CN117703494B - Rotary control head for coal bed gas exploitation and sealing of well bottom gas - Google Patents
Rotary control head for coal bed gas exploitation and sealing of well bottom gas Download PDFInfo
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- CN117703494B CN117703494B CN202410028196.9A CN202410028196A CN117703494B CN 117703494 B CN117703494 B CN 117703494B CN 202410028196 A CN202410028196 A CN 202410028196A CN 117703494 B CN117703494 B CN 117703494B
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- control head
- coal bed
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- 239000003245 coal Substances 0.000 title claims abstract description 35
- 238000007789 sealing Methods 0.000 title claims abstract description 23
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 56
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 6
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 6
- 241001330002 Bambuseae Species 0.000 claims abstract description 6
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 6
- 239000011425 bamboo Substances 0.000 claims abstract description 6
- 238000003860 storage Methods 0.000 claims description 46
- 239000004047 hole gas Substances 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 26
- 239000012535 impurity Substances 0.000 abstract description 23
- 238000005553 drilling Methods 0.000 abstract description 9
- 239000000203 mixture Substances 0.000 abstract description 5
- 230000002265 prevention Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a rotary control head for coal bed gas exploitation and sealing of well bottom gas, and relates to the field of underground drilling blowout prevention devices. The utility model provides a rotatory control head of closed shaft bottom gas is seted up to coalbed methane, includes the casing, be provided with a support section of thick bamboo and trapezoidal seat in the casing, be provided with the rubber core between a support section of thick bamboo and the trapezoidal seat, still include: the plurality of groups of air openings are all arranged on the supporting cylinder; the piston piece is sleeved on the supporting cylinder and is connected to the supporting cylinder in a sliding manner, and the piston piece is used for extruding the rubber core; the inflatable air bag is fixedly connected in the rubber core, and a plurality of groups of connecting pipes are connected to the inflatable air bag; according to the invention, gas generated during blowout enters the inflatable air bag to clean the surface of the drill rod, so that the influence of impurities on the tightness is avoided, meanwhile, the inflatable air bag is filled with the gas, so that the tightness between the drill rod and the rubber core is improved, the possibility that the casing ejects underground gas or gas-liquid mixture is effectively reduced, the safety is improved, and the drill rod is convenient to use.
Description
Technical Field
The invention belongs to the technical field of underground drilling blowout prevention devices, and particularly relates to a rotary control head for coal bed methane exploitation and sealing of well bottom gas.
Background
When coal bed gas is mined, a drilling machine is required to be used for continuously penetrating into the underground until entering a coal gas layer, and at the moment, gas can be discharged through a drilling hole, so that a user can collect the gas, and the gas is convenient to use as energy or industrial raw materials.
When the well is mined, blowout is easy to occur due to incorrect mining mode or poor underground pressure balance, and in order to avoid a large amount of leakage, a rotary control head, namely an annular blowout preventer is needed to plug a wellhead, and well killing and pressure relief are carried out subsequently.
Traditional rotary control head adopts the cooperation of piston and rubber core to wrap up the drilling rod, avoids leaking of gaseous in the pit, but when using, the drilling rod surface is stained with easily and attaches the spun impurity in the pit, and the impurity of this moment can influence the compactness of laminating, when the filter core wraps up the drilling rod, has some less gaps easily, and then influences the leakproofness, exists certain not enoughly.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a downhole drilling blowout preventer which overcomes or at least partially solves the above problems.
In order to solve the technical problems, the invention adopts the basic conception of the technical scheme that: the utility model provides a rotatory control head of closed shaft bottom gas is seted up to coalbed methane, includes the casing, be provided with a support section of thick bamboo and trapezoidal seat in the casing, be provided with the rubber core between a support section of thick bamboo and the trapezoidal seat, still include:
The plurality of groups of air openings are all arranged on the supporting cylinder;
the piston piece is sleeved on the supporting cylinder and is connected to the supporting cylinder in a sliding manner, and the piston piece is used for extruding the rubber core;
The inflatable air bag is fixedly connected in the rubber core, a plurality of groups of connecting pipes are connected to the inflatable air bag, and the air inlet ends of the connecting pipes are positioned in a cavity between the supporting cylinder and the shell;
the air outlet ends of the air outlet ports face to the center of the shell;
the boss is fixedly connected to the inflatable air bag and is positioned at one end of the inflatable air bag, which is close to the supporting cylinder;
And the return spring is connected in the shell, and the other end of the return spring is connected with the piston piece.
