CN111236872A - A directional wireline core drilling tool and its drilling method - Google Patents

Abstract

The invention discloses a directional rope core drilling tool and a drilling method thereof. The drilling tool comprises an outer pipe unit, an inner pipe unit used in cooperation with the outer pipe unit, and a salvage unit for salvaging the inner pipe unit. The outer pipe unit includes The coring drill bit, the outer pipe body, the elastic card chamber, the core drilling rod and the water stool are arranged coaxially in sequence; the inner pipe unit includes a core pipe arranged coaxially in sequence, an elastic card matched with the elastic card chamber and a The stall braking device is the stall braking device described in the present invention, and the salvage unit is connected to the spearhead of the stall braking device. The drilling tool of the present invention can adjust the azimuth angle of the coring bit according to the hole inclination data, adjust the drilling trajectory, and does not need to lift the entire drill pipe string, realizes continuous directional coring drilling, can greatly save labor, and increase drilling per unit time. Back times, improve efficiency.

Description

A directional wireline core drilling tool and its drilling method

technical field

The invention belongs to the technical field of drilling, in particular to a directional wireline core drilling tool and a drilling method thereof.

Background technique

Domestic directional drilling technology is widely used in coal mines and oil exploration. The combined drilling process of wireline coring and screw directional full drilling is used in oil exploration wells. The continuous directional coring drilling technology can timely grasp and adjust the drilling trajectory of the exploration core hole, so that it can extend along the preset exploration trajectory, improve the radiation area of a single hole, and make the exploration target more clear and specific. At present, there is no related technology in China that can solve the problem of continuous directional coring. Moreover, during the drilling process, the inner pipe drilling tool is prone to get stuck, which makes it impossible to salvage. Strong salvage can easily cause the salvage wire rope to break in the drill pipe or outside the drill pipe, which is difficult to lift and repair, which greatly affects the drilling efficiency; During the drilling process, when the inner tube drilling tool is salvaged, the component force of its gravity in the axial direction of the drill pipe string and the pulling force of the salvage wire rope act at the same time, which is easy to cause the overall inner tube drilling tool to accelerate and slide down, rush out of the drill pipe, and cause equipment and personnel injury accidents. .

SUMMARY OF THE INVENTION

In order to solve the above problems, the present invention provides a directional wireline core drilling tool and a drilling method thereof, which solves the engineering and technical difficulties of continuous directional coring, and the existing wireline core drilling tools are prone to inner tube drilling during the drilling process. The problem of stalling and sliding of the inner pipe drilling tool during the drilling process of the stuck and upward hole.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions to realize:

A stall braking device for a directional rope core drilling tool, comprising a spear head, a braking body, a braking spring, a clamping block, a return spring for resetting the clamping block, and a support;

The center of the braking body is provided with a first through hole which penetrates along the axial direction of the braking body and is used for setting the spearhead; A limit block and a second limit block, the first limit block and the second limit block are respectively arranged at both ends of the brake body, and the two ends of the brake spring are pushed against the first limit block respectively. On the position block and the first through hole, the elastic direction of the braking spring is along the axial direction of the first through hole of the spear head; the end of the spear head close to the first limit block is set to be tapered; Around a through hole, the support is provided with a second through hole for the clamping block to pass through, the second through hole is along the direction perpendicular to the first through hole; the elastic force direction of the return spring is along the direction of the second through hole , the spear fishing head gradually moves outward through its conical end pressing block until it is pressed against the inner wall of the core drill pipe.

Specifically, the center of the braking body is provided with a third through hole and a fourth through hole coaxial with the first through hole, the diameter of the third through hole is larger than that of the first through hole, and the diameter of the fourth through hole is larger than that of the first through hole. The diameter of the fourth through hole is larger than that of the third through hole, and the axial length of the fourth through hole is the moving distance of the spear head along the axial direction of the braking body.

Specifically, the clamping block is a T-shaped rod body, the lateral end of the clamping block is arranged on the outer side of the support, the circumference of the vertical end of the clamping block is provided with a groove, and the two ends of the return spring are pressed against the support and the concave respectively. The bottom of the slot; the vertical end of the clamping block is set as an arc surface.

