Intelligent reducing reaming nipple for well drilling and related well drilling method

Abstract

The invention discloses an intelligent reducing reaming nipple for well drilling and a related well drilling method. The short section comprises a short section body, a pair of voltage monitoring sheets, a pair of detection magnetic sheets and a plurality of groups of control execution devices, each group of control execution devices comprises a controller assembly, a pair of propelling block assemblies and a cutting block; the nipple body is cylindrical; the pair of voltage monitoring sheets and the pair of detection magnetic sheets are arranged on the inner wall of the body; the multiple sets of control execution devices are arranged on the outer wall of the short section body in the circumferential direction of the short section body. In each group of control execution devices, the chip cutting block is clamped between a pair of pushing block assemblies; and the controller assembly is used for controlling the propelling block assembly to move forwards or retract by a preset distance according to the difference value between the voltage signals monitored by the pair of voltage monitoring pieces. According to the method, intelligent reaming can be achieved during drilling according to the well necking condition, the reaming construction torque and the reaming drill jamming risk are greatly reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas drilling, and particularly to an intelligent variable-diameter reaming sub for drilling and related drilling methods. Background Art

[0002] As the exploration and development of shallow oil and gas reservoirs enter the middle and late stages, the drilling requirements for deep wells and ultra-deep wells are gradually increasing, and the encounter rate of complex formations has been greatly improved, especially in constricted formations. Constricted formations are prone to stuck pipe accidents, resulting in buried drill tools and even wellbore abandonment. Currently, for wellbore constriction, measures such as increasing the density of drilling fluid to enhance the support of the drilling fluid on the wellbore wall and using a reamer to ream the wellbore are usually taken. Increasing the density of drilling fluid will reduce the mechanical drilling rate and increase the risk of lost circulation. The reamer cannot automatically and selectively ream the wellbore, and it also increases the risk of wellbore sticking. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide an intelligent variable-diameter reaming sub for drilling and related drilling methods that can overcome the above problems or at least partially solve the above problems.

[0004] In a first aspect, an embodiment of the present invention provides an intelligent variable-diameter reaming sub for drilling, including: a sub body, a pair of voltage monitoring pieces and a pair of detection magnetic pieces, and multiple groups of control and execution devices. Each group of control and execution devices includes: a controller assembly, a pair of push block assemblies and a chip block;

[0005] The sub body is cylindrical;

[0006] The pair of voltage monitoring pieces and the pair of detection magnetic pieces are respectively arranged on the inner wall of the sub body;

[0007] The multiple groups of control and execution devices are arranged on the outer wall of the sub body along the circumferential direction of the sub body;

[0008] In each group of control and execution devices, the chip block is clamped between the pair of push block assemblies;

[0009] The pair of detection magnetic pieces is used to generate a magnetic field;

[0010] The controller assembly is used to control the push block assembly to move forward or retract a preset distance according to the difference between the voltage signals monitored by the pair of voltage monitoring pieces; the voltage signals monitored by the voltage monitoring pieces are generated under the action of the magnetic field when the fluid flows through the sub body;

[0011] The pair of push block assemblies is used to move forward or retract a preset distance relative to each other under the control of the controller assembly, so as to drive the chip block to move a preset distance along the radial direction of the sub body.

[0012] In one embodiment, the voltage monitoring sheet and the detection magnetic sheet are both arc-shaped sheets, and the voltage monitoring sheet and the detection magnetic sheet are respectively attached to the inner wall of the short section body and are spaced apart from each other, and the line connecting a pair of voltage monitoring sheets is perpendicular to the line connecting a pair of detection magnetic sheets.

[0013] In one embodiment, the propulsion block assembly comprises:

[0014] A motor and a propulsion block connected to the motor;

[0015] The motor is threadedly connected to the propulsion block via a screw rod; the motor is used to drive the propulsion block to advance or retract via the screw rod.

[0016] In one embodiment, the push block is wedge-shaped and has a stepped surface;

[0017] The chip block has a side facing the short section body, and both ends thereof are provided with shoulders adapted to the stepped surface of the propulsion block, and a side of the chip block facing away from the short section body is inlaid with a polycrystalline diamond composite sheet for cutting formations;

[0018] The shoulders at both ends of the chip block are respectively overlapped on the step-shaped surfaces of the two propulsion blocks.

