Multifunctional oil and gas airtight sampling detection device

Abstract

The invention discloses a multifunctional oil and gas airtight sampling detection device. The multifunctional oil and gas airtight sampling detection device comprises an airtight press-back mechanism,a pipeline, a positioning mechanism and a standard sampling detector, one end of the pipeline is connected with an oil conveying pipe sampling opening, the other end of the pipeline is connected witha side wall inlet of a tee joint at the lower end of the airtight press-back mechanism, the airtight press-back mechanism is positioned and fixed to an oil conveying pipe through a positioning mechanism, the pipeline is a telescopic universal joint connecting pipeline, a chain type fixed clamp is adopted for positioning, sawteeth are adopted in a locking part for sliding prevention, fixed connection of pipelines with different pipe diameters and a separation sampling bucket is achieved, a separation structure is adopted between a piston and a piston rod, gas in produced liquid can be sufficiently released, a telescopic universal joint connecting pipeline is adopted, the two ends have multi-direction swing connecting locking functions, the middle can stretch out and draw back, mounting isfacilitated, the borne pressure is high, the safety coefficient is large, a ball screw is adopted for reducing friction resistance, and use by an operator is facilitated.

Description

technical field [0001] The invention relates to the technical field of regularly collecting oil samples or gas samples and water samples in the oil field development process, in particular to a multifunctional oil and gas airtight sampling detection device. Background technique [0002] In the process of oilfield development, crude oil, formation water, methane, hydrogen sulfide gas, carbon dioxide gas, etc. are collected to the ground. According to relevant regulations and development plan formulation, oil samples or gas samples and water samples need to be taken regularly. [0003] (1) In the process of taking oil samples, in order to ensure the accuracy of the test data of the oil samples, when taking oil samples, the sewage bucket must be connected to the drain tank and firstly emptied from the sampling gate, and the dead oil condensed between the inner wall of the pipeline and the sampling gate must be drained. Use the sample barrel to take oil samples after seeing fres...

AI Technical Summary

Problems solved by technology

[0003] (1) In the process of taking oil samples, in order to ensure the accuracy of the test data of the oil samples, when taking oil samples, the sewage bucket must be connected to the drain tank and firstly emptied from the sampling gate, and the dead oil condensed between the inner wall of the pipeline and the sampling gate must be drained. Use the sample barrel to take oil samples after seeing fresh oil flowing out. In this way, about 0.2-0.5 kg of crude oil will be wasted for each well to discharge dead oil, which not only affects crude oil production but also causes environmental pollution. It will cause a considerable amount of crude oil to be discharged, which not only causes the loss of this part of crude oil, but also pollutes the atmospheric environment to a certain extent with the gas discharged together with the crude oil.

If the extracted product contains hydrogen sulfide gas, the contained hydrogen sulfide will be dispersed in the air, posing a huge threat to the sampling operators

[0004] (2) At present, when taking hydrogen sulfide gas samples or carbon dioxide gas samples on site, the method used is to install the sampling hose on the sampling valve, put the other end of the sampling hose into the bottom of the sample barrel, open the gate to vent, and put the The air is exhausted, and the gas at the bottom of the sample barrel is extracted with a tester for detection. The problem with this non-airtight sampling method is that it must be emptied when sampling, and the air in the sample barrel and hose is replaced, and then in the exhaust state Take samples for testing

Another is to install the sampling hose on the sampling valve, pull the other end of the sampling hose out of the well site, open the gate to vent, discharge the air in the sampling hose, and use the tester to sample the gas in the sampling hose for testing. Detection, the problem with these two non-sealed sampling methods is that it must be emptied when sampling, the air in the hose must be replaced, and then the sample is taken in the exhaust state. On the one hand, the air is mixed in the sample, and the sample is impure. On the other hand, it will cause natural gas leakage, and the contained hydrogen sulfide will be dispersed in the air, posing a threat to sampling operators and polluting the environment.

[0005] The patent No. is CN108487906A, a kind of oil well wellhead hydrogen sulfide airtight sampling and detection device and method, and this device can realize some functions, but the above-mentioned patent belongs to a fixed device, which is not easy to install, and each well requires huge welding cost. It is easy to be popularized and applied. The device we invented can also be installed conveniently and quickly at various places in the process. The function of recovery can be tested on site at the same time

Images