CN114412423A - Broken soft coal seam gas extraction bedding directional drilling sieve tube running device and method - Google Patents
Broken soft coal seam gas extraction bedding directional drilling sieve tube running device and method Download PDFInfo
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- CN114412423A CN114412423A CN202111577206.7A CN202111577206A CN114412423A CN 114412423 A CN114412423 A CN 114412423A CN 202111577206 A CN202111577206 A CN 202111577206A CN 114412423 A CN114412423 A CN 114412423A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/022—Determining slope or direction of the borehole, e.g. using geomagnetism
- E21B47/0228—Determining slope or direction of the borehole, e.g. using geomagnetism using electromagnetic energy or detectors therefor
Abstract
The invention discloses a broken soft coal seam gas extraction bedding directional drilling sieve tube running-in device and a broken soft coal seam gas extraction bedding directional drilling sieve tube running-in method, wherein the device comprises a directional drilling tool string and a sieve tube drilling tool string, and the directional drilling tool string comprises a drilling rod, an electromagnetic wave measurement-while-drilling device, a bent pipe and a drill bit which are sequentially connected; the screen pipe drilling string comprises a lower inlet pipe and a screen pipe which are sequentially connected, and the front end and the rear end of the screen pipe are respectively provided with a screen pipe front end positioning head and a screen pipe tail end positioning head. The invention solves the problems that the prior device and method can not determine the position of the screen pipe for running into the borehole and can not realize the full-hole section screen pipe running, can measure the borehole track in real time in the process of running the screen pipe, accurately judge the running position of the screen pipe, dynamically adjust the running direction of the screen pipe, realize the running of the full-hole section screen pipe for drilling, effectively protect the length of the hole section, and improve the gas extraction effect of the broken soft coal seam.
Description
Technical Field
The invention belongs to the field of coal mine gas control, and particularly relates to a device and a method for running a broken soft coal seam gas extraction bedding directional drilling sieve tube.
Background
The development of the underground broken soft coal seam gas extraction drilling and pore-forming process of the coal mine is successively subjected to a hydraulic slag-discharging drilling technology, an intermediate wind pressure wide-wing spiral drill rod drilling technology, a three-edged drill rod drilling technology, a high-rotating speed spiral drilling technology and an air casing drilling technology, and the bedding drilling hole depth of the broken soft coal seam is increased to about 200 m. However, in the technologies, a rotary drilling process is adopted for drilling construction, the drilling track cannot be measured and controlled while drilling, the coal seam drilling rate is low, the drilling depth is shallow, and the gas extraction efficiency needs to be further improved. At present, the air composite directional drilling technology realizes the purpose of directional drilling of the broken soft coal seam along the bedding long distance, improves the record of the drilling depth to more than 300m, can measure and control the drilling track while drilling, greatly improves the coal seam drilling rate, and improves the gas extraction effect of the broken soft coal seam.
The long-distance directional drilling of the bedding layer of the broken soft coal seam is generally constructed by adopting a forward branch-opening method, namely: during construction, the inclination angle of the drill hole is actively adjusted upwards at certain intervals to perform roof probing operation so as to predict the trend of the coal seam and the top rock stratum, the roof probing is retreated, the drill hole is drilled downwards at a proper distance, and the branch hole is used as a main hole to continue drilling towards the deep position, so that the drill hole is ensured to extend in the coal seam. After the broken soft coal seam is drilled into a hole along the bedding layer, the hole is generally protected by adopting a method of putting a screen pipe into an orifice or putting a screen pipe into a drill rod. The existing two screen pipe running methods have the following problems: firstly, the drilling track can not be measured in the screen pipe running process, and the accurate running position of the screen pipe can not be judged; secondly, the screen pipe does not have the capability of adjusting the screen pipe running direction in the running process, and the accurate running of the main hole to the branch hole or the branch hole to the main hole cannot be realized; and thirdly, the screen pipe of the full-hole section of the main hole and the branch hole cannot be lowered, the hole protecting section of the screen pipe is short, and the gas extraction quantity and the gas extraction rate are low.