[0019] In one embodiment, a transition section with an inclined surface or a curved surface is provided between steps of different heights on the shoulder of the chip block;

[0020] A transition section with an inclined surface or an arc surface is arranged between the step-shaped surfaces of the pushing block.

[0021] In one embodiment, the chip block is further provided with a fixing key, and the short section body is provided with upper and lower fixing grooves for the chip block;

[0022] The fixing key is radially clamped in the upper and lower fixing grooves of the chip block along the short section body.

[0023] In one embodiment, the controller assembly includes: a battery and a controller; the battery and the controller are stacked up and down;

[0024] The short section body is also provided with a control actuator installation slot, and the battery and the controller are stacked up and down in the control actuator installation slot.

[0025] In one embodiment, the intelligent variable diameter reaming short sub for drilling further includes: a controller fixed pressing block and a chip block fixed pressing block;

[0026] The short section body is also provided with a fixed pressing block groove; the bottoms of the controller fixed pressing block and the chip block fixed pressing block are embedded in the fixed pressing block groove;

[0027] The controller fixing block is arranged at the controller assembly to prevent the controller assembly from moving along the radial direction;

[0028] The chip block fixing block is arranged outside the chip block to prevent the chip block from moving along the radial direction.

[0029] In one embodiment, the controller is a single-chip microcomputer, and a program is set in the controller. When the program runs, it executes the following method: According to the difference between the voltage signals monitored by a pair of voltage monitoring chips, determine the change in the displacement of the fluid flowing through the nipple body, and according to the change in the displacement, send a drive signal to the motor in the push block assembly to drive the motor to rotate forward or backward a set number of turns, so as to drive the push block to advance a preset distance, or retract a preset distance, drive the chip block to move radially outward, or retract radially inward.

[0030] In a second aspect, an embodiment of the present invention provides a method for drilling using the intelligent variable-diameter reaming nipple for drilling as described above, including:

[0031] During the drilling process, determine the difference between the voltage signals on the pair of voltage monitoring chips by monitoring the voltage signals of the fluid flowing through the nipple by the pair of voltage monitoring chips of the nipple;

[0032] Detect the change in the displacement of the fluid flowing through the nipple body according to the difference between the voltage signals on the pair of voltage monitoring chips;

[0033] According to the change in the displacement, send a drive signal to the motor in the push block assembly to drive the motor to rotate forward or backward a set number of turns, so as to drive the push block in the nipple to advance a preset distance, or retract a preset distance, and further drive the chip block in the nipple to move radially outward, or retract radially inward.

[0034] The beneficial effects of the above technical solutions provided by the embodiments of the present invention at least include:

[0035] The intelligent variable-diameter reaming nipple for drilling provided by the embodiment of the present invention can monitor the change in the fluid displacement passing through the nipple through the difference in voltage monitored by a pair of voltage monitoring chips, and according to the monitored displacement change, control the chip block to move along the radial direction of the nipple body in real time to change the outer diameter of the reaming nipple, so as to realize intelligent reaming according to the wellbore necking situation during drilling, greatly reduce the reaming construction torque and the risk of reaming sticking, and improve production efficiency.

[0036] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the written description, claims, as well as the drawings.

[0037] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0038] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings:

[0039] Figure 1 It is the front view of the intelligent variable-diameter reaming sub for drilling in the embodiment of the present invention;

[0040] Figure 2 It is the structural schematic diagram of the voltage monitoring piece and the detection magnetic piece in the embodiment of the present invention;

[0041] Figure 3 It is the top view of the intelligent variable-diameter reaming sub for drilling in the embodiment of the present invention;

[0042] Figure 4 It is the longitudinal sectional view of the intelligent variable-diameter reaming sub for drilling in the embodiment of the present invention;

[0043] Figure 5 It is the structural schematic diagram of the propulsion block assembly in the embodiment of the present invention;

[0044] Figure 6 It is the structural schematic diagram of the chip block in the embodiment of the present invention;

[0045] Figure 7 It is the longitudinal sectional view of the sub body in the embodiment of the present invention;

[0046] Figure 8 It is the structural schematic diagram of the controller assembly in the embodiment of the present invention;

[0047] Figure 9 It is the structural schematic diagram of the chip block fixing press block in the embodiment of the present invention;

[0048] Figure 10 It is the structural schematic diagram of the controller fixing press block in the embodiment of the present invention;

[0049] Figure 11 It is the front view of the sub body in the embodiment of the present invention;

[0050] Figure 12 It is the schematic diagram of the internal circuit components of the controller in the embodiment of the present invention.

