Hydraulic External Cutters

MZS Hydraulic External Cutters are hydraulically actuated mechanical tubing and drill pipe cutters. The cutters are fast, efficient, smooth cutting, and are able of cutting and recovering strings of tubing or drill pipe. The cutter Knives are fed entirely by pump pressure, thus giving the operator sensitive control.

Uses

Used in conjunction with a washover string, the MZS Hydraulic External Cutter may be used to cut and remove stuck pipe. They are able of cutting all types of drill pipe or tubing, regardless of tool joint style.

Construction

Simple, yet rugged, MZS Hydraulic External Cutters are composed of a Top Sub, Body, Guide, a set of Knives, and a Segmented Piston Assembly. Two Shear Pins hold the Piston in a “running in” position until they are sheared to begin the cut.

The Piston Assembly is composed of a Rubber Ring and a set of interlocking, conical piston segments. The segments are held in a contracted position by a tough Rubber Ring stretched around the end of the segments in a suitable groove. Each piston segment has a fluid passage which is engineered to simulta­neously pass fluid for flushing, cooling, and restricting the fluid flow for ample pump-down force on the Knives to effect the cut.

The Top Sub is threaded into the Body. It has a suitable running string connec­tion on the top end. The inner parts of the External Cutter are maintained in position by the Top Sub.

The Body has knife slots on its lower end and threaded connections top and bottom, to accept the Top Sub and Guide. The Knife slots incorporate crossholes for the Knife Pins. Two drilled holes are arranged diametrically opposite each other in the Body, for the Shear Pins.

The Guide is threaded into the bottom of the Body. Its purpose is to guide the fish into the Cutter. The Guide is usually cut­lipped. An alternate guide, such as an extra long wall hook, or mill-toothed guide may be substituted if required.

The Knives are made from tool steel, shaped at the cutting end for most efficient cutting action, and tempered for strength and toughness. The shank end is radius formed to match the concave bearing face against which it rests in the Cutter Body. These Bearing Blocks are an integral part of the Body.

When ordering please specify;

1.      Name and number of assembly of the part

2.      Size and type of top connection

3.      Any desired spares by name