In order to facilitate temporary storage of redundant gas, further, a plurality of groups of gas storage shells are fixedly connected to the shell, a piston rod is connected to the gas storage shells in a sliding mode, one end of the piston rod penetrates through the gas storage shells, a spring piece is connected to the gas storage shells in an connecting mode, the other end of the spring piece is connected with the piston rod, and the connecting pipe is communicated with the gas storage shells.
In order to facilitate the circulation of gas, further, the gas storage shell is connected with a gas pipe, the gas inlet end of the gas pipe is positioned in a cavity between the supporting cylinder and the shell, the gas outlet end of the gas pipe is connected with a connecting pipe, and a one-way gas inlet valve is arranged in the gas pipe.
In order to be convenient for play the effect of suggestion, still further, be provided with the gas pocket on the one end that the gas storage shell kept away from the casing, be provided with the whistle in the gas pocket.
In order to prompt the falling of impurities on the inflatable airbag while the knocking is performed, a knocking rod is fixedly connected to the penetrating end of the piston rod, and the other end of the knocking rod abuts against the outer portion of the shell.
In order to facilitate the movement of the piston member, further, a convex ring is fixedly connected to the bottom of the piston member, and the convex ring is attached to the supporting cylinder.
In order to be convenient for shelter from tracheal inlet end, avoid the entering of excessive gas to lead to the damage of gas storage shell, still further, piston spare bottom is connected with and shelters from the ring, shelter from ring and shells inner wall and paste mutually, the interval sets up between piston spare and the shielding ring, tracheal inlet end is located between piston spare and the shielding ring.
In order to avoid the entry of impurities, a filter screen is further connected to the air inlet end of the air pipe.
In order to further facilitate the installation of the shielding ring, a plurality of groups of connecting rods are fixedly connected to the shielding ring, and the other ends of the connecting rods are fixedly connected with the piston piece.
In order to facilitate stable air outlet when the rubber core moves, the connecting pipe is a telescopic hose.
After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects: according to the invention, gas generated during blowout enters the inflatable air bag to clean the surface of the drill rod, so that the influence of impurities on the tightness is avoided, meanwhile, the inflatable air bag is filled with the gas, so that the tightness between the drill rod and the rubber core is improved, the possibility that the casing ejects underground gas or gas-liquid mixture is effectively reduced, the safety is improved, and the drill rod is convenient to use.
Drawings
In the drawings:
FIG. 1 is a schematic diagram of a rotary control head for coal bed methane mining and sealing bottom hole gas;
FIG. 2 is a schematic diagram of a rotary control head for coal bed methane exploitation and sealing of well bottom gas according to the present invention;
FIG. 3 is a schematic diagram of the structure of the portion A in FIG. 2 of a rotary control head for coal bed methane production and sealing of bottom hole gas;
FIG. 4 is a schematic diagram of the structure of the portion B in FIG. 2 of a rotary control head for coal bed methane production and sealing of bottom hole gas;
FIG. 5 is a schematic diagram of the structure of the portion C in FIG. 2 of a rotary control head for coal bed methane production and sealing of bottom hole gas;
FIG. 6 is a schematic diagram of the structure of the D part in FIG. 2 of a rotary control head for coal bed methane production and sealing of bottom hole gas;
FIG. 7 is a schematic diagram of the structure of the E part in FIG. 2 of a rotary control head for coal bed methane production and sealing of bottom hole gas;
fig. 8 is a schematic diagram of a structure of a piston member of a rotary control head for coal bed methane exploitation and sealing of well bottom gas after movement.
