CN114135236B - Coiled tubing conveying drag reduction device and use method - Google Patents

Abstract

The invention discloses a coiled tubing conveying damping device and a using method thereof, wherein the coiled tubing conveying damping device comprises a limiting mechanism, a damping mechanism, a control mechanism, a power mechanism and a shell; the coiled tubing conveying and drag reducing device is arranged in an annulus between the coiled tubing and a casing/open hole well wall, and is put into the well along with the coiled tubing when being arranged, and is anchored near a self-locking point of the coiled tubing in a drag reducing working state, wherein the position is calculated according to the well structure and the related parameters of the coiled tubing; the invention has the characteristics of economy, practicability, simple structure and convenient operation and maintenance.

Description

A coiled tubing transportation drag reduction device and method of use

Technical field

The invention belongs to the technical field of coiled tubing downhole tools, and specifically relates to a coiled tubing transportation drag reduction device and a method of use.

Background technique

In recent years, during the running operations of horizontal wells, highly deviated wells, vertical wells, etc., coiled tubing is used. During the drilling and running process, the coiled tubing produces and accumulates axial damage to the wellbore along the pipe string. Friction, and when the tubing string is lowered into the well, the friction between the coiled tubing and the casing will consume part of the effective load of the wellhead, resulting in buckling and self-locking of the coiled tubing, and the coiled tubing will still not go deep after several cycles. , causing the coiled tubing to be unable to reach the predetermined position, seriously restricting the on-site construction progress of the coiled tubing, increasing the cost of construction downtime, making subsequent operations impossible, and affecting the completion operation of the entire well.

The existing underground tractor is an underground crawler, also called an underground crawling mechanism, an underground tractor, an underground traction robot, an underground hydraulic pressurizer, an underground drill bit propeller, etc. It is an underground tool that can provide traction at the bottom of the well. Tractors can be divided into three types according to their movement principles: roller crawling type, crawler crawling type (chain rail type) and grasping arm telescopic sliding type (stepping type). However, due to design reasons, most of the existing tractors in China have complex structures and poor reliability, large downhole friction, difficulty in setting and taking out, and difficulty in applying weight on bit.

Contents of the invention

In order to overcome the above technical problems, the purpose of the present invention is to provide a coiled tubing transportation drag reduction device and a method of use, which are economical and practical, have a simple structure, and are easy to operate and maintain.

In order to achieve the above objects, the technical solution adopted by the present invention is:

A coiled oil pipe transportation drag reduction device. The coiled oil pipe transportation drag reduction device includes a limiting mechanism, a drag reduction mechanism, a control mechanism, a power mechanism and a casing;

The coiled tubing transportation drag reduction device is installed in the annulus between the coiled tubing and casing/open hole well wall. When installed, it is lowered into the well along with the coiled tubing. When the drag reduction is working, it is anchored at the coiled tubing self-locking point. nearby;

The limiting mechanism is used to lock the coiled tubing by moving radially inward, and is lowered in/out together with the coiled tubing;

The drag reduction mechanism is used to convert the sliding friction between the coiled tubing and the casing/open hole wall into rolling friction;

The control mechanism is responsible for receiving ground signal instructions, controlling the limit mechanism to move radially inward or outward, and the inward movement locks the coiled tubing, and the outward movement blocks the casing/open hole wall;

The power mechanism is responsible for providing power for movement of the limiting mechanism;

The outer shell covers the limiting mechanism, drag reducing mechanism, control mechanism and power mechanism as a whole.

The limiting mechanism is arranged radially along the coiled tubing transportation drag reduction device, and its movement direction is to move radially inward or outward, and can be locked/unlocked according to demand after moving inward or outward to any position. Move radially outward to jam the casing/open hole wall, and at the same time release the coiled tubing, and anchor the coiled tubing transportation drag reduction device at a location where the downhole coiled tubing is prone to self-locking.

