SU1502813A1 - Method of constructing survey and regime wells in uncohesive soil - Google Patents

Abstract

The invention relates to the mining industry and can be used in engineering geological surveys. The goal is to reduce the sanding of wells and eliminate the need to remove the sand plug. Drilling is carried out by the shock-cable method to the test interval with simultaneous fastening of the drilled space with casing pipes. After the natural level has been restored in the well, downhole is prepared by installing a gravelly cushion with a height of 0.15-0.25 m in the casing in the sampling interval. Then the filter column in the form of a blind pipe is installed with an open bottom on a previously prepared bottom hole. The space between the casing and the filter column is covered with gravel to a height of 0.2-0.5 m from the top of the gravelly pillow. The casing is then removed or raised to the desired depth, and as a result, the pad and dusting are exposed. The pumping of such a well can be done by zoning. 1 il.

Description

The invention relates to the field of the mining industry and can be used in engineering geological surveys, in particular in the equipment of observation and regime wells.

The purpose of the invention is to reduce sanding of wells and eliminate the need to remove the sand plug.

The drawing shows a technological section of the observation well.

The method is as follows.

A well in non-contiguous soil is conducted in a percussive -:; method in a simultaneous manner with simultaneous fastening of the drilled-out space by casing 1. Drilling continues up to the test interval located below the level

groundwater (GWL). In this case, the bottom hole is, as a rule, inside the casing in the sampling interval.

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After the natural water level is restored in the well, the bottom is prepared by cleaning the bottom and installing a gravelly pad 2, for which rubble is crushed (gravel possible) to equip an even layer with a height O, 15-0.25 m. After that, the pad is tamped with a shock barbell. In the presence of a sand plug in the casing string, the casing 1 is supported to the bottom of the cushion. Then, they are assembled and lowered on the guide lamps of the filter string 3, which consists of a blind pipe, and are installed with an open bottom 4 on a previously prepared bottom. The space between the casing and the filter KOLOMNAYA is covered with gravel or gravel 5 to a height of 0.2-0.5 m from the top of the rubble cushion 2. Thereafter, the casing is extracted or raised to the desired depth, resulting in a pad and spraying. Bleeding such a well can be done by zoning, i.e. without the use of additional equipment due to the low value of fil

3.4

formation resistance of the formation.

Q 5

Claims (1)

with formula of invention Q 5 A method of equipping observation and modular wells in non-interconnected soils, including drilling by a shock-cable method with simultaneous fastening of the drilled space with casing pipes and installing a filter string, in order to reduce the sand wells and eliminate the need to remove the sand plug , drilling is carried out to the interval being tested, and after the natural level has been restored in the well, the bottom hole is prepared by installing a rubble cushion with a height of 0.15-0.25 m in the casing in and sampling interval, then The filter column as a hollow tube mounted on the open bottom preformed hole bottom, and the space between the casing string and a filter gravel is filled to a height of 0.2-0.5 m. five 0 GWL ugw