The invention also discloses a directional wireline core drilling tool, comprising an outer pipe unit, an inner pipe unit used in cooperation with the outer pipe unit, and a salvage unit for salvaging the inner pipe unit, wherein the outer pipe unit includes a coaxial arrangement in sequence. The core drill bit, the outer pipe body, the snap chamber, the core drill pipe and the water stool; the inner pipe unit includes a core pipe arranged coaxially in sequence, a snap card and a stall matched with the snap chamber. A braking device, the stall braking device is the stall braking device of the present invention; the salvage unit is connected with the spearhead of the stall braking device when salvaging the inner pipe unit.

Specifically, the outer pipe body includes a first joint, a hollow screw and a second joint, and the first joint and the second joint are both hollow structures; the first joint is connected to the core bit through a centralizer connection, the second joint is connected with the clip chamber; the hollow screw comprises a hollow screw rotor, a hollow screw stator and a universal shaft connecting the hollow screw rotor and the hollow screw stator, the first joint is connected with the hollow screw rotor, The second joint is connected with the hollow screw stator; the inner tube unit is provided with an impactor and a vibration transmission member for transmitting the vibration of the impactor to the outer tube body, and the impactor is arranged between the core tube and the elastic body. Between the clips, the vibration transmission member is arranged around the outer wall of the core tube, and the vibration transmission member is in contact with the outer tube body.

Specifically, a centralizer ring is provided at the connection between the centralizer and the first joint.

Specifically, the vibration transmission member includes a first vibration transmission ring and a second vibration transmission ring, the first vibration transmission ring is arranged at the connection between the first joint and the hollow screw rotor, and the second vibration transmission ring is nested in the core on the outer wall of the tube, and the first vibration transmission ring and the second vibration transmission ring are in contact.

Further, it also includes an inclinometer unit, the inclinometer unit includes an inclinometer and a non-magnetic drill pipe short joint, and the non-magnetic drill pipe short joint is arranged between the outer pipe body and the clip chamber, the The inclinometer is set within the range of the sub-section of the non-magnetic drill pipe.

Specifically, the salvage unit includes a quick-break fishing device, a wire rope and a hoist; the quick-breaking fishing device includes a fishing hook, a rope pressing block, a pin shaft and a fishing sleeve, and the fishing hook is a spring reset structure, The fishing hook is connected with the fishing spear head; the fishing sleeve is provided with a pin shaft hole for the pin shaft to pass through, and the pressing rope block is hinged in the fishing sleeve through the pin shaft; one end of the wire rope is fixed on the pressing rope block , and the other end is connected to the winch.

The present invention also discloses a continuous directional core drilling method, which adopts the drilling tool of the present invention for drilling, and the method specifically includes the following steps:

Step 1: Before starting the return, lift the outer pipe unit off the bottom of the hole, and use a high-pressure mud pump to flush the inner pipe unit to the hanging position;

Step 2, turn on the mud pump, drive the impactor and the hollow screw, the bottom of the hole impacts the rotary composite cutting rock, and the drilling trajectory extends according to the original azimuth angle of the drill bit; when the core tube is filled with the core, go to step 3;

Step 3, use the salvage unit and the water to salvage the inner tube unit, after the inner tube unit is salvaged to the ground, read the inclinometer data, and draw the hole inclination and time curve;

Step 4, adjust the azimuth angle of the drill bit according to the hole inclination data, and repeat steps 1 to 3 for continuous directional core drilling after the inner pipe unit is placed in place.

Compared with the prior art, the beneficial effects of the present invention are:

(1) Stall braking: in the drilling process of the upward hole, when the inner pipe unit stalls, the braking spring in the stall braking device of the present invention extends and pushes the spearhead to move in the direction of the drill bit, and the tapered end of the spearhead pushes The clamping block moves toward the inner wall of the drill pipe, and the friction between the clamping block and the inner arm of the drill pipe effectively slows down the movement speed of the inner pipe and the inner pipe unit, and realizes the function of stall braking.

(2) Inclination measurement and continuous drilling can be realized: inclinometer is used for inclination measurement, the azimuth angle of the coring bit is adjusted according to the hole inclination data, and the drilling trajectory is adjusted. Core drilling can greatly save labor, increase drilling times per unit time, and improve efficiency.

