Xi’an Chancemate Petroleum Mechanical Co.,Ltd

Product pictures of hydraulic external cutter and hydraulic internal cutter

hydraulic external cutter is hydraulically actuated mechanical tubing and drill pipe cutters. The cutters provide fast, efficient, smooth cutting and are capable 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.

Operation for hydraulic external cutter:

To operate, assemble the cutter using the proper size and type of piston assembly. Run the cutter into the hole to cutting depth. When cutting depth is reached, open the fill-up and standpipe valves just enough to shear the shear pins. Begin slow rotation - 15 to 25 rpm. Slowly close the bypass valve again to pump fluid down the working string. This will begin feeding the knives to start the cut. The amount of pressure and gallons per minute required depends on the cutter size and piston assembly being used. Use extreme caution to avoid surging of pump pressure when starting a cut. Pressure surging causes the string length to contract and expand, moving the cutter up and down. This motion prevents the knives from remaining in one position when starting a cut. A rough chattering action followed by the smoothing of the rotary will signal the completion of the cut. Bring the cut section out and strip it from the wash pipe. Do not spud coming out of hole.

Construction of hydraulic external cutter:

Simple, yet rugged, Bowen 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.

Specification of hydraulic external cutter

The hydraulic internal cutter is a simple, efficient tools for cutting tubing, casing or drill pipe. They are available in sizes for cutting 1-1/2" tubing up to 20-1/2" casing. Collar Finders  assembled at the bottom of a Cutter, enable the operator to locate the nearest collar to the cutting depth. Construction permits free lowering into pipe. When the assembly is raised, the upper ends of the Collar Locators engage the space between two joints of pipe. Additional upward pull snaps the Shear Pin; the reaction in the string is very apparent at the surface and the operator then knows the exact location of the collar.

Features of hydraulic internal cutter: Manufactured to exacting standards, Internal Cutters permit the redressing of a basic assembly in order to cut alternate sizes of pipe. Internal Cutters are used to cut tubing, casing or drill pipe. They may be run on sucker rods, macaroni strings, tubing, or drill pipe, depending upon the diameter of the pipe to be cut.

The hydraulic internal cutter consists of a Wiper Block (or a Drag Spring) Assembly to accomplish setting in the pipe; Slips and Cone Assembly to anchor the tool; a Main Spring to assist in maintaining uniform feed to the Knives; wedge-like Knife Blocks to drive the Knives upward and outward to engage the pipe; and hardened and ground Knives for easy, efficient cutting.

An important feature of the Bowen Internal Cutter is the "Automatic Bottom." This device permits the operator to set the cutter at any desired depth, to release the tool and to reset at another depth, all without coming out of the hole.

Specification of hydraulic internal cutter