Well circumference interface detection method based on electromagnetic scattering

A technology of electromagnetic scattering and detection methods, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of insufficient utilization of electromagnetic scattering signals, etc., and achieve good description of stratum details, obvious effects, and simple identification methods Effect

Active Publication Date: 2017-09-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0005] The present invention provides a method for detecting the interface around the well based on electromagnetic scattering, aiming at the deficienci

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  • Well circumference interface detection method based on electromagnetic scattering
  • Well circumference interface detection method based on electromagnetic scattering
  • Well circumference interface detection method based on electromagnetic scattering

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Embodiment Construction

[0034] The purpose of the invention is to construct a method for extracting the electromagnetic scattering signal of the interface around the well and increasing the detection range. The invention adopts a symmetrical antenna structure design, extracts scattered signals of anomalous bodies around wells, and obtains stratum interface information by using the amplitude difference of receiving antenna signals according to the signal response characteristics under different transmitting frequencies, source distances and inclination angles. The invention is used for the detection of the interface around the well. According to the symmetrical receiving antenna structure provided by the invention, the scattered field is measured, and the boundary detection is completed through the analysis of the scattered field. The detection method of the invention can acquire interface scattering signals, and the scattering signals can better describe the interface around the well. Therefore, the m...

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Abstract

The invention provides a well circumference interface detection method based on electromagnetic scattering. The method comprises the following steps that symmetrical antenna structures are utilized to extract scattering field signals, and characterization is conducted on the well circumference interface by gaining difference signals; the relations between the boundary exploration capacity and the transmitting frequency, the boundary exploration capacity and the source distance as well as the boundary exploration capacity and the tilt angle are determined, and suitable parameters are chosen to achieve the optimum detection effect; and a single-shot four-receiving antenna structure is adopted for detection, and the cross-plot identification interface relative position is established. According to the well circumference interface detection method, the influence of an electromagnetic scattering field on the well circumference interface detection effect is sufficiently considered, the amplitude difference of symmetrical receiving antennas is utilized to show electromagnetic scattering signals, rapid identification of the well circumference interface is achieved, and combination of the two sets of antenna structures is utilized to complete determination of the well circumference interface relative position; and the identification method is simple, and the effect is obvious.

Description

technical field [0001] The invention relates to the technical field of electromagnetic wave logging, in particular to a method for detecting the interface around a well based on electromagnetic scattering. Background technique [0002] Geosteering drilling is an important means of efficient oil and gas development, and early detection and prediction of the well boundary is the key to steering drilling. The transmitting and receiving antennas of traditional electromagnetic wave logging tools are coaxially arranged, and the detection range is only 2-3m, and they do not have azimuth detection capability. The azimuth electromagnetic wave instrument, on the basis of multi-frequency and multi-source distance, adopts coaxial / tilted / coplanar antennas to realize the measurement of various components of the electromagnetic field, and the boundary detection range can reach 5-6m. At present, the electromagnetic wave logging generally distinguishes the formation according to the geometr...

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Application Information

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IPC IPC(8): E21B47/13G06F17/50
CPCE21B47/13G06F30/20
Inventor 邓少贵张盼王正楷袁习勇牛云峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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