CN114753792B - Rope coring well track monitoring device - Google Patents
Rope coring well track monitoring device Download PDFInfo
- Publication number
- CN114753792B CN114753792B CN202210531614.7A CN202210531614A CN114753792B CN 114753792 B CN114753792 B CN 114753792B CN 202210531614 A CN202210531614 A CN 202210531614A CN 114753792 B CN114753792 B CN 114753792B
- Authority
- CN
- China
- Prior art keywords
- coring
- inclinometer
- section
- inclinometer assembly
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012806 monitoring device Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 230000005484 gravity Effects 0.000 claims description 21
- 238000005553 drilling Methods 0.000 description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 10
- 239000003245 coal Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a track monitoring device for a rope coring well, which belongs to the technical field of rope coring equipment and comprises a coring outer barrel, a steel cable, an inclinometer assembly and a positioning device, wherein the positioning device is in threaded fit with the coring outer barrel, the inclinometer assembly is arranged on the positioning device, the inclinometer assembly is hoisted into the coring outer barrel through the steel cable, and the steel cable is connected with traction equipment on the ground.
Description
Technical Field
The invention relates to the technical field of wire-line coring equipment, in particular to a wire-line coring well track monitoring device.
Background
The well track is an important index for checking the quality of the well, and in the drilling construction, the well drilling parameters are optimized through the analysis result of the well track monitoring data, and the drilling tool assembly and the well drilling process are adjusted so as to realize that the quality of the well reaches the design requirement.
In recent years, along with the vigorous development of the coalbed methane project, the drilling traffic of the coalbed methane is in an ascending trend, the drilling construction of the coalbed methane is also normalized, and the well quality relates to a series of important production problems such as later drainage and production scale and the like, so the drilling quality is an important basic parameter in the exploration and development of the coalbed methane. The coalbed methane drilling is different from petroleum drilling, requires a coal core to put out a shaft in a specified time, and can sealing is used for desorbing the gas production condition of the coal core to obtain real and accurate coalbed methane content data, and is one of important bases for later development and deployment. Therefore, the wire line coring technique is widely applied to the coal bed methane drilling construction.
The operating principle of wire coring belongs to double-barrelled single-action coring tool, get into the shaft bottom through the drill stem internal diameter and get into the urceolus with throwing type before the coring drilling, pass through the seat ring and inject the position of getting into the core inner tube, when the core inner tube sits in the urceolus seat ring of getting into the core, get into core inner tube jump ring mechanism and pop out, keep the core inner tube to go into the core mouth and have certain clearance with the urceolus core bit of getting into when making the core drilling not receive the core thrust to go upward, the bearing cluster part of core inner tube suspension mechanism has realized that the urceolus is along with the radial rotation of drilling tool in the core drilling process, the core inner tube is not changeed and is kept axial motion with stratum rock core, guarantee to get into the core inner tube smoothly in the core drilling, not receive drilling fluid to wash out and keep the rock core integrality.
The single-point inclinometer is connected with the steel cable, the instrument is lowered to the bottom of the well through the inner diameter of the drill rod by using a winch to measure, and the inclinometer is pulled out of the wellhead to read the measurement result after the measurement result is obtained. The single-point inclinometry is carried out under the condition that the coring inner barrel is arranged in the drilling tool, the coring inner barrel salvaging mechanism is easily damaged in the inclinometer device lowering process, the coring inner barrel salvaging fault is caused, the rock core cannot be timely lifted out of the shaft, the stratum data is inaccurate, the gas content desorption data is distorted, and the drilling significance is lost. The inclinometer directly enters the bottom of the well to contact the stratum through the coring outer barrel under the condition of no coring inner barrel in the drilling tool, and the inclinometer string which is lowered in the softer stratum is easily embedded into the stratum, so that the inclinometer cannot be smoothly pulled out, and even if a steel cable is cut and a drill is forcibly pulled out, the inclinometer can be left at the bottom of the well, so that serious well accidents are caused.
