Full-size fishing spear for pipe drops in oil-water well and fishing method thereof

Abstract

The invention belongs to the technical field of oil field borehole operation fishing tools, and particularly relates to a full-size fishing spear for pipe drops in an oil-water well and a fishing method thereof. The full-size fishing spear comprises a connector, a first level spear rod, a second level spear rod and a third level spear rod; and the connector, the first level spear rod, the second level spear rod and the third level spear rod are sequentially connected from top to bottom. of the three levels of spear rods of different sizes are combined, and the fishing range is Phi 46 mm-65 mm,and is obviously greater than that of Phi of 59 mm-65 mm of a common sliding block fishing spear. The spear rods of the sliding block fishing spears with different diameters are connected together bythreads from small to large, so that the fishing range is greater, and the spear rods are adapted according to the size of the inner diameters of the drops; and compared with the common sliding blockfishing spear, the contact area of a sliding block slip and the oil pipe wall is increased by about one time, so that the pressure on an oil pipe is effectively reduced, and the rupture risk of the wall of the oil pipe to be fished is reduced.

Description

technical field [0001] The invention belongs to the technical field of fishing tools for downhole operations in oil fields, and in particular relates to a full-size fishing spear and a fishing method for falling objects in oil and water wells. Background technique [0002] In oil and water well fishing operations, tools such as slider fishing spears and male cones are often used to fish pipe falling objects, but there are many problems in use. [0003] The advantage of using the male cone for fishing is that it can be used in a wide range, and it can be used to make buckles and fish for pipes with different inner diameters; the disadvantage is that the buckle is also undercut when making buckles, and it is very easy to turn the fallen things into loose parts. . [0004] The advantage of using slider fishing spears is that the fishing reliability is strong, and generally the falling objects in the well will not be poured into pieces; the disadvantage is that due to the limit...

AI Technical Summary

Problems solved by technology

[0003] The advantage of using the male cone for fishing is that it can be used in a wide range, and it can be used to make buckles and fish for pipes with different inner diameters; the disadvantage is that the buckle is also undercut when making buckles, and it is very easy to turn the fallen things into loose parts.

[0004] The advantage of using the slider fishing spear for fishing is that the fishing reliability is strong, and generally the falling objects in the well will not be poured into pieces; the disadvantage is that due to the limitation of the size of the spear shaft, the fishing range is small.

[0005] In addition, due to the unknown data such as the type and inner diameter of the falling objects in the well, it is often necessary to print or tentatively insert different types of fishing tools for fishing.

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