24-Pet-B5 Reservoir Mechanics
Worked solutions to 4 past sittings (2014–2016), 27 questions. Pick a sitting, or start from a topic below.
Topics across the sittings
Topics that come up in more than one sitting, taken from the headings of our worked solutions. A topic counts once per sitting.
- Skin (4 sittings): May 2016 Q3 · December 2015 Q3 · May 2015 Q5 · December 2014 Q4
- Well-testing terminology (4 sittings): May 2016 Q1 · December 2015 Q1 · May 2015 Q1 · December 2014 Q1
- Drawdown test (3 sittings): May 2016 Q3 · December 2015 Q3 · May 2015 Q3
- Initial pressure (3 sittings): May 2016 Q4 · May 2015 Q5 · December 2014 Q5
- Permeability (3 sittings): May 2016 Q3 · December 2015 Q3 · May 2015 Q3
- Average pressure (2 sittings): December 2015 Q4 · December 2014 Q4
- Buildup test (2 sittings): May 2016 Q4 · December 2015 Q4
- Fracture half-length (2 sittings): May 2016 Q6 · May 2015 Q6
- Hydraulically fractured well (2 sittings): May 2016 Q6 · May 2015 Q6
- Reservoir oil in place (2 sittings): May 2016 Q5 · December 2015 Q5
- Sealing fault (2 sittings): May 2015 Q2 · December 2014 Q6
- Storativity (2 sittings): May 2015 Q5 · December 2014 Q4
Questions by sitting
May 2016
- Question 1: Well-testing terminology
- Question 2: Interference test – required production rate
- Question 3: Drawdown test – permeability, skin, and end of wellbore storage
- Question 4: Buildup test – permeability, initial pressure, and skin (Horner)
- Question 5: Extended drawdown – reservoir oil in place
- Question 6: Hydraulically fractured well – fracture half-length and flow regimes
December 2015
- Question 1: Well-testing terminology
- Question 2: Time to finite-acting and flowing pressure at 1 hr and 15 days
- Question 3: Drawdown test – permeability and skin
- Question 4: Buildup test – permeability, skin, average pressure
- Question 5: Extended flow test – reservoir oil in place
- Question 6: Multi-rate test – pressure drop at an interference well
- Question 7: Wellbore storage – end of storage and dimensionless coefficient
May 2015
- Question 1: Well-testing terminology
- Question 2: Sealing fault – pressure after 5 days (method of images)
- Question 3: Drawdown test – permeability and skin from tabulated data
- Question 4: Gas-well buildup – pseudopressure analysis
- Question 5: Naturally fractured reservoir buildup – skin, initial pressure, storativity
- Question 6: Hydraulically fractured well – fracture half-length and skin
- Question 7: Two-rate flow test – initial reservoir pressure by superposition
December 2014
- Question 1: Well-testing terminology
- Question 2: Diffusivity equation and boundary conditions
- Question 3: Radius of investigation at the end of wellbore storage
- Question 4: Double-porosity buildup – storativity, fracture permeability, skin, average pressure
- Question 5: Reservoir limit test – pore volume and initial pressure
- Question 6: Sealing fault – distance to fault and test-duration validity
- Question 7: Interference – pressure at Well A from Well B's two-rate production