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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