The present paper describes the running process in horizontal wells and studies the effect of some factors on running forces required to push pipes through curved holes with short to medium radii of curvatures. Estimation of the running forces was performed using a general-purpose finite element program called ANSYS. The effect of pipe bending stiffness, hole radius of curvature, and hole clearance are investigated. Finite element results showed that the pipe bending stiffness becomes insignificant for medium curvatures (i.e., radius of curvature greater than 80 m). It was also found that the running force at the kick-off point (k.o.p) increases as the radius of curvature shortens (severe doglegs) and as the pipe stiffness increases. In addition, FE results revealed that the effect of hole clearance on the running force is negligible.

1.
Aguilera, R., Artindals, J. S., Cordell, G. M., Ng, N. C., Nicholl, G. W., and Runions, G. A., 1991, Contribution in Petroleum and Engineering—Horizontal Wells, Vol. 9, Gulf Publishing Company, TX.
2.
Wu, J., and Juvkam-wold, H. C., 1991, “Drag and Torque Calculation in Horizontal and Extended Reach Wells,” Oil and Gas Journal, April 29, pp. 45–56.
3.
Schuk, F. J., 1991, “Horizontal Well Planning—Build Curve Design,” SPE. Reprint Series No. 33, Horizontal Drilling, SPE, pp. 35–52.
4.
Johancsik, C. A., Friesen, D. B., Dawson, R., 1984, “Torque and Drag in Directional Wells—Prediction and Measurement,” JPT, June, pp. 987–993.
5.
El-Sayed, A. A. H., and Khalaf, F., 1991, “Casing Design Considerations For Horizontal Wells,” Proceedings, Middle East of AIME, pp. 421:428.
6.
Dareing
D. W.
, and
Ahlers
C. A.
,
1991
, “
Tubular Bending and Pull-Out Forces in High-Curvature Well Bores
,”
ASME JOURNAL OF ENERGY RESOURCES TECHNOLOGY
, Vol.
113
, June, pp.
133
139
.
7.
Rocheleau
D. N.
, and
Dareing
D. W.
,
1992
, “
Effect of Drag Forces on Bit Weight in High-Curvature Well Bores
,”
ASME JOURNAL OF ENERGY RESOURCES TECHNOLOGY
, Vol.
114
, Sept., pp.
175
180
.
8.
Timoshenko, S., and Woinowsky-Krieger, S., 1959, Theory of Plates and Shells, 2nd Edition, McGraw-Hill, p. 503.
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