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RESEARCH AND TECHNICAL SERVICES 
Prior to the contractual work, geological, geophysical and technological information on the well is gathered. ..

SCOPE OF THE RESEARCH AND TECHNICAL SERVICES TO BE PROVIDED 
Depending on the Clients needs and required final result, the Research and Production Company SibBurMash can offer the following service options for low invasion coring and core analysis ..

MAJOR TECHNICAL PARAMETERS OF CORE BARRELS ACCORDING TO TU 3664-031-27005283-98 
Core barrels are equipped with centralizers, diameter of which is selected depending on the diameter of the core bit to be used ..

REGULATORY COMMISSION BASIS AND METHODOLOGY USED FOR LOW INVASION CORING 
The order of operations on low invasion coring is summarized in Methodic Guidelines for Low Invasion Coring and Core Analysis. ..

NEW PERSPECTIVE TECHNOLOGIES 
Pressurized core is a core obtained with sealed pressurized core barrels which, after the core is separated from the bottom hole, can provide sealing of the core receiver both in the bottom and top (if necessary). ..

PRESSURIZED CORE

Pressurized core is a core obtained with sealed pressurized core barrels which, after the core is separated from the bottom hole, can provide sealing of the core receiver both in the bottom and top (if necessary). In this way, hydrodynamic communication between the core receiver cavity filled with the core and the well bore is eliminated, and bottomhole pressure is retained. Due to this, when the pressurized core barrel is pulled out to the surface, formation fluid saturation will be retained in the pore space of the core.

It is obvious that pressurized core can provide much more information compared to low invasion core obtained with KIM core barrels, as in addition to preserving the residual water saturation in pressurized core it is possible to preserve oil and gas saturation, and also temperature in case of thermostatic control of the core receiver, due to which the following becomes possible:

  • To determine formation and current values of oil and gas saturation directly from core;
  • To preserve fluid phase composition, this is especially important when coring in gas hydrate pools.

Pressurized coring involves the following:

  • Coring with a pressurized core barrel equipped with special instruments to record thermo-baric parameters in the barrel cavity;
  • Inspection of the core receiver tightness on the surface;
  • Staged degassing of the core receiver, measuring gas rate and taking gas samples for its future analysis;
  • Depressurizing of the core receiver and core extraction;
  • Read-out of the measuring instruments data, their computer processing and interpretation;
  • Core treatment, express-analysis, preparation and preservation of samples.
 

ORIENTED CORING

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The oriented core removal process

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The core with the cuts made over the core height

Considerable interest shown to the oriented coring can be explained by the possibility to obtain valuable information, to determine formation dip, direction of its angle, reservoir characteristics spatial distribution, tendencies for porosity and permeability changing. This will help to verify the pools geological model, to estimate potential oil production, field development plan, etc.

Core is oriented with the help of a special shoe installed below the core catcher; this shoe makes three incisions on the core. One incision will provide the identification; two others are shifted 135 from the first one along the circumference of the core cross-section.

Spatial orientation of the core recovered at the surface can be determined by the results of its paleomagnetic analysis and location of the incisions in relation to the cardinal points (North-South).


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Plugs of the oriented core with the North indication


    NPO "SibBurMash", Tyumen, +7 345 247 2584   nposbm@tmn.ru


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