CN108343405B - Underground throttle with secondary throttle function - Google Patents
Underground throttle with secondary throttle function Download PDFInfo
- Publication number
- CN108343405B CN108343405B CN201810360445.9A CN201810360445A CN108343405B CN 108343405 B CN108343405 B CN 108343405B CN 201810360445 A CN201810360445 A CN 201810360445A CN 108343405 B CN108343405 B CN 108343405B
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- sealing
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- assembly
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- 238000007789 sealing Methods 0.000 claims abstract description 125
- 210000000078 claw Anatomy 0.000 claims description 17
- 238000001125 extrusion Methods 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 238000010008 shearing Methods 0.000 claims description 8
- 238000012856 packing Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 94
- 239000003345 natural gas Substances 0.000 abstract description 47
- 238000005553 drilling Methods 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 17
- 230000008569 process Effects 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 239000002343 natural gas well Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004001 molecular interaction Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Abstract
The invention relates to an underground throttle with a secondary throttle function, belonging to the technical field of drilling tools for petroleum and natural gas exploitation. The underground throttle consists of an upper joint, a lower joint, a central pipe, slips, slip cones, a secondary throttle air tap, a primary throttle air tap and a sealing rubber cylinder: the upper end of the secondary throttling air tap is connected with an upper main body pipe through threads; the upper end of the upper main body pipe is provided with an upper joint through a central pipe thread; the lower end of the secondary throttling air tap is connected with a connecting sleeve through an air tap connector by screw threads; the lower end of the connecting sleeve is connected with a primary throttling air tap in a threaded manner; the lower end of the primary throttling air tap is connected with a lower main body pipe through a connecting inner pipe thread; the lower end of the lower main body pipe is connected with a lower joint through screw threads. The underground throttle device is simple in structure and convenient to use, solves the problems that the existing throttle device can only throttle once and the throttle area is not adjustable, and meets the use requirement of people.
Description
Technical Field
The invention relates to an underground throttle with a secondary throttle function, and belongs to the technical field of drilling tools for natural gas exploitation.
Background
In the field of natural gas exploitation, especially in the exploitation process of a high-temperature high-pressure natural gas well, people often use a restrictor to cool down and reduce pressure of natural gas, so that the gas well can be effectively and stably produced. The existing downhole throttler has the problem that the single throttling can be performed only because of the limitation of structural reasons; in order to meet the production requirement in the production process, a plurality of underground throttlers are often required to be used in series, and the problem of high use cost exists; in addition, the throttle area of the existing throttle is not adjustable, and in order to achieve the purpose of enabling the gas well to achieve maximum gas production, the throttle is required to be salvaged and replaced with different types frequently, so that the throttle area is matched with the well pressure of the gas well, and further the problems of complex operation and high production cost exist. There is therefore a need to develop a choke that addresses the above problems with existing downhole throttles.
Disclosure of Invention
The invention aims at: the underground throttle with the secondary throttle function is simple in structure and convenient to use, and solves the problems that the existing throttle can only be used for single throttle and the throttle area cannot be adjusted.
The technical scheme of the invention is as follows:
the utility model provides a downhole choke with secondary throttle function, it comprises upper joint, lower clutch, center tube, slips cone, secondary throttle air cock, primary throttle air cock and sealing rubber barrel, its characterized in that: the upper end of the secondary throttling air tap is connected with an upper main body pipe through threads; the upper end of the upper main body pipe is provided with an upper joint through a central pipe thread; the central pipe is sleeved with a slip, and a slip cone is arranged on the upper main pipe below the slip through a deblocking pin A; the lower end of the slip cone is provided with a limit lantern ring A through a pin; an unsealing spring A is arranged between the limiting collar A and the upper main body pipe; the lower end of the secondary throttling air tap is connected with a connecting sleeve through an air tap connector by screw threads; the lower end of the connecting sleeve is connected with a primary throttling air tap in a threaded manner; the air tap joint is internally provided with a sealing sleeve through a shearing pin, and a compression spring is arranged between the sealing sleeve and the primary throttling air tap; the lower end of the primary throttling air tap is connected with a lower main body pipe through a connecting inner pipe thread; the lower end of the lower main body pipe is connected with a lower joint through screw threads; the lower main body pipe is provided with a sealing rubber cylinder; a release sleeve is arranged on the connecting inner pipe above the sealing rubber cylinder through a deblocking pin B; one end of the release sleeve is provided with a limit sleeve ring B through a pin; an unsealing spring B is arranged between the limiting lantern ring B and the connecting inner pipe; the lower main body pipe below the sealing rubber cylinder is provided with an extrusion sleeve in a sliding manner through a sealing flange arranged on the circumferential surface; the upper end of the extrusion sleeve is provided with a sealing ring through a pin; the lower main body pipe and the lower joint below the sealing ring are provided with pressing holes; a baffle ring B is arranged between the lower end of the extrusion sleeve and the lower joint.
