Dual lateral log equipment probe and dual lateral log equipment with probe

Abstract

The invention relates to a dual lateral log equipment probe and dual lateral log equipment with the probe. The dual lateral log equipment probe is provided with an insulated core rod and an electrodesystem installed on the insulated core rod; the electrode system is connected to an electronic circuit through wires, electrodes constituting the electrode system are installed in series on the insulated core rod and separated from one another through insulated materials, and the electrode system consists of the first sampling electrode, one pair of second sampling electrodes, one pair of main electrodes, one pair of first shielding electrodes, one pair of second shielding electrodes, one pair of voltage measurement electrodes, one pair of first annular electrodes and one pair of second annular electrodes. The first sampling electrode is positioned in the middle of the insulated core rod. The second sampling electrodes are positioned on both sides of the first sampling electrode respectively. The main electrodes are positioned on both sides of the second sampling electrodes respectively and connected to the second sampling electrodes through wires. The first shielding electrodes are positioned on the outer sides of the main electrodes respectively and connected to the main electrodes through wires. The second shielding electrodes are positioned on the outer sides of the first shielding electrodes respectively and connected to the first shielding electrodes through wires. The voltage measurement electrodes are positioned between the first shielding electrodes and the second shielding electrodes separately. The first annular electrodes and the second annular electrodes are positioned between the main electrodes and the first shielding electrodes separately in sequence.

Description

technical field [0001] The invention relates to an oilfield measurement tool, in particular to a dual lateral logging tool probe for oil exploration and development and a dual lateral logging tool with the probe. Background technique [0002] The dual lateral logging tool is the main tool for measuring formation resistivity in open-hole wells, studying formation invasion changes, and estimating oil saturation. The traditional dual lateral logging tools mainly include electrode system, electronic circuit, insulation sub joint, the total length is about 7~10 meters, the deep lateral detection depth is about 1~1.5 meters, the shallow lateral detection depth is about 0.2~0.5 meters, and the longitudinal detection depth is about 0.2~0.5 meters. The resolution is about 0.6 meters. When the traditional dual lateral logging tool performs deep lateral logging, the annular electrode emits current into the formation, and the columnar electrode emits shielding current to focus on the m...

AI Technical Summary

Problems solved by technology

This error is small in conventional dual laterologs but can be large in high resolution dual laterologs

[0003] With the deepening of oil and gas exploration and development, reservoirs such as thin interbeds have gradually become the focus of exploration, which requires high-resolution logging tools. The traditional dual-lateral resolution is generally 0.6m, which cannot meet the needs of exploration. At the same time, the rathole length of foreign well logging operations is short, and the operation volume of complex borehole conditions such as highly deviated wells, horizontal wells, and fishbone lateral wells is increasing year by year. The length of traditional dual laterolog tools is about 7~10m , which is not conducive to well site construction and combined logging, and the probability of getting stuck is greatly increased in complex borehole conditions such as highly deviated wells, horizontal wells, and fishbone branch wells

[0004] In addition, traditional dual laterolog tools focus on measuring the resistivity of intrusive layers and undisturbed formations, while the borehole mud resistivity needs to be measured by other instruments

This increases the cost of instrument operation, and at the same time, increases the workload of well site construction

Images