Disclosure of Invention
Aiming at the defects that the accurate position of the screen pipe feeding can not be judged, the accurate feeding of the main hole to the branch hole or the branch hole to the main hole can not be realized, the screen pipe feeding of the whole hole section of the drilled hole can not be realized, the screen pipe hole section is short, the gas extraction efficiency is low and the like when the broken soft coal seam bedding drilling hole protection is carried out in the prior art, a designer of the invention comprehensively engages in the experience and the achievement of related industries through careful research and design, and provides the broken soft coal seam gas extraction bedding directional drilling screen pipe feeding device and the method, which can realize the measurement of the drilling track while drilling in the screen pipe feeding process, accurately judge the feeding position of the screen pipe, can simultaneously complete the accurate feeding of the main hole to the branch hole or the branch hole to the main hole, realize the screen pipe feeding of the whole hole section of the drilled hole, have long effective hole protection time and improve the gas extraction amount and the gas extraction efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme to solve the problem:
a screen pipe running-in device for directional drilling of a broken soft coal seam gas extraction bedding comprises a directional drilling tool string and a screen pipe drilling tool string, wherein the directional drilling tool string comprises a drilling rod, an electromagnetic wave measurement-while-drilling device, a bent pipe and a drill bit which are sequentially connected; the screen pipe drilling string comprises a lower inlet pipe and a screen pipe which are sequentially connected, and the front end and the rear end of the screen pipe are respectively provided with a screen pipe front end positioning head and a screen pipe tail end positioning head.
Furthermore, a screen pipe centralizer is installed in the middle of the screen pipe.
Furthermore, the electromagnetic wave measurement while drilling device comprises a mounting short section, a measurement short section, a power supply short section, a transmission control short section and an insulation short section; the installation short section is of a non-equal-wall-thickness structure with thick two ends and thin middle part, and the outer wall of the wall-thickness part is provided with a groove for installing a measurement short section, a power supply short section and a transmission control short section; the inner walls of the connecting sections of the wall thickness part of the mounting short section and the wall thin parts at the two ends of the mounting short section are respectively processed with a slope angle; and one end of the launch control short section is communicated with the bent pipe through an armored cable arranged in a wire slot formed in the outer wall of the installation short section, the insulation short section and the bent pipe, and the other end of the launch control short section is communicated with the drill rod.
Furthermore, a pressure detection port is arranged below the installation position of the launch control short section in the installation short section.
Furthermore, the bending angle of the bent pipe is larger than that of a screw motor used for directional drilling construction.
Furthermore, on the screen pipe drilling string, the length of the screen pipe between the screen pipe tail end positioning head and the screen pipe front end positioning head is equal to the length of the expected descending hole protecting section.
Furthermore, the lower inlet pipe is in threaded connection with a positioning head at the tail end of the sieve pipe through a reverse thread, the positioning head at the tail end of the sieve pipe is in threaded connection with the sieve pipe through a positive thread, and the sieve pipe is in threaded connection with a positioning head at the front end of the sieve pipe through a positive thread; the sieve tube is formed by connecting two sections of sieve tubes, the sieve tubes at two ends are connected by adopting positive threads, and a sieve tube centralizer is arranged at the joint.
