CN112112588B - Press-in type rope coring drilling tool and coring process method thereof - Google Patents
Press-in type rope coring drilling tool and coring process method thereof Download PDFInfo
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- CN112112588B CN112112588B CN202010936162.1A CN202010936162A CN112112588B CN 112112588 B CN112112588 B CN 112112588B CN 202010936162 A CN202010936162 A CN 202010936162A CN 112112588 B CN112112588 B CN 112112588B
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- 238000005553 drilling Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000007789 sealing Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 239000000725 suspension Substances 0.000 claims description 10
- 230000002512 anti-withdrawal effect Effects 0.000 claims description 8
- 241001449342 Chlorocrambe hastata Species 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 239000013535 sea water Substances 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000002146 bilateral effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000017740 grade III prostatic intraepithelial neoplasia Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 239000002344 surface layer Substances 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
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
-
- 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
- E21B25/18—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being specially adapted for operation under water
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- 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)
- Earth Drilling (AREA)
Abstract
A pressing-in type rope core drilling tool and a core drilling process method thereof, wherein the pressing-in type rope core drilling tool comprises an outer assembly and an inner assembly, the inner assembly is arranged in the outer assembly during core drilling operation, and an annular structure is formed between the inner assembly and the outer assembly; the outer assembly is internally provided with a seat ring and a sealing outer tube, and the lower part of the sealing outer tube is provided with a pressure relief groove; the inner assembly is provided with a fixed part and a piston type moving part sleeved outside the fixed part, during coring operation, high-pressure slurry is injected into an annular structure formed between the inner assembly and the outer assembly through a water pump arranged on a drilling platform surface, and the piston type moving part is pushed by slurry pressure to shear a pin shaft and then move downwards, so that an inner drill bit is flushed into a weak stratum and a core is obtained in an inner pipe assembly. According to the invention, through the optimized design of the rope core drilling tool structure, a process method for obtaining the soft stratum core in a piston pressing mode is innovated, and the purposes of improving the core taking quality and the core taking rate are achieved.
Description
Technical Field
The invention relates to a rope coring drilling tool and a coring process method thereof, in particular to a press-in type rope coring drilling tool suitable for a weak stratum and a coring process method thereof.
Background
The drilling coring is a technology of drilling holes in a stratum and obtaining a core through drilling equipment and a drilling tool, and the currently common drilling coring method is rotary drilling, namely, a drilling machine top drive drives the drilling tool to rotate, and the stratum at the bottom of a hole is ground and scored through the drilling tool to drill. In the drilling process, the temperature of the drill bit is reduced through the circulation of drilling fluid, rock scraps are carried out of the drilled holes, and meanwhile, a core column gradually enters the core tube until the drilling time is over.
Because the currently adopted drilling method is designed aiming at rock stratum, the method is not suitable for drilling and coring operations in weak stratum such as silt, silt and the like with higher superficial water content in oceans and rivers and lakes, when the weak stratum is cored, the stratum structure in the rock core is changed due to disturbance of rotation of a drill bit, and the rock core is easily washed by circulating drilling fluid, so that the obtained rock core has the problems of larger disturbance, low coring quality, substandard rock core sampling rate and the like when approaching to a terminal point. Especially in shallow region geological exploration of ocean, often because the core sampling rate is not up to standard and causes the missing stratum more, the coring task can't be accomplished. In conclusion, the rotary drilling coring method with mud circulation has serious damage to the core of the weak stratum, and is difficult to be applied to the shallow surface layer coring drilling process in the sea and river lakes.
Disclosure of Invention
The invention provides a press-in type rope coring drilling tool and a coring process method thereof, and aims to achieve the aim of improving core taking quality and core taking rate by optimally designing the structure of the rope coring drilling tool and matching with a process method for obtaining a weak stratum core in a piston press-in mode.
