CN113738298B - Pressure-maintaining coring device - Google Patents
Pressure-maintaining coring device Download PDFInfo
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- CN113738298B CN113738298B CN202111062583.7A CN202111062583A CN113738298B CN 113738298 B CN113738298 B CN 113738298B CN 202111062583 A CN202111062583 A CN 202111062583A CN 113738298 B CN113738298 B CN 113738298B
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- 238000005520 cutting process Methods 0.000 claims abstract description 30
- 239000011435 rock Substances 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 42
- 239000010959 steel Substances 0.000 claims description 42
- 238000005096 rolling process Methods 0.000 claims description 33
- 230000000694 effects Effects 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 9
- 230000008961 swelling Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 abstract description 8
- 238000011160 research Methods 0.000 abstract description 6
- 239000000872 buffer Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 3
- 230000007306 turnover Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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- 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
- E21B25/10—Formed core retaining or severing means
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- 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
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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)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a pressure-maintaining coring device which comprises an outer pipe assembly, an inner pipe assembly, an anti-torsion assembly, a sealing stop door and a controller. The outer pipe assembly comprises an outer cylinder and a drill bit; the outer barrel is arranged along the vertical direction and is provided with a first accommodating cavity and a first opening. The inner tube assembly comprises an inner tube, a cutting component and a lifting component; the inner cylinder is provided with a second accommodating cavity and a second opening. The anti-torsion component counteracts the torsion force transmitted to the inner cylinder by the rotation of the outer cylinder and buffers the vibration transmitted to the inner cylinder by the outer cylinder. The sealing stop door is used for being opened in the process that the rock core enters the second accommodating cavity; the cutting assembly cuts the rock core, and the inner cylinder and the cut rock core are automatically closed after being lifted upwards by the lifting assembly so as to seal the second accommodating cavity. The pressure-maintaining coring device provided by the invention can improve the accuracy and stability of core sampling, can maintain the pressure of a core sample, can facilitate subsequent research work, and has strong practicability.
Description
Technical Field
The invention belongs to the technical field of underground sampling, and particularly relates to a pressure-maintaining coring device.
Background
The shale gas is natural gas which is rich in organic matters, has certain commercial values of biological cause, pyrolysis cause and mixed cause due to organic matter adsorption effect or cracks and matrix pores in rocks in mature dark shale or high-carbon shale, and has a very wide development prospect. In the shale gas exploitation process, geological data such as the original oil saturation of an oil layer in the early stage, the formation porosity and the like have important influence significance on the later-stage synergistic yield increase and development scheme improvement. The shale gas extraction process requires coring. Because part shale brittleness index is big, and drive at the drilling equipment and get core urceolus and drill bit synchronous revolution, the rock specimen is very easily got the core in-process and is rocked because of getting the core inner tube and take place torsional fracture, can't guarantee to obtain complete rock core, get the gap in the middle of core inner tube and the urceolus and can lead to getting the core inner tube and rotate thereupon when getting the core urceolus and creep into the in-process to when external disturbance is great, get the core composition and probably have great difference with the true situation.
Among the prior art, the coring equipment that uses often sets up anti-torsion structure between coring urceolus and coring inner tube and reduces the rotation of coring inner tube, though has anti-torsion effect, still has certain rotation space between coring urceolus and the coring inner tube, easily takes place the skew, and when external disturbance is great, the rock specimen that obtains still has the error with real stratum condition. And the coring equipment with anti-torsion structure can only reduce the relative motion between coring inner tube and coring outer tube, neglected the collision or friction phenomenon that results in because the size of the core and the size of the coring tube can not realize complete matching after coring, the practicality is relatively poor. In addition, conventional coring equipment does not have the pressurize measure or the pressurize time is limited, because the sample position is deep relatively and the environment is complicated, remote control is difficult, because conditions such as temperature, pressure change when coring equipment retrieves the well head from the pit in the pit, the nature of its inside rock core sample must change, leads to unable reflection true underground environment, brings the error for research such as follow-up experiments, and the practicality is relatively poor.
Disclosure of Invention
The embodiment of the invention provides a pressure-maintaining coring device, and aims to solve the problem that the existing coring equipment is poor in practicability due to the fact that torsion cannot be resisted and the pressure-maintaining effect is limited.