In the figure: 1. a housing; 101. a support cylinder; 1011. an air port; 102. a trapezoid seat; 103. a rubber core; 104. a piston member; 1041. a convex ring; 1042. a return spring; 105. a shielding ring; 1051. a connecting rod; 2. an inflatable airbag; 201. a boss; 202. an air vent; 203. a connecting pipe; 301. a gas storage case; 302. a piston rod; 303. a spring member; 304. an air pipe; 3041. a filter screen; 305. air holes; 306. the rod is knocked.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
Example 1: referring to fig. 1, fig. 2, fig. 3, fig. 5, fig. 8, a rotary control head for coalbed methane exploitation and sealing bottom hole gas includes a casing 1, a supporting cylinder 101 and a trapezoid seat 102 are arranged in the casing 1, a rubber core 103 is arranged between the supporting cylinder 101 and the trapezoid seat 102, and the rotary control head further includes: a plurality of groups of air ports 1011 are all arranged on the supporting cylinder 101; the piston piece 104 is sleeved on the supporting cylinder 101 and is connected to the supporting cylinder 101 in a sliding manner, and the piston piece 104 is used for extruding the rubber core 103; the inflatable air bag 2 is fixedly connected in the rubber core 103, a plurality of groups of connecting pipes 203 are connected to the inflatable air bag 2, and the air inlet end of each connecting pipe 203 is positioned in a cavity between the supporting cylinder 101 and the shell 1; a plurality of groups of air release ports 202 are arranged on the inflatable airbag 2, and the air outlet ends of the air release ports 202 face the center of the shell 1; the boss 201 is fixedly connected to the inflatable airbag 2, the boss 201 is positioned at one end of the inflatable airbag 2 close to the supporting cylinder 101, as shown in the figure, the boss 201 protrudes out of the inflatable airbag 2, and the boss 201 can be closely attached to the drill rod; a return spring 1042 connected in the housing 1, the other end of the return spring 1042 being connected to the piston member 104.
The coal bed is filled with a combustible gas, namely coal bed gas, commonly called as gas, and the exploitation mechanism and exploitation mode of the coal bed gas are different from those of a conventional gas reservoir, so that a cutting crack system in the coal bed is occupied by water, the coal bed gas is exploited firstly, and after the pressure is reduced below the critical desorption pressure, the coal bed gas is diffused into cracks from a matrix and micropores, and flows into a shaft along the cutting crack system to be exploited.
When the device is used, the shell 1 is hoisted on a wellhead, after the shell 1 is hoisted, the drill rod of the drill floor is aligned to the middle hollow hole of the shell 1, the lower part of the drill rod is connected with the guide cone with corresponding size, lubricant (such as butter or lead oil) is coated on the guide cone and the hollow hole, then the drill rod is pressed down, inserted into the hollow hole, the guide cone is removed after the insertion, then the drill rod is connected with the lower drilling tool on the wellhead, after the connection is completed, the flange plate at the bottom of the shell 1 is abutted with the flange plate on the wellhead, the connection is performed through bolts, after the connection is completed, whether all blowout preventers, well killing and choke manifold are connected is checked, and coal seam exploitation can be performed.
During exploitation, the condition that the underground pressure is not kept intact and blowout occurs during exploitation, at this time, the underground pressure is rapidly changed, and then airflow and liquid with pressure are generated, because under the condition of the same pressure, the flow rate of gas is faster than that of liquid, at this time, the gas at the bottom of the well can rapidly move to the ground through a gap formed by a drill rod, the gas can be gas or can be mixed gas containing gas, the gas can enter into a cavity between the shell 1 and the supporting cylinder 101 through the air hole 1011 along with the entering of the gas with pressure, then the piston member 104 moves upwards under the change of the air pressure, and then the rubber core 103 is extruded, so that the rubber core 103 is gradually extruded and deformed, the gas can enter into the inflatable air bag 2 through the connecting pipe 203 under the action of the air pressure before the piston member 104 moves, since the air-discharging port 202 is arranged on the air-charging bag 2, and the boss 201 is tightly attached to the drill rod, as shown in fig. 3, a certain gap exists between the air-charging bag 2 and the drill rod, at this time, the air-charging bag 2 is slightly expanded under the action of the air, the air in the subsequent part is rapidly discharged through the air-discharging port 202, and then some impurities possibly existing on the surface of the drill rod are blown off (when the impurities are mostly drilled, the air flow and the liquid are relatively small in pressure and volume and are indirectly discharged through the underground air flow or the liquid, and are discharged through the gap between the drill rod and the shell, which is a normal phenomenon, not the blowout phenomenon, at this time, some impurities remain on the surface of the drill rod), and due to the occurrence of the boss 201 and the blowout phenomenon, the blown air flow moves upwards, the impurities are then discharged upwards through the gap between the shell 1 and the drill rod (at this time, the impurities are blown out to effectively enable the inflatable bag 2 to be attached to the drill rod, so that the tightness is improved, meanwhile, the possibility that some harder impurities damage the inflatable bag 2 or the rubber core 103 is reduced, the tightness is convenient for the next blowout phenomenon in use, and the long-term use is convenient), the piston member 104 is moved along with the increase of air pressure, at this time, the rubber core 103 is continuously extruded by the extrusion of the piston member 104, so that the inflatable bag 2 is attached to the drill rod, the air leakage port 202 is attached to the drill rod, gas cannot be discharged, the rubber core 103 can drive the inflatable bag 2 to tightly wrap the drill rod (at this time, the inflatable bag 2 and the rubber core 103 can deform under the action of extrusion, the inflatable bag 2 is particularly obvious, and part of gas can return into the shell 1 through the connecting pipe 203, and the rest of the gas is under the state with certain pressure, so that the pressure in the shell 1 is consistent), and the possibility that the blowout is caused by gas leakage is reduced.
