弱凝胶体系地层流体转向技术在海上稠油油田的应用

Application of layer fluid diversion technology of gel system in offshore heavy oilfieid

稠油油田注水开发过程中,受不利流度比和非均质性的影响,注入水沿高渗层突进,造成油井暴性水淹,严重影响水驱开发效果针对海上稠油油田的开发特点和存在问题,对弱凝胶体系的适用性进行了分析,对影响凝胶体系调驱的关键参数进行了优化结果表明,原油黏度影响弱凝胶调驱效果,随着黏度的增大调驱效果有变差趋势。在含水率40%以后,注入时机越晚,调驱效果越差。注入量越大,调驱效果越好,在实际生产过程中考虑注入能力和经济因素应采取合理的注入量。先导性弱凝胶试验的成功,为海上稠油油田的稳油控水工作指明了方向。

During the production of a heavy oilfield in Bohai bay, water cut of part of production wells goes up quickly. Analysis of the main reasons of water cut increasing shows that the high oil viscosity, poor oil-water mobility ratio and heterogeneity lead to injected water breaking through along high permeability zones, which seriously affects the water injection development performance. To solve these problems, displacement profile control of weak gel is a more effective way. For actual needs of the offshore oilfield development, the experimentation of displacement profile control of weak gel is applied in well group. Key parameters that impact flooding effect of the gel system are optimized for increasing oil production and decreasing water cut. Resuhs show that oil viscosity influences flooding effect of weak gel, as the viscosity increases, flooding effect becomes worse. In low water cut stage, the later the injectron of weak gel, the worse the flooding effect, and the greater the injection quantity, the better the flooding effect. Considering iniection capacity and economic factors, injection quantity should be reasonable in actual production process. Success of weak gel injection test points out the direction of development for offshore heavy oilfield.