南海西部油田表层高渗地层固井技术

A Well Cementation Technique in High Permeability Formation of Southwest China Sea Oilfield

在南海西部油田涠洲地区的钻井作业中,经常在较浅井段钻遇一些砂砾岩、粗砂岩地层,这些地层胶结性差、地层疏松破碎、渗透率高,且岩层厚度大,导致固井过程中水泥浆失水量过大、失去流动性,给作业带来了诸多危害。针对南海西部油田的涠洲11-2-XX井注侧钻水泥塞时水泥浆失去闪凝而困住钻杆导致井眼报废的情况,总结该井的现场情况,分析水泥浆闪凝的原因,研制了一种新型的降失水剂。将该产品应用于邻井的固井作业中,应用效果良好。

When drilling in weizhou region of Southwest China Sea Oilfield, operators could find some glutenite, grouan formation in suprastructure. The formation is weak bonding, loose, tattered, high permeability and heavy layer, therefore, the cement setting is often ahead of time, the quick setting accident may product a lot of inconven- ience to operators. This article depictes the example that cement slurry is quick setting to beset the drill pipe, and causes the hole abandon when cement side track in weizhoul 1 - 2 - XX well, analyzes the reason of quick setting, and then researches a new filtrate reducer. Utilizing this produce to adjacent well, this fact indicates the production is available.