Abstract: Targeted at the geologic characteristics of deep and ultra-deep wells at the southern margin of Xinjiang Oilfield,this paper expounds the main technical difficulties of cementing,especially the technical problems in respect of cement slurry technology,and proposes solutions. On this basis,an ultra-high temperature and ultra-high density cement slurry with the temperature up to 200 ℃,density up to 2.70 g/cm³,and all performance indicators meeting the requirements of cementing technology was designed. Thus,the technical problems existing with ultra-high density cement slurry when being applied in ultra-high environment,such as poor stability,poor rheological property,slow-to-function compressive strength and poor compatibility,have been solved. This system has been successfully applied to blocks at the southern margin of Xinjiang Oilfield.

Key words: ultra-high temperature, ultra-high density, cement slurry, deep well, oil displacement spacer

摘要： 针对新疆油田南缘深井、超深井的一些地质特点,阐述了固井的主要技术难点,重点从水泥浆技术方面提出了技术难题和解决措施。运用颗粒级配原理,通过大量的室内实验,选取粒径合适的加重材料和充填材料,并确定合适的加量,设计出最高密度范围2.70 g/cm³、最高温度200 ℃,各项性能满足固井技术需求的超高温超高密度水泥浆,解决了超高密度水泥浆在超高温环境下稳定性差、浆体流变性差、抗压强度发挥慢、难相容等技术难题。该体系在新疆油田南缘区块上已成功使用。

关键词: 超高温, 超高密度, 水泥浆, 深井, 驱油隔离液