CN216043655U - Reverse gravel throwing device - Google Patents
Reverse gravel throwing device Download PDFInfo
- Publication number
- CN216043655U CN216043655U CN202122714372.9U CN202122714372U CN216043655U CN 216043655 U CN216043655 U CN 216043655U CN 202122714372 U CN202122714372 U CN 202122714372U CN 216043655 U CN216043655 U CN 216043655U
- Authority
- CN
- China
- Prior art keywords
- gravel
- adapter
- cover plate
- pipe
- return cover
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a reverse gravel feeding device.A gravel feeding valve body comprises an adapter, a lower branch pipe, a gravel non-return cover plate and a reset element, wherein the top end of the adapter is used for being connected with a built-in filter, the bottom end of the adapter is hermetically connected with the top end of the lower branch pipe, the gravel non-return cover plate is movably connected to a port at the bottom end of the adapter, a sand setting hole capable of preventing gravel from passing is arranged on the gravel non-return cover plate, the reset element can provide reset force to enable the gravel non-return cover plate to keep blocking the port at the bottom end of the adapter, and a diversion trench is arranged at the bottom end of the lower branch pipe; connect the body top be used for with throw gravel pipe sealing connection, connect the body bottom and connect the propelling movement pole, insert in the adapter and with adapter sealing connection when connecting the body bottom, the propelling movement pole can overcome reset element reset force and promote and open gravel material non return apron. The utility model ensures that the gravel material is not discharged back, the gravel material non-return cover plate can not rebound due to the change of water flow, the gravel throwing effect is ensured, the accumulation of settled sand in the built-in filter can be avoided, the pumping and injecting effect is ensured, and the well washing cost is reduced.
Description
Technical Field
The utility model relates to the technical field of in-situ leaching uranium mining, in particular to a reverse gravel feeding device which is used for feeding gravel into in-situ leaching uranium mining production wells and general hydrological water wells.
Background
The in-situ leaching uranium mining production well is the only channel for metal mining of in-situ leaching sandstone type uranium mines. The channel is composed of a sleeve, a filter and a sand setting pipe from top to bottom, is a working channel for forming hydraulic connection between the earth surface and a water-containing layer, and is called a production column.
The existing in-situ leaching uranium mining production well structure is basically a gravel-filled type drilling structure, and the gravel throwing process is that after drilling is completed, a sand settling pipe, a filter and an upper casing pipe are sequentially connected and installed in the drilling well; and then a gravel casting grouting pipe is put between the casing and the well wall to the position of the filter, gravel is filled in the forward direction, and then grouting and well cementation are carried out. The process is suitable for the conditions of stable stratum structure and single ore bed, and has limitation on the exploitation of mines with easy-shrinkage stratum, multi-ore bed and the like.
Gravel materials are filled among the filter, the sand settling pipe and the ore bed, so that the ore bed and the surrounding stratum are prevented from collapsing, and a supporting and protecting effect is formed; secondly, gaps exist among the gravel materials, so that ore layer sand grains with certain diameters can be prevented from entering the production column, and the pumping and injection liquid is influenced.
The gravel throwing mode has the advantages of relatively firm gravel material stacking and low cost for shallow wells. However, for deep wells, the forward gravel throwing is relatively difficult, the gravel throwing time is long, and gravel is easy to grade and bridge; in particular, when there are many aquifers or multi-purpose seams, it is difficult to fill gravel in multiple layers by using multiple layers of filter pipes.
Aiming at the defects of common gravel-packed wells, by referring to the experience of oil exploitation, the field of in-situ leaching uranium mining is researched and applied with other drilling structures, such as a secondary well-forming drilling construction process, so that the purpose is to realize the accurate control of the seepage range of a leaching agent and obtain leachate with ideal uranium concentration and flow. The construction process includes installing casing after bare hole construction, reverse cement slurry injection in the whole hole, cutting in the target ore layer, setting built-in filter and reverse gravel throwing. The reverse gravel throwing is carried out through a gravel throwing pipe, a one-way valve is opened by the water pressure of a water pump, gravel materials are brought in through water flow, and then the water is returned through a built-in filter. The currently used gravel throwing device has the following defects: firstly, the gravel throwing pipe and the gravel throwing device are not sealed, water flow cannot completely enter the gravel throwing device, and gravel materials are returned and discharged in the sleeve along with the water flow; secondly, the gravel material non-return cover plate can rebound along with the change of water flow, and the valve is not opened completely, so that the gravel throwing effect is influenced; and thirdly, a sand setting pipe is not arranged on a part of built-in filters, so that pumping and injection are influenced when sand setting is accumulated in the filters, and the well washing cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a reverse gravel feeding device, which solves the problems in the prior art, prevents gravel materials from returning, improves gravel feeding effect, and can avoid accumulation of settled sand in a built-in filter, thereby ensuring pumping and injecting effect and reducing well washing cost.