On the other hand, the invention also provides a method for running the broken soft coal seam gas extraction bedding directional drilling sieve tube, which is carried out by adopting the broken soft coal seam gas extraction bedding directional drilling sieve tube running device provided by the invention and comprises the following steps:
step 1, a directional drilling tool string is put in, and when the depth of a first branch hole is close, the directional drilling tool string is adjusted to enable an elbow of a bent pipe of the directional drilling tool string to face to the right upper side;
step 2, the directional drilling tool string is lowered to a position 0.4-0.5 m away from the bottom of the first branch hole;
step 3, selecting a sieve tube according to the depth of the first branch hole, enabling the length of the sieve tube between a positioning head at the tail end of the sieve tube and a positioning head at the front end of the sieve tube to be equal to the depth of the first branch hole, and utilizing a running pipe to run the sieve tube drilling string from a central channel of the directional drilling string to the bottom of the first branch hole;
step 4, the orifice rotates the running pipe clockwise to separate the running pipe from the positioning head at the tail end of the sieve pipe, the running pipe is withdrawn from the drilled hole, the directional drilling tool string is pulled back to return to the main hole, and at the moment, the positioning head at the tail end of the sieve pipe, the sieve pipe and the positioning head at the front end of the sieve pipe are retained in the first branch hole to complete running of the sieve pipe of the first branch hole;
step 5, adjusting the directional drilling tool string to enable the elbow of the bent pipe to face downwards, and descending the directional drilling tool string to the next branch hole along the main hole, repeating the steps 2, 3 and 4, wherein the descending mode of each branch hole is the same as that of the first branch hole until all the branch holes are descended into the sieve tube;
step 6, pulling back the directional drilling tool string to return to the main hole, adjusting the directional drilling tool string to enable the elbow of the directional drilling tool string to face downwards, enabling the directional drilling tool string to be lowered to a position 0.4-0.5 m away from the hole bottom of the main hole along the main hole, selecting reasonable sieve tube length according to the depth of the main hole, enabling the length of the sieve tube between the tail end positioning head of the sieve tube and the front end positioning head of the sieve tube to be equal to the depth of the main hole, and lowering the sieve tube drilling tool string from a center channel of the directional drilling tool string to the hole bottom of the main hole by using a lowering pipe;
and 7, clockwise rotating the running pipe to separate the running pipe from the screen pipe tail end positioning head, withdrawing the running pipe from the drilled hole, and pulling back the directional drilling tool string to withdraw from the drilled hole, so that the screen pipe tail end positioning head, the screen pipe and the screen pipe front end positioning head are reserved in the main hole, and the screen pipe running of the drilled full-hole section is completed.
Further, in the steps 2, 5 and 6, the orientation of the elbow is judged by the tool facing angle of the electromagnetic wave measurement while drilling device, when the tool facing angle is 0 °, the elbow of the elbow faces directly above, and when the tool facing angle is 180 °, the elbow of the elbow faces directly below.
Further, in the steps 4, 5, and 6, a method of determining whether the directional drill string is run into the main hole or the branch hole includes: supplying air into the directional drilling tool string from the orifice, starting to measure an inclination angle, an azimuth angle and a tool facing angle by the electromagnetic wave measurement while drilling device, judging that the directional drilling tool string is lowered into the main hole if the measured inclination angle and the measured azimuth angle are consistent with the measured inclination angle and the measured azimuth angle in the actual drilling track parameters, and otherwise, judging that the directional drilling tool string is lowered into the branch hole.
Compared with the prior art, the invention has the following technical effects:
(1) the screen pipe is accurately lowered. In the screen pipe running process, the electromagnetic wave measurement while drilling device is adopted to measure the inclination angle and the azimuth angle parameters of the drill hole, and the running position of the screen pipe can be accurately judged by comparing the inclination angle and the azimuth angle parameters with the actual drilling data of the drill hole, so that the running depth is accurate and controllable.
(2) The device has the capability of adjusting the running direction of the sieve tube. The directional drilling tool provided by the invention is provided with the bent pipe in series, the orientation of the bent pipe can be adjusted by rotating the bent pipe to enter the pipe at the orifice, the orientation angle of the bent pipe can be determined by utilizing the measuring tool surface of the electromagnetic wave measurement while drilling device, and the directional drilling tool has the capability of adjusting the entering direction of the sieve pipe.
(3) And (4) arranging protective holes below the sieve tube of the full-hole section of the main hole and the branch hole of the drill hole. According to the screen pipe running device and the screen pipe running method, the running position of the screen pipe is accurate, the capability of adjusting the running direction of the screen pipe is realized, the main hole can be accurately run into the branch hole or the branch hole can be accurately run into the main hole, the screen pipe running of the main hole and the branch hole full-hole section is ensured, the hole protection effect is good, and the gas extraction amount and the extraction rate can be improved.
Drawings
Figure 1 is a schematic view of a screen running apparatus.
