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Drilling Industry NewsConstruction DrillingHorizontal Directional Drilling

New HDD Extraction Cradles From HammerHead Trenchless

Same Cradles Can be Used With Range of Hammer Sizes

HammerHead Extraction Cradle
February 5, 2016

Pipe ramming tools from HammerHead Trenchless Equipment can now be locked inside a wide range of ready-made extraction cradles manufactured by the company.

The extraction cradles, sometimes referred to as “canoes,” enable horizontal direction drilling (HDD) contractors to orient a ramming tool 180 degrees to extract stuck pipe or tooling, assist in product pullback and remove  washover casing at the end of the HDD job. Extraction cradles also give pipeline installers an effective means to slick bore and install cathodic protection (CP) pipe.

Unlike fabricated offset mounts that lose a significant portion of ramming energy laterally, an extraction cradle is mounted directly in line with the pipe or tooling. This alignment transfers impact force from the ramming tool to the pipe or HDD tooling with maximum efficiency.

Alan Goodman, a global sales manager for HammerHead Trenchless Equipment, says the ready-made extraction cradles are reusable and highly versatile. A single cradle can also accommodate a range of both pipe and hammer sizes.

“For instance our 36-inch extraction cradle can mount to 36-inch casing on one end and a 30-inch casing on the other end,” he says. “Then it can be modified further to address other casing sizes by using standard pipe reducers. This means the same cradles can be used with our 26-inch, 24- or 20-inch hammers.”

Slick Boring Pipeline

One of the key uses of the extraction cradle is in a trenchless pipeline installation method called “slick boring,” an effective, safe method of installing pipeline products, which are routinely protected by a coating supplemented with cathodic protection (CP). A CP system protects a wide variety of metallic structures from corrosion in various environments unless it is compromised.

To install a coated-lined pipe with a pipe ramming tool, a slick bore contractor simply drives a sacrificial, standard casing as a “dummy” into the ground with conventional pipe ramming technique. The contractor removes the ramming tool to place it in the extraction cradle, which has been mounted at the other end of the pipe.

The contractor welds the new coated-lined pipe to the dummy casing that was initially rammed into place. As the hammer locked inside of the cradle extracts the dummy casing from the ground, the dummy casing pulls the coated-lined pipe into place. The dummy casing, which takes the brunt of the impact force as the casing cuts and drives the casing forward, can often be reused for additional slick boring jobs.

HDD Completion Insurance

Having an extraction cradle and hammer on hand during challenging HDD operations helps to assure the contractor of completion. “Stuck pipe or tooling is an urgent situation,” Goodman says. “Since there is little fabrication or welding needed, the contractor begins efforts to save the bore, pipe, or tool string as quickly as possible.”

Minutes make the difference in such cases, he says. “There’s no 100-percent guarantee that ramming a stuck pipe or drill stem will save a job. While it’s definitely the best technique available for getting them moving again, the chances of saving the borehole and freeing pipe or tooling go down with the length of time they remain in the ground. If the contractor doesn’t have a standby extraction cradle and hammer, HammerHead Trenchless Equipment will rush one of each to the site immediately upon getting the call for help. We can also have a technician there on site with them.”

Removing Washover Casing

HDD contractors drive washover casing to reach more favorable drilling conditions, isolate drilling operations from the formation, protect circulation, and ensure maximum recovery of fluids. Pipe ramming tools mounted in extraction cradles are an effective means of extracting the washover casings at the end of the job. 

The HammerHead Trenchless Equipment extraction cradle comes in a variety of sizes and is available from HammerHead Trenchless Equipment or from authorized dealers, worldwide.

HammerHead Trenchless, a Charles Machine Works Company, of Lake Mills, Wis., manufactures and delivers a unique combination of repair, rehabilitation and installation equipment and consumables for the underground construction market. Besides being a full solutions provider in repair and rehabilitation, HammerHead also offers field support and project consultation to its customers worldwide. HammerHead products are proudly made in the U.S. and sold and serviced in more than 63 countries. For more information, visit www.hammerheadtrenchless.com.

KEYWORDS: HammerHead Trenchless horizontal directional drilling

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