Directional or Slant Hole drilling as it is commonly known is the practice of drilling non-vertical wells. This technique is commonly used in Surface to In-Seam Degasification of Coal Mines.
After consultation with the Coal Seam Gas Industry Coe Drilling purchased Schramm's newest rig in their Telemast® Range of Drill Rigs, the T130XD Trailer Mount. This rig is compact yet efficient and meets all the requirements for the Coal Seam Gas and Coal Bed Methane Drilling sectors.
T130XD is the most practical Rig on the market for Gas Drilling with it's capability of Range 3 Casing and Drill Pipe (in the vertical) and Range 2 when drilling slant holes. The Telemast Rotadrill model (pictured) features fast set-up, improved productivity and improved safety on the jobsite.
The automated pipe-handling system is a hands-free activity, making it much safer than the more common manual pipe-handling systems. Safety is always an important consideration for the driller and this hands-free system helps guard the drilling crew against incurring smashed limbs. Add to the safety factor the superior drilling production and it can be seen why the Schramm Telemast equipped drilling rig has been an instant success. Schramm has positioned the Telemast rigs in the marketplace as an alternative to conventional double-drilling-rig systems by offering a level of automation.
Telemast rigs can be supplied with power breakout (hydraulic roughneck), power slips and the Schramm LoadSafe automated pipe handling system and are ideally suited for shallow oil and gas, surface-hole, coal bed methane (CBM), large diameter wells, directional and unconventional drilling applications.
The T130XD Trailer Mount has been designed by incorporating the characteristics of the larger TXD Rotadrill. This has given the T130XD Trailer Mount some distinct advantages. Rotary Head Rotation performance has increased with 185rpm @92,000 in-lbs. and 92rpm @ 206,000 in-lbs. being produced, this coupled with the increase of the Rapid Feed performance to 83ft/min @130,000lb pullback, 125 ft./min @103,000 lb. pullback and 166 ft/min @87,000lb pullback makes the T130XD Trailer Mount the most capable Drill Rig in its class available in Australia.
How the Telemast® Works
The Telemast tower is a two-section mast with the outer mast a static, free-standing member located at the drilling rig base and the inner mast a sliding extendable member that telescopes in and out of the outer mast while drilling is being performed. The drilling top head moves up and down through a simple system of cables and sheaves, in concert with the inner mast, which is powered by double acting hydraulic cylinders.
LoadSafe® Automated Pipe Handling
The Telemast feature is not the only major attribute to be found in the Schramm product line. Just as important is the LoadSafe system, a specially designed drill pipe and casing handling system, which automatically feeds the drill top head one-by-one as additional lengths of drill pipe or casing are added to the string. The LoadSafe system incorporates a special tandem axle trailer for transportation with a conventional road tractor. When set up for drilling activities, the pipe-casing trailer is kept in the horizontal position by a series of outriggers. Up to 40 pieces of pipe can be staged on the LoadSafe hydraulic pipe racks for use during the drilling process.
By hydraulic action, the individual pipe or casing joint that rests in the cradle is tilted up from the horizontal position to a precise incline position so it is in alignment with the drill head assembly, that simultaneously tilts up to receive the pipe or casing. Once the two have been aligned, a hydraulic powered gripping jaw automatically holds the pipe or casing in place while the drill top head is connected to the pipe or casing joint.
With the pipe or casing now connected, the head tilts down simultaneously into the drilling position as the cradle that held the pipe or casing lowers to the horizontal position to receive another pipe or casing joint. The cradle is fed a new piece of drill pipe or casing by rolling from the pipe storage racks into the cradle. This sequence of events is reversed when removing pipe from the string, setting it in the cradle, and rolling it back into the pipe storage racks.
The Schramm Load Safe system minimizes drill crew size and greatly reduces fatigue and potential personnel injuries when handling heavy drill pipes, collars and casing tubular. Another very important attribute of the automated pipe-handling system is its versatility to handle large diameter and random length tubulars, important to many operators because longer range III casing is less expensive and less time consuming to run than cut to exact length range III or shorter range I or II casing.
More than just Telemast® Advantages
Schramm Rotadrill products are successful in the energy market because of the following:
Local Support & Service
They are less hazardous-no rotary table, no spinning chains, no racking board, no tongs, no manual slips.
Initial and operating costs are lower than legacy rigs.
Crews are smaller.
Mobility is greater, pad size is smaller and environmental impact is less.
There is less down-time between holes because set-up, breakdown and move is quicker.
The rigs are more productive:
Mechanized handling of tubular - the machine does not tire.
Controlled bi-directional drilling means fewer collars, better directional capability, and, the ability to drill out of a hole when necessary.
They are standard products that are stocked and serviced locally