Downhole flow channel type pressure control device, downhole pressure management drilling system and drilling method thereof
A managed pressure drilling and flow channel technology, which is applied in wellbore/well components, earthwork drilling, flushing wellbore, etc., can solve the problems of unseen systems or devices, save drilling time, reduce leakage, reduce The Effect of Drilling Costs
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[0043] In order to make the technical solutions and advantages of the present invention clearer, the exemplary embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, and are not exhaustive of all the embodiments. And in the case of no conflict, the embodiments and the features in the embodiments of the present invention can be combined with each other.
[0044] image 3 The wellbore pressure comparison chart of the traditional managed pressure drilling method and the wellbore pressure of the downhole managed pressure drilling method of the present invention is shown. exist image 3 middle:
[0045] p L For the lower limit pressure curve of safe drilling fluid density, the larger value between collapse pressure and formation pore pressure is usually taken;
[0046] p H For the upper limit pressure curve o...
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