First, the technical field: well head press mounting blowout tool, an oil and gas well drilling apparatus prevents the blowout for belonging manufacturing technology prevents the blowout tools.
Second, BACKGROUND: The well head fracturing process, to prevent the high pressure oil discharged from the tube in the pipeline should run tubing plug to block the pipeline, due to the presence of high-pressure tubing, tubing plug in order to lower into the well , well above the need to plug the tool mounting head cast down. Now usually 2 7/8 "high Ball upset tubing thread machine tool for projecting plug, when the high-pressure oil to be discharged, Ball lower end at high pressure, the top stress-free, single-sided thrust ball 20 tons, difficult to open with a wrench, tubing plug will not cast into the well.
Third, the design elements: The purpose of this device is to provide a simple structure, easy to operate well head press mounting blowout tool, when the next vote tubing plug can be easily opened, greatly improving the work efficiency.
The device includes upper and lower cock valve and elevates short festival, elevates short festival for storing tubing plug, its length is greater than the length of tubing plug. Cock valve and down the same, the structure comprises a Body, stuffy upper and lower seat, needle valve, rotating blocks and ball trim. The device is characterized in that:
1. Ball diameter increases. 2 7/8 "ID tubing thicker thread High Pressure Ball are usually in 50mm or less, but because they have to pass this Ball plug, an inner diameter of 62mm.
2. Increase the balancing device (needle valve structure). Body provided on the pressure balance channel, its two ports are ball cock valve and trim the top and bottom valve cavity communicates with a pressure equalization channel through needle valve to control its closure.
The device works: When drilling, the cock valve opening, needle valve closed on the cock valve, needle valve and cock valve at the lower cock valve are turned off. When drilling produces blowout, into the tubing plug, stored within elevates short festival, while closing the cock valve, open the needle valve at cock valve on the pressure equalization channel with a spherical valve cavity trim down the same, the next cock valve lead into the bottom of the high pressure elevates short festival, the upper and lower ends cock valve under pressure balance, this time using a wrench can easily open the next cock valve, tubing plug elevates short festival within under pressure equilibrium can automatically drop seal . The seal is successful, the tubing pressure will quickly drop to zero, that proved successful seal. After sealing successful, the needle valve on the fight on cock valve opening pressure. To prevent the press mounting blowout suppression plug failure during flying, you can put up and down the cock valve are closed, plug to fly out, to ensure the safety of press mounting blowout suppression.
IV. BRIEF DESCRIPTION: Brief description of the device is as follows:

          Figure 1                     Figure 2
Chart 1 well head press mounting blowout suppression
Figure 2 is a structural diagram of the upper and lower cock valve
Figure:.... 1 Body, 2 valve body seals, pressure cap 3, 4 valve on the seat, 5 valve seat ring on, 6 ball trim, 7 ,. turn block seals, turn 8 blocks. 9 next valve seat, 10. By valve seat ring, 11 seals, 12 wave springs, 13. needle valve.
V. DETAILED DESCRIPTION: The device is given below in conjunction with the accompanying drawings of the preferred embodiment: Figure 1, the apparatus includes upper and lower cock valve and elevates short festival, tubing plug deposit within elevates short festival. Up and down the cock valve structure shown in Figure 2, the lower valve seat 9 mounted on the shoulders of station 1 Body, ball trim 6 between the upper and lower valve seat and seal with a seal 11. And then pressing pressure cap. Ball trim 6 8 coupled with the switch block with a wrench to rotate the rotary-block drive trim. Body and between the upper and lower valve seat ring 5 and 10, to achieve a lateral seal Body and valve seat, and the Body and the next valve seat, there is a wave spring 12 between the valve seat and the pressure cap, to achieve a longitudinal valve seat and Body seal, there are seals 7 seal between the Body and the rotation block.
When drilling produces blowout, into the tubing plug, stored within elevates short festival, while closing the cock valve, open the needle valve 13 at cock valve on the pressure equalization channel with a spherical valve cavity trim down the same, the next cock the lower end of the high pressure valve incorporated into elevates short festival, the upper and lower ends cock valve under pressure balance at this time, use a wrench through the transfer block 8 can easily open the next cock valve, tubing plug elevates short festival within the pressure equilibrium state automatically fall under seal. The seal is successful, the tubing pressure will quickly drop to zero, that proved successful seal. After sealing successful, the needle valve on the fight on cock valve opening pressure. To prevent the press mounting blowout suppression plug failure during flying, you can put up and down the cock valve are closed, plug to fly out, to ensure the safety of press mounting blowout suppression.