The outer surface of the central tube is of a stepped shaft type, and a thrust flange is arranged at the end head of the lower end of the central tube.
The slips are composed of clamping claws and an assembly barrel; the lower end of the assembly cylinder is uniformly provided with a plurality of clamping claws through a rotary pin; the outer surface of each claw is provided with a latch; the inner surface of each claw is provided with a backstop groove; the retaining groove is in a hook shape; the retaining groove is in interval abutting connection with the end face of the thrust flange.
The periphery of the upper main body pipe is provided with an assembling flange; the assembly flange is connected with the slip cone through a deblocking pin A; an unsealing spring A is arranged between the assembly flange and the limit collar.
The secondary throttling air tap consists of an assembly shell, a sealing piston, a circulation cylinder, a sealing cover, an assembly shaft and an adjusting spring A; the upper end of the assembly shell is in threaded connection with the upper main body pipe; the lower end of the assembly shell is in threaded connection with the air tap joint; the assembly shell is fixedly provided with a circulation cylinder through an inner flange; an assembly shaft is fixedly arranged in the circulation cylinder through a sealing cover; the assembly shaft extends into the inner flange; the assembly shaft is provided with a sealing piston in a sliding manner; the sealing piston is in intermittent sealing connection with the inner flange; an adjusting spring A is arranged between the sealing piston and the sealing cover.
The circumference of the circulation cylinder is uniformly provided with a plurality of circulation long holes, and each circulation long hole is in sliding connection with the sealing piston.
The primary throttling air tap consists of an upper connecting cylinder, a lower connecting cylinder, a limit valve rod, a baffle ring A and an adjusting spring B; the upper end of the upper connecting cylinder is in threaded connection with the connecting sleeve; a baffle ring A is arranged between the upper connecting cylinder and the connecting sleeve; the lower end of the upper connecting cylinder is connected with a lower connecting cylinder through threads; a limit valve rod is slidably arranged in the upper connecting cylinder through an assembly cavity; an adjusting spring B is arranged between the limiting valve rod and the upper connecting cylinder.
The limit valve rod is of an integrated structure and consists of a valve seat, an assembly flange and a sealing pin; one end of the valve seat is provided with a sealing pin; one end of the sealing pin is conical; flow holes are uniformly distributed on valve seats around the sealing pin; the lower end circumferential surface of the valve seat is provided with an assembly flange; the assembly flange is in sliding connection with the assembly cavity of the upper connecting cylinder; the valve seat is in sliding connection with the inner hole of the upper connecting cylinder.
The outer surface of the sealing sleeve is stepped; the thick end part of the sealing sleeve is connected with the air tap joint through a shearing pin; a compression spring is arranged between the thick end part of the sealing sleeve and the upper connecting cylinder; the thin end part of the sealing sleeve is connected with the upper connecting cylinder in a sliding way; the thin end head of the sealing sleeve is in intermittent sealing connection with the flow hole of the limit valve rod.
The outer surface of the connecting inner pipe is provided with an assembling flange; the assembly flange is connected with the release sleeve through a release pin B; an unsealing spring B is arranged between the assembly flange and the limit collar B; the assembly flange is provided with a balance hole; the inner hole of the connecting inner tube is horn-shaped with the upper part wide and the lower part narrow, and the sealing pin is in intermittent sealing connection with the inner hole of the connecting inner tube.
The inner surface of the sealing ring is provided with one-way ratchets, and the circumferential surface of the lower main body tube is correspondingly provided with one-way tooth grooves; the sealing ring is meshed and connected with the lower main body pipe through a one-way ratchet.
The lower joint is in a barrel shape with a sealed lower end, and vent holes are uniformly distributed on the circumferential surface of the lower joint; each vent hole is internally provided with a sand-proof filter screen.
The invention has the advantages that:
this downhole choke ware with secondary throttle function, simple structure, convenient to use have adopted the structural design of once throttle air cock and secondary throttle air cock, after adopting this kind of design, this downhole choke ware not only can carry out twice throttle to the natural gas of downhole high temperature high pressure, and the throttle area of once throttle air cock and secondary throttle air cock can change along with the change of natural gas pressure moreover, makes its throttle area and natural gas pressure assorted all the time to solve the problem that can only singly throttle and throttle area is unadjustable that current choke ware exists, satisfied the needs that people used.
The attached drawings refer to the figures
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the central tube of the present invention;
FIG. 3 is a schematic illustration of a slip construction according to the present invention;
FIG. 4 is an enlarged schematic view of the structure shown at A in FIG. 1;
FIG. 5 is a schematic diagram of a secondary throttle valve according to the present invention;
FIG. 6 is a schematic view of the structure in the direction D-D in FIG. 5;
FIG. 7 is a schematic view of a primary throttle valve according to the present invention;
FIG. 8 is a schematic view of the structure in the E-E direction in FIG. 7;
FIG. 9 is a schematic view of a check valve stem of the present invention;
FIG. 10 is an enlarged schematic view of the structure at B in FIG. 1;
FIG. 11 is an enlarged schematic view of FIG. 1C;
FIG. 12 is a schematic view of a setting mechanism of the present invention;
FIG. 13 is an enlarged schematic view of the structure shown at F in FIG. 12;
FIG. 14 is an enlarged schematic view of the structure of FIG. 12G;
FIG. 15 is a schematic view of the normal operation structure of the present invention;
FIG. 16 is a schematic illustration of an unsealing structure according to the present invention;
FIG. 17 is an enlarged schematic view of the structure at H in FIG. 16;
fig. 18 is an enlarged schematic view of the structure at I in fig. 16.
