Presented are theoretical and experimental results from a project supporting development of a new method for cement vibration in well’s annulus to prevent gas migration. In this method, cyclic pressure pulses are applied at the wellhead and transmitted down the annulus. These pulses cause reciprocation and shear within cement column—a process delaying the loss of hydrostatic pressure and preventing the inflow of gas into the well’s annulus. Field tests in real wells conducted to observe transmission of a single pressure pulse and to measure compressibility of setting cement showed that application of pressure pulses of 100 psi amplitude and 0.1 Hz frequency may be an effective and inexpensive way of preventing gas flow after cementing. The paper presents development of a cement pulsation design method based upon the analytical model of pressure propagation in Bingham plastic fluid and experimental data on rheology of cement slurries subjected to continuous shear. The primary objective of the method is to minimize the likelihood of gas invasion into the cement-filled annulus.

Binder, R. C., 1951, Advanced Fluid Dynamics and Fluid Machinery, Prentice Hall, Englewood Cliffs, NJ.
Bourgoyne, A. T. Jr., Chenevert, M. E., Millheim, K. K., and Young, F. S. Jr., 1991, Applied Drilling Engineering, SPE, 2nd Printing.
Chow, T. W., McIntire, L. V., Kunze, K. R., and Cooke, Claude E., 1988, “The Rheological Properties of Cement Slurries: Effects of Vibration, Hydration Conditions, and Additives,” SPE Production Engineering, Nov.
Haberman, J. P., Wolhart, S. L., 1997, “Reciprocating Cement Slurries after Placement by Applying Pressure in the Annulus,” SPE Paper 37619.
Hartog, J. J., Davies, D. R., and Stewart, R. B., 1983, “An Integrated Approach for Successful Primary Cementations,” JPT, Sept.
Manowski, W. M., 1997, “Design Method for Top Cement Pulsation to Prevent Flow after Cementing,” M.S. thesis, Louisiana State University, Baton Rouge, LA.
Raymond, L. R., 1969, “Temperature Distribution in a Circulating Drilling Fluid,” JPT, Mar.
Streeter, V. L., and Wylie, B. E., 1967, Hydraulic Transients, McGraw-Hill, New York, NY.
Sutton, D. L., and Ravi, K. M., 1991, “Low-Rate Pipe Movement During Cement Gelation to Control Gas Migration and Improve Cement Bond,” SPE Paper 22776.
This content is only available via PDF.
You do not currently have access to this content.