March 3, 2020
Due Friday, March 27, 2019
Design a hydraulics program using the wellbore configuration
from “Design Project One” in your proposed area of study.
Use mud pump manufacturers’ catalogs (such as ContinentalEmsco and Gardner Denver, Inc.) to select your pump. Some catalogs
are available at web pages of major mud pump manufacturers.
Calculate pressure drop values in your wellbore using at least
two different flow rates. Use Bingham Plastic non-Newtonian
rheological model for all calculations.
Determine the nozzle sizes and operating conditions (pump flow
rate and pressure) at two different depths (at 6,000 ft and 9,000
ft.) Use maximum bit hydraulic horsepower criteria.
Submit your report (in Word format), program/calculation
file(s) (if used with proper file format), and any applicable
attachments. Use proper name convention given in syllabus for files
and also for submitted names for eCampus link. Submit your final
report as Project Two in MS Word format and other documents in
.pdf, .xls, .xlsx, .mat, or any format using the Turnitin links for
Project Two Part Two.
Dr. Ilkin Belgesu
The goal of this project is to get out the hydrocarbon and oil from the reservoir in a safe
way, and in an efficient, and environment friendly way. Drilling in petroleum industry is one of
the most important parts, and for the rotary drilling process drill string is the important part of it.
This project is aiming on designing a drill string adding on that drill pipe and drill coral and bit
for Black Bear 36 state 705H well.
For the first step, we must choose the type of the drill bit based on the geological
formation of the field. And because of the hard surface and formation of the well, the type of the
drilling bit will be the selected tooth roller cone.
The drill coral is the most important part and section of the drill string that is going to be
designed. And the drill bit size is depending on the inside and the outside diameter of the drill
collar itself. The drill pipe design depends on the collar size and length. The drill pipe design will
be based on the buoyancy factor method. With an OD of 4 and ID of 2 with (32 lb/ft)
For this drill string design safety and efficiency, the grade of the drill pipe will be (Grade E) so
the it can hold more strength and tension.
Black Bear 36 State 705H is a oil well that is located in Lea County, New
Mexico. And it’s an oil and gas type of production well. With a depth of 12471 ft.
Company name: EOG Resources inc.
Well name: Black Bear 36 State 705H
API Number: 3002543585
Location in the united states:
Figure 1: Zoomed out Location of Black Bear 36 State 705H
And here is the location of the well from a top bird eye view:
Figure 2: Location of Black Bear 36 State 705H well.
And this well have: KB = 3670 ft
Green river = 2050, Wasatch= 5695, Mesa Verde= 1056, and all that adds up to the total
of 12471 ft.
This well field does have a little bit of environmental impact, such as it effects the
soil, the water that is underground, because of some chemicals.
Design factors and other assumptions:
When it comes to choose a particular type of drill bit, we have to put in mind the
geological surface formation. Roller cone bits is the most usable drilling bit, because it can drill
soft and very hard surfaces. So, typically the steel tooth roller cone type is going to be used as a
drilling bit for this project.
Figure 3: Drill bit (Tricone Bit)
Table 1: Information about the drill bit.
A drill string is a combination of drill pipe with joints and drill collar. And the drill stem
is built of drill string and other stuff such as stabilizers, mud motor Kelly. As shown in figure 4
Figure 4: Drill string component
The usage of drill pipes is to be used as a well stimulation, and at drill stem testing as a
formation evaluation. And also relocate tools in their places.
Table 2: drill pipe data
To connect the drill pipe to the bit, we have to use the drill collar to do that. But the size
of the drill collar effect the work of the drill bit and the efficiency of it. In other word, it will
reduce the lifetime of the drill bit. So, the outer diameter will be (OD=4) and (ID=2) and that
leaves us with weight of 32 lb/ft.
Table 3: inner and outer diameter sheet
Summary of the results:
Discussion of Results:
After doing the calculations and begun with the buoyancy factor of a value of 0.860 and a
length of 1766.39 ft of the drill collar Length (LDC). And the true depth of the well is 12471 ft
with a measured Drill pipe length (LDP) of 10704.61ft.
As shown from the results table, its noticeable that the allowable tension load of the drill
string with a value of 207900 lbs is greater than the measured tension load of the drill string
which is 145273.6811 lbs. And the collapse pressure is 6095.82, where the Collapse design
factor is 1.37 based on the API table.
Based on the depth of the well, the collapse rating under tension got a value of 7922.22
psi. The yield strength has a value of 2410.32 lb/ft and whereas the polar moment of inertia (J) is
Also, the total stretch of the drill pipe is 140.1 inches, and the critical rotary speed of the drill
pipe (RPM) is 195.21 rpm. And the calculated maximum BHP is 6095.82 psi. And with these
calculations that have been measured, it comes to a result of a design that is possible to be done.
As an approached conclusion, to design a drill pipe string it is very important to have a
buoyancy factor to be measured, because it is the foundation of all calculations that have been
measured. Plus, the P mud was the same for out and in the drill string, and this value can be
changed if needed in real life.
Kipping in mind that with a depth of 12471ft of a well it is critical to have different
loadings. And from the type and the formation of the mud in this well, it was very helpful to pick
a good drill bit for better results.
Work cited page
1) PNGE 310 lecture slide:
2) Figure 1 and 2: http://www.drillingedge.com/new-mexico/lea-county/wells/black-bear-36state-704h/30-025-43009
3) Figure 3: http://bestdrillingbits.com/category/tricone-bits/
4) Figure 4: http://www-odp.tamu.edu/publications/204_SR/106/106_f2.htm
5) Table 3: http://www.steeldrillpipe.com/tubular-products/new-used-steel-drill-collars/
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