In order to achieve the purpose, the invention adopts the technical scheme that: provided is a pressure-maintaining coring device, including:
the outer pipe assembly comprises an outer cylinder and a drill bit; the outer barrel is arranged along the vertical direction and is provided with a first accommodating cavity, and a first opening communicated with the first accommodating cavity is formed in the bottom end of the outer barrel; the drill bit is arranged at the bottom end of the outer barrel and is provided with a core walking channel communicated with the first opening;
the inner tube assembly comprises an inner tube, a cutting assembly and a lifting assembly; the inner cylinder is arranged in the first accommodating cavity along the vertical direction, the outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder, the inner cylinder is provided with a second accommodating cavity, and a second opening communicated with the second accommodating cavity is formed in the bottom end of the inner cylinder; the cutting assembly is arranged in the second accommodating cavity and is used for cutting the core which passes through the core walking channel and the first opening and enters the second accommodating cavity; the lifting assembly is arranged in the first accommodating cavity, is respectively connected with the top end of the inner cylinder and the inner wall of the outer cylinder, and is used for driving the inner cylinder along the vertical direction;
the anti-torsion component is arranged in the first accommodating cavity, is positioned between the inner side wall of the outer cylinder and the outer side wall of the inner cylinder, and is used for offsetting the torsion force transmitted to the inner cylinder by the rotation of the outer cylinder and buffering the vibration effect transmitted to the inner cylinder by the outer cylinder;
the sealing stop door is arranged at the second opening and is used for being opened in the process that the core enters the second accommodating cavity; cutting the rock core by the cutting assembly, lifting the inner cylinder and the cut rock core upwards by the lifting assembly, and then automatically closing to seal the second accommodating cavity; and
a matched controller.
In a possible implementation manner, the anti-torsion components are provided with at least two groups, and the anti-torsion components of each group are arranged at intervals along the vertical direction; each set of said anti-twist assemblies comprising:
the axis of the first rolling bearing is arranged along the vertical direction, and the first rolling bearing is fixedly arranged in the first accommodating cavity and is provided with a first inner ring and a first outer ring;
a second rolling bearing, the axis of which is arranged in line with the axis of the first rolling bearing, the second rolling bearing being located in the first inner ring; the second rolling bearing is provided with a second inner ring and a second outer ring, the diameter of the second outer ring is smaller than that of the first inner ring, and the second inner ring is in clearance fit with the inner cylinder; and
a plurality of springs which are annular and are arranged between the second outer ring and the first inner ring at intervals; each spring is arranged along the radial direction of the first rolling bearing or the second rolling bearing, one end of each spring is fixedly connected with the side wall of the first inner ring, and the other end of each spring is fixedly connected with the side wall of the second outer ring.
In a possible implementation manner, two semicircular baffles are provided, and each semicircular baffle is hinged with the inner cylinder so as to rotate in a pitching manner in the second accommodating cavity; the two semicircular baffles are mutually involuted when rotated to a horizontal state, and are combined together to form a circular plate body matched with the second opening, and the diameter of each semicircular baffle is smaller than the inner diameter of the inner cylinder;
the water swelling and stopping glue covers the outer surfaces of the two semicircular baffles and is used for swelling after contacting with drilling fluid so as to fill a gap between the two semicircular baffles which are closed; and
the two torsional springs are respectively arranged in one-to-one correspondence with the two semicircular baffles, each torsional spring is sleeved on a hinge shaft of the corresponding semicircular baffle, one end of each torsional spring is abutted against the semicircular baffle, and the other end of each torsional spring is abutted against the inner cylinder and is used for driving the semicircular baffles to turn downwards;
and the bottom end surrounding the inner barrel is provided with a limiting folding edge, and the limiting folding edge is provided with a hinge seat for the semicircular baffle plate to hinge.
In some embodiments/examples/illustrations, the limiting flange extends horizontally inwards along the radial direction of the inner cylinder, the inner diameter of the limiting flange is smaller than the diameter of the semicircular baffle, and the limiting flange is used for limiting the semicircular baffle which is turned downwards so that the semicircular baffle is placed horizontally.
In one possible implementation, the cutting assembly includes:
at least two cutters are arranged, each cutter is annularly arranged in the second accommodating cavity at intervals, and each cutter is horizontally arranged and hinged with the inner wall of the second accommodating cavity; the hinge axis of the cutter and the inner wall of the second accommodating cavity is arranged along the vertical direction; and
at least two first telescopic structures are arranged, and each first telescopic structure is in one-to-one correspondence with each cutter and is electrically connected with the controller; every first extending structure has first stiff end and first flexible end, first stiff end with the internal face in second holding chamber is articulated mutually, first flexible end with the cutter is articulated mutually for drive the cutter horizontal rotation, the tool bit of cutter to the center in second holding chamber removes, in order to be located cut the core in the second holding chamber.
In some embodiments/exemplarily/examples, each of the cutters is of a triangular configuration.
In one possible implementation, the pulling assembly includes:
the driving motor is fixedly arranged at the top end of the inner barrel, the power output end is horizontally arranged, and the driving motor is electrically connected with the controller;
the winding drum is coaxially connected with the power output end of the driving motor; and
and one end of the pull rope is fixedly connected with the side wall of the top of the second accommodating cavity, and the other end of the pull rope is wound on the winding drum.
