Downhole control pressure casing drilling method containing formation injection pressure
A technology for injecting pressure and pressure casing, applied in drilling equipment and methods, drilling equipment, wellbore/well components, etc. problems, to shorten the drilling cycle, reduce blowout and leakage drilling accidents, and simplify the drilling process.
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[0015] The present invention is further described below:
[0016] A method for controlling pressure casing drilling for downhole containing formation injection pressure, comprising the following steps:
[0017] (1) Once drilling, once cementing, after the first cementing, drill the plug with the roller cone bit and continue to drill for a certain footage, such as 5-10m, then install the managed pressure drilling equipment and debug the managed pressure drilling equipment , pressure test, carry out joint debugging, and start construction after the test run is normal.
[0018] (2) For drilling in the non-oil zone of the second opening, select the hydraulic pressurized anti-slope tool, open and close the hydraulic pressurized anti-slope tool through the top drive, test and record the riser pressure and pump displacement during the process, so as to judge Whether the tool is normal, determine whether the tool is free and the pressure of the fluid through the tool is normal.
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