In order to achieve the above purpose, the invention adopts the following technical scheme:
A press-in rope core drilling tool comprises an outer assembly and an inner assembly, wherein the inner assembly is arranged in the outer assembly during core drilling operation, and an annular structure is formed between the inner assembly and the outer assembly; the outer assembly is internally provided with a seat ring and a sealing outer tube, and the lower part of the sealing outer tube is provided with a pressure relief groove; the inner assembly is provided with a fixing part and a piston type moving part sleeved outside the fixing part, the fixing part comprises a spearhead component, a hanging ring, a connecting shaft and a mandrel, the spearhead component is connected with the mandrel through the connecting shaft, the hanging ring is sleeved on the connecting shaft, the inner assembly is mounted on a seat ring of the outer assembly through the hanging ring, the piston type moving part is fixed on the connecting shaft through a pin shaft before coring operation, a flange piston tightly attached to a sealed outer tube in the outer assembly is arranged in the piston type moving part, an inner drill bit is arranged at the lower end of the piston type moving part, during coring operation, high-pressure slurry is injected into an annular structure between the inner assembly and the outer assembly through a water pump arranged on a drilling table surface, and the piston type moving part is pushed to cut the pin shaft through slurry pressure to move downwards, so that the inner drill bit is pushed into a weak stratum and a core bit is acquired in the inner pipe component.
The piston type moving part comprises a piston assembly, an inner pipe assembly and an inner drill bit; the piston assembly comprises a flange piston, a piston seat, a slip ring sleeve, a half slip ring and a shear pin sleeve, wherein the shear pin sleeve, the half slip ring, the slip ring sleeve and the piston seat are sequentially connected from top to bottom, sealing elements are arranged on the inner walls of the slip ring sleeve and the piston seat, a pin shaft hole is formed in the shear pin sleeve, the pin shaft is arranged in the pin shaft hole and penetrates through the connecting shaft, and the flange piston is embedded between the piston seat and the slip ring sleeve; an inner tube assembly and an inner drill bit are mounted below the piston assembly.
The press-in rope core drilling tool comprises an upper mandrel and a lower mandrel, wherein a clamping groove is formed in the connecting part of the upper mandrel and the lower mandrel, and a liner tube piston is arranged at the lower end of the lower mandrel.
Above-mentioned push-in type rope coring drilling tool, the piston subassembly still is equipped with prevents moving back the mechanism, prevent moving back the mechanism and including preventing moving back key and torsional spring, prevent moving back key bilateral symmetry and arrange two sets of to articulated mode and cut the pin cover assembly, and cut the pin cover and prevent moving back the torsional spring of installation between the key articulated shaft, after the operation of coring is accomplished, move back the key and go up dabber, lower dabber junction position draw-in groove's cooperation and carry out spacingly to the piston subassembly.
Above-mentioned push-in rope coring drilling tool, piston formula moving part still is equipped with quick detach mechanism, quick detach mechanism includes the quick detach endotheca and the quick detach overcoat of mutually supporting, wherein quick detach endotheca upper end and the piston seat assembly of piston assembly, quick detach overcoat lower extreme and inner tube assembly.
The inner pipe assembly comprises a pressure release joint, an inner pipe and a transparent PC liner pipe; the upper end of the inner tube is connected with the quick-release outer sleeve through the pressure relief joint, the lower end of the inner tube is connected with the inner drill bit, and the transparent PC bushing is embedded in the inner tube and the inner cavity of the inner drill bit.
Above-mentioned push-in rope coring drilling tool be equipped with big relief hole on the pressure release joint lateral wall be equipped with little relief hole on the quick detach overcoat lateral wall, realize the control to the piston type motion part when being close to the terminal point through big relief hole, little relief hole and the cooperation of the bushing pipe piston of installing in lower dabber lower extreme.
