Method and device for guiding horizontal well into target

Abstract

The invention discloses a target guiding and entering method and device for a horizontal well. The method comprises the following steps: acquiring well track parameters including the prediction depth of a marker zone of a target well before drilling, and the predication value of the depth of a target-entering point according to a geological model of a reservoir in a depth domain and a horizontal well track; acquiring the real-time LWD (Logging While Drilling) data of the current marker zone, and determining the actual drilling depth of the current marker zone according to the real-time LWD data; calculating the error value between the actual drilling depth of the current marker zone and the prediction depth, in the well track parameters, of the current marker zone; if the error value is more than a preset threshold, adjusting the geological model of the reservoir in the depth domain according to the actual drilling depth of the current marker zone; modifying the well track parameters of the target well marker zone without being reached in drilling, and the prediction value of the target-entering point depth according to the adjusted geological model of the reservoir in the depth domain. According to the method and the device, the actual drilling track of the horizontal well can be guided to enable a target to accurately enter.

Description

technical field [0001] The invention relates to a horizontal well geological tracking and steering technology, in particular to a method and device for guiding a horizontal well into a target. Background technique [0002] Horizontal well geological tracking and steering technology mainly refers to: in the process of horizontal well site construction, according to the pre-drilling reservoir geological research results, combined with various geological information captured during the actual drilling process, correctly judge the lithology and structure of the underground formation Geological characteristics such as the spatial distribution of mining target layers. [0003] Such as figure 1 As shown, the horizontal well geotracking and steering is mainly divided into two stages, namely, the build-up section and the horizontal section. Among them, the core task of geological tracking and guidance in the build-up section is to ensure that the actual drilling trajectory accurate...

AI Technical Summary

Problems solved by technology

When the designed section is inconsistent with the actual drilling section, the trajectory of the horizontal well will deviate from the target layer, affecting the development effect

Especially for thin-bed horizontal wells whose target layer thickness is usually less than 8 meters, if there is a slight deviation, the trajectory of the horizontal well may deviate from the target layer and fail to reach the oil layer

Images