The invention provides a well cementation method and a well cementation device The device comprises a drill pipe, an inserting head, an inserting type float collar and a casing pipe; one end of the drill pipe is connected with the inserting head, the other end of the drill pipe is used for injecting cement paste, the inserting head is inserted into the inserting type float collar, and a back pressure valve device is arranged in the inserting type float collar; the drill pipe is arranged in the casing pipe in a sleeved mode, a first annular space is formed between the outer wall of the casing pipe and the well wall; the back pressure valve device of the inserting type float collar is used for preventing the cement paste from flowing back to the casing pipe after the drill pipe is pulled out from the casing pipe In the well cementation process, the cement paste injected from the drill pipe is pressed into the first annular space formed by the well wall and the casing pipe to enable drilling mud in the first annular space to flow over, so that only the cement paste in the space, formed in the pipe, of the drill pipe is needed to be replaced when follow-up mud replacement is performed, therefore, the mud replacement amount is small, and the continuity of well cementation is guaranteed Meanwhile, the mud replacement amount is small, therefore, the clear water using amount is small, the replaced waste mud amount is small, water resources are saved, and pollution to the environment is little In addition, the mud replacement time is shortened, the oil consumption is reduced, and manpower is saved

Well cementation method and well cementation device

The utility model discloses a float collar provided with a shut-in valve. A shut-in valve structure is additionally arranged on an original float collar. An annular supporting disc is arranged on a circular bead on the upper side of a float collar body. The inner edge of the annular supporting disc is fixedly connected with an outer cylinder. The lower end of the outer cylinder is provided with a bottom, and the bottom of the outer cylinder is suspended above a choke ring. The upper end of the outer cylinder is fixed to the inner edge of the supporting disc, and the top of the outer cylinder is flush with the supporting disc. The side wall of the outer cylinder is provided with at least one row of outer cylinder flowing holes in the circumferential direction. A sliding sleeve which makes close contact with the inner wall of the outer cylinder and can be suspended on the inner side of the outer cylinder in the mode of sliding upwards and downwards is inserted in the inner side of the outer cylinder. The top of the sliding sleeve is higher than the supporting disc. The cylindrical wall of the sliding sleeve is provided with at least one row of sliding sleeve flowing holes, wherein the sliding sleeve flowing holes and the outer cylinder flowing holes are identical in hole diameter and hole pitch and are communicated. Before pressure bumping, cementing fluid flows as passing through an original float collar structure; during pressure bumping, a rubber plug presses downwards and closes the shut-in valve, so a cement paste flowing channel is blocked; even if a float collar non-return device fails, the rubber plug can still effectively prevent the fluid from flowing reversely and plays a role in double guarantee.

Float collar provided with shut-in valve

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Float collar provided with shut-in valve