In the figure: 1. an upper joint, 2, a lower joint, 3, a central tube, 4, slips, 5, a sand-proof filter screen, 6, a secondary throttle air tap, 7, a primary throttle air tap, 8 sealing rubber barrels, 9, an upper main body tube, 10, slip cones, 11, unsealing pins A,12, limit collars A,13, unsealing springs A,14, air tap joints, 15, connecting sleeves, 16, shearing pins, 17, sealing sleeves, 18, compression springs, 19, connecting inner tubes, 20, a lower main body tube, 21, unsealing pins B,22, release sleeves, 23, limit collars B,24, unsealing springs B,25, sealing flanges, 26, extrusion sleeves, 27, a sealing ring, 28, a punching hole, 29, a baffle ring B,30, a thrust flange, 31, a claw, 32, an assembly cylinder, 33, a rotating pin, 34, a retaining groove, 35, an assembly flange, 36, an assembly housing, 37, a sealing piston, 38, a circulation cylinder, 39, a sealing cover, 40, an assembly shaft, 41, an adjusting spring A,42, an inner flange, 43, a circulation long hole, 44, an upper connecting cylinder, 45, a lower connecting cylinder, 46, a limit valve rod, 47, a baffle ring A,48, an adjusting spring B,49, an assembly cavity, 50, a valve seat, 51, an assembly flange, 52, a sealing pin, 53, a circulation hole, 54 and a balance hole.
Detailed Description
The underground throttle with the secondary throttle function consists of an upper joint 1, a lower joint 2, a central pipe 3, slips 4, a slip cone 10, a secondary throttle air nozzle 6, a primary throttle air nozzle 7 and a sealing rubber cylinder 8.
The secondary throttle tap 6 is composed of an assembly housing 36, a sealing piston 37, a flow cylinder 38, a sealing cover 39, an assembly shaft 40 and an adjusting spring A41 (see fig. 5 of the specification); the flow-through cartridge 38 is secured within the assembly housing 36 by an inner flange 42; a plurality of long circulation holes 43 (see fig. 6 of the specification) are uniformly distributed on the circumferential surface of the circulation cylinder 38.
An assembly shaft 40 is fixedly arranged in the circulation cylinder 38 through a sealing cover 39; the mounting shaft 40 extends into the interior of the inner flange 42; the assembly shaft 40 is slidably provided with a sealing piston 37; an adjusting spring a41 is provided between the sealing piston 37 and the sealing cover 39. The seal piston 37 is slidably connected to each of the long flow holes 43 in the flow tube 38. The sealing piston 37 is in intermittent sealing connection with the inner flange 42.
During operation, natural gas impacts the sealing piston 37 in the process of moving from bottom to top, so that the sealing piston overcomes the elasticity of the adjusting spring A41 and then slides upwards along the assembly shaft 40; the greater the natural gas pressure during this process, the greater the distance the sealing piston 37 moves upward; the larger the flow area of the flow slot 43 below the sealing piston 37 is communicated with the inner flange 42, so that the secondary throttling air tap 6 can achieve the purpose of automatically adjusting the throttling area according to the natural gas pressure.
The upper end of the assembly shell 36 of the secondary throttle valve 6 is connected with an upper main body pipe 9 (see figure 1 of the specification) through threads; the upper end of the upper main body pipe 9 is provided with an upper joint 1 through a central pipe 3 in a threaded manner; the outer surface of the central tube 3 is in a stepped shaft shape, and the end head of the lower end of the central tube 3 is provided with a thrust flange 30 (see fig. 2 of the specification).
The central tube 3 is sleeved with a slip 4 (see figure 3 in the specification), and the slip 4 consists of a claw 31 and an assembling cylinder 32; the assembly cylinder 32 is sleeved on the central tube 3 in transition fit; the purpose of the fitting cylinder 32 and the central tube 3 being thus arranged is: so that when the downhole choke is suddenly stopped and lifted in the working process, the slips 4 can relatively move with the central pipe 3 under the influence of self gravity and inertia, thereby achieving the purpose of slip setting.
