Curtin University Department of Petroleum Engineering Fundamentals of Reservoir Engineering PEEN6004Assignment 1 PEEN6004- Fundamentals of Reservoir Engineering Chapter 2 – Basic Concepts in Reservoir Engineering Important note: · All the students are to answer ALL questions. Question 1.1 The vertical exploration well Genesis-1 was drilled to a total depth of 12,500 ft offshore in the Canning Basin. During drilling no gas was found to be present in the mud but oil florescence was seen in the drill cuttings. Prior to running the 9 5/8 inch casing string it was decided to run the modular dynamic tester (MDT) in the open hole over the sand body to help confirm the fluids present in the reservoir identified earlier from well logs. The data obtained from the MDT survey is provided in Table 1. The data was measured “Relative to Kelly Bushing” (RKB) which was 75 ft above the mean sea level (MSL). You are required to carry out the following. Remember, your answers should be in Field Units. 1. Identify the fluid contacts present (if any) across the formation, with depths referenced to a sub-sea (SS) datum. 50% 2. Calculate the various fluid gradients and densities.40% 3. Comment on the hydrostatic pressure regime of the reservoir.10% Depth Formation (RKB) (metres) Pressure (psia) 3,523 4,973.0 3,528 4,974.3 3,529 4,974.6 3,530 4,974.8 3,531 4,975.1 3,532 4,975.4 3,536 4,978.3 3,540 4,982.9 3,543 4,986.3 3,546 4,989.8 3,549 4,993.2 3,556 5,002.8 3,560 5,008.5 3,570 5,023.0 3,572 5,025.9 3,586 5,046.1 Table 1. MDT survey data Question 1.2 An offshore exploration well was drilled 100km North of Rottnest Island, in 100ft water depth, to a total depth of 3,200 ftSS. The well was logged, cased and perforated across the interval of 2,700 to 2,780 ftSS. The well produced quite steadily 1,000 barrels of oil at a water cut of 5% and a constant GOR of 300 scf/stb over a period of 8 hours. From well logs it has been confirmed that the oil water contact is at 2,800 ftSS. An MDT survey was performed across the formation; however, only two pressure measurements were made due to tool problems. Depth (ftSS) Pressure (psia) Temperature (oF) 2,450 1,184 100 2,700 1,225 100 Specific gravity of the gas produced was 0.7 relative to air at 14.7psia and 60oF and the gas deviation factor is nearly constant at 0.825 across the pressure interval of 1,150 to 1,200psia. Reservoir water was tested at surface and the density was found to be 65.40lb/ft3 with a formation volume factor of 1.022. API gravity of stock tank oil is 25. You are required to 1. Identify the gas oil contact. 70% 2. Estimate the height of the oil column. 30%Question 1.3 Analyse the reservoir production data in Table 1 and then: · Calculate the Stock Tank Oil Initially in Place (STOIIP) from the geologist’s volumetric estimate given in Table 2. 20% · Identify the drive mechanism(s) occurring during production. 45% · Estimate the .