In one possible implementation, the inner tube assembly further includes a clamping assembly, the clamping assembly including:
the annular sliding rail is arranged in the second accommodating cavity and is positioned above the cutting assembly, and the annular sliding rail is fixedly arranged on the inner wall of the second accommodating cavity and is arranged in a collinear way with the axis of the inner cylinder;
at least two elastic steel sheets are arranged, and each elastic steel sheet is annular and is arranged in the second accommodating cavity at intervals; each elastic steel sheet is provided with an elastic steel sheet first end and an elastic steel sheet second end, the elastic steel sheet first end is hinged with the inner wall of the second accommodating cavity, the hinge axis is arranged along the vertical direction, and the elastic steel sheet second end is arranged on the annular slide rail in a sliding mode; and
at least two second telescopic structures are arranged, and each second telescopic structure is in one-to-one correspondence with each elastic steel sheet; every the second extending structure all has the flexible end of second stiff end and second, the second stiff end with the inner wall in second holding chamber is articulated mutually, the flexible end of second with correspond the elastic steel sheet second end is articulated mutually, is used for the drive the elastic steel sheet second end is close to the first end of elastic steel sheet removes, so that the middle part of elastic steel sheet along the radial inward deformation of inner tube is protruding, and with the core lateral wall butt in the second holding chamber.
In some embodiments/examples/illustrations, a pressure sensor is disposed at a top of the second receiving cavity, and the pressure sensor is electrically connected to the controller for monitoring the core entering the second receiving cavity.
In this implementation/application embodiment, the outer cylinder is provided and can be connected with the drilling equipment and the drill bit respectively, and the first accommodating cavity is provided inside the outer cylinder, so that the inner cylinder can be conveniently placed, the drill bit has a core walking channel, the core can sequentially pass through the first opening and the second opening and enter the second accommodating cavity, and the core sampling operation is ensured to a certain extent. In addition, set up anti torsional component between inner tube and urceolus, can offset the torsional force that the urceolus transmitted the inner tube, and then guarantee that the urceolus rotates the in-process, the inner tube keeps quiescent condition, and this kind of structure can prevent at the in-process of core sample, and the core takes place the breakage because of torsion is too big, and then can guarantee the integrality of core. The anti torsional component can also buffer the vibration effect that the urceolus transmitted the inner tube to make the inner tube keep accurate and stable placing in the second holding chamber, can be convenient for the accurate and smooth entering into to the second holding chamber of core, the core sampling effect is better. This scheme has still set up sealed shutter in the uncovered department of second, can seal the second holding chamber, and then seal the pressurize to the core sample that gets into the second holding intracavity, can reflect real low environment, can be convenient for subsequent research work. This scheme is through the anti subassembly that twists reverse and sealed shutter that sets up, can improve the accuracy and the stability of core sample to can carry out the pressurize to the core sample, subsequent research work of can being convenient for, the practicality is strong.
Drawings
FIG. 1 is a schematic cross-sectional view of a pressure-maintaining coring device provided in an embodiment of the present invention;
FIG. 2 is a schematic sectional view of the A-A direction of the pressure-holding coring device provided in the embodiment of FIG. 1;
FIG. 3 is a schematic sectional view of the B-B direction of the pressure-holding coring device provided in the embodiment of FIG. 1;
FIG. 4 is an enlarged schematic view of the pressure-holding coring device provided in the embodiment of FIG. 1 at the position C;
description of reference numerals:
10. an outer tube assembly; 11. an outer cylinder; 111. a first accommodating cavity; 112. a first opening; 12. a drill bit; 20. an inner tube assembly; 21. an inner barrel; 211. a second accommodating cavity; 212. a second opening; 213. limiting and folding edges; 22. a cutting assembly; 221. a cutter; 222. a first telescoping structure; 23. a pull-up assembly; 231. a drive motor; 232. a reel; 233. pulling a rope; 24. a clamping assembly; 241. an annular slide rail; 242. an elastic steel sheet; 243. a second telescoping structure; 30. a torsion resistant assembly; 31. a first rolling bearing; 32. a second rolling bearing; 33. a spring; 40. sealing the stop door; 41. a semicircular baffle plate; 42. water-swellable water-stop glue; 50. and (5) a core.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4 together, the pressure-holding coring device provided by the present invention will now be described. The pressure-maintaining coring device comprises an outer pipe assembly 10, an inner pipe assembly 20, an anti-torsion assembly 30, a sealing stop door 40 and a controller. Wherein, the outer tube assembly 10 comprises an outer tube 11 and a drill bit 12; the outer cylinder 11 is arranged along the vertical direction and is provided with a first accommodating cavity 111, and the bottom end of the outer cylinder 11 is provided with a first opening 112 communicated with the first accommodating cavity 111; the drill bit 12 is disposed at the bottom end of the outer cylinder 11 and has a core passage communicating with the first opening 112. The inner tube assembly 20 comprises an inner tube 21, a cutting assembly 22 and a lifting assembly 23; the inner cylinder 21 is arranged in the first accommodating cavity 111 along the vertical direction, the outer diameter of the inner cylinder 21 is smaller than the inner diameter of the outer cylinder 11, the inner cylinder 21 is provided with a second accommodating cavity 211, and the bottom end of the inner cylinder 21 is provided with a second opening 212 communicated with the second accommodating cavity 211; the cutting assembly 22 is disposed in the second accommodating cavity 211 and is used for cutting the rock core 50 which passes through the core passing channel and the first opening 112 and enters the second accommodating cavity 211; the pulling assembly 23 is disposed in the first accommodating chamber 111, and is connected to a top end of the inner cylinder 21 and an inner wall of the outer cylinder 11, respectively, for pulling the inner cylinder 21 in a vertical direction.