Both the inner and outer ends of the limiting mechanism are arranged with inverted teeth, and the tooth shapes of the inner and outer inverted teeth are inclined downward. The lower helical teeth on the inner side of the limiting mechanism help the coiled tubing transportation drag reduction device to lock when it is lifted out. The coiled tubing on the inside; the lower helical teeth on the outside of the limiting mechanism help the coiled tubing transportation drag reduction device to anchor the peripheral casing/open hole well wall to prevent displacement during auxiliary transportation.

The drag reduction mechanism is arranged on the inner wall surface of the coiled tubing transportation drag reduction device to reduce the coiled tubing transportation resistance. The drag reduction mechanism is a ball or a crawler, if and only if the coiled tubing transportation drag reduction device reaches the designated work It starts working after reaching the position (self-locking point). At this time, the drag reduction mechanism contacts the coiled tubing, converting the sliding friction between the coiled tubing and casing/open hole wall into rolling friction between the drag reduction mechanism and the coiled tubing.

The outer shell plays a supporting and fixing role.

The limiting mechanism includes claws 1-1 and main bevel gear plate 1-2;

The drag reducing mechanism includes a drag reducing bushing 2-1 and a drag reducing ball 2-2;

The control mechanism includes ground control equipment 3-1 and underground receiving device 3-2;

The power mechanism includes a motor 4-1 and a bevel gear 4-2;

The shell includes an upper shell 5-1 and a lower shell 5-2;

The motor 4-1 is installed at the axis of the bevel gear 4-2, and drives the bevel gear 4-2 to rotate forward or reverse through the forward and reverse rotation of the motor 4-1;

There are teeth below the main bevel gear plate 1-2, which mesh with the bevel gear 4-2. When the bevel gear 4-2 rotates forward or reverse, it drives the main bevel gear plate 1-2 to rotate forward or reverse, and the main bevel gear There is a spiral groove engraved on the top of the disk 1-2, which meshes with the groove below the claw 1-1, driving the claw 1-1 to move inward or outward;

The claws 1-1 are arranged above the main bevel gear plate 1-2, and several are arranged in the circumferential direction. There is a groove engraved below the claw 1-1, and the groove meshes with the spiral groove above the main bevel gear plate 1-2. , when the main bevel gear plate 1-2 rotates forward or reverse, it drives the claw 1-1 to move inward or outward;

The inner and outer sides of the claw 1-1 are provided with inverted teeth, and the directions of the inner and outer inverted teeth are inclined downward;

The drag reducing bushing 2-1 is arranged inside the main bevel gear plate 1-2. The drag reducing bushing 2-1 is an annular columnar structure, and a window is arranged on it for the claw 1-1 to pass when it moves inward. A hemispherical ball groove is arranged on the inside of the drag reduction bushing for inlaying the balls 2-2. The ball 2-2 is embedded in the ball groove inside the bushing 2-1. The diameter of the ball 2-2 ranges from 4 to 6 mm. The ball groove inside the bushing 2-1 is filled with lubricating oil;

The ground control mechanism 3-1 is set on the ground and is used to transmit action instructions. The underground receiving device 3-2 is set near the motor 4-1 and is used to receive ground instructions and control the action of the motor;

The upper housing 5-1 and the lower housing 5-2 are connected by bolts to achieve the fixation function of the entire mechanism. The upper housing 5-1 and the lower housing 5-2 are provided with reserved openings 5-3 as needed. , the reserved opening 5-3 is used for the claw 1-1 to pass outward and jam the well wall.

A method of using a coiled tubing transportation drag reduction device, including the following steps;

Step 1. Before running the coiled tubing (when it is on the ground), put the coiled tubing transportation drag reduction device around the end of the coiled tubing, and the limiting mechanism moves radially inward to lock the coiled tubing;

Step 2. During the coiled tubing running process, the limiting mechanism continues to lock the coiled tubing, and the coiled tubing transportation drag reduction device is lowered into the well along with the coiled tubing;

Step 3. When the coiled tubing transportation drag reduction device is lowered to the required depth, the limiting device moves outward, loosens the inner coiled tubing, and blocks the peripheral casing/open hole wall outwards;

