Anti-tripping reverse buckling device

Abstract

The invention relates to an anti-tripping reverse buckling device. An oil pipe coupling is connected with an upper joint. An inner shoulder of a reverse buckling inner joint is hung on an outer shoulder of the upper joint. A reserve buckling external thread at the lower part of the reverse buckling inner joint is connected with a reverse buckling internal thread of the reverse buckling outer joint. The upper part of a lock sleeve is sleeved outside the upper joint. The upper joint is provided with a convex key. The interior of the lock sleeve is provided with a lock key groove, and the convex key is inserted in the lock key groove. The lock sleeve is fixed on the upper joint by a shearing pin. The interior of the reverse buckling inner joint is provided with a positive key groove, and the convex key is inserted in the positive key groove. A spring is arranged between the lock sleeve and the reverse buckling inner joint. The lower part of the lock sleeve is provided with a groove key, the upper part of the reverse buckling inner joint is provided with a groove key, and the groove keys are buckled. Under the action of the convex key, the lock key groove, the groove key on the lower part of the key sleeve and the groove key on the upper part of the reverse buckling inner joint, when the oil pipe is positively reversed, the connecting part of the reserve buckling external thread at the lower part of the reverse buckling inner joint and the reverse buckling internal thread of the reverse buckling outer joint can not trip, therefore, the invention can be matched with a tool for positively rotating oil pipes.

Description

Technical field: [0001] The invention relates to a downhole tool used for oil and water wells in an oil field, in particular to an anti-off and back-off device. Background technique: [0002] After long-term production and use of oil and water wells, most of them have problems such as wellbore deformation and diameter reduction. Pipe jamming accidents often occur during operation. A certain part was turned upside down, causing downhole tool parts to be scattered, which brought great difficulties to salvage and remove the falling objects, and greatly increased operating costs. Some wells were scrapped because they could not fully fish out the scattered water injection packer parts. cause major economic losses. In order to solve this problem, the oil field often adopts reverse buckle joints (also called safety joints). The reverse buckle joints are connected by left-handed threads. However, this reverse buckle joint cannot be used in conjunction with tools that require forwa...

AI Technical Summary

Problems solved by technology

However, this reverse buckle joint cannot be used in conjunction with tools that require forward rotation of the tubing, such as Y221 packers, because when the forward rotation of the tubing will cause the reverse buckle joint to trip and fall into the well, and the Y221 packer needs to be positively rotated when setting. Transfer hose

So the use of snap-back fittings is limited and cannot be used on all wells

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