The anti-torsion assembly 30 is disposed in the first receiving chamber 111 and between the inner sidewall of the outer cylinder 11 and the outer sidewall of the inner cylinder 21, and is used for offsetting the torsion force transmitted to the inner cylinder 21 by the rotation of the outer cylinder 11 and buffering the vibration effect transmitted to the inner cylinder 21 by the outer cylinder 11. The sealing shutter 40 is arranged at the second opening 212 and is used for opening when the core 50 enters the second accommodating cavity 211; the core 50 is cut by the cutting assembly 22 and automatically closed after the inner cylinder 21 and the cut core 50 are lifted upwards by the lifting assembly 23, so as to seal the second accommodating cavity 211.
It should be noted that, the outer cylinder 11 and the inner cylinder 21 are both cylindrical structures, the first accommodating cavity 111 and the second accommodating cavity 211 are also cylindrical cavities, and the connection modes of the drill 12, the drill 12 and the outer cylinder 11 are all the prior art, and are not described herein again.
Compared with the prior art, the pressure maintaining coring device provided by the embodiment has the advantages that the outer barrel 11 is arranged, the outer barrel can be respectively connected with drilling equipment and the drill bit 12, the first accommodating cavity 111 is arranged inside the outer barrel 11, the inner barrel 21 can be conveniently placed, the drill bit 12 is provided with a core walking channel, the rock core 50 can be enabled to sequentially pass through the first opening 112 and the second opening 212 and enter the second accommodating cavity 211, and the sampling work of the rock core 50 is guaranteed to a certain extent. In addition, the anti-torsion component 30 is arranged between the inner cylinder 21 and the outer cylinder 11, so that the torsion force transmitted to the inner cylinder 21 by the outer cylinder 11 can be offset, and further, the inner cylinder 21 is kept in a static state in the rotation process of the outer cylinder 11, the structure can prevent the rock core 50 from being broken due to overlarge torsion in the sampling process of the rock core 50, and further, the integrity of the rock core 50 can be ensured. The anti-torsion component 30 can also buffer the vibration effect transmitted to the inner cylinder 21 by the outer cylinder 11, so that the inner cylinder 21 can be accurately and stably placed in the second accommodating cavity 211, the rock core 50 can accurately and smoothly enter the second accommodating cavity 211 conveniently, and the sampling effect of the rock core 50 is better. This scheme has still set up sealed shutter 40 in the uncovered 212 department of second, can seal second holding chamber 211, and then seals the pressurize to the rock core 50 samples that get into in second holding chamber 211, can reflect real low environment, can be convenient for subsequent research work. This scheme is through the antitorque commentaries on classics subassembly 30 and the sealed shutter 40 that set up, can improve the accuracy and the stability of 50 samples of core to can carry out the pressurize to 50 samples of core, subsequent research work of can being convenient for, the practicality is strong.