In order to achieve the purpose, the utility model provides the following scheme:
the utility model provides a reverse gravel throwing device, which comprises a gravel throwing valve body and a gravel throwing pipe sealing joint, wherein the gravel throwing valve body is provided with a gravel inlet pipe and a gravel outlet pipe;
the gravel-throwing valve body comprises an adapter, a lower branch pipe, a gravel non-return cover plate and a reset element, wherein the top end of the adapter is used for being connected with a built-in filter, the bottom end of the adapter is hermetically connected and communicated with the top end of the lower branch pipe, the gravel non-return cover plate is movably connected to a bottom end port of the adapter, a sand setting hole capable of preventing gravel from passing through is formed in the gravel non-return cover plate, the reset element can provide reset force to enable the gravel non-return cover plate to keep blocking the bottom end port of the adapter, and a flow guide groove communicated with the inside and the outside of the lower branch pipe is formed in the bottom end of the lower branch pipe;
throw gravel pipe sealing joint including connecting body and propelling movement pole, connect the body top be used for with throw gravel pipe sealing connection, connect the body bottom and connect the propelling movement pole, connect the body bottom and be used for inserting in the adapter top and with adapter sealing connection and intercommunication work as connect the body bottom and insert in the adapter top and with during adapter sealing connection, the propelling movement pole can overcome reset element's restoring force promotes and opens gravel material non return apron.
Preferably, the top end of the adapter is provided with an internal thread used for being connected with a built-in filter, and the bottom end of the adapter is provided with an external thread connected with the top end of the lower support pipe.
Preferably, the top of the joint body is provided with an internal thread used for being in sealing connection with the gravel throwing pipe, the bottom of the joint body is provided with an inverted cone-shaped peripheral surface, and the inside of the adapter is provided with an inverted cone-shaped inner peripheral surface matched with the inverted cone-shaped peripheral surface.
Preferably, an annular sealing groove is formed in the outer peripheral surface of the inverted cone, and an O-shaped sealing ring is arranged in the annular sealing groove.
Preferably, the bottom end of the connector body is provided with a connecting plate, the connecting plate is provided with a discharge hole, and the pushing rod is fixedly connected to the connecting plate.
Preferably, the gravel non-return cover plate is rotatably connected with the bottom end of the adapter through a rotating shaft, the reset element is a reset spring, and the reset spring is arranged on the rotating shaft.
Preferably, the flow guide grooves are provided in plurality, and the flow guide grooves are arranged on the outer peripheral surface of the lower support pipe and are uniformly distributed along the circumferential direction of the lower support pipe.
Preferably, two annular seal grooves are arranged on the reverse conical outer peripheral surface at intervals along the axial direction of the reverse conical outer peripheral surface, and one O-shaped seal ring is arranged in each annular seal groove.