Step 4: The coiled tubing transportation drag reduction device is anchored at the depth of the fixed well, and the sliding friction between the coiled tubing and the well wall is converted into rolling friction between the coiled tubing and the drag reduction device through the inner drag reduction device to achieve drag reduction. Function;

Step 5. When the coiled tubing is pulled out, the limiting mechanism moves radially inward, loosens the peripheral casing/open hole well wall, locks the inner coiled tubing, and the entire coiled tubing transportation drag reduction device is pulled out together with the coiled tubing;

Step 6. After the coiled tubing transportation drag reduction device reaches the ground, the limiting mechanism moves radially outward, loosens the coiled tubing on the inside, and then it can be disassembled from the coiled tubing and can be reused after cleaning.

Beneficial effects of the present invention:

The invention is lowered into the well along with the coiled tubing and is anchored near the self-locking point of the coiled tubing during operation. By converting the sliding friction between the coiled tubing and the casing/open hole wall into the friction between the drag reduction mechanism and the coiled tubing Rolling friction reduces the resistance of the coiled tubing when running in, and prevents the "self-locking phenomenon" of the coiled tubing during the running process.

Description of the drawings

Figure 1 is a schematic diagram (side view) of the main functional modules included in the present invention.

Figure 2 is a schematic diagram (top view) of the main functional modules included in the present invention.

Figure 3 is a schematic diagram of the preparation work before entering the well according to the present invention.

Figure 4 is a schematic diagram of the invention's operation in the well.

Figure 5 is a schematic diagram of the operation of the present invention when it reaches the working position point.

Figure 6 is a schematic diagram of the operation of the present invention in a drag reduction state.

Figure 7 is a schematic diagram of the operation in the recycling process of the present invention.

Figure 8 is a schematic diagram of the recovery to the ground operation of the present invention.

Figure 9 is a schematic diagram of the operation of the present invention when it is removed from the coiled tubing.

Figure 10 is a schematic cross-sectional structural diagram of a specific application case of the present invention.

Figure 11 is a schematic side view of the overall structure of a specific application case of the present invention.

Figure 12 is a schematic diagram of the claw extending and retracting states in a top view of a specific application case of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings.

A coiled tubing transportation drag reduction device installed in the annulus between the coiled tubing and casing/open hole well wall. During installation, it is lowered into the well along with the coiled tubing and anchored at the wellbore position where buckling and self-locking are most likely to occur; under drag reduction working conditions, rolling friction is used to allow the coiled tubing to pass through the self-locking point more smoothly, reducing buckling and self-locking. possibility of happening. This device can work at multiple different buckling self-locking points simultaneously.

Figure 1 is a schematic diagram of the main functional modules included in the present invention. As shown in Figure 1, the coiled tubing transportation drag reduction device includes five functional modules: a limiting mechanism 1, a drag reduction mechanism 2, a control mechanism 3, a power mechanism 4, and a housing 5.

The limiting mechanism 1 is arranged radially along the coiled tubing transportation drag reduction device, and its movement direction is to move radially inward or outward, and can be locked/unlocked according to needs after moving inward or outward to any position. Its function is to move radially inward to lock the coiled tubing, and run it in/out together with the coiled tubing; to move radially outward to block the casing/open hole wall, and at the same time release the coiled tubing to reduce the transportation of the coiled tubing. The blocking device is anchored at a location where the downhole coiled tubing is prone to self-locking. Both the inner and outer ends of the limiting mechanism are equipped with inverted teeth. The tooth shapes of the inner and outer inverted teeth are inclined downward. The lower helical teeth on the inner side of the limiting mechanism help to lock the inner part of the coiled tubing transportation drag reduction device when it is lifted out. Coiled tubing; the lower helical teeth on the outside of the limiting mechanism help the coiled tubing transportation drag reduction device to anchor the peripheral casing/open hole well wall to prevent displacement during auxiliary transportation.

