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Workreport 1997-22

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Name:

Syväkairaus HH-KR3 Loviisan Hästholmenilla vuonna 1997

Writer:

Risto Niinimäki

Language:

Finnish

Page count:

152

Summary:

Working report: CORE DRILLING OF DEEP BOREHOLE HH-KR3 AT HÄSTHOLMEN IN
LOVIISA

ABSTRACT

At the beginning of the year 1997 Hästholmen in Loviisa was selected as the fourth
investigation site after a feasibility study performed in 1996. The detailed site
investigations will be carried out during years 1993...2000

As a part of the investigation programme Suomen Malmi Oy extented the borehole Y7
from 202,30 to 803.35 m at Hästholmen in May-June 1997. The diameter of the old
borehole is 66 mm. The upper part to the depth of 40.28 m was reamed to a diameter of
165 mm and equipped with a casing with a diameter of 140/130 mm. The diameter of
the extented part is 56 mm. The new identification code of the borehole is HH-KR3.

A set of control measurements and the sampling of the flushing water were carried out
during the drilling. Both the volume and the conductivity of the flushing water and the
returning water were recorded as well as the pressure of the fushing water. The
objective of these measurements was to obtain more information from bedrock and
groundwater. Uranine was used as a label agent in the flushing water. The volume of
the used flushing water was about 285 m³ and the volume of the returning water was
about 42 m³. At the end of the work the borehole was flushed by pumping about 14 m³
of water from the bottom of the borehole. The deviation of the borehole was measured
with the deviation instruments Reflex - Maxibor and Boremac D2. The results of the
Maxibor measurement indicate that the borehole deviates 8.24 m to the left and 2.32 m
down at the depth of 798 m.

Core samples were photographed and they were logged by a geologist at the site.
Uniaxial compressive strength, Young`s modulus and the Poisson`s ratio were
measured from the core samples. The main rock type is rapakivi granite consisting of
various types, of which the majority is homogenious rapakivi granite. Fractures are
mostly filled or tight. The average fracture frequenc is 3.23 pcs/m. The borehole
penetrated 15 broken zones. The total length of the broken zones is 54.29 m, which is
9.0 % of the total core length.

Keywords: core drilling, borehole, fracture, rapakivi granite, control measurements,
elastic parametres, deviation measurements
CORE DRILLING OF DEEP BOREHOLE HH-KR3 AT HÄSTHOLMEN IN
LOVIISA

ABSTRACT

At the beginning of the year 1997 Hästholmen in Loviisa was selected as the fourth
investigation site after a feasibility study performed in 1996. The detailed site
investigations will be carried out during years 1993...2000

As a part of the investigation programme Suomen Malmi Oy extented the borehole Y7
from 202,30 to 803.35 m at Hästholmen in May-June 1997. The diameter of the old
borehole is 66 mm. The upper part to the depth of 40.28 m was reamed to a diameter of
165 mm and equipped with a casing with a diameter of 140/130 mm. The diameter of
the extented part is 56 mm. The new identification code of the borehole is HH-KR3.

A set of control measurements and the sampling of the flushing water were carried out
during the drilling. Both the volume and the conductivity of the flushing water and the
returning water were recorded as well as the pressure of the fushing water. The
objective of these measurements was to obtain more information from bedrock and
groundwater. Uranine was used as a label agent in the flushing water. The volume of
the used flushing water was about 285 m³ and the volume of the returning water was
about 42 m³. At the end of the work the borehole was flushed by pumping about 14 m³
of water from the bottom of the borehole. The deviation of the borehole was measured
with the deviation instruments Reflex - Maxibor and Boremac D2. The results of the
Maxibor measurement indicate that the borehole deviates 8.24 m to the left and 2.32 m
down at the depth of 798 m.

Core samples were photographed and they were logged by a geologist at the site.
Uniaxial compressive strength, Young`s modulus and the Poisson`s ratio were
measured from the core samples. The main rock type is rapakivi granite consisting of
various types, of which the majority is homogenious rapakivi granite. Fractures are
mostly filled or tight. The average fracture frequenc is 3.23 pcs/m. The borehole
penetrated 15 broken zones. The total length of the broken zones is 54.29 m, which is
9.0 % of the total core length.

Keywords: core drilling, borehole, fracture, rapakivi granite, control measurements,
elastic parametres, deviation measurements

Keywords:

kairaus; kairanreikä; rako; rapakivigraniitti; tarkkailumittaukset; muodonmuutosominaisuudet; sivusuuntamittaus

File(s):

Syväkairaus HH-KR3 Loviisan Hästholmenilla vuonna 1997 (pdf) (4.2 MB)


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