二类油藏油井压裂措施研究

二类油藏较一类油藏渗透率低、孔隙度不高、砂体发育厚度小、储层物性差,但仍具有一定的开发潜力。为提高二类油藏聚驱采出程度,对其实施压裂措施,以达到油田稳产目标。对压裂井进行产能预测是压裂后油井经济评价的重要因素,同时也为现场油井压裂设计和施工奠定基础。将二类油藏细分为主力油层和薄差油层,分别对这两类油层不同时期(含水下降期、含水稳定期以及含水上升初期)进行压裂,以优选出主力油层与薄差油层最佳的压裂时期,为现场实施压裂增产提供依据。

Study on Oil Well Fracturing Measures of the Second Class Reservoir

Compared with the first class reservoir, the second class reservoir has low permeability, low porosity and sandbody thickness and poor reservoir physical property, but it still has certain development potential. To improve the degree of polymer flooding in the second class reservoir, the fracturing measures are always used to achieve stable production target of oilfield. Predicting the productivity of fractured well is the important factor of economic evaluation for oil well;it also lays the foundation for the design and construction of the oil well fracturing. In this paper, the second class reservoirs were subdivided into main reservoirs and thin poor reservoirs, it’s pointed out that the two types of reservoirs should be fractured in different periods (water cut decline period, water cut stable period and the initial water cut increase period), the best fracturing period should be selected for main reservoirs and thin poor reservoirs.