Intelligent guiding rotating nipple for drilling and control method and drilling tool thereof

Abstract

This invention relates to the fields of geothermal and oil and gas drilling, and particularly to an intelligent directional rotary sub for drilling, its control method, and drilling tools. The intelligent directional rotary sub includes: a sub body connected to a first drill string; a sliding pin and a sliding groove respectively connected to the sub body, the sliding pin being movable between a first and a second position, and the sliding groove further connected to a second drill string; in the first position, the sliding pin and the sliding groove are separated, the sliding pin rotating with the sub body along with the first drill string, and the sliding groove rotating with the second drill string; in the second position, the sliding pin and the sliding groove are engaged, the sliding pin driving the sliding groove and the second drill string to rotate with the sub body along with the first drill string. This intelligent directional rotary sub can be attached to the upper part of a single-bend screw, allowing the drill string above the sub to rotate slowly without affecting the combined use of the drill string below the sub, greatly reducing the sliding section of the drill string, significantly reducing the drag pressure caused by sliding drilling, and improving drilling efficiency.

Description

Technical Field

[0001] This invention relates to the fields of geothermal and oil and gas drilling, and in particular to a smart directional rotary sub for drilling and its control method. This invention also relates to a drilling tool including a smart directional rotary sub for drilling. Background Technology

[0002] With the exploration and development of oil and gas fields, the demand for drilling wells with large inclinations and extended reach is gradually increasing due to limitations in surface conditions. Dragging pressure is a common problem during drilling. Currently, the most mature technology for this is rotary steerable drilling, but it is expensive. Conventional directional drilling uses a single-bend screw sliding drill, where only the drill bit rotates while the rest rests on the wellbore, significantly increasing friction. While single-bend screw sliding drilling can meet the requirements for wells with small inclinations and limited reach, it is less efficient in wells with large inclinations and extended reach due to drill string drag.

[0003] Therefore, there is still room for improvement in existing technologies. Summary of the Invention

[0004] This application summarizes various aspects of the embodiments and should not be construed as limiting the claims. Other implementations are contemplated based on the technology described herein, as will be apparent to those skilled in the art upon studying the following drawings and detailed descriptions, and these implementations are intended to be included within the scope of this application.

[0005] To address the problems existing in the prior art, the purpose of this invention is to provide an intelligent directional rotary sub for drilling, which is attached to the upper part of a single-bend screw. During directional drilling, the drill string above the sub can rotate slowly without affecting the combined use of the drill string below the sub. This can greatly reduce the sliding section of the drill string, significantly reduce the drag pressure on the drill string caused by sliding drilling, and improve drilling efficiency.

[0006] Specifically, according to one aspect of the present invention, the present invention provides an intelligent steerable rotary sub for drilling, comprising: a sub body connected to a first drill string; a sliding pin and a sliding groove respectively connected to the sub body, wherein the sliding pin is movable between a first position and a second position, and the sliding groove is further connected to a second drill string; wherein, in the first position, the sliding pin and the sliding groove are separated, the sliding pin rotates together with the sub body with the first drill string, and the sliding groove rotates with the second drill string; in the second position, the sliding pin and the sliding groove are engaged, and the sliding pin drives the sliding groove and the second drill string to rotate together with the sub body with the first drill string.

[0007] In an embodiment of the present invention, the sliding pin includes a sliding pin body and a sliding pin extension extending from the sliding pin body, and the slide groove includes a slide groove body and a keyway disposed within the slide groove body. When the sliding pin is in the second position, the keyway receives at least a portion of the sliding pin extension.

[0008] In an embodiment of the present invention, the sliding pin is connected to the short section body via a driving component, the driving component including a motor and a screw connected to the motor, and the sliding pin further includes a screw hole provided on the sliding pin body for receiving the screw, and the sliding pin moves between the first position and the second position under the action of the motor via the screw.

