Neftegaz.RU #3-17 ENG

DRILLING
APPLICATION
FEATURES
OF INHIBITING
SOLUTION
During well drilling to prevent
occurrence of instability of the
Kynovian horizon formation
THE RESULTS OF TESTING OF SALT STARCH BIOPOLYMER DRILLING MUD INHIBITED WITH SULFONATED
ASPHALT ARE PROVIDED. THE WORKS ARE CARRIED OUT USING CORE SAMPLES TAKEN IN THE
INTERVAL OF THE FRASNIAN STAGE OF THE DEVONIAN SYSTEMPRESENTS THE RESULTS OF TESTS
INHIBITED MINERALIZED STARCH-BIOPOLYMER DRILLING MUD, INHIBITED SULFONATED ASPHALT.
THE WORK CARRIED OUT USING CORE SAMPLES TAKEN IN THE INTERVAL PRONSKOGO LAYER OF THE
DEVONIAN SYSTEM
UDC 622.244.442
KEYWORDS: inhibition, reservoir, drilling mud, clay deposits, caving formation, sulfonated asphalt.
Tatiana V. Trefilova,
Senior Lecturer
Federal State Budgetary
Educational Institution of
Higher Education "Udmurt
State University",
Oil and Gas Institute named
after M.S. Gutseriyev
Stability of clay deposits is one of
the most urgent problems of drilling,
especially these days, when the
volumes of directional and horizontal
drilling have drastically increased.
Over the past 20 years, researchers
have proposed various criteria
[1, 2, 3], taking into account the
peculiarities of stress condition of
rock formations, including lateral
earth pressure and minimum
horizontal stress.
Methodically, such calculations are
well-thought-out as to date [4]. For
correct geomechanics calculations,
bulk data frame is required (for
example, pressure characteristics
and fracture vectors during hydraulic
fracture, profile logging, data of
electronic micro scanning of walls
of the well). Study of cores from
unstable clay masses are important
for reliability of forecast (including
for determination of their physical
and mechanical characteristics). In
addition to physical and mechanical
characteristics, clay rocks differ
in their mineral composition,
adhesion, pore water salinity; their
characteristics change depending
on depth of formation, conditions of
development etc.
Clays are subject to surface
hydration and bulking, dispersion
in water-base solutions, osmotic
hydration and dehydration,
significant reduce of strength at
hydration, exposure to erosivity of
solution flow.
All clay rocks can be divided into
five classes, each of which is
characterized by a specific set of
physical/chemical properties and
physical/mechanical properties
[5] that determine requirements to
drilling fluids.
Essential condition for stability
of walls of the well is inhibition
of drilling mud that allows for
44 ~ Neftegaz.RU [3]