裂缝型致密油藏分段压裂水平井伤害实验研究

Staged fracturing horizontal well damage experiment in research dense fractured reservoir

红河油田长8油藏具有典型的低孔特低渗储层特点,储层孔喉细小,天然微裂缝发育,入井液易污染储层。裂缝发育区主要在断层带附近分布。红河油田长8油藏水平井在钻井、完井、压裂过程中,带入许多外来流体,外来流体通过断缝系统侵入储层易产生水锁伤害、粘土膨胀与运移伤害、沉淀堵塞伤害、压裂残渣伤害以及微裂缝发育引起压裂液大量滤失导致砂堵等多种伤害。通过对储层地质特征认识,储层伤害机理及因素分析,从而确定红河油田长8油藏伤害主要以水锁伤害为主。并提出抑制和解除水锁伤害的方法。

Honghe oilfield chang 8 reservoir has the typical characteristics of low porosity, low permeability, the reservoir pore throat size was small, natural fracture was development, injected fluid was easy to pollute the reservoir.Fracture development zone is mainly dis- tributed near the fault zone. In horizontal well drilling, well completion, fracturing process in Honghe oilfield chang 8 reservoirs. The mush invasion of fluid flow through the broken seam system which cause water locking damage, clay swelling and migration, precipitation jams damage, fracturing fluid residue damage as well as the development of micro cracks in large filtration cause sand plug and other damage. Through the understanding of reservoir geologi-cal characteristics, reservoir damage mechanism and factor analysis, determine Honghe oil- field chang 8 reservoir are mainly composed of water lock damage. And put forward inhibit and remove the water locking damage method.