The drag reduction mechanism 2 is arranged on the inner wall surface of the coiled tubing transportation drag reduction device. It is characterized by converting the sliding friction between the coiled tubing and the casing/open hole well wall into rolling friction to reduce the coiled tubing transportation resistance. The drag reducing mechanism may be balls or crawlers. When and only when the coiled tubing transportation drag reduction device reaches the designated working position (self-locking point), it starts to work. At this time, the drag reduction mechanism contacts the coiled tubing and reduces the sliding friction between the coiled tubing and the casing/open hole wall. Converted into rolling friction between the drag reduction mechanism and the coiled tubing.

The control mechanism 3 is responsible for receiving ground signal instructions and controlling the limit mechanism to move radially inward or outward. The inward movement locks the coiled tubing, and the outward movement blocks the casing/open hole wall.

The power mechanism 4 is responsible for providing the power for movement of the limiting mechanism.

The outer shell 5 plays a supporting and fixing role, and covers the limiting mechanism, arrowhead mechanism, control mechanism and power mechanism as a whole without affecting the functions of each part.

Figures 2 to 8 are schematic diagrams of the working process of the present invention.

The working process of the coiled tubing transportation drag reduction device is:

1. Before running the coiled tubing (when it is on the ground), put the coiled tubing transportation drag reduction device around the end of the coiled tubing, and the limiting mechanism moves radially inward to lock the coiled tubing. (image 3)

2. During the coiled tubing running process, the limiting mechanism continues to lock the coiled tubing, and the coiled tubing transportation drag reduction device is lowered into the well along with the coiled tubing. (Figure 4)

3. When the coiled tubing transportation drag reduction device is lowered to the required depth, the limiting device moves outward, loosens the inner coiled tubing, and blocks the peripheral casing/open hole wall outwards. (Figure 5)

4. The coiled tubing transportation drag reduction device is anchored at the depth of the fixed well. The sliding friction between the coiled tubing and the well wall is converted into rolling friction between the coiled tubing and the drag reduction device through the inner drag reduction device to achieve the drag reduction function. . (Figure 6)

5. When the coiled tubing is pulled out, the limiting mechanism moves radially inward, loosens the peripheral casing/open hole wall, locks the inner coiled tubing, and the entire coiled tubing transportation drag reduction device is pulled out together with the coiled tubing. (Figure 7)

6. After the coiled tubing transportation drag reduction device reaches the ground, the limiting mechanism moves radially outward, loosens the coiled tubing on the inside, and then it can be disassembled from the coiled tubing and can be reused after cleaning. (Figure 8, Figure 9)

The present invention will be further described in detail below with reference to application cases.

This application case includes five parts: limit mechanism 1, drag reduction mechanism 2, control mechanism 3, power mechanism 4, and housing 5.

The limiting mechanism 1 includes a claw 1-1 and a main bevel gear plate 1-2.

The drag reducing mechanism 2 includes a drag reducing bushing 2-1 and a drag reducing ball 2-2.

The control mechanism 3 includes surface control equipment 3-1 and an underground receiving device 3-2.

The power mechanism 4 includes a motor 4-1 and a bevel gear 4-2.

The housing 5 includes an upper housing 5-1 and a lower housing 5-2.

The motor 4-1 is installed at the axis center position of the bevel gear 4-2, and drives the bevel gear 4-2 to rotate forward or reversely through the forward and reverse rotation of the motor 4-1.

There are teeth below the main bevel gear plate 1-2, which mesh with the bevel gear 4-2. When the bevel gear 4-2 rotates forward or reverse, it will drive the main bevel gear plate 1-2 to rotate forward or reverse. A spiral groove is engraved on the top of the main bevel gear plate 1-2, which meshes with the groove below the claw 1-1 to drive the claw 1-1 to move inward or outward.

The claws 1-1 are arranged above the main bevel gear plate 1-2, and several of them are arranged in the circumferential direction. There is a slot engraved under the claw 1-1, which meshes with the spiral groove above the main bevel gear plate 1-2. When the main bevel gear plate 1-2 rotates forward or reverse, the claw 1-1 is driven to the direction of the main bevel gear plate 1-2. Move inward or outward, and hold the inner tubing tightly or jam the outer well wall according to the application needs.

Both the inner and outer sides of the claw 1-1 are provided with inverted teeth, and the directions of the inner and outer inverted teeth are inclined downward. When the claws hold the inner tubing and go down the well, once an obstacle is encountered, the downwardly inclined inverted teeth on the inside make it difficult for the coiled tubing transportation drag reduction device to slip and shift from the central pipe; when the claws hold the peripheral well wall, they are in a drag reduction position. During operation, the downwardly inclined inverted teeth on the periphery will lock the coiled tubing transportation drag reduction device, making it difficult for it to slide downwards and shift.

The drag reducing bushing 2-1 is arranged inside the main bevel gear plate 1-2. The drag reduction bushing 2-1 is an annular columnar structure, with a window arranged on it for the claw 1-1 to pass through when moving inward. A hemispherical ball groove is arranged on the inside of the drag reduction bushing for inlaying the balls 2-2. The ball 2-2 is embedded in the ball groove inside the bushing 2-1. The selection range of the diameter of the ball 2-2 is 4~6mm. The ball groove inside the bushing 2-1 is filled with lubricating oil. The lubricating oil fully contacts the balls under the continuous rolling of the balls, further reducing the rolling friction when the coiled tubing passes through the buckling point.

The ground control mechanism 3-1 is provided on the ground and is used for transmitting action instructions. The underground receiving device 3-2 is arranged near the motor 4-1 and is used to receive surface instructions and control the movement of the motor.

The upper housing 5-1 and the lower housing 5-2 are the upper and lower parts of the housing 5. The upper housing 5-1 and the lower housing 5-2 are connected by bolts to achieve the fixation of the overall mechanism. The upper housing 5-1 and the lower housing 5-2 are provided with reserved openings 5-3 as needed. The reserved openings 5-3 are used for the claws 1-1 to pass outward and block the well wall.

The working process of the coiled tubing transportation drag reduction device application case is:

1. Before running the coiled tubing (when it is on the ground), pass the coiled tubing through the reserved hole in the middle of the application case device. The control device 3-1 sends an electronic command to cause the motor 4-1 to rotate forward. The underground receiving device 3-2 receives the electronic command and controls the motor 4-1 to start forward rotation. The motor 4-1 rotates forward, driving the bevel gear shaft 4-2 to rotate clockwise, and the matching main bevel gear plate 1-2 rotates clockwise, and drives the claw 1- through the spiral groove on the surface of the main bevel gear plate 1-2. 1 moves inward and after locking the coiled tubing, the motor 4-1 stops rotating.

2. During the coiled tubing running process, the claws 1-1 continue to lock the coiled tubing, and the application case device is lowered into the well along with the coiled tubing.

3. When the coiled tubing transportation drag reduction device is lowered to the required depth, the ground control equipment 3-1 sends an electronic command to reverse the motor 4-1, and the downhole receiving device 3-2 receives the electronic command and controls the motor. 4-1 reversal. The motor 4-1 rotates reversely, driving the bevel gear 4-2 to rotate counterclockwise, and the matching main bevel gear plate 1-2 rotates counterclockwise, and drives the claw 1-1 through the spiral groove on the surface of the main bevel gear plate 1-2 After moving outward, loosening the coiled tubing and blocking the peripheral well wall, the motor 4-1 stops rotating.

4. During the drag reduction work of coiled tubing, the coiled tubing transportation drag reduction device is anchored at the specified depth position, and the sliding friction between the coiled tubing and the well wall is converted into friction between the coiled tubing and the drag reduction device through the inner ball 2-2 rolling friction between the wheels to achieve the drag reduction function.

5. When the coiled tubing is pulled out, the surface control equipment 3-1 sends an electronic command for the motor 4-1 to rotate forward, and the downhole receiving device 3-2 receives the electronic command and controls the motor 4-1 to rotate forward. The motor 4-1 rotates forward, driving the bevel gear 4-2 to rotate clockwise, and the matching main bevel gear plate 1-2 rotates clockwise, and drives the claw 1-1 through the spiral groove on the surface of the main bevel gear plate 1-2 After moving inward, loosening the peripheral well wall and holding the coiled tubing tightly, the motor 4-1 stops rotating. The application example device is pulled out together with the coiled tubing.

6. After the coiled tubing transportation drag reduction device reaches the surface, the ground control equipment 3-1 sends an electronic command to reverse the motor 4-1, and the downhole receiving device 3-2 receives the electronic command and controls the motor 4-1 to reverse. The motor 4-1 rotates reversely, driving the bevel gear 4-2 to rotate counterclockwise, and the matching main bevel gear plate 1-2 rotates counterclockwise, and drives the claw 1-1 through the spiral groove on the surface of the main bevel gear plate 1-2 After moving outward and loosening the coiled tubing, motor 4-1 stops. The application case device is disassembled from the coiled tubing and cleaned for reuse.

Claims (6)

1. The coiled tubing conveying damping device is characterized by comprising a limiting mechanism, a damping mechanism, a control mechanism, a power mechanism and a shell;

the coiled tubing conveying damping device is arranged in an annulus between the coiled tubing and a casing/open hole well wall, and is put into the well along with the coiled tubing during installation, and is anchored near a self-locking point of the coiled tubing in a damping working state;

the limiting mechanism is used for locking the coiled tubing along the radial inward movement and is used for being put in/out together with the coiled tubing;

the drag reduction mechanism is used for converting sliding friction between the coiled tubing and the casing/open hole wall into rolling friction;

the control mechanism is responsible for receiving ground signal instructions, controlling the limiting mechanism to move radially inwards or outwards, locking the coiled tubing by the inwards movement, and locking the casing/open hole wall by the outwards movement;

the power mechanism is responsible for providing power for the movement of the limiting mechanism;

the shell wraps the limiting mechanism, the drag reduction mechanism, the control mechanism and the power mechanism into a whole;

the drag reduction mechanism is arranged on the inner side wall surface of the coiled tubing conveying drag reduction device, so that the conveying resistance of the coiled tubing is reduced, the drag reduction mechanism is a ball or a track, and starts to work if and only after the coiled tubing conveying drag reduction device reaches a specified working position, and at the moment, the drag reduction mechanism is contacted with the coiled tubing, so that sliding friction between the coiled tubing and a casing/naked-eye well wall is converted into rolling friction between the drag reduction mechanism and the coiled tubing.

2. The coiled tubing conveying drag reducer of claim 1, wherein the limiting mechanism is radially arranged along the coiled tubing conveying drag reducer, the movement direction of the limiting mechanism is along radial inward or outward movement, the limiting mechanism can be locked/unlocked according to requirements after the limiting mechanism moves inward or outward to any position, the limiting mechanism can be used for clamping a casing/naked eye well wall along the radial outward movement, meanwhile, the coiled tubing is released, and the coiled tubing conveying drag reducer is anchored at a position where self-locking of the underground coiled tubing is easy to occur.

3. The coiled tubing conveying drag reducing device according to claim 1, wherein the inner side end part and the outer side end part of the limiting mechanism are respectively provided with inverted teeth, the tooth shapes of the inverted teeth on the inner side and the inverted teeth on the outer side are downward inclined, and the lower inclined teeth on the inner side of the limiting mechanism are beneficial to locking the inner side of the coiled tubing when the coiled tubing conveying drag reducing device is lifted out; and the lower helical teeth on the outer side of the limiting mechanism are helpful for the coiled tubing to convey the damping device to anchor the peripheral casing/open hole well wall during auxiliary conveying, so that displacement is prevented.

