The Effect of Solids Concentration and Formation Characteristics on Formation Damage and Permeability Recovery

摘要: An experimental study has been made. to investigate the effect of solids concentration and fdtcr media on fluid loss permeability recovery cores. KClpolymer muds different”barite concentrations different types core were used perform tests. Filtration tests showed that increased as concentration” in mud increased. Increasing @ids cone.en.trati~n appems improve perrneablhty when cores backfhrshecf. However, high spurt 10SS poor observed if muds.. contairiliig” polymer materials without addition solid particles. perrneabifity restoration are not orily affected by sire, shape but also pore size distribution characteristics.. Detded observation using scanning electron microscope was identify impairment at face. Therefore, reduce formation damage recovery, suitable size, must be properly selected. .. ..=,.. . .=–= References illustrations end paper. INTRO DUCT16N. .“ Forination borehole filtratiori we very importznt esp’ecially drilling completion operations. Any filtrate lost particle invasion into exposed section adjacent .yeflbo~ will a potenti@_source damage. Irr some cases fdtrate may react with me drilled cause rn&chaoi@ instabuity borehole. Damage tlom is strongly, dependent @e ~: formation, wellbore overbalance pressure. Inviiiori ..occrrrs all during drilfirrg. it possible tominimifi adding bridging material muds. Investigators I-3 have shown mat pores particles required Riitiate fiiter cake formation. This chosen matching its foirnation rock s]zes. A bridge maybe irriti&d two large stat move an opening same time lodge against each other. Other smaller paxticles openings between larger, previously If proper sizes present, this process contiriue until become too small for any contained penetrate. It only flows thrmrgh ftiter cake.