CN214118139U

CN214118139U - Multi-stage pneumatic wellhead sealing device

Info

Publication number: CN214118139U
Application number: CN202120043349.9U
Authority: CN
Inventors: 崔永金; 赵金平
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-09-03
Anticipated expiration: 2031-01-08

Abstract

The utility model discloses a wellhead sealing device of an oil field pumping unit, which comprises packing boxes A1 and A2, a broken rod blowout preventer B, a blowout preventer C and a following offset follower D; the polished rod passes in the middle of the well head sealing device, and the concrete structure is as follows: the short joint is an internal thread circular taper pipe, a circular base is arranged at the upper end of the short joint, an external thread matched with a ball socket pressing cap is arranged on the base, an internal thread matched with a well mouth is arranged at the lower end of the short joint, a ball socket is arranged at the upper end of the base, a groove matched with a ball head is arranged in the middle of the ball socket, an external thread matched with the ball head pressing cap is arranged on the outer side of the upper end of the ball socket, an annular round table is arranged at the lower end of the ball socket, the ball socket pressing cap presses the annular round table and is in threaded connection with the short joint external thread, and the ball head pressing cap presses the lower end of the ball socket and is in threaded connection with the external thread at the upper end of the ball socket; the lower end of the ball head is provided with a groove for installing a first O-shaped ring, the first O-shaped ring is arranged in the groove, and the ball head pressing cap presses the ball head to be in threaded connection with a ball socket; the upper end of the ball head is provided with a cavity, and the excircle of the cavity is provided with an external thread matched with the pressure cap of the blowout preventer.

Description

Multi-stage pneumatic wellhead sealing device

Technical Field

The utility model relates to a multistage vapour-pressure type well head sealing device of oil field beam-pumping unit well head belongs to oil machinery beam-pumping unit equipment technical field.

Background

The wellhead sealing device of the pumping unit is an important part for connecting the underground pipe column of the pumping unit and is a key point for production management and system energy consumption of the pumping unit. The packing box of the pumping unit of each oil production factory is characterized in that oil leakage at the sealing packing position is increasingly prominent and mostly in a jet shape in the long-time oil pumping production and abrasion process, and the environment is polluted. The problems that arise from this are many such as: the oil and gas resources are wasted, the maintenance cost of replacing packing is increased, large-area crude oil pollution is caused in a production area, the working strength of workers for recovering the environment is increased, the recovery process is complex, time is wasted, the yield of an oil well is influenced, and therefore a device suitable for well head sealing is needed.

Disclosure of Invention

In order to overcome the not enough in the above-mentioned technique, the utility model provides a well head sealing device, this oil field beam-pumping unit well head sealing device, it can effectual solution packing box compress tightly, lubricate, tuningout, profile modeling, rock the technical problem who follows etc..

The utility model provides a technical scheme that its technical problem adopted is: a wellhead sealing device of an oil pumping unit in an oil field comprises packing boxes A1 and A2, a rod-breaking blowout preventer B, a blowout preventer C and a follow-up deviation follower D; the polished rod passes in the middle of the well head sealing device, and the concrete structure is as follows: the short joint is an internal thread circular taper pipe, a circular base is arranged at the upper end of the short joint, an external thread matched with a ball socket pressing cap is arranged on the base, an internal thread matched with a well mouth is arranged at the lower end of the short joint, a ball socket is arranged at the upper end of the base, a groove matched with a ball head is arranged in the middle of the ball socket, an external thread matched with the ball head pressing cap is arranged on the outer side of the upper end of the ball socket, an annular round table is arranged at the lower end of the ball socket, the ball socket pressing cap presses the annular round table and is in threaded connection with the short joint external thread, and the ball head pressing cap presses the lower end of the ball socket and is in threaded connection with the external thread at the upper end of the ball socket; the lower end of the ball head is provided with a groove for installing a first O-shaped ring, the first O-shaped ring is arranged in the groove, and the ball head pressing cap presses the ball head to be in threaded connection with a ball socket; the upper end of the ball head is provided with a cavity, the excircle of the cavity is provided with an external thread matched with a blowout preventer press cap, the inner hole of the cavity is conical, the excircle of the cavity is provided with a ring groove for installing an O-shaped ring II, the inner cavity of the cavity is sequentially provided with a nylon guide sleeve I, a pressure spring and a rubber spiral packing I from bottom to top, the outer side of the cavity is provided with a blowout preventer press cap, the internal thread of the blowout preventer press cap is connected with the external thread of the cavity, the upper end of the inner hole of the blowout preventer press cap is provided with a ring groove, the nylon centering guide sleeve II is arranged in the groove, the upper end of the blowout preventer press cap is provided with a flange plate which is connected with a flange plate bolt at the lower end of the cavity of a lower packing box, the cavity of the lower packing box is a hollow cavity, and the cavity is sequentially provided with a spiral rubber packing II, the first C-shaped inflatable rubber ring is sleeved outside the second spiral rubber packing, a needle valve is arranged on the first C-shaped inflatable rubber ring and extends out of the cavity side surface hole of the lower packing box; a broken rod blowout prevention cavity is arranged on the upper surface of the lower section of the packing box cavity, a flange plate is arranged at the upper end of the broken rod blowout prevention cavity, the flange plate is connected with a flange plate at the lower end of the first section of the packing box cavity on the flange plate through a bolt, a broken rod blowout preventer is arranged at the lower end of the first section of the packing box cavity, a nylon guide sleeve III is arranged at the upper end of the first section of the packing box cavity, a spiral rubber packing III and a C-shaped inflatable rubber ring II are respectively arranged in the cavity from inside to outside, a needle valve on the C-shaped inflatable rubber ring II extends out of the upper surface through a hole of an upper cover, threads are arranged on the outer side of the upper end of the first section of the packing box cavity, internal threads are arranged in a press cap, a nylon guide sleeve III is arranged at the upper end of the spiral rubber packing III, an upper cover is arranged at the upper end of the nylon guide sleeve, and the press cap presses the upper cover and is in threaded connection with the cavity; the broken rod blowout preventer is characterized in that: the support is fixedly connected with a balancing weight, the support is hinged with a rocker arm through a cylindrical pin, the rocker arm is connected with a well sealing circular table, and an O-shaped rubber ring III is arranged on the well sealing circular table.