The Chinese patent publication No. CN1049542A discloses a rope core drill, and the technical scheme of the invention is as follows: according to the principle that when the hollow cylindrical elastic body is axially pressed and deformed, if the diameter deformation is the same, the axial pressure is inversely proportional to the axial length of the deformed part of the elastic body, a longer elastic body and a sleeve with the inner diameter slightly larger than the outer diameter of the elastic body are used for adjusting the position of the sleeve, so that the elastic body part enters the sleeve or completely exits from the sleeve, the length of a free surface of the elastic body which can generate radial deformation is adjusted, and the needed pressure is changed, so that the regulation of the core blocking signaling pressure is realized, but the invention can not realize the inclination measurement in the process of rope coring, thus the time cost is increased, and therefore, the rope coring borehole track monitoring device is invented aiming at the defect.
Disclosure of Invention
To the above technical problem, a rope coring wellbore trajectory monitoring device includes: the wire rope type core taking device comprises a core taking outer barrel, a wire rope, an outer barrel seat ring and an inclinometer assembly, wherein the core taking outer barrel is formed by connecting four sections of steel pipes, the axial direction of the core taking outer barrel is the gravity direction in the working state, and the outer barrel seat ring is connected with the inner wall of the core taking outer barrel through threads; the inclinometer assembly is coaxial with the coring outer cylinder, the inclinometer assembly is formed by connecting four sections of rods, the upper end face of the uppermost section of the inclinometer assembly is connected with a steel cable, and a positioning tray is fixedly arranged on the outer surface of a third section of rod of the inclinometer assembly along the gravity direction.
Further, the four sections of steel pipes of the coring outer barrel are connected through threads, and a working drill bit is connected below the fourth section of steel pipe of the coring outer barrel along the gravity direction.
Further, the junction of the second section and the third section of the coring outer barrel along the gravity direction is connected with the outer barrel seat ring through threads.
Further, four sections of rods of the inclinometer assembly are connected through threads.
Further, the inclinometer assembly be provided with the rectangle recess along the second section pole surface of gravity direction, be equipped with the inclinometer in the rectangle recess of inclinometer assembly, the inclinometer assembly be provided with the hole along the third section pole surface of gravity direction, the inclinometer assembly be provided with the water course along the inside of the third and fourth section pole of gravity direction, the inclinometer assembly be the wedge along the fourth section pole surface lower extreme of gravity direction.
Further, the water channel in the third inner part of the inclinometer assembly along the gravity direction is coaxial with the coring outer cylinder, the hole of the inclinometer assembly is communicated with the water channel, and the hole of the inclinometer assembly is positioned above the positioning tray.
Further, the upper side of the outer cylinder seat ring is provided with an inclined plane of 8 degrees of the coring outer cylinder, the outer cylinder seat ring is provided with a through hole, the through hole of the outer cylinder seat ring and the coring outer cylinder are coaxial, and the diameter of the through hole of the outer cylinder seat ring is larger than the diameters of a third section rod and a fourth section rod of the inclinometer assembly along the gravity direction.
Furthermore, the lower side of the positioning tray is also provided with an inclined plane, the inclined angle of the inclined plane of the lower side of the positioning tray is the same as that of the inclined plane of the outer cylinder seat ring, the positioning tray is provided with a through hole, the through hole of the positioning tray is coaxial with the through hole of the outer cylinder seat ring, and the inclinometer assembly is fixedly arranged in the through hole of the positioning tray.
Further, the second section of the rod of the inclinometer assembly along the gravity direction is made of a non-magnetic material.
Compared with the prior art, the invention has the beneficial effects that: (1) The problem that inclination measurement cannot be carried out in the process of continuously coring a section in a huge thick coal seam is solved; (2) The occurrence of shaft accidents caused by the fact that the inclinometer directly falls into the bottom of a well in the inclinometer process is avoided; (3) The upper part of the inclinometer rod piece guide shoe is connected with the positioning tray, and a diversion water channel is designed, so that under special conditions, the pit shaft internal circulation is established through the diversion water channel; (4) If the complex condition in the well appears in the inclinometry process, the time is not enough to bring the inclinometer out of the well bottom, the connecting steel cable can be cut off, the circulation of the upper kelly can be recovered as soon as possible, after the complex condition is relieved, the inclinometer can be lifted to the ground along with the drilling tool after the drilling, and the accident in the well of leaving the inclinometer can not be caused.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention.
