Abstract
Introduction. The World Stress Map project proves that horizontal stress orientation determination is a global task essential for the majority of geomechanical calculations. However, there is scant data on stress orientations in the territory of Russia at the moment. The task is therefore highly relevant. Research objective is to determine the orientations of maximum and minimum horizontal stresses by separate areas of the Tomsk region and build a map of horizontal stresses. Method of research. The basis for determining the orientations of horizontal stresses is the theory of drilling-induced fracture and borehole breakouts occurrence. The maximum stress orientation coincides with the drilling-induced fracture orientation, whereas the minimum stress orientation coincides with the borehole breakouts orientation or is perpendicular to the maximum stresses. Results. Research results are compiled in a summary table containing mean orientations of horizontal stresses by areas and a map of horizontal stress orientations. Conclusions. A summary map of maximum horizontal stress strike azimuths has been constructed. The stresses are of similar orientation in every well under consideration, except for a well in the North-Shingin area. The average value of maximum horizontal stress orientation has made up 337° northwest and 157° southeast.
Highlights
The World Stress Map project proves that horizontal stress orientation determination is a global task essential for the majority of geomechanical calculations
The Archinsky area is represented by three wells, mean orientation of maximum horizontal stresses makes up 340°–350° northwest and 160°–170° southeast, with a standard deviation of not more than 25°, which is rank C of the World Stress Map (WSM) quality ranking
The Archinsky area is represented by three wells, mean orientation of maximum horizontal stresses makes up 340°–350° northwest and 160°–170° southeast, with a standard deviation of not more than 25°, which is rank C of the WSM quality ranking scheme
Summary
To carry out several tasks, namely hydraulic fracturing design development, predicting complications when drilling, designing wellbores, predicting sand production, and building geomechanical models, it is necessary to determine horizontal stresses in the areas of the Tomsk region. Open-source information analysis makes it possible to conclude that data on horizontal stresses in the Tomsk region territory is scant. Most often there is information on separate wellbores in different areas and considered as a quality value for various tasks execution. General data collation on horizontal stress orientation from open sources is presented in paper [2]. Up to 30° deviation of horizontal stress orientation was recorded in several areas. Other papers that use data on horizontal stress orientation prove the orientation from 310° to 350°. Горный журнал», No 7, 2021 fracturing at the Em-Egovsky field; paper [4] uses orientations within the range of 310°. ∑∑∑ ∑∑∑ ∑∑∑ ∑∑∑ wwwwhhhheBeeBeBSBrrrryetyeyeyeasnsSssSiSidiinnnn=ae==eeersssdsii=inia===an1aad111nnnSneSdSdddiviiicicaccaaoaonootnnsisdssidodiiinnnnnCeCeCeesissss==s=sssdu= uuu= i= emi=inimm==m=n1t111emCmmCmCrmiaRiia.iaaRR..tttiti2ii2n2i2ooooennnnd, ,,, tatttihhih=inihs==nn=n1ee1e11eCCrCrrreieeeiiis ss s u2uu2u22l+lllt++tttaaaa n nnnitti=tinit==nn=n1vv11v1vSeeSeSeciccicii tt t to2ooo222r.rrr..iiiissssoooobbbbttttaaaaiiiinnnneeeedddd:::: SSttaannddaarrddddeevviiaattiioonniissddeetteerrmmiinneeddaass
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