What are they drilling for in the Marcellus Shale?
About Marcellus Shale The Marcellus Shale is a geologic formation of shale rock buried deep under parts of Pennsylvania, New York and West Virginia. This formation contains a large amount of natural gas distributed throughout the shale in cracks and pores.
How is natural gas extracted from Marcellus Shale?
Hydraulic fracturing – commonly known as fracking – is the process used to extract shale gas. Fracking fluids containing sand, water and chemicals are then pumped at high pressure into the drilled holes, to open up fractures in the rock, enabling the trapped gas to flow through the fractures into collection wells.
What is the process of horizontal fracking?
The process involves drilling a well vertically to a certain depth and then bending the path of the drilling until it extends horizontally. Hydraulic fracturing is a completion technique, meaning it is performed after the oil or natural gas well has been drilled.
How does horizontal oil drilling work?
Horizontal drilling is the process of drilling a well from the surface to a subsurface location just above the target oil or gas reservoir called the “kickoff point”, then deviating the well bore from the vertical plane around a curve to intersect the reservoir at the “entry point” with a near-horizontal inclination.
Is petroleum a shale gas?
Shale gas refers to natural gas that is trapped within shale formations. Shales are fine-grained sedimentary rocks that can be rich sources of petroleum and natural gas.
How is a horizontal well drilled?
Most horizontal wells are started by drilling a vertical well. After drilling down to the target rock, the pipe is pulled out of the well and a motor is attached to the drill bit. In a horizontal well, the bit and pipe are lowered down into the well and the bit drills a path that curves from vertical to horizontal.
How is petroleum extracted?
Petroleum reservoirs can be found beneath land or the ocean floor. Their crude oil is extracted with giant drilling machines. There are huge quantities of petroleum found under Earth’s surface and in tar pits that bubble to the surface. Petroleum even exists far below the deepest wells that are developed to extract it.
How is methane extracted from shale reservoir?
For shale gas, hydraulic fracturing of a reservoir is the preferred stimulation method (see graphic below). This typically involves injecting pressurized fluids to stimulate or fracture shale formations and release the natural gas. Sand pumped in with the fluids (often water) helps to keep the fractures open.
What is the drilling process?
Drilling is a cutting process that uses a drill bit to cut a hole with a circular cross-section in solid materials. The drill is usually a rotating cutting tool, often multi-point. Instead, the hole is usually made by hammering a drill bit into the hole using rapidly repeated short strokes.
What are 5 steps in the process of fracking?
Drilling and the Hydraulic Fracturing (Fracking) Process
- Preparation. Preparing a drilling site involves ensuring that it can be properly accessed and that the area where the rig and other equipment will be placed has been properly graded.
- Drilling.
- Well Completion.
- Production.
- Well Abandonment.
Why horizontal wells are drilled?
A horizontal well is a type of directional drilling technique. Operators use it to retrieve oil and natural gas in situations in which the shape of the reservoir is abnormal or difficult to access. It permits access to subsurface reservoirs that may not be accessible from directly above.
What are the benefits of horizontal drilling?
The advantages of using horizontal drilling include:
- Durability, as the pipes are very strong.
- Quicker installation with less disruption to landscaping.
- Lower installation cost with a smaller crew.
- Flexibility, as the system can be installed nearly anywhere.