CN112240175B - Freezing sampling device is used to loose stratum in city - Google Patents
Freezing sampling device is used to loose stratum in city Download PDFInfo
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- CN112240175B CN112240175B CN202011078558.3A CN202011078558A CN112240175B CN 112240175 B CN112240175 B CN 112240175B CN 202011078558 A CN202011078558 A CN 202011078558A CN 112240175 B CN112240175 B CN 112240175B
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- 238000007710 freezing Methods 0.000 title claims abstract description 64
- 230000008014 freezing Effects 0.000 title claims abstract description 64
- 238000005070 sampling Methods 0.000 title claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 75
- 239000007788 liquid Substances 0.000 claims description 35
- 238000011010 flushing procedure Methods 0.000 claims description 28
- 238000005755 formation reaction Methods 0.000 claims description 17
- 238000003825 pressing Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 238000005553 drilling Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 36
- 239000011435 rock Substances 0.000 description 28
- 238000001816 cooling Methods 0.000 description 19
- 229910052757 nitrogen Inorganic materials 0.000 description 18
- 230000009471 action Effects 0.000 description 6
- 239000004576 sand Substances 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
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
- E21B25/08—Coating, freezing, consolidating cores; Recovering uncontaminated cores or cores at formation pressure
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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)
- Multiple-Way Valves (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The application discloses a freezing sampling device for an urban unconsolidated formation, which relates to the field of geological exploration sampling equipment and comprises an outer tube, wherein a drill bit is arranged at one end of the outer tube, a core tube communicated with the drill bit is arranged in the outer tube, and a freezing mechanism is arranged in the outer tube and is used for freezing one end, close to the drill bit, of the core tube; the one end that the outer tube deviates from the drill bit is provided with flush fluid inlet channel, forms the rivers passageway of intercommunication flush fluid inlet channel between outer tube and the core pipe to be provided with the drainage runner of intercommunication rivers passageway on the drill bit. The application has the following advantages and effects: the core in the core tube is frozen by additionally arranging the freezing mechanism, the loose core is sealed in the core tube, the core is prevented from falling off in the process of lifting, drilling and coring, and the coring rate of the loose bottom layer is improved.
Description
Technical Field
The application relates to the field of geological exploration sampling equipment, in particular to a freezing sampling device for an urban unconsolidated formation.
Background
Modern industrial and civil large-scale high-rise buildings are mostly based on a quaternary sand and pebble covering layer, and a part of the hydroelectric engineering buildings are also built on the sand and pebble covering layer. Finding out the structure, layering, physical and mechanical properties, permeability and the like of the stratum, particularly the distribution and properties of the sand layer is the basis for guaranteeing the quality and safety of the building, so that the original layer position, original components and particle gradation are kept by stress during sampling.
However, sand gravel formations are generally poor in cementation degree, loose and broken, and the obtained core is afraid of erosion, vibration and abrasion of flushing fluid water flow in the sampling process of a drill bit, so that the problem of falling of the core is very easy to occur in the core extracting process, and the coring rate in the formations is low and needs to be improved.
Disclosure of Invention
In order to improve the coring rate of a loose bottom layer, the application aims to provide a freezing sampling device for an urban loose stratum.
The application provides a freezing sampling device for unconsolidated formation in city adopts following technical scheme: a freezing sampling device for an urban unconsolidated formation comprises an outer tube, wherein a drill bit is arranged at one end of the outer tube, a core tube communicated with the drill bit is arranged in the outer tube, and a freezing mechanism is arranged in the outer tube and is used for freezing one end, close to the drill bit, of the core tube; the outer tube deviates from one end of the drill bit is provided with a flushing fluid inlet channel, a water flow channel communicated with the flushing fluid inlet channel is formed between the outer tube and the core tube, and the drill bit is provided with a drainage flow channel communicated with the water flow channel.
Through adopting above-mentioned technical scheme, when using above-mentioned sampling device, utilize the guide of drill bit, in boring the stratum with the outer tube, the rock core was intraductal along drill bit entering rock core this moment, realized the storage of rock core. And then, starting the freezing mechanism, refrigerating one end of the core barrel close to the drill bit by using the freezing mechanism, and freezing and fixing the core, so that the loose core is sealed in the core barrel, the core is prevented from falling off in the process of lifting and coring, and the coring rate of the loose bottom layer is improved. And during coring, injecting flushing fluid into the water flow channel along the flushing fluid inlet passage, and then discharging the flushing fluid along the drainage flow channel and back onto the formation along the gap between the outer pipe and the wall of the borehole. At the flow in-process of flush fluid, realize the cooling of drill bit, guarantee the normal work of drill bit, also protect the pore wall of drilling simultaneously, avoid the hole phenomenon of collapsing to appear. And in the backflow process of the flushing fluid, the drill cuttings can be automatically taken out of the drill hole, the cleanliness of the drill hole is guaranteed, the drill cuttings are prevented from interfering the drill bit, and therefore the normal work of the drill bit is guaranteed.
