GB1321271A - Cement evaluation logging utilizing reflection co-efficients - Google Patents
Cement evaluation logging utilizing reflection co-efficientsInfo
- Publication number
- GB1321271A GB1321271A GB3343870A GB3343870A GB1321271A GB 1321271 A GB1321271 A GB 1321271A GB 3343870 A GB3343870 A GB 3343870A GB 3343870 A GB3343870 A GB 3343870A GB 1321271 A GB1321271 A GB 1321271A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acoustic
- signals
- cement
- bands
- reflection coefficient
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000004568 cement Substances 0.000 title abstract 7
- 238000011156 evaluation Methods 0.000 title abstract 4
- 230000015572 biosynthetic process Effects 0.000 abstract 3
- 238000005755 formation reaction Methods 0.000 abstract 3
- 238000001228 spectrum Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000001914 filtration Methods 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 238000012856 packing Methods 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
- G01V1/44—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging using generators and receivers in the same well
- G01V1/48—Processing data
- G01V1/50—Analysing data
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/005—Monitoring or checking of cementation quality or level
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Quality & Reliability (AREA)
- Geochemistry & Mineralogy (AREA)
- Acoustics & Sound (AREA)
- Remote Sensing (AREA)
- General Physics & Mathematics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Current Or Voltage (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
1321271 Acoustic inspection devices SCHLUMBERGER INLAND SERVICES Inc 9 July 1970 [9 July 1969] 33438/70 Heading H4D The integrity of the cement packing between a well casing and surrounding earth formations is investigated by transmitting acoustic energy so that a component propagates from the well bore into the casing and earth formations, receiving a reflected portion of the energy and separating it into acoustic frequency spectrum bands, and generating signals respectively representing the acoustic reflection coefficient in at least three selected spectrum bands. It is shown mathematically that, for a given well casing and borehole size, three frequency bands can be selected such that the reflection coefficients for two of the bands would be relatively low if there were good cementing, while at most one reflection coefficient would be relatively low for poor cementing. In the embodiment of Figs. 6 and 7 a conventional logging tool (Fig. 6) has several acoustic pulse transmitters and receivers T, R which can be selected in pairs by means of programmer 36, control signal generator 34, selector control 54 and selector unit 56. The tool is constructed substantially to prevent direct passage of acoustic energy between the transmitters and receivers. Receiver output signals are passed via channel 60 (which is blanked during the acoustic pulse transmission) and detector 42 (which is gated on when acoustic signals are expected to reach a receiver via the earth formations, cement and well easing) to acoustic travel time computer 44 and to cement evaluation computer 70, the computer outputs being logged at 52 and 71 as a function of tool depth in the well. In the cement evaluation computer (Fig. 7) the time-gated receiver signals are split into the three selected frequency bands (e.g. 10-15 kHz, 15-25 kHz and 25-40 kHz) by filters 81, 82, 83 whose amplified outputs are integrated (with respect to frequency) respectively at 87, 88, 89 to provide three signals of amplitude representing the reflection coefficients in those bands. Selectable gain amplifiers 84, 85, 86 compensate for the frequency response of the logging tool transducers. Circuit 90 (detailed in Fig. 9, not shown) selects the lowest two of the three reflection coefficient signals and averages them, this average being logged. The reflection coefficient signals are recorded individually at 91. The cement evaluation computer may be operated off-line, by recording on magnetic tape the logging tool acoustic waveforms or the outputs of integrators 87, 88, 89, and may be a digital filtering and processing system instead of the system shown (details given). The cement integrity log may be displayed on an oscilloscope or recorded by a digital printer.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84033569A | 1969-07-09 | 1969-07-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1321271A true GB1321271A (en) | 1973-06-27 |
Family
ID=25282072
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3343870A Expired GB1321271A (en) | 1969-07-09 | 1970-07-09 | Cement evaluation logging utilizing reflection co-efficients |
Country Status (8)
Country | Link |
---|---|
JP (1) | JPS5028881B1 (en) |
AR (1) | AR196181A1 (en) |
DE (1) | DE2033721A1 (en) |
EG (1) | EG10392A (en) |
FR (1) | FR2063127B1 (en) |
GB (1) | GB1321271A (en) |
NL (1) | NL7010129A (en) |
RO (1) | RO75747A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2154320A (en) * | 1984-02-07 | 1985-09-04 | Shell Int Research | Downhole fracture analysis |
CN105298482A (en) * | 2015-10-19 | 2016-02-03 | 中国石油天然气集团公司 | Method for separating near-shaft structure reflected wave and shaft wall direct wave |
WO2018064170A1 (en) * | 2016-09-27 | 2018-04-05 | General Electric Company | Apparatus and method for determining well integrity |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU537277B2 (en) * | 1978-10-30 | 1984-06-14 | Schlumberger Technology B.V. | Subsurface porosity test |
CN109507298B (en) * | 2018-12-14 | 2023-09-29 | 中国特种设备检测研究院 | Acoustic wave detection equipment for detecting cementing quality of cement protection layer of gas storage well |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2894597A (en) * | 1954-11-01 | 1959-07-14 | Jersey Prod Res Co | Acoustic well logging apparatus |
FR1299914A (en) * | 1961-09-08 | 1962-07-27 | Prakla Gmbh | Method and installation for exploring tube-lined boreholes with sound waves |
US3265151A (en) * | 1962-06-15 | 1966-08-09 | Halliburton Co | Means and techniques useful in establishing quality of cement bonds in cased boreholes |
US3275978A (en) * | 1963-03-01 | 1966-09-27 | Exxon Production Research Co | Seismic signal processing by equalization of frequency components of a seismic signal |
-
1970
- 1970-07-08 AR AR229891A patent/AR196181A1/en active
- 1970-07-08 RO RO7063859A patent/RO75747A/en unknown
- 1970-07-08 DE DE19702033721 patent/DE2033721A1/en active Pending
- 1970-07-09 NL NL7010129A patent/NL7010129A/xx unknown
- 1970-07-09 FR FR7025444A patent/FR2063127B1/fr not_active Expired
- 1970-07-09 GB GB3343870A patent/GB1321271A/en not_active Expired
- 1970-07-09 JP JP45060259A patent/JPS5028881B1/ja active Pending
- 1970-11-12 EG EG302/70*[A patent/EG10392A/en active
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2154320A (en) * | 1984-02-07 | 1985-09-04 | Shell Int Research | Downhole fracture analysis |
US4587641A (en) * | 1984-02-07 | 1986-05-06 | Shell Oil Company | Downhole fracture analysis |
CN105298482A (en) * | 2015-10-19 | 2016-02-03 | 中国石油天然气集团公司 | Method for separating near-shaft structure reflected wave and shaft wall direct wave |
CN105298482B (en) * | 2015-10-19 | 2018-06-01 | 中国石油天然气集团公司 | The separation method of construction back wave and borehole wall direct wave by a kind of well |
WO2018064170A1 (en) * | 2016-09-27 | 2018-04-05 | General Electric Company | Apparatus and method for determining well integrity |
Also Published As
Publication number | Publication date |
---|---|
DE2033721A1 (en) | 1971-01-21 |
NL7010129A (en) | 1971-01-12 |
AR196181A1 (en) | 1973-12-10 |
FR2063127B1 (en) | 1974-02-01 |
JPS5028881B1 (en) | 1975-09-19 |
FR2063127A1 (en) | 1971-07-09 |
RO75747A (en) | 1981-02-28 |
EG10392A (en) | 1976-03-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |