CN114922581A - Underground casing continuous hole forming device and working method thereof - Google Patents

Abstract

The invention discloses a continuous drilling device for downhole casing and a working method thereof, comprising a flow distribution mechanism, a clamping mechanism and a cutting mechanism. The flow distribution mechanism is composed of an upper flow distribution plate, a flow distribution wall and a lower flow distribution plate. The mechanism is composed of a clamping block, a supporting leg, a supporting leg return spring and a supporting leg clamp, and the cutting mechanism is composed of an impeller, a drill bit, an impeller return spring, an impeller push plate and an impeller clamp. The invention can effectively reduce the downhole operation risk of the existing perforating projectile perforation, increase the number of holes and the quality of hole formation, reduce the requirements for required supporting equipment, and expand the operation range. Water influence can achieve precise positioning and drilling, with little impact on casing, multiple holes are formed in a single downhole, and can be used together with other downhole tools to increase oil and gas production.

Description

A device for continuous drilling of downhole casing and its working method

technical field

The invention relates to the technical field of supporting devices for oil and gas production in the process of shale gas and shale oil exploitation, in particular to a continuous hole-opening device for downhole casings and a working method thereof.

Background technique

During the exploitation of shale gas and shale oil resources, the oil and gas reservoir and the production pipe are separated by casing after drilling and cementing of the oil and gas well. The casing must be penetrated by perforating technology, and it can pass through the wellbore after perforation. The high pressure liquid and solid proppant are transported to fract the oil and gas reservoir, and then the oil and gas resources stored in the formation are released, and the released oil and gas resources enter the wellbore through the hole, and finally the oil and gas are extracted through the lifting process. At present, perforating guns are mostly used in downhole perforation. During the construction process, it is found that the perforating charges will have a great impact on the casing wall around the hole, which has a great impact on the later fracturing and other construction. In response to the above problems, the industry has also proposed to perforate mechanically, but at present, mechanical perforation is mostly extruded, resulting in poor perforation quality and easy deformation of the casing. Based on this, the present invention proposes a cutting-type downhole casing continuous drilling device. The cutting-type drilling method has good hole quality and is hardly affected by the downhole water. Through the structural design, it can realize precise positioning and drilling, and can be driven down multiple times in a single time. Holes and can be used with other downhole tools.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, provide a continuous hole drilling device for downhole casing and its working method, improve the number of holes and the quality of hole formation, reduce the requirements for supporting equipment, and expand the scope of operation.

The object of the present invention is achieved in this way:

A continuous drilling device for downhole casing,

It includes an upper shell, a motor bracket is fixed inside the upper shell, a rotating motor is installed in the motor bracket, the rotating motor and the upper shell are kept coaxially fixed, and a flow channel is arranged inside the motor bracket for the liquid to pass through, The lower part of the upper casing is axially provided with a rotating support, the middle part of the rotating support is connected with a rotating motor through a key, the rotating support is connected with the punching assembly, and the rotating motor drives the punching assembly to rotate through the rotating support;

The punching assembly includes a lower casing, the upper outer wall of the lower casing and the lower inner wall of the upper casing are axially fixed by balls, the rotating bracket is a frame structure, which connects the upper casing and the lower casing, and a flow distribution mechanism is arranged inside the lower casing , clamping mechanism and cutting mechanism;

The flow distribution mechanism includes an upper flow distribution plate, a flow distribution wall and a lower flow distribution plate. The upper flow distribution plate is connected to the upper flow distribution motor by a key. The motor is fixed inside the lower casing through the upper distribution motor bracket, the distribution wall is fixed inside the lower casing, the lower distribution plate is connected with the lower distribution motor through a key, and the lower distribution plate can be driven by the lower distribution motor. The lower current distribution motor is fixed inside the lower casing through the lower current distribution motor bracket;