The lower end of the assembly cylinder 32 is uniformly provided with a plurality of claws 31 through a rotary pin 33; the outer surface of each claw 31 is provided with a latch; the inner surface of each claw 31 is provided with a retaining groove 34; the retaining groove 34 is in the shape of a hook; the retaining groove 34 is in abutting engagement with the end face of the retaining flange 30. In the working process, when the slip 4 moves downwards to finish setting, the retaining groove 34 of the slip is in abutting connection with the end face of the thrust flange 30, so that the slip 4 cannot move upwards; and each claw 31 has a certain distance with the radial direction of the thrust flange 30, so that the problem that the slip 4 is retreated to lose the setting force after setting can be avoided, and each claw 31 can be smoothly folded in the radial direction to be separated from contact with the shaft after losing the support, thereby ensuring the smooth completion of the deblocking.
The circumference of the upper main body pipe 9 is provided with an assembling flange 35; the upper body tube 9 below the slips 4 is fitted with a slip cone 10 by means of a fitting flange 35 and a deblocking pin a 11; the lower end of the slip cone 10 is provided with a limit lantern ring A12 through a pin; an unsealing spring a13 is arranged between the limit collar a12 and the assembly flange 35 of the upper main body pipe 9 (see fig. 4 of the specification). When the deblocking pin A11 is sheared, the deblocking spring A13 can push the slip cone 10 to move downwards under the action of self elastic force.
The lower end of an assembly shell 36 of the secondary throttling air tap 6 is connected with a connecting sleeve 15 through an air tap joint 14 in a threaded manner; the lower end of the connecting sleeve 15 is connected with a primary throttling air tap 7 in a threaded manner. The primary throttle tap 7 is composed of an upper connecting cylinder 44, a lower connecting cylinder 45, a limit valve rod 46, a retainer A47 and an adjusting spring B48 (see fig. 7 of the specification).
The upper end of the upper connecting cylinder 44 is in threaded connection with the connecting sleeve 15; a baffle ring A47 is arranged between the upper connecting cylinder 44 and the connecting sleeve 15; the lower end of the upper connecting cylinder 44 is screwed with a lower connecting cylinder 45.
The upper connecting cylinder 44 is internally provided with a limit valve rod 46 in a sliding way through an assembling cavity 49; the limit valve rod 46 is of an integral structure and consists of a valve seat 50, an assembly flange 51 and a sealing pin 52; one end of the valve seat 50 is provided with a sealing pin 52.
Flow holes 53 are uniformly distributed on the valve seat 50 around the sealing pin 52; the lower end circumferential surface of the valve seat 50 is provided with an assembly flange 51; the fitting flange 51 is slidably connected to the fitting cavity 49 of the upper connecting cylinder 44; the valve seat 50 is slidably coupled to the bore of the upper coupling barrel 44.
An adjusting spring B48 is arranged between the assembly flange 51 of the limit valve rod 46 and the upper connecting cylinder 44.
The air tap joint 14 is internally provided with a sealing sleeve 17 through a shearing pin 16, and the outer surface of the sealing sleeve 17 is stepped; the thick end part of the sealing sleeve 17 is connected with the air tap joint 14 through a shear pin 16; a compression spring 18 is arranged between the thick end part of the sealing sleeve 17 and the upper connecting cylinder 44; the thin end part of the sealing sleeve 17 is connected with the upper connecting cylinder 44 in a sliding way; the thin end of the sealing sleeve 17 is in intermittent sealing connection with the flow hole 53 of the limit valve rod 46. In operation, the end surface of the boot seal 17 seals the flow aperture 53 when in contact with the check valve stem 46.
The lower end of the lower connecting cylinder 45 of the primary throttle valve 7 is connected with a lower main body pipe 20 through a connecting inner pipe 19 in a threaded manner; the inner hole of the connecting inner tube 19 is horn-shaped (see fig. 10 of the specification), and the sealing pin 52 is in intermittent sealing connection with the inner hole of the connecting inner tube 19. One end of the sealing pin 52 is tapered. The purpose of the sealing pin 52 and the inner bore of the connecting inner tube 19 being arranged in this way is: firstly, when the sealing pin 52 is in sealing connection with the connecting inner pipe 19, the conical surface of the sealing pin 52 can be well attached to the inner hole of the connecting inner pipe 19, so that a good sealing effect is achieved. Secondly, when the natural gas pump works, natural gas impacts the sealing piston 37 in the process of moving from bottom to top, so that the natural gas overcomes the adjusting spring B48 and then slides upwards; the greater the natural gas pressure during this process, the greater the distance that the check valve stem 46 moves upward; the farther the distance between the conical surface of the sealing pin 52 and the inner hole of the connecting inner pipe 19 is, the larger the natural gas flow area is, the smaller the natural gas flow area is, and the purpose of automatically adjusting the throttling area according to the pressure of the natural gas can be achieved by the throttle valve 7 once.
