High Resolution Induction Tool (HRI™)
| The HRI
tool is an electrical wireline tool that belongs to the
electromagnetic family of tools. It records apparent
conductivity of the subsurface formations. Data
processing based on conventional electromagnetic
algorithms converts the measured conductivity into
resistivity. The HRI tool works well in boreholes
drilled with water, air or oil. Standard HRI tool
presentation includes deep and medium resistivities
derived from the raw conductivities, as well as the
computed radial resistivities at the following five
depths of investigation: 24-in., 30-in., 40-in., 60-in.
and 90-in. The HRI tool is always run in the hole with a
digitally focused device that yields a shallow
resistivity. Also, SP is an integral part of the HRI
tool. |
| » HRI Tool Applications |
| The HRI
tool can be used in the following applications: |
- Determine resistivity of uninvaded zone
(Rt)
- Helps distinguish between salt-water bearing and hydrocarbon-bearing formations
- Estimate extent of invasion and qualitatively
assess the permeability of rocks
- Provides indication of hydrocarbons
- Correlate formations. Estimate Rw (SP
application)
|
| » HRI Tool Features |
| The HRI
tool consists of an array of 4 transmitters and one
receiver that has a three-coil structure. The HRI tool
operates at the frequency of 20 kHz. The tool measures
both R and X components of the conductivities in the
invaded zone and in the uninvaded zone. X signals are
used for skin correction. The raw conductivities are
corrected for skin-, shoulder bed- and borehole effects
to produce the deep (HDRS) and medium (HMRS)
resistivities. HRI tool processing software then
produces the five radial resistivities at different
depths of investigation as mentioned before. The
Digitally Focused Log (DFL) associated with the the HRI
tool provides a shallow focused resistivity measurement
with a radial investigation of 15-in. The vertical
resolution of the DFL closely matches that of the HRI
tool induction curves, so DFL and HRI tool logs overlay
when there is no invasion. |
| » HRI™ Tool Benefits |
| The HRI
tool offers the following benefits: |
- More reliable water saturation estimates than a
conventional dual induction tool. This helps enhance
the accuracy of water saturation estimates which is
critical to compute oil and gas reserves.
- Identifies beds as thin as 1-ft which improves the estimation of fluid saturations and the hydrocarbon reserves in thinly laminated pays
|
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|
 |
| Standard
HRI log example showing deep and medium resistivities
(Track 2) computed by correcting the raw conductivity
data for skin-, shoulder bed- and borehole effects.
Track 3 presents computed radial resistivities at
24-in., 30-in., 40-in., 60-in. and 90-in. depth of
investigation. |
|
| » Associated Answer Products |
| The
following answer products are associated with the HRI
tool: |
- Five radial resistivities at 24-in., 30-in.,
40-in., 60-in. and 90-in.
|
|
- The two apparent resistivities (HDRS & HMRS)
measured by HRI can be input to any of the Halliburton
formation evaluation
software
|
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|
| Length |
Diameter |
Maximum
Pressure |
Maximum
Temperature |
Weight |
| (ft) |
(m) |
(in) |
(mm) |
(psi) |
(Mpa) |
(°F) |
(°C) |
(lb) |
(kg) |
| 33.3 |
10.2 |
3.63 |
92.2 |
20,000 |
137.9 |
350 |
176.7 |
455 |
206.4 |
|
|