Optionally: freezing mechanism is including being located cold source in the outer tube, be provided with the cryovial on the cold source, the core barrel is close to the inside intercommunication that is provided with of one end of drill bit the freezing runner of cryovial.
By adopting the technical scheme, when the core in the core tube is frozen, the cold source is controlled to be opened, the cold source releases liquid nitrogen at the moment, the liquid nitrogen is discharged into the freezing flow channel, and then the core in the core tube can be frozen and stored. Therefore, the structure is simple, liquid nitrogen is used as a freezing raw material of the cold source, efficient cooling and rapid cooling of the core in the core tube are achieved, and rapid sampling of the sampling device is achieved.
Optionally: the freezing flow channel is spirally arranged, and one end deviating from the freezing pipe is communicated with the drainage flow channel.
By adopting the technical scheme, the spiral freezing flow channel is arranged, the movement time and the movement path of liquid nitrogen are increased, so that stable freezing of the rock core in the rock core tube is realized, and normal flowing and efficient freezing of the liquid nitrogen are guaranteed.
Optionally: the freezing pipe comprises a first pipe body communicated with the cold source and a second pipe body communicated with the freezing flow channel, and a sliding pipe is sleeved on the outer wall of the second pipe body; the first pipe body is embedded and connected with the sliding pipe in a sliding mode, and a driving mechanism used for driving the cold source to slide is arranged in the outer pipe; the first body with the second body one end that is close to each other all is provided with the ooff valve to when a pair of the ooff valve is contradicted each other and is compressed tightly, first body intercommunication the second body.
Through adopting above-mentioned technical scheme, when freezing the rock core to the intraductal rock core of rock core, utilize actuating mechanism accuse refrigeration source and first body to be close to the rock core pipe, a pair of ooff valve is close to each other this moment. When a pair of ooff valves contradicts each other and compresses tightly, a pair of ooff valves is opened, and then in the liquid nitrogen in the cold source can flow into second body and freezing runner along first body, realize the high-efficient cooling of the intraductal rock core of rock core. Therefore, automatic discharge of liquid nitrogen is realized by setting the cold source capable of automatically opening and closing, so that full-automatic cooling and efficient cooling of the rock core in the rock core tube are realized.
Optionally: the switch valve comprises a valve body, a valve seat for the first pipe body to abut against is arranged on the valve body on the second pipe body, and a groove is formed in one end, close to the first pipe body, of the valve seat; valve cores are arranged in the valve bodies, return springs are arranged between the ends, which are deviated from each other, of the valve cores and the inner walls of the first pipe body and the second pipe body respectively, and first connecting channels are arranged between the valve bodies and the inner walls of the first pipe body and the second pipe body respectively; the hole diameter of one end, close to each other, of each valve body is arranged in a tapered manner, one end, close to each other, of each valve core is arranged in a tapered manner and is used for pressing the inner wall of the necking of each valve body and plugging the first connecting channel; a thimble is arranged at one end of each valve core close to each other, a valve hole for the thimble to slide is arranged on each valve body in a penetrating way, and a second connecting channel communicated with the first connecting channel is arranged between the outer wall of the thimble and the inner wall of the valve hole; and one end of each thimble, which is close to the thimble, is provided with a valve plate which is mutually abutted, the valve plates are embedded into the grooves, and a connecting gap which is communicated with the second connecting channel is formed between the valve plates and the inner walls of the grooves.
