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合理开采单层小油砂体极具资源接替战略意义,长期以来,因其储量规模小、钻遇率低、井网控制难度大、动用难度大、开发效益差,未能引起足够重视。随着老区储采失调矛盾日益加剧,有效开发小油砂体,使其转变为经济可采储量,形成有效的产能接替日显重要。在孤东七区西成功开采部分小油砂体工作基础上,运用数值模拟和油藏工程综合评价技术,确定了小油砂体开发技术政策,有效厚度大于1 m,含油面积大于0．02 km2,地质储量大于2．0×104t。在数值模拟和矿场实践基础上,总结出单井注水吞吐的适用条件,无边底水或边底水不活跃的封闭性小油砂体,油层亲水,地质储量大于2．0×104t,有效厚度大于3m,地面原油粘度小于2000mPa·s,空气渗透率大于500×10-3μm2。
Reasonably exploiting the single-layer small oil sands body has the strategic replacement of resources. For a long time, due to its small reserves, low drilling rate, difficulty of well control, difficulty of using and poor development benefits, it failed to attract sufficient attention. As the conflict between storage and mining in old areas becomes increasingly aggravated, the effective development of small oil sand bodies will transform them into economically recoverable reserves and the formation of an effective production succession becomes increasingly important. Based on the successful exploitation of some small oil sands bodies in the west of Gudong area, the technical policies for the development of small oil sands have been determined by numerical simulation and integrated reservoir engineering evaluation. The effective thickness is more than 1 m and the oil area is more than 0.02 km2, geological reserves greater than 2.0 × 104t. Based on the numerical simulation and mine practice, the applicable conditions of single-well water flooding and huff-and-puff-sucking are summarized. Small closed oil sands without edge water or edge-bottom water are active. The reservoir is hydrophilic and the geological reserves are more than 2.0 × 104t. The effective thickness is more than 3m, the viscosity of ground crude oil is less than 2000mPa · s, and the air permeability is more than 500 × 10-3μm2.