Method and apparatus for predicting the depth of entry and termination points of a horizontal well

Abstract

The invention discloses a method and a device for predicting the depth of an inlet target point and an end point of a horizontal well, and belongs to the technical field of oil and gas exploitation. The method comprises the steps that a drilled inlet target point and vertical projection point of the horizontal well are marked in a time domain seismic profile map, and an inlet target point and an end point of the horizontal well are marked; a drilled inlet target point and vertical projection point of the horizontal well are marked in a depth domain reservoir profile map; the time domain seismic profile map is subjected to telescopic processing, and the drilled inlet target points and the vertical projection points in the time domain seismic profile map and the depth domain seismic profilemap are overlapped respectively, and the depth value of the depth domain reservoir profile map corresponding to the inlet target points and the end points of the horizontal well is determined. According to the method, the time domain seismic profile map and the depth domain reservoir profile map are compared and analyzed, and the depth value in the depth domain seismic profile map is relatively accurate, so that the depth error of the predicted inlet target point and end point of the horizontal well is reduced, and the accuracy of predicting the depth of the inlet target point and the end point of the horizontal well is improved.

Description

technical field [0001] The present application relates to the technical field of oil and gas production, and in particular to a method and device for predicting the depth of an entry target point and an end point of a horizontal well. Background technique [0002] In the development of oil and gas fields, before the horizontal well is drilled, it is necessary to design the well trajectory of the horizontal well, and to design the well trajectory of the horizontal well, it is necessary to predict the starting point (also called the entry target point) and the end point (also called can be referred to as the depth of the end point). Wherein, the horizontal well includes a vertical section and a horizontal section, the horizontal section refers to a part of the oil well located in the reservoir, and the wellbore trajectory refers to the trajectory of the horizontal well in the reservoir, that is, the trajectory of the horizontal section. [0003] The method for predicting the ...

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Problems solved by technology

[0005] For areas with large stratum structure fluctuations, the time-depth relationship in seismic interpretation data is not accurate enough, which makes the depth error of the entrance target point and end point of the horizontal well predicted by the method in the related technology relatively large, and then makes the follow-up design Well trajectory is inaccurate

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