[0051] Description of the reference numerals:

[0052] 1. Stub body; 2. Chip block; 3. Pusher block assembly; 4. Controller assembly; 6. Controller fixing clamp; 7. Chip block fixing clamp;

[0053] 1-1. Installation groove for voltage monitoring piece and detection magnetic piece; 1-2. Installation groove for control execution device; 1-3. Fixing clamp groove; 1-4. Upper and lower fixing grooves for chip block;

[0054] 2-1. Fixed key; 2-2. Shoulder; 2-3. PDC composite sheet;

[0055] 3-1. Motor; 3-2. Screw; 3-3. Pusher block;

[0056] 4-1. Battery; 4-2. Controller;

[0057] 5-1. Voltage monitoring piece; 5-2. Detection magnetic piece. Detailed implementation manners

[0058] Hereinafter, exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0059] An embodiment of the present invention provides an intelligent variable-diameter reaming stub for drilling, referring to Figure 1 and Figure 4 as shown, including: a stub body 1, a pair of voltage monitoring pieces 5-1 and a pair of detection magnetic pieces 5-2, and multiple groups of control execution devices, each group of control execution devices including: a controller assembly 4, a pair of pusher block assemblies 3 and a chip block 2; wherein:

[0060] The stub body 1 is cylindrical;

[0061] The pair of voltage monitoring pieces 5-1 and the pair of detection magnetic pieces 5-2 are arranged on the inner wall of the stub body 1;

[0062] The multiple groups of control execution devices are arranged on the outer wall of the stub body 1 along the circumferential direction of the stub body 1;

[0063] In each group of control execution devices, the chip block 2 is clamped between the pair of pusher block assemblies 3;

[0064] The controller component 4 is configured to control the forward or retraction movement of the propulsion block component 3 by a preset distance according to the voltage signals and magnetic field signals collected by the voltage monitoring piece 5-1 and the detection magnetic piece 5-2.

[0065] The pair of propulsion block components 3 are configured to move forward or retract relative to each other by a preset distance under the control of the controller component 4, so as to drive the chip block 2 to move by a preset distance along the radial direction of the short joint body 1.

[0066] The intelligent variable-diameter reaming short joint for drilling provided by the embodiment of the present invention can monitor the change in the fluid displacement passing through the short joint by the difference in the voltages monitored by a pair of voltage monitoring pieces, and according to the monitored displacement change, control the chip block to move along the radial direction of the short joint body in real time to change the outer diameter of the reaming short joint, so as to realize intelligent reaming according to the wellbore necking situation during drilling, greatly reducing the reaming construction torque and the risk of reaming sticking, and improving the production efficiency.

[0067] Further, as shown in Figure 2 and Figure 3 the voltage monitoring piece 5-1 and the detection magnetic piece 5-2 in the intelligent variable-diameter reaming short joint for drilling are both arc-shaped sheets, and the pair of voltage monitoring pieces 5-1 and the pair of detection magnetic pieces 5-2 are attached to the inner wall of the short joint body 1 and are arranged at intervals.

[0068] In order to enable the voltage monitoring piece 5-1 and the detection magnetic piece 5-2 to be attached to the inner wall of the short joint body 1, their arcs can be the same as the arc of the inner wall of the short joint body 1.

[0069] As can be seen from Figure 3 the voltage monitoring piece 5-1 and the detection magnetic piece 5-2 are respectively two, the voltage monitoring piece 5-1 and the detection magnetic piece 5-2 are arranged at intervals, and the connection line of the two voltage monitoring pieces is perpendicular to the connection line of the two detection magnetic pieces.

[0070] The advantage of arranging the voltage monitoring piece 5-1 and the detection magnetic piece 5-2 at intervals is that it can reduce and avoid the interference between these two different detection devices.

