Journal of the Japanese Association for Petroleum Technology

An Experimental Study of Effect of Velocity on Mud Displacement in Primary Cementing

Shoichi TANAKA, Masashi MIYAZAWA

1972 Volume 37 Issue 1 Pages 1-7
Published: 1972
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.37.1

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To clarify the effect of the velocity of cement slurry on the displacement of mud, experiments are carried out with a concentric and an eccentric arrangements of pipes of a 2m length, a 45mm inner diameter outer pipe and a 27.1mm outer diameter inner pipe. Electrodes of a 5mm diameter are set on the pipes at several places and used to measure electric resistances of fluids between the pipes. The movement of the interface between mud and cement slurry are traced by the change of the resistances. Following results are obtained.
(1) with the concentric annulus. The velocity of cement slurry has the effect on the coefficient of displacement of mud. The slower the velocity of cement slurry, the better the displacement coefficient of mud. A 1.2 times annular volume of cement slurry is necessary to obtain a good cementing regardless of the velocity of cement slurry.
(2) with the eccentric annulus. The cement slurry tends to flow easily and fast in the wide section of the eccentric annulus, and the mud in the narrow section is difficult to remove. The displacement of mud in the narrow section is dependent upon the velocity of cement slurry. The higher the velocity of cement slurry, the better the displacement. It is satisfactory in order to obtain a good cementing to send a 1.5 times annular volume of cement slurry at the high velocity, and a 2 times annular volume of cement slurry or more is necessary at the low velocity of cement slurry.

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Sedimentary Geochemistry in the Region of Hydrocarbon Deposits

Koji MOTOJIMA

1972 Volume 37 Issue 1 Pages 8-13
Published: 1972
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.37.8

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Oil and natural gas deposits exist in the sedimentary basins having various sedimentary environments. Some Soviet scientists use the following lithogenetic stages; diagenesis, proto-catagenesis, meso-catagenesis, apo-catagenesis and metamorphism. These classified stages are convenient to the geochemical study of hydrocarbon deposits.
Table 1 shows the relation among the lithogenetic stages and other geologic characteristics, such as geostatic pressure, temperature, rank of coal, absolute age, clay mineral, bituminoids, iodine, hydrocarbons and chemical type of groundwaters.
After the geochemical examinations of hydrocarbon deposits in Japan and other regions in the world, the author noticed that at the later apo-catagenesis stage the characters of clay minerals, bituminoids and groundwaters were changed greatly. The approximate absolute ages of the stage are n x 10⁷ years in Japan and n x 10⁸ years in the platform areas in the world.
These phenomena are important for the geochemical exploration of natural gas and oil deposits as well as for the geochemical research works.

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[title in Japanese]

[in Japanese]

1972 Volume 37 Issue 1 Pages 14-22
Published: 1972
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.37.14

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[title in Japanese]

[in Japanese]

1972 Volume 37 Issue 1 Pages 23-28
Published: 1972
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.37.23

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[title in Japanese]

[in Japanese]

1972 Volume 37 Issue 1 Pages 29-31
Published: 1972
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.37.29

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1972 Volume 37 Issue 1 Pages 32-34
Published: 1972
Released on J-STAGE: March 27, 2008

DOIhttps://doi.org/10.3720/japt.37.32

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