Reson of sand production on drinking wells Islamshahr town
Subject Areas :
محمود Salari
1
(استادیار دانشگاه آزاد اسلامی واحد پرند)
مجتبی Sayadi
2
(رئیس گروه تحقیقات آبفار استان تهران)
Keywords: Sand production, Islamshahr, pumping, fine grain, sediments texture,
Abstract :
Sand production is defined as the extraction of amounts of fine grain sand and silt while drilling andexploitations of wells. This phenomenon has resulted in quantity, quality, engineering, and environmentalproblems within parts of the country. The villages of Islamshahr province are among such regions withinthe country which have been facing this problem in recent years. The goal of this study is to introduce thisissue and to explore the reasons, and quantify sand production in 10 fresh water wells within the villages ofIslamshahrprovince. In this respect, according to the measurements made within five consecutive cycles ina day(starting point, one, four, eight, and twelve hours) using well head facilities from 1stBahman 1389untillAban 1390, during which it was proved that HassanabadKhalese, Malekabad, and Shatereh villageslocated in the southern part of the province do exhibit fine grain sediments which as with the start ofpumping and after 4 hours, the sand production reduces ; however after 12 hours of the starting point, sandproduction increases. Although within the northern, and north western regions of Islamshahr province (forinstance Ahmadabad Mostofi, FiroozBahram, and Goldasteh,…) which exhibit coarse sediments, as thestarting point and after four hours, sand production deemed to be major while after 12 hours of pumping ,this amount decreases. Therefore it is recommended to reduce sand production by use of the natural welldevelopments based on proper leaching, pumping tests using controlled motor cycles, artificialdevelopment including the implementation of sandy gravel pack, and double gravel pack, along with duallayering of wells, and application of polymer pipes, and sieving filters.