After the gas in the blowout has flowed out, there is liquid or a mixture of gas and liquid into the housing 1, but at this point the housing 1 has completed the shutoff, at which point the liquid and gas will not be vented.
When the drill rod is sealed through the rubber core 103 and the inflatable air bag 2, blowout phenomenon at the position of the casing 1 can be avoided, but blowout phenomenon is prevented from continuously occurring, well killing is needed, the well killing is a technical measure for overcoming underground formation pressure by utilizing liquid column pressure formed by the mass of mud, the aim is to control underground formation oil gas pressure and prevent formation fluid from entering a borehole, a mud pump, a high-pressure manifold and heavy mud are needed under the special conditions of equipment conventionally, a high-pressure cement truck, a high-pressure manifold and heavy mud are needed, auxiliary facilities are needed, and the blown out gas or liquid can be discharged when necessary, so that well killing is convenient.
In part, the situation that the gas is less and the liquid is directly generated may occur, at this time, the liquid enters the inflatable air bag 2 and lifts up the piston member 104, and the sealing effect is also achieved, but at this time, the cleaning effect is good without the gas, because some and fine particle impurities are carried in the liquid, and the larger impurities cannot enter the shell 1 because the gap between the drill hole and the drill rod is smaller.
Example 2: referring to fig. 1,2,3, 5 and 6, a rotary control head for coal bed methane production and sealing of downhole gas is basically the same as embodiment 1, and further comprises: the gas storage device comprises a gas storage shell 301, a plurality of groups of gas storage shells 301 are fixedly connected to a shell 1, a piston rod 302 is connected to the gas storage shell 301 in a sliding mode, one end of the piston rod 302 penetrates through the gas storage shell 301, a spring piece 303 is connected to the gas storage shell 301, the other end of the spring piece 303 is connected with the piston rod 302, a connecting pipe 203 is communicated with the gas storage shell 301, a gas pipe 304 is connected to the gas storage shell 301, the gas inlet end of the gas pipe 304 is located in a cavity between a supporting cylinder 101 and the shell 1, the gas outlet end of the gas pipe 304 is connected with the connecting pipe 203, the connecting pipe 203 is a telescopic hose, a one-way gas inlet valve is arranged in the gas pipe 304, and the one-way gas inlet valve is located in a section of the gas pipe 304 which enters the gas storage shell 301 from the shell 1.