(3) High drilling efficiency: During the drilling process of the inner tube unit of the present invention, the high-pressure mud drive impactor drives the inner tube unit to generate axial reciprocating impact as a whole, and the vibration ring impacts the vibration transmission ring, and the impact energy is transmitted to the core bit. up; the high-pressure mud flows down, drives the hollow screw rotor to rotate, and realizes the rotation of the core bit. The impactor and the hollow screw work at the same time to realize the impact rotary compound drilling at the bottom of the hole and improve the drilling efficiency.

(4) Solve the stuck problem of the inner pipe drilling tool: when the inner pipe unit is stuck in the process of salvaging the inner pipe unit, increase the pressure of the driving system, hoist and rotate to break the pin shaft, and recover the steel wire rope in the drill pipe. It is convenient to lift the drill to deal with accidents and avoid the wire rope breaking outside or inside the drill pipe.

Other features and advantages of the present invention will be described in detail in the detailed description that follows.

Description of drawings

FIG. 1 is a schematic structural diagram of a part of the front section of the directional coring drilling tool described in Embodiment 2 of the present invention.

Fig. 2 is a schematic diagram showing the structure of the middle section of the directional coring drilling tool according to the second embodiment of the present invention.

FIG. 3 is a schematic diagram of a partial structure of the rear section of the directional coring drilling tool described in Embodiment 2 of the present invention.

FIG. 4 is a structural diagram of the stall brake device according to Embodiment 1 of the present invention.

Figure 5 is a schematic diagram of broken rope in the hole during horizontal drilling.

Figure 6 is a schematic diagram of a broken wire outside the hole during horizontal drilling.

Fig. 7 is a schematic diagram of stalling of the salvage drilling tool during upward drilling.

The symbols in the figure are represented as:

1- Outer tube unit, 2- Inner tube unit, 3- Salvage unit, 4- Inclination unit;

101-Coring bit, 102-Outer tube body, 103-Elastic card chamber, 104-Coring drill pipe, 105-Shuibian, 106-First joint, 107-Hollow screw, 108-Second joint, 109- Centralizer, 110-hollow screw rotor, 111-hollow screw stator, 112-cardan shaft, 113-centralizing ring;

201-core tube, 202-spring clip, 203-stall braking device, 204-impacter, 205-vibration transmission, 206-first vibration transmission ring, 207-second vibration transmission ring, 208-spearhead, 209-brake body, 210-brake spring, 211-block, 212-return spring, 213-support, 214-first through hole, 215-first limit block, 216-second limit block, 217 - the third through hole, 218 - the fourth through hole;

301-quick break fish, 302-wire rope, 303-hoist, 304-fishing hook, 305-line pressure block, 306-pin, 307-fishing sleeve.

401 - Inclinometer, 402 - Non-magnetic drill pipe sub.

The specific content of the present invention will be further explained in detail below in conjunction with the accompanying drawings and specific embodiments.

Detailed ways

The specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent transformations made on the basis of the technical solutions of the present application all fall into the protection scope of the present invention.

In the present invention, unless otherwise stated, the directional words used such as "upper, lower, bottom" generally refer to the definition based on the drawings of the corresponding drawings, and "inside and outside" refer to the corresponding The outlines of the drawings are defined as fiducials.

Example 1

This embodiment discloses a stall braking device for a directional wireline core drilling tool. As shown in FIG. 4 , the device includes a spearhead 208, a braking body 209, a braking spring 210, a clamping block 211, which is used to reset the clamping Return spring 212 and support 213 of block 211;

Wherein, the center of the braking body 209 is provided with a first through hole 214 penetrating along the axial direction of the braking body 209 for arranging the spearhead 208; The first limiting block 215 and the second limiting block 216 are respectively arranged at both ends of the braking body 209 . In this embodiment, the middle part of the spear head 208 is a rod body structure, and both ends are conical structures. The first limiting block 215 is a disc-shaped flange, which is arranged between the rod body in the middle part of the spear head 208 and one of the conical ends. ; The second limit block 216 is also a disc-shaped flange, which is arranged near the connection between the other conical end and the middle rod body. The center of the braking body 209 is provided with a third through hole 217 and a fourth through hole 218 coaxial with the first through hole 214 . The diameter of the third through hole 217 is larger than that of the first through hole 214 and the diameter of the fourth through hole 218 is larger than that of the first through hole 214 . The length of the third through hole 217 and the fourth through hole 218 along the axial direction is the moving distance of the spearhead 208 along the axial direction. The diameter of the middle rod body of the spearhead 208 matches the diameter of the first through hole 214 , the diameter of the outer ring of the braking spring 210 is slightly smaller than the diameter of the third through hole 217 , and the two ends of the braking spring 210 are pushed against the first limit respectively. On the block 215 and the first through hole 214 , the elastic force direction of the braking spring 210 is along the axial direction of the first through hole 214 ; the outer diameter of the second limiting block 216 matches the diameter of the fourth through hole 218 .