The pressing-in type rope coring process method adopts the pressing-in type rope coring drilling tool to realize the drilling and coring operation of weak stratum, and comprises the following operation steps:
a. After the last coring operation is finished, sweeping the hole, lifting the drilling tool away from the bottom of the hole by a certain distance, fixing the drill stem on the drilling floor surface through the hole clamp holder, and lifting the assembled inner assembly by the cooperation of the top drive and the fisher and placing the inner assembly into the drill stem from the hole;
b. The inner assembly is lowered into the outer assembly by the rope coring winch, so that the inner assembly suspension ring is pressed on the outer assembly seat ring, and the wire rope of the coring winch is slightly released, so that the wire rope is not in a tightening state;
c. closing the center Kong Jiaosai of the top drive water tap to enable the rubber plug to squeeze the rope core-taking steel wire rope, opening a lifting compensation system of the top drive, lowering a drilling tool by the top drive under the cooperation of a rope core-taking winch, and clamping and fixing a drill string through a sea base disc clamp holder;
d. The pump is started to feed water, a flange piston in the inner assembly generates downward thrust under the action of mud pressure, the pin shaft is sheared through the pin shearing sleeve, the inner pipe is driven to punch out downwards, the inner drill bit enters a weak stratum to obtain a core sample, when the flange piston moves to a position for sealing a decompression groove of the outer pipe, the mud pressure is reduced, and the secondary coring process is finished;
e. opening a sea base disc clamp holder, lifting a top drive and a drilling tool, flushing an inner pipe of a stratum to leave the bottom of a hole under the drive of a base ring in an outer assembly, opening a top drive water tap center Kong Jiaosai, and lifting the inner assembly through a rope coring winch;
f. The drill hole clamp holder is used for fixing the drill pipe column on the drill floor, the top drive is disconnected with the drill pipe column, the inner assembly lifted to the drill hole is placed on a base plate of the drill hole, the drill hole clamp holder is divided into an upper part and a lower part through the inner assembly quick detaching mechanism, the upper part and the lower part are respectively taken out through the fisher, and the transparent PC liner tube in the inner pipe is pulled out to finish a coring operation;
g. the inner assembly is reassembled for standby, the top drive is connected with the drill string to sweep the hole, the part of the drill hole from which the core is obtained is swept, and then the steps can be repeated to enter the next working cycle.
In the above-mentioned pressed-in rope coring process method, in the step c, after the drilling tool is lowered to the bottom of the outer drill bit contact drilling hole, the ocean heave height is continuously lowered, then the sea base plate is operated, and the drill string is clamped and fixed by the sea base plate clamp.
In the above-mentioned push-in rope coring process method, in step d, when the inner pipe assembly begins coring, the sea water that gets into between dabber and the inner pipe is discharged through the big relief hole of pressure release joint, when piston running part is moved to the stroke and is about to be ended under mud promotion, the bushing pipe piston covers big relief hole, and big relief hole inefficacy this moment, the last little relief hole of quick detach overcoat continues to lead to water pressure release to control flange piston upper and lower pressure differential, avoids leading to the striking of bushing pipe piston and quick detach endotheca because of piston running part is too fast.
The press-in rope coring drilling tool seals the flange piston, the sealing outer tube and the mandrel to form a sealing cavity similar to an oil cylinder, so that the inner assembly of the drilling tool can press an inner drill bit into a stratum to obtain a rock core under the pushing of mud pressure; the press-in type rope core drilling tool is further provided with the quick disassembly mechanism in the inner assembly, so that the inner assembly can be quickly disassembled and assembled in the orifice, the disassembly and assembly operation difficulty is reduced, the requirement on the clearance height of equipment is lowered, and the labor intensity of operators is also reduced. Compared with the traditional rotary drilling and percussion drilling process, the press-in type rope coring process has the advantages that the inner pipe is directly pressed into the stratum, and the influence of slurry on the rock core is avoided in a lead pressing-in mode, so that the rock core protection effect is excellent, and the press-in type rope coring process has a good use effect particularly for weak strata such as seabed silt. Therefore, the invention innovates a process method for obtaining the soft stratum core by a piston pressing-in mode through the optimized design of the rope core drilling tool structure, and achieves the purpose of improving the core taking quality and the core taking rate.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a press-in rope coring drilling tool;
FIG. 2 is a schematic view of the outer assembly structure of the press-in rope core drill;
FIG. 3 is an enlarged view at A in FIG. 2;
FIG. 4 is a schematic view of the internal assembly structure of the press-in rope core drill;
FIG. 5 is a schematic illustration of the stationary components in the inner assembly of the push-in rope core drill;
FIG. 6 is a schematic view of the piston type moving parts in the inner assembly of the press-in rope coring drilling tool;
FIGS. 7 and 8 are schematic diagrams illustrating the movement of a piston type moving part in an inner assembly of a press-in type rope core drill;
FIG. 9 is an enlarged view of the structure at B in FIG. 8;
Fig. 10 is a schematic diagram of the coring process of the press-in rope coring drilling tool.
