Neural simulation-based analysis of the well wall stability while productive seam penetrating

Purpose is the development of mathematical models to evaluate deformation of parameters of the rock mass-well geological and engineering system within the anisotropic media. Methods. Both mathematical and neural modeling of a stress state of the rock mass-well system under conditions of geological uncertainty has been applied for the studies. From the viewpoint of mathematical modeling, analysis of probability of factors, complicating drilling, should involve a number of assumptions for strength and deformation characteristics of rock mass layers corresponding to particular hole-making conditions. Findings. A mathematical model of horizontal wellbore and geological layers, occurring along the structure under the conditions of permanent comprehensive stresses, has been developed. An analytical and graphical form has been applied to implement one of the basic aspects of aggregation principles of strength changes in each particular lithological layer for identification of an ideal value of horizontal/inclined wellbore length relative to the rock mass depths scheduled by mining. Regularities of changes in deformation and spatial well stability within the complex reservoirs depending upon various process duties have been determined. A neural simulation-based model has been proposed to analyze deformation of rock mass layers having different strength characteristics. Originality. Interaction between geomechanical characteristics of rock mass as well as deformation and spatial stability of well design has been evaluated both qualitatively and quantitatively. Practical implications. An opportunity has been presented to forecast deformation of well walls taking into consideration different strength as well as structural and geological rock mass characteristics on the basis of neural simulation. The represented approach has been included on the register of the best scientific-based practices according to “Methods to recover low-pressure gas of Cenomanian producing complex” Project.

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An experimental study on anchorage strength and deformation behavior of large-scale jointed rock mass

Tunnelling and Underground Space Technology ◽

10.1016/j.tust.2014.05.006 ◽

2014 ◽

Vol 43 ◽

pp. 184-197 ◽

Cited By ~ 25

Author(s):

H.W. Jing ◽

S.Q. Yang ◽

M.L. Zhang ◽

G.A. Xu ◽

K.F. Chen

Keyword(s):

Experimental Study ◽

Rock Mass ◽

Deformation Behavior ◽

Large Scale ◽

Jointed Rock ◽

Jointed Rock Mass ◽

Strength And Deformation

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Assessment of destressing drilling efficiency using numerical methods: A case-study of Oktyabrsky deposit

Gornyi Zhurnal ◽

10.17580/gzh.2021.02.03 ◽

2021 ◽

pp. 26-31

Author(s):

M. P. Sergunin ◽

T. P. Darbinyan ◽

T. S. Mushtekenov ◽

V. V. Balandin

Keyword(s):

Rock Mass ◽

Theoretical Research ◽

Labor Input ◽

Efficiency Criterion ◽

Strength And Deformation ◽

Low Efficiency ◽

Full Scale Tests ◽

Time Required ◽

Polar Division

Mineral mining in rockburst-hazardous conditions should involve various precautions in compliance with federal regulations and standards. One of the main methods to prevent rock bursts is destressing drilling. In this method, a yielding zone is artificially created. The strength and deformation characteristics in this zone differ from the same characteristics of enclosing rock mass, and redistribution of stresses takes place as a result. Efficiency of destressing drilling is estimated in terms of ore body S-2 in Komsomolsky Mine. The efficiency criterion is selected to be the safety factor of rock mass with and without destressing drilling. Low efficiency of destressing drilling means that this method is readily replaceable by the other techniques of lesser labor input, for example, by reduction in the rate of mining, or by seasoning of underground excavations for some time required for redistribution of stresses to take place. Based on the theoretical research and the conclusions drawn at NorNickel’s Polar Division, the full-scale tests are scheduled for the implementation in order to gradually abandon destessing drilling in rockburst-hazardous Talnakh and Oktyabrsky ore fields. The authors appreciate participation of V. P. Marysyuk from NorNickel’s Polar Division in this study.

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Complex Project Schedule Risk Simulation Based on Multi-agent

Proceedings of the 2018 International Conference on Computer Science, Electronics and Communication Engineering (CSECE 2018) ◽

10.2991/csece-18.2018.24 ◽

2018 ◽

Author(s):

Haolin Wen ◽

Tao Hu ◽

Gongda Yan

Keyword(s):

Project Schedule ◽

Simulation Based ◽

Schedule Risk ◽

Multi Agent ◽

Risk Simulation ◽

Complex Project

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3-D fracture network dynamic simulation based on error analysis in rock mass of dam foundation

Journal of Central South University ◽

10.1007/s11771-018-3794-8 ◽

2018 ◽

Vol 25 (4) ◽

pp. 919-935 ◽

Cited By ~ 1

Author(s):

Deng-hua Zhong ◽

Han Wu ◽

Bin-ping Wu ◽

Yi-chi Zhang ◽

Pan Yue

Keyword(s):

Rock Mass ◽

Error Analysis ◽

Dynamic Simulation ◽

Fracture Network ◽

Network Dynamic ◽

Dam Foundation ◽

Simulation Based

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Determination of Strength and Deformation Properties of Columnar Jointed Rock Mass Using Physical Model Tests

KSCE Journal of Civil Engineering ◽

10.1007/s12205-018-0257-6 ◽

2018 ◽

Vol 22 (9) ◽

pp. 3302-3311 ◽

Cited By ~ 8

Author(s):

Zhinan Lin ◽

Weiya Xu ◽

Wei Wang ◽

Huanling Wang ◽

Rubin Wang ◽

...

Keyword(s):

Rock Mass ◽

Physical Model ◽

Jointed Rock ◽

Jointed Rock Mass ◽

Model Tests ◽

Physical Model Tests ◽

Deformation Properties ◽

Columnar Jointed Rock Mass ◽

Strength And Deformation

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Review and analysis of historical leakages from storage salt caverns wells

Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles ◽

10.2516/ogst/2018093 ◽

2019 ◽

Vol 74 ◽

pp. 27 ◽

Cited By ~ 2

Author(s):

Pierre Bérest ◽

Arnaud Réveillère ◽

David Evans ◽

Markus Stöwer

Keyword(s):

Rock Mass ◽

Pressure Drop ◽

Natural Gas ◽

Ground Surface ◽

Ground Level ◽

Salt Dome ◽

Wellhead Pressure ◽

Well Design ◽

Salt Caverns ◽

Geological Formations

Twelve incidents involving well casing and/or cement leaks in the salt caverns storage industry are described. These incidents occurred at the following storage sites: Eminence salt dome, Mississippi; Elk City, Oklahoma; Conway, Kansas; Yoder, Kansas; Mont Belvieu, Texas; Teutschenthal/Bad Lauchstädt, Germany; Clute, Texas; Mineola, Texas; Hutchinson, Kansas; Magnolia, Louisiana; Boling, Texas; Epe, Germany. Mechanisms leading to a casing leak and consequences are discussed. In most cases, a breach in a steel casing occurred at a depth where a single casing was isolating the stored product from the geological formations. The origin of the breach was due in most cases to poor welding/screwing conditions and corrosion, or excessive deformation of the rock formation. In this, the age of the well is often influential. In many cases, the leak path does not open directly at ground level; fugitive hydrocarbons first escape and accumulate in the subsurface prior to migrating through shallower horizons and escaping at ground surface. A pressure differential between hydrocarbons in the borehole and fluids in the rock mass favours fast leak rates. A wellhead pressure drop often is observed, even when the stored product is natural gas. The incidents described suggest that thorough monitoring (tightness tests) and a correct well design would lessen considerably the probability of a casing leak occurring.

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