Fig. 2 is a partially enlarged schematic view of fig. 1 at a.
Fig. 3 is a partially enlarged schematic view of fig. 1 at B.
Fig. 4 is an enlarged partial schematic view of fig. 1 at C.
FIG. 5 is a schematic diagram of the connection between the inclinometer assembly and the positioning device of the present invention.
Reference numerals: 1-coring an outer barrel; 2-a steel rope; 3-inclinometer assembly; 4-positioning means; 301-hanging a head; 302-instrument bin; 303-weight bar; 304-a shoe-guiding rod; 401-positioning a tray; 402-outer cylinder seat ring.
Detailed Description
The technical scheme of the invention is further described in the following by combining with the specific embodiments.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
As shown in fig. 1: the locating device 4 and the coring outer barrel 1 form threaded fit, the inclinometer assembly 3 is arranged on the locating device 4, the inclinometer assembly 3 is suspended in the coring outer barrel 1 through the steel cable 2, and the steel cable 2 is connected with traction equipment on the ground.
As shown in fig. 1 to 5: the inclinometer assembly 3 is provided with a suspension head 301, an instrument bin 302, a weighting rod 303 and a shoe guide rod 304, two adjacent ends are connected through threads, the suspension head 301, the instrument bin 302, the weighting rod 303 and the shoe guide rod 304 are coaxial, the instrument bin 302 and the coring outer barrel 1 are coaxial, the coring outer barrel 1 is formed by connecting four sections of steel pipes, the connection part between each group of adjacent steel pipes of the coring outer barrel 1 is in threaded connection, and the lowest steel pipe is connected with a working drill bit.
As shown in fig. 1, fig. 2 and fig. 5: the upper end fixedly connected with cable wire 2 hangs first 301, instrument storehouse 302 surface is provided with the rectangle hole, install inclinometer in the rectangle hole, instrument storehouse 302 adopts non-magnetic material, instrument storehouse 302 rectangle hole lower extreme face is 45m with the distance of hanging first 301 upper surface, it is provided with circular hole to weigh the outer surface of pole 303, it is provided with the water course to weigh the inside of pole 303 and guide shoe pole 304, it is communicated with the water course to weigh the hole of pole 303, it is located location tray 401 top to weigh the hole of pole 303 surface, location tray 401 is provided with the through-hole, fixed mounting is in the location tray 401 through-hole and is aggravates pole 303, guide shoe pole 304 surface lower extreme is the wedge.
As shown in fig. 1 and 2: the coring outer barrel 1 is connected with the outer barrel seat ring 402 through threads at the joint of the second section and the third section along the gravity direction, an inclined plane of the coring outer barrel of 18 degrees is arranged on the upper side of the outer barrel seat ring 402, a through hole is formed in the outer barrel seat ring 402, the through hole of the outer barrel seat ring 402 is coaxial with the coring outer barrel 1, the diameter of the through hole of the outer barrel seat ring 402 is larger than that of the shoe leading rod 304, an inclined plane is also formed on the lower side of the positioning tray 401, the inclined plane of the lower side of the positioning tray 401 is the same as the inclined plane of the outer barrel seat ring 402, and the through hole of the positioning tray 401 is coaxial with the through hole of the outer barrel seat ring 402.
Working principle: the inclinometer assembly 3 is placed into the coring outer barrel 1 through the steel cable 2 in the rope coring process gap, when the inclined plane at the lower end of the shoe guide rod 304 contacts with the inclined plane above the outer barrel seat ring 402, the shoe guide rod 304 slides along the inclined plane of the outer barrel seat ring 402 and then falls into the through hole of the outer barrel seat ring 402, when the inclined plane below the positioning tray 401 contacts with the inclined plane above the outer barrel seat ring 402 after a certain distance is placed, the positioning tray 401 is clamped by the outer barrel seat ring 402, and then the inclinometer in the rectangular hole of the instrument bin 302 starts to work, so that the inclinometer is realized, accidents caused by the fact that the inclinometer falls into the bottom of the well when the inclinometer is directly placed into the bottom of the well are avoided, when the coring and inclinometer processes cannot be carried out due to the complex condition of the bottom of the well, the steel cable 2 is directly broken, and the coring outer barrel 1 and the inclinometer assembly 3 are simultaneously taken out when the complex condition of the bottom of the well is to be eliminated, and accidents caused by the inclinometer falling into the bottom of the well due to the complex condition of the bottom of the well are prevented.