The list of the reference numerals in the drawings is:
1. 1-1 parts of outer assembly, 1-2 parts of seat ring, 1-3 parts of sealing outer tube, 1-4 parts of pressure relief groove and outer drill bit;
2. Inner assembly
I, fixed part
2-1 Parts of a spearhead fishing assembly, 2-2 parts of a suspension ring, 2-3 parts of a connecting shaft, 2-4 parts of an upper mandrel, 2-5 parts of a lower mandrel, 2-6 parts of a liner tube piston,
II, piston type moving parts
2-7 Parts of shear pin sleeves, 2-7-1 parts of pin shaft holes, 2-8 parts of baffle rings, 2-9 parts of torsion springs, 2-10 parts of anti-withdrawal keys, 2-11 parts of semi-slip rings, 2-12 parts of slip ring sleeves, 2-13 parts of flange pistons, 2-14 parts of piston seats, 2-15 parts of quick-dismantling inner sleeves, 2-16 parts of quick-dismantling outer sleeves, 2-16-1 parts of small pressure relief holes, 2-17 parts of hydraulic connectors, 2-17-1 parts of large pressure relief holes, 2-18 parts of inner pipes, 2-19 parts of transparent PC bushings, 2-20 parts of inner drills, 2-21 parts of sealing elements;
III, pin shaft
3. An annular structure; 4. A water tap; 5. A top drive; 6. A wire rope; 7. A drill table top; 8. a subsea base plate holder; 9. Drilling holes; 10. Rope coring winch.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific examples.
Referring to fig. 1, the press-in rope coring drilling tool of the present invention includes an outer assembly 1 and an inner assembly 2, wherein the inner assembly 2 is disposed in the outer assembly 1 during a coring operation, and an annular structure 3 is formed between the inner assembly 2 and the outer assembly 1.
Referring to fig. 2 and 3, the press-in rope core drilling tool of the invention is provided with a seat ring 1-1 and a sealing outer tube 1-2 in an outer assembly 1 thereof, a pressure relief groove 1-3 is arranged at the lower part of the sealing outer tube 1-2, and an outer drill bit is arranged at the bottom of the outer assembly 1.
Referring to fig. 4, the press-in rope coring drilling tool of the present invention has an inner assembly 2 provided with a fixing part i and a piston type moving part ii sleeved outside the fixing part i, wherein the piston type moving part ii is fixed on the fixing part i through a pin shaft iii before the coring operation.
Referring to fig. 5, the fixing component i of the press-in rope core drilling tool of the invention comprises a spearhead component 2-1, a suspension ring 2-2, a connecting shaft 2-3 and a mandrel, wherein the spearhead component 2-1 is connected with the mandrel through the connecting shaft 2-3, the suspension ring 2-2 is sleeved on the connecting shaft 2-3, and the inner assembly 2 is carried on the seat ring 1-1 of the outer assembly 1 through the suspension ring 2-2; the mandrel comprises an upper mandrel 2-4 and a lower mandrel 2-5, a clamping groove is formed in the connecting position of the upper mandrel 2-4 and the lower mandrel 2-5, and a liner tube piston 2-6 is arranged at the lower end of the lower mandrel 2-5.