Compared with the prior art, the utility model has the following technical effects:
according to the reverse gravel feeding device provided by the utility model, after the gravel feeding pipe is hermetically connected with the gravel feeding pipe sealing joint, the gravel feeding pipe sealing joint is inserted into the adapter and is hermetically connected with the adapter, the push rod overcomes the reset force of the reset element to push and open the gravel material non-return cover plate, gravel materials and water are pumped into the gravel feeding pipe, the gravel materials enter a space to be fed from the diversion trench, the water is returned to a well head through the built-in filter, after the gravel feeding work is finished, the gravel feeding pipe and the gravel feeding pipe sealing joint are lifted, and the gravel material non-return cover plate resets and seals the bottom end port of the adapter under the reset force of the reset element; the utility model can be connected with the gravel feeding pipe and the adapter in a sealing way through the gravel feeding pipe sealing joint, and can open the gravel material non-return cover plate through the pushing rod, thereby avoiding the situation that the gravel material is reversely discharged into the sleeve pipe because the gravel feeding pipe and the gravel feeding device are not sealed, and the gravel material non-return cover plate can not rebound due to the change of water flow, thereby ensuring the gravel feeding effect, after the gravel feeding work is finished, the gravel feeding pipe and the gravel feeding pipe sealing joint are lifted, the gravel material non-return cover plate resets and blocks the bottom end port of the adapter under the reset force of the reset element, thereby preventing the gravel material from entering the sleeve pipe through the gravel material non-return cover plate, and for the built-in filter without the sand settling pipe, the sand can enter the cutting space through the sand settling hole on the gravel material non-return cover plate in the built-in filter, thereby utilizing the space which is not filled with the gravel material in the cutting space to contain a part of the sand, and the sand setting is prevented from being accumulated in the built-in filter, so that the pumping and injecting effect is ensured, and the well washing cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a reverse gravel-throwing apparatus according to the present invention;
FIG. 2 is a half-sectional view of a gravel-throwing valve body in the reverse gravel-throwing device provided by the present invention;
FIG. 3 is a partially enlarged view of a portion I of the valve body of the gravel valve in FIG. 2;
FIG. 4 is a schematic perspective view of a gravel check cover plate in the valve body of the gravel valve of FIG. 2;
FIG. 5 is a front view of the gravel check cover plate of FIG. 4;
FIG. 6 is a left side view of the gravel check cover plate of FIG. 5;
FIG. 7 is a half sectional view of a gravel-casting pipe sealing joint in the reverse gravel-casting device provided by the present invention;
FIG. 8 is a schematic view of the connection between the connection plate and the push rod in the gravel pipe sealing joint in FIG. 7;
in the figure: 100-reverse gravel feeding device, 1-gravel feeding valve body, 2-gravel feeding pipe sealing joint, 3-adapter, 4-lower branch pipe, 5-gravel non-return cover plate, 6-reset element, 7-sand setting hole, 8-diversion trench, 9-joint body, 10-pushing rod, 11-inverted cone outer peripheral surface, 12-inverted cone inner peripheral surface, 13-annular sealing groove, 14-O-shaped sealing ring, 15-connecting plate, 16-discharge hole and 17-rotating shaft.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model aims to provide a reverse gravel feeding device, which solves the problems in the prior art, prevents gravel materials from returning, improves gravel feeding effect, and can avoid accumulation of settled sand in a built-in filter, thereby ensuring pumping and injecting effect and reducing well washing cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-8, the present embodiment provides a reverse gravel-throwing device 100, which comprises a gravel-throwing valve body 1 and a gravel-throwing pipe sealing joint 2;
the gravel throwing valve body 1 comprises an adapter 3, a lower branch pipe 4, a gravel non-return cover plate 5 and a reset element 6, the top end of the adapter 3 is used for being connected with a built-in filter, the bottom end of the adapter 3 is hermetically connected and communicated with the top end of the lower branch pipe 4, the gravel non-return cover plate 5 is movably connected to a bottom end port of the adapter 3, a sand setting hole 7 capable of preventing gravel from passing through is formed in the gravel non-return cover plate 5, the reset element 6 can provide reset force to enable the gravel non-return cover plate 5 to keep plugging the bottom end port of the adapter 3, and a flow guide groove 8 communicated with the inside and the outside of the lower branch pipe 4 is formed in the bottom end of the lower branch pipe 4;
throw gravel pipe sealing joint 2 including connecting body 9 and propelling movement pole 10, connect 9 tops of body to be used for with throw gravel pipe sealing connection, connect 9 bottom of body to connect propelling movement pole 10, connect 9 bottoms of body to be used for inserting in 3 tops of adapter and with 3 sealing connection of adapter and intercommunication, when connecting 9 bottoms of body insert in 3 tops of adapter and with 3 sealing connection of adapter, propelling movement pole 10 can overcome reset force promotion of reset element 6 and open gravel material non return apron 5.