Through adopting above-mentioned technical scheme, when controlling a pair of ooff valve and opening, first body is close to the disk seat on the second body gradually, and the recess is shutoff gradually simultaneously. Meanwhile, the pair of valve plates are positioned in the grooves and are far away from each other under the action of mutually extruded extrusion force, and meanwhile, the valve plates drive the ejector pins and the valve cores to be far away from each other synchronously. After the first pipe body compresses the valve seat, the groove is completely blocked, and meanwhile, the gradually-reduced part of the valve core is completely separated from the inner wall of the reduced opening of the valve body, so that the first connecting channel, the connecting gap and the second connecting channel are communicated with each other, liquid nitrogen can flow along the first connecting channel, the connecting gap and the second connecting channel, and the opening control of the switch valve is realized. When the pair of switch valves are controlled to be closed, the first pipe body is gradually far away from the valve seat on the second pipe body. Meanwhile, under the action of the resilience force of the return spring, the tapered part of the driving valve core is close to and abuts against the inner wall of the tapered part of the valve body, the communicated positions of the first connecting channel and the second connecting channel are blocked, and therefore closing control of the switch valve is achieved. Therefore, by arranging a high-automation switch valve, the automatic opening and closing control of the freezing pipe is realized, namely, the automatic discharge of liquid nitrogen and the automatic freezing of the rock core in the rock core pipe are realized.
Optionally: the second pipe body is connected to the sliding pipe in a sliding mode, and a damping spring is sleeved on the outer wall of the second pipe body.
Through adopting above-mentioned technical scheme, provide certain cushion effect for the second body through setting up damping spring, weaken the impact between first body and the second body to effectually protect the second body, improve the job stabilization nature and the life of whole cryovial.
Optionally: the driving mechanism comprises a driving pipe, the driving pipe is fixed with one end, close to the cold source, of the flushing liquid inlet channel, and a driving rod is arranged at one end, close to the driving pipe, of the cold source; be provided with the drive plate on the actuating lever, the outer wall of drive plate is contradicted the inner wall of drive tube, the drive tube deviates from flush fluid entry channel's one end is provided with the conflict the inner edge of actuating lever inner wall, and the cover is equipped with on the actuating lever and is located the drive plate with return spring between the inner edge.
Through adopting above-mentioned technical scheme, when control cold source opened, the control drive plate drove actuating lever and cold source synchronous motion and is close to the core pipe, and the baffle is pressed and is moved the compression of answer spring this moment, realizes the stable control that the cold source opened simultaneously. When the cold source is controlled to be closed, the acting force on the driving plate is cancelled, and the driving plate, the driving rod and the cold source are driven to synchronously and reversely move under the action of the resilience force of the return spring, so that the cold source is stably controlled to be closed. Therefore, the driving mechanism with a simple mechanism is arranged, so that the reciprocating sliding of the cold source is stably controlled, and the opening and closing of the cold source are stably controlled.
Optionally: the flushing liquid inlet channel comprises a seat body, a water inlet is formed in one end, away from the driving pipe, of the seat body, and a first water inlet channel communicated with one end of the water inlet and the water flow channel is formed in the outer wall of one end, close to the driving pipe, of the seat body; one end of the seat body close to the driving pipe is provided with a second water inlet channel communicated with the other end of the water inlet, an overflow hole is formed in the driving pipe, and a switching mechanism used for switching the first water inlet channel and the second water inlet channel is arranged in the water inlet.
Through adopting above-mentioned technical scheme, when need not to cool off the intraductal rock core of rock core, utilize switching mechanism to carry out the shutoff to second inlet channel, flush fluid can only discharge to rivers passageway along first inlet channel this moment in to realize the unilateral cooling of drill bit. When the rock core that needs were intraductal to the rock core cools off, utilize switching mechanism to carry out the shutoff to first inlet channel, the flush fluid can only discharge to the actuating tube along the second inlet channel this moment, can utilize the pressure control drive plate of flush fluid self to slide afterwards to realize the automatic control that the cold source slided and the stable control that the cold source opened.
Optionally: the switching mechanism comprises a switching pipe which is connected with the water inlet in a sliding mode, the switching pipe is used for independently covering and blocking the first water inlet channel and the second water inlet channel, a boosting spring is arranged between the switching pipe and the bottom wall of the water inlet, and a throwing ball used for driving the switching pipe to slide is arranged in the water inlet.
Through adopting above-mentioned technical scheme, when needs cool off the rock core in the rock core pipe, throw the ball into the inlet, utilize the gravity of ball throwing to exert the effort to the switching tube afterwards, can drive the switching tube and slide this moment, make the switching tube break away from the shutoff to second inlet channel and carry out the shutoff to first inlet channel, realize the independent opening control of second inlet channel to realize the opening and closing control of cold source. When the rock core in the rock core pipe is not required to be cooled, the projectile is taken out, the switching pipe is controlled to move reversely under the action of the resilience force of the boosting spring, the switching pipe is separated from the first water inlet channel to block the second water inlet channel, and the independent opening control of the first water inlet channel is realized. Therefore, the switching mechanism with ingenious structure is arranged, the stable control of the free switching of the first water inlet channel and the second water inlet channel is realized, and the stable opening and closing control of a cold source is realized.