[0009] In an embodiment of the present invention, the intelligent guide rotary sub for drilling further includes a key disposed on the sub body between the sliding pin and the groove. When the sliding pin is in the second position, the first drill bit transmits torque to the second drill bit through the key.

[0010] In an embodiment of the present invention, the key pin is located between the two sliding pin extensions.

[0011] In an embodiment of the present invention, the sliding pin is sleeved on the upper part of the sub body, the sliding groove is sleeved on the lower part of the sub body, and the lower part includes a first shoulder disposed thereon, and the sliding groove includes a second shoulder disposed on the sliding groove body and cooperating with the first shoulder to prevent the second drill bit from slipping off.

[0012] In an embodiment of the present invention, the intelligent guide rotary sub for drilling further includes a magnetic plate and a voltage monitoring plate disposed on the sub body, the magnetic plate and the voltage monitoring plate being located above the sliding pin.

[0013] In an embodiment of the present invention, the rotating short section is cylindrical, and a plurality of magnetic plates and a plurality of voltage monitoring plates are arranged at circumferential intervals along the cylindrical shape, with the lines connecting pairs of magnetic plates intersecting the lines connecting pairs of voltage monitoring plates.

[0014] In an embodiment of the present invention, two magnetic plates and two voltage monitoring plates are arranged circumferentially along the cylindrical shape, and the line connecting the two magnetic plates is perpendicular to the line connecting the two voltage monitoring plates.

[0015] In an embodiment of the present invention, the intelligent guide rotary sub for drilling further includes a sheath connected to the sub body and the groove.

[0016] In an embodiment of the present invention, the intelligent guide rotary sub for drilling further includes a first sealing ring disposed between the sub body and the groove, and a second sealing ring disposed between the groove and the sheath.

[0017] According to another aspect of the present invention, a control method for an intelligent steerable rotary sub for drilling is provided, comprising the steps of: determining whether directional drilling or combined drilling is required based on a measured voltage; in response to the requirement of directional drilling, positioning the slide pin in a first position; and in response to the requirement of combined drilling, positioning the slide pin in a second position.

[0018] In an embodiment of the present invention, the step of positioning the sliding pin in a first position in response to the need for directional drilling includes: in response to the need for directional drilling, controlling a motor to rotate in a first direction to separate the sliding pin from the slide groove, wherein the sliding pin and the sub-body rotate together with a first drill bit connected to the sub-body, and the slide groove rotates with a second drill bit connected to the slide groove; and the step of positioning the sliding pin in a second position in response to the need for compound drilling includes: in response to the need for compound drilling, controlling a motor to rotate in a second direction opposite to the first direction to engage the sliding pin and the slide groove, wherein the sliding pin drives the slide groove and the second drill bit to rotate together with the sub-body with the first drill bit.

[0019] According to another aspect of the invention, a drilling tool is provided, which includes the aforementioned intelligent directional rotary sub for drilling.

[0020] The intelligent directional rotary sub for drilling described in this invention can be attached to the upper part of a single-bend screw. The drill string above the sub can rotate slowly without affecting the combined use of the drill string below the sub. This greatly reduces the sliding section of the drill string, significantly reduces the drag pressure caused by sliding drilling, and improves drilling efficiency. It is especially suitable for situations with large displacement and large deviated wells where sliding directional drag pressure is severe, and can reduce the drag pressure caused by sliding drilling, thereby improving drilling efficiency.

[0021] Upon studying the following description, claims and drawings, those skilled in the art will understand and recognize these and other aspects, objects and features of this disclosure. Attached Figure Description

[0022] To gain a more complete understanding of the embodiments of this application, reference should be made to the embodiments described in more detail in the accompanying drawings and by way of example below, wherein:

[0023] Figure 1a A schematic diagram of the structure of the intelligent directional rotary sub for drilling provided in an embodiment of the present invention is shown;

[0024] Figure 1b It shows Figure 1aThe diagram shows a cross-sectional view of a smart steerable rotary sub for drilling.