[0071] As shown in Figure 7 the short joint body 1 is cylindrical, with threads at the top for connecting to the upper drill tool, and voltage monitoring piece and detection magnetic piece installation grooves 1-1 are provided on its inner wall for installing the voltage monitoring piece 5-1 and the detection magnetic piece 5-2.

[0072] In one embodiment, in the intelligent variable-diameter reaming sub for drilling provided by the embodiments of the present invention, each set of controller components 4, propulsion block components 3, and chip blocks 2 are all arranged along the axial direction of the sub body. Different sets can be arranged at different positions in the circumferential direction. The controller components 4, propulsion block components 3, and chip blocks 2 within the same set can be arranged along the axial direction of the sub.

[0073] In one embodiment, for the intelligent variable-diameter reaming sub for drilling provided by the embodiments of the present invention, as shown in Figure 5 the propulsion block component 3 includes:

[0074] a motor 3-1 and a propulsion block 3-3 connected to the motor 3-1;

[0075] The motor 3-1 is threadedly connected to the propulsion block 3-3 through a screw 3-2; the motor 3-1 is used to drive the propulsion block 3-3 to move forward or backward through the screw 3-2.

[0076] The above-mentioned motor 3-1 can be, for example, a stepping motor, which rotates a specified number of turns according to the instructions issued by the controller component, and cooperates with the propulsion block 3-3 through the screw 3-2.

[0077] Specifically, as shown in Figure 5 and Figure 6 the propulsion block 3-3 is wedge-shaped and has a stepped surface;

[0078] On one side of the chip block 2 facing the sub body 1, shoulders 2-2 adapted to the stepped surfaces of the propulsion block 3-3 are respectively provided at both ends. On the side of the chip block 2 facing away from the sub body 1, polycrystalline diamond compact (PDC compact) 2-3 for cutting the formation is inlaid;

[0079] The PDC compact 2-3 has the high hardness, high wear resistance, and thermal conductivity of diamond, and also has the strength and impact toughness of cemented carbide.

[0080] As shown in Figure 4 and Figure 6 the shoulders 2-2 at both ends of the chip block 2 are respectively lapped on the stepped surfaces of the two propulsion blocks 3-3.

[0081] It can be seen from Figure 4 that the two propulsion block components 3 "squeeze" the chip block 2 towards the middle, causing the chip block 2 to expand radially, thereby achieving the purpose of expanding the outer diameter of the sub.

[0082] In order to make it easier for the propulsion block to push the chip block, in one embodiment, a transition section with an inclined surface or an arc surface is provided between the steps with different heights on the shoulder of the chip block 2;

[0083] Between the stepped surfaces of the pushing block, a transition section with an inclined surface or an arc surface is provided.

[0084] Under the action of the pushing block 3-3, the chip block 2 can move radially. To prevent it from shifting axially, its axial position needs to be limited.

[0085] Refer to Figure 6 and Figure 7 As shown, a fixing key 2-1 is also provided on the chip block 2, and chip block upper and lower fixing grooves 1-4 are provided on the short joint body 1;

[0086] The fixing key 2-1 is radially clamped in the chip block upper and lower fixing grooves 1-4 along the short joint body 1.

[0087] In one embodiment, refer to Figure 8 As shown, the controller assembly 4 includes: a battery 4-1 and a controller 4-2; the battery 4-1 and the controller 4-2 are stacked vertically;

[0088] Refer to Figure 7 As shown, a control actuator mounting groove 1-2 is also provided on the short joint body 1, and the battery 4-1 and the controller 4-2 are stacked vertically in the control actuator mounting groove.

[0089] In one embodiment, for the above intelligent variable-diameter reaming sub for drilling, refer to Figure 1 、 Figure 9 and Figure 10 As shown, it further includes: a controller fixing pressing block 6 and a chip block fixing pressing block 7;

[0090] Correspondingly, refer to Figure 1 、 Figure 7 and Figure 11 As shown, a fixing pressing block groove 1-3 is also provided on the short joint body 1; the bottoms of the controller fixing pressing block 6 and the chip block fixing pressing block 7 are embedded in the fixing pressing block groove 1-3;

[0091] The controller fixing pressing block 6 is arranged at the controller assembly 4 to prevent the controller assembly 4 from moving radially;

[0092] The chip block fixing pressing block 7 is arranged outside the chip block 2 to prevent the chip block 2 from moving radially.

