basics of gas drilling operations in texas
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BASICS OF GAS DRILLING OPERATIONS IN TEXAS
Eagle Ford Shale PresentationAugust 31, 2011
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Natural Gas is Found in Shale Deposits
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Eagle Ford ShaleReserves - Texas
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HISTORY OF DRILLING
Vertical Stem Drilling
Slant Drilling
Horizontal Drilling
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Water Aquifers
Oil/Gas Seams
Vertical Stem Drilling
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Slant Drilling
Water Aquifers
Oil/Gas Seams
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Horizontal Drilling
Water Aquifers
Oil/Gas Seams
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Horizontal Drilling
Water Aquifers
Oil/Gas Seams
With Multiple Veins
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Horizontal Drilling
Water Aquifers
Oil/Gas Seams
With Multiple Veins & Multiple Decks
Oil/Gas Seams
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PHASES OF THE DRILLING OPERATION
Site Preparation
Drilling Rig Installation & Operation
Wellhead Establishment & Rig Removal
Site Cleanup
Site Reclamation
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SITE PREPARATION
Field Survey
Construct Access Roads
Construct Drilling Pad
Construct Mud Pits Excavate Mud Pit Construct Liner Membrane
Install Utilities Water for Production
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DRILLING OPERATIONS Drill Rigs are approximately 120 to
145 feet tall and have the following components
Derrick Turntable Blowout Preventer Casing Drill String Drill Collar Drill Bit Mud Pumps
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ANATOMY OF A DRILL RIG
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BLOWOUT PREVENTER
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MUD PITS & LUBRICATING SYSTEM
The mud pit is essential to providing lubrication to the drill bit. The mud is pumped into the drill shaft, used as a lubricant, recycled back out to the mud pit where sediments settle out, and then pumped back into the drill shaft.
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STANDARD DRILL RIG
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Truck MountedDrill Rig
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FRACTURINGFracturing is a process in which the rock is fractured under high pressure in order to open the reservoir and allow more fluid or gas to flow out.
The objective of fracturing is to increase the amount of exposure a well has to the surrounding formation and to provide a conductive channel through which the fluid can flow easily to the well.
A hydraulic fracture is formed by pumping a fracturing fluid into the well bore at a rate sufficient to increase the pressure downhole to a value in excess of the fracture strength of the formation rock. The pressure then causes the formation to crack which allows the fracturing fluid to enter and extend the crack further into the formation. In order to keep this fracture open after the injection stops, sand is added to the fracture fluid. The sand is carried into the fracture and provides enough spacing to allow gas to flow freely to the well head.
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WELL COMPLETION
Once the design well depth is reached, the formation must be tested and evaluated to determine whether the well will be completed for production, or plugged and abandoned.
To complete the well production, casing is installed and cemented and the drilling rig is dismantled and moved to the next site.
A service rig is brought in to perforate the production casing and run production tubing. If no further pre-production servicing is needed, the Christmas Tree is installed and production begins.
Well completion activities include: Conducting Drill Stem Test Setting Production Casing Installing Production Tubing Installing Other Necessary Tanks & Equipment Starting Production Flow
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THE CHRISTMAS TREE
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MERRY CHRISTMAS TREE
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SITE CLEANUP
After the well is completed and the Christmas Tree installed, the site cleanup will commence. This will include:
Removal of all equipment; Environmental cleanup of any incidental spills; Filing in and remediation of the mud pits; Installation of fencing Installation of landscaping (if required); Final site inspection
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SITE RECLAMATION
Site Reclamation is performed after the well is no longer in service. A well that has been “shut in” for 12 or more consecutive months must be reclaimed. This will include:
Removal of all equipment on the site; Plugging of the well; Cut off the pipe three (3) feet below the ground surface; Restore property back to original condition; Inspection by the Texas Railroad Commission.
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