Optionally: the switching pipe is arranged at one end, away from the boosting spring, of the switching pipe in a flaring shape.
Through adopting above-mentioned technical scheme, through setting up the switching pipe of flaring form for the switching pipe is blocked to can be tighter pressing close to more to the throwing ball, avoids appearing the phenomenon of leaking, thereby realizes switching mechanism's stable switching control.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the core in the core tube is frozen by additionally arranging the freezing mechanism, so that the loose core is sealed in the core tube, the core is prevented from falling off in the process of lifting and coring, and the coring rate of the loose bottom layer is improved;
2. by the simple structure and the adoption of liquid nitrogen as a freezing raw material of a cold source, the efficient cooling and the rapid cooling of the core in the core tube are realized, and the rapid sampling of the sampling device is further realized;
3. by arranging a highly-automatic driving mechanism and a highly-automatic control mechanism, the automatic start-stop control of a cold source and the automatic discharge of liquid nitrogen are realized, so that the full-automatic cooling and the efficient cooling of the rock core in the rock core tube are realized;
4. the automatic opening and closing control of the freezing pipe is realized by arranging a highly automatic switch valve, namely, the automatic discharge of liquid nitrogen and the automatic freezing of the rock core in the rock core pipe are realized;
5. through setting up the ingenious switching mechanism of structure, realize the stable control that first inlet channel and second inlet channel freely switched, realize the stable start-stop control of cold source promptly.
Drawings
FIG. 1 is a schematic configuration diagram illustrating an activated state of a freezing mechanism according to an embodiment;
FIG. 2 is a schematic structural view of the non-activated state of the freezing mechanism of the embodiment;
FIG. 3 is a structural schematic view of an open state of the on-off valve of the embodiment;
fig. 4 is a structural schematic view of a closed state of the on-off valve of the embodiment.
Reference numerals: 1. an outer tube; 11. a water flow channel; 2. a drill bit; 21. a drainage flow channel; 3. a flushing fluid inlet passage; 31. a base body; 32. a water inlet; 33. a water inlet channel; 34. a first water inlet channel; 35. a second water inlet channel; 36. an overflow aperture; 4. a core barrel; 41. a freezing flow channel; 5. a freezing mechanism; 51. a cold source; 52. a freezing pipe; 53. a first pipe body; 54. a second tube body; 55. a sliding tube; 56. a damping spring; 6. a drive mechanism; 61. a drive tube; 62. a drive rod; 63. a drive plate; 64. an inner edge; 65. a return spring; 7. an on-off valve; 71. a valve body; 72. a valve seat; 73. a groove; 74. a valve core; 741. a thimble; 742. a valve plate; 75. a return spring; 76. a first connecting channel; 77. a valve bore; 78. a second connecting channel; 79. a connection gap; 8. a switching mechanism; 81. switching the tube; 82. a boosting spring; 83. and (6) throwing the ball.
Detailed Description
The present application is described in further detail below with reference to the attached drawings.
As shown in fig. 1 and 2, the freezing sampling device for the urban unconsolidated formation comprises an outer pipe 1, wherein one end of the outer pipe 1 is provided with a drill bit 2, and the other end is provided with a flushing liquid inlet channel 3. Wherein the outer tube 1 is composed of a plurality of sections of tube bodies and joints positioned between two adjacent tube bodies.
As shown in fig. 1 and 2, a core tube 4 communicated with the drill bit 2 is arranged in the outer tube 1, and one end of the core tube 4 departing from the drill bit 2 is arranged in a sealing shape,
as shown in fig. 1 and 2, an annular water flow passage 11 communicating with the flushing fluid inlet passage 3 is formed between the outer pipe 1 and the core pipe 4, and a plurality of drainage flow passages 21 communicating with the water flow passage 11 are provided at intervals on the drill bit 2.
When the sampling device is installed on a drill rod, the whole outer pipe 1 is controlled to rotate, and the outer pipe 1 is drilled into the stratum by the guide of the drill bit 2. At this time, the core enters the core barrel 4 along the drill bit 2, and the storage of the core is realized.
At the same time, flushing liquid is injected into the water flow channel 11 along the flushing liquid inlet channel 3, and then the flushing liquid is discharged along the drainage flow channel 21 and flows back to the formation along the gap between the outer pipe 1 and the wall of the borehole. And in the process of the flow channel of the flushing fluid, on one hand, the cooling of the drill bit 2 can be realized, and the normal work of the drill bit 2 is ensured.
