CN201615239U

CN201615239U - Pressure balancing plug valve

Info

Publication number: CN201615239U
Application number: CN2009200752830U
Authority: CN
Inventors: 崔炳跃; 顾海洋; 崔长胜; 金仁才; 王胜贵
Original assignee: Yancheng Huayue Petroleum Machinery Manufacturing Co Ltd
Current assignee: Yancheng Huayue Petroleum Machinery Manufacturing Co Ltd
Priority date: 2009-07-24
Filing date: 2009-07-24
Publication date: 2010-10-27
Anticipated expiration: 2019-07-24

Abstract

The utility model relates to a pressure balancing plug valve, which comprises a valve body, an upper valve seat, a lower valve seat, a ball valve core, a turning block and needle valves, wherein the upper valve seat and the lower valve seat are arranged on the ledge of the valve body; the turning block is connected with the ball valve core; the needle valves are arranged at the right end of the valve body; the turning block turns to drive the ball valve core to turn; the ball valve core is sealed with the upper valve seat and the lower valve seat by sealing gaskets; the valve body is transversely sealed with the upper valve seat and the lower valve seat by sealing rings; a wave spring is arranged between the valve body and the lower valve seat, between the valve body and the upper valve seat as well as between the valve body and a gland respectively, so as to realize the longitudinal sealing of the valve seats and the valve body; and the valve body is provided with pressure balancing channels that are controlled to be opened and closed by the upper needle valve and the lower needle valve like an upper valve chamber and a lower valve chamber of the plug valve. When the blowout occurs in the well drilling process, the upper needle valve is opened, so that the pressure balancing channels can be communicated with an upper valve chamber and a lower valve chamber of the ball valve core, and the pressure at the upper and the lower ends of the plug valve can be balanced; at the moment, the plug valve can be opened easily by a wrench.

Description

The pressure balance stopcock

Technical field

The utility model relates to a kind of pressure balance stopcock, particularly relates to a kind of principal pressure balanced plug valve, prevents a kind of pipe valve of blowout when being used for oil and gas well drilling, belongs to the manufacturing technology field of blowout prevention instrument.

Background technique

In the well head fracturing process, for oil after preventing high pressure sprays in oil pipe, throw in tubing plug the oil pipe planted agent and block oil pipe, because of being arranged in the oil pipe, high pressure exists, be lowered in the well in order to make tubing plug, need under installing above the well head, to throw the instrument of blanking plug." the high pressure stopcock of extra strong pipe screw thread is as the instrument of throwing blanking plug, and when high pressure oil will spray, the stopcock lower end was in high pressure conditions; the upper end does not have pressure; the single face thrust of ball has more than 20 ton, is difficult to open with spanner, and tubing plug is also just thrown not advance in the well now to adopt 2 7/8 usually.

The model utility content

The utility model provides a kind of pressure balance stopcock, and the utility model stopcock structure is simple, easy to operate, under when throwing tubing plug, the balance that keep-ups pressure can easily be opened stopcock, casts tubing plug, has improved working efficiency greatly.

In order to achieve the above object, the utility model provides a kind of pressure balance stopcock, comprise valve body, be installed on the valve body shoulder on, lower valve base, the ball-type spool, switch block that connects with the ball-type spool and the needle type valve that is arranged on the valve body right-hand member, wherein, the rotation of switch block can drive valve core rotation, seal by sealing gasket between ball-type spool and the last lower valve base, there is seal ring to realize transverse sealing between valve body and the last lower valve base, at valve body and lower valve base, wavy spring is arranged respectively between upper valve base and the pressure cap, realize the longitudinal sealing of valve seat and valve body, on described valve body, have pressure equalisation passage, communicate with the last lower valve chamber of stopcock respectively, control its logical closing by needle type valve up and down.

Further, described balance channel uses needle type valve to control.

Further, described needle type valve body by scyewed joint on the stopcock valve body.

Further, described pressure balance stopcock, it is characterized in that: described needle type valve comprises the needle type valve body and is arranged on needle type valve switch block in the needle type valve body, connects with anchor ear between needle type valve switch block and the push rod, has seal ring to realize sealing between needle type valve body and the anchor ear.

