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The invention discloses a double-bucket type solid-liquid separator and a separation method. The double-bucket type solid-liquid separator comprises a guide rail, a pressing plate, an extruding deviceand charging buckets, wherein the extruding device is located above the guide rail; the charging buckets are slidably connected with the guide rail; after the charging buckets slide along the guide rail, the pressing plate can align at or be staggered with the openings of the charging buckets along the movement direction of the pressing plate; the two charging buckets are arranged and comprise inner buckets and outer buckets; the inner buckets are sleeved in the outer buckets; solid-liquid separation holes are formed in the bucket walls of the inner buckets; gaps are arranged between the outer walls of the inner buckets and the inner walls of the outer buckets; the outer buckets are provided with drainage pipes; the drainage pipes communicate with the inner spaces of the outer buckets; and valves are rotatably connected onto the drainage pipes and are used for manually rotatably controlling the opening and the closing of the drainage pipes. The double-bucket type solid-liquid separator and the separation method have the advantages that the to-be-waiting time or the waiting time is shortened during the feeding, squeezing and discharging processes, so that the working efficiency isimproved.

A retractable horizontal oil well packer comprises a left joint and a right joint. The left joint is connected with a piston sleeve, the center of the left joint is fixedly communicated with a center tube, the wall of the center tube is provided with a liquid inlet hole, and the outer diameter of the liquid inlet hole is sequentially provided with a piston cylinder, a drum type basket extension cylinder and a pull base in a sliding and sleeved mode and is rotatably provided with a left rotation puller in a sleeved mode; the piston cylinder is matched with the piston sleeve in a sliding and sealed mode; the drum type basket extension cylinder is sleeved with a sealant cylinder, and the two ends of the sealant cylinder are connected with the piston cylinder and the pull base respectively; the left rotation puller and the pull base are assembled and then fixedly connected through a cover ring, the inner diameter of the end where the left rotation puller is connected with the pull base is movably connected with left rotation threads on the outer diameter of the center tube, the left rotation puller is arranged in the inner diameter of the right joint in a sliding and sleeved mode, a guide groove in the left rotation puller is matched with a guide column on the right joint in a sliding mode, and the center of the right joint is in threaded connection with the outer diameter of the center tube. By means of hydraulic pressure rising, the structure capable of rotating and retracting enables the extension spring type sealant cylinder to restore an initial state after pressure rising, the fracturing and well sticking rate is low, service life is long, and oil production efficiency is greatly improved.