On the other hand also protects the pore wall of drilling, avoids the hole phenomenon of collapsing to in the backward flow in-process of flush fluid, can also take the drill chip out of the drilling automatically, guarantee the cleanliness factor of drilling, avoid the drill chip to cause the interference to drill bit 2.
As shown in fig. 1 and 2, a freezing mechanism 5 is provided in the outer tube 1, and the freezing mechanism 5 is used to freeze one end of the core tube 4 near the drill 2.
As shown in fig. 1 and 2, the freezing mechanism 5 includes a cold source 51 located inside the outer tube 1, and a freezing tube 52 is disposed on the cold source 51.
As shown in fig. 1 and 2, a freezing flow passage 41 communicating with the freezing pipe 52 is provided inside one end of the core pipe 4 close to the drill 2, and the freezing flow passage 41 is spirally provided and communicates with the drainage flow passage 21 at one end away from the freezing pipe 52.
When the outer tube 1 is drilled into the formation, the core is stored in the core tube 4, and then the controlled cooling source 51 is turned on, at which time the cooling source 51 releases liquid nitrogen and discharges the liquid nitrogen into the spiral freezing flow passage 41.
And the core in the core tube 4 can be frozen and stored later when the liquid nitrogen flows. Therefore, the loose core is sealed in the core tube 4, the core is prevented from falling off in the process of lifting the drill bit and coring, and the coring rate of the loose bottom layer is improved.
As shown in fig. 2 and 3, the freezing pipe 52 includes a first pipe 53 in communication with the cold source 51 and a second pipe 54 in communication with the freezing flow path 41. The outer wall of the second tube 54 is fitted with a sliding tube 55, and the sliding tube 55 is fixed to the core tube 4.
As shown in fig. 2 and 3, the first tube 53 and the second tube 54 are both embedded and slidably connected to the sliding tube 55, the outer wall of the second tube 54 is sleeved with a damping spring 56 abutting against the outer wall of the core tube 4, and the outer tube 1 is provided with a driving mechanism 6 for driving the cold source 51 to slide.
As shown in fig. 2 and 3, the ends of the first tube 53 and the second tube 54 close to each other are provided with the on-off valves 7, and when the pair of on-off valves 7 are pressed against each other, the pair of on-off valves 7 are in an open state, and the first tube 53 communicates with the second tube 54.
When the core in the core barrel 4 is frozen, the driving mechanism 6 controls the cooling source 51 and the first tube body 53 to approach the core barrel 4, and the pair of on-off valves 7 approach each other. When the pair of switch valves 7 are abutted against each other and pressed, the pair of switch valves 7 are opened, and then the liquid nitrogen in the cold source 51 can flow into the second pipe body 54 and the freezing flow passage 41 along the first pipe body 53, so that the efficient cooling of the core in the core barrel 4 is realized.
When the core in the core barrel 4 does not need to be frozen, the driving mechanism 6 is used to control the cooling source 51 and the first pipe body 53 to be away from the core barrel 4, and at the moment, the pair of switch valves 7 are away from each other. Until the pair of on-off valves 7 are completely separated, the pair of on-off valves 7 are closed, and then the automatic closing control of the cool source 51 is realized.
As shown in FIGS. 1 and 2, the driving mechanism 6 comprises a driving pipe 61, the driving pipe 61 is fixed to one end of the washing liquid inlet passage 3 near the cold source 51, and a driving rod 62 is provided at one end of the cold source 51 near the driving pipe 61.
As shown in fig. 1 and 2, a driving plate 63 is disposed at an end of the driving rod 62 facing away from the cold source 51, and an outer wall of the driving plate 63 abuts against an inner wall of the driving pipe 61.
As shown in fig. 1 and 2, an inner edge 64 abutting against the inner wall of the driving rod 62 is provided at an end of the driving tube 61 away from the flushing liquid inlet passage 3, and a return spring 65 is sleeved on the driving rod 62 and located between the driving plate 63 and the inner edge 64.
As shown in fig. 1 and 2, the flushing liquid inlet passage 3 includes a seat body 31, a water inlet 32 is disposed at an end of the seat body 31 away from the driving pipe 61, and an end of the water inlet 32 away from the driving pipe 61 is flared to form a water inlet passage 33.
As shown in fig. 1 and fig. 2, a first water inlet channel 34 is disposed on an outer wall of one end of the seat body 31 close to the driving pipe 61, and two ends of the first water inlet channel 34 are respectively communicated with one end of the water inlet 32 and the water flow channel 11. The end surface of the seat body 31 near one end of the driving pipe 61 is provided with a second water inlet channel 35 communicated with the other end of the water inlet 32.
