This paper presents main results of a shale stability study, related to the understanding of shale/ fluid interaction mechanisms, and discusses shale strength correlation. The major shale/ fluid interaction mechanisms: Capillary, osmosis, hydraulic, swelling and pressure diffusion, and recent experimental results are discussed. Factors affecting the shale strength are discussed, and a sonic com...

Feasibility of drilling with supercritical carbon dioxide to serve the needs of deep underbalanced drilling operations has been analyzed. A case study involving underbalanced drilling to access a depleted gas reservoir is used to illustrate the need for such a research. For this well, nitrogen was initially considered as the drilling fluid. Dry nitrogen, due to its low density, was unable to ge...

Geothermal exploration has been highly successful to date in locating targets for drilling. However, the requirements for an economically successful geothermal well are both high flow rat,e and high temperature. Most geophysical and geochemical exploration methods have not been highly accurate in predicting the depth and actual temperature of a reservoir, nor have they been able to locate high ...

Analysis of the drilling fluid temperature due to heat transfer of drilling fluid with the formation in under-balanced drilling operation is the main objective of this study. Gas-liquid two-phase flow model considering thermal interaction with the formation is used to numerically simulate a well with real dimensions. In the present study, the continuity, momentum, and energy equations are devel...

The problem of development gas hydrate deposits is complicated by a range problems connected with the adaptation traditional methods and procedures to develop mentioned type raw materials. Construction directed well deserve high attention since they are most efficient solution provide stable process fraction production. Experts Dnipro University Technology at top among studies engaged in implem...

The article deals with the selection of fluid solutions used in drilling oil and gas wells. As it is known, increase depth, liquid expands its density decreases. When determining hydrostatic pressure a fluid, recommended to take into account change temperature depending on depth well. To do this, important accurately determine law quality well depends basic physical properties. Thus, reservoir ...