Valve needle of automatic adjusting throttle valve for pressure control drilling
An automatic adjustment and managed pressure drilling technology, which is applied in wellbore/well valve device, earthwork drilling, wellbore/well components, etc. The technical requirements of pressure drilling, the difficulty of meeting the control pressure requirements of managed pressure drilling, the large vibration of the conical valve needle, etc., achieve the effects of enhanced wear resistance, good linearity, and high connection reliability
Inactive Publication Date: 2013-04-17
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
The conical valve needle vibrates greatly and the valve stem is easy to break; the wedge-shaped valve needle solves the problem of vibration and valve stem fracture, but the throttling performance is poor, the throttling is not easy to control, and the wedge-shaped surface is easy to stab
[0005] At present, there is no spool used for the automatic adjustment of the throttle valve in MPD. The control idea, control accuracy and effect of the conventional choke valve spool cannot meet the technical requirements of MPD operations, and it is difficult to meet the control pressure of MPD. Require
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[0020] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:
[0021] Such as figure 1 , figure 2 As shown, a valve needle of an automatic pressure control drilling throttle valve includes a valve core 1 and a valve stem 2, the lower end surface of the valve stem 2 is provided with a boss 3, and the valve core 1 is provided with a boss 3 The matching through hole 4, the valve core 1 is set on the boss 3 of the valve stem 2, and the through hole 4 of the valve core 1 and the boss 3 are interference fit, and the lower end of the through hole 4 and the boss 3 are arranged There is a surfacing welding connection part 5, and an inner hole 6 is provided on the lower end surface of the boss 3, and the inner hole 6 extends axially along the valve stem 2 to the inside of the valve stem 2, and the upper part of the valve stem 2 is provided with a radially extending conn...
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The invention discloses a valve needle of an automatic adjusting throttle valve for pressure control drilling. The valve needle comprises a valve spool (1) and a valve rod (2), a boss (3) is arranged at the lower end of the valve rod (2), the valve spool (1) is sleeved on the boss (3) of the valve rod (2), an overlaying connection portion (5) is arranged between the lower end of a through hole (4) and the boss (3), an inner hole (6) is arranged on the lower end face of the boss (3), a connection hole (7) radially extending is arranged on the upper portion of the valve rod (2), and the inner hole (6) is communicated with the outside of the valve rod (2) through the connection hole (7). The valve needle has the advantages that the valve spool and a valve body are firmly connected by means of interference fit and are fixed in an end taper angle area in an overlaying manner, inlet and outlet pressure drop of the automatic adjusting throttle valve for pressure control drilling is linearly related to opening, the valve needle is fine in linearity and controllability, high in precision and the like, pressure difference between fluids at the upper end and the lower end of the valve spool is balanced by a fluid channel in the valve rod, and torque needed by rotation of the valve needle is greatly reduced.
Description
technical field [0001] The invention relates to the technical field of throttle valves, in particular to a valve needle of a pressure-management drilling automatic adjustment throttle valve. Background technique [0002] Managed pressure drilling refers to the real-time control of wellhead casing pressure through the equipment and technology of the managed pressure drilling system, so as to realize the precise control of the annular pressure at the bottom of the well during the whole process of drilling, single connection and tripping. In the implementation of managed pressure drilling, the control of wellhead casing pressure is very important. As the key component equipment for wellbore pressure control, the pressure-controlled choke manifold controls the wellhead back pressure by generating adjustable chokes, and realizes pressure control under static and dynamic conditions. The bottom hole pressure is relatively stable during the drilling process, and the control of the b...
Claims
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IPC IPC(8): E21B34/02
Inventor 王国荣付玉坤刘清友陶思宇朱颢
Owner SOUTHWEST PETROLEUM UNIV