+ All Categories
Home > Documents > Shale Gas Extraction

Shale Gas Extraction

Date post: 24-Feb-2016
Category:
Upload: harlow
View: 55 times
Download: 0 times
Share this document with a friend
Description:
April 12, 2012. Shale Gas Extraction. The Utica and Marcellus Plays. Utica and Marcellus Shale are in the Appalachian Basin. Relative & Approximate Depth. Drilling . Typical Gas Well X-Section. Multiple Layers of Steel Casing and Cement Grout . Vertical & Horizontal Drilling. - PowerPoint PPT Presentation
Popular Tags:
11
Shale Gas Extraction April 12, 2012 1
Transcript
Page 1: Shale Gas Extraction

1

Shale Gas ExtractionApril 12, 2012

Page 2: Shale Gas Extraction

2

The Utica and Marcellus Plays

Utica and Marcellus Shale are in the Appalachian Basin

Page 3: Shale Gas Extraction

3

Relative & Approximate Depth

Page 4: Shale Gas Extraction

4

Drilling

Page 5: Shale Gas Extraction

5

Typical Gas Well X-Section

Multiple Layers ofSteel Casing and Cement Grout

Page 6: Shale Gas Extraction

6

Vertical & Horizontal Drilling

Well typically drilled vertically to 500 above Marcellus Shale

Curve from vertical to horizontal approximately 1,200 linear feet

Continues horizontally for several thousand feet

Final casing string cemented in place at end of well bore

Approximately 15 to 30 days required to drill a horizontal Marcellus well

Example illustrates 7,000 depth to shale (Typical for Pennsylvania)

Page 7: Shale Gas Extraction

7

Multiple Wells from a Single Pad

Line = 1,000 feet

Page 8: Shale Gas Extraction

8

Hydraulic Fracturing Intensive 24-hour operation,

typically taking place over several days to stimulate the entire horizontal wellbore.

High-volume fracturing used for horizontal well development

Process begins by perforating casing, cement and shale with perforating gun

Charge from gun opens fissures in shale to release natural gas, sand necessary to expand and prop open fissures

Water & additives injected under high pressure to carry sand into fractures

Page 9: Shale Gas Extraction

9

Hydraulic Fracturing

• Perforate the well casing & grout in sections

• Pressure & Volume highly dependent upon local geology

• Proppant (typically sand) keeps the fractures open

Page 10: Shale Gas Extraction

10

Hydraulic Fracturing

> 1.2 Million wells hydraulically fractured in the US since 1949

“Typical” Fracture Fluid ~ 99.5% Water & Sand Remaining ~0.5%

▪ Surfactant▪ Gelling Agent▪ Friction Reducers▪ Acid▪ Biocide & Others

500,0000 to 4.0M gallons water/Marcellus well

20% – 30% returns as “Flow-back” water within a few days; “produced water” follows

Recycling or T&D Pennsylvania AMD Re-use??

Page 11: Shale Gas Extraction

11

Water Consumption

5,930

1,680 1,550

268

6,000

5,000

4,000

3,000

2,000

1,000

0Power

generationIndustrial Public Water

systemsOther Mining Marcellus

Shale Drilling

182 60

Mill

ions

of G

allo

ns p

er D

ay


Recommended