Measuring and testing – Borehole or drilling – Downhole test
Patent
1981-08-28
1983-05-10
Birmiel, Howard A.
Measuring and testing
Borehole or drilling
Downhole test
33303, 364422, E21B 47024
Patent
active
043823815
ABSTRACT:
In the production or stimulation of a well, the length change of a string of tubing caused by temperature and pressure is determined for an inclined well. The weight of each section of the tubing is resolved into the axial component applied to the next successive section. For each of the successive sections the buckling force is determined from the actual force and the axial component of weight. This buckling force is compared to a threshold to determine if buckling occurs. The length change of the tubing between the initial condition and the condition of fluid flow in the tubing caused by the pressure and temperature of the fluid and caused by buckling if it is present is determined. An output indicates the change in length of the tubing and the stress applied to the tubing.
REFERENCES:
"Helical Buckling of Tubing Sealed in Packers," A. Lubinski, W. S. Althouse and J. L. Logan, Petroleum Transactions, Jun. 1962, pp. 655-670.
"Movement, Forces, and Stresses Associated With Combination Tubing Strings Sealed in Packers," D. J. Hammerlindl, Feb. 1977, J. of Pet. Tech., pp. 195-208.
"Tubing Movement, Forces, and Stresses in Dual Flow Assembly Installations," Kenneth S. Durham, SPE 9265, Paper presented at the 55th Annual Fall Technical Conference of the Society of Petroleum Engineers of AIME, Dallas, Texas, Sep. 21-24, 1980.
Birmiel Howard A.
Gilman M. G.
Hager G. W.
Huggett C. A.
Mobil Oil Corporation
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