Referring to fig. 6, the piston type rope core drill of the invention comprises a piston assembly, a quick dismounting mechanism, an inner pipe assembly and inner drills 2-20; the piston assembly comprises a flange piston 2-13, a piston seat 2-14, a slip ring sleeve 2-12, a semi-slip ring 2-11, a shear pin sleeve 2-7 and an anti-back mechanism, wherein the shear pin sleeve 2-7, the semi-slip ring 2-11, the slip ring sleeve 2-12 and the piston seat 2-14 are sequentially connected from top to bottom, a sealing piece 2-21 is arranged on the inner wall of the slip ring sleeve 2-12 and the inner wall of the piston seat 2-14, a pin shaft hole 2-7-1 is arranged on the shear pin sleeve 2-7, a pin shaft III is arranged in the pin shaft hole 2-7-1 and penetrates through a connecting shaft 2-3, the flange piston 2-13 is embedded between the piston seat 2-14 and the slip ring sleeve 2-12, the anti-back mechanism comprises an anti-back key 2-10 and a torsion spring 2-9, the anti-back key 2-10 is arranged in a bilateral symmetry manner, is assembled with the shear pin sleeve 2-7 in a hinging manner, and a torsion spring 2-9 is arranged between the shear pin sleeve 2-7 and the anti-back key 2-10 hinging shaft; the quick-dismantling mechanism comprises a quick-dismantling inner sleeve 2-15 and a quick-dismantling outer sleeve 2-16 which are matched with each other, wherein the upper end of the quick-dismantling inner sleeve 2-15 is assembled with a piston seat 2-14 of a piston assembly, the lower end of the quick-dismantling outer sleeve 2-16 is assembled with an inner pipe assembly, and a small pressure relief hole 2-16-1 is arranged on the side wall of the quick-dismantling outer sleeve 2-16; the inner pipe assembly comprises a pressure relief joint 2-17, an inner pipe 2-18 and a transparent PC lining pipe 2-19, wherein the upper end of the inner pipe 2-18 is connected with a quick release outer sleeve 2-16 through the pressure relief joint 2-17, the lower end of the inner pipe is connected with an inner drill bit 2-20, a large pressure relief hole 2-17-1 is formed in the side wall of the pressure relief joint 2-17, and the transparent PC lining pipe 2-19 is embedded in the inner cavities of the inner pipe 2-18 and the inner drill bit 2-20.
Referring to fig. 7, 8 and 9, during coring operation, high-pressure slurry is injected into an annular structure 3 formed between an inner assembly 2 and an outer assembly 1 by a water pump, and a piston type moving part II is pushed by slurry pressure to shear a pin shaft III and then move downwards, so that an inner drill bit 2-20 is flushed into a weak stratum and a core is acquired in an inner pipe assembly; after the coring operation is completed, the piston assembly is limited by the cooperation of the anti-withdrawal key 2-10 and the clamping grooves at the connecting parts of the upper mandrel 2-4 and the lower mandrel 2-5.
Referring to fig. 6, the push-in rope core drilling tool of the invention is provided with the baffle ring 2-8 outside the pin shearing sleeve 2-7, so that the blocking accident caused by accidental play or falling of the pin shaft III in the process of lowering or lifting the drilling tool can be prevented; the pressed-in rope core drilling tool disclosed by the invention has the advantages that the semi-slip ring 2-11 is designed into two semicircular ring structures clamped on the shear pin sleeve 2-11, and a 5mm fit clearance is reserved between the semi-slip ring 2-11 and the shear pin sleeve 2-11 along the axial direction, so that when a pin III is assembled again, pin holes on the shear pin sleeve and a connecting shaft can be aligned.
