Sand prevention filtering device suitable for geothermal well

Abstract

The invention discloses a sand prevention filtering device suitable for a geothermal well, which comprises a conducting assembly, the conducting assembly comprises a first through pipe, a second through pipe and a filtering pipe, the filtering pipe is coaxially positioned between the first through pipe and the second through pipe, and the two ends of the filtering pipe are respectively connected with the first through pipe and the second through pipe through flange plates; the sand prevention filtering device also comprises a sand prevention assembly which comprises a first-stage filter barrel and a second-stage filter cover, the first-stage filter barrel is coaxially arranged in the filter pipe and rotationally connected with the inner wall of the filter pipe in the filter pipe, and the second-stage filter cover is circumferentially arranged on the outer wall of the first-stage filter barrel and connected with the inner wall of the filter pipe; and according to the invention, the filtering pipe is additionally arranged in the pipeline, particle sediment can be effectively filtered when underground well petroleum is collected, the sand prevention filtering device can be detached when carried and transported, and installation is easy and convenient.

Description

technical field [0001] The invention relates to the technical field of underground well filtering, in particular to a sand control filtering device suitable for geothermal wells. Background technique [0002] Among the geothermal wells that have been used in my country, due to geological and construction reasons, many wells have relatively high sand content, some as high as 1 / 200,000, and the maximum particle size is more than 1.5mm. And because of the severe sand production in geothermal wells, the wellbore and pipelines will be eroded and corroded by sand, which will cause expensive expenses and shorten the service life of most water heaters. When the inlet velocity is high enough, some sand particles will be carried to the wellhead, and the high-speed sand-containing gas will cause strong erosion and abrasion to the wellbore and wellhead surface equipment. According to statistics, since 2000, the economic loss caused by erosion in my country has reached more than 70 bill...

AI Technical Summary

Problems solved by technology

Similarly, in most of the geothermal wells that have been invested in production, due to the erosion and wear of the casing by the medium, and the sand content in the geothermal water exceeds the standard, the heating pipe network is blocked and the normal heating is affected. occur

According to on-site production research, about 64% of the production accidents of casing failure and damage occurred on the thread of the casing connection. Due to the local sudden expansion, eddy currents are generated and gravel is easy to accumulate. When the water inlet velocity is not large enough, Sand particles cannot be carried out of the wellhead, and will settle and accumulate at the bottom of the well, causing serious safety accidents such as sand plugging

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