SANDSTONE DIAGENESIS AND FORMATION DAMAGE PREVENTION IN SHENGLI OILDOM
SANDSTONE DIAGENESIS AND FORMATION DAMAGE PREVENTION IN SHENGLI OILDOM
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发表时间：
2001
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通讯作者：
Cai Jin
中科院分区：
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作者：
Cai Jin
胜利油田砂岩油藏埋藏成岩带不同，其储集空间、成岩矿物储层特征及敏感矿物分布也发生变化。从而导致潜在地层损害的差异。浅层砂岩油藏的潜在地层损害模式包括粘土膨胀和出砂问题。预防地层损害的方法有机械防砂、临时筛管措施和使用抗粘土膨胀剂等。粘土稳定剂和抗粘土膨胀剂可分别用于防止中层砂岩储层中的粘土细运移和粘土膨胀，该储层可能遭受多种地层损害，主要包括固体颗粒封堵和无机垢。深层砂岩油藏此类地层防害措施主要采用稳定剂、临时筛管、铁螯合剂、酸压裂等。同一深度砂岩的潜在地层伤害随沉积环境、成岩演化和储层特征的不同而不同。此类地层的防损方法应根据地层情况选择，以最小的成本获得最大的经济效果。
The reservoir spaces, reservoir characteristics of diagenetic minerals and the distribution of sensitive minerals are changable according to burial diagenesis belts of sandstone reservoir in Shengli oildom. It leads to the differences of latent formation damage. The latent formation damage pattern of shallow seated sandstone reservoir includes clay swelling and sand flow problem. The prevention methods for formation damage are mechanical sand control, temporary screen blocking measures and using anti clay swelling agent. Clay stabilizer and anti clay swelling agent can be used respectively for preventing clay fine migration and clay swelling in middle seated sandstone reservoir which may suffer to many formation damages, mainly including solid grain shutoff and inorganic scale. The main measures for damage prevention of this type of formations in deeply seated sandstone reservoir can use stubilizer, temporary screen blocking, iron chelating agent and acids for fracturing. The latent formation damage of sandstone in the same depth varyies with the sedimentary environments, diagenetic evolution and reservoir characteristics. Methods selected for damage prevention of this type of formation should be in accordance with formation situation to obtain the maximum economic results with minimum costs.