Experimental Study of the Effect of Anisotropy on the Orientation of Breakouts in Wellsстатья
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Дата последнего поиска статьи во внешних источниках: 26 января 2024 г.
Аннотация:On rock samples taken from the Cenomanian horizon of the PK1 formation of the gas andgas condensate fields of the Arctic shelf of Russia, direct physical modeling of the formation under theaction of equal component stresses of breakouts in wells directed along the normal and along theoccurrence was carried out. In the first case, the shape of the breakouts was cylindrical, and in the secondcase, in the form of two caverns. Such a form of breakouts, when interpreting well logging, is usuallyassumed to be caused by an unequal component stress field, which obviously does not correspondto the results of the experiments. Independent experiments were also carried out to determine theanisotropy of the elastic and strength properties of the studied rock. It was found that the studied rockhas a specific type of strength anisotropy, not directly related to the weakening along the bedding. It isshown that this type of strength anisotropy can lead to the formation of breakouts of the observedshape. The main purpose of the article is to draw attention to the fact that stress anisotropy is not necessarilythe main or only cause of the observed breakouts in wells. The results can be used in the designand development of hydrocarbon fields and underground gas storages, as well as in the interpretationof well measurements to determine the natural stress field in the Earth’s crust.