In some embodiments, the anti-twist assembly 30 may be configured as shown in FIG. 1. Referring to fig. 1, the anti-twist assembly 30 is provided in at least two sets, each set being spaced apart in a vertical direction; each set of anti-torsion assemblies 30 comprises a first rolling bearing 31, a second rolling bearing 32 and a spring 33. The axis of the first rolling bearing 31 is arranged along the vertical direction, and the first rolling bearing 31 is fixedly installed in the first accommodating cavity 111 and has a first inner ring and a first outer ring. The axis of the second rolling bearing 32 is arranged in line with the axis of the first rolling bearing 31, the second rolling bearing 32 being located in the first inner ring; the second rolling bearing 32 has a second inner ring and a second outer ring, the diameter of the second outer ring is smaller than that of the first inner ring, and the second inner ring is in clearance fit with the inner cylinder 21. A plurality of springs 33 are arranged, and the plurality of springs 33 are annular and arranged between the second outer ring and the first inner ring at intervals; each spring 33 is provided along the radial direction of the first rolling bearing 31 or the second rolling bearing 32, and has one end fixedly connected to the side wall of the first inner ring and the other end fixedly connected to the side wall of the second outer ring. First outer lane is interference fit with the inner wall of first holding chamber 111, also can the beading on the lateral wall of first holding chamber 111, through first rolling bearing and second rolling bearing's setting, can effectually place the torsional force transmission of urceolus 11 to inner tube 21 on, and then guarantee the stability of inner tube 21. In addition, the outer cylinder 11 is connected with the drill bit 12, and has a vibration effect during rotation, and the spring 33 is arranged to effectively buffer the vibration effect, so as to prevent the inner cylinder 21 from vibrating.
Since the second rolling bearing 32 is connected only by the spring 33, the number of the springs 33 is large, and the strength thereof needs to be ensured sufficiently. The second inner ring is in clearance fit with the inner cylinder 21, mainly to ensure that the inner cylinder 21 can move in the first accommodating cavity 111.
In some embodiments, the sealing flap 40 may be configured as shown in FIG. 4. Referring to fig. 4, the sealing shutter 40 includes a semicircular baffle plate 41, a water-swellable water-stop adhesive 42, and a torsion spring. Two semicircular baffles 41 are arranged, and each semicircular baffle 41 is hinged with the inner cylinder 21 so as to rotate in a pitching manner in the second accommodating cavity 211; the two semicircular baffles 41 are mutually involuted when rotated to the horizontal state, and are combined together to form a circular plate body matched with the second opening 212, and the diameter of the semicircular baffles 41 is smaller than the inner diameter of the inner cylinder 21. The water-swelling glue 42 covers the outer surfaces of the two semicircular baffles 41 and is used for swelling after contacting with drilling fluid so as to fill the gap between the two semicircular baffles 41. The number of the torsion springs is two, the two torsion springs are respectively arranged in one-to-one correspondence with the two semicircular baffles 41, each torsion spring is sleeved on a hinge shaft of the corresponding semicircular baffle 41, one end of each torsion spring is abutted against the corresponding semicircular baffle 41, and the other end of each torsion spring is abutted against the inner cylinder 21 and is used for driving the semicircular baffles 41 to keep turning downwards. A limit folding edge 213 is arranged around the bottom end of the inner cylinder 21, and a hinge seat for the semicircular baffle plate 41 to hinge is arranged on the limit folding edge 213.
The two semicircular baffles 41 can ensure the core 50 to pass through after being overturned upwards by a certain angle, and can seal the second accommodating cavity 211 when being overturned downwards to be placed horizontally, so that the pressure maintaining effect can be ensured. Because the drilling process of drill bit 12, need continuously inject into drilling fluid, meet water swelling stagnant water glue 42 and meet the inflation behind the drilling fluid, can fill up the gap around semicircular baffle 41, and then guarantee sealed effect. The torsional spring can guarantee to overturn to the horizontal state and place when two semicircular baffles 41 do not receive external force, and the connection structure of torsional spring and torsional spring is prior art, and no longer repeated here.
The water-swellable water-stop adhesive 42 is a water-stop material having excellent workability, and is a water-swellable one-pack type sealant. Becomes a rubber elastic body having good recovery properties when hardened, expands in volume after being soaked in water, fills a gap, and exerts a reliable water stopping effect.
It should be noted that the diameter of the core 50 sample is smaller than the inner diameter of the second receiving cavity 211, and the angle of the semicircular baffle 41 turning upwards is not too large, so that the core 50 can pass through smoothly.
In some embodiments, the stop flange 213 may be configured as shown in FIG. 1. Referring to fig. 1, the limiting flange 213 extends horizontally inwards along the radial direction of the inner cylinder 21, the inner diameter of the limiting flange 213 is smaller than the diameter of the semicircular baffle plate 41, and the limiting flange 213 is used for limiting the downward-turning semicircular baffle plate 41, so that the semicircular baffle plate 41 is horizontally placed. Due to the arrangement of the folding edge structure, the semicircular baffle plate 41 can be prevented from being overturned downwards at an overlarge angle, and the semicircular baffle plate 41 can be horizontally placed. In addition, the turnover angle of the semicircular baffle plate 41 can be compensated, so that the upward turnover angle is increased, and the situation that the core 50 sample cannot pass through due to interference of the semicircular baffle plate 41 and the inner wall of the second accommodating cavity 211 in the upward turnover process can be prevented.