The support member 215 is disposed around the first through hole 214, and in this embodiment, the support member is a cylindrical structure. One end of the support member is fixed on the braking body around the first through hole 214 . The support member 213 is provided with a second through hole (not shown in the figure) through which the clamping block 211 passes, and the second through hole is in a direction perpendicular to the first through hole 214 . The direction of the elastic force of the return spring 212 is along the direction of the second through hole, and the spear head 208 pushes the blocking block 211 through one of the tapered ends and gradually moves to the outside until the blocking block is pressed against the inner wall of the core drill rod 104 . In the embodiment, the clamping block 211 is a T-shaped rod body, the lateral end of the clamping block 211 is arranged on the outer side of the support member 213 , the circumference of the vertical end of the clamping block 211 is provided with a groove, and the two ends of the return spring 212 are pushed against each other. At the edge of the support member 213 and the groove; the vertical end of the clamping block 211 is set as a circular arc surface to reduce the frictional force between the clamping block 211 and the conical contact surface. Wherein, a plurality of clamping blocks 211 may be evenly arranged around the circumferential direction of the spear head 208 .

The moving distance of the braking body 209 should ensure that the clamping block 211 can be pressed against the inner wall of the core drill rod 104 . Specifically, as shown in FIG. 2 , the distance between the clamping block 211 and the inner wall of the drill pipe is L1, and the distance between the second limit block 216 of the spearhead 208 outside the braking body 209 and the braking body 209 is L2, The angle between the tapered surface of the tapered end and the axis is β. In order to ensure the reliability of braking, it should be ensured that L2≥L1×cotβ.

When salvaging the inner pipe drilling tool normally, the salvage unit 3 grabs the spearhead 208 to extract it from the orifice, the braking spring 210 is compressed, the return spring 212 extends and pushes the clamping block 211 to move toward the axis of the drill pipe string, and the clamping block 211 retracts inside the brake body 209 . As shown in FIG. 6 , during the upward drilling process, when the inner pipe unit stalls, the braking spring 210 extends and pushes the spearhead 208 to move toward the drill bit, and the inclined plane pushes the block 211 to move toward the inner wall of the drill pipe, and the block 211 moves toward the drill pipe. The friction force with the inner arm of the drill pipe effectively slows down the movement speed of the inner pipe drilling tool and realizes the function of stall braking.

Example 2

This embodiment discloses a directional wireline core drilling tool, as shown in FIGS. 1 to 3 , the core drilling tool includes an outer pipe unit 1 , an inner pipe unit 2 used in cooperation with the outer pipe unit 1 , and a Fishing unit 3 of pipe unit 2. The outer pipe unit 1 includes a core drill bit 101, an outer pipe body 102, a snap chamber 103, a core drill pipe 104 and a water stool 105, which are arranged coaxially in sequence; the inner pipe unit 2 includes cores arranged coaxially in sequence. The tube 201, the clip 202 clamped in the clip chamber 103, and the stall braking device 203, the stall braking device 203 is the stall braking device described in Embodiment 1, wherein the salvage unit 3 and the stall braking device 203 Spearhead 208 is connected. The clip 202 and the clip chamber 103 are conventional structures of drilling tools currently on the market.

In this embodiment, the outer tube body 102 includes a first joint 106 , a hollow screw 107 and a second joint 108 . The first joint 106 and the second joint 108 are both hollow structures; the first joint 106 is connected to the coring bit 101 through the centralizer 109 , and a centralizing ring 113 is provided at the connection between the centralizer 109 and the first joint 106 . The second connector 108 is connected to the clip chamber 103 . The hollow screw 107 includes a hollow screw rotor 110, a hollow screw stator 111, and a universal shaft 112 connecting the hollow screw rotor 110 and the hollow screw stator 111. The first joint 106 is connected with the hollow screw rotor 110 by a thread, and the second joint 108 is connected with the hollow screw The stator 111 is screwed together, and the inner diameter of the hollow screw 107 enables the core tube 201 to pass through smoothly. As shown in FIG. 1 , the bending angle α of the hollow screw 107 is selected according to the formation conditions, and the higher the formation hardness, the smaller the bending angle α.