FIG. 2 is a schematic view of a directional string connection.
FIG. 3 is a schematic view of a screen string connection.
The reference numerals in the drawings mean: the method comprises the following steps of 1-directional drilling string, 2-screen pipe drilling string, 101-drill pipe, 102-electromagnetic wave measurement while drilling device, 103-installation short joint, 104-measurement short joint, 105-power supply short joint, 106-emission control short joint, 107-armored cable, 108-insulation short joint, 109-bent pipe, 110-drill bit, 201-lower pipe, 202-screen pipe tail end positioning head, 203-screen pipe, 204-screen pipe centralizer and 205-screen pipe front end positioning head.
The invention is further explained below with reference to the drawings and the detailed description.
Detailed Description
Referring to fig. 1 to 3, the screen pipe running device for the directional drilling of the bedding for extracting the broken soft coal seam gas comprises a directional drilling tool string 1 and a screen pipe drilling tool string 2; the directional drilling tool string 1 comprises a drilling rod 101, an electromagnetic wave measurement while drilling device 102, a bent pipe 109 and a drill bit 110 which are sequentially connected by adopting a positive thread; the screen pipe drilling string 2 comprises a lower inlet pipe 201 and a screen pipe 203 which are connected in sequence, and the front end and the rear end of the screen pipe 203 are respectively provided with a screen pipe front end positioning head 205 and a screen pipe tail end positioning head 202. Preferably, a screen centralizer 204 is installed in the middle of the screen 203. Screen front end retainer 205 and screen end retainer 202 employ screen hangers.
As a preferred implementation manner of the present invention, referring to fig. 2, the electromagnetic wave measurement while drilling device 102 includes a mounting nipple 103, a measurement nipple 104, a power supply nipple 105, a launch control nipple 106, and an insulation nipple 108; the installation short section 103 is of a non-equal-wall-thickness structure with thick two ends and thin middle part, and the outer wall of the wall-thickness part is provided with a groove for installing a measurement short section 104, a power supply short section 105 and a launch control short section 106; the inner walls of the connecting sections of the wall thickness part of the installation short section 103 and the wall thin parts at the two ends of the installation short section are all processed with slope angles so as to reduce the resistance of the screen pipe drilling string 2 passing through the installation short section 103. One end of the launch control short section 106 is communicated with the bent pipe 109 through an armored cable 107 arranged in a slot formed in the outer walls of the installation short section 103, the insulation short section 108 and the bent pipe 109, and the other end of the launch control short section 106 is communicated with the drill rod 101, so that a left emitting electrode and a right emitting electrode which are electrically insulated and separated by the insulation short section 108 are formed, and transmission of electromagnetic wave signals from equipment in a hole to orifice equipment is carried out. Preferably, a pressure detection port is arranged below the installation position of the launch control short joint 106 in the installation short joint 103, and a pressure switch for the launch control short joint 106 is used for detecting the pressure in the directional drilling string 1. In the technical scheme, when the orifice equipment supplies air to the directional drilling tool string 1, the pressure switch of the launch control short joint 106 is turned on, and the electromagnetic wave measurement while drilling device 102 measures the inclination angle, the azimuth angle and the tool facing angle and transmits the measured inclination angle, the azimuth angle and the tool facing angle to the orifice equipment; when the orifice device stops supplying air into the directional drilling tool string 1, the pressure switch of the launch control pup joint 106 is closed, and the electromagnetic wave measurement while drilling device 102 stops signal measurement and enters a standby state.
The bend angle of the elbow 109 is larger than the bend angle of the screw motor used in directional drilling construction, so as to ensure that the screen pipe 203 is smoothly lowered from the main hole to the branch hole.
