选择性调剖堵窜技术在稠油热采井上的应用

河南油田稠油老区由于埋藏浅、胶结疏松,纵向及平面上非均质性严重等因素,经过多年的高强度蒸汽吞吐,汽窜变得更加频繁,严重制约了油井的正常生产和开发方式的转换。选择性调剖堵窜技术通过对中低渗透层进行暂堵保护,采用耐高温高强度的封堵剂在地层深部对高渗透汽窜通道进行封堵,降低高渗层大孔道的渗透性,改善和调整吸汽剖面,最终提高采收率。现场应用表明,该技术可有效封堵汽窜大孔道,保护中低渗透层,实现堵剂在地层中的选择性封堵,并见到较好效果。对同类油藏的选择性封堵也有一定的借鉴意义。

Application of Technique of Selective Profile Control and Steam-channeling Plugging in Heavy-oil Thermal Recovery Wells

Since strengthened steam huff and puff having been carried out for years in heavy oil reservoirs with shallow buried depth,loosened cementation,serious vertical and horizontal heterogeneity of Henan Oilfield,steam channeling has increasingly influenced the normal production and development.Heat resistant plugging agent with high strength was used to improve and adjust steam-injection profile by means of temporary plugging and protecting low permeability reservoirs and decreasing the permeability,by which the recovery rate was raised.After applying the technology low permeability reservoirs were protected and high permeability reservoirs were blocked effectively and better effects were gained.It can realize selective plugging in the reservoirs and provide reference for selective plugging in similar reservoirs.