As shown in fig. 1 and 2, the overflow hole 36 is provided at a middle position of the driving pipe 61, and the switching mechanism 8 for switching the first water inlet passage 34 and the second water inlet passage 35 is provided in the water inlet 32.
When need not to cool off the rock core in the core barrel 4, utilize switching mechanism 8 to carry out the shutoff to second inlet channel 35, flush fluid can only discharge to rivers passageway 11 along first inlet channel 34 this moment in to realize the unilateral cooling of drill bit 2.
When the core in the core tube 4 needs to be cooled, the first water inlet channel 34 is blocked by the switching mechanism 8, and at the moment, the flushing liquid can be discharged into the driving tube 61 only along the second water inlet channel 35. Then, the pressure of the flushing liquid can be used for controlling the driving plate 63 to slide below the overflow hole 36, and the driving plate 63 drives the driving rod 62 and the cold source 51 to synchronously move and close to the core tube 4.
Meanwhile, the baffle pressing return spring 65 compresses, and meanwhile, the stable control of the opening of the cold source 51 is realized. And redundant flushing liquid overflows along the overflow hole 36 and is discharged into the water flow channel 11, so that the unilateral cooling and temperature reduction of the drill bit 2 are realized.
As shown in fig. 1 and 2, the switching mechanism 8 includes a switching pipe 81 slidably connected to the water inlet 32, and the switching pipe 81 is used for individually covering and blocking the first water inlet passage 34 and the second water inlet passage 35.
As shown in fig. 1 and 2, an assist spring 82 is provided between the switching tube 81 and the bottom wall of the water inlet 32, a throwing ball 83 for driving the switching tube 81 to slide is provided in the water inlet 32, and one end of the switching tube 81, which is away from the assist spring 82, is flared.
When the core in the core barrel 4 needs to be cooled, the slinger 83 is thrown into the water inlet 32, and then the gravity of the slinger 83 applies an acting force to the switching tube 81, so that the switching tube 81 can be driven to slide, the switching tube 81 is separated from the second water inlet channel 35 to plug the first water inlet channel 34, the independent opening control of the second water inlet channel 35 is realized, and the opening and closing control of the cold source 51 is realized.
When the core in the core barrel 4 is not required to be cooled, the projectile 83 is taken out, the switching tube 81 is controlled to move reversely under the action of the resilience force of the boosting spring 82, the switching tube 81 is separated from the first water inlet channel 34 to block the second water inlet channel 35, the independent opening control of the first water inlet channel 34 is realized, and the closing control of the cold source 51 is realized.
As shown in fig. 3 and 4, the on-off valve 7 includes a hollow valve body 71, a valve seat 72 against which the first pipe 53 abuts is provided on the valve body 71 of the second pipe 54, and a groove 73 is provided at one end of the valve seat 72 close to the first pipe 53.
As shown in fig. 3 and 4, a valve body 74 is provided in each of the pair of valve bodies 71, and the valve body 74 is slidably connected to the valve body 71. A return spring 75 is provided between one end of the pair of valve spools 74 that faces away from each other and the inner walls of the first and second tubes 53 and 54, respectively, and an annular first connecting passage 76 is provided between the pair of valve bodies 71 and the inner walls of the first and second tubes 53 and 54.
As shown in fig. 3 and 4, the pair of valve bodies 71 have a tapered bore at their ends adjacent to each other, and the pair of valve spools 74 have a tapered bore at their ends adjacent to each other, and are configured to press against the inner wall of the valve bodies 71 at the constricted portions and close the first connecting passages 76.
As shown in fig. 3 and 4, the pair of valve elements 74 are provided with ejector pins 741 at their ends adjacent to each other, the pair of valve elements 71 are provided with valve holes 77 through which the ejector pins 741 slide, and a second connection passage 78 is provided between an outer wall of the ejector pins 741 and an inner wall of the valve holes 77 to communicate with the first connection passage 76.
As shown in fig. 3 and 4, the pair of ejector pins 741 have valve plates 742 abutting against each other at both ends thereof, the pair of valve plates 742 are fitted into the recess 73, and a connection gap 79 communicating with the second connection passage 78 is formed between the valve plates 742 and the inner wall of the recess 73.