Claims (5)
1. A wireline coring wellbore trajectory monitoring device, comprising: coring urceolus (1), cable wire (2), its characterized in that still includes: the core taking outer barrel (1) is formed by connecting four sections of steel pipes, the axial direction of the core taking outer barrel (1) is in the gravity direction in the working state, and the outer barrel seat ring (402) is connected with the inner wall of the core taking outer barrel (1) through threads; the inclinometer assembly (3) is coaxial with the coring outer cylinder (1), the inclinometer assembly (3) is formed by connecting four sections of rods, the upper end surface of the uppermost section of the inclinometer assembly (3) is connected with a steel cable (2), a positioning tray (401) is fixedly arranged on the outer surface of the third section of rod in the gravity direction of the inclinometer assembly (3), an inclined surface is arranged on the upper side of the outer cylinder seat ring (402), a through hole is arranged on the outer cylinder seat ring (402), the through hole of the outer cylinder seat ring (402) is coaxial with the coring outer cylinder (1), the diameter of the through hole of the outer cylinder seat ring (402) is larger than that of the third section of rod and the diameter of the fourth section of rod in the gravity direction of the inclinometer assembly (3), an inclined surface is also arranged on the lower side of the positioning tray (401), the inclined angle of the inclined surface of the lower side of the positioning tray (401) is the same as that of the inclined surface of the outer cylinder seat ring (402), the positioning tray (401) is provided with an inclined surface, the through hole is arranged on the inner surface of the inclinometer assembly (3) along the direction of the second section of the inclinometer assembly (3), the inclined surface of the inclinometer assembly (3) is provided with a rectangular through hole, the inclinometer assembly (3) is arranged on the outer surface of the inclinometer assembly (3 along the direction of the through hole, the outer surface of the third section of rod of the inclinometer assembly (3) along the gravity direction is provided with a hole, the interiors of the third section of rod and the fourth section of rod of the inclinometer assembly (3) along the gravity direction are provided with water channels, and the lower end of the outer surface of the fourth section of rod of the inclinometer assembly (3) along the gravity direction is wedge-shaped.
2. A wire-line coring borehole trajectory monitoring device as set forth in claim 1 wherein: the four sections of steel pipes of the coring outer barrel (1) are connected in a threaded mode, and a working drill bit is connected below the fourth section of steel pipe of the coring outer barrel (1) along the gravity direction.
3. A wire-line coring borehole trajectory monitoring device according to claim 2, wherein: the coring outer barrel (1) is connected with the outer barrel seat ring (402) through threads at the joint of the second section and the third section along the gravity direction.
4. A wire-line coring borehole trajectory monitoring device as set forth in claim 1 wherein: four sections of rods of the inclinometer assembly (3) are connected through threads.