Through the arrangement of the gas storage shell 301, when in use, the bottom hole gas flow enters the gas storage shell 301 through the gas pipe 304, then part of the gas flow enters the connecting pipe 203 through the gas outlet end of the gas pipe 304 and finally enters the gas storage shell 2, then the surface of the drill rod is cleaned, and the rest part of the gas is accumulated in the gas storage shell 301, then the gas pressure in the gas storage shell 301 is increased, the piston rod 302 is moved, then part of the gas is stored, and meanwhile, the rubber core 103 is extruded along with the movement of the piston piece 104, the rubber core 103 and the gas storage shell 2 wrap the drill rod, finally the gas cannot be discharged through the gas storage shell 2, and due to the arrangement of the one-way valve, the gas enters the gas storage shell 301 at the moment, after the follow-up blowout phenomenon is finished, the pressure in the shell 1 is gradually reduced (under the action of a throttle manifold, the redundant gas and the liquid are discharged, the pressure is gradually reduced), at this time, the piston member 104 is reset under the action of the reset spring 1042, so that the inflatable airbag 2 and the rubber core 103 are reset, at this time, the rubber core 103 is far away from the inflatable airbag 2, the air release port 202 on the inflatable airbag 2 can continuously spray air, at this time, the air in the air storage shell 301 is gradually discharged under the action of the spring member 303 and finally discharged through the air release port 202, at this time, the sprayed air can clean the surface of the drill rod at the inflatable airbag 2 (at this time, impurities possibly follow the air flow and the liquid enter the casing 1 during blowout and finally adhere to the inflatable airbag 2 and the drill rod, especially the impurities at the boss 201, as shown in fig. 3, smooth round corners are arranged on the boss 201, at this time, at the time of discharging the air in the subsequent air storage shell 301, the impurities on the boss 201 fall to the lower part of the casing 1, or is discharged from the top of the shell 1 under the action of air flow), impurities are discharged from the upper part of the shell 1, so that the rotation of the drill rod is facilitated, and the rotation of the drill rod is prevented from damaging the inflatable air bag 2 and the rubber core 103.
The gas storage shell 301 is arranged, certain gas can be stored in the daily interior, when blowout occurs later, the gas in the gas storage shell can enter the inflatable airbag 2 preferentially, liquid is temporarily stored in the gas storage shell 301 until most of the gas in the gas storage shell 301 is removed, the piston rod 302 can move under the action of pressure, the space is increased, the liquid is stored continuously, and the possibility that the liquid enters the inflatable airbag 2 is reduced.
During daily use, a user can manually pull the piston rod 302, then the gas in the shell 1 is stored through the gas storage shell 301, and then the stored gas enters the inflatable air bag 2 through the connecting pipe 203 under the action of the spring piece 303 and is discharged through the gas discharge port 202, so that the vicinity of the drill rod is cleaned.
Example 3: referring to fig. 7, a rotary control head for coal bed methane production and bottom hole gas sealing is basically the same as in example 2, and further: an air hole 305 is arranged at one end of the air storage shell 301 far away from the shell 1, and an air whistle is arranged in the air hole 305, and is an object with sharp sound along with the rapid flow of air, namely the whistle.
At this time, as shown in fig. 7, when blowout occurs, the rapid movement of the piston rod 302 will make the gas inside the gas storage shell 301 (away from the other part of the chamber of the spring member 303) be discharged through the air hole 305, and then a sharp sound is generated through the whistle, so as to play a role in warning, informing nearby staff that blowout occurs, and pressure relief and well killing are required.
Example 4: referring to fig. 1,2 and 7, a rotary control head for coal bed methane production and bottom hole gas sealing is basically the same as in embodiment 3, and further comprises: a knocking rod 306 is fixedly connected to the penetrating end of the piston rod 302, and the other end of the knocking rod 306 abuts against the outside of the shell 1.
After the blowout phenomenon is finished, gas inside the piston rod 302 enters the inflatable airbag 2, at the moment, the piston rod 302 is reset, meanwhile, the knocking rod 306 contacts the outside of the shell 1, the knocking rod 306 is propped against the outside of the shell 1 in an initial state, when the shell 1 is moved away from the initial state and is close to the shell 1 under the action of the spring member 303, a certain knocking is generated, and at the moment, the vibration generated by the knocking can promote loosening or falling of impurities on the inflatable airbag 2, the drill rod and the supporting cylinder 101.
Example 5: referring to fig. 4, a rotary control head for coal bed methane production and bottom hole gas sealing is basically the same as in example 3, and further: the bottom of the piston member 104 is fixedly connected with a convex ring 1041, and the convex ring 1041 is attached to the supporting cylinder 101.
By the arrangement of the convex ring 1041, the tightness can be effectively increased, and the movement of the piston member 104 is facilitated.