Referring to FIG. 3, the length of the screen 203 between the screen end retainer 202 and the screen front end retainer 205 on the screen string 2 is equal to the length of the expected run-in grommet section; preferably, the running pipe 201 is connected with the screen end positioning head 202 by reverse threads, the screen end positioning head 202 is connected with the screen 203 by positive threads, and the screen 203 is connected with the screen front end positioning head 205 by positive threads. Preferably, the screen pipe 203 is formed by connecting two sub-screen pipes, the two sub-screen pipes are connected by adopting positive thread threads, and a screen pipe centralizer 204 is arranged at the connection position. In the above technical scheme, after the screen pipe front end positioning head 205 is lowered to a predetermined depth, the screen pipe drilling string 2 is rotated in the forward direction at the orifice to complete the separation of the lowering pipe 201 and the screen pipe tail end positioning head 202, so that the screen pipe 203 is lowered. The screen pipe tail end positioning head 202 and the screen pipe front end positioning head 205 are in a contraction state in the directional drilling tool string 1, and are in an elastic opening state after extending out of the drill bit 110, so that the screen pipe 203 is positioned and centered, meanwhile, the screen pipe centering guide 204 in the middle of the screen pipe 203 is used for reducing the area of the screen pipe 203 attached to the hole wall, and the gas extraction effect is improved.
The full-hole section hole protecting method for realizing directional drilling of the broken soft coal seam bedding by utilizing the broken soft coal seam gas extraction bedding directional drilling sieve tube running-in device comprises the following steps:
step 1, a directional drilling tool string 1 is put in, when the depth of a first branch hole is close, the directional drilling tool string 1 is adjusted to enable an elbow of an elbow pipe 109 of the directional drilling tool string to face to the right upper side,
step 2, the directional drilling tool string 1 is lowered to a position 0.4-0.5 m away from the bottom of the first branch hole, so that the positioning head 205 at the front end of the sieve tube drilling tool string 2 can smoothly penetrate out of the drill bit 110;
step 3, selecting the screen pipe 203 according to the depth of the first branch hole, enabling the length of the screen pipe 203 between the screen pipe tail end positioning head 202 and the screen pipe front end positioning head 205 to be equal to the depth of the first branch hole, and using the running pipe 201 to run the screen pipe drilling string 2 from the central channel of the directional drilling string 1 to the bottom of the first branch hole;
step 4, the orifice rotates the running pipe 201 clockwise to separate the running pipe 201 from the screen pipe tail end positioning head 202, the running pipe 201 is withdrawn from the drill hole, the directional drilling tool string 1 is pulled back to return to the main hole, and at the moment, the screen pipe tail end positioning head 202, the screen pipe 203 and the screen pipe front end positioning head 205 are reserved in the first branch hole, so that screen pipe running of the first branch hole is completed;
step 5, adjusting the directional drilling string 1 to enable the elbow of the elbow pipe 109 to face downwards, descending the directional drilling string to the next branch hole along the main hole, and repeating the steps 2, 3 and 4, wherein the descending mode of each branch hole is the same as that of the first branch hole until all the branch holes are descended into the sieve pipe 203;
step 6, pulling back the directional drilling string 1 to return to the main hole, adjusting the directional drilling string 1 to enable the elbow of the elbow pipe 109 to face downwards, lowering the directional drilling string 1 to a position 0.4-0.5 m away from the hole bottom of the main hole along the main hole, selecting a reasonable length of the sieve tube 203 according to the depth of the main hole, enabling the length of the sieve tube 203 between the sieve tube tail end positioning head 202 and the sieve tube front end positioning head 205 to be equal to the depth of the main hole, and lowering the sieve tube drilling string 2 from the central channel of the directional drilling string 1 to the hole bottom of the main hole by using the lowering pipe 201;
and 7, clockwise rotating the running pipe 201 to separate the running pipe 201 from the screen pipe tail end positioning head 202, withdrawing the running pipe 201 from the drilled hole, pulling back the directional drilling string 1 to withdraw from the drilled hole, keeping the screen pipe tail end positioning head 202, the screen pipe 203 and the screen pipe front end positioning head 205 in the main hole, and completing the running of the screen pipe of the full-hole section of the drilled hole.
Preferably, in steps 2, 5 and 6, the orientation of the elbow of the bent pipe 109 is judged by measuring the tool facing angle with the electromagnetic wave measurement while drilling device, and when the tool facing angle is 0 °, the elbow of the bent pipe 109 faces directly above, and when the tool facing angle is 180 °, the elbow of the bent pipe 109 faces directly below.
