnet 3 and the short section electromagnet 4 to make them reach a force balance state. In addition, when the Hall sensor detects that the logging short section 6 has a position offset, the main control unit is also required to adjust the power supply current of each part accordingly. During the entire logging operation, the main control unit dynamically adjusts the power supply circuit of each part of the electromagnet through an adaptive control method, and can adjust the controller parameters in real time according to the system status, so that the system can adapt to changes.

[0045] Exemplarily, in order to prevent the magnetic field generated by the drill pipe electromagnet 3 and the short-joint electromagnet 4 from affecting the electromagnetic logging result of the logging short-joint 6, the drill pipe electromagnet 3 and the short-joint electromagnet 4 generate a high-frequency electromagnetic field.

[0046] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0047] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A magnetically suspended logging sub, characterized in that: include: An execution module, used for generating a magnetic field capable of suspending the logging sub; Well logging module, used for the collection, reception, transmission, storage of well logging data and control of magnetic field; The power management module is used to supply power to the above parts and control the magnetic field as an actuator.

2. The magnetically suspended logging sub according to claim 1, characterized in that: The execution module comprises a drill pipe electromagnet (3) and a short section electromagnet (4); the short section electromagnet (4) is arranged on the outer wall of the well logging short section (6), and the drill pipe electromagnet (3) is arranged on the inner wall of the drill pipe (1).

3. The magnetically suspended logging sub according to claim 2, characterized in that: The execution module further comprises a drill pipe electromagnet (3) arranged between the inner walls of the drill pipe (1) below the logging pup joint (6), and a pup joint electromagnet (4) arranged at the bottom of the logging pup joint (6).

4. The magnetically suspended logging sub according to claim 2, characterized in that: The execution module also includes a drill pipe magnetic shielding layer (2) and a short-joint magnetic shielding layer (5), wherein the drill pipe magnetic shielding layer (2) is arranged between the drill pipe electromagnet (3) and the drill pipe (1), and the short-joint magnetic shielding layer (5) is arranged between the short-joint electromagnet (4) and the logging short-joint (6).

5. The magnetically suspended logging sub according to claim 2, characterized in that: The logging module shown includes a main control unit, a storage unit and a sensor unit. The sensor unit is used to collect logging data, the main control unit is used to receive and transmit logging data and control the magnetic field, and the storage unit is used to store logging data.

6. The magnetically suspended logging sub according to claim 5, characterized in that: The sensor unit comprises a Hall sensor, which is placed at the center of the coil of the short-section electromagnet (4) and is used to measure the relative displacement between the measuring short section (6) and the drill rod (1).

7. The magnetically suspended logging sub according to claim 6, characterized in that: The main control unit determines the position change of the logging sub (6) according to the relative displacement data collected by the Hall sensor, and controls the power management module accordingly to adjust the supply current of the electromagnet in a certain area, thereby achieving real-time position adjustment of the logging sub (6).

8. The magnetically suspended logging sub according to claim 2, characterized in that: The output current of the power management module drives the drill pipe electromagnet (3) and the short section electromagnet (4) to generate a magnetic field, so that the logging short section (6) can be suspended in the drill pipe (1).

9. The magnetically suspended logging sub according to claim 2, characterized in that: The power management module and the logging module together form a logging subsection (6), and the power management module is disposed in the upper part of the logging subsection (6).

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