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Advanced-prediction observation system while drilling

An advanced forecasting and observation system technology, applied in the field of geophysical exploration, can solve the problems of difficult detection and interpretation of hidden objects in measurement data, easy to be affected by the shallow medium around drilling, and weak measurement signals, so as to facilitate comparative analysis, overcome the influence, The effect of increasing acceptance

Inactive Publication Date: 2011-08-17
CENT SOUTH UNIV
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Problems solved by technology

[0005] Existing resistivity method and IP method logging, using a small polar distance device, the measurement signal is weak, easily affected by the shallow medium around the drilling, and the measurement data is difficult to use for the detection of hidden objects within a large radius around the drilling Explanation: For the detection of concealed targets within a large radius, detection methods and observation systems with high power and high signal-to-noise ratio are required

Method used

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  • Advanced-prediction observation system while drilling

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Embodiment 1

[0037] see figure 1 , the present invention selects an artificial electric field interference less than 500 meters away from the wellhead and arranges a far reference electrode at a place with good grounding; the power supply electrode, the barrier air bag and the measurement electrode group with a fixed relative distance are lowered into the borehole along with the power supply electrode. The power supply electrode at the bottom of the hole and the remote reference electrode are connected to the host of the electrical instrument through a cable, and a power supply circuit is formed through the rock-soil medium; the measurement electrode group is composed of 16 electrodes, and the distance between each electrode is 10 meters. The relative distance between the power supply electrodes forms a set of measuring electrode groups, and the measuring electrode groups are connected in series with the multi-channel electrode conversion device and the signal input channel of the electrica...

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Abstract

The invention discloses an advanced-prediction observation system while drilling, and is characterized in that: a power supply electrode is arranged at the bottom of a bored well; a measurement electrode group is arranged above the power supply electrode in the bored well; a remote reference electrode and the power supply electrode are connected with an electrical instrument respectively via a cable; the measurement electrode group is connected with the electrical instrument via a measurement cable and an electrode conversion switch; and an apparent resistivity calculating unit or an induced polarization amplitude frequency calculating unit is arranged in the electrical instrument. The advanced-prediction observation system while drilling is high in detection accuracy, simple in operationand construction, low in measuring cost, and has good application value.

Description

technical field [0001] The invention belongs to the field of geophysical prospecting, and relates to an advanced forecasting observation system while drilling, in particular to a geophysical prospecting method technology used for metal, oil and gas and other mineral resources exploration and measurement in wells, used for forecasting and forecasting around or at the bottom of boreholes Hidden orebodies that may be missed in drilling and exploration within a certain depth range also have application prospects in water resources drilling and mining. Background technique [0002] Concealed mineral resources are different from surrounding rock mass media in terms of resistivity and induced polarizability properties. Using the characteristics of low resistivity to attract current and high resistivity to repel current can reflect the approaching degree of concealed ore bodies through the abnormal measurement potential when approaching the object gradually; metal ore bodies and wat...

Claims

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Application Information

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IPC IPC(8): G01V3/22G01V3/38
Inventor 朱德兵
Owner CENT SOUTH UNIV
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