[0025] Figure 1c It shows Figure 1a A three-dimensional view of a drilling intelligent steerable rotary sub, in which the sheath has been removed for clarity, and the sliding pin of the drilling intelligent steerable rotary sub is in the first position;

[0026] Figure 1d It shows Figure 1a A three-dimensional view of a drilling intelligent steerable rotary sub, in which the sheath has been removed for clarity and the sliding pin of the drilling intelligent steerable rotary sub is in the second position;

[0027] Figure 2a This diagram shows a structural schematic of the sub-body of an intelligent guide rotary sub for drilling provided in an embodiment of the present invention;

[0028] Figure 2b It shows Figure 2a A cross-sectional view of the short section body shown;

[0029] Figure 3a A schematic diagram of the slide of the intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0030] Figure 3b It shows Figure 3a The cross-sectional view of the slide shown;

[0031] Figure 3c It shows Figure 3a A top view of the slide shown;

[0032] Figure 4 A schematic diagram of the pin key structure of the intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0033] Figure 5 A schematic diagram of the sliding pin structure of the intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0034] Figure 6 A schematic diagram of the drive component for an intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0035] Figure 7a A schematic diagram of the sheath of the intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0036] Figure 7b It shows Figure 7a The cross-sectional view of the sheath shown;

[0037] Figure 8aA schematic diagram of the magnetic sheet structure of the intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0038] Figure 8b A schematic diagram of the voltage monitoring chip of the intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0039] Figure 9 A schematic diagram of the sealing ring of the intelligent guide rotary sub for drilling provided in an embodiment of the present invention is shown;

[0040] Figure 10 A flowchart is shown of a control method for an intelligent steerable rotary sub for drilling provided by an embodiment of the present invention. Detailed Implementation

[0041] The following describes embodiments of the present disclosure. However, it should be understood that the disclosed embodiments are merely examples, and other embodiments may take various alternative forms. The drawings are not necessarily drawn to scale; certain functions may be exaggerated or minimized to show details of particular components. Therefore, the specific structural and functional details disclosed herein should not be construed as limiting, but merely as a representative basis for teaching those skilled in the art to use the application in various ways. As those skilled in the art will understand, various features shown and described with reference to any of the drawings may be combined with features shown in one or more other drawings to produce embodiments not explicitly shown or described. The combinations of features shown provide representative embodiments for typical applications. However, various combinations and modifications of features consistent with the teachings of this disclosure may be desirable for certain particular applications or implementations.

[0042] Furthermore, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or action from another, and do not necessarily require or imply any actual such relationship or order between these entities or actions. 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 may include not only those elements but also elements not expressly listed or inherent to such processes, methods, articles, or apparatuses.

[0043] According to one aspect of the present invention, a smart directional rotary sub 100 for drilling is provided, such as Figures 1a to 1d As shown, it includes: a short section body 1, which is connected to a first drill bit (not shown); a sliding pin 4 and a sliding groove 2 respectively connected to the short section body 1, wherein the sliding pin 4 can... Figure 1c The first position shown and Figure 1d The slide moves between the second positions shown, and the slide 2 is further connected to the second drill bit (not shown); wherein, in Figure 1cIn the first position shown, the sliding pin 4 and the sliding groove 2 are separated. The sliding pin 4 can rotate with the first drill bit along with the short section body 1, and the sliding groove 2 rotates with the second drill bit; in the... Figure 1d In the second position shown, the sliding pin 4 and the sliding groove 2 are engaged, and the sliding pin 4 can drive the sliding groove 2 and the second drill string to rotate together with the sub body 1 along with the first drill string. Under the concept of this invention, when directional drilling is required, the sliding pin 4 can be in the first position, at which time the sliding pin 4 is separated from the sliding groove 2, and the rotation of the first drill string does not affect the rotation of the second drill string. For example, the first drill string can rotate slowly without affecting the rotation of the second drill string, which can greatly reduce the sliding section of the drill string, greatly reduce the dragging pressure caused by sliding drilling, and improve the drilling efficiency of the sub. When composite drilling is required, the sliding pin 4 moves to the second position and engages with the sliding groove 2, so that the second drill string can rotate synchronously with the first drill string. In embodiments of this invention, the first drill string can be an upper drill string (e.g., a D127mm drill pipe or a D165mm drill collar) connected to the upper part of the intelligent directional rotary sub 100 for drilling, and the second drill string can be a lower drill string (e.g., a lower drill string connected by a single-bend screw) connected to the lower part of the intelligent directional rotary sub 100 for drilling. It should be understood that the second position described in this invention includes the case where at least a portion of the sliding pin 4 engages with the sliding groove 2. That is, although... Figure 1d The diagram shows a portion of the sliding pin extension of the sliding pin 4 (described in detail below) engaging with the slide groove 2, but the engagement of only a small portion or the entire sliding pin extension with the slide groove 2 is also included within the scope of this invention.

