Dual-gradient well-drilling system and well-drilling method thereof
A dual-gradient drilling pump technology, which is applied to the automatic control system of drilling, drilling equipment, underwater drilling, etc., can solve the problems of complex deep-sea drilling environment, drilling equipment and methods that are difficult to overcome, and achieve short well construction time and low cost. cost, adaptable effect
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Embodiment 1
[0047] Embodiment 1, as shown in 2, the dual-gradient drilling system is applied to offshore drilling without risers. A dual-gradient drilling system includes a drilling pump set 1, a top drive 2, an auxiliary pump device 3, a data monitoring and control system 4, a top drive adaptation device 5, a rotary blowout device 6, a conventional blowout preventer set 7, and casing 8 , Double-walled drill pipe 9, conversion short 10, conventional drilling tool 11 and drill bit 12. The double-walled drill rod 9 is composed of a concentric inner drill rod 91 and an outer drill rod 90, an annular gap B17 is formed between the inner drill rod 91 and the outer drill rod 90, and the inside of the inner drill rod 91 forms a channel A18; the annular gap B17 is used for The first fluid is delivered to the bottom of the well, and the hole A18 is the first fluid return channel; the top drive adapter device 5 is a rotary joint installed between the top drive 2 and the double-wall drill pipe 9, and...
Embodiment 2
[0051] Example 2, such as figure 1 As shown, the dual-gradient drilling system is applied to offshore drilling with risers. Dual-gradient drilling system, including drilling pump set 1, top drive 2, auxiliary pump device 3, data monitoring and control system 4, top drive adapter device 5, riser 20, conventional blowout preventer set 7, casing 8, double wall Drill pipe 9, conversion short 10, conventional drilling tool 11 and drill bit 12. The auxiliary pump device 3 communicates with the upper part of the riser 20 through the pipeline, thereby communicating with the annulus A14, so the annulus A14 also includes the annulus formed by the downhole drilling assembly and the riser 20, and the rest of the implementation content is the same as that of the first embodiment.
[0052] In Embodiment 1 and Embodiment 2, the second fluid in the annular gap A14 forms an annular liquid column, and the lower end 16 of the annular liquid column of the second fluid is located at the upper par...
Embodiment 3
[0053] Embodiment 3, a kind of dual-gradient drilling method, comprises the following steps:
[0054] The double-walled drill pipe 9 extends into the borehole, the upper part is connected to the top drive adapter 5, and the lower part is connected to the conversion short 10; the lower part of the conversion short 10 is connected to the conventional drilling tool 11 and the drill bit 12; The conventional drilling tool 11 and the drill bit 12 constitute a downhole drilling tool assembly; an annular gap A14 is formed between the downhole drilling tool assembly and the borehole;
[0055] Drilling pump unit 1 injects the first fluid through top drive 2, top drive adapter channel B50, double-wall drill pipe annulus B17, conversion shorting channel E101, conventional drilling tool 11 and drill bit 12, and enters annulus A14; annulus The first fluid returned by A14 passes through the short-circuit hole D100, the double-wall drill pipe hole A18, and the top drive adapter hole C51, and ...
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