| 摘要 |
Method for cementation in a borehole 7, particularly between two formations 3, 5, by introducing a cement mortar 6, characterised in that, in order to ensure the tightness of the cementation, an aqueous solution of polyethyleneimines is added to the mortar in a quantity such that the volume of introduced polyethyleneimines is between approximately 15% and approximately 20% of the total volume of water used during the mixing of the cement. <IMAGE>
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