In some embodiments, the cutting assembly 22 may be configured as shown in FIG. 2. Referring to fig. 2, the cutting assembly 22 includes a cutting blade 221 and a first telescopic structure 222. At least two cutters 221 are arranged, each cutter 221 is annularly arranged in the second accommodating cavity 211 at intervals, and each cutter 221 is horizontally arranged and hinged with the inner wall of the second accommodating cavity 211; the hinge axis of the cutter 221 and the inner wall of the second accommodating cavity 211 is arranged along the vertical direction. At least two first telescopic structures 222 are provided, each first telescopic structure 222 is arranged corresponding to each cutter 221 one by one and is electrically connected with the controller; each first telescopic structure 222 has a first fixed end and a first telescopic end, the first fixed end is hinged to the inner wall surface of the second accommodating cavity 211, the first telescopic end is hinged to the cutter 221 for driving the cutter 221 to horizontally rotate, and the cutter head of the cutter 221 moves towards the center of the second accommodating cavity 211 to shear the rock core 50 located in the second accommodating cavity 211.
Because the texture of shale is more fragile soft, consequently need not too big cutting force, also need not the cutter 221 rotatory simultaneously, and cutter 221 and first extending structure 222 when initial condition, keep being close to between the lateral wall of the inward flange of hem and second holding chamber 211, can guarantee the smooth of core 50 sample and pass through, when needs cut core 50, the pulling of first extending structure 222 plays the rotation, and the one end of cutter 221 moves to the central direction of inner tube 21 to cut core 50. After the cutting is accomplished, first extending structure 222 and cutter 221 return to initial position, and the space that this kind of structure occupy is less, can guarantee the cutting work to the core 50 sample moreover, the sample work of being convenient for, simple structure, the practicality is strong.
In some embodiments, the cutter 221 may be configured as shown in fig. 2. Referring to fig. 2, each of the cutters 221 has a triangular shape and has three corners, a first corner is hinged to an inner wall of the second accommodating cavity 211, a second corner is hinged to the first telescopic structure 222, and a third corner is a cutter head and extends horizontally and outwardly between an inner edge of the folded edge and a side wall of the second accommodating cavity 211. After the cutter 221 is forced to rotate, the cutter head moves towards the center direction of the inner cylinder 21 to cut the rock core 50, the structure is simple, the manufacturing is convenient, and the practicability is strong.
In some embodiments, the pull assembly 23 described above may be configured as shown in FIG. 1. Referring to fig. 1, the pulling assembly 23 includes a driving motor 231, a reel 232, and a pulling rope 233. Wherein, the driving motor 231 is fixedly arranged at the top end of the inner cylinder 21, the power output end is horizontally arranged, and the driving motor 231 is electrically connected with the controller. The winding drum 232 is coaxially connected with the power output end of the driving motor 231. One end of the pull rope 233 is fixedly connected with the top side wall of the second accommodating cavity 211, and the other end is wound on the winding drum 232.
After the core 50 is cut, driving motor 231 drives reel 232 to rotate, and then under the effect of stay cord 233, inner tube 21 rebound, the core 50 sample that is cut this moment is rebound along with it, after inner tube 21 promoted to a take the altitude, semicircular baffle 41 breaks away from the butt effect with the core 50 parent, can overturn to the level downwards and place, and sealed shutter 40 seals second holding chamber 211 this moment. Therefore, the arrangement of the pulling assembly 23 can facilitate the separation of the cut core 50 sample from the core 50 parent body, and the pressure maintaining work of the core 50 sample is facilitated, so that the practicability is high.
In some embodiments, referring to fig. 3, the inner tube assembly 20 further comprises a clamping member 24, and the clamping member 24 comprises an annular slide rail 241, a resilient steel sheet 242, and a second telescopic structure 243. The annular slide rail 241 is disposed in the second accommodating cavity 211 and above the cutting assembly 22, and the annular slide rail 241 is fixedly disposed on an inner wall of the second accommodating cavity 211 and is collinear with an axis of the inner cylinder 21. At least two elastic steel sheets 242 are arranged, and each elastic steel sheet 242 is annularly arranged in the second accommodating cavity 211 at intervals; each elastic steel piece 242 has a first end of the elastic steel piece 242 and a second end of the elastic steel piece 242, the first end of the elastic steel piece 242 is hinged to the inner wall of the second accommodating cavity 211, the hinge axis is arranged along the vertical direction, and the second end of the elastic steel piece 242 is slidably arranged on the annular sliding rail 241. At least two second telescopic structures 243 are provided, and each second telescopic structure 243 is arranged corresponding to each elastic steel sheet 242 one by one; each second telescopic structure 243 has a second fixed end and a second telescopic end, the second fixed end is hinged to the inner wall of the second accommodating cavity 211, and the second telescopic end is hinged to the second end of the corresponding elastic steel sheet 242 and used for driving the second end of the elastic steel sheet 242 to move close to the first end of the elastic steel sheet 242, so that the middle part of the elastic steel sheet 242 protrudes along the radial inward deformation of the inner cylinder 21 and abuts against the side wall of the core 50 in the second accommodating cavity 211.
