Abstract
Deterioration of bottomhole formation zone permeability is caused by mechanical pollution of porous medium, swelling of cement at its contact with water and accumulation of paraffin in low formation temperature deposits. In the process of oil production all extracted formation fluid: oil, water and gas pass through bottomhole zones of production wells and all water injected into formations – through the wellbore zone of injection wells. These processes occur at temperatures and pressures other than those at which these fluids (or gases) were originally on the surface or in the formation. As a result, different hydrocarbon components (asphalt-resin deposits) and different salts that fall out of the solutions as a result of thermodynamic equilibrium disorder can deposit in the wellbore zone, as in the filter. The choice of the impact method is based on the careful study of thermodynamic conditions and state of the wellbore zone, composition of rocks and fluids, as well as systematic study of accumulated production experience in this field.
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