新疆砾岩油藏三元复合驱色谱分离现象研究

Chromatographic Separation of Components of ASP Flooding System for Conglomerate Reservoir in Xinjiang Oil Fields

采用充填克拉玛依七中区克下组砾岩油藏去油砂、渗透率0．92～1．26μm^2、直径1．8cm、长120和90crn的6个物理模型，在常温下注入0．4、0．6、0．8Pv三元复合驱替液（12g／L碳酸钠＋3．0g／L石油磺酸盐KPS＋1．2g／L抗盐聚合物KY2500），再注水5PV，定时测定流出液中碱、石油磺酸盐、聚合物浓度，绘制3种化学剂产出相对浓度C／C0～注入量曲线，列表给出3种化学剂的突破时间和C／Cn=0．1时聚-碱、碱-表、聚-表产出时间差（均以流出液体积PV为单位）。结果表明该三元驱替液在填砂管中渗流时发生了色谱分离，聚合物先突破，碱随后突破，表面活性剂最后突破，产出时间差表明石油磺酸盐与聚合物、碱的色谱分离程度较严重，因此降低石油磺酸盐在地层中的损耗是减缓三元复合驱替液色谱分离的主要途径。在较长的填砂管中，渗流距离较长，色谱分离程度较严重；增大注入段塞尺寸可减小色谱分离程度。图6表2参9。

An ASP combinational flooding solution composed of 12 g/L sodium carbonate, 3.0 g/L petroleum sulfonate KPS, and 1.2 g/L polymer KY2500 and of slug size 0.4, 0.6, and 0.8 PV is injected into and flow through deoiled conglomerate sand packs of permeability 0.92-1.26μm2 and 1.8 cm in diameter and 120 or 90 cm long with 5.0 PV of flooding water followed. The conglomerate sand is taken from oil reservoir of KL Formation, central district 7, Karamay. the concentration of sodium carbonate, petroleum sulfonate, and polymer in effluent of 6 sand packs is measured at regular intervals. For every chemical, curves of relative concentration, C/C0, vz volume of effluent in PVs are oanstructed and breakthrough point, or starting point of production, and relative production lag of one chemicl to another at C/C0 = 0.1 are tabulated. As shown by the experimental results that chromatographic separation of ingredient chemicals does occur in ASP solution flowing throguh the conglomerate sand packs and the polymer starts to produce early, followed by the alkaline, with the petroleum sulfonate produced more lately; the relative production lag determined indicates more serious chromatophic separation of the petroleum sulfonate from the polymer and the alkaline, which means that the main way to reduce the chromatophic separation in ASP flooding solution is to lower down the consumption of pelroleum sulfonate in reservoir formations. In longer sand packs the flow path is longer and thus the chromatographic separation is more serious.