The arrangement of the clamping assembly 24 can ensure that the core 50 can be kept in a relatively static state with the inner barrel 21 in the process of cutting the core 50 and the process of pulling the inner barrel 21, and the structure can facilitate the sampling work of the core 50. Through the annular slide rail 241 who sets up, elastic steel piece 242 and second extending structure 243, its occupation space is less, can guarantee the smooth of core 50 sample and pass through to through elastic steel piece 242's deformation effect, can guarantee the stable centre gripping to core 50, simple structure, the practicality is strong.
To prevent the core 50 from being crushed, the length of the elastic steel plate may be increased in the vertical direction to increase the contact area with the core 50 sample. In addition, the inner surface of the elastic steel sheet 242 is provided with an anti-skid protrusion, so that the stability of clamping the rock core 50 is ensured.
In some embodiments, the inner barrel 21 can be configured as shown in FIG. 1. Referring to fig. 1, a pressure sensor is disposed at the top of the second receiving cavity 211, and the pressure sensor is electrically connected to the controller for monitoring the core 50 entering the second receiving cavity 211. After the top of core 50 contacts with pressure sensor, pressure sensor transmits the signal for the controller, and the controller control centre gripping subassembly 24 and cutting component 22 work in proper order, the collection work of the core 50 sample of being convenient for, the practicality is strong.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. Pressurize coring device, its characterized in that includes:
the outer pipe assembly comprises an outer cylinder and a drill bit; the outer barrel is arranged along the vertical direction and is provided with a first accommodating cavity, and a first opening communicated with the first accommodating cavity is formed in the bottom end of the outer barrel; the drill bit is arranged at the bottom end of the outer barrel and is provided with a core walking channel communicated with the first opening;
the inner tube assembly comprises an inner tube, a cutting assembly and a lifting assembly; the inner cylinder is arranged in the first accommodating cavity along the vertical direction, the outer diameter of the inner cylinder is smaller than the inner diameter of the outer cylinder, the inner cylinder is provided with a second accommodating cavity, and a second opening communicated with the second accommodating cavity is formed in the bottom end of the inner cylinder; the cutting assembly is arranged in the second accommodating cavity and is used for cutting the core which passes through the core walking channel and the first opening and enters the second accommodating cavity; the lifting assembly is arranged in the first accommodating cavity, is respectively connected with the top end of the inner cylinder and the inner wall of the outer cylinder, and is used for driving the inner cylinder along the vertical direction;
the anti-torsion components are arranged in the first accommodating cavity and positioned between the inner side wall of the outer barrel and the outer side wall of the inner barrel, at least two groups of anti-torsion components are arranged, and the anti-torsion components are arranged at intervals along the vertical direction; each group of anti-torsion assemblies comprises a first rolling bearing, a second rolling bearing and a spring; the axis of the first rolling bearing is arranged along the vertical direction, and the first rolling bearing is fixedly installed in the first accommodating cavity and is provided with a first inner ring and a first outer ring; the axis of the second rolling bearing is arranged in a collinear way with the axis of the first rolling bearing, and the second rolling bearing is positioned in the first inner ring; the second rolling bearing is provided with a second inner ring and a second outer ring, the diameter of the second outer ring is smaller than that of the first inner ring, and the second inner ring is in clearance fit with the inner cylinder; the springs are annular and are arranged between the second outer ring and the first inner ring at intervals; each spring is arranged along the radial direction of the first rolling bearing or the second rolling bearing, one end of each spring is fixedly connected with the side wall of the first inner ring, and the other end of each spring is fixedly connected with the side wall of the second outer ring; the anti-torsion component is used for offsetting the torsion force transmitted to the inner cylinder by the rotation of the outer cylinder and buffering the vibration effect transmitted to the inner cylinder by the outer cylinder;
the sealing stop door is arranged at the second opening and is used for being opened in the process that the core enters the second accommodating cavity; cutting the rock core by the cutting assembly, lifting the inner cylinder and the cut rock core upwards by the lifting assembly, and then automatically closing to seal the second accommodating cavity; and
a matched controller.