Referring to fig. 10, the press-in type rope coring technique of the invention adopts the press-in type rope coring drilling tool to realize the drilling and coring operation of weak stratum, and the operation steps are as follows:
a. After the last coring operation is finished, sweeping holes, lifting a drilling tool away from the bottom of the holes by a certain distance, fixing a drill stem on a drill floor surface 7 through a hole clamp holder, and lifting the assembled inner assembly 2 by the cooperation of a top drive 5 and a fisher and placing the inner assembly into the drill stem from a hole;
b. The inner assembly 2 is lowered into the outer assembly 1 by the rope coring winch 10, so that the suspension ring 2-2 of the inner assembly 2 is pressed on the seat ring 1-1 of the outer assembly 1, and the steel wire rope 6 of the rope coring winch 10 is slightly released, so that the rope coring winch 10 is not in a tightening state;
c. Closing the center Kong Jiaosai of the top drive water tap 4, enabling the rubber plug to squeeze the steel wire rope 6, opening a lifting compensation system of the top drive 5, under the cooperation of the rope coring winch 10, lowering a drilling tool by the top drive 5, continuing to lower the ocean heave height after the outer drill bit 1-4 of the outer assembly 1 contacts the bottom of the hole 9 of the drill hole, and then operating the ocean base plate, and clamping and fixing a drill string through the ocean base plate clamp 8;
d. Starting a pump to feed water, wherein a flange piston 2-13 in an inner assembly 2 generates downward thrust under the action of mud pressure, after a pin shaft III is sheared by a pin shearing sleeve 2-7, an inner pipe 2-18 is driven to punch out downwards, an inner drill bit 2-20 enters a weak stratum to start coring, sea water between a mandrel and the inner pipe is discharged through a large pressure relief hole 2-17-1 of a pressure relief joint 2-17, when a piston type operating part II is pushed by mud to move to the position near the end of a stroke, a liner piston 2-6 covers the large pressure relief hole 2-17-1, at the moment, the large pressure relief hole 2-17-1 fails, a small pressure relief hole 2-16 on a quick-release outer sleeve 2-16 continuously feeds water to relieve pressure so as to control the pressure difference between the upper and lower parts of the flange piston 2-13, the impact between the liner piston 2-6 and the quick-release inner sleeve 2-15 caused by the excessive speed of the piston type operating part II is avoided, when the flange piston type operating part 2-13 moves to the position of a pressure relief groove 1-3 of a sealed outer pipe 1-2, the mud pressure is reduced, and the secondary coring process is ended;
e. Opening a sea base disc clamp holder 8, lifting a top drive 5 and a drilling tool, driving a seat ring 1-1 in an outer assembly 1, flushing an inner pipe 2-18 of a stratum to leave the hole bottom, opening the center Kong Jiaosai of a water faucet 4, and lifting the inner assembly 2 through a rope coring winch 10;
f. the drill column is fixed on the drill floor 7 by the orifice clamp holder, the top drive 5 is disconnected with the drill column, the inner assembly 2 lifted to the orifice is placed on a backing plate of the orifice, then the inner assembly is divided into an upper part and a lower part by the inner assembly quick disassembly mechanism, the upper part and the lower part are respectively taken out by the fisher, and the transparent PC liner tubes 2-19 in the inner tube are extracted to finish a coring operation;
g. the inner assembly 2 is reassembled for standby, the top drive 5 is connected with the drill string to sweep the hole, the part of the drill hole 9 where the core is obtained is swept, and then the steps are repeated to enter the next working cycle.
