聚合物驱用复合离子调剖剂HN-3性能研究

Study on Properties of Complex Ion Profile Control Agent HN-3 for Polymer Flooding

为了抑制聚合物驱过程中聚合物的窜流,研制了一种用于河南油田聚合物驱技术的复合离子调剖剂HN-3（由400数800 mg/L复合离子聚合物ZN930和40数80 mg/L有机铬交联剂DT862组成）,考察了ZN930与聚合物驱用聚合物的配伍性和成胶性差异,研究了ZN930浓度、DT862浓度和剪切等因素对成胶性能的影响,以及HN-3在多孔介质中的注入性和封堵性。结果表明,ZN930与聚合物驱单元用聚合物配伍性好,混合后油藏温度下（50℃）放置90 d未发生分层或沉淀,且老化后的黏度略高于混合初始黏度;同等聚合物浓度下成胶性能优于相当或略高相对分子质量的部分水解聚丙烯酰胺（HPAM）;油藏条件下浓度为400数800 mg/L的ZN930和40数80 mg/L的DT862复配能形成性能良好的凝胶并在180 d以上不破胶,说明调剖剂成胶后具有良好的稳定性;随着注入速率的增加,交联体系初始黏度和成胶黏度均有不同程度的下降,且成胶时间有所延长;当注入速率达1200 m L/h时,剪切后的体系几乎不能成胶,故在现场应用中应尽量控制地面设备对交联体系的剪切。与相同浓度（1000 mg/L）的聚合物3630S、MO-4000、1285溶液相比,在相同注入速率下HN-3具有良好的注入性,且在多孔介质中封堵效率大于90%,成胶黏度40数1500 m Pa·s可控。

In order to prevent the polymer solutions from channeling during polymer flooding, a profile control agent HN-3 used in polymer flooding technology in Henan oilfield, consisted of 400-800 mg/L multifunctional ionic Polymer ZN930 and 40-80 mg/ L organic chromium cross-linking agent DT862, was prepared. The compatibility between the ZN930 and polymers used in Henan oilfield was studied, the effect of ZN932 concentration, DT862 concentration and shear action on the gelling performance was investigated, and the injecting and plugging ability of the HN-3 in porous media was evaluated. The experimental results showed that the compatibility between the ZN930 and polymers used in polymer flooding units was good. No seperation or precipitation occurred to after being placed for 90 days at reservoir temperature of 50℃, moreover, the viscosity of the aged system was slightly higher than the initial viscosity. Gelling properties of multifunctional ionic polymer was superior to partially hydrolyzed polyacrylamide with the same or slightly higher molecular weight in the case of the same polymer consumption. At the reservoir condition, good gel could be obtained after mixing ZN930 of 400-800 mg/L with DT862 of 40-80 mg/L, and the gel did not break within 180 d, which indicated that the system after gelling had excellent stability. With the increase of the injection speed, the initial viscosity and the gelling viscosity decreased and the gelling time prolonged, especially at the speed of 1200 mL/h, the system after sheared hardly form the gel, hence, the shear of ground equipment on the system should be controlled. Under the same injection rate, compared to the polymer 3630S,MO-4000, 1285 solutions at the same concentration of 1000 mg/L, the HN-3 had a favorable injection, high plugging ratio （〉90%） and controllable strength （ 40-1500 mPa. s）.