When the gravel throwing valve is used, the gravel throwing valve body 1, the built-in filter and the packer are sequentially connected from bottom to top, and then the gravel throwing valve body 1, the built-in filter and the packer are installed at the designed positions in a drill hole through a drill rod; after the packer is pressed and set, a drill rod and a setting tool are lifted out; sequentially connecting the gravel-throwing pipe sealing joint 2 and the gravel-throwing pipe and putting the gravel-throwing pipe into a sleeve, so that the bottom end of the joint body 9 is hermetically connected with the adapter 3, and the pushing rod 10 pushes and opens the gravel non-return cover plate 5; connecting the gravel feeding pipe with a slurry pump, opening the slurry pump, pumping gravel materials and water into the gravel feeding pipe, enabling the gravel materials to enter a space to be fed from the diversion trench 8, and discharging the water back to a wellhead through a built-in filter; after the gravel feeding work is finished, the slurry pump is closed, the gravel feeding pipe and the gravel feeding pipe sealing joint 2 are lifted, and the gravel material non-return cover plate 5 resets and blocks the bottom end port of the adapter 3 under the action of the resetting force of the resetting element 6. The gravel-feeding pipe sealing joint 2 can be connected with the gravel-feeding pipe and the adapter 3 in a sealing way, and the gravel material non-return cover plate 5 can be opened through the pushing rod 10, so that the situation that gravel materials are reversely discharged into the sleeve due to the fact that the gravel-feeding pipe and the gravel-feeding device are not sealed is avoided, the gravel material non-return cover plate 5 cannot rebound due to water flow change, the gravel-feeding effect is guaranteed, after the gravel-feeding work is finished, the gravel-feeding pipe and the gravel-feeding pipe sealing joint 2 are lifted, the gravel material non-return cover plate 5 resets and blocks the bottom end port of the adapter 3 under the reset force of the reset element 6, the gravel materials are prevented from entering the sleeve through the gravel material non-return cover plate 5, in addition, as the cut space cannot be filled with 100 percent of gravel materials, a plurality of sand-settling holes 7 are uniformly distributed on the gravel material non-return cover plate 5, and for the built-in filter without the sand-settling pipe, during the normal pumping and injecting production period, part of the produced gravel materials can enter the cutting space through the plurality of the gravel material non-return cover plate 7 on the gravel material non-return filter, thereby utilize the space that does not fill in the cutting space with the gravel material to hold partly grit, avoid the grit to pile up in built-in filter to guarantee to take out and annotate the effect, reduce the well-flushing cost.
As shown in fig. 1-2, in this embodiment, the top end of the adapter 3 is provided with an internal thread for connecting with a built-in filter, and the bottom end of the adapter 3 is provided with an external thread connected with the top end of the lower branch pipe 4, so that the adapter is convenient and reliable to use through threaded connection.
As shown in fig. 1-2 and 7, in this embodiment, the top end of the joint body 9 is provided with an internal thread for sealing connection with the gravel inlet pipe, the bottom end of the joint body 9 is provided with an inverted cone-shaped outer peripheral surface 11, the adapter 3 is provided with an inverted cone-shaped inner peripheral surface 12 matched with the inverted cone-shaped outer peripheral surface 11, the joint body 9 and the adapter 3 are sealed in a conical surface matching manner, and the sealing effect is good.
As shown in fig. 1 and 7, in this embodiment, an annular sealing groove 13 is formed in the inverted conical outer circumferential surface 11, and an O-ring 14 is disposed in the annular sealing groove 13, so as to further improve the sealing effect between the joint body 9 and the adapter 3.
As shown in fig. 7-8, in this embodiment, a connecting plate 15 is disposed at the bottom end of the connector body 9, a discharge hole 16 is disposed on the connecting plate 15, and the push rod 10 is fixedly connected to the connecting plate 15, wherein four discharge holes 16 are uniformly distributed along the circumferential direction of the connecting plate 15, the push rod 10 is fixedly connected to the middle portion of the bottom surface of the connecting plate 15 through the discharge hole 16 with water and gravel, the length of the push rod 10 is determined according to the distance from the bottom surface of the connecting plate 15 to the gravel non-return cover plate 5 after the gravel pipe is put in place to seal the connector body 9 and the adapter 3.
As shown in fig. 1-3, in this embodiment, the gravel non-return cover plate 5 is rotatably connected to the bottom end of the adapter 3 through a rotating shaft 17, the reset element 6 is a reset spring, and the reset spring is disposed on the rotating shaft 17, wherein the reset spring may be a torsion spring, and the gravel non-return cover plate 5 is closed through the reset spring, which is simple in structure and convenient to connect.
As shown in fig. 1-2, in the present embodiment, a plurality of diversion trenches 8 are provided, the plurality of diversion trenches 8 are provided on the outer peripheral surface of the lower branch pipe 4 and are uniformly distributed along the circumferential direction of the lower branch pipe 4, specifically, four diversion trenches 8 are provided, and four diversion trenches 8 are uniformly provided on the outer peripheral surface of the lower branch pipe 4.
As shown in fig. 1 and 7, in the present embodiment, two annular seal grooves 13 are provided on the reverse tapered outer circumferential surface 11 at intervals along the axial direction thereof, and one O-ring 14 is provided in each annular seal groove 13, so as to further improve the sealing effect.
