河南油田95℃油藏用聚合物评价与应用

Evaluation and Application of Polymer in 95?C Reservoir in Henan Oilfield

摘要: 为保证河南油田VII1-3层系高温油藏聚合物驱先导试验的成功，项目在室内系统评价了聚合物性能及聚合物与油藏配伍性能。配制水质、溶液中溶解氧含量、剪切、高温老化等都影响高温聚合物溶液粘度。特别是溶液中溶解氧含量对聚合物粘度长期热稳定性影响显著。氧含量对水解度影响不大。溶解氧含量小于0.5 mg/L条件下，聚合物在95℃高温下老化90天后，结构具有一定的稳定性，拉伸流变稳定性和剪切流变稳定性，老化180 d后粘度保留率可达到80%以上。渗透率为油藏渗透率0.587 μm2，聚合物浓度在1000 - 2000 mg/L范围内，具有较好的注入性。进入矿场应用后，聚合物现场注入性良好，已取得明显的增油降水效果。

Abstract: In order to ensure the success of polymer flooding pilot test in Henan oilfield VII1-3 formation high temperature reservoir, a lot of tests are researched about the performances of the polymer and its compatibility with the reservoir in the laboratory. These factors influence on the viscosity of polymer solution including water quality, dissolved oxygen content in waste water, shearing, high temperature aging, etc. Especially the dissolved oxygen content in the solution has a great effect on the long-term thermal stability of polymer viscosity. Oxygen content has a little effect on the degree of hydrolysis of polymer. When the dissolved oxygen content is less than 0.5 mg/L, the structure, tensile rheological and shear rheological performance has certain stability in 95˚C high temperature aging 90 days. Aging viscosity retention rate can reach more than 80% after 180 days. It has a good injection within the range 1000 - 2000 mg/L of polymer concentration, when the permeability is 0.587 μm2 of the reservoir. After entering the field application, the polymer injection is good. It has obvious effect of enhanced production of oil and water cut.