Preferably, in steps 4, 5 and 6 of the above method, the method of determining whether the directional drill string 1 is run into the main hole or the branch hole includes: supplying air into the directional drilling tool string 1 from the hole opening, starting to measure an inclination angle, an azimuth angle and a tool facing angle by the electromagnetic wave measurement while drilling device 102, if the measured inclination angle and the measured azimuth angle are consistent with the measured inclination angle and the measured azimuth angle in the real drilling track parameters of the main hole, judging that the directional drilling tool string 1 is lowered into the main hole, and otherwise, judging that the directional drilling tool string 1 is lowered into the branch hole.
Although technical terms such as directional drilling tool string, screen pipe drilling tool string, drill pipe, electromagnetic wave measurement while drilling device, installation short section, measurement short section, power supply short section, emission control short section, armored cable, insulation short section, bent pipe, drill bit, running pipe, screen pipe end positioning head, screen pipe centralizer and screen pipe front end positioning head are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as having any additional limitation in contravention of the claimed invention.
Claims (10)
1. A screen pipe running-in device for directional drilling of broken soft coal seam gas extraction bedding comprises a directional drilling tool string (1) and a screen pipe drilling tool string (2), and is characterized in that the directional drilling tool string (1) comprises a drilling rod (101), an electromagnetic wave measurement-while-drilling device (102), a bent pipe (109) and a drill bit (110) which are sequentially connected; the screen pipe drilling string (2) comprises a lower inlet pipe (201) and a screen pipe (203) which are sequentially connected, and a screen pipe front end positioning head (205) and a screen pipe tail end positioning head (202) are respectively installed at the front end and the rear end of the screen pipe (203).
2. The screen pipe running device for directional drilling of broken soft coal seam gas extraction bedding as claimed in claim 1, wherein a screen pipe centralizer (204) is installed in the middle of the screen pipe (203).
3. The screen pipe running device for directional drilling of the broken soft coal seam gas extraction bedding as claimed in claim 1, wherein the electromagnetic wave measurement while drilling device (102) comprises a mounting pup joint (103), a measurement pup joint (104), a power supply pup joint (105), a transmission control pup joint (106) and an insulation pup joint (108); the installation short section (103) is of a non-equal-wall-thickness structure with thick two ends and thin middle part, and the outer wall of the wall-thickness part is provided with a groove for installing a measurement short section (104), a power supply short section (105) and a transmission control short section (106); the inner walls of the connecting sections of the wall thickness part of the mounting short section (103) and the wall thin parts at the two ends of the mounting short section are processed with slope angles; one end of the launch control short section (106) is communicated with the bent pipe (109) through an armored cable (107) arranged in a wire groove formed in the outer walls of the installation short section (103), the insulation short section (108) and the bent pipe (109), and the other end of the launch control short section (106) is communicated with the drill rod (101).
4. The broken soft coal seam gas extraction bedding directional drilling sieve tube running device according to claim 3, wherein a pressure detection port is arranged below the installation position of the launch control short joint (106) in the installation short joint (103).
5. The screen pipe running device for directional drilling of the broken soft coal seam gas extraction bedding as claimed in claim 1, wherein the bending angle of the elbow pipe (109) is larger than the bending angle of a screw motor used for directional drilling construction.
6. The screen pipe running device for directional drilling of broken soft coal seam gas extraction bedding as claimed in claim 1, characterized in that the length of the screen pipe (203) between the screen pipe end positioning head (202) and the screen pipe front end positioning head (205) on the screen pipe drill string (2) is equal to the length of the expected running hole protecting section.
7. The screen pipe running device for the directional drilling of the broken soft coal seam gas extraction bedding as claimed in claim 1, wherein the running pipe (201) is in reverse thread connection with a screen pipe end positioning head (202), the screen pipe end positioning head (202) is in positive thread connection with a screen pipe (203), and the screen pipe (203) is in positive thread connection with a screen pipe front end positioning head (205); the sieve tube (203) is formed by connecting two sub sieve tubes, the two sub sieve tubes are connected by adopting positive threads, and a sieve tube centralizer (204) is arranged at the joint.
