Improving the efficiency of the development of the Yubileinoye oil and gas condensate field

1.

Повышение эффективности
разработки Юбилейного
нефтегазоконденсатного
месторождения

2.

GENERAL INFORMATION
Abstract
Tasks
» Most of Western Siberia's unique gas fields are at the final
stage of development. The number of idle wells at the fields is
increasing. At the same time the volume of residual gas
reserves in the Cenomanian deposits exceeds several trillion
cubic meters of gas. In this regard, there is a need to use
methods to improve gas recovery and maintain the operating
stock of wells
» Analyze the geological and physical
condition of the Yuzhno-Yubileinaya area
» Analyze the current state of development
of the Yuzhno-Yubileinaya area
» Analyze existing enhanced gas recovery
methods
» Calculate the proposed method of
enhanced gas recovery with an assessment
of technical and economic efficiency
Goal
» Improving the development efficiency of the Yubileynoye oil
and gas condensate field
General information
General characteristics of the object
Rationale for method
Effect of implementation
Горный университет
2

3.

General information about the Jubilee field
Main challenges
Administrative location
» Nadym
Okrug
district,
Yamalo-Nenets
Autonomous
» Increase of current gas recovery factor
» Presence of trapped gas reserves, 27 bln. м3
Geographic location
» Northern part of the West Siberian Plain within
the Nadym-Pur interfluve
«Jubilee» OGCF
Characteristics of the area
» The territory of the Yubileynoye field is a hilly
and rugged plain with a large number of small
rivers, difficult to access for all types of
mechanical transport
General information
General characteristics of the object
Rationale for method
Effect of implementation
Горный университет
3

4.

Geological and physical characteristics of the Cenomanian gas deposit
Information about reservoir
General characteristics of the deposit
» The PK1 gas reservoirs are massive and
overlain by clayey sediments of TuronianPaleogene age. The area of the deposit is 424.6
million m2. Absolute elevation of the roof is 938
m. GWC is observed in the interval of -1080 to
1087 m.
Geological and physical characteristics of
the reservoir
» 522 – Initial geological reserves, bln. м3
» 140 – Remaining recoverable reserves, bln. м3
» 0,86 – Project КИГ
Consolidated geological and geophysical section of the
current gas saturation of the deposit
» Reservoir type - terrigenous porous
» Effective gas-saturated thickness - 5-44 m
» Formation porosity - 0,24-0,32
» Permeability - 0.341-0.745
» Initial formation pressure - 11.2 Mpa
» Initial formation temperature - 32 ̊С
General information
General characteristics of the object
-
0,9
-
0,8
-
0,7
-
0,6
-
0,5
-
0,4
-
0,3
Rationale for method
Effect of implementation
Горный университет
4

5.

Analysis of the current state of development of the Cenomanian gas reservoir
Pressure dynamics
State of the well stock
current
Injection
General information
General characteristics of the object
inactive
liquidationе
Rationale for method
observation
Effect of implementation
Горный университет
5

6.

Analysis of the current state of development of the Cenomanian gas reservoir
Comparison of design and actual gas
withdrawal indicators
General information
General characteristics of the object
Comparison of design and actual indicators on
the flow rate and the number of wells
Rationale for method
Effect of implementation
Горный университет
6

7.

Analysis of the current state of development of the Cenomanian gas reservoir
Comparison of design and actual indicators of
pressure and flow rate
Conclusion:
Based on the results of the analysis of the current state of
development and geological and physical characteristics, the
following conclusions can be made:
• The Cenomanian gas reservoir has high filtrationcapacitative properties
• The average daily production rate of the well was 454
thous. m3
• The development of the Cenomanian gas deposit at
Yuzhno-Yubileynaya area is lagging behind the project
• The number of producing wells at the field is 33.3% lower
than the target
• Within the last year, 1.44 bcm of gas was produced, which
is 16.7% less than the projected volume (1.73 bcm)
• During the last two years reservoir pressure decreased by
0.39 MPa
• Average reservoir pressure in the gas withdrawal zone for
2019 is 5.49 MPa
• Average wellhead pressure for 2019 is 4.4 MPa
General information
General characteristics of the object
Rationale for method
Effect of implementation
Горный университет
7

8.

Analysis of existing methods for increasing and intensifying gas production
Methods to intensify production and
increase hydrocarbon recovery
» Physical-chemical methods (surfactants)
» Liquids removal from wells (LRW)
» Water shut-off works (WSW)
» Perforating methods (PM)
Number of operations
ВИР, 24
Number of operations, %
ВИР
6%
ПМ, 7
КЛК, 45
ПМ 2 %
КЛК
11 %
Production efficiency per operation
200
ПАВ, 331
млн. м3
150
ПАВ
81%
100
50
0
КЛК
General information
ВИР
ПАВ
ПМ
General characteristics of the object
Rationale for method
Effect of implementation
Горный университет
8

9.