2. The dwell coring apparatus of claim 1, wherein the sealing shutter comprises:
the two semicircular baffles are hinged with the inner cylinder so as to rotate in the second accommodating cavity in a pitching manner; the two semicircular baffles are mutually involuted when rotated to a horizontal state, and are combined together to form a circular plate body matched with the second opening, and the diameter of each semicircular baffle is smaller than the inner diameter of the inner cylinder;
the water swelling and stopping glue covers the outer surfaces of the two semicircular baffles and is used for swelling after contacting with drilling fluid so as to fill a gap between the two semicircular baffles which are closed; and
the two torsional springs are respectively arranged in one-to-one correspondence with the two semicircular baffles, each torsional spring is sleeved on a hinge shaft of the corresponding semicircular baffle, one end of each torsional spring is abutted against the semicircular baffle, and the other end of each torsional spring is abutted against the inner cylinder and is used for driving the semicircular baffles to turn downwards;
and the bottom end surrounding the inner barrel is provided with a limiting folding edge, and the limiting folding edge is provided with a hinge seat for the semicircular baffle plate to hinge.
3. The pressure-maintaining coring device of claim 2, wherein the limiting flange extends horizontally inwards along the radial direction of the inner cylinder, the inner diameter of the limiting flange is smaller than the diameter of the semicircular baffle, and the limiting flange is used for limiting the semicircular baffle which turns downwards so that the semicircular baffle is horizontally placed.
4. The dwell coring apparatus of claim 1, wherein the cutting assembly comprises:
at least two cutters are arranged, each cutter is annularly arranged in the second accommodating cavity at intervals, and each cutter is horizontally arranged and hinged with the inner wall of the second accommodating cavity; the hinge axis of the cutter and the inner wall of the second accommodating cavity is arranged along the vertical direction; and
at least two first telescopic structures are arranged, and each first telescopic structure is in one-to-one correspondence with each cutter and is electrically connected with the controller; every first extending structure has first stiff end and first flexible end, first stiff end with the internal face in second holding chamber is articulated mutually, first flexible end with the cutter is articulated mutually for drive the cutter horizontal rotation, the tool bit of cutter to the center in second holding chamber removes, in order to be located cut the core in the second holding chamber.
5. The dwell coring apparatus of claim 4, wherein each of the cutters is of a triangular configuration.
6. The dwell coring apparatus of claim 1, wherein the pull assembly comprises:
the driving motor is fixedly arranged at the top end of the inner barrel, the power output end is horizontally arranged, and the driving motor is electrically connected with the controller;
the winding drum is coaxially connected with the power output end of the driving motor; and
and one end of the pull rope is fixedly connected with the side wall of the top of the second accommodating cavity, and the other end of the pull rope is wound on the winding drum.
7. The dwell coring apparatus of claim 1, wherein the inner tube assembly further comprises a clamping assembly, the clamping assembly comprising:
the annular sliding rail is arranged in the second accommodating cavity and is positioned above the cutting assembly, and the annular sliding rail is fixedly arranged on the inner wall of the second accommodating cavity and is arranged in a collinear way with the axis of the inner cylinder;
at least two elastic steel sheets are arranged, and each elastic steel sheet is annular and is arranged in the second accommodating cavity at intervals; each elastic steel sheet is provided with an elastic steel sheet first end and an elastic steel sheet second end, the elastic steel sheet first end is hinged with the inner wall of the second accommodating cavity, the hinge axis is arranged along the vertical direction, and the elastic steel sheet second end is arranged on the annular slide rail in a sliding mode; and
at least two second telescopic structures are arranged, and each second telescopic structure is in one-to-one correspondence with each elastic steel sheet; every the second extending structure all has the flexible end of second stiff end and second, the second stiff end with the inner wall in second holding chamber is articulated mutually, the flexible end of second with correspond the elastic steel sheet second end is articulated mutually, is used for the drive the elastic steel sheet second end is close to the first end of elastic steel sheet removes, so that the middle part of elastic steel sheet along the radial inward deformation of inner tube is protruding, and with the core lateral wall butt in the second holding chamber.
8. The dwell coring device of claim 1, wherein a pressure sensor is disposed at a top of the second receiving cavity, the pressure sensor being electrically connected to the controller for monitoring a core entering the second receiving cavity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111062583.7A CN113738298B (en) | 2021-09-10 | 2021-09-10 | Pressure-maintaining coring device |
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| CN202111062583.7A CN113738298B (en) | 2021-09-10 | 2021-09-10 | Pressure-maintaining coring device |
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| CN113738298B true CN113738298B (en) | 2022-04-26 |
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| CN115263216B (en) * | 2022-08-11 | 2023-12-22 | 山东鲁建土木工程有限公司 | Core drill device for improving broken rock mass sampling rate |
| CN116084871B (en) * | 2023-04-07 | 2023-06-20 | 安徽建筑大学 | Geological exploration drilling equipment |
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