Claims (2)
1. A press-in rope core drilling tool comprises an outer assembly (1) and an inner assembly (2), wherein the inner assembly (2) is arranged in the outer assembly (1) during core drilling operation, and an annular structure (3) is formed between the inner assembly (2) and the outer assembly (1); the sealing device is characterized in that a seat ring (1-1) and a sealing outer tube (1-2) are arranged in the outer assembly (1), and a pressure relief groove (1-3) is arranged at the lower part of the sealing outer tube (1-2); the inner assembly is provided with a fixed part (I) and a piston type moving part (II) sleeved outside the fixed part (I), the fixed part (I) comprises a spearhead component (2-1), a suspension ring (2-2), a connecting shaft (2-3) and a mandrel, the spearhead component (2-1) is connected with the mandrel through the connecting shaft (2-3), the suspension ring (2-2) is sleeved on the connecting shaft (2-3), the inner assembly (2) is carried on a seat ring (1-1) of the outer assembly (1) through the suspension ring (2-2), the piston type moving part (II) is fixed on the connecting shaft (2-3) through a pin shaft (III) before coring operation, a flange piston (2-13) tightly attached to the sealing outer tube (1-2) in the outer assembly (1) is arranged in the piston type moving part (II), an inner drill bit (2-20) is arranged at the lower end of the piston type moving part (II), during the coring operation, a high-pressure water pump arranged on the drill bit (7) pushes slurry to be injected into the inner drill bit assembly (2) to push the inner drill bit assembly (2) to move downwards to the annular space (3) through the pin shaft (III) to move downwards to form the piston type moving part (II), flushing the inner drill bit (2-20) into the weak stratum and obtaining a core in the inner tube assembly;
The piston type moving part (II) comprises a piston assembly, an inner pipe assembly and an inner drill bit (2-20); the piston assembly comprises a flange piston (2-13), a piston seat (2-14), a slip ring sleeve (2-12), a semi-slip ring (2-11) and a shear pin sleeve (2-7), wherein the shear pin sleeve (2-7), the semi-slip ring (2-11), the slip ring sleeve (2-12) and the piston seat (2-14) are sequentially connected from top to bottom, sealing pieces (2-21) are arranged on the inner walls of the slip ring sleeve (2-12) and the piston seat (2-14), a pin shaft hole (2-7-1) is formed in the shear pin sleeve (2-7), a pin shaft (III) is arranged in the pin shaft hole (2-7-1) and penetrates through a connecting shaft (2-3), and the flange piston (2-13) is embedded between the piston seat (2-14) and the slip ring sleeve (2-12); mounting an inner tube assembly and an inner drill bit (2-20) below the piston assembly;
The core shaft comprises an upper core shaft (2-4) and a lower core shaft (2-5), a clamping groove is formed in the connecting part of the upper core shaft (2-4) and the lower core shaft (2-5), and a liner tube piston (2-6) is arranged at the lower end of the lower core shaft (2-5);
The piston assembly is further provided with an anti-withdrawal mechanism, the anti-withdrawal mechanism comprises an anti-withdrawal key (2-10) and a torsion spring (2-9), the anti-withdrawal key (2-10) is symmetrically arranged in two groups left and right, is assembled with the shear pin sleeve (2-7) in a hinged mode, the torsion spring (2-9) is arranged between the shear pin sleeve (2-7) and a hinged shaft of the anti-withdrawal key (2-10), and after the coring operation is completed, the piston assembly is limited by matching clamping grooves at the connecting parts of the anti-withdrawal key (2-10) with the upper mandrel (2-4) and the lower mandrel (2-5);
the inner pipe assembly comprises a pressure relief joint (2-17), an inner pipe (2-18) and a transparent PC lining (2-19); the upper end of the inner pipe (2-18) is connected with the quick-release jacket (2-16) through the pressure relief joint (2-17), the lower end of the inner pipe is connected with the inner drill bit (2-20), and the transparent PC bushing (2-19) is embedded in the inner cavities of the inner pipe (2-18) and the inner drill bit (2-20);
A large pressure relief hole (2-17-1) is formed in the side wall of the pressure relief joint (2-17), a small pressure relief hole (2-16-1) is formed in the side wall of the quick release sleeve (2-16), and the control of the movement speed of the piston type moving part (II) when approaching to the end point is realized through the cooperation of the large pressure relief hole (2-17-1) and the small pressure relief hole (2-16-1) with a liner tube piston (2-6) arranged at the lower end of the lower mandrel (2-5);
The piston type moving part (II) is further provided with a quick-dismantling mechanism, the quick-dismantling mechanism comprises a quick-dismantling inner sleeve (2-15) and a quick-dismantling outer sleeve (2-16) which are matched with each other, wherein the upper end of the quick-dismantling inner sleeve (2-15) is assembled with a piston seat (2-14) of a piston assembly, and the lower end of the quick-dismantling outer sleeve (2-16) is assembled with an inner pipe assembly.
