Etude Et Suivi Des Forages Hydrauliques Dans La Région De Ghardaïa

Résumé: Study and monitoring of hydraulic drilling in the Ghardaia region The region of Ghardaïa is located in the south of the Algerian, its surface is of the order of 84 660.12 km2, with a population of 451.456 inhabitants. The region is part of the northern Sahara aquifer system (SASS) characterized by the superposition of two aquifers (the continental intercalary and the complex terminal). The drilling of hydraulic boreholes in the Ghardaia region goes through several stages, depending on the depth and pressure of the water table. For deep drilling (> 1000 m), the operation involves laying the guide tube with cementing, then laying a column of casing with cementing, followed by the installation of a production column with cementation and end the installation of a collection column consisting of a strainer type Johnson with intercalations of solid tube (when the strainer is long), of the settling tube at the base and reserve tube at the top. For the drilling of medium and shallow depths, two cementing phases are carried out for the laying of the guide tube and the laying of the production column, before the installation of a capture column. The introduction of the filtering mass to be carried out only when the sheet is not gushing, if it is the case one to set up packer without setting up filtering mass. The drilling operation will terminate by disgorging and developing wells to remove fine particulates and performing pumping tests to determine the operating flow.

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