Borehole wall sloughing analysis method
An analysis method, a technology of wellbore collapse, applied in the field of wellbore stability analysis in strain softening plastic formations and drilling wellbore instability analysis
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[0091] Embodiment 1: Taking the well wall collapse analysis of a well as an example, the present invention is further described in detail.
[0092] Taking Dabei 101 well in Tarim Oilfield as an example, the 1323-1340m well section of the well is analyzed by using the well wall collapse analysis method of the present invention:
[0093]The wellbore collapse analysis method includes: collecting and inputting parameters 1, initial stress treatment 2, first stress release 3, second stress release step 4A, second stress release step 4B, eigenvalue evaluation 5, generalized force and Generalized displacement 6, equilibrium path curve 7, collapse pressure processing 8, output collapse pressure and plastic zone distribution map. refer to figure 1 .
[0094] (A) Firstly, the wellbore rock material parameters, including elastic modulus, Poisson’s ratio, internal friction angle, cohesion, softening coefficient, yield function type, and internal variables, are acquired through the loggi...
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