巻号一覧
61 巻, 3 号
選択された号の論文の7件中1～7を表示しています
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奥村 清彦, 松木 浩二, 久米 信一, 山方 剛1996 年 61 巻 3 号 p. 211-222
発行日: 1996年
公開日: 2008/03/27
ジャーナル フリーVinyl chloride casing pipes were perforated with high pressure water jet in a pressure vessel to develop an in-situ perforation system. The casing pipes, 73mm in inner diameter and 8mm in thickness, are those used in Chiba Prefecture for natural gas production. Driving pressure of water jet was up to 98.1MPa, and ambient pressure was up to 10MPa which corresponds to the depth of 1, 000m. In addition to a so-called straight nozzle, various horn type nozzles were used to clarify the effects of shape on the performance.
The main conclusions obtained in this study are summarized as follows:
(1) The vinyl chloride casing pipes can be perforated with high pressure water jet up to the depth of 1, 000m if driving pressure is sufficiently high (98.1MPa).
(2) The perforated area becomes maximum at the ambient pressure of 2-3% of the driving pressure.
(3) The maximum ambient pressure under which the pipe can be perforated decreases with standoff distance while the perforated area under low ambient pressure increases with standoff distance.
(4) The horn type nozzle whose half horn angle is from 15°to 35°is much more effective than the straight nozzle. The half horn angle of 15°is the most effective for the perforation of the casing pipe.
(5) The length of horn can be reduced to about four times nozzle diameter without lowering the performance.
(6) The perforated area per unit area of nozzle exit increases with nozzle diameter.
(7) Cavitation is one of the main mechanisms for perforation of the vinyl chloride pipe under high ambient pressure.抄録全体を表示PDF形式でダウンロード (706K) -
三牧 敏太郎, 丸山 和士, 水沼 晋, 井之脇 隆一1996 年 61 巻 3 号 p. 223-230
発行日: 1996年
公開日: 2008/03/27
ジャーナル フリーFor a horizontal well or an extended reach well, which is promising for well construction in future, a casing is subjected to local wear of wall thickness on its inside surface due to contact with tool joint or wireline.
Collapse strength and burst strength of casing having a local wear simulating tool joint wear were well analyzed as an unstable problem by the elastic-plastic finite-element method (FEM) and the decrease ratios of both strengths due to a wear were formulated by nonlinear programming using parameters of the wear shape. The FEM is fully applicable as values calculated agree well with those of experiments having a wear.In the present study, these strengths of casing having two local wears simulating tool joint wear and wireline wear are analyzed by the FEM and following quantitative relations are conducted and formulated.
1. The decrease ratios of these strengths with tool joint wear and with wireline wear superposed are formulated.
2. The influence of wireline wear is a half of that of tool joint wear.
3. When two wears exist, there are threshold values of total wear ratio for collapse strengths and burst strength.抄録全体を表示PDF形式でダウンロード (518K) -
三牧 敏太郎, 丸山 和士, 水沼 晋, 井之脇 隆一1996 年 61 巻 3 号 p. 231-238
発行日: 1996年
公開日: 2008/03/27
ジャーナル フリーA well casing for a horizontal well or an extended reach well is subjected to local wear of wall thickness on its inside surface due to contact with tool joint or wireline.
It is reported that the collapse strength and the burst strength of worn casing are well analyzed as an unstable problem by the finite-element method (FEM) and that the decrease ratios of these strengths due to wear are formulated using FEM simulation results. However, the applicability of formula with two wears is not clarified by comparison with experimental result.
In this paper, the collapse strength with two wears is analyzed by FEM and by the derived formula and is compared with an experimental result of a literature. Furtheremore, the relationship of collapse strength between casing with two wears and casing with uniform weae is analyzed.
Following findings are conducted.
1. The experimental collapse strength of uniformly worn casing was affected by specimen length/outside diameter (L/D). Therefore, the correction due to L/D in the elastic collapse range is necessary.
2. The relation of collapse strength between with two wears and with uniform wear, is determined by yield strength, outside diameter/wall thickness ratio and weae ratio. Namely, the result of literature is one of these relations and is not a general relation.
3. The proposed formula is applicable considering additional FEM results.抄録全体を表示PDF形式でダウンロード (565K) -
出雲谷 聡, 野口 康二1996 年 61 巻 3 号 p. 239-245
発行日: 1996年
公開日: 2008/03/27
ジャーナル フリーIn this paper, we discussed the relationship between velocity and effective porosity with the effects of the clay minerals. The relation between velocity and porosity is shown on the crossplot (Fig. 1); the velocity generally increases as the porosity decreases but the data are so dispersed that we are not able to come up with an equation that exhibits strong linear relation between velocity and porosity. We supposed that the existence of clay is the cause of this dispersion. We determined the area of the data by two equations: one equation expresses the relation between the velocity and porosity for clean sandstone and another expresses the relation between the velocity and effective porosity of 100% clay minerals in the pore space. The effective porosity is moved between two lines.
Using the technique of well log interpretation, we estimate the volume of bound water and show the effects of clay minerals for the relationship between velocity and effective porosity.
The velocities of shale show the effects of velocity reduction due to clay minerals.抄録全体を表示PDF形式でダウンロード (473K) -
原理千田 佶, 榎本 兵治, 米林 英治, 大野 健二1996 年 61 巻 3 号 p. 246-250
発行日: 1996年
公開日: 2008/03/27
ジャーナル フリーMicrobiology is extensively applied to a wide range of engineering fields. Its application to enhance oil recovery has also become an important technology in petroleum engineering. The fundamental concept of microbial enhancement of oil recovery is presented in this paper.抄録全体を表示PDF形式でダウンロード (344K) -
手塚 和彦1996 年 61 巻 3 号 p. 251-259
発行日: 1996年
公開日: 2008/03/27
ジャーナル フリーThis article provides a selected review on recent methods of fracture detection by downhole measurements. Following methods are discussed here: (1) imaging tools of borehole wall, (2) detection of permeable fractures using Stoneley wave propagation, and (3) monitoring of acoustic emission during hydraulic fracturing.抄録全体を表示PDF形式でダウンロード (838K) -
長縄 成実, 尾上 陽一1996 年 61 巻 3 号 p. 260-265
発行日: 1996年
公開日: 2008/03/27
ジャーナル フリーComputer networking has become a critical tool for petroleum engineers. The Computer Sub-Committee of the Drilling Technology Committee has been investigating topics related to the effective utilization of computers and software. In this paper, the effective utilization of the Internet and relevant software are introduced as part of our recent activities.抄録全体を表示PDF形式でダウンロード (514K)
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