8. A method for running a broken soft coal seam gas extraction bedding directional drilling sieve tube is characterized by being carried out by adopting the device for running the broken soft coal seam gas extraction bedding directional drilling sieve tube according to any one of claims 1 to 7, and comprising the following steps of:
step 1, a directional drilling tool string (1) is put in, and when the depth of a first branch hole is close, the directional drilling tool string (1) is adjusted to enable an elbow of an elbow (109) of the directional drilling tool string to face to the right upper side;
step 2, lowering the directional drilling tool string (1) to a position 0.4-0.5 m away from the bottom of the first branch hole;
step 3, selecting a screen pipe (203) according to the depth of the first branch hole, enabling the length of the screen pipe (203) between a screen pipe tail end positioning head (202) and a screen pipe front end positioning head (205) to be equal to the depth of the first branch hole, and using a running pipe (201) to run a screen pipe drilling string (2) from a central passage of the directional drilling string (1) to the hole bottom of the first branch hole;
step 4, the orifice rotates the running pipe (201) clockwise to separate the running pipe (201) from the screen pipe tail end positioning head (202), the running pipe (201) is withdrawn from the drill hole, the directional drilling string (1) is pulled back to return to the main hole, and at the moment, the screen pipe tail end positioning head (202), the screen pipe (203) and the screen pipe front end positioning head (205) are retained in the first branch hole to finish the screen pipe running of the first branch hole;
step 5, adjusting the directional drilling tool string (1) to enable the elbow of the elbow pipe (109) to face downwards, descending the elbow pipe to the next branch hole along the main hole, and repeating the steps 2, 3 and 4, wherein the descending mode of each branch hole is the same as that of the first branch hole until all the branch holes are descended into the sieve pipe (203);
step 6, pulling back the directional drilling string (1) to return to the main hole, adjusting the directional drilling string (1) to enable the elbow of the elbow pipe (109) of the directional drilling string to face downwards, lowering the directional drilling string (1) to a position 0.4-0.5 m away from the hole bottom of the main hole along the main hole, selecting a reasonable length of the sieve tube (203) according to the depth of the main hole, enabling the length of the sieve tube (203) between the tail end positioning head (202) of the sieve tube and the front end positioning head (205) of the sieve tube to be equal to the depth of the main hole, and lowering the sieve tube drilling string (2) to the hole bottom of the main hole from a central channel of the directional drilling string (1) by using a lowering pipe (201);
and 7, clockwise rotating the running pipe (201) to separate the running pipe (201) from the screen pipe tail end positioning head (202), withdrawing the running pipe (201) from the drilled hole, and pulling back the directional drilling string (1) to withdraw from the drilled hole, so that the screen pipe tail end positioning head (202), the screen pipe (203) and the screen pipe front end positioning head (205) are remained in the main hole, and the screen pipe running of the full-hole section of the drilled hole is completed.
9. The screen pipe running method for directional drilling of the broken soft coal seam gas extraction bedding as claimed in claim 8, wherein in the steps 2, 5 and 6, the orientation of the elbow pipe (109) is judged by measuring the tool facing angle through an electromagnetic wave measurement while drilling device, when the tool facing angle is 0 °, the elbow of the elbow pipe (109) is oriented directly above, and when the tool facing angle is 180 °, the elbow of the elbow pipe (109) is oriented directly below.
