钻井液侵入对储层电性物性影响实验研究

An Experiment on the Effect of Drilling Fluid Invasion on Reservoir Electrical and Petrophysical Properties.

在正压差钻井过程中，钻井液中的固相颗粒和液相不可避免地侵入地层，改变井筒附近储层流体分布的原始状态，并可能导致地层损害。目前吐哈油田在钻井过程中广泛使用屏蔽式暂堵技术，即在钻井液中加入各种充填颗粒，在近井壁带形成一个防止滤液侵入的暂堵带或屏蔽环，从而达到保护储层的目的。但这种钻井液侵入油层后引起的电性。

During overbalanced drilling, solid grains and liquid in the drilling fluid will inevitably penetrate the formation, causing changes of the original state of reservoir fluid distribution around the well bore, and probably resulting in formation damage. Currently, shielded temporary blocking technique is widely used in Tu Ha oil field, that is, to add various filling grains in the drilling fluid so as to form a temporary blocking zone or a shielding ring around the borehole to prevent filtered fluid from invasion, hence protecting the reservoir. But the formation electrical and petrophysical changes caused by drilling fluid invasion as well as the relation between drilling fluid invasion depth and the degree of formation damage are still an unresolved problem.