Adjacent well detection method based on borehole and elastic wave interaction theory

Abstract

The invention discloses an adjacent well detection method based on a well hole and elastic wave interaction theory. The method comprises the following steps of: firstly, placing an orthogonal dipole sound source pointing to x and y in an instrument coordinate system xy and a receiver in an exploratory well, and exciting the x and y pointing sound sources to radiate elastic waves to the stratum outside the well; respectively acquiring four component signals (xx, xy, yx, yy) by using receivers pointed by x and y; taking an angle [phi] relative to an x axis or a fixed direction of the instrumentas a variable, forming a [phi]-direction transmitting and receiving composite signal XX by using the four-component out-of-well signals, and changing the [phi] value to obtain an angle [phi]0 when theXX reaches the maximum amplitude; if the logging external signal is the elastic longitudinal wave, enabling [phi] 0 to be the target well orientation; if the signal is an elastic transverse wave withthe polarization direction perpendicular to the well, enabling [phi]0+90 degrees to be the target well orientation; and imaging the maximum amplitude signal XX ([phi]0), and determining the distancebetween the target well and an exploratory well. According to the method, the distance and orientation information of the adjacent wells near the drilled well can be obtained, and important data are provided for well cluster collision prevention and safety production in oil field 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...

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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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