Journal of the Japanese Association for Petroleum Technology

Miocene Benthonic Foraminif era from the Iwaf une Formation, Northern Niigata Prefecture

Takehiro SHIRAI

1969 Volume 34 Issue 3 Pages 83-98
Published: 1969
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.34.83

JOURNAL FREE ACCESS

Show abstractHide abstract

This paper reports on the benthonic smaller foraminifera from the Iwaf une formation, Miocene Daishima stage, in northern part of the Niigata oil fields. The Daishima stage smaller foraminifera is hardly studied in Japan.
The benthonic smaller foraminifera occurs only the dark gray shale facies of the lowest Iwafune formation. It is consisted of three faunas as follows: arenaceous, calcareous and mixed faunas. Among them the first one is the main fauna of this formation.
The foraminiferal species of these fauna is similar to that of the Nishikurosawa-lower Funakawa fauna, middle Miocene, in the oil fields of Japan; the characteristic species which indicates the definite horizon of the Daishima stage, is not to be found.
The calcareous fauna is rather similar to that of the recent lower neritic-bathyal zones in the warm water. The arenaceous fauna and the lithofacies of the lowest Iwafune formation show that most of this area was under stagnant condition in the Daishima stage.

View full abstract

Download PDF (1975K)
Penetration Effects of Blade Bit and a Cone Bit

Kiyomitsu FUJII, Mitsuo SATO

1969 Volume 34 Issue 3 Pages 99-104
Published: 1969
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.34.99

JOURNAL FREE ACCESS

Show abstractHide abstract

By the use of a laboratory drilling equipment the penetration effects of both a blade bit and a cone bit were measured under atmospheric pressure. In this study a 3 3/4 in-three wing blade bit and a 3 3/4 in-three cone soft type bit were tested. As rock samples soft andesite and tuff were used. In drilling tests with same bit load and rotary speed the penetration rate of a blade bit was as great as twice as that of a cone bit. To obtain a similar penetration rate of a cone bit, a blade bit needed the reduced load of 60-66% of that given to a cone bit. As a result of analyses of grain size distribution of cuttings, greater grain size was obtained at a lower rotary speed in a test with a cone bit: on the contrary to this, there was no obvious relationship between grain size and rotary speed in a test with a blade bit.

View full abstract

Download PDF (527K)
Study of Pressure Gradients Occuring During Continuous Two Phase Flow

Eishiro ISHIZUKA

1969 Volume 34 Issue 3 Pages 105-114
Published: 1969
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.34.105

JOURNAL FREE ACCESS

Show abstractHide abstract

About this subject various studies haue been made by many investigators. The author tried to find the energy loss of vertical flow dividing it into two parts which are "Slippage loss" and "frction loss" Many equations were made by using field datas, and the solution is by caluculating simultaneous equations. Although this paper is not excellent enough comparing with the previous one, there calculated factors show a few interesting peculiarities.

View full abstract

Download PDF (855K)
[title in Japanese]

[in Japanese]

1969 Volume 34 Issue 3 Pages 115-119
Published: 1969
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.34.115

JOURNAL FREE ACCESS

Download PDF (544K)
[title in Japanese]

[in Japanese]

1969 Volume 34 Issue 3 Pages 120-130
Published: 1969
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.34.120

JOURNAL FREE ACCESS

Download PDF (1147K)

Register with J-STAGE for free!