An impactor 204 and a vibration transmission member 205 for transmitting vibration of the impactor 204 to the outer tube body 102 are provided in the inner tube unit 2 . The impactor 204 is commercially available, the impactor 204 is arranged between the core tube 201 and the clip 103 , the vibration transmission member 205 is arranged around the outer wall of the core tube 201 , and the vibration transmission member 205 is in contact with the outer tube body 102 . Specifically, in this embodiment, the vibration member 205 includes a first vibration transmission ring 206 and a second vibration transmission ring 207 , and the first vibration transmission ring 206 is disposed at the connection between the first joint 106 and the hollow screw rotor 110 . A circumferential groove is provided on the outer wall of the core tube 201, and the second vibration transmission ring 207 is nested in the groove. And the first vibration transmission ring 206 and the second vibration transmission ring 207 are in contact. It should be noted that the thickness of the wall of the core pipe 201 is thicker than that of the conventional core pipe, so as to satisfy the bearing effectiveness of the core pipe during vibration, and the vibration of the impactor 204 is transmitted to the core bit 101 through the vibration transmission member 205 . .

Through the hollow screw 207 matching the impactor 204 and the vibration transmission member 205, during the drilling process of the inner pipe unit of the present invention, the high-pressure mud drives the impactor to drive the inner pipe unit as a whole to generate axial reciprocating impact, the vibration ring impacts the vibration transmission ring, and the impact The work is transmitted to the coring bit; the high-pressure mud flows down, and drives the hollow screw rotor to rotate to realize the rotation of the coring bit. The impactor and the hollow screw work at the same time to realize the impact rotary compound drilling at the bottom of the hole and improve the drilling efficiency.

The salvage unit 3 is used when salvaging the inner pipe unit 2. As a preferred embodiment of the present invention, the salvage unit 3 in this embodiment includes a quick-break overshot 301, a wire rope 302 and a hoist 303; the quick-break overshot 301 includes a fishing hook 304. The rope pressing block 305, the pin shaft 306 and the fishing sleeve 307. The fishing hook 304 is a spring reset structure. During the salvage process, as shown in Figure 2. The salvage sleeve is cylindrical with one end open. The side of the salvage sleeve 307 is provided with a pin shaft hole for the pin shaft 306 to pass through. On the block 305, the other end is connected with the hoisting 303. When the inner pipe unit 2 is caught in the process of salvaging the inner pipe unit 2, the pressure of the driving system is increased, the hoist 303 is rotated to break the pin shaft 306, and the wire rope 302 in the drill pipe is retracted, which is convenient for lifting the drill to deal with accidents and avoid The wire rope 302 breaks outside or inside the drill pipe, as shown in Figures 4-5. The broken wire rope will greatly increase the labor intensity of drilling and reduce the efficiency. The ultimate shear force of the pin shaft 306 is calibrated by a specific material and heat treatment process, and the ultimate shear force should be greater than the resistance of the inner tube drilling tool during the salvage process, and less than the breaking force of the wire rope.

Example 3

The difference between this embodiment and Embodiment 2 is that the directional wireline core drilling tool of this embodiment further includes an inclinometer unit 4, and the inclinometer unit 4 includes an inclinometer 401 and a non-magnetic drill pipe short section 402. The non-magnetic drill pipe The short joint 402 is set between the outer tube body 102 and the clip chamber 103, and the inclinometer 401 is set within the range of the short joint 402 of the non-magnetic drill pipe. If the impactor 204 is added, it is set between the impactor 204 and the clip 103. between. The inclinometer 401 in this embodiment is an electric storage inclinometer.

The inclinometer 401 measures the inclination at equal time intervals, and stores the test data inside the instrument. Every time the inner pipe unit 2 is salvaged, the data is read or the battery is replaced, the hole inclination time curve is drawn, and the coring bit is adjusted according to the hole inclination data. 101 azimuth angle, adjust the drilling trajectory without lifting the entire drill pipe string, realize continuous directional core drilling, which can greatly save labor, increase drilling times per unit time, and improve efficiency.

