Water injection automatic filtering and backwashing device

Abstract

The invention discloses a water injection automatic filtering and backwashing device, and relates to the technical field of oil extraction. One side of a shell is connected with a water outlet pipe through a hoop, the inner end face of the shell is hermetically connected with a filter cartridge, and the other side of the filter cartridge is hermetically connected with the hoop. The upper and lowerparts of the shell are communicated with bypass pipes; an inner hole of the bypass pipe at the upper part is in clearance fit connection with a backwashing piston, a spring is arranged at the upper part of the backwashing piston, the bypass pipe at the lower part is in clearance fit connection with a filtering piston, and a spring is arranged at the lower part of the filtering piston. The devicehas the following beneficial effects that through arrangement of the backwashing piston and the filtering piston and by utilizing a pressure difference change inside and outside the filter cartridge,the purpose of automatic backwashing is achieved; the water quality index of injected liquid is ensured, manual operation is not needed, and an injection process is uninterrupted; liquid flowing intoa communicating pipe is filtered through a grid gasket so that impurities are prevented from entering a piston cavity and causing movement clamping stagnation of the piston; and the requirements for different water injection pressures can be met by arranging an adjusting screw to adjust the pre-tightening degree of the springs and changing the pressure difference value between the upper portion and the lower portion of the pistons.

Description

Technical field: [0001] The invention relates to the technical field of oil extraction, in particular to a water injection automatic filtering and backwashing device. Background technique: [0002] Oilfield water injection wells are equipped with wellhead filters at the wellhead. As the last water quality guarantee measure before injection, the wellhead filter needs to be opened for a period of time to clean the filter cartridge to prevent clogging of the filter cartridge and ensure the water quality index of the injected water. Manual tour is required Monitoring the pressure change of the wellhead filter, there are human factors that lead to problems such as the inability to guarantee the quality of the water injection, the large amount of cleaning labor, and the intermittent water injection. Summary of the invention: [0003] In order to solve the above-mentioned problems, the present invention provides an automatic filtering and backwashing device for water injection. [0004] T...

AI Technical Summary

Problems solved by technology

[0002] Oilfield water injection wells are equipped with a wellhead filter at the wellhead. As the last water quality assurance measure before injection, the wellhead filter needs to be opened and cleaned after a period of filtration to prevent the filter cartridge from clogging and to ensure the water quality of the injected water. Manual inspection is required. Monitor the pressure change of the wellhead filter, there are human factors that lead to problems such as unguaranteed injection water quality, heavy cleaning labor, and intermittent water injection

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