2 results about "Workover" patented technology

The invention discloses an underground plugging device and an under-pressure sucker rod and oil pipe lifting workover operation technology. A sealing convex seat with a sealing surface and a position limiting lug boss are arranged in an oil string; a rod pump is arranged in the part, positioned above the sealed convex seat, in the oil string in a matched way; the sealing surface of a sealing lug boss arranged on the rod pump is matched with the sealing surface of the sealing convex seat arranged in the oil string; an outer oil inlet hole is formed in the part, positioned below the position limiting lug boss, of the pipe wall of the oil string; an inner pipe is arranged in the section of oil string in a matched way; an inner oil inlet hole corresponding to the outer oil inlet hole of the oil string is formed in the pipe wall of the inner pipe; a sealing groove is formed in the part, positioned below the inner oil inlet hole of the inner pipe, of the pipe wall of the inner pipe; a sealing ring matched with the inner wall of the oil string in a matched way is arranged in the sealing groove; the upper end of the inner pipe is connected with the rod pump through a connecting-tripping device; and a pipe orifice formed in the lower end of the oil string is sealed. The structure is simple and reasonable; the performance is reliable; under-pressure sucker rod and oil pipe lifting workover operation can be realized; the underground pressure can be conveniently plugged for many times; and the safe, efficient, environment-friendly and energy-saving production can be realized.

The invention discloses a casing coupling reverse buckling device, and belongs to the field of workover operation. The casing coupling reverse buckling device comprises a shaft body, a clamping body and a locking piece, wherein the shaft body is of a tubular structure; the shaft body is axially movably sleeved with the clamping body; the outer diameter of the lower part of the shaft body graduallyincreases from top to bottom; the lower part of the clamping body is used for being in threaded connection with the upper part of a casing coupling; when the locking piece is screwed down to enable the shaft body to axially move upwards, the clamping body is deformed by radially outward pressure and clamped on the upper part of the casing coupling; and the locking piece sleeves the shaft body ina threaded mode and is used for locking the clamping body on the shaft body after the lower part of the clamping body deforms. The casing coupling reverse buckling device can tightly clamp a casing without being lowered into the casing, and the phenomenon that a casing fishing tool gets stuck while being lowered is avoided. In addition, the casing coupling reverse buckling device provides an innerchannel for lowering an oil pipe, a tool can be lowered to fix the casing at the lower part of a reverse buckling point if the casing allows, and the accuracy of reverse buckling is effectively improved.