Databank

Workreport 1997-10

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Name:

Syväkairaus HH-KR1 Loviisan Hästholmenilla vuonna 1997

Writer:

Tauno Rautio

Language:

Finnish

Page count:

184

Summary:

Working report: CORE DRILLING OF DEEP BOREHOLE HH-KR1 AT HÄSTHOLMEN IN
LOVIISA

ABSTRACT

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 core drilled a 1002.13 m
deep borehole with a diameter of 56 mm in spring 1997 at Hästholmen. The
identification number of the borehole is HH-KR1.

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 flushing 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 292 m³ and the volume of the returning water was about 184 m³. In
connection with water sampling the volume of 84 m³ of water was pumped from the
borehole. At the end of the work the borehole was flushed by pumping about 28 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 37.68 m to the right and 93.68 m up at
the depth of 977 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 core samples. The main rock type is rapakivigranite consisting of various types.
Fractures are mostly tight. However, in broken zones filled fractures are dominating. The
average fracture frequency is 1.91 pcs/m. The borehole penetrated 19 broken zones. The
total length of the broken zones is 23.09 m, which is 2.3 % of the total core length.

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








2
CORE DRILLING OF DEEP BOREHOLE HH-KR1 AT HÄSTHOLMEN IN
LOVIISA

ABSTRACT

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 core drilled a 1002.13 m
deep borehole with a diameter of 56 mm in spring 1997 at Hästholmen. The
identification number of the borehole is HH-KR1.

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 flushing 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 292 m³ and the volume of the returning water was about 184 m³. In
connection with water sampling the volume of 84 m³ of water was pumped from the
borehole. At the end of the work the borehole was flushed by pumping about 28 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 37.68 m to the right and 93.68 m up at
the depth of 977 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 core samples. The main rock type is rapakivigranite consisting of various types.
Fractures are mostly tight. However, in broken zones filled fractures are dominating. The
average fracture frequency is 1.91 pcs/m. The borehole penetrated 19 broken zones. The
total length of the broken zones is 23.09 m, which is 2.3 % of the total core length.

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








2

Keywords:

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

File(s):

Syväkairaus HH-KR1 Loviisan Hästholmenilla vuonna 1997 (pdf) (5.4 MB)


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