Casing & Cementing Project (Drilling, Petroleum Engineering)
PNGE 310: Drilling Engineering; Project #2 - Summer 2019
Due Date: 7/25/19
In groups of 2, you will design a casing and cementing plan for a horizontal shale gas well. The proposed well
is located just outside of Morgantown, WV and has a planned TD of 18,500ft MD (7,420ft TVD) in the Lower
Marcellus Shale. Utilize the provided geologic prognosis and the WV DEP regulations on “Casing and
Cementing Standards” on eCampus to justify the setting depths of each string of casing. The regulations will
also provide guidance on cementing standards such as top of cement for each string. All casing should be
new, steel, and API certified. You are allowed to combine the coal casing string and the freshwater casing
string in this area.
Casing:
Your design should include the following casing strings for the proposed well: conductor, surface,
intermediate, and production. Specify the hole size that will be drilled and to what depth. There should be at
least 1.5 inches of cement around the casing in the annular on all sides (per regulations) and sufficient rat hole
below the casing (30-50ft). Provide the size & type of casing you chose and to what depth it should be set.
The drift diameter must be larger than the next section bit size. Provide any details of auxiliary equipment
utilized such as a float shoe or centralizers and their placement. Be sure to check for casing failure against
burst & collapse during cementing, and consider the lifting force on the casing after the cement is pumped.
The production casing will be perforated in the lateral and the Lower Marcellus formation will be stimulated
(frac’d). The pressure gradient of the Marcellus is estimated at 0.86psi/ft. The fracture gradient is measured
to be 1.12psi/ft on an offset well. The burst rating of the production casing must support at least 20% above
the anticipated fracture pressure.
Cement:
You should provide a plan for cementing each string of casing. The plan should include the slurry volumes,
displacement volumes, total water required on site, the number of sacks of cement, and how many hours you
will wait on the cement to cure (WOC) for each string of casing. The conductor may be grouted, but all other
strings must utilize the displacement method.
Well Construction Diagram
Casing String Density
[ppg]
Yield
[ft 3 /sk]
Mix
Water
[gal/sk]
500psi Time
[hr:mm]
70Bc
[hr:mm]
Conductor 15.6 1.197 5.247 7:04 3:47
Surface 15.6 1.197 5.247 7:04 3:47
Intermediate 14.8 1.39 6.73 5:27 2:38
Production 14.5 1.260 5.770 9:43 7:30
Cement Slurry Blends
Shallow oil/gas & saltwater
Geologic Prognosis
WELL: WVU#1 COUNTY & STATE: Monongalia County
LOCATION: Pad Elevation: 1085
Top Depth from
Ground Elevation
(TVD)
Formation Possible Show Coal Seam
Thickness (FEET)
Minable Coal
Seam
General Rock Type
0- 80 Zones of fill and shallow water
FRESH
WATER
399 Waynesburg #2 Seam 0.95 NO Coal
404 Waynesburg #1 Seam
FRESH
WATER 3.24 YES Coal
665 Sewickley Coal Seam
FRESH
WATER 6.18 YES Coal
753 Roof Coal Zone Seam
FRESH
WATER 4.20 YES Coal
758 Pittsburgh Coal Seam
FRESH
WATER 7.34 YES Coal
1598 Clarion Sandstone
2320 Big Lime Limestone
2411 Big Injun Top SALT WATER Sandstone
2651 Big Injun Base Grey Shale
3097 50 Foot OIL & GAS Sandstone
3120 Nineveh Sand OIL & GAS Sandstone
3233 Gordon GAS / WATER Sandstone
3362 Fourth GAS / WATER Sandstone
3407 Fifth SALT WATER Sandstone
4861 Elk Siltstone
6837 Rhinestreet Grey Shale
7197 Burkett Black Shale
7222 Tully Limestone
7261 Hamilton Grey Shale
7364 Upper Marcellus GAS Black Shale
7400 Purcell Limestone
7404 Middle Marcellus GAS Black Shale
7416 Cherry Valley Limestone
7418 Lower Marcellus GAS Black Shale
7435 Onondaga Limestone