2. A pressed-in rope coring technique, which adopts the drilling tool as claimed in claim 1, and is characterized in that the operation steps for realizing the drilling and coring operation of the weak stratum are as follows:
a. After the last coring operation is finished, sweeping holes, lifting a drilling tool away from the bottom of the holes by a certain distance, fixing a drill stem on a drilling floor surface (7) through an orifice clamp holder, and lifting the assembled inner assembly (2) by the cooperation of a top drive (5) and a fisher and placing the inner assembly into the drill stem from an orifice;
b. The inner assembly (2) is lowered into the outer assembly (1) by the rope coring winch (10), so that the suspension ring (2-2) of the inner assembly (2) is pressed on the seat ring (1-1) of the outer assembly (1), and the steel wire rope (6) of the rope coring winch (10) is slightly released, so that the rope coring winch is not in a tightening state;
c. Closing the center Kong Jiaosai of the top drive water tap (4), enabling the rubber plug to squeeze the steel wire rope (6), opening a lifting compensation system of the top drive (5), and under the cooperation of a rope coring winch (10), lowering a drilling tool by the top drive (5), and clamping and fixing a drill string through a sea base disc clamp holder (8);
After the drilling tool is lowered to the outer drill bit (1-4) of the outer assembly (1) to contact the bottom of the hole of the drill hole (9), continuously lowering the ocean heave height, then operating the ocean base plate, and clamping and fixing the drill string through the ocean base plate clamp holder (8);
d. The pump is started to feed water, a flange piston (2-13) in the inner assembly (2) generates downward thrust under the action of mud pressure, the pin shaft (III) is sheared by the pin shearing sleeve (2-7) to drive the inner pipe (2-18) to punch out downwards, an inner drill bit (2-20) enters a weak stratum to obtain a core sample, and when the flange piston (2-13) moves to the position of a pressure relief groove (1-3) of the sealed outer pipe (1-2), the mud pressure is reduced, and the secondary coring process is finished;
When the inner pipe assembly starts to core, seawater entering between the mandrel and the inner pipe is discharged through a large pressure relief hole (2-17-1) of a pressure relief joint (2-17), when a piston type running part (II) moves to the position near to the end of a stroke under the pushing of slurry, a liner piston (2-6) covers the large pressure relief hole (2-17-1), at the moment, the large pressure relief hole (2-17-1) fails, a small pressure relief hole (2-16-1) on a quick-release outer sleeve (2-16) continuously discharges water and relieves pressure, so that the pressure difference between the upper part and the lower part of a flange piston (2-13) is controlled, and the impact between the liner piston (2-6) and a quick-release inner sleeve (2-15) caused by the too high speed of the piston type running part (II) is avoided;
e. Opening a sea base disc clamp holder (8), lifting a top drive (5) and a drilling tool, driving a seat ring (1-1) in an outer assembly (1), flushing an inner pipe (2-18) of a stratum to leave the hole bottom, opening the center Kong Jiaosai of a water tap (4), and lifting an inner assembly (2) through a rope coring winch (10);
f. The drill stem is fixed on a drill floor (7) by an orifice clamp, the top drive (5) is disconnected with the drill stem, an inner assembly (2) lifted to the orifice is placed on a backing plate of the orifice, the inner assembly is divided into an upper part and a lower part by an inner assembly quick disassembly mechanism, the upper part and the lower part are respectively taken out by a fisher, and a transparent PC lining (2-19) in the inner pipe is pulled out to finish a coring operation;
g. The inner assembly (2) is reassembled for standby, the top drive (5) is connected with the drill string to sweep the hole, the part of the drill hole (9) where the core is obtained is swept, and then the steps are repeated to enter the next working cycle.
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| CN113309479B (en) * | 2021-07-12 | 2022-06-24 | 中国地质科学院勘探技术研究所 | Efficient coring drilling device and method for shallow sea reef limestone |
| CN115341867B (en) * | 2022-07-25 | 2024-03-19 | 广州海洋地质调查局 | Marine sediment penetrating rope coring device of shipborne drilling machine |
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