is well known that CORE is a major source of information on rock properties.
As CORE provides visual and direct study of rocks, it can give 70-80%
of the total information provided in the course of exploratory operations.
till recent time such level of information could be obtained only
when coring was performed with oil-base mud which was considerably
more expensive, fire hazardous and dangerous to the environment compared
to water-base mud. Still, until recently, following the requirements
of the State Commission on Reserves (SCR), oil companies had to use
oil-based mud for coring in reservoir evaluation (appraisal) wells.
to find alternative methods providing for use of water-based mud and
complying with the SCR requirements, specialists of the Research and
Production Company SibBurMash have developed special technologies
for drilling and coring with water-base mud. These technologies exclude
the negative effect of using water-base mud, minimize mud filtration
into the core sample and preserve formation water saturation Sw in
its pore space.
order to achieve the above mentioned aims, a series of core barrels
KIM of different standard sizes has been developed. With these core
barrels it is possible to obtain cores providing improved information
content, i.e. having preserved structure and texture, maximum possible
preservation of the initial fluid saturation and core recovery of
not less than 90% (not less than 75% from unconsolidated formations).
This improved information level is provided also by the advanced technologies
for on-site core express-analysis and processing, and by appropriate
core study techniques developed jointly by the Tyumen research and
development companies SibBurMash, SibCor and Tyumengeophysica.
basic concept of their field services is “Core quality should provide
solutions for geological tasks”.
concept is realized by the offered research, design work and services.