浅析钻井液静结构力对裂缝油气藏的损害

Damage of drilling fluid static structural force to fractured pool

井漏是多裂缝地层钻井作业中经常发生的复杂情况之一。含高固相的钻井液漏入地层 ,必然对油气层产生损害。在诸多损害因素中 ,含高固相的钻井液进入裂缝因凝胶强度形成的静结构阻力 ,将对油气的产出发生力学阻塞 ,可影响到油气藏的发现 ,给试油和开发工作带来不利因素 ,造成裂缝性油气藏的主要损害。控制地层钻井液漏失量 ,降低井漏中钻井液的静切应力 ,有利于减小井漏对裂缝油气藏的损害。

Lost circulation is often happened during drilling in multi -fracture formation .If high solid drilling fluid leaks into formation ,it should damage reservoir .For high solid drilling fluids go into fracture ,static structural resistance force formed by gel strength will produce mechanical locking to oil/gas output ,and affect the discovery of reservoir.It is unfavourable to oil production test and development job .In order to decrease damage to fractured pool during lost circulation ,fluid leaked volume of drilling fluid must control ,and gel strength of drilling fluid must reduce.