An upper flow channel is arranged inside the upper flow distribution plate, a communication flow channel, a cutting installation hole, a flushing flow channel, a lower communication flow channel, a clamping flow channel and a pushing cavity are arranged inside the flow distribution wall, and the lower flow distribution plate is provided with There is a lower arc-shaped flow channel, the upper flow distribution plate can control the upper flow channel inside the upper flow distribution plate to communicate with the flushing flow channel or the clamping flow channel inside the flow distribution wall under the action of the upper flow distribution motor, and the lower flow distribution plate can be connected to the lower flow distribution motor. Under the action, the lower arc-shaped flow channel inside the lower distribution plate is controlled to be communicated with the lower communication channel in the distribution wall separately, or the lower arc-shaped flow channel in the lower distribution plate is connected with the lower communication channel in the distribution wall and the lower end of the clamping flow channel together. connected, or, the lower arc-shaped flow channel in the lower distribution plate is not connected with all the flow channels in the distribution wall, so as to control the operation of the device;

The number of the clamping flow passages is two, the two clamping flow passages are arranged on the outer wall of the distribution wall along the axial direction, and are symmetrically arranged, and the two clamping flow passages are communicated through the communication flow passage, and the communication flow passage is in the flow distribution. The wall is evenly provided with a plurality of, one of the two clamping flow channels is closed at both ends, and the other is a through groove, which is used to communicate with the upper flow distribution plate/lower flow distribution plate;

The clamping mechanism includes a clamping block, a supporting leg, a supporting leg return spring and a supporting leg clamp, the outer wall of the lower casing is provided with a cavity that is clearance-fitted with the clamping block, and the cavity is connected to the clamping flow. The fluid can push the clamping block radially out through the cavity, the support leg is fixed on the clamping block, and is clearance fit with the lower shell, and the support leg clamp is clamped to the groove at the end of the support leg Inside, the support leg return spring is sleeved on the support leg, and is located between the lower shell and the support leg clamp, the number of the clamping mechanisms is multiple, and the corresponding two clamping flow channels are symmetrically distributed;

The cutting mechanism includes an impeller, a drill bit, an impeller return spring, an impeller push plate and an impeller clamp. The drill bit is slidably matched with the flow distribution wall. The impeller is installed on the front end of the drill bit through a sliding key. The impeller push plate is connected, the impeller push plate is slidably fitted inside the cutting installation hole, the impeller return spring is sleeved at the rear end of the drill bit, and is located between the impeller push plate and the step of the cutting installation hole, the impeller clamp is installed Inside the cutting installation hole of the distribution wall, it is used to limit the limit position of the impeller push plate;

The impeller is installed in the rotating cavity provided inside the distribution wall, and the rotating cavity is communicated with the swirl flow channel, and the fluid can enter the rotating cavity through the swirl flow channel inside the distribution wall to impact the impeller for rotation. The upper end of the swirl flow channel is provided with a transverse groove. , the transverse groove is communicated with the upper end of the pushing cavity, therefore, the fluid can enter the pushing cavity while the impeller rotates. Used to apply thrust to the impeller push plate to extend the drill bit.

Preferably, the upper end of the lower casing is closed, and the rest of the lower casing has the same diameter as the upper casing.

Preferably, the motor bracket, the upper distribution motor bracket, the distribution wall, and the lower distribution motor bracket are respectively fixed by locking screws.

Preferably, the rotating bracket is fixed on the inner wall of the upper end of the lower casing by means of threads.

Preferably, the upper end of the rotating cavity is a nozzle, and the lower end is a discharge port, a jet is formed in the rotating cavity, and the fluid will form a high pressure relative to the rotating cavity in the pushing cavity.

