Crude oil pipeline sampling head

Abstract

The invention discloses a crude oil pipeline sampling head. The crude oil pipeline sampling head comprises a cylinder barrel body, a piston, a front end cover and a rear end cover, wherein the front end cover and the rear end cover are arranged at two ends of the cylinder barrel body; the piston is arranged in an inner hole of the cylinder barrel body and is in sealing fit with the inner hole; the rod part of the piston passes through the front end cover and extends out of the front end cover; an oil inlet and an oil outlet which are communicated with the inner hole of the cylinder barrel body are formed on the side face of the cylinder barrel body; a pipeline for leading an oil sample out is arranged on the piston; a sampling amount adjusting piston is arranged on the rear end cover; andan adjusting screw rod is arranged between the rear end cover and the sampling amount adjusting piston. The crude oil pipeline sampling head is used for on-line sampling from a crude oil pipeline; the defect that hydraulic oil and sampled oil are mixed in a sampler in which hydraulic pressure serves as power in the prior art is overcome; and the authenticity of the sample is ensured. Because the once sampling amount can be adjusted, the requirement of clients on different working conditions is met and the level of sampling crude oil is improved.

Description

technical field [0001] The invention relates to a crude oil pipeline sampling head, which is used for on-line sampling of crude oil pipeline transportation. Background technique [0002] At present, no matter whether it is a sampler produced domestically or imported from abroad, there are the following two defects: (1) The sampling method uses hydraulic pressure as the power to push the sampling piston to do reciprocating motion to achieve the purpose of sampling, because the piston can move towards the sample chamber. The pressure of the rear hydraulic chamber must be greater than the pressure of the sample chamber. Due to the wear of the piston and the piston chamber and the aging of the O-ring, the hydraulic oil used as power and the sample oil in the pipeline are mixed in the sample chamber, so that all The representativeness of sampling is lost; (2) There is a common problem that the single sampling volume method is limited: the single sampling volume of the fixed sampl...

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Problems solved by technology

[0002] At present, no matter whether it is a sampler produced domestically or imported from abroad, there are the following two defects: (1) The sampling method uses hydraulic pressure as the power to push the sampling piston to do reciprocating motion to achieve the purpose of sampling, because the piston can move towards the sample chamber. The pressure of the rear hydraulic chamber must be greater than the pressure of the sample chamber. Due to the wear of the piston and the piston chamber and the aging of the O-ring, the hydraulic oil used as power and the sample oil in the pipeline are mixed in the sample chamber, so that all The representativeness of sampling is lost; (2) There is a common problem that the single sampling volume method is limited: the single sampling volume of the fixed sampling volume method determines the volume of the sample chamber during design, that is, the sampling piston is from the rear dead center to the front dead center The distance is fixed, so the single sampling volume cannot be changed; the single sampling volume of the adjustable sampling volume method is boosted by the booster pump, and the quantitative valve (adjustable solenoid valve) passes through the time controller or adjusts the effective volume of the quantitative valve. However, due to the nature of crude oil itself and the variety of changes in the pipeline transportation process, it is significantly affected by changes in viscosity, flow rate, temperature and pressure, so that the repeatability of single sampling volume Very poor, the sample taken is not representative

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