The lower end of the lower main body pipe 20 is connected with a lower joint 2 through screw threads; the lower joint 2 is in a barrel shape with a sealed lower end, and ventilation holes are uniformly distributed on the circumferential surface of the lower joint 2; each vent hole is internally provided with a sand-proof filter screen 5. During operation natural gas accessible sand prevention filter screen 5 enters into the inside of this downhole choke ware, sets up the aim at of sand prevention filter screen 5: impurities (such as solid particles like gravel) in the natural gas are limited to the outside through the sand prevention filter screen 5, so that the problem that the impurities wear parts after entering the underground throttle along with the natural gas is avoided.
The lower main body pipe 20 is provided with a sealing rubber cylinder 8; a release sleeve 22 is arranged on the connecting inner tube 19 above the sealing rubber cylinder 8 through a deblocking pin B21; the outer surface of the connecting inner tube 19 is provided with a fitting flange 35; the assembly flange 35 is connected to the release sleeve 22 by means of the deblocking pin B21; one end of the release sleeve 22 is provided with a limit sleeve ring B23 through a pin; a deblocking spring B24 is arranged between the assembly flange 35 and the limit collar B23; the fitting flange 35 is provided with a balance hole 54 (see fig. 10 of the specification). The purpose of the balance holes 54 is to: the inside of the release sleeve 22 at the two sides of the assembly flange 35 is communicated through the balance holes 54, so that the occurrence of 'pressure holding' in the moving process of the release sleeve 22 is avoided, and the moving problem of the release sleeve 22 is prevented.
The lower main body pipe 20 below the sealing rubber cylinder 8 is provided with an extrusion sleeve 26 in a sliding manner through a sealing flange 25 arranged on the circumferential surface; the upper end of the extrusion sleeve 26 is provided with a sealing ring 27 through a pin; the inner surface of the sealing ring 27 is provided with one-way ratchets, and the circumferential surface of the lower main body tube 20 is correspondingly provided with one-way tooth grooves; the sealing ring 27 is engaged with the lower body tube 20 by a one-way ratchet. The purpose of the seal ring 27 is thus to: so that the sealing ring 27 can only move unidirectionally relative to the lower main body pipe 20, and further the problem of early deblocking caused by retreating after the extrusion sleeve 26 finishes setting is avoided.
The lower main body pipe 20 and the lower joint 2 below the sealing ring 27 are provided with a punching hole 28 (see fig. 11 of the specification); in operation, natural gas may enter the interior of the compression sleeve 26 through the crimp holes 28 to pressurize it. A baffle ring B29 is arranged between the lower end of the extrusion sleeve 26 and the lower joint 2.
When the downhole choke with the secondary choke function works, the downhole choke is firstly put into a specified position of a natural gas well, then the downhole choke is suddenly stopped and lifted up, in the process, the slips 4 move downwards relative to the central pipe 3 under the influence of self gravity and inertia, and in the process of moving downwards, the claws 31 of the slips 4 are radially spread along the conical surface of the slip cone 10 to be clamped with the wall of the natural gas well, so that the slips 4 realize setting. After the slips 4 are set, the lifting of the downhole choke is stopped.
In the process, natural gas in the natural gas well passes through the sand prevention filter screen 5 and then enters the lower joint 2, and the limit valve rod 46 is pressed upwards, so that the limit valve rod moves upwards after overcoming the elastic force of the adjusting spring B48 and finally collides with the sealing sleeve 17. At this time, the sealing sleeve 17 seals the flow hole 53 of the limit valve rod 46 (see fig. 13 of the specification), so that the natural gas below the limit valve rod 46 forms a "pressure hold" in the lower main pipe 20; in the natural gas "holding pressure" process, the natural gas pressure in the lower main body pipe 20 is gradually increased, and enters the annular space between the extrusion sleeve 26 and the lower main body pipe 20 through the pressing hole 28, so as to press the annular space, and the extrusion sleeve 26 is pushed to move upwards to extrude the sealing rubber sleeve 8; the packing element 8 is radially deformed upon compression, thereby completing the packing element setting from which the downhole choke completes the setting (see fig. 12 of the specification).
When the pressure of the natural gas in the lower main body pipe 20 is increased to the maximum state, the natural gas pushes the sealing sleeve 17 through the limit valve rod 46, so that after the sealing sleeve 17 shears the shearing pin 16, the sealing sleeve moves upwards to be in contact with the air tap joint 14 under the action of the compression spring 18 and keeps a certain distance from the limit valve rod 46, and the limit valve rod 46 is prevented from being contacted with the sealing sleeve 17 again under the action of the natural gas. The downhole choke thus far enters the normal production phase (see figure 15 of the specification).
When the underground throttle is normally produced, natural gas enters the lower joint 2 through the sand-proof filter screen 5, enters the inner connecting pipe 19 of the primary throttle valve 7 along the inner hole of the lower main body pipe 20, and enters the lower connecting cylinder 45 through a gap between the inner hole of the inner connecting pipe 19 and the sealing pin 52; and then sequentially passes through the upper connecting cylinder 44 and the sealing sleeve 17 through the circulation hole 53 of the limit valve rod 46 to enter the air tap joint 14. And then into the interior of the assembled housing 36 of the secondary throttle valve 6. Then the natural gas pushes the sealing piston 37 to overcome the elastic force of the adjusting spring A41 and then move upwards along the assembly shaft 40, so that the inner flange 42 is communicated with each long through hole 43; natural gas then passes through the inner flange 42 and through the respective flow-through slots 43 and into the upper body tube 9 and finally out along the other tool string after passing through the central tube 3 and the upper fitting 1.
