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HDD Assist Methods
This document describes HDD assist methods using pipe rammers to help with problematic horizontal directional drills. It outlines four main methods - washover casings, pullback assist, pipe extraction, and drill stem recovery. For each method it provides details on the process and equipment used as well as examples of jobs where each method helped complete challenging HDD projects.
HDD Assist Methods
- 1. HDD ASSIST METHODS PIPE RAMMING
- 2. HDD RAM ASSIST • When problems arise while horizontal directional drilling HDD ASSIST (HDD) costs begin to add up with each tick of the clock. PIPE RAMMING • Quick reaction time and expert technical support are critical to salvaging a bore gone bad. • The percussive power of pipe rammers can help free stuck product pipes, drill stems, and help remove product pipes on failed bores.
- 3. FOUR METHODS •Washover casings HDD ASSIST •Pull back assist PIPE RAMMING •Pipe extraction •Drill stem recovery
- 4. WASHOVER CASING METHOD HDD ASSIST PIPE RAMMING • Used as a pilot for large HDD projects • Makes a guide down hole for mud motors • Casings are rammed through difficult soil • Casing provides a path for drill fluid conditions to rock or solid soil recycling and reduces the loss of fluids in surface soils
- 5. ON THE JOB:WASHOVER CASINGS • Hong Kong, China –Wash over casing HDD ASSIST • Pipe sizes PIPE RAMMING –2 – 54” casings • Equipment –24” Rammer • Ram distance –2 @ 66’
- 6. PULL BACK ASSISTMETHOD HDD ASSIST PIPE RAMMING • Assist HDD when pullback is not possible • Percussive power frees immobilized and machine still has rotation capabilities product pipes. • Rammer attached to product pipe
- 7. PULLBACK ASSIST HDD ASSIST CONNECTION METHOD STEEL PIPE RAMMING Rammer is locked into steel casing via collets. Steel casing is installed using pullback force of HDD and percussive force of the rammer.
- 8. PULLBACK ASSSIST CONNECTION METHOD HDPE (OPTION 1) HDD ASSIST PIPE RAMMING Rammer is locked into steel casing via collets. The steel casing is connected to the HDPE product pipe via steel to HDPE flange compression kit. HDD pull force is used in conjunction with the rammer to install the pipe.
- 9. PULLBACK ASSIST CONNECTION METHOD HDPE (OPTION 2) HDD ASSIST PIPE RAMMING Rammer is locked into steel casing via collets. Steel casing is welded to steel ring that is flush with HDPE face, and welded to steel sleeve. Steel sleeve is bolted to HDPE product pipe. HDD pull force is used in conjunction with the rammer to install the pipe.
- 10. ON THE JOB:PULLBACK ASSIST • Normangee, TX –Pullback Assist (pipe stuck for 4 HDD ASSIST days before start of assist) • Reason for pullback failure – PIPE RAMMING excessive flooding in area caused collapsed entry pit and hole. • HDD Rig –500,000 lb pullback • Pipe –2,800’ of 36” casing • Equipment –24” Rammer
- 11. ON THE JOB:PULLBACK ASSIST • Stewart, FL –HDPE Pullback Assist, pipe sat HDD ASSIST for more than two weeks before assist could be started due to PIPE RAMMING excessive hurricane season. • HDD Rig –1.2 M lb custom drill rig • Pipe size –4,500’ of 24” HDPE pipe 80’ deep • Equipment –24” Rammer
- 12. PIPE EXTRACTION METHOD HDD ASSIST PIPE RAMMING • Remove stuck product pipe and bore • Percussive action along with static again tension pulls product pipe, removing it • Rammer is attached to product pipe by from the bore fabricating an adaptor
- 13. PIPE EXTRACTION HDD ASSIST CONNECTION METHOD FOR STEEL CASING PIPE RAMMING Rammer is locked into steel casing that is welded onto the product casing. Static pull force is used in conjunction with the rammer to extract the product casing.
- 14. PIPE EXTRACTION HDD ASSIST CONNECTION METHOD FOR HDPE PIPE RAMMING Rammer is locked into steel casing that is welded onto the steel sleeve. Steel sleeve is bolted to HDPE product pipe. Static pull force is used in conjunction with the rammer to extract the product casing.
- 15. ON THE JOB:PIPE EXTRACTION • Orlando, FL –HDPE Pipe Extraction HDD ASSIST • Pipe size PIPE RAMMING –850’ extraction of 30” HDPE pipe • Equipment –16” Rammer
- 16. DRILL STEM RECOVERYMETHOD HDD ASSIST PIPE RAMMING • Recover expensive stuck drill rod • Kinetic energy is used to assist in • Rammer is attached the to drill rod by pulling or pushing rod out of the ground fabricating an adaptor with the assist of static tension
- 17. ON THE JOB:DRILL STEM RECOVERY HDD ASSIST PIPE RAMMING
- 18. RECOMMENDED HAMMERS Calculated Rammer Impact Rate Pipe Diameter HDD Class Impact Force Size BPM Range at 1 ft/min* HDD ASSIST 7” 24,000 lbs 295 184,000 lbs 8” – 16” PIPE RAMMING 24,000; 33,000; 8” 223 252,000 lbs 8” – 24” 50,000 lbs 33,000; 50,000; 12” 271 744,000 lbs 12” – 36” 80,000 lbs 16” 80,000 lbs 231 1,094,000 lbs 12” – 48” 80,000; 20” 190 1,740,000 lbs 20” – 54” 150,000 lbs 150,000 lbs 24” 177 2,020,000 lbs 24” – 72” and larger *The numbers shown here are based on calculation and are for comparative purposes only between various models of HammerHead Rammers. The numbers are not intended for engineering applications.
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Editor's Notes
- #8 When installing a steel pipe, it is usually a simple matter of inserting a set of collets into the pipe which allow the hammer to lock into the casing. In some instances, the pipe may need to be reinforced, or a fabricated adapter may be needed to match the size of the available collets to the size of the product pipe.
- #9 When installing HDPE pipe, an adapter will be needed to allow the connection of the hammer to the pipe. The easiest is a flange adapter that is fused to the pipe string, then a steel casing is added to the flange adapter, and the whole assembly is bolted up. This provides a stub of casing for the collets, which in turn, lock the hammer.
- #10 A second alternative is to fabricate a sleeve which should just fit over the HDPE. The sleeve is then bolted into the HDPE pipe. At the end of the sleeve is a plate that will butt up against the back of the HDPE. Then a casing is welded and gusseted to the plate to provide a receiver for the collets and ramming tool.
- #14 The adapter for steel casing is the easiest; it is simply a piece of casing, which need not be the same size as the pipe being installed, it can be sized to whichever set of collets is most convenient. The piece of casing is welded on top of the product, then gussets are added for increased strength. The collets will go on the front side of the arrangement so that the hammer is pounding the pipe out of the bore.
- #15 For HDPE, a steel sleeve will need to be fabricated to fit more or less snugly over the HDPE, then bolted to the pipe. A piece of casing is welded to the top of the sleeve just like for the steel extraction adapter, to act as a receiver for the ramming tool and collets.