Analysis of existing methods for increasing and intensifying gas production
Conclusion:
Extraction
9000
8000
7000
млн. м3
Based on the analysis of the efficiency of
component recovery enhancement methods, it
should be noted that concentric elevator string
(CLC) descent is the most effective method, with
182 million m3 of gas per operation. The most
inefficient method was physical-chemical
methods (SAW), additional production per
operation was 3.3 million m3 of gas.
6000
5000
4000
3000
2000
There are currently 7 idle wells in the
Cenomanian gas reservoir. I recommend
considering these wells for sidetracking.
General information
1000
General characteristics of the object
0
КЛК
ВИР
Rationale for method
ПАВ
ПМ
Effect of implementation
Горный университет
9

10.

Rationale for the sidetracking section
Analysis of maps of the South Jubilee area
Р, МПа
млрд. м3
Gas-saturated
thicknesses, meters
Location map of current well
bottomholes
General information
Pressure map
General characteristics of the object
Residual reserves map
Rationale for method
Effect of implementation
Горный университет
10

11.

Rationale for the sidetracking section
Map of justification of sidetrack zone
» Map of GWC, residual
gas
reserves
and
effective gas-saturated
thicknesses
» Map of GWC and
residual gas reserves
Based on the maps, the
points of faces and
directions of lateral shafts
were selected
Horizontal section direction
Entry points into the formation
General information
General characteristics of the object
Rationale for method
Effect of implementation
Горный университет
11

12.

Determination of optimum horizontal section length for 301 wells
Let's set the following function of the drilling
cost increase on the length of the horizontal
section
Z ( L) L t [2]
Flow rate vs horizontal length for 301 wells
600,00
t – cost of the lateral wellbore section up to the
entrance to the formation; α – drilling costs per unit
length of horizontal section; ε – cost factor
For well 292 optimum length of horizontal section is
determined by the criterion of maximum allowable
flow rate of 670.5 thousand m3, so the optimal length
of the horizontal section will be characterized by the
maximum allowable flow rate, that is, at a length of
255 meters well flow rate will be 670 thousand m3.
General information
General characteristics of the object
1400
500,00
1200
400,00
1000
300,00
800
млн. руб
Дебит, тыс. м3/сут.
As an economic indicator of the project efficiency let's
take PDD for 11 years, and as a criterion - the
maximum of this indicator
1600
1,4 млрд. руб
600
200,00
400
100,00
200
0,00
0
100
200
300
345 метров
400
500
0
600
Длина горизонтального участка
Rationale for method
Effect of implementation
Горный университет
12

13.

Technical and economic effect of project implementation
1500,00
1000,00
500,00
0,00
2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
Время, лет
КИГ on the variant with side trunks
КИГ on the variant without lateral barrels
Extraction on the variant without lateral barrels
Extraction on the variant with side trunks
10000
8000
8000
млн. м3
10000
6000
4000
4000
2000
2000
0
0
КЛК
ВИР
ПАВ
ЗБС
ПМ
КЛК
ВИР ПАВ
ПМ
12
Capital expenditures
Discount rate
Gas price
10
8
6
4
2
0
-40
General information
6000
ЧДД, млрд. рублей
2000,00
млн. м3
0,77
0,765
0,76
0,755
0,75
0,745
0,74
0,735
0,73
0,725
0,72
0,715
КИГ, д. ед.
Дебит, млн. м3/год
2500,00
Extraction on the variant
with side trunks
Extraction on the variant
without lateral barrels
Additional production from the
implemented method
General characteristics of the object
Rationale for method
-20
0
%
20
40
Effect of implementation
Горный университет
13

14.

Technical and economic effect of project implementation
NPV of the project for 11 years
Conclusion:
According to the results of techno-economic
analysis of sidetracking in wells 292, 301, 311,
312 the following conclusions can be made:
10000
ЧДД, млн. рублей
5000
0
2022
-5000
2024
2026
2028
2030
2032
-10000
-15000
The optimum length of the horizontal section
for well 292 is 255 m, for wells 301, 311, 312 345 m.
Project BFD made 7.15 billion rubles for 11
years at the discount rate of 15 %.
-20000
-25000
-30000
2034
Project profitability - 18% per annum
Время, год
Project pay-back period - 6 years
General information
General characteristics of the object
Rationale for method
Effect of implementation
Горный университет
14