In the normal production process of the underground throttle, as the inner hole of the connecting inner pipe 19 is in a horn shape, when natural gas passes through the inside of the primary throttle valve 7, the flow area of the natural gas suddenly becomes large, so that the purpose of primary throttle pressure reduction is achieved; in addition, when natural gas passes through the inside of the secondary throttling air tap 6, the natural gas passes through the inner flange 42 and each flow long hole 43 and then enters the upper main body pipe 9, and the flow area of the natural gas suddenly increases when the natural gas passes through due to the minimum inner diameter of the inner flange 42, so that the purpose of secondary throttling and depressurization is achieved; according to the law of conservation of energy, the internal enthalpy value of the natural gas before and after throttling is kept unchanged in the processes of primary throttling depressurization and secondary throttling depressurization, and the natural gas pressure is reduced after throttling; expanding the volume of the gas; the potential energy of molecular interaction increases as the molecular spacing increases. The increase of potential energy causes the reduction of kinetic energy, and the reduction of molecular kinetic energy is shown as temperature reduction, so that the purpose of reducing temperature and pressure of natural gas can be achieved.
In the above process, when the natural gas pressure is higher, the distance that the limit valve rod 46 of the primary throttle valve 7 moves upwards against the elastic force of the adjusting spring B48 is larger; the farther the conical surface of the limit valve stem 46 is from the inner hole of the connecting inner tube 19, the larger the flow area (i.e., throttle area) of the natural gas is; the smaller the reverse; similarly, when the natural gas pressure is higher, the distance that the sealing piston 37 of the secondary throttle valve 6 moves upwards after overcoming the elastic force of the adjusting spring A41 is larger; the larger the flow area (i.e., the throttle area) of the flow long hole 43 under the seal piston 37 communicating with the inner flange 42; the smaller the reverse; thus, the flow area in the primary throttling depressurization and the secondary throttling depressurization processes can be matched with the pressure of the natural gas. Therefore, the underground throttle device can achieve the purpose of maximum gas production without replacement.
When the underground throttle with the secondary throttle function needs to be unsealed after normal production is finished (see fig. 16 of the specification), the upper joint 1 of the underground throttle is firstly jarred by other tools, and the upper joint 1 transmits the jarring force to the connecting inner pipe 19 through the central pipe 3, the upper main body pipe 9, the assembly shell 36, the air tap joint 14, the connecting sleeve 15, the upper connecting cylinder 44 and the lower connecting cylinder 45 in sequence after being jarred. The connecting inner pipe 19 is sheared off the deblocking pin B21 after being jarred; after the deblocking pin B21 is sheared, the release sleeve 22 moves up a distance under the action of the deblocking spring B24, so that the upper part of the packing element 8 is unsupported, and the deblocking of the packing element 8 is completed (see fig. 18 of the specification).
After the sealing rubber cylinder 8 is unsealed, the jarring is stopped, the underground throttle is lifted up through the upper joint 1, and the upper main body pipe 9 is driven to move up together through the central pipe 3 in the upward moving process of the upper joint 1. So that the upper body tube 9, after shearing the deblocking pin a11, moves relative to the slips 4 and slip cone 10. After the deblocking pin A11 is sheared, the slip cone 10 moves downwards relative to the slip 4 under the action of the elastic force of the deblocking spring A13, so that the claw 31 of the slip 4 loses the support of the slip cone 10, the deblocking of the slip 4 is finished, and then the downhole choke is continuously lifted until the downhole choke is lifted out of a natural gas well, and the deblocking salvaging process can be finished.
This downhole choke ware with secondary throttle function, simple structure, convenient to use, through the structural design of primary throttle air cock and secondary throttle air cock, make this downhole choke ware not only can carry out twice throttle to the natural gas of downhole high temperature high pressure, the throttle area can change along with the change of natural gas pressure moreover, make its throttle area and natural gas pressure assorted all the time, solved the problem that current choke ware exists can only single throttle and throttle area is unadjustable, satisfied the needs that people used.
