RU1819988C - Device for preparation of well filter for water - Google Patents

Abstract

Use: for preparing water well filters for testing, in particular washing a filter column of a rotary drilled well using a mud solution. SUMMARY OF THE INVENTION: A device for developing a water well filter includes a housing with a vertical channel for pumping liquid or gas from the surface and with a horizontal branch, which is made in the form of a continuous annular diffuser orifice. The gap area may be either constant or decreasing to the periphery. Rinsing is carried out using air and an additional supply of clean water to the filter column and is maintained during annular flushing - pumping the level in the filter column above the static level by 1.5 - 3 cm, and the wining is combined with pumping and carried out at the maximum position. 2 ill. Ј

Description

The invention relates to the field of preparing well water filters for testing, in particular, cleaning sand well openings from well filter. .

It is known to flush a well filter in which water is supplied through drill pipes, a check valve in the sump tube and in the space between the filter pipe string and the borehole wall covered with clay cake and flows to the surface of the earth 1.

The disadvantage of the method is that only the outer surface of the filter is washed.

It is known to flush (purge) a well filter with a hydraulic ruff made of a perforated nozzle equipped with rubber cuffs on top and bottom. When flushing (purging), the brush rises and falls within the entire length of the working part of the filter 2.

The disadvantage of this device is that water enters the filter in the form of separate jets, making it difficult to flush all openings of the filter. The washing of this device is carried out until the clay solution is completely removed from the annulus and the clay cake is destroyed. Time00

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In this case, crust destruction occurs locally in the oide of individual spots of times-j wash, separated from each other. During subsequent pumping, water enters the filter through these spots at an increased speed compared to the rate that occurs with the same flow rate of the well, in the absence of clay cake in the filter zone. An increase in speed leads to an increase in resistance in the zones of erosion spots and thereby reduces the specific production rate of such other wells.

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housing core, 2 - housing restrictive ring connected to core 1 by threaded connection, 3 - horizontal end outlet channel - gap between core 1 and ring 2, 4 - vertical annular cavity, hydraulically connected to outlet channel 3 and nozzle 5 for feeding under high pressure air or water, 6 - axial through hole in the core of the housing with the upper pipe 7 for supplying water below the housing through the pipe 8,

Closest to the invention 9 - additional through hole 20

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A device is provided comprising a housing with an axial through hole for supplying liquid to the filter region below the housing and a vertical peripheral hole connected to a peripheral annular horizontal rectangular cross-section by a gap in the body of the housing for supplying high pressure liquid or gas to the filter openings and inlet nozzles mounted in the upper parts of the axial through and vertical peripheral openings for connection to pressure pipelines.

The disadvantages of the device are the return of liquid or gas enriched in sandy-clay particles due to the filter space above the housing inside the filter and clogging of the filter holes with sand particles, as well as the velocity of the liquid or gas directly at the exit of the annular horizontal gap, requiring increased pressure in the pressure head piping and increase the time required to completely clean the filter openings.

The aim of the invention is to improve the quality of cleaning filter openings from sand and clay particles and to reduce cleaning time by making an additional through hole in the housing for passing liquid from the filter region below the housing to the filter region above the housing and the annular cavity hydraulically connected to an outlet channel and a vertical peripheral hole, wherein the annular cross-sectional areas of the horizontal annular gap are reduced to the periphery.

Figure 1 shows a vertical section of the device; figure 2 is a top view, where 1 is the air-water supply40

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water for transferring water from the area of the same housing to the area above the housing, 10 - an oil seal in the body of housing 1 and ring 2.

The end gap 3 between the core 1 and the ring 2 in the direction from the cavity to the periphery has a decreasing area in this direction, which ensures the formation of an annular water or air flow, which has a slightly increasing speed towards the periphery, which ensures water suction at the outlet of the diffuser cavity due to the speed effect, which ensures the release of holes from sand particles, erosion of clay particles adhering to the surface, and the release of the surface of holes from water-repellent properties , Complete degradation (peeling) of the mudcake.

The use of clean water for cleaning the filter openings is most effective in the presence of pressure, self-draining water, air - in the presence of aquifers with a static level that does not reach the surface of the earth.

Before the annular washing is carried out, the clay solution in the filter column is replaced with pure water.

Example. Use for cleaning filter openings with air for a well drilled by a rotary method and equipped with a strainer in flooded sands. When connecting to the pipe 7 and pipe 5 air supply pipes. The casing 1 and the ring 2 are installed in the sump and the clay solution in the filter column is replaced with clean water. After that, simultaneously with the supply of clean water to the water pipes and the lifting of the casing, airg 9 is supplied - an additional through hole0

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water transfer from the area below the body to the area above the body, 10 - an oil seal in the body of body 1 and ring 2.

The end gap 3 between the core 1 and the ring 2 in the direction from the cavity to the periphery has an area decreasing in this direction, which ensures the formation of an annular water or air flow having a slightly increasing speed towards the periphery, which ensures water suction at the exit from the diffuser cavity due to a speed effect, which ensures that the holes are free of sand particles, erosion of clay particles adhering to the surface, and the surface of the holes are free from water repellent dishes, complete destruction (peeling) of the clay crust.

The use of clean water for cleaning the filter openings is most effective in the presence of pressure, self-draining water, air - in the presence of aquifers with a static level that does not reach the surface of the earth.

Before annular washing is carried out, the clay solution in the filter column is replaced with pure water.

Example. Use for cleaning filter openings with air for a well drilled by a rotary method and equipped with a strainer in flooded sands. The air supply pipes are connected to the pipe 7 and pipe 5. The housing 1 and the ring 2 are installed in the sump and the clay solution in the filter column is replaced with clean water. After that, simultaneously with the supply of clean water to the water pipes and the lifting of the casing, air is supplied from the compressor through the nozzle 5, the cavity, the outlet channel 3 and the filter openings into the filter space with the exit of the water-air, sandy-clay mixture to the earth's surface. After the removal of sand and clay particles has ceased, the transition to pumping and subsequent pumping of the well.

Claims (1)

The claims A device for developing a water well filter, comprising a housing with an axial through passage for supplying liquid to the filter region below the housing with a vertical peripheral hole in communication with an outlet channel made in the form of a horizontal annular gap for supplying high pressure liquid or gas on the walls of the filter, and inlet pipes installed in the upper parts of the axial through channel and a vertical peripheral hole for connection to pressure pipelines, characterized in that, in order to improve the quality of cleaning the filter holes from Q of sand and clay particles and reduce cleaning time, an additional vertical through channel is made in the housing for bypassing liquid from the filter area below the housing to the filter region above the housing and the annular cavity hydraulically connected to the outlet channel and the vertical peripheral hole, while the annular cross-sectional areas of the horizontal annular gap decrease to the periphery. Yes//./ .fi.G /