Well head device with ball valve backpressure function

Abstract

The invention relates to the field of petroleum machinery. A well head device specifically comprises a Christmas tree upper layer structure and is characterized in that the well head device further comprises a backpressure module which is installed at the bottom of the Christmas tree upper layer structure; the backpressure module comprises an oil pipe adapter, an oil pipe hanger, an oil pipe cross joint and a ball valve combination, the oil pipe hanger is installed in the oil pipe cross joint, and the top of the oil pipe cross joint is connected with the oil pipe adapter in a sealed mode; the ball valve combination comprises a hand wheel, a conversion connector, ball seats, a ball core and a ball rod; the two ball seats are installed in inner holes of the oil pipe hanger correspondingly, the ball core is installed between the two ball seats, and the ball rod is installed on one side of the ball core through the conversion connector and stretches out of the oil pipe cross joint; and the hand wheel is installed at the end of the outer side of the ball rod, and a through ball valve auxiliary module is used for ensuring the sealing and limiting effects among the hand wheel, the ball rod and the oil pipe cross joint. According to the well head device, through the structure, well tube backpressure, safe maintenance or Christmas tree replacing can be reliably achieved.

Description

technical field [0001] The invention relates to the field of petroleum machinery, in particular to a wellhead device with a ball valve back pressure function. Background technique [0002] In the current technology, the wellhead device that enters production after drilling, when the Christmas tree in the wellhead device is repaired or replaced, the method of killing the well is used to seal the pressure in the well. Since a large number of related equipment for killing the well is required, not only the cost is relatively high, but also Takes a lot of time. [0003] Another common method is to use a threaded back pressure valve to use the internal pressure of the wellbore to realize the backpressure of the wellbore. Due to the limited pressure of this method through the threaded connection, the disassembly and assembly of the thread requires special tools. Sealed through an O-ring, which does not seal well. At the same time, if a threaded back pressure valve is used, a va...

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