Claims (6)
1. The utility model provides a downhole choke with secondary throttle function, it comprises top connection (1), lower clutch (2), center tube (3), slips (4), slips cone (10), secondary throttle air cock (6), primary throttle air cock (7) and sealed packing element (8), its characterized in that: the upper end of the secondary throttling air tap (6) is connected with an upper main body pipe (9) through threads; the upper end of the upper main body pipe (9) is provided with an upper joint (1) through a central pipe (3) in a threaded manner; the central pipe (3) is sleeved with a slip (4), and a slip cone (10) is arranged on an upper main body pipe (9) below the slip (4) through a deblocking pin A (11); the lower end of the slip cone (10) is provided with a limit lantern ring A (12) through a pin; an unsealing spring A (13) is arranged between the limiting collar A (12) and the upper main body pipe (9); the lower end of the secondary throttling air tap (6) is connected with a connecting sleeve (15) through an air tap joint (14) in a threaded manner; the lower end of the connecting sleeve (15) is connected with a primary throttling air tap (7) through threads; a sealing sleeve (17) is arranged in the air tap joint (14) through a shearing pin (16), and a compression spring (18) is arranged between the sealing sleeve (17) and the primary throttling air tap (7); the lower end of the primary throttle air tap (7) is connected with a lower main body pipe (20) through a connecting inner pipe (19) in a threaded manner; the lower end of the lower main body pipe (20) is connected with a lower joint (2) through threads; a sealing rubber cylinder (8) is arranged on the lower main body pipe (20); a release sleeve (22) is arranged on the connecting inner tube (19) above the sealing rubber cylinder (8) through a deblocking pin B (21); one end of the release sleeve (22) is provided with a limit sleeve ring B (23) through a pin; a deblocking spring B (24) is arranged between the limiting collar B (23) and the connecting inner tube (19); an extrusion sleeve (26) is slidably arranged on the lower main body pipe (20) below the sealing rubber cylinder (8) through a sealing flange (25) arranged on the circumferential surface; the upper end of the extrusion sleeve (26) is provided with a sealing ring (27) through a pin; a pressing hole (28) is arranged on the lower main body pipe (20) and the lower joint (2) below the sealing ring (27); a baffle ring B (29) is arranged between the lower end of the extrusion sleeve (26) and the lower joint (2);
the secondary throttle air tap (6) consists of an assembly shell (36), a sealing piston (37), a circulation cylinder (38), a sealing cover (39), an assembly shaft (40) and an adjusting spring A (41); the upper end of the assembly shell (36) is in threaded connection with the upper main body pipe (9); the lower end of the assembly shell (36) is in threaded connection with the air tap joint (14); a circulation cylinder (38) is fixedly arranged in the assembly shell (36) through an inner flange (42); an assembly shaft (40) is fixedly arranged in the circulation cylinder (38) through a sealing cover (39); the assembly shaft (40) extends into the inner flange (42); the assembly shaft (40) is provided with a sealing piston (37) in a sliding manner; the sealing piston (37) is in intermittent sealing connection with the inner flange (42); an adjusting spring A (41) is arranged between the sealing piston (37) and the sealing cover (39); a plurality of long circulation holes (43) are uniformly distributed on the circumferential surface of the circulation cylinder (38), and each long circulation hole (43) is in sliding connection with the sealing piston (37);
the primary throttling air tap (7) consists of an upper connecting cylinder (44), a lower connecting cylinder (45), a limit valve rod (46), a baffle ring A (47) and an adjusting spring B (48); the upper end of the upper connecting cylinder (44) is in threaded connection with the connecting sleeve (15); a baffle ring A (47) is arranged between the upper connecting cylinder (44) and the connecting sleeve (15); the lower end of the upper connecting cylinder (44) is connected with a lower connecting cylinder (45) through threads; a limit valve rod (46) is slidably arranged in the upper connecting cylinder (44) through an assembly cavity (49); an adjusting spring B (48) is arranged between the limit valve rod (46) and the upper connecting cylinder (44);
the limit valve rod (46) is of an integrated structure and consists of a valve seat (50), an assembly flange (51) and a sealing pin (52); one end of the valve seat (50) is provided with a sealing pin (52); one end of the sealing pin (52) is conical; flow holes (53) are uniformly distributed on the valve seat (50) around the sealing pin (52); an assembly flange (51) is arranged on the lower end circumferential surface of the valve seat (50); the assembly flange (51) is in sliding connection with an assembly cavity (49) of the upper connecting cylinder (44); the valve seat (50) is in sliding connection with the inner hole of the upper connecting cylinder (44);
the outer surface of the connecting inner pipe (19) is provided with an assembling flange (35); the assembly flange (35) is connected with the release sleeve (22) through the deblocking pin B (21); a deblocking spring B (24) is arranged between the assembly flange (35) and the limit collar B (23); the assembly flange (35) is provided with a balance hole (54); the inner hole of the connecting inner tube (19) is horn-shaped with the upper part wide and the lower part narrow, and the sealing pin (52) is in intermittent sealing connection with the inner hole of the connecting inner tube (19).
2. A downhole choke with secondary choke function according to claim 1, characterized in: the outer surface of the central tube (3) is of a stepped shaft type, and a thrust flange (30) is arranged at the end head of the lower end of the central tube (3); the slip (4) consists of a claw (31) and an assembling cylinder (32); the lower end of the assembly cylinder (32) is uniformly provided with a plurality of claws (31) through a rotary pin (33); the outer surface of each claw (31) is provided with a latch; the inner surface of each claw (31) is provided with a retaining groove (34); the retaining groove (34) is in a hook shape; the retaining groove (34) is in abutting connection with the end surface of the retaining flange (30) at intervals.