Example 4

The present embodiment discloses a continuous directional core drilling method. The method adopts the drilling tool described in Embodiment 3 for drilling, and the method specifically includes the following steps:

Step 1: Before starting the return, lift the outer pipe unit 1 away from the bottom of the hole, and use a high-pressure mud pump to flush the inner pipe unit 2 to the hanging position;

Step 2, turn on the mud pump, drive the impactor 204 and the hollow screw 107, the bottom of the hole impacts the rotary composite cutting rock, and the drilling trajectory extends according to the original azimuth angle of the drill bit; when the core tube 201 is filled with the core, step 3 is performed;

In step 3, the salvage unit 3 and the water stool 105 are used to salvage the inner tube unit. After the inner tube unit 2 is salvaged to the ground, the data of the inclinometer 401 is read, and the curve of hole inclination and time is drawn. Preferably, a Bluetooth device is used to read the data of the inclinometer 401;

Step 4: Adjust the azimuth angle of the drill bit according to the hole inclination data, and after lowering the inner pipe unit 2 in place, repeat steps 1 to 3 for continuous directional core drilling.

During the drilling process, if the inner pipe unit 2 stalls, the stall braking device 203 of the present invention makes the friction between the block and the inner wall of the drill pipe slow down the movement speed of the inner pipe drilling tool, and performs stall braking; When the inner pipe unit is stuck and cannot be taken out, increase the hoisting force to cut off the pin in the quick-break overshot, take out all the wire ropes and then lift the drill to deal with the stuck situation.

In the above description, unless otherwise clearly specified and limited, terms such as "arrangement" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, or a detachable connection or integration; connection, or indirect connection, etc. For those of ordinary skill in the art, the specific meanings of the above terms in the technical solution can be understood according to specific situations.

The specific technical features described in the above-mentioned specific embodiments can be combined in any suitable manner under the condition of no contradiction. As long as they do not violate the idea of the present invention, they should also be regarded as the content disclosed by the present invention. .

Claims (10)

1. A stall braking device for a directional rope core drill is characterized by comprising a fishing spearhead (208), a braking body (209), a braking spring (210), a clamping block (211), a return spring (212) for returning the clamping block (211) and a support piece (213);

the center of the braking body (209) is provided with a first through hole (214) which is axially penetrated along the braking body (209) and used for arranging a fishing spearhead (208); the fishing spear head (208) is provided with a first limiting block (215) and a second limiting block (216) which limit the axial moving distance of the fishing spear head (208) along the brake body (209), the first limiting block (215) and the second limiting block (216) are respectively arranged at two ends of the brake body (209), two ends of the brake spring (210) are respectively pressed against the first limiting block (215) and the first through hole (214), and the elastic force direction of the brake spring (210) is along the axial direction of the first through hole (214); the end part of the fishing spearhead (208) close to the first stop block (215) is provided with a conical shape;

the supporting piece (213) is arranged around the first through hole (214), a second through hole for the fixture block (211) to pass through is formed in the supporting piece (213), and the second through hole is vertical to the first through hole (214); the elastic force direction of the return spring (212) is along the direction of the second through hole, and the fishing spearhead (208) gradually moves outwards through the conical end part of the fishing spearhead to push against the clamping block (211) until the clamping block is pushed against the inner wall of the coring drill rod (104).

2. The stall stopping device for a directional rope core drill as claimed in claim 1, wherein the stopper body (209) is centrally provided with a third through hole (217) and a fourth through hole (218) which are coaxial with the first through hole (214), the third through hole (217) has a larger diameter than the first through hole (214), the fourth through hole (218) has a larger diameter than the third through hole (217), and the length of the fourth through hole (218) in the axial direction is the moving distance of the spearhead (208) in the axial direction.

3. The stall stopping device for a directional rope core drill as claimed in claim 1, wherein the latching block (211) is a T-shaped rod, the lateral end of the latching block (211) is disposed outside the supporting member (213), a groove is disposed on the circumference of the vertical end of the latching block (211), and two ends of the return spring (212) respectively bear against the supporting member (213) and the bottom of the groove; the tail end of the vertical end of the clamping block (211) is provided with an arc surface.

