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HALT high resolution array laterolog technology is the main method for the formation resistivity imaging measurement of the open hole logging. It consists of one main electrode, twelve focus electrode which are symmetry placed, twelve supply electrode totally twenty-five electrodes. The circuit is placed inside the sonde.

HLAT can acquire six resistivity curve at the same time for one logging, it complete the measurement from mud resistivity to formation apparent resistivity of different detective depth, researching the variation of the formation resistivity and perform the fine division of the formation information. It can accurately reflect two-dimensional formation model which represent the formation feature through mathematical inversion, and accurate formation real resistivity Rt could be obtained, getting the accurate calculation for oil saturation. The vertical resolution can be improved from 24in to 12in, and the strong layered ability meet the evaluation requirement for the oil thin layers.

Good logging curve was got from the contrast test in Shengli oilfield, it is greatly advanced for the tool feature compared with the common laterolog tool. 

Logging environment:

Max. temp.:  175℃

Max. pressure: 140MPa

Shock and vibration:

Accelerated speed:980 m/s2

Shock frequency: once time for axial direction or horizontal direction

Pulse duration: 11 ms±1 ms

Waveform: half sinusoid

Min. borehole:≥5in

Max. borehole:≤16in

Measurement range (8 in borehole):

When mud resistivity Rm=1，0.2～100000Ω·m

When mud resistivity Rm=0.2，0.2～200000Ω·m

Mud resistivity measurement range: 0.01～5Ω·m

Measurement accuracy ( for the unlimited, non invaded zone layer):

0.2～1Ω·m        ±20%

1～2000Ω·m       ±5%

2000～5000Ω·m    ±10%

5000～100000Ω·m  ±20%（Rm=1）

5000～20000Ω·m   ±20%（Rm=0.2）

Detective depth:50in（Rt/Rxo为10/1）

Vertical resolution: 12in

Dimensions: O.D. 35/8in, total length 24.1ft

High resolution guarantee 12in thin layer could be clearly displayed.

The nature of the radial invasion could be accurately decided by the five different detective depth curves.

Improved the logging efficiency due to reduce the hard electrode.

Groningen electrode potential hasn’t any influence due to all the loop come back to the tool shell.

Quick power control technology meet the formation response.

Various modes can work at the same time because of the fractional frequency control technology.

Flexible combination modes could be realized due to the circuit placed inside the sonde.