Difference between revisions of "Borehole gravity: uses, advantages, and disadvantages"
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FWhitehurst (talk | contribs) m (FWhitehurst moved page Basics of borehole gravity to Borehole gravity: uses, advantages, and disadvantages: most important term first, plus was inaccurate) |
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| part = Predicting the occurrence of oil and gas traps | | part = Predicting the occurrence of oil and gas traps | ||
| chapter = Applying gravity in petroleum exploration | | chapter = Applying gravity in petroleum exploration | ||
| − | | frompg = 15- | + | | frompg = 15-16 |
| − | | topg = 15- | + | | topg = 15-16 |
| author = David A. Chapin, Mark E. Ander | | author = David A. Chapin, Mark E. Ander | ||
| link = http://archives.datapages.com/data/specpubs/beaumont/ch15/ch15.htm | | link = http://archives.datapages.com/data/specpubs/beaumont/ch15/ch15.htm | ||
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==Borehole gravity uses== | ==Borehole gravity uses== | ||
| − | Borehole gravity is especially effective for the following exploration and production purposes: | + | Borehole [[gravity]] is especially effective for the following exploration and production purposes: |
'''Exploration purposes''' | '''Exploration purposes''' | ||
| − | * Locating nearby salt | + | * Locating nearby [[salt structure]]s |
| − | * Locating distance to nearby structures (e.g., | + | * Locating distance to nearby structures (e.g., [[reef]]s) for [[step-out]]s and [[sidetrack]]s |
* Better [[synthetic seismogram]]s | * Better [[synthetic seismogram]]s | ||
'''Production purposes''' | '''Production purposes''' | ||
| − | * Measuring bulk density when radioactive tools are too risky | + | * Measuring [[Basic_open_hole_tools#Density|bulk density]] when radioactive tools are too risky |
| − | * Logging cased holes for lithologic changes | + | * [[Basic cased hole tools|Logging cased holes]] for lithologic changes |
| − | * Calculating overburden for hydrofracture jobs | + | * Calculating [[overburden]] for [[hydrofracture]] jobs |
| − | * Monitoring injection | + | * Monitoring [[injection fluid]]s |
* Monitoring reservoirs during fluid withdrawal | * Monitoring reservoirs during fluid withdrawal | ||
* Exploring for bypassed, behind-casing gas zones | * Exploring for bypassed, behind-casing gas zones | ||
| Line 37: | Line 37: | ||
The following characteristics give [[borehole gravity]] surveys advantages in certain situations: | The following characteristics give [[borehole gravity]] surveys advantages in certain situations: | ||
| − | * Directly measures bulk density | + | * Directly measures [[Basic_open_hole_tools#Density|bulk density]] |
* Is a deep imaging tool | * Is a deep imaging tool | ||
* Is effective in both cased and uncased wells | * Is effective in both cased and uncased wells | ||
| − | * Is unaffected by | + | * Is unaffected by [[washout]]s, [[hole rugosity]], or [[mud invasion]] effects |
| − | * Can help determine seismic wavelet scale density | + | * Can help determine [[seismic wavelet scale density]] |
* Is a passive measurement, e.g., does not have active radioactive sources | * Is a passive measurement, e.g., does not have active radioactive sources | ||
| Line 48: | Line 48: | ||
* Direction away from the well to distant source cannot be determined without other information | * Direction away from the well to distant source cannot be determined without other information | ||
| − | * Engineering limitations of the tool restricts use to certain candidate wells (hole size, low deviation, slow reading) | + | * Engineering limitations of the tool restricts use to certain candidate wells ([[hole size]], [[low deviation]], slow reading) |
* Only a few tools presently available for use | * Only a few tools presently available for use | ||
* Expensive to operate | * Expensive to operate | ||
| Line 64: | Line 64: | ||
[[Category:Predicting the occurrence of oil and gas traps]] | [[Category:Predicting the occurrence of oil and gas traps]] | ||
[[Category:Applying gravity in petroleum exploration]] | [[Category:Applying gravity in petroleum exploration]] | ||
| + | [[Category:Treatise Handbook 3]] | ||
Latest revision as of 15:11, 31 January 2022
Borehole gravity uses
Borehole gravity is especially effective for the following exploration and production purposes:
Exploration purposes
- Locating nearby salt structures
- Locating distance to nearby structures (e.g., reefs) for step-outs and sidetracks
- Better synthetic seismograms
Production purposes
- Measuring bulk density when radioactive tools are too risky
- Logging cased holes for lithologic changes
- Calculating overburden for hydrofracture jobs
- Monitoring injection fluids
- Monitoring reservoirs during fluid withdrawal
- Exploring for bypassed, behind-casing gas zones
- Evaluating reservoir porosity, especially in carbonate reservoirs where other tools are not as reliable
Borehole gravity advantages
The following characteristics give borehole gravity surveys advantages in certain situations:
- Directly measures bulk density
- Is a deep imaging tool
- Is effective in both cased and uncased wells
- Is unaffected by washouts, hole rugosity, or mud invasion effects
- Can help determine seismic wavelet scale density
- Is a passive measurement, e.g., does not have active radioactive sources
Borehole gravity disadvantages
The following characteristics give borehole gravity surveys disadvantages in certain situations:
- Direction away from the well to distant source cannot be determined without other information
- Engineering limitations of the tool restricts use to certain candidate wells (hole size, low deviation, slow reading)
- Only a few tools presently available for use
- Expensive to operate
See also
External links
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