ASSESSMENT OF THE PROPENSITY OF WELLS TO DIFFERENTIAL STICKING DURING THE DESCENT OF LINER
UDC: 622.245:519.677:531
DOI: 10.33285/0207-2351-2022-1(637)-42-48
Authors:
PUZANOV DMITRIY N.
1
1 NTC ZERS, Moscow, Russia
Keywords: well, liner, transport string, longitudinal and contact forces, hook weight, formation pressure, hydrostatic pressure
Annotation:
The article offers a simple model for estimating the propensity of wells to the differential sticking during the descent of liner. It is assumed that the additional increase in friction forces between the elements of the liner and the open wellhole is proportional to the product of the contact force and the pressure difference: the hydrostatic pressure of the drilling fluid and the formation pressure. To estimate the propensity of the well to differential sticking, parametric calculations of the liner descent are performed at different values of the proportionality coefficient, the results of which are the coefficient corresponding to the zero weight on the hook when the liner is lowered. For small values of the found coefficient, the well under consideration, together with the configuration of the liner and the transport string, will have a greater tendency to differential sticking. The article considers sixteen different wells selected at random: eight of them had sticking during the descent of the liner, for the other eight wells, the descent of the liner took place without complications. The calculations were performed under the same initial conditions using a new computer program WellForces_1, developed at LLC "NTC ZERS". It is shown that the found values of the proportionality coefficients for wells in which sticking were observed are, on average, significantly less than for wells in which the descent of the liner took place without complications, which makes it possible to determine wells with a high probability of differential sticking in advance. The article also provides a brief analysis of the effectiveness of actions aimed to reducing the probability of differential sticking.
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