Wellhead anti-theft sampling device

Abstract

The invention relates to a wellhead anti-theft sampling device. The wellhead anti-theft sampling device comprises a sampling pipe, wherein a three-way cock valve is fixed in the sampling pipe; the three-way cock valve comprises a valve body, a spherical valve element and a valve rod for controlling the spherical valve element; a protective jacket is arranged on the periphery of the valve rod, theinner end of the protective jacket is connected with the valve body in a sealed mode, the outer end of the protective jacket stretches out of the sampling pipe and over the outer end of the valve rod,a valve rod square tenon is arranged at the outer end of the valve rod, the middle section of the protective jacket is provided with a fixing sleeve, the fixing sleeve and the protective jacket are coaxial, the valve rod penetrates out of the center of the bottom wall of the fixing sleeve, and a valve rod control mechanism is arranged in an inner cavity of the fixing sleeve; and the valve rod control mechanism comprises a lock cylinder which is coaxial with the fixing sleeve, the lock cylinder is in a T-shaped cross section, the large end of the lock cylinder is rotationally embedded in the inner cavity of the fixing sleeve, the small end of the lock cylinder is rotationally embedded in the inner cavity of the protective jacket, the center of the lock cylinder is fixedly connected with the valve rod, a plurality of lock cavities are formed in the lock cylinder, and locking mechanisms capable of locking or unlocking the lock cylinder and the fixing sleeve is arranged in the lock cavities. The wellhead anti-theft sampling device is convenient to operate and good in anti-theft performance.

Description

technical field [0001] The invention relates to a sampling valve, in particular to a wellhead anti-theft sampling device, which belongs to the technical field of oil well wellhead sampling valves. Background technique [0002] At present, the wellhead sampling valve of the oil well is installed on the vertical pipeline of the wellhead. Anyone can open the sampling valve on site with a handwheel or a wrench. Thieves can easily steal crude oil by opening the sampling valve, causing unnecessary economic losses to the enterprise. Loss, but also likely to cause on-site environmental pollution. [0003] The Chinese invention patent application with the publication number CN 104179500A discloses a built-in sampling device, which includes a sampling tube. Spherical valve core and valve stem. The valve body is provided with a horizontal inlet, a horizontal outlet on the same line as the horizontal inlet, and a vertical outlet perpendicular to the horizontal inlet. The horizontal inl...

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