研究认为，这种电位异常是注水开发过程中，注水井与生产井之间形成的过滤电场引起的。
It is considered that this abnormal potential is caused by electrofiltration field formed between water injection Wells and produced Wells in the process of waterflood development.
针对水平井成井特点，结合大量室内试验，研制了双壁预充陶粒携砾过滤器。
Aimed at the characteristic of horizontal well, combined with large amount of laboratory tests, double-wall pre-packed gravel screen is developed.
论述了水井井周渗透性降低的原因，从钻井方法、冲洗液性能、建立人工过滤层、洗井等方面探讨了改善渗透性的措施。
Measures to improve perrne- ability reduction are discussed in terms of the drilling method, fluid properties, artificial infiltration layer, and well flushing, etc.
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