砾石充填是国内外疏松砂岩油气藏广泛采用的确保油气井正常生产的主流防砂技术。为进一步提高该技术的应用效果,在储层损害机理分析基础上,利用某油田S区块疏松砂岩油藏储层岩样,采用控制变量法开展了砾石充填防砂室内实验,对生产压差、储层含水量和砾石粒径3个关键因素对防砂效果的影响规律进行分析研究。结果表明,250~425 μm砾石在各种工况下均表现出最优的综合性能:有效渗透速度达到0.499~1.317 cm/s,渗透伤比控制在5.3%~23.1%内,堵塞面积比仅为25.3%。现场应用验证了该技术的有效性,产油量较预期提高15%,含砂率控制在0.03%以下。研究成果为疏松砂岩油气藏砾石充填防砂设计优化提供了依据。

Gravel packing is a mainstream sand control technology widely used in unconsolidated sandstone oil and gas reservoirs worldwide to ensure normal production of oil and gas wells. To further improve the application effectiveness of this technology, laboratory experiments on gravel packing sand control were conducted using the controlled variable method on reservoir rock samples from an unconsolidated sandstone reservoir in Block S of a certain oilfield, based on the analysis of reservoir damage mechanisms. The influences of three key factors—production pressure differential, reservoir water content, and gravel particle size—on sand control effectiveness were analyzed. Results show that 250~425 mesh gravel exhibited the best overall performance under various operating conditions: effective permeation velocity reached 0.499~1.317 cm/s, permeability damage ratio was controlled within 5.3%~23.1%, and plugging area ratio was only 25.3%. Field application has verified the effectiveness of this technology, with oil production increased by 15% compared to expectations and sand content controlled below 0.03%. The research results provide a basis for optimizing gravel packing sand control design in unconsolidated sandstone reservoirs.