[0044] In embodiments of the present invention, further reference is made to Figure 2a and 2bThe short section body 1 is cylindrical and hollow with a certain wall thickness. From top to bottom, it is machined with the following: a first drill bit connection thread (not shown in the figure), a sheath fixing pin hole 1-1, a magnetic plate and voltage monitoring plate mounting groove 1-2, a drive component fixing pin hole 1-3, a key mounting groove 1-4, a first sealing ring groove 1-5, and a first shoulder 1-6. The short section body 1 can be connected to the first drill bit via the first drill bit connection thread. The sheath fixing pin hole 1-1, the magnetic plate and voltage monitoring plate mounting groove 1-2, the drive component fixing pin hole 1-3, and the key mounting groove 1-4 are respectively used to install the sheath 6, the magnetic plate 7-1 and the pressure monitoring plate 7-2 (collectively referred to as monitoring plate 7), the drive component, and the key 3. The first sealing ring groove 1-5 is used to receive the first sealing ring (not shown in the figure) that achieves a sealing connection with the slide groove 2. The first shoulder 1-6, also known as the anti-detachment shoulder, is used in conjunction with the second shoulder 2-3 in the slide groove 2. In one embodiment, the number of key mounting slots 1-4, magnetic sheet and voltage monitoring sheet mounting slots 1-2, and magnetic sheet and voltage monitoring sheet mounting slots 1-2 are all four, and they are all evenly distributed along the circumference of the short section body 1. In other embodiments, different numbers of key mounting slots 1-4, magnetic sheet and voltage monitoring sheet mounting slots 1-2, and magnetic sheet and voltage monitoring sheet mounting slots 1-2 can be provided as needed.

[0045] In embodiments of the present invention, further reference is made to Figures 3a-3c The slide groove 2 is a hollow cylindrical shape, with its inner diameter slightly larger than the outer diameter of the short section body 1, so that it can be fitted onto the short section body 1. A second sealing ring groove 2-1 is machined on the upper outer side of the slide groove 2. The second sealing ring groove 2-1 is used to receive the second sealing ring (not shown in the figure) that forms a sealing connection with the sheath 6. A keyway 2-2 is machined on the upper inner side of the slide groove 2. The keyway 2-2 can cooperate with the sliding pin 4. When at least a portion of the sliding pin 4 is inserted into the keyway 2-2 (i.e., the sliding pin 4 is in the second position), the first drill bit drives the second drill bit to rotate; when the sliding pin 4 disengages from the keyway 2-2 (i.e., the sliding pin 4 is in the first position), the rotation of the first drill bit does not affect the second drill bit. A second shoulder 2-3 is machined on the bottom of the slide groove 2, which can cooperate with the first shoulder 1-6 to prevent the second drill bit from slipping off.