[0093] In one embodiment, the above-mentioned controller 4-2 is a single-chip microcomputer, and a program is set in the controller. When the program runs, it executes the following method: Determine the change in the displacement of the fluid flowing through the short section body according to the difference between the voltage signals monitored by a pair of voltage monitoring chips, and according to the change in the displacement, send a driving signal to the motor in the push block assembly to drive the motor to rotate forward or backward by a set number of turns, so as to drive the push block to advance a preset distance, or retract a preset distance, drive the chip block to move radially outward, or retract radially inward.

[0094] The battery is used to supply power to the controller and the motor, and the controller core is a 51 single-chip microcomputer.

[0095] The inside of the push block 3-3 is threaded and cooperates with the screw rod 3-2. According to the rotation of the screw rod 3-2, it advances or retreats, thereby driving the chip block to extend or retract, realizing variable diameter.

[0096] The installation steps of the above-mentioned intelligent variable-diameter reaming sub for drilling are described as follows:

[0097] I. Install the voltage monitoring chip and the detection magnetic chip in the installation grooves of the voltage monitoring chip and the detection magnetic chip through screws;

[0098] II. Write the control program into the controller;

[0099] III. Install the battery and the controller at the designated positions in the installation groove and fix them with the controller fixing block and the pin;

[0100] IV. Install the motor + push block at the designated positions in the installation groove and fix them with the fixing block and the pin;

[0101] V. Install the chip block at the designated positions in the installation groove and fix them with the fixing block and the pin.

[0102] The structural schematic diagram of the circuit components inside a controller can be referred to Figure 12 as shown. 805C1 is a single-chip microcomputer, ADC0832 is an A / D conversion chip, and ULN2003 is a driving chip. The A / D conversion chip and the driving chip are respectively connected to the single-chip microcomputer.

[0103] Based on the same inventive concept, the embodiment of the present invention also provides a method for drilling using the intelligent variable-diameter reaming sub for drilling as described above. Since the principle of the problem solved by the method is similar to that of the intelligent variable-diameter reaming sub for drilling described above, the implementation of this method can refer to the implementation of the above method, and the repeated parts will not be described again.

[0104] A method for drilling using the intelligent variable-diameter reaming sub for drilling as described above provided by the embodiment of the present invention includes the following steps:

[0105] S1. During the drilling process, determine the difference between the voltage signals on a pair of voltage monitoring pieces of the nipple by monitoring the voltage signals of the fluid flowing through the nipple with the pair of voltage monitoring pieces of the nipple;

[0106] S2. Detect the change in the displacement of the fluid flowing through the body of the nipple according to the difference between the voltage signals on the pair of voltage monitoring pieces;

[0107] S3. According to the change in the displacement, send a driving signal to the motor in the push block assembly to drive the motor to rotate forward or backward a set number of turns, so as to drive the push block in the nipple to advance a preset distance, or retract a preset distance, and then drive the chip block in the nipple to move radially outwards, or retract radially inwards.

[0108] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) containing computer-usable program code.

[0109] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0110] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means realizes the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0111] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus, so that a series of operation steps are performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions for implementing the steps specified in one process or multiple processes and / or blocks Figure 1 one process or multiple processes and / or blocks Figure 1 and / or steps for implementing the functions specified in one block or multiple blocks.

[0112] 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 equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. An intelligent variable-diameter reaming sub for drilling, characterized in that, include: The short section body, a pair of voltage monitoring sheets and a pair of detection magnetic sheets, and a plurality of control execution devices, each control execution device group includes: a controller assembly, a pair of propulsion block assemblies and a chip block; The short section body is cylindrical; The pair of voltage monitoring sheets and the pair of detection magnetic sheets are respectively arranged on the inner wall of the short section body; The plurality of control actuators are arranged on the outer wall of the short section body along the circumference of the short section body; In each set of control actuators, the chip block is clamped between the pair of propulsion block assemblies; The pair of detection magnetic sheets is used to generate a magnetic field; The controller assembly is used to control the propulsion block assembly to move forward or retract a preset distance according to the difference between the voltage signals monitored by the pair of voltage monitoring sheets; the voltage signal monitored by the voltage monitoring sheet is generated under the action of the magnetic field when the fluid flows through the short section body; The pair of propulsion block assemblies are used to relatively move forward or retract a preset distance under the control of the controller assembly to drive the chip block to move a preset distance along the radial direction of the short section body.

