Quantitative constant-current continuous-feeding anti-scale and anti-separation device for closed wellhead

Abstract

The invention relates to a quantitative constant-current continuous-feeding anti-scale and anti-separation device for a closed wellhead. The quantitative constant-current continuous-feeding anti-scale and anti-separation device is arranged between a liquid inlet pipe casing pipe and a chemical storage tank, and comprises a casing pressure balance valve, a casing pipe gate valve, a constant-current feeding machine, a flow calibrating valve, a quick feeding valve and a dual-position anti-scale valve, wherein the constant-current feeding machine comprises a constant-current feeding valve and a constant-current device, and is externally connected with an electric control box. The quantitative constant-current continuous-feeding anti-scale and anti-separation device completely changes the traditional feeding mode and has the benefits that the casing pressure is balanced, the device is sealed and insulated, the external environment temperature resistance is high, and the feeding amount can be adjusted as needed through the constant-current control. The anti-scale and anti-corrosion chemical agents are added in oil and an annular space of the casing pipe so as to avoid the damage of various mediums in stratum on underground equipment. The quantitative constant-current continuous-feeding anti-scale and anti-separation device is simple in structure, low in production cost and long in service life.

Description

technical field [0001] The invention relates to a protection device for downhole equipment in an oil well, in particular to an anti-scaling and anti-scaling anti-separation device for quantitative constant current continuous dosing of medicine at a closed wellhead. Background technique [0002] Due to the complexity of the stratum structure, the damage of various harmful media to downhole equipment in oil wells is becoming more and more serious. Oilfields need to replace a large number of downhole equipment due to corrosion and scaling, and the equipment and operation costs are particularly huge. And it is the sleeve that hurts the most, because the sleeve cannot be replaced. If there is a problem with the casing, it needs to be overhauled or the oil well is scrapped, and the loss is particularly huge. However, the previous dosing device could not achieve airtight dosing, quantitative constant flow dosing, or continuous dosing. The pollution to the environment, the waste ...

AI Technical Summary

Problems solved by technology

Oilfields need to replace a large number of downhole equipment due to corrosion and scaling, and the equipment and operation costs are particularly huge

And the most serious damage is the sleeve, because the sleeve is not replaceable

If there is a problem with the casing, it needs to be overhauled or the oil well is scrapped, and the loss is particularly huge

However, the previous dosing device could not achieve airtight dosing, quantitative constant flow dosing, or continuous dosing

Pollution to the environment, waste of liquid medicine, and seasonal changes are uncontrollable

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