高含水油藏黏弹性颗粒深部调剖剂研制与应用OA

Aiming at the challenges of conventional plugging agents to penetrate deep into the reservoir or deteriorat-ing stability in harsh geological conditions,dibenzylmethane diisocyanate(MDI)and polyester polyol are selected to synthesize a block-type polymer material with alternating arrangement of flexible segments-rigid segments,form-ing viscoelastic-particle deep profile control agent after granulation processing.In conditions of temperature of 120℃and salinity of 2.0×105 mg/L,tests are carried out before and after 5-days constant temperature.The elemen-tal analysis shows that the contents of C,H and N in plugging material are basically the same,with complete parti-cle structure and excellent temperature and salt resistance performance.The results of core plugging experiments show that,for millimeter-scale viscoelastic particle with particle size-pore throat diameter ratio of 5-30,the core plugging rate is>99.0%.For micron-scale viscoelastic particle with particle size-pore throat ratio of 1.5-14.5,the core plugging rate is>93.0%,indicating good plugging effect.Deep profile control tests of viscoelastic body in 4 well patterns of Wei 5 block in northern Jiangsu Basin demonstrate a cumulative oil production increase of 1 073 tons in each stage,with significant and sustained oil production increasing and water decreasing effects.Both labo-ratory research and field test show that the viscoelastic-particle deep profile control agent can be effectively applied to profile control of high water-cut reservoirs,showing promising application prospect.