5. A wire-line coring borehole trajectory monitoring device as set forth in claim 4 wherein: the water channel in the third inner part of the inclinometer assembly (3) along the gravity direction is coaxial with the coring outer cylinder (1), the hole of the inclinometer assembly (3) is communicated with the water channel, and the hole of the inclinometer assembly (3) is positioned above the positioning tray (401).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210531614.7A CN114753792B (en) | 2022-05-17 | 2022-05-17 | Rope coring well track monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210531614.7A CN114753792B (en) | 2022-05-17 | 2022-05-17 | Rope coring well track monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114753792A CN114753792A (en) | 2022-07-15 |
| CN114753792B true CN114753792B (en) | 2024-05-31 |
Family
ID=82334554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210531614.7A Active CN114753792B (en) | 2022-05-17 | 2022-05-17 | Rope coring well track monitoring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114753792B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118164215B (en) * | 2024-04-08 | 2024-09-06 | 绍兴市金泽电子科技有限公司 | Cargo transportation system between factory areas |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672170A (en) * | 2009-09-01 | 2010-03-17 | 中国地质大学（北京） | A new electric directional coring device |
| CN101709625A (en) * | 2009-10-28 | 2010-05-19 | 华北有色工程勘察院有限公司 | Vertical drilling scopperil eccentric slope-correcting method |
| CN208845167U (en) * | 2018-09-12 | 2019-05-10 | 四川省地质工程勘察院 | A kind of inclinometer reconnoitred for creep deformation stage sliding surface |
| CN209277837U (en) * | 2018-12-19 | 2019-08-20 | 长安大学 | A kind of flexible cable inclinometer detector fishing device based on low-resistance |
| CN111364976A (en) * | 2020-04-02 | 2020-07-03 | 中国铁建重工集团股份有限公司 | Horizontal core drill inclined plane drill bit position recognition device and system |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8162080B2 (en) * | 2007-09-25 | 2012-04-24 | Baker Hughes Incorporated | Apparatus and methods for continuous coring |
| US9822638B2 (en) * | 2013-09-30 | 2017-11-21 | 1464684 Alberta Ltd. | In-situ rock testing tool |
-
2022
- 2022-05-17 CN CN202210531614.7A patent/CN114753792B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672170A (en) * | 2009-09-01 | 2010-03-17 | 中国地质大学（北京） | A new electric directional coring device |
| CN101709625A (en) * | 2009-10-28 | 2010-05-19 | 华北有色工程勘察院有限公司 | Vertical drilling scopperil eccentric slope-correcting method |
| CN208845167U (en) * | 2018-09-12 | 2019-05-10 | 四川省地质工程勘察院 | A kind of inclinometer reconnoitred for creep deformation stage sliding surface |
| CN209277837U (en) * | 2018-12-19 | 2019-08-20 | 长安大学 | A kind of flexible cable inclinometer detector fishing device based on low-resistance |
| CN111364976A (en) * | 2020-04-02 | 2020-07-03 | 中国铁建重工集团股份有限公司 | Horizontal core drill inclined plane drill bit position recognition device and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114753792A (en) | 2022-07-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111140173B (en) | Horizontal directional core drilling straightening and deviation correcting drilling tool and drilling method | |
| CA1071529A (en) | Method and apparatus for running and retrieving logging instruments in highly deviated well bores | |
| US11746597B2 (en) | Pressured horizontal directional drilling continuous coring device for engineering geological investigation | |
| CN106677701A (en) | Engineering geological drilling construction method based on thin-walled drilling tool | |
| US11643895B2 (en) | Sealed pressured horizontal directional drilling continuous coring device for engineering geological investigation | |
| CN103603625A (en) | Casing coring drilling tool and casing coring drilling method | |
| CN112593882B (en) | Rope directional coring drilling device with composite function | |
| CN102155178A (en) | Large-diameter coalbed methane core drill bit | |
| CN114753792B (en) | Rope coring well track monitoring device | |
| CN102296950B (en) | Hydraulic shearing type sampling drilling tool | |
| CN112112575B (en) | Garrulous soft coal seam airtight coring bit suitable for ground drilling | |
| CN203570241U (en) | Casing coring drilling tool | |
| CN204312004U (en) | Novel gas well drift size gauge tool | |
| CN110094162A (en) | A kind of drilling equipment and boring method of the pack hole for mine capital construction construction | |
| CN111636838B (en) | Complex stratum double-isolation self-locking type three-layer pipe rope core drilling tool | |
| CN109505582A (en) | A kind of idler wheel flexible nipple | |
| CN107916891B (en) | Drilling method suitable for 26-inch guide pipe single-cylinder double wells | |
| CN201714317U (en) | Down-the-hole drilling rig centering device | |
| CN204804733U (en) | Spindle drift size tool | |
| CN100575659C (en) | A kind of insufficient balance well completion method | |
| CN209385110U (en) | A kind of idler wheel flexible nipple | |
| CN2381771Y (en) | Coring device for gas exploration in coal bed | |
| US2769615A (en) | Core recovery apparatus | |
| CN207813499U (en) | A kind of deep sea drill being equipped with reducing core sampling drilling rod power head | |
| CN115577648A (en) | Pipe column friction resistance calculation method and system for constant-pressure radial hydraulic drilling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |