One-way valve and automatic intermittent pumping system and method with one-way valve

Abstract

The invention provides a one-way valve and an automatic intermittent pumping system and method with the one-way valve. The one-way valve comprises an upper connector, a valve cover, a middle connectorand a lower connector which are coaxially connected in a screwed mode in sequence. The upper connector, the valve cover, the middle connector and the lower connector are coaxially connected in a screwed mode to form a revolving body structure with an axial hollow channel, and oil liquid flows through the axial hollow channel of the hollow revolving body. A valve seat, a valve element and a protective sleeve are arranged in the axial hollow channel, wherein the head of the valve element can be in contact with the valve seat in a setting mode, the tail of the valve element is fixedly connectedto one end of a reset spring, the other end of the reset spring is fixedly connected with an electromagnet, and the electromagnet is arranged in the protective sleeve. The electrified electromagnet slides in the protective sleeve and drives the valve element to be set or away from the valve seat through the reset spring, so that the axial hollow channel is in a blocked state or a smooth state. Thereset spring can control the opening pressure of the one-way valve, so that the opening pressure is kept within a small range, and flow change and even back pressure backflow caused by overlarge opening pressure are avoided.

Description

technical field [0001] The invention belongs to the field of oilfield exploitation, and in particular relates to a one-way valve and an automatic interval pumping system and method including the one-way valve. Background technique [0002] In recent years, in order to meet the coordination of supply and drainage of oil wells and improve the lifting efficiency of rod pumps, intermittent production of pumping units has become an important production method, but the following problems exist in intermittent production: (1) Most of the oil wells on site are not equipped with return valves, There is a risk of liquid backfilling the wellbore in the inter-opening well, and there are certain safety hazards; (2) The existing one-way valve is not suitable for automatic inter-pumping wells, and impurities in the valve cavity are easy to settle and accumulate during use, causing one-way The valve is not closed tightly, and the spring is easily damaged, resulting in failure of the one-way...

AI Technical Summary

Problems solved by technology

[0002] In recent years, in order to meet the coordination of supply and drainage of oil wells and improve the lifting efficiency of rod pumps, intermittent production of pumping units has become an important production method, but the following problems exist in intermittent production: (1) Most of the oil wells on site are not equipped with return valves, There is a risk of liquid backfilling the wellbore in the inter-opening well, and there are certain safety hazards; (2) The existing one-way valve is not suitable for automatic inter-pumping wells, and impurities in the valve cavity are easy to settle and accumulate during use, causing one-way The valve is not closed tightly, and the spring is easily damaged, which leads to the failure of the one-way valve

[0003] The above problems have restricted the popularization and application of inter-well opening technology, so it is urgent to develop a special check valve device for opening wells between pumping units. Since the check valve is not installed at the head of the automatic inter-pumping well, the following problems were found during the operation site: When the well is opened and shut down, part of the well fluid in the oil well is poured back into the wellbore under the action of back pressure, causing the pumping unit to work repeatedly; when the serious leakage well is opened and shut down in between, the backflow of the well fluid will cause serious problems such as backflow to the formation

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