[0046] In an embodiment of the present invention, the intelligent guide rotary sub 100 for drilling further includes a key 3 disposed on the sub body 1, located between the sliding pin 4 and the groove 2. Further reference Figure 4 The key 3 is a longitudinally elongated disc shape, with two symmetrically machined pin holes inside: the first pin hole 3-1 and the second pin hole 3-2. The key 3 is installed in the key mounting groove 1-4, cooperating with the sliding pin 4 and the sliding groove 2 to control the rotation of the second drill bit. Figure 1c and 1dAs shown, the key 3 is located between two adjacent sliding pin extensions 4-1. When the sliding pin extension 4-1 of the sliding pin 4 is at least partially inserted into the groove 2, the first drill bit transmits torque through the key 3, that is, to the second drill bit.

[0047] In embodiments of the present invention, further reference is made to Figure 5 The sliding pin 4 is generally a hollow cylindrical shape, including a sliding pin body 4-2, which has a ring-shaped structure. The sliding pin 4 also includes a sliding pin extension 4-1 extending from the sliding pin body 4-2. At least a portion of the sliding pin extension 4-1 can slide into and out of the keyway 2-2 of the slide groove 2 as described above. Figure 5 In the illustrated embodiment, four pin extensions 4-1 extend downward from the bottom of the pin body 4-2, and are evenly distributed circumferentially along the pin body 4-2. In other embodiments, other numbers of pin extensions may be provided. During combined drilling, at least a portion of each pin extension 4-1 can be inserted into its respective keyway 2-2 of the slide groove 2, enabling the first and second drill bits to move in tandem. At least one threaded hole 4-3 is uniformly machined circumferentially on the top surface of the pin body 4-2, and threads are machined within the threaded hole 4-3. The threaded hole 4-3 can mate with a screw 5-1 as described below, allowing the pin 4 to move up and down when the screw 5-1 rotates.

[0048] In embodiments of the present invention, further reference is made to Figure 6 , Figure 6 A driving component is shown, through which the sliding pin 4 is connected to the short section body 1. This driving component includes a motor 5-2 and a screw 5-1 connected to the motor 5-2, the screw 5-1 serving as the rotation shaft of the motor 5-2. Under the action of the motor 5-2, the screw 5-1 can rotate clockwise or counterclockwise, and the rotation of the screw 5-1 in turn drives the sliding pin 4 to move between a first position and a second position. In one embodiment, the motor 5-2 is a stepper motor.

[0049] The drive components also include a controller (also known as a detection controller) 5-3, which has a built-in battery and chip circuitry and is the intelligent core of the entire sub-section 100.

[0050] In an embodiment of the invention, the drilling smart guide rotary sub 100 further includes a sheath 6 connected to the sub body 1 and the groove 2. Further reference Figure 7a and Figure 7bThe sheath (also known as the controller sheath) 6 is cylindrical, with a diameter larger than the groove 2, and is used to protect the drive components, sliding pins 4, etc., so that they do not act on the well wall. In order to achieve fixation, the sheath 6 is provided with mounting holes 6-1 corresponding to the magnetic plate and pressure monitoring plate mounting grooves 1-2, and mounting holes 6-2 and 6-3 corresponding to the two holes in the pin mounting groove 1-4, for fixing the sheath 6 itself and the pins 3 to the short section body 1 respectively.

[0051] In an embodiment of the invention, the intelligent guide rotary sub 100 for drilling further includes a magnetic plate 7-2 and a voltage monitoring plate 7-1 disposed on the sub body 1, the magnetic plate 7-2 and the voltage monitoring plate 7-1 being located above the sliding pin 4. Further reference Figure 8a and Figure 8b Both the voltage monitoring piece 7-2 and the magnetic piece (also known as the detection magnetic piece) 7-1 are arc-shaped. The magnetic piece 7-1 is used to generate a magnetic field, and the voltage monitoring piece 7-2 is used to monitor the voltage. In one embodiment, a set flow rate can be monitored; different flow rates result in different measured voltages. The invention can generate different actions based on different measured voltages, such as executing the forward or reverse rotation of a motor. The magnetic piece 7-1 and the voltage monitoring piece 7-2 are located above the sliding pin 4. Multiple magnetic pieces 7-1 and multiple voltage monitoring pieces 7-2 are arranged at circumferential intervals along the short section body 1, and the lines connecting two pairs of magnetic pieces intersect the lines connecting two pairs of voltage monitoring pieces. In one embodiment, two magnetic pieces 7-1 and two voltage monitoring pieces 7-2 are arranged at circumferential intervals along the short section body 1, and the line connecting two magnetic pieces 7-1 is perpendicular to the line connecting two voltage monitoring pieces 7-2.

