Lab Report for Enhance oil recovery
EG552C spring 2018 Y. Tanino/A. Sharifi
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Comparing the areal sweep for three polymer concentrations In this lab you will measure the areal sweep during a polymer flood in a square Hele-Shaw cell packed with 2 mm-diameter spheres, your laboratory model of a reservoir. Specifically, you will inject, at constant flow rate Qw = 1.5 mL/min, 1.5 pv of an aqueous polymer solution of concentration C into an oil-saturated packed bed from one corner of the cell and monitor oil production from a production well at the opposite corner. As a class, you will compare three different polymer concentrations (C = 0%, 0.05 wt.% and 0.2 wt.%). Each lab session will comprise three groups of two or three students; each group will be responsible for one C. Key tasks: BEFORE coming to lab:
1. Read this handout. 2. Estimate the mobility ratio for the three C. The viscosities of aqueous xanthan
solutions of C = 0.05 wt.% and 0.2 wt.% have been measured to be µw = 300 mPa s and 2260 mPa s, respectively.
During your lab session: The pore volume of the packed bed will be given to you on the day, but will fall between 70 and 85 mL.
Calculate how many minutes of injection at Qw = 1.5 mL/min correspond to 1.5 pv.
During the polymer flood: Measure the cumulative volume of oil and flood water produced at 10 ~ 15 minute
intervals. Summarize in a table, e.g., time since
start of flood
incremental oil
produced
incremental water
produced
cumulative oil
produced
[min.] [mL] [mL] [pv]
0
Take photos of Hele Shaw cell from above at 10 ~ 15 minute intervals.
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Draw the outline of the polymer front on acetate at 10 ~ 15 minute intervals. Note the break-through time. Place the acetate over graph paper and calculate the areal sweep. Summarize your
results in a table: time since start of
polymer flood swept area fractional area swept
[min.] [number of boxes on graph paper]
[.]
0
After the flood: Before you leave the lab session one member from each group must email me, cc: the other two members of the group:
a table of cumulative oil produced vs time for your group in Excel. a photocopy of the acetate with the outline of the polymer fronts at selected times. a table of swept area vs time for your group in Excel.
I will compile the results and post them on MyAberdeen so that everyone has access to data collected by the other two groups in their lab session.
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Outline for lab report 1. Title, date of lab session, and your name at the top of first page. 2. Concise statement of the objective of the exercise.
Pre-lab 3. Your answers to task 2 in the pre-lab exercise.
Methods 4. Record experimental setup and procedure in sufficient detail that you could recreate
the experiment ten years hence. Include a schematic. 5. Describe concisely how you extracted areal sweep efficiency from your
measurements.
Results 6. Selected photos for the C your group considered. 7. For the three C from your lab session:
Outlines of the polymer front at the selected times. Plot of cumulative oil recovery as a function of time. Plot of areal sweep efficiency as a function of time.
Discussion. Use complete sentences – clarity counts! 8. Compare and contrast the shape of the front, the sweep, and the oil recovery for the
three C. 9. Explain any differences and trends. What properties control the differences in
displacement behaviour? Hint: you may assume that the oil has a kinematic viscosity and density of 73.45 mm2/s and 0.9169 g/cm3, respectively, at room temperature (Esteban et al., 2012).
Acknowledgements. 10. State the names of the other students in your group, and their contribution to the
laboratory activity. Acknowledge the contributions from the other two groups in your session.
References B. Esteban, J.-R. Riba, G. Baquero, A. Rius, R. Puig (2012) Temperature dependence of density and viscosity of vegetable oils, Biomass and Bioenergy 42:164-171. doi: 10.1016/j.biombioe.2012.03.007. Submission instructions
Your report should be no more than 12 pages Use a font size of 11. Do not include a cover page, a table of contents, or a list of symbols.
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Please do NOT bind the hard copy. Attach to the front of the hard copy report a signed plagiarism cover sheet for
‘continuously assessed individual work’ available on MyAberdeen under Plagiarism Cover Sheets.
Method of submission: ONE hard copy: submission box outside the Undergraduate Office (FN192) Electronic submission via MyAberdeen > Continuous Assessment.
Deadline for the submission of your report is NOON one week after your respective
lab sessions, which are posted under Course Timetable on the MyAberdeen page for this course.