FIELD: oil and gas industry.
SUBSTANCE: wellhead equipment includes a housing, a shutoff valve, a casing-head stuffing box and a sampler. The sampler is installed outside the housing and made as a hollow blinded cylinder with a piston. The sampler is equipped with an adjusting device generating counter pressure. The adjusting device may be made as an adjustable valve or as dead weights.
EFFECT: improved quality of the taken sample and excluded necessity of welding a branch with a sampler in a manifold line.
4 cl, 3 dwg
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