涩北二号气田疏松砂岩出砂规律分析

Analysis of the sanding production laws of the unconsolidated sand in Sebei-2 gas field

涩北二号气田是柴达木盆地大型生物气田,岩性疏松,岩石弱胶结,存在砂泥岩层频繁间互沉积。在开发过程中,出砂井较多,沉砂速度快,出砂严重。本文以生产动态数据为基础,对气田出砂特征及沉砂速度变化规律进行了研究,依据储层物性特征研究,结合现场生产数据,对涩北二号气田出砂井进行分类,对影响出砂的因素进行分析,为下一步气田主动控砂防砂及气藏稳产奠定了基础。

Sebei-2 gas field is a quaternary biogenic gas reservoir, characterized with unconsolidated formation, lower gel strength and the sand-shale interactive deposition in vertical. The more sandy wells and increasing sand pro- duction rate indicate that the condition of sand production is serious during the process of development. The charac- teristics of sand production and the law of sand sediment velocity change were studied based on the dynamic pro- duction data, the sanding wells were classified according to the physical property and field production data of the reservoir, and the factors caused sand production were analyzed in order to lay a good foundation for further sand prevention and stable yields of the reservoir.