迪那2凝析气田全生命开采周期纵横向出砂规律探索

Exploration of the Longitudinal and Transverse Sand Production Law in the Full Life Production Cycle of Dina 2 Condensate Field

塔里木油田迪那2凝析气田属于高温高压、低孔低渗、中—高胶结强度裂缝性砂岩气藏,具有低孔低渗特点,传统观点均认为该类型储层不存在出砂问题,但自2009年投产至今,21口井取到砂样,出砂情况普遍,已成为影响气田稳产的一个关键技术难题。为此,建立了多孔弹塑性3D出砂流固耦合模型,利用数值模拟方法,对迪那2气田开展全方位出砂量预测。研究表明:迪那2气田出砂过程可划分为少量出砂、出砂递增、出砂加剧及稳定出砂4个阶段;重度出砂区域在X-6、X-7、X-8井周围,出砂量从气田中部往四周逐步降低,重点出砂层位在库姆格列木群E_(1-2)km^(2)组。经现场实测数据验证,出砂量预测误差在15%以内,说明该出砂量预测方法具有实用性。该研究可为油田制订合理防砂对策和高效开发提供技术支持。

The Dina 2 condensate field in Tarim Oilfield is a fractured sandstone gas reservoir with characteristics such as high temperature and high pressure,low porosity and low permeability,and medium-high cementation strength,and the traditional view is that there is no sand production problem for this type of reservoir,but since the start of production in 2009,sand samples have been taken from 21 wells and the sand production is common,which has become a key technical problem affecting the stable production of the gas field.To this end,a porous elastic-plastic 3D sand production fluid-solid coupling model was established,and a numerical simulation method was adopted to carry out a full range of sand production rate prediction for the Dina 2 Gasfield.The study shows that the sand production process in Dina 2 Gasfield can be divided into four stages according to the sand production rate:small amount of sand production,incremental sand production,intensifying sand production and stable sand production;the area of heavy sand production is around Wells X-6,X-7 and X-8,and the amount of sand production gradually decreases from the middle of the gas field to the surrounding area,and the key sand production layer is located in E1-2 km^(2)Formation of Kumugeliemu Group.It was verified on the basis of the field measurement data that the prediction error of the sand production rate is within 15%,indicating the practicality of the prediction method.This study can provide technical support for the formulation of reasonable sand control measures and efficient development of the oilfield.