10. The method for running the directional drilling screen pipe in the broken soft coal seam gas extraction bedding of claim 8, wherein in the steps 4, 5 and 6, the method for judging whether the directional drilling tool string 1 runs into the main hole or the branch hole comprises the following steps: supplying air into the directional drilling tool string (1) from the hole opening, starting to measure an inclination angle, an azimuth angle and a tool facing angle by the electromagnetic wave measurement while drilling device (102), judging that the directional drilling tool string (1) is lowered into the main hole if the measured inclination angle and the measured azimuth angle are consistent with the measured inclination angle and the measured azimuth angle in the actual drilling track parameters, and otherwise, judging that the directional drilling tool string (1) is lowered into the branch hole.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114837630A (en) * | 2022-05-26 | 2022-08-02 | 中煤科工集团西安研究院有限公司 | Coal mine underground broken soft coal seam directional long drilling fast screening system and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998009054A1 (en) * | 1996-08-30 | 1998-03-05 | Baker Hughes Incorporated | Cement reinforced inflatable seal for a junction of a multilateral |
| US20140196953A1 (en) * | 2001-08-19 | 2014-07-17 | James E. Chitwood | Drilling apparatus |
| CN106014351A (en) * | 2016-02-17 | 2016-10-12 | 中国石油集团渤海钻探工程有限公司 | Method for accurately and rapidly lowering screen pipe in horizontal multilateral borehole |
| CN110306934A (en) * | 2019-07-02 | 2019-10-08 | 中煤科工集团西安研究院有限公司 | The construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes |
| US20200200004A1 (en) * | 2017-10-12 | 2020-06-25 | China University Of Mining And Technology | Measurement-while-drilling method and device for assessing outburst risk of coal seam |
| CN111764872A (en) * | 2020-07-07 | 2020-10-13 | 中煤科工集团西安研究院有限公司 | Coal mine underground top and bottom plate comb-shaped branch hole pipe flying construction drilling tool and construction method |
| AU2021100936A4 (en) * | 2021-02-19 | 2021-04-29 | China Coal Technology Engineering Group Chongqing Research Institute | Process of putting screen pipe in directionally drilled branch hole of soft coal seam |
| CN113062692A (en) * | 2021-03-15 | 2021-07-02 | 中煤科工集团西安研究院有限公司 | Short-distance multi-branch sidetrack drilling tool and drilling method for coal mine underground directional hole |
-
2021
- 2021-12-22 CN CN202111577206.7A patent/CN114412423A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998009054A1 (en) * | 1996-08-30 | 1998-03-05 | Baker Hughes Incorporated | Cement reinforced inflatable seal for a junction of a multilateral |
| US20140196953A1 (en) * | 2001-08-19 | 2014-07-17 | James E. Chitwood | Drilling apparatus |
| CN106014351A (en) * | 2016-02-17 | 2016-10-12 | 中国石油集团渤海钻探工程有限公司 | Method for accurately and rapidly lowering screen pipe in horizontal multilateral borehole |
| US20200200004A1 (en) * | 2017-10-12 | 2020-06-25 | China University Of Mining And Technology | Measurement-while-drilling method and device for assessing outburst risk of coal seam |
| CN110306934A (en) * | 2019-07-02 | 2019-10-08 | 中煤科工集团西安研究院有限公司 | The construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes |
| CN111764872A (en) * | 2020-07-07 | 2020-10-13 | 中煤科工集团西安研究院有限公司 | Coal mine underground top and bottom plate comb-shaped branch hole pipe flying construction drilling tool and construction method |
| AU2021100936A4 (en) * | 2021-02-19 | 2021-04-29 | China Coal Technology Engineering Group Chongqing Research Institute | Process of putting screen pipe in directionally drilled branch hole of soft coal seam |
| CN113062692A (en) * | 2021-03-15 | 2021-07-02 | 中煤科工集团西安研究院有限公司 | Short-distance multi-branch sidetrack drilling tool and drilling method for coal mine underground directional hole |
Non-Patent Citations (1)
| Title |
|---|
| 谭天宇、李浩 等: "煤层气多分支水平井分支井眼重入筛管完井技术", 《石油钻探技术》, vol. 40, no. 4, pages 78 - 82 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114837630A (en) * | 2022-05-26 | 2022-08-02 | 中煤科工集团西安研究院有限公司 | Coal mine underground broken soft coal seam directional long drilling fast screening system and method |
| CN114837630B (en) * | 2022-05-26 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Quick screen pipe feeding system and method for directional long drilling of underground crushed soft coal layer of coal mine |
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