A working method of a downhole casing continuous opening device,

First of all, the lower flow distribution plate is not connected with the internal flow channel of the flow distribution wall. At this time, the upper flow channel inside the upper flow distribution plate is connected with the clamping flow channel inside the flow distribution wall. At this time, the fluid enters the clamping flow channel, and the connection is realized through the communication flow channel. The tightening block protrudes and fits with the inner wall of the casing to realize clamping;

The upper distributing motor controls the upper flow passage inside the upper distributing plate to communicate with the flushing flow passage inside the distributing wall. At this time, the fluid enters the flushing flow passage and pushes the cavity, and the fluid enters the rotating cavity through the flushing flow passage of the distributing wall. The impeller rotates and the impeller torque is transmitted. At the same time, under the action of the pressure of the push chamber, a pressure difference is generated on both sides of the impeller push plate, and the generated thrust is directly transmitted to the rear end of the drill bit, and the drill bit cuts the casing under the action of thrust and torque;

After the cutting is completed, the lower flow distribution plate rotates under the action of the lower flow distribution motor, and the lower arc-shaped flow channel is first connected with the communication flow channel under the flow distribution wall. At this time, the pressure is instantly relieved, the speed of the drill bit decreases, and the pressure of the driving cavity is reduced. Down, the drill bit retracts, at this time the lower distribution plate is under the action of the lower distribution motor, and the lower arc-shaped flow channel is connected with the lower communication channel and the flushing flow channel of the distribution wall at the same time, the clamping flow channel pressure drops, under the action of the support return spring , the support legs are retracted to complete a casing opening.

Preferably, the upper rotating motor rotates to drive the entire punching assembly to rotate by a set angle, and repeat the previous casing drilling process to realize continuous circumferential drilling of the casing.

Preferably, an up and down moving tool is also included, and the up and down moving tool drives the upper casing 1 to move up and down to realize the axial opening of the casing.

Owing to adopting the above-mentioned technical scheme, the present invention has the following beneficial effects:

Using the continuous hole drilling device for downhole casing provided by the present invention can effectively reduce the risk of downhole operation of the existing perforating projectile perforation, improve the number of holes and the quality of hole formation, reduce the requirements for required supporting equipment, and expand the scope of operation. The present invention proposes The downhole casing cutting drilling method has good hole quality and is hardly affected by the downhole water. Through the structural design, precise positioning and drilling can be realized, and the punching has little effect on the casing. Used in conjunction with other downhole tools to achieve oil and gas stimulation.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the schematic diagram of the flow channel of the distribution mechanism of the present invention;

3 is a schematic diagram of the clamping mechanism (clamping, loosening) of the present invention;

FIG. 4 is a schematic diagram of the cutting mechanism (extension and retraction) of the present invention;

Figure 5 is a sectional view of the impeller flow channel of the present invention.

Detailed ways

The present invention will be further described below with reference to examples and accompanying drawings.

Referring to Figures 1 to 5, a device for continuous drilling of downhole casing includes an upper casing 1, a rotating motor 4, a motor bracket 3 and a locking screw 2 are arranged inside the upper casing 1, and the upper casing 1 is axially arranged There is a punching assembly, and a rotating bracket 5 is arranged inside the punching assembly.

The rotating motor 4 is fixed inside the motor support 3, the motor support 3 is fixed inside the upper casing 1 by the locking screw 2, the punching assembly and the upper casing 1 are axially fixed by the ball 7, the rotating support 5 is fixed above the punching assembly through threads, and the middle of the rotating bracket 5 is connected to the rotating motor 4 through a key 6 .

The position of the rotating motor 4 and the upper casing 1 is kept fixed. The motor bracket 3 is provided with a flow channel 3 a. The rotating motor 4 can drive the punching assembly to rotate by a certain angle through the rotating bracket 5 .

The punching assembly includes a lower casing 9 , which is provided with a flow distribution mechanism A, a clamping mechanism B and a cutting mechanism C. The flow distribution mechanism A consists of an upper flow distribution plate 10 , a flow distribution wall 14 and a lower flow distribution plate 15 .

The upper distribution plate 10 is connected with the upper distribution motor 42 through the key 62, the upper distribution plate 10 can be driven by the upper distribution motor 42 to do circumferential rotation, and the upper distribution motor 42 passes through the motor bracket 32 and the locking screw 22. It is fixed inside the lower casing 9 , the distribution wall 14 is fixed inside the lower casing 9 through the locking screw 23 , the lower distribution plate 15 is connected with the lower distribution motor 43 through the key 63 , and the lower distribution plate 15 can be connected to the lower distribution motor 43 . Driven to rotate in the circumferential direction, the lower distribution motor 43 is fixed inside the lower casing 9 through the motor bracket 33 and the locking screw 24 .

