BH油田储层保护技术现场应用效果评价研究

Application evaluation of formation protection techniques in BH oilfield

关键词:  储层保护  完井液  压井液  射孔液  黏土矿物构成  储层敏感性 

Key words:  formation protection  completion fluid  kill-fluid  perforating fluid  clay mineral form  reservoir sensitivity

摘要:

BH油田储层黏土矿物构成分析及储层敏感性实验表明,BH油田储层伤害类型主要为外来固相颗粒堵塞及油井结垢,要求各种入井流体(完井液、压井液、射孔液)必须为无固相或低固相流体,且流体滤失或漏失量低、与地层及地层流体配伍好。对BH油田在用各种完井液、压井液或射孔液使用效果及对储层保护效果分析表明,BH油田大批量使用的完井液(聚磺钻井液+2%(w)～3%(w)油溶性暂堵剂)可满足储层保护需要,所用压井液或射孔液应以清水+0.5%(w)～1%(w)黏土稳定剂+0.2%(w)增稠剂为主,当地层压力系数<1时,可加入1%(w)~3%(w)的油溶性暂堵剂防止压井液向地层大量漏失。 

Abstract:

Reservoir clay mineral form analysis and reservoir sensitivity experiments showed that the plugging of extrinsic solid-phase particle and scaling in oil-well were main reservoir damage types in BH oilfield. All kinds of fluid in the well, such as completion fluid, kill-fluid and perforating fluid should be free solid or low solid fluid with low filter loss or leakage and good compatibility with formation and formation fluid. Formation protection effectiveness of all kinds of using completion fluid, kill-fluid and perforating fluid indicated that the completion fluid(polymer sulfonated drilling fluid + 2%～3% oil soluble temporary plugging agent) used largely can meet the need of reservoir protection, and kill-fluid or perforating fluid are composed of free water, 0.5%～1% clay stabilizer and 0.2% thickening agent, when formation pressure coefficient is less than 1,1%~3% oil soluble temporary plugging agent should be added to prevent loss of pressure well liquid to formation.