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华北钻进的一批古潜山油藏深探井,其中有一部分是用大庆Ⅰ—Ⅱ型钻机打的4000～4500深井,因而深并固井工艺技术问题也就越来越突出。近三年多来,我部固3500米的井有39井次,最深井达5011米,其中有7″先期完成固井及7″和5″尾管固井,固井合格率达95％。通过39井次深井固井实践,认为有四方面的工艺技术问题需要考虑。
A number of deep buried wells in North China drilled deep exploration wells, of which some are Daqing Ⅰ-Ⅱ drilling rig hit 4000 ~ 4500 deep wells, and thus deep well cementing technology problems will become more and more prominent. In the recent three years, 39 mines and 3,500 m deep wells have been drilled in 3,500 m. Among them, 7 “cementing completed in advance and 7” and 5 "tail pipe cementing have achieved a cementing pass rate of 95% Through 39 well deep well cementing practices, it is considered that there are four aspects of the technical problems to be considered.