Horizontal wells have become a popular alternative for the development of hydrocarbon fields around the world because of their high flow efficiency caused by a larger contact area made with the reservoir. Most of the analytical work done in the past on horizontal productivity either assumed that the well is infinitely conductive or the flow is uniform along the entire well length. The infinite conductive assumption is good only when the pressure drop in the wellbore is very small compared to the drawdown in the reservoir otherwise the pressure drop in the wellbore should be taken into account. In this paper, an improved predictive model that takes into account the effect of all possible wellbore pressure losses on productivity index of long horizontal well was developed. Results show that the discrepancies in the predictions of the previous models and experimental results were not only due to effect of friction pressure losses as opined by Cho and Shah but may also be due to all prominent pressure losses such as kinetic change and fluid accumulation experienced by the flowing fluid in a conduit. The effect is most pronounced at the early production time where initial transience at the onset of flow is experienced.

References

References
1.
Renard
,
G. I.
, and
Duppy
,
J. M.
, 1990, “
Influence of Formation Damage on the Flow Efficiency of Horizontal Wells
,”
Presented at the Formation Damage Control Symposium
, Lafayette, Louisiana, February 22–23, SPE Paper No. 19414.
2.
Novy
,
R. A.
, 1995, “
Pressure Drops in Horizontal Wells: When can They be Ignored
?”
SPE Reservoir Eng.
, pp.
29
35
.
3.
Folefac
,
A. N.
,
Archer
,
J. S.
,
Issa
,
R. I.
, and
Arshad
,
A. M.
, 1991 “
Effects of Pressure Drop Along Horizontal Wellbores on Well Performance
,”
Presented at the Offshore Europe Conference
, Abordeen, September 3–6, SPE Paper 23094.
4.
Dikken
,
B. J.
, 1990 “
Pressure Drop in Horizontal Wells and Its Effects on Production Performance
,”
JPT
, pp.
1426
1433
.
5.
Giger
,
F. M.
, 1987, “
Low-Permeability Reservoirs Development Using Horizontal Wells
,”
SPE Paper presented at the SPE/DOE Low Permeability Reservoirs Symposium
, Denver, Colorado, May 18–19.
6.
Joshi
,
S. D.
, 1998 “
Augmentation of Well Productivity Using Slant and Horizontal Wells
,”
JPT
, pp.
729
739
.
7.
Mutalik
,
P. N.
,
Godbole
,
S. P.
, and
Joshi
,
S. D.
, 1988, “
Effect of Drainage Area Shapes on Horizontal Well Productivity
,”
Presented at the SPE 63rd Annual Technical Conference
, Houston, Texas, October 2–5, SPE Paper No. 18301.
8.
Davian
,
F.
,
Raghavan
,
R.
, and
Joshi
,
S. D.
, 1989, “
Horizontal-Well Pressure Analysis
,”
SPE Form. Eval.
, pp.
567
575
.
9.
Odeh
,
A. S.
, and
Babu
,
D. K.
, 1990, “
Transient Flow Behavior of Horizontal Wells: Pressure Drawdown and Buildup Analysis
,”
SPE Form. Eval.
, pp.
7
15
.
10.
Ozkan
E.
,
Sarica
,
C.
, and
Haciislamoglu
M.
, 1995, “
Effect of Conductivity on Horizontal Well Pressure Behavior
,”
SPE Adv. Tech. Ser.
,
3
(
1
), pp.
85
93
.
11.
Penmatcha
,
V. R.
,
Arbabi
,
S.
, and
Aziz
,
K.
, 1997, “
Effects of Pressure Drop in Horizontal Wells and Optimum Well Length
,”
Presented at 1997 SPE Production Operations Symposium
, Oklahoma City, Oklahoma, March 9–11, SPE Paper 37494.
12.
Landman
,
M. J.
, 1994, “
Analytical Modeling of Selectively Perforated Horizontal Well
J. Pet. Sci. Eng.
, pp.
179
188
.
13.
Cho
,
H.
and
Shah
,
S. N.
, 2000, “
Optimization of Well Length for Horizontal Drilling
”,
IPC Paper 2000-27 presented at the Petroleum Society’s Canada International Petroleum Conference 2000
, Calgary, Canada.
14.
Cho
,
H.
and
Shah
,
S. N.
, 2001, “
Predition of Specific Productivity Index for Horizontal Wells
”,
Presented at SPE International Petroleum Conference 2001
, Oklahoma, March 24–27, SPE Paper No. 67237.
15.
Borisov
,
J. P.
, 1964,
Oil Production Using Horizontal and Multiple Deviation Wells
,
Nedra, Moscow
, Translated by
J.
Stauss
and
S. D.
Joshi
, eds.,
Phillips Petroleum Co.
, the R & D Library Translation, Bartlesville, Oklahoma, 1984.
16.
Cho
,
H.
and
Shah
,
S. N.
, 2001, “
Integrated Optimization on Well Length for Horizontal Drilling
”,
Presented at SPE International Petroleum Conference 2001
, Dallas, Texas, April 2–3, SPE Paper 68599.
17.
Adekomaya
,
O.
,
Fadairo
A.
, and
Falode
O.
, 2008, “
Predictive Tool for Bottom-hole Pressure in Multiphase Flowing Wells
,”
J. Pet. Coal
,
50
, pp.
60
66
.
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