Outline
 Pore Pressure and Fracture Gradient
 Drilling Fluid
 Casing Design
 Cement Design
 Drilling Bit
 Economic Analysis
Area of Interest
Area of Interest
Area of Interest
Area of Interest
OGIP Surface Map
Porosity Surface Map
Porosity 3D View
Net Pay 3D View
Vertical Well Placement
Horizontal Well
Placement
Future Production
Estimate
Fracturing Well #1
Pore Pressure and
Fracture Gradient
 Equation used
 Pff = 0.33 x [(σOB / d) + 2 x (σpore / d)]
 Pore Pressure Gradient
 Approximately 0.42 psi/ft
 Fracture Gradient
 Approximately 0.73 psi/ft
Casing Design
API GRADE

J-55
Yield Strength
Min Ultimate Strength
40K (min) – 80K (max) [psi]
Min Elongation
60K psi
29.5%
[Table 7.1 from text]
50

Based off of the calculated yield strength: around 42,000 psi

No need for larger ultimate strength

Water Table between 500 – 2000 foot (From NE)

Conductor Casing:
50 feet

Surface Casing:
2200 feet

Intermediate Casing:
6000 feet

Production Casing:
12000 feet
2200
6000
12000
Casing Design cont’d
Casing
Diameter
 Conductor
23.125 in
 Surface
19.2 in
 Intermediate
13.5 in
 Production
•
SF = 1.7
9.4 in
Casing
Pressure
20 in
35 psi
14 in 1100 psi
11.25 in
8.4 in 4850 psi
2460 psi
Casing Design cont’d
Casing
Collapse Res.
 Conductor
480 psi
 Surface
1875 psi
 Intermediate
5500 psi
 Production
10200 psi
 MW = Pressure x (0.052 x TVD)
Drilling Fluid
Casing
Mud Weight
 Conductor
13.4 ppg
 Surface
8.76 ppg
 Intermediate
7.58 ppg
 Production
6.16 ppg
 MW = Pressure x (0.052 x TVD)
Cement Design
 Type: Class C
High early strength properties which allows cement to be
used at high water levels.
Regularly used for shallow well cementing operations
through salt beds.
 Density of the cement = 11.53 ppg
Cement Design cont’d
 Ac = ( dout2 – din2) / 1029.4 (bbl/ft)
 Volume = Ac (bbl/ft) * Depth (ft)
Casing
Cement Volume
 Conductor
6.5 bbl
36.498 ft3
 Surface
368.9 bbl
2071.37 ft3
 Intermediate
324.58 bbl
1822.52 ft3
 Production
207.49 bbl
1165.07 ft3
 Total cement Volume
907.47 bbl
5095.44 ft3
Drilling Bit
 Drilling through shale and sandstone
 We will use Poly diamond crystal bit (because they are
faster and tend not to break as often as other bits)
 Use multi pad drilling (Will use 75% less land)
Drilling
 How many days to reach depth?
 It will take about 14 and half days to drill to the pay
zone with an average rate of penetration of 34.3 ft/hr
Economical Analysis
 How much will it cost per day?
 rule-of-thumb for trip-time estimations is 1 hr/1,000 ft of
a well.
 C= [(R=$1125)( (t=12 hrs) +(td=350hrs)+Cb
$25,000]/(F=12,000ft) = $36.02/ft
 $29,652.35
 How much will it cost total to drill?
 $432,331.27
Thank You!
Any Questions?