Causes of destruction and instability of deep water wells of Kohgilouyeh

Subject Areas :

KH SHafiei-Motlagh ¹ , A.R Salemian ² , A.A Afshin ³

1 - مربی گروه عمران دانشگاه آزاد اسلامی واحد دهدشت
2 - مربی گروه عمران دانشگاه آزاد اسلامی واحد دهدشت
3 - مربی گروه عمران دانشگاه آزاد اسلامی واحد دهدشت

Received: 2016-08-26 Accepted : 2016-08-26 Published : 2014-03-21

Keywords: Kohgiluyeh, Problems of water wells, Destruction and instability, Fouling,

Abstract :

Today, the most applied way to access underground in Iran and the world is digging water wells. Inaddition to exploit advantages, pumping wells have always have several problems such as degradationand instability of their structure, reducing the discharge, forming masses of sand clogging and loss ofequipment. According to current statistics, 60% of deep wells drilled in the Kohgiluyeh have a shelf lifeless than 4 years. The high costs of drilling deep wells and geological sensitivity and degradation andsuccessive failure of wells, deep wells need to study about effective life and affective Factors on wellsdestruction and preventive methods and appropriate utilization of wells would be inevitable. A sample of18 wells in the area was used for chemical analysis and preparing and grading tests. Laboratory and fieldstudies and available information, the main causes of destruction and instability of wells in the studiedzone were detected as poor design of wells, thin layers of granulated in saturated layer, use of screenswith inappropriate size and pores and excessive removal and fouling.