The upper flow distribution plate 10 is provided with a flow channel 10a inside, and the flow distribution wall 14 is provided with a communication flow channel 14a, a cutting installation hole 14b, a flushing flow channel 14c, a lower communication flow channel 14d, a clamping flow channel 14e and a push flow channel 14c. Cavity 14t, the lower distribution plate 15 is provided with a lower arc-shaped flow channel 15a, and the upper distribution plate 10 can control the inner flow channel 10a of the upper distribution plate 10 and the inner flow channel of the distribution wall 14 under the action of the upper distribution motor 42. 14c or the clamping flow channel 14e is connected, and the lower flow distribution plate 15 can be controlled by the lower flow distribution motor 43 to control the lower arc-shaped flow channel 15a inside the lower flow distribution plate 15 and the lower communication flow channel 14d inside the flow distribution wall 14 to be communicated individually, or, The lower arc-shaped flow channel 15a inside the lower distribution plate 15 is in communication with the lower communication channel 14d inside the distribution wall 14 and the lower end of the clamping flow channel 14e, The runners are not connected, and the control device operates.

The number of the clamping flow passages 14e is two, the two clamping flow passages 14e are arranged on the outer wall of the distribution wall 14 in the axial direction, and are symmetrically arranged, and the two clamping flow passages 14e are communicated through the communicating flow passages 14a, A plurality of communication channels 14a are evenly arranged on the distribution wall 14, one of the two clamping channels 14e is closed at both ends, and the other is a through groove for communicating with the distribution plate.

The clamping mechanism B is composed of a clamping block, a support leg 11 , a support leg return spring 12 and a support leg clamp 13 .

The clamping block is installed outside the lower casing 9 , the supporting legs 11 are in clearance fit with the lower casing 9 , and the supporting leg return springs 12 are sleeved on the supporting legs 11 and located between the lower casing 9 and the supporting leg clamps 13 . In between, the support leg clamp 13 is installed in the special groove of the support leg 11 .

The outer wall of the lower casing 9 is provided with a cavity 9a that is clearance fit with the clamping block, the cavity 9a communicates with the clamping flow channel 14e, and the fluid can push the clamping block to radially extend through the cavity 9a.

The number of the clamping mechanisms B is multiple, which are symmetrically distributed corresponding to the two clamping flow channels 14e.

The cutting mechanism C is composed of an impeller 16 , a drill bit 17 , an impeller return spring 18 , an impeller push plate 19 and an impeller clamp 20 .

The impeller 16 is installed on the outside of the drill bit 17 through the sliding key 602, the drill bit 17 is connected with the impeller push plate 19 through threads, the impeller push plate 19 is clearance fit inside the cutting installation hole 14b, and the impeller return spring 18 is installed Between the impeller push plate 19 and the step of the cutting installation hole 14 b , the impeller clamp 20 is installed inside the cutting installation hole 14 b of the flow distribution wall 14 to limit the limit position of the impeller push plate 19 .

The number of the cutting mechanisms C is multiple, which are evenly distributed corresponding to one pushing cavity 14t, and the pushing cavity 14t communicates with the cutting installation hole 14b.

The impeller 16 is installed in the rotating cavity 14r inside the distribution wall 14, and the rotating cavity 14r communicates with the swirl flow channel 14c. The fluid can enter the rotating cavity 14r through the swirl flow channel 14c inside the distribution wall 14 to impact the impeller and rotate. The upper end of the channel 14c is provided with a transverse groove, which communicates with the upper end of the pushing chamber 14t. Therefore, while the impeller rotates, the fluid can enter the pushing chamber 14t, because the upper end of the punching channel is provided with a nozzle, and the fluid passes through the nozzle to form a joint. The upper end of the nozzle is the high-pressure area, which is connected to the push chamber, and the lower end of the nozzle is the low-pressure area, but the fluid velocity will increase, forming a jet, the pressure of the rotating chamber 14r is small, and the pressure of the push chamber 14t pushes the impeller push plate 19 to move radially , so that the drill bit 17 is extended.

