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Date submitted2018-11-18
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Date accepted2019-01-17
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Date published2019-04-23
Calculation of elastoviscoplastic displacement of well walls in transversal and isotropic rocks
- Authors:
- A. G. Gubaidullin
- A. I. Moguchev
The relevance of the work is justified by the need to improve the technical and economic indicators of well construction based on forecasting and preventing drilling tools sticking due to the narrowing of an open well bore in the intervals of transversely isotropic rocks. A mathematical model of elastic-viscous-plastic displacement of the walls of inclined and horizontal wells has been developed during the narrowing of the open borehole due to rock creep in the intervals of transversely isotropic rocks. In the program developed based on this mathematical model, the calculation of the elastic-viscous-plastic displacement of the walls of an obliquely directed and horizontal well in the reservoir of argillite from the Western Siberia deposit was carried out. As a result of the calculation, it was established that after opening the rock with bits, the cross-section of the open borehole due to the rock creep eventually takes the form of an ellipse, the small axis of which is in the plane of the upper wall of the well and decreases with time.
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Date submitted2015-07-08
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Date accepted2015-09-08
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Date published2016-02-24
The anomaly of iron plasticity as a result of transformation at ~ 650 ºC
- Authors:
- K. Yu. Shakhnazarov
- E. I. Pryakhin
On the basis of six signs of the trip-effect, thermal effect as a result of four independent piec-es of researches, magnetic effect (diffusion change, as in the point of Curie), changes in hydrogen and carbon solubility and two dozens of anomalies based on temperature dependences of physical properties, conversion in iron at ~ 650ºC has been proven. The transformation enables to explain extreme products properties obtained as a result of isothermal transformation of austenite, step tempering, martensite vacation, anomalously high diffusion, appearance of stimulus to austenite recrystallization and other.