When the pair of on-off valves 7 is controlled to open, the first pipe 53 is gradually brought close to the valve seat 72 on the second pipe 54, and the groove 73 is gradually closed. Meanwhile, the pair of valve plates 742 are located in the grooves 73 and are separated from each other by the pressing force of the pressing force, and the valve plates 742 drive the needle 741 and the valve core 74 to be simultaneously separated from each other.
Until the first pipe 53 presses the valve seat 72, the groove 73 is completely blocked, and the tapered portion of the valve element 74 completely separates from the inner wall of the constricted portion of the valve body 71, so that the first connecting passage 76, the connecting gap 79, and the second connecting passage 78 are communicated with each other, and liquid nitrogen can flow along the first connecting passage 76, the connecting gap 79, and the second connecting passage 78, thereby realizing the opening control of the on-off valve 7.
When the pair of on-off valves 7 are controlled to be closed, the first pipe 53 is gradually moved away from the valve seat 72 on the second pipe 54. Meanwhile, under the action of the resilient force of the return spring 75, the tapered portion of the drive valve element 74 approaches and abuts against the inner wall of the tapered portion of the valve body 71, so that the communication position between the first connecting passage 76 and the second connecting passage 78 is blocked, and the closing control of the on-off valve 7 is realized.
The working principle is as follows: when the sampling device is operated, the outer tube 1 and the drill bit 2 are rotated and drilled into the formation, while the core is moved along the drill bit 2 into the core barrel 4 and stored in the core barrel 4. At the same time, the flushing liquid flows through the water flow channel 11 and the drainage flow channel 21 and flows back to the formation along the gap between the outer pipe 1 and the wall of the borehole. Then, the throwing ball 83 is adopted to realize the automatic switching of the flow direction of the flushing liquid, the cold source 51 is controlled to slide and be started, then the cold source 51 releases liquid nitrogen, the end, close to the drill bit 2, of the core barrel 4 is refrigerated, and meanwhile, the loose core is frozen and sealed in the core barrel 4, and the stable taking out of the core is guaranteed.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. The utility model provides a loose stratum in city is with freezing sampling device which characterized in that: the drill bit comprises an outer tube (1), wherein a drill bit (2) is arranged at one end of the outer tube (1), a core tube (4) communicated with the drill bit (2) is arranged in the outer tube (1), a freezing mechanism (5) is arranged in the outer tube (1), and the freezing mechanism (5) is used for freezing one end, close to the drill bit (2), of the core tube (4);
a flushing fluid inlet channel (3) is formed in one end, away from the drill bit (2), of the outer pipe (1), a water flow channel (11) communicated with the flushing fluid inlet channel (3) is formed between the outer pipe (1) and the core barrel (4), and a drainage flow channel (21) communicated with the water flow channel (11) is formed in the drill bit (2);
the freezing mechanism (5) comprises a cold source (51) positioned in the outer pipe (1), a freezing pipe (52) is arranged on the cold source (51), and a freezing flow channel (41) communicated with the freezing pipe (52) is arranged inside one end, close to the drill bit (2), of the core pipe (4);
the freezing pipe (52) comprises a first pipe body (53) communicated with the cold source (51) and a second pipe body (54) communicated with the freezing flow channel (41), and a sliding pipe (55) is sleeved on the outer wall of the second pipe body (54);
the first pipe body (53) is embedded and connected with the sliding pipe (55) in a sliding manner, and a driving mechanism (6) for driving the cold source (51) to slide is arranged in the outer pipe (1);
one ends, close to each other, of the first pipe body (53) and the second pipe body (54) are provided with switch valves (7), and when a pair of the switch valves (7) are pressed against each other, the first pipe body (53) is communicated with the second pipe body (54);
the switch valve (7) comprises a valve body (71), a valve seat (72) which is abutted by the first pipe body (53) is arranged on the valve body (71) on the second pipe body (54), and a groove (73) is formed in one end, close to the first pipe body (53), of the valve seat (72);
valve cores (74) are arranged in the valve bodies (71), a return spring (75) is arranged between one end, away from each other, of each valve core (74) and the inner walls of the first pipe body (53) and the second pipe body (54), and a first connecting channel (76) is arranged between each valve body (71) and the inner walls of the first pipe body (53) and the second pipe body (54);
the hole diameters of the ends, close to each other, of the valve bodies (71) are arranged in a tapered mode, the ends, close to each other, of the valve cores (74) are arranged in a tapered mode and used for pressing the inner wall of the necking position of the valve bodies (71) and blocking the first connecting channel (76);
a thimble (741) is arranged at one end of each of the valve cores (74) close to each other, a valve hole (77) for the thimble (741) to slide is arranged on each of the valve bodies (71), and a second connecting channel (78) communicated with the first connecting channel (76) is arranged between the outer wall of the thimble (741) and the inner wall of the valve hole (77);
one ends of the pair of thimbles (741) close to each other are provided with valve plates (742) which are mutually abutted, the pair of valve plates (742) are embedded into the grooves (73), and a connecting gap (79) which is communicated with the second connecting channel (78) is formed between the valve plates (742) and the inner walls of the grooves (73).
