A detection method for adjacent wells based on the theory of interaction between borehole and elastic wave

Abstract

The invention discloses an adjacent well detection method based on the theory of interaction between wellbore and elastic wave. It includes the following steps: firstly, the orthogonal dipole sound source and receiver pointing to x and y in the instrument coordinate system x-y are placed in the exploratory well, and the excitation x and y points to the sound source to radiate elastic waves to the formation outside the well; and y-directed receivers respectively collect four-component signals (xx, xy, yx, yy); taking the angle φ relative to the instrument’s x-axis or a fixed direction as a variable, the four-component out-of-well signals are used to form a synthesis of φ-directed transmission and reception Signal XX, change the value of φ to get the angle φ when XX reaches the maximum amplitude 0 ; If the measured external signal is elastic longitudinal wave, φ 0 is the azimuth of the target well; if the signal is an elastic shear wave whose polarization direction is perpendicular to the well, then φ 0 +90° is the azimuth of the target well; for the maximum amplitude signal XX(φ 0 ) imaging to determine the distance between the target well and the exploratory well. The invention can obtain the distance and orientation information of adjacent wells near the drilling well, and provide important data for well cluster anti-collision and safe production in oilfield exploitation.

Description

technical field [0001] The invention belongs to the field of applied geophysical acoustic logging technology. Specifically, the invention places a directional sound source in the detection well to radiate the elastic wave field to the target well beside the well, analyzes the scattering of the wave field by the target well, and measures the target well in the detection well. A method of scattering wave signals and processing the signals to achieve detection and imaging of target wells. Background technique [0002] With the deepening of oil and gas exploration and development, the efficient development of low-permeability, unconventional and offshore complex oil and gas fields is facing technical bottlenecks. Well technologies with complex structures such as dual horizontal wells, multi-lateral wells, rescue wells, and cluster wells have been widely used, greatly reducing The comprehensive cost of drilling has been reduced, and the crude oil production has been increased. T...

AI Technical Summary

Problems solved by technology

Focusing on the on-site needs of drilling anti-collision and wellbore trajectory description, to make up for the lack of electromagnetic detection failure when the target well is an open hole, the adjacent well detection method based on the interaction theory between the wellbore and elastic waves needs to be realized urgently

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