ABSTRACT: The creep of multiple thick salt-gypsum formations was severe in the Xinghuo area of the Tarim Basin, and it was difficult to control directional trajectory and drilling fluid density. In this paper, the three-dimensional creep model of composite salt paste layers was established by the finite element method to explore the creep characteristics of salt-gypsum formations in the Xinghuo area. The influence law of well inclination Angle and the Azimuth Angle on the creep of salt-paste layer was analyzed. The study showed that with the increase of deviation angle, the hole shrinkage value first decreased and then increased. With the rise of azimuth angle, the hole shrinkage value increased in both short and long axis directions. When designing the directional well trajectory in the salt gypsum interval, the deviation angle of the salt gypsum interval should be 35˚ ~ 55˚. At the same time, it should be avoided to twist the azimuth when the deviation angle was slight. A reasonable drilling fluid density window was established according to the borehole stability model, which was expected to guide the field formulation of the technical scheme for the safe drilling of giant thick salt-gypsum rock directional borehole in the Xinghuo area.
Skip Nav Destination
Numerical Simulation of Creep In Salt-gypsum Formation of Directional Well In Xinghuo Area
S. H. Du;
Paper presented at the ARMA/DGS/SEG International Geomechanics Symposium, Virtual, November 2021.
Paper Number: ARMA-IGS-21-010
Published: November 01 2021
Du, S. H., Hou, B., and Z. Cui. "Numerical Simulation of Creep In Salt-gypsum Formation of Directional Well In Xinghuo Area." Paper presented at the ARMA/DGS/SEG International Geomechanics Symposium, Virtual, November 2021.
Download citation file:
Don't already have an account? Register