The utility model has the advantages that: because the C-shaped inflatable rubber ring acts on the flexible pressure of the spiral rubber packing, the pressure of the packing on the polish rod is also flexible, the fatigue time of the surface of the polish rod is prolonged, the surface of the polish rod is peeled off, the corrosion period is prolonged, the damage to the packing is reduced, and the service lives of the polish rod and the packing are prolonged. The wellhead sealing device is ensured to be coaxial with the polish rod by adjusting the follow-up offset follower and the nylon centering guide sleeve, and the polish rod is prevented from being worn eccentrically. The polished rod can appear tiny off-centre in the motion process, because the easy compressibility of the rubber circle is aerifyd to the C type, makes rubber spiral packing follow the polished rod and removes together, has realized the effect of off-centre but not eccentric wear. If the polished rod has certain bending, the packing can also bend along with the bending of the polished rod due to the adjusting function of the C-shaped inflatable rubber ring, so that excessive abrasion is prevented. To polished rod rocking, also because the adjustment effect of C type inflatable rubber circle, the packing rocks along with rocking of polished rod, avoids excessive wearing and tearing. To the oval, the thickness inequality of polished rod, or the condition of one section thick one section thin, because the easy adjustment easy compression characteristic of C type inflatable rubber circle, the hole can change along with the change of polished rod cross-section in the packing, and the elasticity of C type inflatable rubber circle makes the packing constantly laminate with the polished rod simultaneously to produce the same pressure to the polished rod in all directions, prevented revealing of oil gas. The pressure spring is filled with grease to lubricate the polished rod, and the surface of the polished rod is always provided with a layer of oil film, so that the friction is reduced, the corrosion is reduced, and the service life of the polished rod is prolonged. The packing force between the packing and the polish rod is reduced, the friction force is reduced, and the energy consumption is reduced.

Drawings

Fig. 1 is the structure schematic diagram of the multi-stage pneumatic wellhead sealing device of the utility model.

Fig. 2 is the structural schematic diagram of the multi-stage pneumatic wellhead sealing device rod-breaking blowout preventer.

Fig. 3 is the schematic view of the top view structure of the multi-stage pneumatic wellhead sealing device rod-breaking blowout preventer.

Figure 4 is the utility model discloses rubber circle structure schematic is aerifyd to multistage vapour-pressure type well head sealing device C type.

In the figure, 1, a short joint, 2, a ball socket pressing cap, 3, a ball socket, 4, a first O-shaped rubber ring, 5, a ball head, 6, a first nylon guide sleeve, 7, a ball head pressing cap, 8, a pressure spring, 9, a second O-shaped rubber ring, 10, a first spiral rubber packing, 11, a well sealer pressing cap, 12, a second nylon guide sleeve, 13, a lower packing box cavity, 14, a bolt, 15, a needle valve, 16, a first C-shaped inflatable rubber ring, 17, a second spiral rubber packing, 18, a broken rod blowout prevention cavity, 19, a broken rod blowout preventer, 20, a third nylon guide sleeve, 21, a bolt, 22, a first section packing box cavity, 23, a third spiral rubber packing, 24, a second C-shaped inflatable rubber ring, 25, a pressing cap, 26, an upper cover, 27, a needle valve, 28, a third nylon guide sleeve, 29, a balancing weight, 30, a support, 31, a third O-shaped rubber ring, 32, a well sealing circular table, 33, a rocker arm, 34 and a cylindrical pin.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and embodiments.