[0052] In an embodiment of the invention, the intelligent steerable rotary sub 100 for drilling further includes a sealing ring 8. Further reference Figure 9 The diagram shows a sealing ring 8, which is annular and seals the gap between the sliding groove 2 and the short section body 1 and the sheath 6. In one embodiment, the sealing ring 8 may include a first sealing ring and a second sealing ring, wherein the first sealing ring is disposed between the short section body 1 and the sliding groove 2, and the second sealing ring is disposed between the sliding groove 2 and the sheath 6.

[0053] In embodiments of the present invention, such as Figure 1a and 1b The installation steps for the intelligent steerable rotary sub 100 for drilling shown are as follows:

[0054] 1. Place the first sealing ring and the second sealing ring onto the short section body 1 and the slide groove 2 respectively;

[0055] 2. Fit the sliding groove 2 onto the short section body 1;

[0056] 3. The key 3 is installed in the key mounting slot 1-4 by means of a pin;

[0057] IV. The sliding pin 4 is fitted onto the short section body 1;

[0058] 5. Turn screw 5-1 into screw hole 4-3, and fix controller 5-3 and motor 5-2 to short section body 1 with pins;

[0059] 6. Place the sheath 6 onto the short section body 1 and secure it with pins;

[0060] 7. Install the magnetic sheet 7-1 and the voltage monitoring sheet 7-2 into the magnetic sheet and pressure monitoring sheet mounting slot 1-2, fix them with pins, and connect the power supply line;

[0061] 8. Write the program into the microcontroller.

[0062] According to another aspect of the present invention, a control method for the drilling intelligent steerable rotary sub 100 as described above is provided, such as... Figure 10 As shown, the method includes the following steps:

[0063] S1. Determine whether directional drilling or composite drilling is required based on the measured voltage;

[0064] S2. In response to the need for directional drilling, the sliding pin is positioned in the first position; and

[0065] S3. In response to the need for compound drilling, the sliding pin is positioned in the second position.

[0066] In an embodiment of the present invention, step S2 includes: in response to the need for directional drilling, controlling the motor to rotate in a first direction to separate the sliding pin from the slide groove, the sliding pin and the sub-body rotating together with the first drill bit connected to the sub-body, and the slide groove rotating with the second drill bit connected to the slide groove; and step S3 includes: in response to the need for compound drilling, controlling the motor to rotate in a second direction opposite to the first direction to engage the sliding pin and the slide groove, the sliding pin driving the slide groove and the second drill bit to rotate together with the sub-body with the first drill bit.

[0067] In one embodiment, the motor rotates in the forward direction to separate the sliding pin from the slide groove, and the motor rotates in the reverse direction to engage the sliding pin and the slide groove.

[0068] According to another aspect of the invention, a drilling tool is provided, which includes the drilling intelligent steerable rotary sub 100 as described above.

[0069] The present invention is illustrated below through specific embodiments:

[0070] refer to Figures 1a to 9The intelligent directional rotary sub 100 for drilling may include: a sub body 1, a groove 2, a key 3, a sliding pin 4, a controller 5-3, a motor 5-2, a sheath 6, a magnetic plate 7-1, a voltage monitoring plate 7-2, and a sealing ring 8. The various components of the intelligent directional rotary sub 100 are connected together by threads or pins. The sub 100 is attached to the upper part of a single-bend screw. During directional drilling, the drill string above the sub can rotate slowly without affecting the combined use of the drill string below the sub, greatly reducing the slippage section of the drill string and significantly reducing the drag pressure caused by slippage drilling, thus improving drilling efficiency.