The impellers are arranged in series, and the energy gradually decreases from top to bottom. When the opening position at the upper end of the casing is penetrated, the cutting reaction torque of the drill bit drops instantly. At this time, the fluid energy consumed by the upper impeller decreases, and most of the fluid energy will be directly It is transmitted to the next impeller to achieve single clamping and multiple holes in the axial direction.

work method:

First, the lower flow distribution plate is not connected with the internal flow channel of the flow distribution wall. At this time, the internal flow channel 10a of the upper flow distribution plate is connected with the internal clamping flow channel 14e of the flow distribution wall. At this time, the fluid enters the clamping mechanism, and the left and right through the communication flow channel 14a is realized. , the clamping block protrudes and cooperates with the inner wall of the casing to realize clamping. At this time, the upper distributing motor controls the internal flow channel 10a of the upper distributing plate to communicate with the flushing flow channel 14c inside the distributing wall. At this time, the fluid enters the inside of the cutting mechanism, and the upper horizontal groove of the flushing flow channel 14c realizes the left and right connection with the pushing cavity 14t. It can enter the rotating chamber 14r through the distributing wall and turn the flow channel 14c to impact the impeller for rotation. As shown in FIG. 5 , the upper end of the rotating chamber 14r is a nozzle, and the lower end is a discharge port. A jet is formed. Under the action of the jet, the impeller rotates, and its torque is transmitted to the drill bit through the key. Under the action of the push chamber 14t, a pressure difference is generated on both sides of the impeller push plate, and the generated thrust is directly transmitted to the rear end of the drill bit. The casing is cut under the action of torque. After the cutting is completed, the lower arc-shaped flow channel 15a is first connected to the lower communication channel 14d of the flow distribution wall under the action of the lower flow distribution motor after the cutting is completed. When the pressure decreases, the drill bit retracts under the action of the drill bit return spring. At this time, under the action of the lower flow distribution motor, the lower arc-shaped flow channel 15a is connected with the lower communication flow channel 14d and the flushing flow channel 14c at the same time, and the clamping The pressure of the flow channel 14e drops. Under the action of the support return spring, the support leg retracts. At this time, the rotating motor can rotate to drive the entire punching assembly to rotate at a certain angle, and then the inner flow channel 10a of the upper flow distribution plate and the inside of the flow distribution wall clamp the flow The channel 14e is connected, and the lower flow distribution plate and the inner flow channel of the distribution wall are closed. At this time, the fluid enters the clamping mechanism again, and the above process is cycled again, and the hole is formed again. After the circumferential hole is formed, the drill bit and the support leg are retracted. Under the action of other downhole tools (moving up and down tools), the continuous opening device moves up and down together, thereby realizing one downhole and multiple holes.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should Various changes may be made in details without departing from the scope of the invention as defined by the claims.

Claims (8)