As shown in fig. 1-4, the wellhead sealing device of the oil pumping unit in the oil field comprises packing boxes A1 and A2, a rod-breaking blowout preventer B, a blowout preventer C and a follow-up deviation follower D; the polished rod passes in the middle of the well head sealing device, and the concrete structure is as follows: the short joint 1 is an internal thread circular taper pipe, a circular base is arranged at the upper end of the short joint, an external thread matched with a ball socket pressing cap 2 is arranged on the base, an internal thread matched with a well mouth is arranged at the lower end of the short joint 1, a ball socket 3 is arranged at the upper end of the base, a groove matched with a ball head 5 is arranged in the middle of the ball socket 3, an external thread matched with a ball head pressing cap 7 is arranged on the outer side of the upper end of the ball socket 3, an annular round table is arranged at the lower end of the ball socket 3, the ball socket pressing cap 2 presses the annular round table and is in threaded connection with the external thread of the short joint 1, and the ball head pressing cap 7 presses the lower end of the ball socket 3 and is in threaded connection with the external thread at the upper end of the ball socket 3; the lower end of the ball head is provided with a groove for installing a first O-shaped ring 4, the first O-shaped ring 4 is arranged in the groove, and a ball head pressing cap 7 presses the ball head 5 to be in threaded connection with the ball socket 3; the upper end of the ball head 5 is provided with a cavity, the excircle of the cavity is provided with an external thread matched with a blowout preventer press cap 11, the inner hole of the cavity is conical, the excircle of the cavity is provided with an annular groove for installing an O-shaped ring II 9, the inner cavity of the cavity is sequentially provided with a nylon guide sleeve I6, a pressure spring 8 and a rubber spiral packing I10 from bottom to top, the outer side of the cavity is provided with the blowout preventer press cap 11, the internal thread of the blowout preventer press cap 11 is connected with the external thread of the cavity, the upper end of the inner hole of the blowout preventer press cap 11 is provided with the annular groove, the nylon centering guide sleeve II 12 is installed in the groove, the upper end of the blowout preventer press cap 11 is provided with a flange plate which is connected with a flange plate bolt 14 at the lower end of the cavity 13 of the lower section packing box, the cavity 13 of the lower section packing box is a hollow cavity, the spiral rubber packing II 17 and the C-shaped inflatable rubber ring I16 are sequentially installed in the cavity, the C-shaped inflatable rubber ring I16 is sleeved outside the spiral rubber packing II 17, the needle valve 15 is arranged on the C-shaped inflatable rubber ring I16, the needle valve 15 extends out of the cavity side hole of the lower section packing box; a broken rod blowout prevention cavity 18 is arranged on the upper surface of the lower section of the packing box cavity 13, a flange plate is arranged at the upper end of the broken rod blowout prevention cavity 18, the flange plate is connected with a flange plate at the lower end of the first section of the packing box cavity 22 on the flange plate through a bolt 21, a broken rod blowout preventer 19 is arranged at the lower end of the first section of the packing box cavity 22, a nylon guide sleeve III 20 is arranged at the upper end of the first section of the packing box cavity 22, a spiral rubber packing III 23 and a C-shaped inflatable rubber ring II 24 are respectively arranged in the cavity 22 from inside to outside, a needle valve on the C-shaped inflatable rubber ring II 24 extends out through a hole of the upper cover 26, threads are arranged on the outer side of the upper end of the first section of the packing box cavity 22, internal threads are arranged in the pressing cap 25, a nylon guide sleeve III 28 is arranged at the upper end of the; the structure of the rod-breaking blowout preventer 19 is as follows: the support 30 is fixedly connected with a balancing weight 29, the support 30 is hinged with a rocker arm 33 through a cylindrical pin 34, the rocker arm 33 is connected with a well sealing circular table 32, and an O-shaped rubber ring III 31 is arranged on the well sealing circular table 32.