4. A directional rope core drill tool comprises an outer pipe unit (1), an inner pipe unit (2) matched with the outer pipe unit (1) and a fishing unit (3) for fishing the inner pipe unit (2), and is characterized in that,

the outer pipe unit (1) comprises a coring bit (101), an outer pipe body (102), an elastic clamping chamber (103), a coring drill rod (104) and a water closet (105) which are coaxially arranged in sequence;

the inner pipe unit (2) comprises a core barrel (201), a spring clip (202) and a stall braking device (203), wherein the core barrel (201), the spring clip (202) and the stall braking device (203) are coaxially arranged in sequence, and the stall braking device (203) is the stall braking device according to any one of claims 1 to 3;

the fishing unit (3) is connected with a fishing spearhead (208) of the stall brake device (203) when the inner pipe unit (2) is fished.

5. A directional rope core drill as set forth in claim 4, wherein said outer tubular body (102) comprises a first connector (106), a hollow screw (107) and a second connector (108), said first connector (106) and said second connector (108) each being of hollow construction; the first joint (106) is connected with the core bit (101) through a centralizer (109), and the second joint (108) is connected with the card ejecting chamber (103); the hollow screw (107) comprises a hollow screw rotor (110), a hollow screw stator (111) and a universal shaft (112) for connecting the hollow screw rotor (110) and the hollow screw stator (111), the first joint (106) is connected with the hollow screw rotor (110), and the second joint (108) is connected with the hollow screw stator (111); the inner pipe unit (2) in be provided with impacter (204) and be used for transmitting impacter (204) vibration to outer pipe body (102) pass and shake spare (205), impacter (204) set up between core barrel (201) and bullet card (103), pass and shake spare (205) and set up around core barrel (201) outer wall, and pass and shake spare (205) and outer pipe body (102) contact.

6. A directional rope core drill as claimed in claim 5, characterized in that the connection of said centralizer (109) to said first joint (106) is provided with a centralizing ring (113).

7. The directional rope core drill according to claim 5, wherein the vibration transmitting member (205) comprises a first vibration transmitting ring (206) and a second vibration transmitting ring (207), the first vibration transmitting ring (206) is disposed at the junction of the first joint (106) and the hollow screw rotor (110), the second vibration transmitting ring (207) is nested on the outer wall of the core barrel (201), and the first vibration transmitting ring (206) and the second vibration transmitting ring (207) are in contact.

8. A directional rope core drilling tool according to claim 4 or 5, further comprising an inclinometer unit (4), said inclinometer unit (4) comprising an inclinometer (401) and a non-magnetic pipe sub (402), said non-magnetic pipe sub (402) being arranged between the outer tubular body (102) and the sabot chamber (103), said inclinometer (401) being arranged within the non-magnetic pipe sub (402).

9. A directional rope core drill tool according to claim 4, characterized in that the fishing unit (3) comprises a quick-break fisher (301), a wireline (302) and a winch (303); the quick-break fisher (301) comprises a fishing hook (304), a rope pressing block (305), a pin shaft (306) and a fishing sleeve (307), wherein the fishing hook (304) is of a spring reset structure, and the fishing hook (304) is connected with a fishing spearhead (208); a pin shaft hole for a pin shaft (306) to pass through is formed in the salvaging sleeve (307), and the rope pressing block (305) is hinged in the salvaging sleeve (307) through the pin shaft (306); one end of the steel wire rope (302) is fixed on the rope pressing block (305), and the other end of the steel wire rope is connected with the winch (303).

10. A method of continuous directional core drilling, characterized by drilling with a drilling tool according to any one of claims 4 to 8, comprising the following steps:

step 1, before beginning again, lifting the outer pipe unit (1) away from the bottom of the hole, and punching the inner pipe unit (2) to a suspension position by using a high-pressure slurry pump;

step 2, starting a slurry pump, driving an impactor (204) and a hollow screw (107), impacting and rotating the hole bottom to cut rock compositely, and extending a drilling track according to the original azimuth angle of the drill bit; step 3 is carried out after the core barrel (201) is filled with the core;

step 3, fishing the inner pipe unit by adopting the fishing unit (3) and the water excrement (105) in a matching manner, after the inner pipe unit (2) is fished to the ground, reading the data of the inclinometer (401), and drawing a hole inclination and time curve;

and 4, adjusting the azimuth angle of the drill bit according to the hole inclination data, and repeating the steps 1 to 3 to perform continuous directional core drilling after the inner pipe unit (2) is put in place.

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