CMA CMA Production & Operations Analysis 1 — Questions and Answers
Question 1: Which production decline curve model assumes a constant fractional decline rate over time?
- Exponential decline (Correct answer)
- Hyperbolic decline
- Harmonic decline
- Logistic decline
Correct answer: Exponential decline
Exponential (geometric) decline assumes a constant fractional production decline rate per unit time, resulting in a straight-line plot on a semi-log graph of rate versus time.
Question 2: In decline curve analysis, what does the hyperbolic exponent 'b' represent?
- The rate of change of the decline rate itself, indicating how quickly the decline rate is decreasing (Correct answer)
- The initial production rate at the start of decline
- The final decline rate the well will reach at economic abandonment
- The ratio of oil to gas production in a multi-phase well
Correct answer: The rate of change of the decline rate itself, indicating how quickly the decline rate is decreasing
The hyperbolic exponent b (ranging 0 to 1) describes how rapidly the decline rate decreases over time; b=0 is exponential, b=1 is harmonic, and intermediate values are hyperbolic.
Question 3: What is 'economic limit' in the context of oil or gas production?
- The production rate at which operating costs equal revenue, making further production uneconomic (Correct answer)
- The maximum regulatory production rate allowed by the state
- The reservoir pressure threshold below which production cannot continue
- The minimum royalty rate below which production is not profitable
Correct answer: The production rate at which operating costs equal revenue, making further production uneconomic
The economic limit is the monthly (or daily) production rate at which the well's gross revenue exactly covers its operating expenses; below this rate, the well costs more to operate than it earns.
Question 4: What does 'EUR' stand for in mineral production analysis, and why is it important to appraisers?
- Estimated Ultimate Recovery — the total volume of minerals projected to be recovered over the life of a well (Correct answer)
- Economic Upstream Revenue — the net income from a producing mineral interest
- Effective Unit Rate — the average production rate per unit of mineral acreage
- Expected Undeveloped Resources — undrilled locations estimated to contain minerals
Correct answer: Estimated Ultimate Recovery — the total volume of minerals projected to be recovered over the life of a well
EUR is the total quantity of oil or gas projected to be produced from a well before it reaches its economic limit, and it is the foundation for reserve estimates and royalty income projections.
Question 5: Which operational metric measures how efficiently a well converts reservoir energy into surface production?
- Recovery factor (Correct answer)
- Production rate per foot of pay
- Gas-to-oil ratio (GOR)
- Water cut percentage
Correct answer: Recovery factor
Recovery factor is the percentage of original oil or gas in place (OOIP/OGIP) that is ultimately produced, reflecting reservoir quality, drive mechanism, and operational efficiency.
Question 6: What is 'lifting cost' (also called LOE — lease operating expense) in mineral production?
- The per-unit cost of extracting and bringing minerals to the surface and preparing them for sale (Correct answer)
- The cost of transporting minerals from the production site to market
- The cost paid to the lessor to initiate and maintain a mineral lease
- The capital cost of drilling and completing a well
Correct answer: The per-unit cost of extracting and bringing minerals to the surface and preparing them for sale
Lifting cost (LOE) is the ongoing operating expense per barrel or MCF to produce, gather, and treat minerals at the wellsite, excluding capital drilling costs and royalties.
CMA CMA Production & Operations Analysis 1
Which production decline curve model assumes a constant fractional decline rate over time?