Illite formation damage pdf

Illite content of 1, 10, 14, and 18 wt% of the sandstone cores were used in the. In sandstone acidizing, chlorite clay mineral caused iron hydroxide precipitation inside the cores during treatment with mud acid. Illite can break down and migrates in the cores during the acid injection. Mobilization, migration, and deposition of fine particles internal or external 2. Gkay and rex 1966 firstly studied the formation damage, and concluded that the migration of smectite, illite and kaolinite particles in formation. Pdf the influence of individual clay minerals on formation damage of reservoir. Illite also may precipitate in the pores of sandstone reservoirs, impeding fluid flow. Removing formation damage and stimulation of deep illiticsandstone. It causes many problems starting from reduction of the well productivity till the whole failure of the well. The minerals discussed belong to the smectite, kaolinite, illite and chlorite. Avoiding acidinduced formation damage in aux vases reservoir. Increasing temperature enhanced the reaction rate, more calcite was.

Evidence against a separate early phase of illite formation in porelining mode includes kar dating showing that the age of north sea illites is always much. The illite clay mineral and chlorite can cause the formation damage on hcl injection. The sandstone cores used in this study contain from 1 to 18 wt% illite swellable and migratable clay mineral. Controlling formation damage caused by kaolinite clay. Effects of clay mineral and physicochemical variables. Abstract illiticsandstone reservoirs are very sensitive to hclbased fluids. Formation damage overview professor dr abdel sattar dahab petroleum engineering department cairo university 1 the. During petrophysical and petrographical analyses of the core plugs, generally, we pay close attention to the fines migration when we observe kaolinite minerals filling the pore space or lining the pores. Glda was found to be highly effective in creating wormholes over a wide range of ph 1.

Bennion,1999 described formation damage as, the impairment of the invisible, by the inevitable and uncontrollable, resulting in an indeterminate reduction of the unquantifiable. Formation damage assessment, control, and remediation. The minerals discussed belong to the smectite, kaolinite, illite and chlorite groups respectively. Formation damage in sandstones caused by clay dispersion and migration by. Pdf the influence of clay mineralogy on formation damage in. The influence of clay mineralogy on formation damage in north sea. Evaluation of formation damage and assessment of well. Formation damage is a serious problem in oil and gas industry.

Formation damage causing rockfluid interactions bennion and thomas, 1994 1. Clay minerals damage quantification in sandstone rocks using core. Illite can break down and migrates in the cores during the. Pdf formation damage in oil and natural gas reservoirs. Removing formation damage and stimulation of deep illitic. Investigation of formation damage from mud cleanout acids. The influence of individual clay minerals on formation. The conditions leading to a drastic reduction of permeability formation damage, at low temperature, by kaolinite have been documented in the literature. Since the 1960s, experts had noticed that formation damage. Formation damage is an undesirable operational and economic problem that can occur during the. Authigenic illite in the sandstone reservoirs of taiyuan.

Alteration of porous media and particle surface absorption, adsorption, wettability change, and swelling. Illite in shales is a mixture of detrital mica and its weathering products with diagenetic illite formed by reaction with pore fluids. The san1les initially contained only kaolinite and illite clays, classically classified as nonwater sensitive. Pdf the influence of individual clay minerals on formation. Clay minerals damage quantification in sandstone rocks.