Well washing valve capable of achieving forward and reverse circulating well washing

Abstract

The invention discloses a well washing valve capable of achieving forward and reverse circulating well washing. The well washing valve comprises an upper joint portion and a lower joint portion connected to the lower portion of the upper joint portion in a sleeved manner. A hollow cavity axially penetrating through the top and the bottom of the upper joint portion is arranged on the upper joint portion. A mounting cavity axially penetrating through the top and the bottom of the lower joint portion is arranged on the lower joint portion. The mounting cavity communicates with the hollow cavity.A valve body is mounted in the mounting cavity and is provided with a valve cavity axially penetrating through the top and the bottom of the valve body, and the valve cavity communicates with the mounting cavity. A valve plate is arranged at the top of the valve body. The valve plate can be opened or closed, and therefore the valve cavity and the mounting cavity communicate or are blocked. A valvecontrol device is further mounted in the mounting cavity and is mounted on the upper portion of the valve plate, and the valve control device can open the valve plate. According to the well washing valve, forward circulating well washing can be achieved, and under the normal well pressure, pressure or fluid in a well is blocked; when the pressure in the well reaches a certain value, reverse circulating well washing can be achieved; and in the processes of forward and reverse circulating well washing, normal downhole work is not influenced.

Description

technical field [0001] The invention relates to the technical field of downhole tools used in oil fields, in particular to a well flushing valve capable of realizing positive and negative circulation well flushing. Background technique [0002] Oil well cleaning is one of the important tasks in the daily management of the oil production team, in order to reduce and remove the wax and scale of the downhole tubing, clean the inner wall of the tubing, improve the flow conditions of the wellbore, and increase the oil production efficiency; the well cleaning operations include positive flushing and reverse flushing There are two different basic methods. The flushing fluid enters from the tubing and returns from the casing when the well is being flushed, and the opposite is true for backwashing. The fluid enters from the casing and returns from the tubing. The flushing valve is a commonly used downhole valve. It can not only ensure the smooth flow of the normal oil outlet channel ...

AI Technical Summary

Problems solved by technology

[0002] Oil well flushing is one of the important tasks in the daily management of the oil production team, in order to reduce and remove the wax and scale of the downhole tubing, clean the inner wall of the tubing, improve the flow conditions of the wellbore, and increase the oil production efficiency; the well flushing operations include positive flushing and reverse flushing There are two different basic methods. When flushing the well, the flushing fluid enters from the tubing and returns from the casing. In reverse flushing, the fluid enters from the casing and returns from the tubing. The flushing valve is a commonly used downhole valve. It can not only ensure the smoothness of the normal oil outlet channel during oil well production, but also provide the well flushing fluid channel for well flushing during well flushing operations. There are two types of well flushing valves, and it is necessary to determine which type of well flushing valve to install according to the well flushing method determined by the oil well. After the well flushing valve is installed, the oil well can only use the corresponding well flushing method for the well flushing operation; The two well-flushing methods have their own characteristics, and the choice of the specific well-flushing method needs to be determined according to different well-flushing purposes and considering the actual production conditions of various aspects. The cleaning needs of tubing may require both backwashing and positive flushing. Correspondingly, conventional single-function backwashing valves or positive flushing valves cannot meet the requirements. This production requirement

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