[0071] The drilling intelligent directional rotary sub 100 consists of the following components from top to bottom: sub body 1, which is fixedly connected to all parts of sub 100; a slide groove 2, which is fixedly connected to the drill string below sub 100; the bottom of the slide groove 2 is sealed to the sub body 1 by a first sealing ring, and the top outer side is sealed to the sheath 6 by a second sealing ring; the inside has a keyway 2-2 that matches the pin extension 4-1 of the pin 4; when at least a portion of the pin extension 4-1 of the pin 4 is inserted into the keyway 2-2, the upper drill string drives the lower drill string to rotate; when the pin extension 4-1 of the pin 4 is disengaged from the keyway 2-2, the rotation of the upper drill string does not affect the lower drill string. The bottom of the slide groove 2 has a second shoulder 2-3 machined, which mates with the first shoulder 1-6 to prevent the bottom drill bit from slipping off. The key 3 has two symmetrically machined pin holes, namely the first pin hole 3-1 and the second pin hole 3-2, installed in the key mounting groove 1-4, mates with the sliding pin 4 and the slide groove 2, and controls the rotation of the bottom drill bit. When the sliding pin extension 4-1 of the sliding pin 4 is inserted into the keyway 2-2 of the slide groove 2, the upper drill bit transmits torque downwards through the key 3. The sliding pin 4 has four circumferentially machined sliding pin extensions 4-1 at its bottom. During compound drilling, the sliding pin extensions 4-1 are inserted into the keyway 2-2 of the slide groove 2, causing the upper and lower drill bits to move in tandem. The top of the sliding pin 4 is the sliding pin body 4-2, which has four circumferentially machined screw holes 4-3. The screw holes 4-3 are threaded and can mate with the screw 5-1. When the screw 5-1 rotates, the sliding pin 4 moves up and down; the motor 5-2 is a stepper motor, and the rotating shaft is the screw 5-1; the detection controller 5-3 has a built-in battery and chip circuit, detects and processes signals, controls the rotation of the motor, and through the forward and reverse rotation of the screw 5-1, makes the sliding pin 4 insert into and exit the sliding groove 2; the controller sleeve 6 protects the motor 5-2, the controller 5-2, and the sliding pin 4, etc., so that they do not act on the well wall; the voltage monitoring plate 7-2 and the detection magnetic plate 7-1, the two detection magnetic plates are used to generate a magnetic field, and the two voltage monitoring plates are used to monitor the voltage. The voltage monitoring plates are installed at intervals, and the line connecting the two voltage monitoring plates is perpendicular to the line connecting the two detection magnetic plates.

[0072] The intelligent directional rotary sub for drilling described in this invention can be attached to the upper part of a single-bend screw. The drill string above the sub can rotate slowly without affecting the combined use of the drill string below the sub. This greatly reduces the sliding section of the drill string, significantly reduces the drag pressure caused by sliding drilling, and improves drilling efficiency. It is especially suitable for situations with large displacement and large deviated wells where sliding directional drag pressure is severe, and can reduce the drag pressure caused by sliding drilling, thereby improving drilling efficiency.

[0073] This application is intended to illustrate how the disclosed technology and various embodiments can be used, and is not intended to limit its true scope and equivalent spirit and meaning. Furthermore, the foregoing description is not exhaustive of all possibilities or to limit the scope of protection to the precise forms disclosed. Changes and variations are possible in accordance with the foregoing teachings. The selected and illustrated embodiments provide the best illustration of the principles of the technology and its practical application, and enable those skilled in the art to use the disclosed technology for various conceivable specific applications with various modifications. Therefore, various changes and modifications made to the above embodiments without substantially departing from the spirit and principles of the technology described herein are intended to be included within the scope of this disclosure.

