Geomechanical properties of the terrigenous reservoirs in the oil fields of Western Ural

Recovery and increase of the productivity of wells of Kashirskiy and Podolskiy reservoirs of the certain Perm region oil field

“…The calculated values of tensions in the expected interval of hydrofracture development interval are fully compliant with the interval from the actual bottom hole closure (Р closure BHP 5 ) to the bottom hole initial shut-in pressure (ISIP), indicating the reliability of the obtained results (Fig. 5) [21][22][23][24][25].…”

Well perforation optimization using an abrasive jet technique to create oriented slotted channels in terrigenous reservoirs

“…Elements of the casing and cement column were not reproduced in the model as they do not have a significant effect on the results of calculations. In such situation, the stress state of the well in the absence of slotted perforation can be calculated analytically [ 5 ]. To verify the correctness of the finite element model, the case without slotted channels is considered.…”

“…Can cause noticeable changes in the stress-strain state in the borehole area of the layer. It is known that the permeability of terrigenous reservoirs depends on the stress state: as effective stresses increase, the permeability of the rock decreases and vice versa [ 2 , 4 , 5 , 7 ]. In addition to increase of the infiltration area of the well, reducing the effective stresses of rocks in the near-wellbore zone can be an additional positive effect from slotted perforation.…”

“…Nevertheless, we should use an opportunity to solve all problems precociously – during the perforation works. Scientists developed effective methods of productive layers perforation in terms of increasing the filtration area of reservoir fluids; considered mechanisms of rocks georethreading (geoloosening) that ensure the casing preservation [ [3] , [4] , [5] , [6] , [7] ], but they have not taken into account the geomechanical assessment of how the different methods of productive layers perforation influence the permeability.…”

Features and the Ability to Replace the Interdependencies between the Acoustic Quality Factor and the Strength of Limestone under the Influence of Different Physical Nature

“…These methods are indirect and use the regression relationship between the strength and other physical properties and characteristics, such as the speed of longitudinal and transverse elastic waves. They were described in papers by Kashnikov et al (2017), Matin et al (2017), Renner et al (2000), and others. It should be noted that the speeds of elastic waves poorly reflect the destruction of rocks in the early stages of their development, which is not conducive to the timely adoption of measures to prevent the catastrophic consequences of failure.…”