Example 6: referring to fig. 5, a rotary control head for coal bed methane production and bottom hole gas sealing is basically the same as in example 3, and further: a screen 3041 is connected to the air inlet end of the air pipe 304.
Through the setting of filter screen 3041, can effectually reduce the entering of external impurity, filter the impurity in gas or the liquid, avoid the entering of impurity to influence the use of inflatable balloon 2.
Example 7: referring to fig. 2, 5 and 8, a rotary control head for coal bed methane production and bottom hole gas sealing is basically the same as in embodiment 3, and further comprises: the bottom of the piston piece 104 is connected with a shielding ring 105, the shielding ring 105 is attached to the inner wall of the shell 1, the piston piece 104 and the shielding ring 105 are arranged at intervals, the air inlet end of the air pipe 304 is positioned between the piston piece 104 and the shielding ring 105, a plurality of groups of connecting rods 1051 are fixedly connected to the shielding ring 105, and the other ends of the connecting rods 1051 are fixedly connected with the piston piece 104.
Through setting up of the shielding ring 105, initial state is as shown in fig. 2, the air inlet end of air pipe 304 is located between piston spare 104 and shielding ring 105 this moment, along with the emergence of blowout phenomenon, gas will get into the cavity between casing 1 and the supporting cylinder 101, gas will get into in the air pipe 304 simultaneously, remaining gas will impel piston spare 104 to upwards remove, follow-up state is as shown in fig. 8 this moment, piston spare 104 moves in place, carry out complete parcel to rubber core 103, improve the leakproofness, shielding ring 105 will shelter from the air inlet of air pipe 304 simultaneously, avoid the gas to get into a large amount and lead to the damage of gas storage shell 301, also can avoid the entering of follow-up gas-liquid mixture or liquid to get into a large amount, avoid the entering of liquid to influence the use of inflatable bag 2, the filter screen 3041 on the air pipe 304 will be cleaned simultaneously to the removal of shielding ring 105, avoid a large amount of debris to pile up and influence the entering of gas, follow-up blowout finishes, convenient for follow-up use.
Meanwhile, the setting of the shielding ring 105 can enable the gas to enter the inflatable airbag 2 at the beginning, as shown in the figure, the air pipe 304 has a certain length, the air storage shell 301 has a certain space under the action of the spring piece 303, and can store a certain gas in an initial state, so that after the subsequent liquid enters the air pipe 304, the gas pipe 304 and the air storage shell 301 can be reserved, the inflatable airbag 2 is filled with the gas only, the surface of a drill rod is cleaned, at the moment, the one-way valve can be set as an electromagnetic one-way valve, a control valve is arranged at the top of the air pipe 304, a bending part at the top of the shell 1 in the figure can open the electromagnetic one-way valve through remotely controlling the opening and closing of the one-way valve, and after the blowout phenomenon is finished, the control valve is closed, so that the liquid flows back into the shell 1 but does not enter the inflatable airbag 2.
According to the invention, gas generated during blowout enters the inflatable air bag 2 to clean the surface of the drill rod, so that the influence of impurities on the tightness is avoided, meanwhile, the inflatable air bag 2 is filled with the gas, so that the tightness between the drill rod and the rubber core 103 is improved, the possibility that the casing 1 ejects underground gas or gas-liquid mixture is effectively reduced, the safety is improved, and the use is convenient.
The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any and all simple modifications, equivalent variations and adaptations of the embodiments described above, which are within the scope of the invention, may be made by those skilled in the art without departing from the scope of the invention.
Claims (10)
1. The utility model provides a rotatory control head of closed shaft bottom gas is seted up to coalbed methane, includes casing (1), be provided with in casing (1) and support section of thick bamboo (101) and trapezoidal seat (102), be provided with between support section of thick bamboo (101) and trapezoidal seat (102) and glue core (103), its characterized in that still includes:
a plurality of groups of air openings (1011) are arranged on the supporting cylinder (101);
the piston piece (104) is sleeved on the supporting cylinder (101) and is connected to the supporting cylinder (101) in a sliding manner, and the piston piece (104) is used for extruding the rubber core (103);
the inflatable air bag (2) is fixedly connected in the rubber core (103), a plurality of groups of connecting pipes (203) are connected to the inflatable air bag (2), and the air inlet end of each connecting pipe (203) is positioned in a cavity between the supporting cylinder (101) and the shell (1);
the plurality of groups of air leakage ports (202) are arranged on the inflatable air bag (2), and the air outlet ends of the air leakage ports (202) face the center of the shell (1);
The boss (201) is fixedly connected to the inflatable air bag (2), and the boss (201) is positioned at one end of the inflatable air bag (2) close to the supporting cylinder (101);
and the return spring (1042) is connected in the shell (1), and the other end of the return spring (1042) is connected with the piston member (104).