1. a continuous drilling device for downhole casing is characterized in that: It comprises an upper casing (1), a motor bracket (3) is fixed inside the upper casing (1), a rotating motor (4) is installed in the motor bracket (3), and the rotating motor (4) is connected to the upper casing ( 1) The position is kept coaxially fixed, the motor bracket (3) is provided with a flow channel (3a) for the liquid to pass through, and the lower part of the upper casing (1) is axially provided with a rotating support (5), the rotating support (5) The middle part is connected with the rotating motor (4) through the key (6), the rotating bracket (5) is connected with the punching assembly, and the rotating motor (4) drives the punching assembly to rotate through the rotating bracket (5); The punching assembly comprises a lower casing (9), the upper outer wall of the lower casing (9) and the lower inner wall of the upper casing (1) are axially fixed by balls (7), and the rotating support (5) is a frame structure, The upper casing (1) and the lower casing (9) are communicated, and the lower casing (9) is provided with a flow distribution mechanism (A), a clamping mechanism (B) and a cutting mechanism (C); The distribution mechanism (A) comprises an upper distribution plate (10), a distribution wall (14) and a lower distribution plate (15), and the upper distribution plate (10) is connected to the upper distribution motor (42) through a key (62), The upper flow distribution plate (10) can be rotated in the circumferential direction under the driving of the upper flow distribution motor (42), and the upper flow distribution motor (42) is fixed inside the lower casing (9) through the upper flow distribution motor bracket (32). The wall (14) is fixed inside the lower casing (9), the lower distribution plate (15) is connected with the lower distribution motor (43) through a key (63), and the lower distribution plate (15) can be connected to the lower distribution motor (43) The lower distribution motor (43) is driven to rotate in the circumferential direction, and the lower distribution motor (43) is fixed inside the lower casing (9) through the lower distribution motor bracket (33); An upper flow channel (10a) is arranged inside the upper flow distribution plate (10), and a communication flow channel (14a), a cutting installation hole (14b), a flushing flow channel (14c), a lower flow channel (14c) and a lower flow channel (14c) are arranged inside the flow distribution wall (14). Connecting the flow channel (14d), the clamping flow channel (14e) and the pushing cavity (14t), the lower distribution plate (15) is provided with a lower arc-shaped flow channel (15a), and the upper distribution plate (10) can be The upper flow channel (10a) inside the upper flow distribution plate (10) is controlled to communicate with the internal flush flow channel (14c) or the clamping flow channel (14e) of the flow distribution wall (14) under the action of the upper flow distribution motor (42). (15) Under the action of the lower distribution motor (43), the lower arc-shaped flow channel (15a) inside the lower distribution plate (15) can be controlled to communicate with the lower communication flow channel (14d) inside the distribution wall (14) independently, or, the lower flow distribution The inner lower arc-shaped flow channel (15a) of the disc (15) is communicated with the inner lower communication channel (14d) of the distribution wall (14) and the lower end of the clamping flow channel (14e) together, or, the inner lower arc of the lower distribution plate (15) The shape flow channel (15a) is not communicated with all the flow channels inside the distribution wall (14), so as to control the operation of the device; The number of the clamping flow passages (14e) is two, the two clamping flow passages (14e) are axially arranged on the outer wall of the distribution wall (14) and are symmetrically arranged, and the two clamping flow passages (14e) ) is communicated through a communication channel (14a), and a plurality of communication channels (14a) are evenly arranged on the distribution wall (14), one of the two clamping channels (14e) is closed at both ends, and the other is a through groove, For communicating with the upper distribution plate (10)/lower distribution plate (15); The clamping mechanism (B) includes a clamping block, a supporting leg (11), a supporting leg return spring (12) and a supporting leg clamp (13), and the outer wall of the lower casing (9) is provided with a clamping ring. The cavity (9a) for the clearance fit of the block, the cavity (9a) communicates with the clamping flow channel (14e), the fluid can push the clamping block radially out through the cavity (9a), and the support legs (11) ) is fixed on the clamping block and is clearance fit with the lower casing (9), the support leg clamp (13) is clamped in the groove at the end of the support leg (11), the support leg return spring (12) ) is sleeved on the support leg (11), and is located between the lower shell (9) and the support leg clamp (13), the number of the clamping mechanisms (B) is multiple, and corresponds to two clamping flow channels (14e) symmetrical distribution; The cutting mechanism (C) includes an impeller (16), a drill bit (17), an impeller return spring (18), an impeller push plate (19) and an impeller clamp (20). 