4. The coiled tubing conveyed drag reducing device of claim 1, wherein said housing is supported and stationary.

5. A coiled tubing transportation drag reducing device according to claim 1, wherein the limiting mechanism comprises a claw (1-1) and a main bevel gear disk (1-2);

the drag reduction mechanism comprises a drag reduction bushing (2-1) and drag reduction balls (2-2);

the control mechanism comprises surface control equipment (3-1) and a downhole receiving device (3-2);

the power mechanism comprises a motor (4-1) and a bevel gear (4-2);

the shell comprises an upper shell (5-1) and a lower shell (5-2);

the motor (4-1) is arranged at the axial center of the bevel gear (4-2), and the bevel gear (4-2) is driven to rotate forwards or reversely by the forward and reverse rotation of the motor (4-1);

the lower part of the main bevel gear disk (1-2) is provided with teeth which are meshed with the bevel gear (4-2), when the bevel gear (4-2) rotates forwards or reversely, the main bevel gear disk (1-2) is driven to rotate forwards or reversely, a spiral groove is carved on the upper part of the main bevel gear disk (1-2) and is meshed with a clamping groove below the clamping jaw (1-1), and the clamping jaw (1-1) is driven to move inwards or outwards;

the clamping jaws (1-1) are arranged above the main bevel gear disc (1-2) and are circumferentially arranged in a plurality of ways, clamping grooves are engraved below the clamping jaws (1-1) and meshed with spiral grooves above the main bevel gear disc (1-2), and the clamping jaws (1-1) are driven to move inwards or outwards when the main bevel gear disc (1-2) rotates forwards or backwards;

the inner side and the outer side of the claw (1-1) are respectively provided with a pawl, and the directions of the inner side and the outer side of the pawl are downward inclined;

the drag reduction bush (2-1) is arranged on the inner side of the main bevel gear disc (1-2), the drag reduction bush (2-1) is of an annular columnar structure, a window is arranged on the drag reduction bush, the claw (1-1) moves inwards and passes through the window, a hemispherical ball groove is arranged on the inner side of the drag reduction bush and is used for embedding balls (2-2), the balls (2-2) are embedded in the ball groove on the inner side of the bush (2-1), the diameter selection range of the balls (2-2) is 4-6 mm, and lubricating oil is filled in the ball groove on the inner side of the bush (2-1);

the ground control equipment (3-1) is arranged on the ground and used for transmitting action instructions, and the underground receiving device (3-2) is arranged near the motor (4-1) and used for receiving the ground instructions and controlling the motor to act;

the upper shell (5-1) is connected with the lower shell (5-2) through bolts, the fixing effect of the integral mechanism is achieved, a reserved opening (5-3) is formed in the upper shell (5-1) and the lower shell (5-2) according to requirements, and the reserved opening (5-3) is used for the outward passing of the clamping jaw (1-1) and clamping the well wall.

6. A method of using a coiled tubing conveyed drag reducing device according to any of claims 1-5, comprising the steps of;

step 1, before the continuous oil pipe is put down, a continuous oil pipe conveying drag reduction device is sleeved on the periphery of the end part of the continuous oil pipe, and a limiting mechanism moves inwards along the radial direction to lock the continuous oil pipe;

step 2, continuously locking the coiled tubing by a limiting mechanism in the process of the running of the coiled tubing, and running the coiled tubing conveying drag reduction device into a well along with the coiled tubing;

step 3, when the coiled tubing conveying drag reduction device is placed in a required depth position, the limiting device moves outwards, the coiled tubing on the inner side is loosened, and the peripheral casing pipe/open hole well wall is clamped outwards;

step 4, anchoring the coiled tubing conveying damping device in the depth of the fixed well, and converting sliding friction between the coiled tubing and the well wall into rolling friction between the coiled tubing and the damping device through the inner damping device to realize a damping function;

step 5, when the continuous oil pipe is lifted out, the limiting mechanism moves inwards along the radial direction, the peripheral sleeve pipe/naked eye well wall is loosened, the continuous oil pipe on the inner side is locked, and the whole continuous oil pipe conveying drag reduction device is lifted out together with the continuous oil pipe;

and 6, after the coiled tubing conveying drag reducing device reaches the ground, the limiting mechanism moves outwards along the radial direction, and the inner coiled tubing is loosened, so that the coiled tubing can be detached from the coiled tubing and can be reused after being cleaned.