Gulf Drilling Guides: Oilwell Fishing Operations: Tools, by Joe P. DeGeare, David Haughton, Mark McGurk

By Joe P. DeGeare, David Haughton, Mark McGurk

No fishing activity is a welcome operation, yet this new version of a vintage reference is helping you do the activity successfully and economically. This sensible consultant is jam-packed with illustrations and outlines of fishing gear and instruments that can assist you resolve on the subject of any fishing challenge. Foremen, engineers, and superintendents who write methods, make drilling judgements, and supervise operations will locate this convenient booklet valuable, and trainees will locate it an exceptional studying handbook. Oilwell Fishing Operations tells the best way to unfastened caught pipe, half the pipe string, and service casing. It describes many of the forms of catching instruments, jars, turbines, junk, baskets, and hydrostatic and rotating bailers, besides washover operations, wireline fishing, fishing in cavities, and fishing in excessive perspective deviated and horizontal wells. The author's assistance and warnings are bound to prevent money and time in shunned misruns, downtime, and misplaced gear. * at the moment, there isn't any different booklet out there concentrated simply on oilwell fishing operations. * Covers the entire most sensible practices for oilwell fishing operations and all the most up-to-date apparatus. * the 1st booklet within the ''Gulf Drilling Guides'' sequence, the 1st, final, and simply cease for the drilling engineer with an issue to resolve.

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Example text

Because a collar locator is not run, this will ensure that the shot is positioned across a connection, because most pipe lengths are between 28 and 32 in. Therefore, the 35-ft. shot will hit a connection. CHEMICAL CUT This procedure employs an electrical wireline tool, a propellant, and a chemical reactant to burn a series of holes in the pipe, which weakens it so it pulls apart easily. Introduced in the 1950s, chemical cutting was for many years the exclusive, patented process of a single wireline company.

Friction blocks or drag springs are fitted to the mandrel to furnish backup for this release operation. The mechanical inside cutter works by slowly rotating the tool to the right while slowly applying weight, which feeds out the knives on tapered blocks. They engage the inside of the pipe and cut into it. In practically all such cutting tools, springs are used in the feed mechanism to absorb accidental shocks to the workstring, which can cause the knives to gouge or break. Fishing-tool operators will usually run a bumper jar above the inside cutter to control the weight applied to it.

Mechanical internal cutter because of hydrostatic pressure (Courtesy of Baker Oil Tools). inside the workstring. If the casing or fish is in an open hole, a pressure cutter such as the multiple-string casing cutter can be used (Figure 7-5). These cutters are designed for cutting more than one string but can be dressed with single-cut knives. Once the cutter is at the appropriate depth, rotation is started and pump pressure pushes a piston down to make contact with the heels of the knives. This forces the knives out and into the casing.

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