2. The intelligent variable-diameter reaming sub for drilling as claimed in claim 1, wherein The voltage monitoring sheet and the detection magnetic sheet are both arc-shaped sheets, and are respectively attached to the inner wall of the short section body and spaced apart from each other. The connecting line of a pair of voltage monitoring sheets is perpendicular to the connecting line of a pair of detection magnetic sheets.

3. The intelligent variable-diameter reaming sub for drilling as claimed in claim 1, wherein, The propulsion block assembly comprises: A motor and a propulsion block connected to the motor; The motor is threadedly connected to the propulsion block via a screw rod; the motor is used to drive the propulsion block to advance or retract via the screw rod.

4. The intelligent variable-diameter reaming sub for drilling as claimed in claim 3, wherein, The propulsion block is wedge-shaped and has a stepped surface; The chip block has a side facing the short section body, and both ends thereof are provided with shoulders adapted to the stepped surface of the propulsion block, and a side of the chip block facing away from the short section body is inlaid with a polycrystalline diamond composite sheet for cutting the formation; The shoulders at both ends of the chip block are respectively overlapped on the step-shaped surfaces of the two propulsion blocks.

5. The intelligent variable-diameter reaming sub for drilling as claimed in claim 4, wherein, A transition section with an inclined surface or a curved surface is provided between steps of different heights on the shoulder of the chip block; A transition section with an inclined surface or an arc surface is arranged between the step-shaped surfaces of the pushing block.

6. The intelligent variable-diameter reaming sub for drilling as claimed in claim 4, wherein, The chip block is also provided with a fixing key, and the short section body is provided with upper and lower fixing grooves for the chip block; The fixing key is radially clamped in the upper and lower fixing grooves of the chip block along the short section body.

7. The intelligent variable-diameter reaming sub for drilling as described in any one of claims 1-6, characterized in that, The controller assembly includes: a battery and a controller; the battery and the controller are stacked up and down; The short section body is also provided with a control actuator installation slot, and the battery and the controller are stacked up and down in the control actuator installation slot.

8. The intelligent variable-diameter reaming sub for drilling as claimed in any one of claims 1-6, characterized in that, Also includes: A controller fixed pressing block and a chip block fixed pressing block; The short section body is also provided with a fixing block groove; The bottoms of the controller fixed pressing block and the chip block fixed pressing block are embedded in the fixed pressing block groove; The controller fixing block is arranged at the controller component to prevent the controller component from moving along the radial direction; The chip block fixing pressing block is arranged outside the chip block to prevent the chip block from moving along the radial direction.

9. The intelligent variable-diameter reaming sub for drilling as claimed in claim 7, wherein, The controller is a single-chip microcomputer, and a program is set in the controller. When the program runs, it executes the following method: Determine the displacement change of the fluid flowing through the nipple body according to the difference between the voltage signals monitored by a pair of voltage monitoring chips, and send a driving signal to the motor in the push block assembly according to the displacement change to drive the motor to rotate forward or reverse a set number of turns, so as to drive the push block to advance a preset distance, or retract a preset distance, and drive the chip block to move radially outward or retract radially inward.

10. A method for drilling using the intelligent variable-diameter reaming sub for drilling as described in any one of claims 1-9, characterized in that, Including: During the drilling process, determine the difference between the voltage signals on the pair of voltage monitoring chips by monitoring the voltage signals of the fluid flowing through the nipple with the pair of voltage monitoring chips of the nipple; Detect the displacement change of the fluid flowing through the nipple body according to the difference between the voltage signals on the pair of voltage monitoring chips; Send a driving signal to the motor in the push block assembly according to the displacement change to drive the motor to rotate forward or reverse a set number of turns, so as to drive the push block in the nipple to advance a preset distance, or retract a preset distance, and further drive the chip block in the nipple to move radially outward or retract radially inward.

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