Scaling-down cavernous formation dual laterolog physical simulation device and experimental method

A technology of dual laterolog and physical simulation, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., and can solve problems such as blank space

Inactive Publication Date: 2014-03-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Application Information

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Problems solved by technology

Cave physical model experiments have done a lot of research on mathematical simulation methods at home and abroad, but the field of accurate experimental research on physical simulation of dual laterolog response characteristics in cave formations is still blank

Method used

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  • Scaling-down cavernous formation dual laterolog physical simulation device and experimental method
  • Scaling-down cavernous formation dual laterolog physical simulation device and experimental method
  • Scaling-down cavernous formation dual laterolog physical simulation device and experimental method

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Embodiment Construction

[0023] to combine figure 1 , figure 2 and image 3 A reduced-scale cave dual laterolog physical experiment simulation device includes a bedrock model 1, a cave physical model 2 and a dual laterolog tool 3. The resistivity range of the above-mentioned bedrock model is 2000Ω.m~10000Ω.m, and the bedrock model is provided with a vertical borehole 4 . The above cave physical model is placed horizontally in the bedrock model to form an unfilled cave in the wellbore. The resistivity of the unfilled cave can be 0.1Ω.m, 1Ω.m, 5Ω.m, 50Ω.m, 100Ω.m, 200Ω. m, 300Ω.m, 400Ω.m, 450Ω.m, 500Ω.m, the diameter of the unfilled cavity is 50mm, 100mm, 250mm, 300mm, 350mm, 400mm. The above-mentioned dual laterolog tool includes a main electrode Ao, two supervisory electrodes M, M', four shielding electrodes A1, A1', A2, A2', the supervisory electrodes are arranged symmetrically around the main electrode, and the four shielding electrodes They are symmetrically placed behind the supervisory elect...

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Abstract

The invention discloses a scaling-down cavernous formation dual laterolog physical simulation device and an experimental method. The simulation device is characterized by comprising a bedrock model, a cave physical model and a scaling-down dual laterolog instrument, resistivity of the bedrock model ranges from 2000 omega.m to 10000 omega.m, the bedrock model is provided with a vertical borehole, the cave physical model is transversely disposed in the bedrock model to form a borehole-passing unfilled cave, resistivity of the unfilled cave ranges from 0.1 omega.m to 500 omega.m, diameter of the unfilled cave ranges from 50mm to 400mm, and the dual laterolog instrument comprises a main electrode, a supervisory electrode and a shielding electrode. By the device and the method, filling substances in the cave, filling degree, development scale and scaling-down dual laterolog response at different positions of the borehole can be simulated by changing the resistivity of the models, and related basis can be provided for carbonatite reservoir space evaluation on the basis of dual laterolog.

Description

technical field [0001] The invention belongs to the fields of petrophysics and petroleum geophysics logging, in particular to a device and an experimental method for simulating a scaled down cave formation model by using a scaled down double lateral logging instrument. Background technique [0002] Carbonate reservoirs are generally developed in the south and west of my country, and are important oil and gas exploration areas, with complex reservoir spaces such as fractures, caves, and pores, and are often affected by many factors such as deposition, structure, diagenesis, and epigenetic transformation. The development of secondary fractures and caves composed of multi-stage multi-cycle paleokarst and structural fractures, strong heterogeneity, anisotropic fracture-cavity development scales, uneven distribution, and large changes in filling types and filling degrees make fractures-caves The logging response of reservoirs is very complex, which affects the ambiguity and ambigui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
Inventor 葛新民范宜仁邓少贵谭宝海刘玺
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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