2015ARKH-P5-Field Development Evaluation(80s)
.pdf
APPRAISAL PHASE
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PRELIMINARY STUDIES
PRELIMINARY STUDIES & APPRAISAL PHASE
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Exploration |
Appraisal & |
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prelim.studies |
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Development |
Production |
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Development |
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Project |
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Field |
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Abandon. |
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Discovery |
Initial |
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Initial |
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qualification |
evaluation |
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appraisal |
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INVESTMENT |
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SITE |
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REHABILITATION |
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DECISION |
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DISCOVERY |
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FIRST OIL |
PRODUCTION |
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END |
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PRELIMINARY STUDIES & APPRAISAL PHASE
Evaluation
of exploration potential
Discovery |
Initial |
Initial |
qualification |
evaluation |
appraisal |
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To quantify OOIP |
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To validate and |
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& reserves |
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To reduce the |
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officialize the |
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To recommend an |
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key uncertainties |
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discovery |
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To prepare the |
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appraisal program |
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To prepare the |
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To define the |
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comparison of |
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initial evaluation |
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development |
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minimum reserves |
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schemes |
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case |
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Further Appraisal
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Positive |
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Commercial |
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End |
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exploration |
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Discovery |
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of initial |
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discovery |
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well |
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appraisal |
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THE INITIAL EVALUATION
At the beginning there is one successful and may be some dry exploration wells, very limited seismic studies and geological hypothesis
From very limited Reservoir knowledge, the OOIP is appraised and the Reservoir uncertainties are highlighted
An appraisal program of the Reservoir is defined (3-D Seismic, appraisal wells, sub surface studies …) to get a better Reservoir knowledge and to reduce the level of the uncertainties.
The minimum amount of Reserves which could lead to an economical development is defined
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THE CONCEPTUAL STUDIES
MAIN DEVELOPMENT STUDIES PHASE
Expllorati
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Appraisal |
Field |
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Development |
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Development |
Production |
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studies |
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Project |
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Field |
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Conceptual |
Pre-project |
Abandon. |
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studies |
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INVESTMENT |
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SITE |
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REHABILITATION |
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DECISION |
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DISCOVERY |
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FIRST OIL |
PRODUCTION |
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END |
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CONCEPTUAL STUDIES
Objectives:
Compare several development scenarii and recommend the best one (Concept selection)
Identify the remaining reservoir uncertainties and propose a programme to reduce them (complementary appraisal or specific data acquisition during development)
Confirm the economics of the project based on the recommended scenario
Evaluate cost and duration of the pre-project phase
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CONCEPTUAL STUDIES & CONCEPT SELECTION
Target : Select the best scheme for field development
How ?
List the alternative schemes/concepts/scenarios to be studied :
Common sense
Brainstorming
Analogues
Two-step analysis
1) Selection of a limited number of cases ("screening")
2) Detailed analysis of the 3 or 4 shortlisted cases
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CONCEPTUAL STUDIES: TECHNICAL CONCEPTS EXAMPLES
Phased Development or not
Unmanned or manned platforms
Offshore treatment or onshore treatment
Monophasic or diphasic flow
Access by helicopter or by boat
Conventional platform or submarine wells completion
Spare wells or not
Process redundancy or not
Redundancy for critical equipment or not,
Production of utilities or buying utilities from third parties
Scenario for product offloading and marketing
CONCEPTUAL STUDIES CONTENT (for each scheme)
Reservoir Development Plan
Material balances
Wells description
PFDs (Process Flow Diagrams) + sometimes simplified PIDs (Piping & Instruments Diagrams)
Surface facilities description
Main equipment list
Layouts
Simplified Operating Philosophy
Preliminary Safety concept (including Hazid)
Preliminary development schedule
Costs estimate (Capex & Opex)
Economic evaluation
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