2. The freeze sampling device for unconsolidated formation of a city according to claim 1, wherein: the freezing flow channel (41) is spirally arranged, and one end deviating from the freezing pipe (52) is communicated with the drainage flow channel (21).
3. The freeze sampling device for unconsolidated formation of a city according to claim 1, wherein: the second pipe body (54) is connected to the sliding pipe (55) in a sliding mode, and a damping spring (56) is sleeved on the outer wall of the second pipe body (54).
4. The freeze sampling device for unconsolidated formation of a city according to claim 1, wherein: the driving mechanism (6) comprises a driving pipe (61), the driving pipe (61) is fixed with one end, close to the cold source (51), of the flushing liquid inlet channel (3), and a driving rod (62) is arranged at one end, close to the driving pipe (61), of the cold source (51);
be provided with drive plate (63) on actuating lever (62), the outer wall of drive plate (63) is contradicted the inner wall of drive tube (61), drive tube (61) deviates from the one end of flushing liquid entry way (3) is provided with the conflict inner edge (64) of drive plate (62) inner wall, and the cover is equipped with on drive plate (62) and is located drive plate (63) with return spring (65) between inner edge (64).
5. A frozen sampling device for unconsolidated formations of a city according to claim 4, wherein: the flushing liquid inlet channel (3) comprises a seat body (31), a water inlet (32) is formed in one end, away from the driving pipe (61), of the seat body (31), and a first water inlet channel (34) communicated with one end of the water inlet (32) and the water flow channel (11) is formed in the outer wall of one end, close to the driving pipe (61), of the seat body (31);
one end, close to the driving pipe (61), of the seat body (31) is provided with a second water inlet channel (35) communicated with the other end of the water inlet (32), an overflow hole (36) is formed in the driving pipe (61), and a switching mechanism (8) used for switching the first water inlet channel (34) and the second water inlet channel (35) is arranged in the water inlet (32).
6. A frozen sampling device for unconsolidated formations of a city according to claim 5, wherein: the switching mechanism (8) comprises a switching pipe (81) which is connected with the water inlet (32) in a sliding mode, the switching pipe (81) is used for independently covering and blocking the first water inlet channel (34) and the second water inlet channel (35), a boosting spring (82) is arranged between the switching pipe (81) and the bottom wall of the water inlet (32), and a throwing ball (83) used for driving the switching pipe (81) to slide is arranged in the water inlet (32).
7. The freeze sampling device for unconsolidated formation of a city according to claim 6, wherein: one end of the switching tube (81) departing from the boosting spring (82) is arranged in a flaring shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011078558.3A CN112240175B (en) | 2020-10-10 | 2020-10-10 | Freezing sampling device is used to loose stratum in city |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011078558.3A CN112240175B (en) | 2020-10-10 | 2020-10-10 | Freezing sampling device is used to loose stratum in city |
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| Publication Number | Publication Date |
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| CN112240175A CN112240175A (en) | 2021-01-19 |
| CN112240175B true CN112240175B (en) | 2022-08-02 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4256192A (en) * | 1979-07-06 | 1981-03-17 | Christensen, Inc. | Pressure core barrel |
| CN101864916B (en) * | 2010-05-27 | 2013-01-30 | 吉林大学 | Hole bottom freezing cord coring drill and coring method thereof |
| CN207920565U (en) * | 2018-03-01 | 2018-09-28 | 中国地质调查局油气资源调查中心 | A kind of mud shale chip resistant self set-up type chilled sampling apparatus |
| CN109113612B (en) * | 2018-09-03 | 2020-06-12 | 吉林大学 | Hammer type freezing and pressure maintaining double-acting rope sampling drilling tool and method for natural gas hydrate |
| CN109736735B (en) * | 2018-12-20 | 2021-08-10 | 中国地质调查局成都地质调查中心 | Portable loose fragile rock stratum in-situ sample collecting device |
| CN111677503A (en) * | 2020-05-22 | 2020-09-18 | 福建省华力勘测设计有限公司 | Sand bed probing sampling drilling tool |
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