14) Sliding fit, the impeller (16) is installed on the front end of the drill bit (17) through a feather key (602), and the rear end of the drill bit (17) is connected to the impeller push plate (19) through threads, and the impeller push plate ( 19) Slidingly fit inside the cutting installation hole (14b), the impeller return spring (18) is sleeved on the rear end of the drill bit (17), and is located between the impeller push plate (19) and the step of the cutting installation hole (14b) , the impeller clamp (20) is installed inside the cutting installation hole (14b) of the flow distribution wall (14), for limiting the limit position of the impeller push plate (19); The impeller (16) is installed in a rotating cavity (14r) provided inside the distributing wall (14), the rotating cavity (14r) is communicated with the flushing flow channel (14c), and the fluid can pass through the internal flushing flow channel (14) of the distributing wall (14). (14c) enters the rotating cavity (14r) to impinge the impeller for rotation, the upper end of the impingement flow channel (14c) is provided with a transverse groove, and the transverse groove communicates with the upper end of the impelling cavity (14t). The fluid can enter the pushing cavity (14t), the number of the cutting mechanisms (C) is multiple, the corresponding pushing cavity (14t) is evenly distributed, and the pushing cavity (14t) is communicated with the cutting installation hole (14b) for pushing the impeller toward the impeller The plate (19) exerts a thrust to extend the drill bit (17). 2. A continuous hole drilling device for downhole casing according to claim 1, characterized in that: the upper end of the lower casing (9) is closed, and the rest of the lower casing (9) has the same diameter as the upper casing (1). . 3. A continuous hole drilling device for downhole casing according to claim 1, characterized in that: the motor bracket (3), the upper distribution motor bracket (32), the distribution wall (14), the lower distribution motor bracket ( 33) Fix them by locking screws respectively. 4 . The device for continuous drilling of downhole casing according to claim 1 , wherein the rotating support ( 5 ) is fixed to the inner wall of the upper end of the lower casing ( 9 ) through threads. 5 . 5. A continuous hole drilling device for downhole casing according to claim 1, characterized in that: the upper end of the rotating cavity (14r) is a nozzle, the lower end is a discharge port, and the fluid is formed in the rotating cavity (14r) At the same time, the fluid will form a high pressure in the pushing chamber (14t) relative to the rotating chamber (14r). 6. A working method of the downhole casing continuous drilling device according to claim 1, characterized in that: First, the lower flow distribution plate is not connected to the internal flow channel of the flow distribution wall. At this time, the upper flow channel (10a) inside the upper flow distribution plate is communicated with the clamping flow channel (14e) inside the distribution wall, and the fluid enters the clamping flow channel (14e) at this time. , through the communication channel (14a), the clamping block protrudes under the action of fluid pressure, and fits with the inner wall of the casing to realize clamping; The upper distribution motor controls the upper flow channel (10a) inside the upper distribution plate to communicate with the flushing flow channel (14c) inside the distribution wall. At this time, the fluid enters the flushing flow channel (14c) and pushes the cavity (14t), and the fluid rushes through the distribution wall. The flow channel (14c) enters the rotating cavity (14r) to impact the impeller for rotation, and the torque of the impeller is transmitted to the drill bit. At the same time, under the action of the pressure of the pushing cavity (14t), a pressure difference is generated on both sides of the impeller push plate, and the generated thrust is directly transmitted to the At the rear end of the drill bit, the drill bit cuts the casing under the action of thrust and torque; After the cutting is completed, the lower flow distribution plate rotates under the action of the lower flow distribution motor, and the lower arc-shaped flow channel (15a) is first connected to the lower communication flow channel (14d) of the flow distribution wall. At this time, the pressure is instantly relieved, the speed of the drill bit decreases, and the cavity (14t) is pushed. When the pressure decreases, the drill bit retracts under the action of the drill bit return spring. At this time, under the action of the lower flow distribution motor, the lower arc-shaped flow channel (15a) communicates with the flow channel (14d) and the swivel flow channel (14c) under the flow distribution wall. ) are connected at the same time, the pressure of the clamping flow channel (14e) drops, and under the action of the support return spring, the support legs are retracted to complete a casing opening. 7. The working method of a continuous drilling device for downhole casing according to claim 6, characterized in that: the upper rotating motor rotates to drive the entire drilling assembly to rotate by a set angle, and the previous casing drilling process is repeated, Realize the continuous opening of the casing in the circumferential direction. 8 . The working method of a continuous hole drilling device for downhole casing according to claim 7 , further comprising an up-down moving tool, and the up-down moving tool drives the upper casing (1) to move up and down to realize the casing shaft. 9 . Continuously drill holes into the segment.

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