Please select the most similar patent number from A, B, C and D. Which number is?
An energy-concentrating and nest-shaped structure-forming bundle device for preventing lost circulation and reinforcing a bore wall, and application thereof in prevention of lost circulation in a karst cavity. The device comprises an outer slotted metal pipe (1) and an inner nest-shaped structure-forming explosion component. The slotted metal pipe (1) has helical slots (2) or linear slots (3) on a pipe wall thereof. The nest-shaped structure-forming explosive component is a core shaft (5) having several explosion recesses (4). Explosives are placed in the recesses (4). The slotted metal pipe (1) is sleeved and fixed on the core shaft (5). The core shaft (5) is in a loose fit with the slotted metal pipe (1). The present invention can solve the problem in which lost circulation material does not readily remain to form a support, and can improve the success rate of preventing lost circulation.
A: Provided is an esophageal stent weaving tooling and the application method thereof, wherein the tooling comprises a hollow metal tube (1) and a screw rod (201) which is sequentially sleeved with a short joint (203), a square tube (204) and a spring (205) from top to bottom in a penetrating manner, wherein the screw rod (21) penetrates through the hollow metal tube (1), one end of the spring (205) is limited by a limiting structure in the hollow metal tube (1), and the other end of the spring (205) is abutted against the end face of the square tube (204), the square tube (204) is inserted into the hollow metal tube (1), the short joint (203) and the square tube (204) are integrally formed and can slide along the screw rod (201). A distance of 2-5 mm is reserved between the short joint (203) and the hollow metal tube (1), the short joint (203) can be pressed according to weaving requirements to adjust the distance between the short joint (203) and the hollow metal tube (1), and after weaving is completed, the short joint (203) may be pressed down until the short joint (203) is tightly attached to the hollow metal tube (1) so as to conveniently take out the esophageal stent. Therefore, the supporting force of the esophageal stent may be improved, and the occurrence of breakage or filament breakage is avoided. The tooling is particularly suitable for degradable esophageal stents, ensuring the quality and efficiency for weaving the esophageal stents.
B: A plugging method, applied to a mid-deep strata geothermal well (6), and comprising: removing soil of a leakage area, and adding backfill soil and compacting same to form a backfill soil layer (4); drilling at leakage points of the leakage area to form at least one grouting hole (9) and at least one exhaust hole (5); inserting a grouting pipe (10) into the grouting hole, and injecting a plugging material to a position below the backfill soil layer by means of the grouting pipe; plugging the exhaust hole, and injecting a plugging material to be the position below the backfill soil layer again; and standing for a preset time to complete the plugging. The plugging material is injected by adopting a low-pressure method, the operation is simple, and the leakage points are plugged more effectively by injecting the plugging material twice.
C: A hoop stake for gardening, comprising: a metal tube (1); and a plastic layer (2) coated on an outer wall of the metal tube (1). The metal tube (1) is a U-shaped tube. A first end portion and a second end portion of the metal tube (1) are respectively provided with a male connector (3) and a female connector (4), or are each provided with a male connector (3), or are each provided with a female connector (4). The female connector (4) comprises a first connection portion (41) in a hollow cylindrical shape and an engagement sleeve (42), wherein the first connection portion (41) is coaxial with the metal tube (1) and has an internal thread provided on an inner wall thereof, and the engagement sleeve (42) is fixedly connected to the first connection portion (41). The male connector (3) comprises a second connection portion in a cylindrical shape and an engagement connector (31), wherein the second connection portion is coaxial with the metal tube (1) and has an external thread (32) provided on an outer wall thereof and matching the internal thread, and the engagement connector (31) is located at a tail end of the external thread (32) and fixedly connected to the second connection portion. It is possible to connect two separate hoop stakes and boost connection strength therebetween.
D: Disclosed is a metal inner cavity magnetic abrasive finishing device, comprising an outer frame (1), wherein an electric motor (2) is fixedly connected to the bottom of an inner cavity of the outer frame (1); a rotary disk (3) is fixedly connected to an output shaft of the electric motor (2); a magnetic disk (4) is fixedly connected to either side of the surface of the rotary disk (3); a sleeve (5) is fixedly connected to either side of the inner cavity of the outer frame (1); an inner cavity of the sleeve (5) is fixedly connected to a first reset spring (6); the side of the first reset spring (6) away from the inner cavity of the sleeve (5) is fixedly connected to a movable rod (7); the side of the movable rod (7) away from the first reset spring (6) is fixedly connected to a sleeving pipe (8); an inner cavity of the sleeving pipe (8) is clamped with a metal pipe body (9); and a magnetic abrasive body (10) is arranged in an inner cavity of the metal pipe body (9). According to the finishing device, the metal pipe body is clamped, fixed and polished, and the finishing efficiency thereof is thus improved.
Answer: B