integrated drilling services for geothermal …
TRANSCRIPT
RESEARCH POSTER PRESENTATION DESIGN © 2015
www.PosterPresentations.com
Laguna Colorada in the Sol de Manana Field is the first geothermal project in Bolivia.
ENDE plans to drill 25 new wells in the field, yielding a total of 30 wells (including 5
existing wells), with anticipated production of 100 MW for a project life of 30 years. The
scope of the works is to contract the integrated services for the drilling work of 25 deep
geothermal wells, of which 16 are for the production of two-phase, water / steam fluid,
and 9 are for the reinjection of separated geothermal water. Moreover, the integrated
service will include workovers of 5 existing wells (SM1-1V, SM2-1V, SM3-1V, SM4-1V
and SM5-1V), 4 production wells and 1 reinjection well. In order to perform this service, it
is necessary that the Contractor supplies 2 drilling rigs with all the auxiliary and
complementary services, 1 workover rig including the materials necessary to carry out
the works.
The project is applying a development model called integrated drilling services (IDS). In
comparison to the separate contracting of discrete services, the IDS model has important
economic, operational, and contractual advantages. This is why ENDE has chosen this
approach to carry out one of the big geothermal projects in Latin America and one of the
big IDS applications in the world..
INTRODUCTION
INTEGRATED DRILLING SERVICES (IDS)
CONCLUSION
The Sol de Mañana geothermal field is located in the province of Sud Lípez, in the
Potosí department, 20 km south of Laguna Colorada (Figure 1). The elevation of the
area is approximately 4900 m above sea level (a.s.l.).
National Electricity Company (ENDE) 1
Faculty of Engineering, Kyushu University 2
Bruno Pereyra Q. 1, Y. Fujimitsu 2
INTEGRATED DRILLING SERVICES FOR GEOTHERMAL PROJECT LAGUNA COLORADA, BOLIVIA
SOL DE MAÑANA GEOTHERMAL FIELD
Figure 1. Location of the Sol de Mañana field.
IDS is an approach to drilling management in which all services and equipment and
material procurement are integrated under one contract (Schlumberger, 2019). This
model of a contract is technically and economically feasible for the geothermal
concessions owners who usually lack all infrastructures for running a complicated drilling
project.
Instead of making contracts with 15-20 service providers, one can work with just a single
contract. Project management becomes similar and therefore more efficient, and
contracting can apply simplifying clauses as “One Down All Down” (that is, if one piece of
equipment fails or is interrupted for any reason, the remaining equipment will stop with no
charge), to avoid additional costs for the stakeholder or the operator, mitigating NPT
(non-productive time) impact. Using the IDS approach means only one commence date
to start the official operation. This encourages the suppliers of various service to work as
one team and helps ensure that all subcontractors under the contractor will be ready for
the spud date or commencement date.
Figure 2. IDS Stages
WELL DESIGNThe existing wells (SM1-1V, SM2-1V, SM3-1V, SM4-V, and SM5-1V) and the 25 new
wells to be drilled will be used in the implementation of the 100-MW geothermal power
plant for 30 years. Figure 3 shows the wellbore design for Well SM1-1V (existing). The
other production wells (SM2-1V, SM3-1V, and SM5-1V) have the same well design but
have different casing depths. Right side of Figure 3 shows the well design used for the
reservoir model that will be referred as the “Basic Design”.
Figure 3. Existing well design
(SM1-1V) (left) and Basic
Design for new wells (right)
.
Table 1. Time and quantity of the
existing and new wells
.
REQUIRED SERVICES
Laguna Colorada is the first geothermal project in Bolivia. It is the starting point for future
geothermal development, that is why ENDE chose the integrated drilling services (IDS)
for the drilling of the 25 new wells in order to achieve 100 MW of electricity generation.
In this study are considered all the necessary information to run the project from the KOM
(kick off meeting) to the demobilization.
Figure 4. Integrated Drilling Services
Figure 7. Slotted liner 7"
Drilling Time
(Approx.)
Time Time
days days
Production Wells 60 8 480 8 480
Reinjection Wells 45 5 225 4 180
Existing Wells that
need Workover7 3 21 2 14
16 14 30
726 674 1,400
TOTAL WELLS
TOTAL TIME, days
TOTAL
TIME
RIG 1 RIG 2
Days (ea.) Quantity Quantity
1 2 3 4
CS
G.1
85/ 8
"
CS
G13
3/ 8
”
CS
G.9
5/ 8
”
Lin
er
7"
CASING PIPES FEATURES
Drill Bit 24"
70 m of 18 5/8 Pipe BTC
1 18 5/8" Float Shoe de BTC with
“stinger”
3 Centralizer
1 21 ¼” Flange API 2000 weldable
RW: 300 m 13 3/8” Pipe BTC
PW: 350 m de 13 3/8” Pipe BTC
1 Float Shoe 13 3/8" BTC
1 13 3/8" Float Shoe de BTC with
“stinger”
16 Centralizer
1 13 5/8” Well head de API 3000 BTC
RW: 800 m 9 5/8 “Pipe BTC
PW: 900 m 9 5/8 “ Pipe, Semi Premium
1 Float Shoe 9 5/8 “, Semi premium
1 Float Collar 9 5/8 “, BTC Semi premium
with “stinger”
39 Centralizer
RW: 800 m MD
PW: 900 m MD
740 m de 7" Slotted Liner, BTC
1,140 m 7" Slotted Pipe, BTC
1 Guide shoe 7", Semi Premium
1 Liner Hager 9 5/8"
47 # x 7”, 26 #, Semi Premium
1 Liner Hanger 7” x casing 9 5/8”
HOLE1 CSG. 18 5/8" – K55 – 87.5 # – BTC
4
MATERIALS AND ACCESORIES
CSG 9 5/8“–N80 – 47 # – Semipremium
Liner 7" – K55 – 26 #
Semipremium (Slotted)
2 CSG. 13 3/8 – K55 – 68 # – BTC
3
ST
AG
E1
PW & RW: 70 m
Drill Bit 17 ½”
RW: 300 m
PW: 350 m
Drill Bit 12 ¼”
RW: 1,500 m MD
PW: 2,000 m, MD
Drill Bit 8 ½”
KOP
RW: 350 m
PW: 400 m
Hanger
RW: 760 m MD
PW: 860 m MD
ST
AG
E2
ST
AG
E3
ST
AG
E4
Figure 8. Location and distance between
water wells and geothermal wellsFigure 9. Well head for
under balanced drilling
Figure 5. Proposed design for
production and reinjection wells
The services related with the IDS contract are:
Figure 6. Location proposal for new wells