Claims

1. A smart directional rotary sub for drilling, characterized in that, include: A short section body, which is connected to the first drill bit; A sliding pin and a sliding groove are respectively connected to the short section body, wherein the sliding pin is movable between a first position and a second position, and the sliding groove is further connected to a second drill bit; In the first position, the sliding pin and the sliding groove are separated, the sliding pin rotates with the first drill bit together with the sub-body, and the sliding groove rotates with the second drill bit; in the second position, the sliding pin and the sliding groove are engaged, the sliding pin drives the sliding groove and the second drill bit to rotate with the first drill bit together with the sub-body; the sliding pin includes a sliding pin body and a sliding pin extension extending from the sliding pin body, and the sliding groove includes a sliding groove body and a keyway disposed within the sliding groove body. When the sliding pin is in the second position, the keyway receives at least a portion of the sliding pin extension; the sliding pin is connected to the sub-body via a driving component, the driving component including a motor and a screw connected to the motor, and the sliding pin further includes a screw hole disposed on the sliding pin body for receiving the screw. The sliding pin moves between the first position and the second position under the action of the motor via the screw.

2. The intelligent directional rotary sub for drilling according to claim 1, characterized in that, It further includes a key disposed on the short section body, located between the sliding pin and the groove, wherein when the sliding pin is in the second position, the first drill bit transmits torque to the second drill bit through the key.

3. The intelligent directional rotary sub for drilling according to claim 2, characterized in that, The key pin is located between the two sliding pin extensions.

4. The intelligent directional rotary sub for drilling according to claim 1, characterized in that, The sliding pin is sleeved on the upper part of the short section body, the sliding groove is sleeved on the lower part of the short section body, and the lower part includes a first shoulder disposed thereon. The sliding groove includes a second shoulder disposed on the sliding groove body and cooperating with the first shoulder to prevent the second drill bit from slipping off.

5. The intelligent directional rotary sub for drilling according to claim 4, characterized in that, It further includes a magnetic plate and a voltage monitoring plate disposed on the short section body, the magnetic plate and the voltage monitoring plate being located above the sliding pin.

6. The intelligent directional rotary sub for drilling according to claim 5, characterized in that, The rotating section is cylindrical, and multiple magnetic plates and multiple voltage monitoring plates are arranged at intervals along the circumference of the cylindrical shape, with the lines connecting pairs of magnetic plates intersecting the lines connecting pairs of voltage monitoring plates.

7. The intelligent directional rotary sub for drilling according to claim 6, characterized in that, Two magnetic plates and two voltage monitoring plates are arranged circumferentially along the cylindrical shape, and the line connecting the two magnetic plates is perpendicular to the line connecting the two voltage monitoring plates.

8. The intelligent directional rotary sub for drilling according to claim 1, characterized in that, It further includes a sheath connected to the short section body and the slide.

9. The intelligent directional rotary sub for drilling according to claim 8, characterized in that, It further includes a first sealing ring disposed between the short section body and the slide groove, and a second sealing ring disposed between the slide groove and the sheath.

10. A control method for an intelligent steerable rotary sub for drilling according to any one of claims 1-9, characterized in that, Includes the following steps: The determination of whether directional drilling or composite drilling is required is based on the measured voltage. In response to the need for directional drilling, the sliding pin is positioned in the first position; and In response to the need for compound drilling, the sliding pin is positioned in the second position.

11. The control method according to claim 10, characterized in that, The step of positioning the sliding pin in a first position in response to the need for directional drilling includes: in response to the need for directional drilling, controlling a motor to rotate in a first direction to separate the sliding pin from the groove, wherein the sliding pin and the sub-body rotate together with a first drill bit connected to the sub-body, and the groove rotates together with a second drill bit connected to the groove; and the step of positioning the sliding pin in a second position in response to the need for compound drilling includes: in response to the need for compound drilling, controlling a motor to rotate in a second direction opposite to the first direction to engage the sliding pin and the groove, wherein the sliding pin drives the groove and the second drill bit to rotate together with the sub-body with the first drill bit.

12. A drilling tool, characterized in that, The drilling intelligent steerable rotary sub includes any one of the preceding claims 1-9.

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