3. A downhole choke with secondary choke function according to claim 1, characterized in: an assembling flange (35) is arranged on the circumferential surface of the upper main body pipe (9); the assembly flange (35) is connected with the slip cone (10) through the deblocking pin A (11); an unsealing spring A (13) is arranged between the assembly flange (35) and the limit collar A (12).
4. A downhole choke with secondary choke function according to claim 1, characterized in: the outer surface of the sealing sleeve (17) is stepped; the thick end part of the sealing sleeve (17) is connected with the air tap joint (14) through a shearing pin (16); a compression spring (18) is arranged between the thick end part of the sealing sleeve (17) and the upper connecting cylinder (44); the thin end part of the sealing sleeve (17) is in sliding connection with the upper connecting cylinder (44); the thin end head of the sealing sleeve (17) is in intermittent sealing connection with a circulation hole (53) of the limit valve rod (46).
5. A downhole choke with secondary choke function according to claim 1, characterized in: the inner surface of the sealing ring (27) is provided with one-way ratchets, and the circumferential surface of the lower main body pipe (20) is correspondingly provided with one-way tooth grooves; the sealing ring (27) is meshed with the lower main body pipe (20) through a one-way ratchet.
6. A downhole choke with secondary choke function according to claim 1, characterized in: the lower joint (2) is in a barrel shape with a sealed lower end, and ventilation holes are uniformly distributed on the circumferential surface of the lower joint (2); a sand-proof filter screen (5) is arranged in each vent hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360445.9A CN108343405B (en) | 2018-04-20 | 2018-04-20 | Underground throttle with secondary throttle function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360445.9A CN108343405B (en) | 2018-04-20 | 2018-04-20 | Underground throttle with secondary throttle function |
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| Publication Number | Publication Date |
|---|---|
| CN108343405A CN108343405A (en) | 2018-07-31 |
| CN108343405B true CN108343405B (en) | 2023-12-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810360445.9A Active CN108343405B (en) | 2018-04-20 | 2018-04-20 | Underground throttle with secondary throttle function |
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| CN (1) | CN108343405B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109057761B (en) * | 2018-08-14 | 2020-09-29 | 哈尔滨艾拓普科技有限公司 | Natural gas well underground throttle for electric control throwing and fishing |
| CN112922564B (en) * | 2021-02-04 | 2023-06-30 | 西安石油大学 | Underground throttling device based on special degradable alloy ball taper plug adjustment |
| CN114687690B (en) * | 2022-03-31 | 2024-03-29 | 中海石油(中国)有限公司 | Slip setting mechanism and downhole throttler comprising same |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103410485A (en) * | 2013-08-14 | 2013-11-27 | 东北石油大学 | Hole-regulating variable-pressure down-hole choke |
| WO2014153314A1 (en) * | 2013-03-18 | 2014-09-25 | Schlumberger Canada Limited | Sleeve valve |
| CN106014356A (en) * | 2016-07-12 | 2016-10-12 | 泸州聚源石油科技有限公司 | Sand-controlled movable type downhole throttle capable of balancing pressure |
| CN106285580A (en) * | 2016-09-30 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of underground throttle device |
| CN208106394U (en) * | 2018-04-20 | 2018-11-16 | 长江大学 | A kind of underground throttle device with second throttle function |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2596408C (en) * | 2005-02-08 | 2012-04-17 | Welldynamics, Inc. | Flow regulator for use in a subterranean well |
| GB201310187D0 (en) * | 2013-06-07 | 2013-07-24 | Petrowell Ltd | Downhole Choke |
-
2018
- 2018-04-20 CN CN201810360445.9A patent/CN108343405B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014153314A1 (en) * | 2013-03-18 | 2014-09-25 | Schlumberger Canada Limited | Sleeve valve |
| CN103410485A (en) * | 2013-08-14 | 2013-11-27 | 东北石油大学 | Hole-regulating variable-pressure down-hole choke |
| CN106014356A (en) * | 2016-07-12 | 2016-10-12 | 泸州聚源石油科技有限公司 | Sand-controlled movable type downhole throttle capable of balancing pressure |
| CN106285580A (en) * | 2016-09-30 | 2017-01-04 | 中国石油化工股份有限公司 | A kind of underground throttle device |
| CN208106394U (en) * | 2018-04-20 | 2018-11-16 | 长江大学 | A kind of underground throttle device with second throttle function |
Non-Patent Citations (1)
| Title |
|---|
| 单胶筒防下滑井下节流装置的研制与应用;卫亚明;肖述琴;杨旭东;于志刚;李旭日;;石油机械(第07期);第71-73页 * |
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| CN108343405A (en) | 2018-07-31 |
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