A gravel reverse throwing method based on the gravel reverse throwing device 100 comprises the following steps:
s1: sequentially connecting the gravel throwing valve body 1, the built-in filter and the packer from bottom to top, and then installing the gravel throwing valve body 1, the built-in filter and the packer at a designed position in a drill hole through a drill rod;
s2: after the packer is pressed and set, a drill rod and a setting tool are lifted out;
s3: sequentially connecting the gravel-throwing pipe sealing joint 2 and the gravel-throwing pipe and putting the gravel-throwing pipe into a sleeve, so that the bottom end of the joint body 9 is hermetically connected with the adapter 3, and the pushing rod 10 pushes and opens the gravel non-return cover plate 5;
s4: connecting the gravel feeding pipe with a slurry pump, opening the slurry pump, pumping gravel materials and water into the gravel feeding pipe, enabling the gravel materials to enter a space to be fed from the diversion trench 8, and discharging the water back to a wellhead through a built-in filter;
s5: after the gravel feeding work is finished, the slurry pump is closed, the gravel feeding pipe and the gravel feeding pipe sealing joint 2 are lifted, and the gravel material non-return cover plate 5 resets and blocks the bottom end port of the adapter 3 under the action of the resetting force of the resetting element 6.
The gravel pipe sealing joint 2 can be connected with the gravel pipe and the adapter 3 in a sealing way, and the gravel material non-return cover plate 5 can be opened through the push rod 10, so that the situation that gravel materials are reversely discharged into the sleeve due to the fact that the gravel pipe and the gravel device are not sealed is avoided, the gravel material non-return cover plate 5 cannot rebound due to water flow change, the gravel feeding effect is guaranteed, after the gravel feeding work is finished, the gravel pipe and the gravel pipe sealing joint 2 are lifted, the gravel material non-return cover plate 5 resets and blocks the bottom end port of the adapter 3 under the reset force of the reset element 6, the gravel materials are prevented from entering the sleeve through the gravel material non-return cover plate 5, in addition, as the space after cutting cannot be filled with 100 percent of gravel materials, for the built-in filter without the sand settling pipe, during the normal pumping and injecting production, part of generated settled sands can enter the cutting space through the sand settling hole 7 on the gravel material non-return cover plate 5 in the built-in the filter, thereby utilize the space that does not fill in the cutting space with the gravel material to hold partly grit, avoid the grit to pile up in built-in filter to guarantee to take out and annotate the effect, reduce the well-flushing cost.
In the embodiment, the gravel material is spherical PE gravel material with the particle size of 3-4mm, and has the advantages of convenient manufacture, good chemical stability and corrosion resistance.
The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (8)
1. A gravel reverse throwing device is characterized in that: comprises a gravel throwing valve body and a gravel throwing pipe sealing joint;
the gravel-throwing valve body comprises an adapter, a lower branch pipe, a gravel non-return cover plate and a reset element, wherein the top end of the adapter is used for being connected with a built-in filter, the bottom end of the adapter is hermetically connected and communicated with the top end of the lower branch pipe, the gravel non-return cover plate is movably connected to a bottom end port of the adapter, a sand setting hole capable of preventing gravel from passing through is formed in the gravel non-return cover plate, the reset element can provide reset force to enable the gravel non-return cover plate to keep blocking the bottom end port of the adapter, and a flow guide groove communicated with the inside and the outside of the lower branch pipe is formed in the bottom end of the lower branch pipe;
throw gravel pipe sealing joint including connecting body and propelling movement pole, connect the body top be used for with throw gravel pipe sealing connection, connect the body bottom and connect the propelling movement pole, connect the body bottom and be used for inserting in the adapter top and with adapter sealing connection and intercommunication work as connect the body bottom and insert in the adapter top and with during adapter sealing connection, the propelling movement pole can overcome reset element's restoring force promotes and opens gravel material non return apron.
2. A retrograde gravel placement apparatus according to claim 1, wherein: the adapter top is equipped with the internal thread that is used for being connected with built-in filter, the adapter bottom be equipped with the external screw thread that the lower branch top is connected.
3. A retrograde gravel placement apparatus according to claim 1, wherein: the top of the joint body is provided with an internal thread used for being connected with the gravel throwing pipe in a sealing way, the bottom of the joint body is provided with an inverted cone-shaped peripheral surface, and the inside of the adapter is provided with an inverted cone-shaped inner peripheral surface matched with the inverted cone-shaped peripheral surface.
