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Question 1 (5 Marks each part) In the gas cap drive reservoir illustrated below a. Where would you place a production well (or wells)? Would you put the perforations at the top or bottom of the reservoir section in the well(s)? Give reasons. b. If you then decided to water flood the reservoir where would you put the injection well, and would you move the production well(s)? Give reasons. Gas Oil Contact (GOC) Low Water Oil Contact (WOC) Question 2 (10 Marks each part) An Oilfield is roughly 5 kilometres long and 2 kilometres wide, the average thickness of the oil column is 30 m, average porosity in this thickness is 20% and Water Saturation is 15%. A PVT analysis data is given below. DST analysis indicated a permeability of 200 mD and an initial reservoir pressure of 4000 psi. The well will be produced with a bottom hole pressure of 1000 psi. a. Calculate Initial Oil in Place in stock tank barrels b. Assuming no aquifer influx and no rock compaction what is the expected oil recovery and recovery factor assuming an abandonment reservoir pressure of 1000 psi c. Fill in the following table. Formation Volume Factor and viscosity can be obtained from the table below. The Cumulative recovery can be obtained from the Material Balance equation for Oil Expansion drive. The Production rate can be calculated based on Darcy's law (assume no skin factor and that it is an 8 1/2" (diameter) wellbore). To calculate the "Days taken to produce cumulative recovery" calculate: 1. Oil recovery between current reservoir pressure and previous pressure in the table (Delta Q) 2. Average Oil production rate between current pressure and previous pressure (q) 3. Divide the two to obtain the time taken to produce that amount of oil (Delta Q/ q) 4. Add the time to the time in the previous row. d. To increase oil recovery you decide to conduct the waterflood in the reservoir, based on coreflood data the residual oil saturation is 20%, assuming that 80% of the reservoir is swept, what is the expected recovery factor? Cumulative Production Days taken Years taken to Reservoir Formation recovery Viscosity rate based to produce produce Pressure Volume Factor (from initial cP on single cumulative cumulative psi res bbl/stb pressure) well stb/d MMstb recovery recovery 4000 3500 3000 2500 2000 1500 1000 Problem 3 (10 Marks each part) An oil company is about to start an exploration campaign in one of its acreages. The programme is divided into the following: - G & G studies at a cost of US$ 2.0 million in the Year 1 - A seismic acquisition campaign at a cost of US$10.0 million in Years 2 & 3 - An exploration well will be drilled in Year 4 at a cost of US$ 25.0 - If Successful an appraisal well will be drilled at the beginning of Year 5 at the same cost as the exploration well. - Following the appraisal well, a FDP will be prepared at a cost of US$10.0 million during the 2nd & 3rd quarters of Year 5 - Assuming an FID will be granted for the project by the end of year 5 with a development cost (CAPEX) of US$ 400.0 million over 4 years (US$ 50.0 million in the 1st year followed by US$200.0 million, US$100.0 million and US$50.0 million). - The field will be placed on production for 9 years with the expected net revenues as follows: Year 1 2 3 4 5 6 7 8 9 Revenues 20 100 400 300 200 100 50 20 10 In US$ million The abandonment cost is expected to be US$40 million. Assuming the discount rate is 10% a. Calculate the net present value of (NPV) the project assuming success. b. Calculate the expected NPV of the project if the probability of success is 30%. c. If a very similar project is present in a different country where the expected discount rate is 20%, will you still do the project? Justify your answer. Question 4 (40 Marks) Select one of the following topics 1. The roll of EOS in Reservoir engineering 2. Drilling process Life cycle analysis 3. Logging tools design and usage Develop a 500 word Critical Review of Sources (CROS). This is a kind of essay in which you discuss and summarize the reading (plus listening and video sources) you have done in preparation for the essay. You may be familiar with the term 'literature review', which has a very similar meaning. Your CROS will tell the reader which books and articles they should read, plus what they should listen to or view online - and why. You can also be critical by telling them what they should not read (listen to or view) - and why. You must refer to at least 10 different sources, of which at least 8 should be academic no older than 2011. If you are not sure if a source is academic, try to find it from the University library page, or on Google Scholar. You can make use of readings you have discussed in your classes. All sources should be in English, and referenced according to the APA 6th Edition system. You must include a final reference list (bibliography). You should aim to write 500 words (1.5 Page), excluding the reference list. Divide your work into paragraphs and pay particular attention to accuracy in grammar and vocabulary; if you are not sure of something, check it in a grammar book or dictionary.

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