Pressure balance stopcock of the present utility model is when drillng operation, last needle type valve on the stopcock is normally closed, following needle type valve is often opened, when drilling well produces blowout, open needle type valve, pressure equalisation passage is communicated with the last lower valve chamber of spherical valve core, make the balance of pressure at two ends up and down of stopcock, at this moment, utilize spanner just can easily open stopcock.Use two needle type valves, wherein one not only can be used as standbyly, also can play the safety protection effect, guarantees carrying out smoothly of kill-job work.

Description of drawings

Fig. 1 is the structural representation of pressure balance stopcock;

Fig. 2 is the structural representation of needle type valve.

Wherein: 1. valve body, 2. valve seals, 3. pressure cap, 4. upper valve base, 5. upper valve base seal ring, 6. ball-type spool, 7. switch block seal ring, 8. switch block, 9. lower valve base, 10. lower valve base seal ring, 11. sealing gaskets, 12. wavy springs, 13. needle type valves, 14. needle type valve bodies, 15. needle type valve switch blocks, 16. anchor ears, 17. sealing gaskets, 18. push rods, 20. pressure equalisation passage.

Embodiment

Provide the utility model preferred embodiment below in conjunction with accompanying drawing, to describe the technical solution of the utility model in detail.

Please refer to Fig. 1, as shown in Figure 1, pressure balance stopcock lower valve base 9 is installed on the shoulder of valve body 1, seal with sealing gasket 11 between ball-type spool 6 and upper valve base 4 and the lower valve base 9, compress with pressure cap, ball-type spool 6 links with switch block 8 again, rotates switch block 8 with spanner and drives spool 6 rotations.Between valve body 1 and upper valve base 4 and the lower valve base 9 seal ring 5 and 10 are arranged, realize the transverse sealing of valve body 1 and valve seat, at valve body 1 and lower valve base 9, wavy spring 12 is arranged between upper valve base 4 and the pressure cap, realize the longitudinal sealing of upper valve base 4 and lower valve base 9 and valve body 1, seal ring 7 sealings are also arranged between valve body 1 and the switch block 8.On valve body 1, have pressure equalisation passage 20, with its logical closing of two needle type valves, 13 controls.The structure of needle type valve 13 as shown in Figure 2, needle type valve 13 comprises needle type valve body 14, be arranged on the needle type valve switch block 15 in the needle type valve body 14, be connected with anchor ear 16 between needle type valve switch block 15 and the push rod 18, there is seal ring to realize sealing between needle type valve body 14 and the anchor ear 16, needle type valve body 14, rotates switch block 8 drive push rods with spanner and moves forward and backward on stopcock valve body 1 by scyewed joint, realizes opening and closing of needle type valve 13.Connect with anchor ear between needle type valve 13 switch blocks 8 and the push rod, push rod is only moved when moving forward and backward and do not rotate, prevent to produce friction with the stopcock valve body and wear and tear because of push rod rotates.

During work, when drilling well produces blowout, open the needle type valve 13 on the stopcock, pressure equalisation passage is communicated with the last lower valve chamber of spherical valve core 6, the pressure at two ends up and down of stopcock is a balance, at this moment, utilizes spanner just can easily open stopcock by switch block 8.

Though the utility model discloses as above with preferred embodiment, so it is not in order to limit the utility model.Have in the technical field under the utility model and know the knowledgeable usually, in not breaking away from spirit and scope of the present utility model, when being used for a variety of modifications and variations.Therefore, protection domain of the present utility model is as the criterion when looking claims person of defining.

Claims

1. pressure balance stopcock, comprise valve body, be installed on the valve body shoulder on, lower valve base, the ball-type spool, switch block that connects with the ball-type spool and the needle type valve that is arranged on the valve body right-hand member, wherein, the rotation of switch block can drive valve core rotation, seal by sealing gasket between ball-type spool and the last lower valve base, there is seal ring to realize transverse sealing between valve body and the last lower valve base, at valve body and lower valve base, wavy spring is arranged respectively between upper valve base and the pressure cap, realize the longitudinal sealing of valve seat and valve body, it is characterized in that: on described valve body, have pressure equalisation passage, communicate with the last lower valve chamber of stopcock respectively, control its logical closing by needle type valve up and down.

2. pressure balance stopcock according to claim 1 is characterized in that: described needle type valve body by scyewed joint on the stopcock valve body.

3. pressure balance stopcock according to claim 1, it is characterized in that: described needle type valve comprises the needle type valve body and is arranged on the interior needle type valve switch block of needle type valve body, connect with anchor ear between needle type valve switch block and the push rod, have seal ring to realize sealing between needle type valve body and the anchor ear.