SU953123A1 - Filtration chute - Google Patents

Description

(54) FILTRATION TRAY

one

The invention relates to exploration and can be used for research on filter models used to equip hydrogeological wells.

A known installation for the investigation of anti-sand filters, including a perforated cylinder, which simulates a bottom hole, a slurry pump for supplying liquid with sand, a sump for sand separation and a hydrocyclone 1.

The disadvantages of the known device are relatively narrow field of research and the inability to simulate the actual conditions of the filters in the wells.

The closest in technical essence to the present invention is a filtering tray, comprising a housing with a water supply pipe, a body cover, a bottom with a central opening communicated with a water drain pipe, with a filter and a perforated partition inside the housing.

A sump is installed in the tray for sedimentation of sand that seeps through the filter. Piezometric sensors are installed in the bottom of the tray to measure the loss of water pressure in the area adjacent to the filter. The flow rate of water flowing through the filter is measured by a flow meter. According to the measured values of head loss, flow rate and duration of sand falling into the sump, the quality of the filter operation in well 2 is judged. However, this tray does not accurately simulate the filter operation conditions in the well. Thus, it is known that an aquifer finds 10 s under powerful rock pressure with which sand is compacted, and the difference in permeability between compacted and loose sand in the sand-filter zone is approximately 70%. Another factor has a similar effect. In the process of drilling hydrogeological wells, clay J (or other) solutions are used to strengthen the walls of the wells from creeping. When this occurs, the rocks are clayed along the well radius at

Claims (2)

1. USSR author's certificate number 162480, cl. E 21 B 43/02, 1964. 2.Bashkatov D.N., Rogovoy V.L. Drilling of wells for water. M., 1976 (prototype).