Page 195 - Fundamentals of Enhanced Oil and Gas Recovery

183
Thermal Recovery Processes

Table TP.2 Properties of Steam Injection Well
Injection tubing (ID, in.) 2.99
Injection tubing (OD, in.) 3.50
Casing (OD, in.) 7.0
Casing (ID, in.) 6.276
Hole (in.) 10.75
Depth (in.) 3500

Injection tubing (Btu/h ft F) 24.84
Casing (Btu/h ft F) 24.84

Cement (Btu/h ft F) 0.3
Formation (Btu/h ft F) 1.4

2
Thermal diffusivity of formation (0.04 ft /h) 0.04

Mean subsurface temperature ( F) 77
Geothermal gradient ( F/ft) 0.017

P3. Calculate the steam quality at the wellhead in Problem P2 without insulation of
the production line.
P4. The steam with pressure and temperature of 419 F and 350 psia is injected to

the reservoir by rate of 300 B/D CWE. The characteristic of the casing is 7-in.
(J-55, 26 lbm/ft cemented to surface in a 10 3/4 -in. drill hole). The earth con-
ductivity and mean heat capacity are 1.0 Btu/(h ft F) and 35 Btu/ft Oe, thermal

gradient is 0.015 F/ft. The average temperature of subsurface is 100 F. The
cement conductivity is 0.6 Btu/(h ft 2 F/ft). The wellhead-stem quality is 0.75.
Determine the heat loss of the wellbore after 5 months of injection.
P5. Steam with characteristics of Table TP.2 indicates injected steam properties with
the rate of 1000 B/D CWE. Determine the rate of heat loss and casing tempera-
ture. The annulus of the casing is soil dry through the injection.
1. Determine heat-loss rate and temperature of the casing after 30 days of injec-
tion with pressure of 2500 psi. The quality of steam at wellhead is 89.7%.
2. Recalculate the steam quality at the sandface as pressure change in the tubing is
zero.

REFERENCES
[1] R.F. Meyer, E.D. Attanasi, P.A. Freeman, Heavy oil and natural bitumen resources in geological
basins of the world. Report No.: 2331 -1258.
[2] M. Prats, Thermal Recovery, Society of Petroleum Engineers, United States, 1982. Web.
[3] J. Raicar, R. Procter (Eds.), Economic considerations and potential of heavy oil supply from
Llodminster -Alberta, Canada. In: The Future of Heavy Oil and Tar Sands, Second Internal
Conference. McGraw-Hill, New York, NY, 1984.
[4] P.S. Sarathi, D.K. Olsen, Practical Aspects of Steam Injection Processes: A Handbook for
Independent Operators, National Inst. for Petroleum and Energy Research, Bartlesville, OK, 1992.