2. The rotary control head for coal bed methane exploitation and sealing bottom hole gas according to claim 1, wherein a plurality of groups of gas storage shells (301) are fixedly connected to the shell (1), a piston rod (302) is slidably connected to the gas storage shells (301), one end of the piston rod (302) penetrates through the gas storage shells (301), a spring piece (303) is connected to the gas storage shells (301), the other end of the spring piece (303) is connected with the piston rod (302), and the connecting pipe (203) is communicated with the gas storage shells (301).
3. The rotary control head for coal bed methane exploitation and closed well bottom gas according to claim 2, wherein the gas storage shell (301) is connected with a gas pipe (304), the gas inlet end of the gas pipe (304) is located in a cavity between the supporting cylinder (101) and the shell (1), the gas outlet end of the gas pipe (304) is connected with the connecting pipe (203), and a unidirectional gas inlet valve is arranged in the gas pipe (304).
4. The rotary control head for coal bed methane exploitation and closed bottom hole gas according to claim 2, wherein an air hole (305) is arranged at one end of the air storage shell (301) away from the shell (1), and a whistle is arranged in the air hole (305).
5. The rotary control head for coal bed methane exploitation and closed well bottom gas according to claim 2, wherein a knocking rod (306) is fixedly connected to the penetrating end of the piston rod (302), and the other end of the knocking rod (306) is propped against the outside of the shell (1).
6. The rotary control head for coal bed methane exploitation and closed bottom hole gas according to claim 1, wherein a convex ring (1041) is fixedly connected to the bottom of the piston member (104), and the convex ring (1041) is attached to the supporting cylinder (101).
7. A rotary control head for coal bed methane exploitation and sealing of well bottom gas according to claim 3, wherein the bottom of the piston member (104) is connected with a shielding ring (105), the shielding ring (105) is attached to the inner wall of the shell (1), the piston member (104) and the shielding ring (105) are arranged at intervals, and the air inlet end of the air pipe (304) is located between the piston member (104) and the shielding ring (105).
8. A rotary control head for coal bed methane production closed bottom hole gas according to claim 3, wherein a filter screen (3041) is connected in the air inlet end of the air pipe (304).
9. The rotary control head for coal bed methane exploitation and sealing of well bottom gas according to claim 7, wherein a plurality of groups of connecting rods (1051) are fixedly connected to the shielding ring (105), and the other ends of the connecting rods (1051) are fixedly connected with the piston member (104).
10. The rotary control head for coal bed methane production closed bottom hole gas according to claim 1, wherein the connecting pipe (203) is a telescopic hose.
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| CN202410028196.9A CN117703494B (en) | 2024-01-08 | 2024-01-08 | Rotary control head for coal bed gas exploitation and sealing of well bottom gas |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355194A (en) * | 2017-08-30 | 2017-11-17 | 中联煤层气有限责任公司 | A kind of annular preventer |
| CN108825164A (en) * | 2018-08-27 | 2018-11-16 | 陈芳芳 | The blowout hookup of oil well being easily installed |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201218077Y (en) * | 2008-07-08 | 2009-04-08 | 中国石油天然气股份有限公司 | Air bag type self-sealing well sealer |
| US8844617B1 (en) * | 2013-02-18 | 2014-09-30 | Dwight Baker | Annular blowout container (ABOC) |
| CN117108237A (en) * | 2023-09-11 | 2023-11-24 | 西南石油大学 | Underground three-way integrated blowout preventer |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107355194A (en) * | 2017-08-30 | 2017-11-17 | 中联煤层气有限责任公司 | A kind of annular preventer |
| CN108825164A (en) * | 2018-08-27 | 2018-11-16 | 陈芳芳 | The blowout hookup of oil well being easily installed |
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