The use of casing made of unplasticised PVC in the construction of water wells

Summary

The data on the practical experience of using pipes made of unplasticised PVC in the construction of water wells by the example of «AkvaStroiMontazh» Company is presented. The background of the emerging technology, problems in the introduction, the economic effect gained and other advantages are described. The use of casing made of unplasticised PVC in the construction of water wells facilitates work intensification, well cost reduction etc. Different patterns of technical and engineering factors influencing borehole curving (e.g., the dependence on the number of rolling cutters or bit blades) were defined. To prevent borehole curving special attention should be paid to the value of drilling bit weight and control of the rotation speed. These parameters are of prime importance for the drilling efficiency. Increasing the boring speed is the most evident method of well cost reduction. The experience of «AkvaStroiMontazh» Company proves the growth of using casing made of unplasticised PVC in water well construction in Russia. The innovative technology of well boring has a great potential and numerous advantages.

Key words

water well , drilling mud , casing made of unplasticised PVC , borehole curving , rolling drilling bit

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