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UDC 628.112.23:628.147.22
Karmalov A. I., Filimonova S. V.
Analysis of Сauses of Colmatage and Corrosion of Water-Intake Well Equipment under Conditions of Increased Anthropogenic Load
Summary
In the course of operation of water intakes from underground sources the problems associated with the processes of fouling and corrosion of the metal equipment of artesian wells inevitably increase. The intensity of deposit formation and corrosion development on the well equipment depends on the well output, the chemical composition of ground water, the presence of methane-producing and other bacteria generating an extremely active corrosion medium. Monitoring of the chemical composition and microbiological analysis of ground water make it possible to identify the causes of colmatage and corrosion of metal-containing elements of the wells under the conditions of the increased anthropogenic load, which further facilitates the selection of methods of struggle against these phenomena.
Key words
monitoring , ground water , artesian well , colmatage , corrosion , anthropogenic load , bacteria , microbiological analysis
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UDC 628.112.2
Tsymbalov A. A.
Overhaul period of water well rehabilitation
Summary
Annual construction of water wells, operation and maintenance of newly step-out wells built as back as in the Soviet era demands arranging up-to-date engineering service of these assets. Therefore, the development of advanced methods of well repair in Russia has been a critical task. Based on the regional experience it is shown that maintaining the well flow rate in the process of operation is provided by routine maintenance works. The main factor for repair and maintenance works is incrustation of the filtering well part that affects the safe yield and reduces the well flow rate. In order to maintain the design capacity a new source shall be developed or special repair works shall be carried out to restore the original capacity. The well recovery expenditures can make 25–30% of the cost of a new water intake construction. The right choice of the repair method and overhaul period determines the service time and life cycle of the well. On the basis of the regional practice the approaches to solving the well decolmatation problem are formulated. The overhaul period for the rehabilitation of colmatated wells are recommended.
Key words
water well , colmatage , rehabilitation methods , repair and rehabilitation operations , overhaul period , well life cycle
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UDC 628.112.22:628.147.22
Karmalov A. I., Filimonova S. V.
Methods of Struggle with Consequences of Colmatage and Corrosion of Water-Intake Well Equipment
Summary
The main problems encountered in the process of operation of water-intake wells are corrosion of water-lifting equipment and development of colmatage processes in the filters and in the zones of aquifers near the filters and, as consequence, decrease in output. One of the most acceptable variants of solving this problem is the use of glass-plastic pipes and polymeric filters. The experience in the use of up-to-date non-corrosive materials, the regeneration of wells using the reagent method making it possible to increase their output and to prolong the operation time is considered.
Key words
artesian well , colmatage , hydrogeochemical conditions , non-corrosive materials , chemical method of regeneration
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UDC 628.112.24
Melnikova T. V., Didenko V. G., Yurkiv N. I.
Developing biopolymer drilling mud for water supply well construction
Summary
The results of experimental studies of the effect that different drilling mud compositions produce on the colmatage of a bottom-hole zone are presented. The studies aimed at developing process liquids that preserve the reservoir properties and ensure environmentally safe construction and operation of water supply wells. The use of traditional slurries causes pollution of both the reservoir and bottom-hole zone. The efficient stabilization of the reservoir properties is ensured by the use of non-dispersing biopolymer drilling mud with the addition of acid-soluble sealant that prevents the invasion of filtrate and drilling mud into reservoir, bottom-hole zone, and preserves at most their collecting properties (for 70–80%).
Key words
water well , colmatage , bottom-hole zone , reservoir properties , permeability , drilling mud
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