Method for improving cement quality of cement-formation interfaces of deep wells
The invention discloses a method for improving the cement quality of cement-formation interfaces of deep wells. The method comprises the steps of 1, injecting first mud cake curing agents into oil-gas wells; 2, injecting second mud cake curing agents into the oil-gas wells for making direct contact...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | The invention discloses a method for improving the cement quality of cement-formation interfaces of deep wells. The method comprises the steps of 1, injecting first mud cake curing agents into oil-gas wells; 2, injecting second mud cake curing agents into the oil-gas wells for making direct contact with the first mud cake curing agents in the step 1; 3, injecting cement paste into the oil-gas wells for making direct contact with the second mud cake curing agents in the step 2. According to the invention, mud cake curing and interface cross-linking can be achieved without modifying drilling fluid or changing the condition of cement paste, the cement quality and strength of the cement-formation interfaces can be remarkably improved, cake-curing formation agents are not needed, the requirement of the cement-formation interfaces of the deep wells with the depth larger than 5000 m can be met, the good anti-fluid-channeling function and interlayer isolation ability can be achieved even under the condition that temperature is higher than 105 DEG C, and the acid fracturing requirement can be met. |
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