4. A retrograde gravel placement apparatus according to claim 3, wherein: and an annular sealing groove is formed in the outer peripheral surface of the inverted cone, and an O-shaped sealing ring is arranged in the annular sealing groove.
5. A retrograde gravel placement apparatus according to claim 1, wherein: the connector body bottom is equipped with the connecting plate, be equipped with the discharge opening on the connecting plate, push rod fixed connection be in on the connecting plate.
6. A retrograde gravel placement apparatus according to claim 1, wherein: the gravel non-return cover plate is rotatably connected to the bottom end of the adapter through a rotating shaft, the reset element is a reset spring, and the reset spring is arranged on the rotating shaft.
7. A retrograde gravel placement apparatus according to claim 1, wherein: the flow guide grooves are arranged on the outer peripheral surface of the lower support pipe and are uniformly distributed along the circumferential direction of the lower support pipe.
8. A retrograde gravel placement apparatus according to claim 4, wherein: two annular sealing grooves are arranged on the inverted cone-shaped peripheral surface at intervals along the axial direction of the inverted cone-shaped peripheral surface, and one O-shaped sealing ring is arranged in each annular sealing groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122714372.9U CN216043655U (en) | 2021-11-08 | 2021-11-08 | Reverse gravel throwing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122714372.9U CN216043655U (en) | 2021-11-08 | 2021-11-08 | Reverse gravel throwing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216043655U true CN216043655U (en) | 2022-03-15 |
Family
ID=80614986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122714372.9U Active CN216043655U (en) | 2021-11-08 | 2021-11-08 | Reverse gravel throwing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216043655U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914831A (en) * | 2021-11-08 | 2022-01-11 | 核工业北京化工冶金研究院 | Reverse gravel throwing device and method |
-
2021
- 2021-11-08 CN CN202122714372.9U patent/CN216043655U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113914831A (en) * | 2021-11-08 | 2022-01-11 | 核工业北京化工冶金研究院 | Reverse gravel throwing device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203081411U (en) | Antiseptic, anti-scale and gas-lift integral completion pipe string | |
| CN101624904A (en) | Open hole completion well sand resistant pipe string of sidetracking branch well and inserting type acid cleaning filling inner pipe string thereof | |
| CN101975041B (en) | Well cementing method for avoiding coal bed and device thereof | |
| CN204357385U (en) | Can unlocking hydraulic pressure formula sleeve pipe anchoring device | |
| CN105114029A (en) | Water plugging method for poor sealing borehole in mine laneway | |
| CN111155929A (en) | Coal mine underground water hole prevention and control high-water-pressure water jacking directional drilling tool and drilling method | |
| CN216043655U (en) | Reverse gravel throwing device | |
| CN108643827B (en) | A kind of hole structure construction method increasing ground-dipping uranium extraction pumping liquid measure | |
| CN111395995B (en) | Secondary well completion method for aquifer energy storage well | |
| CN105274994B (en) | Anti-suck sludge proof grouting process and grouting device in deep saturated sand | |
| CN216110656U (en) | Gravel reverse feeding device for filter arranged in ground leaching production well | |
| CN104074184B (en) | Pile base post-grouted expanded-base bored pile | |
| CN206830131U (en) | A kind of water injection well sand setting constant pressure check valve | |
| CN205297410U (en) | Well -flushing valve | |
| CN105804690B (en) | In-situ leaching process drilling inverse water mud device | |
| CN209556980U (en) | Coal measure gas prospect pit naked eye device for plugging | |
| CN113914831A (en) | Reverse gravel throwing device and method | |
| CN111764959A (en) | Gas-liquid linkage high-concentration slurry grouting device and method for deep water-rich goaf | |
| CN105089554B (en) | Oilfield horizontal well drag fracturing transformation service valve with pressure and anti-flushing well releasing method | |
| CN203891785U (en) | Special joint pipe assembly for throwing of gravels in pipe of hydrogeological water well | |
| CN101153491A (en) | Borehole wall-protection back cover and method for manufacturing large diameter hollow concrete pile | |
| CN207406342U (en) | A kind of filling system for the post processing of caisson wall wall | |
| CN207111019U (en) | Combined type junk mill for different hole diameters | |
| CN202788746U (en) | Drilling tool device for drilling, grouting and wall protection | |
| CN202718655U (en) | Accurate quantification injection seal-examination integrated tubular column |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |