研究泥浆固相侵入岩芯深度的分段截割法

A NEW METHOD OF DETERMINING DEPTH OF INVASION BY DRILLING MUD SOLIDS

本文提出了利用渗透率测定仪检测泥浆固相颗粒侵入岩芯深度的方法——分段截割法。用该方法测定了不同条件下泥浆固相颗粒侵入岩芯的深度,研究了影响岩芯渗透率的主要因素,并评价了室内配出的完井液对岩芯渗透率的影响。试验结果说明,加有合适桥堵剂的完井液对低渗岩芯渗透率的损害主要是由滤液引起。在钻经储层的过程中,尽量缩短泥浆浸泡时间。

A method for determining the depth of invasion by drilling solids from permeability measurement is proposed in this paper. The method, called cut off successive slices of core sample, is quite quick and simple. The invasion depths of core under various conditions were measured to study the main factors affecting core permeability. Impairment of core sample caused by completion fluid prepared in the laboratory was evaluated. The results show that permeability impairment of a'low permeability core sample id caused by the filtrate from completion fluid with proper bridging agent.