When maintaining packing box A1, A2 and disconnected pole preventer B, rotatory blowout preventer pressure cap 11 makes its downstream, and nylon guide pin bushing two 12 promote spiral packing one 10 downstream, because spiral packing one 10 and bulb cavity 5 are the cone structure, the shrink of spiral packing one 10 hole is hugged closely on the polished rod surface, prevents to reveal the emergence, and the bulb cavity 5 outside is equipped with the ring channel, installs O type circle in the ring channel, prevents that oil gas from here revealing. When the oil well is in a normal working state, the blowout preventer C is in a normally open state, and the blowout preventer C is closed when the packing box is maintained;

in the middle of the beam-pumping unit working process, the spiral packing constantly wears out, and the hole grow because the C type is aerifyd and is filled with high-pressure gas in the rubber circle, makes the timely shrink of spiral packing, and the internal surface is laminated outside the polished rod all the time to there is certain pressure, guarantees sealed realization. When the abrasion is to a certain degree, the air pressure in the air bag is reduced, slight leakage can occur, at the moment, the needle valve is used for inflating the air bag to continuously apply pressure to the spiral disk root, and the sealing of the wellhead is realized again. The eccentric structure of the deviation follower D is adjusted to enable the blowout preventer to be coaxial with the polish rod all the time, and packing deviation abrasion is prevented. When the polish rod is disconnected, the rod-breaking blowout preventer 19 rotates clockwise, and the lower end of the packing box A1 is blocked to prevent oil from spraying from the wellhead.

Claims

1. A multi-stage pneumatic wellhead sealing device comprises packing boxes A1 and A2, a rod-breaking blowout preventer B, a blowout preventer C and a follow-up deviation follower D; the method is characterized in that: the polished rod passes in the middle of the well head sealing device, and the concrete structure is as follows: the short circuit (1) is an internal thread circular taper pipe, a circular base is arranged at the upper end of the short circuit, an external thread matched with a ball socket pressing cap (2) is arranged on the base, an internal thread matched with a well mouth is arranged at the lower end of the short circuit (1), a ball socket (3) is arranged at the upper end of the base, a groove matched with a ball head (5) is arranged in the middle of the ball socket (3), an external thread matched with a ball head pressing cap (7) is arranged on the outer side of the upper end of the ball socket (3), an annular round table is arranged at the lower end of the ball socket (3), the ball socket pressing cap (2) presses the annular round table and is in threaded connection with the external thread of the short circuit (1; the lower end of the ball head is provided with a groove for installing a first O-shaped ring (4), the first O-shaped ring (4) is arranged in the groove, and a ball head pressing cap (7) presses the ball head (5) and is in threaded connection with the ball socket (3); the upper end of the ball head (5) is provided with a cavity, the excircle of the cavity is provided with an external thread matched with a blowout preventer pressure cap (11), the inner hole of the cavity is conical, the excircle of the cavity is provided with an annular groove for installing an O-shaped ring II (9), the inner cavity of the cavity is sequentially provided with a nylon guide sleeve I (6), a pressure spring (8) and a rubber spiral packing I (10) from bottom to top, the blowout preventer pressure cap (11) is installed outside the cavity, the internal thread of the blowout preventer pressure cap (11) is connected with the external thread of the cavity, the upper end of the inner hole of the blowout preventer pressure cap (11) is provided with an annular groove, the nylon centering guide sleeve II (12) is installed in the annular groove, the upper end of the blowout preventer pressure cap (11) is provided with a flange plate, the flange plate is connected with a flange plate bolt (14) at the lower end of the cavity (13) of a lower section packing box, the cavity (13) of the lower section is a hollow cavity, the spiral rubber packing II (17) and a C-shaped inflatable rubber ring I (16) are sequentially installed in the cavity, the C-shaped inflatable rubber ring I (16) is sleeved outside the spiral rubber packing II (17), a needle valve (15) is arranged on the C-shaped inflatable rubber ring I (16), and the needle valve (15) extends out of the cavity side surface hole of the lower section packing box; a broken rod blowout-preventing cavity (18) is arranged on the upper surface of the lower section of the packing box cavity (13), a flange plate is arranged at the upper end of the broken rod blowout-preventing cavity (18), the flange plate is connected with the flange plate at the lower end of the first section of the packing box cavity (22) on the flange plate through a bolt (21), a broken rod blowout preventer (19) is arranged at the lower end of the first section of the packing box cavity (22), a third nylon guide sleeve (20) is arranged at the upper end of the first section of the packing box cavity (22), a third spiral rubber packing (23) and a second C-shaped inflatable rubber ring (24) are respectively arranged in the first section of the packing box cavity (22) from inside to outside, a needle valve on the second C-shaped inflatable rubber ring (24) extends out through a hole of an upper cover (26), threads are arranged on the outer side of the upper end of the first section of the packing box cavity (22), internal threads are arranged in a pressing cap (25), the third nylon guide sleeve (28) is arranged at the upper end of the third spiral rubber packing (23), the upper end of the third nylon guide sleeve (28) is arranged with the upper cover (26), the pressing cap (25) presses the upper cover (26) and is in threaded connection with the cavity (22); the structure of the broken rod blowout preventer (19) is as follows: a support (30) is fixedly connected with a balancing weight (29), the support (30) is hinged with a rocker arm (33) through a cylindrical pin (34), the rocker arm (33) is connected with a well sealing circular table (32), and an O-shaped rubber ring III (31) is arranged on the well sealing circular table (32).