Horizontal well geosteering method based on element logging

Abstract

The invention discloses a horizontal well geosteering method based on element logging. The horizontal well geosteering method comprises the following specific steps: 1, acquiring geological element data of a target horizontal well; 2, establishing ratio data of longitudinal characteristic elements and related elements of the target horizontal well; 3, obtaining geological element difference data of a target layer and a non-target layer of the target horizontal well; 4, establishing a geological element initial model of the target horizontal well along the design trajectory of the target horizontal well, and predicting geological element change data along the design trajectory of the target horizontal well; 5, carrying out actual drilling on the target horizontal well, obtaining geologicalelement data actually measured while drilling, and carrying out comparative analysis on the geological element data actually measured while drilling and the predicted geological element data, so the geological element data actually measured while drilling and the predicted geological element data tend to be consistent. The position of the drill bit at the bottom of the well can be accurately judged, and the concealed fault is successfully identified, so the drilling trajectory is reliably guided to be timely and reliably adjusted, and the drilling quality is guaranteed.

Description

technical field [0001] The invention relates to oil and gas well exploration and development technology, in particular to a geosteering method for horizontal well drilling. Background technique [0002] In the field of oil and natural gas exploration and development technology, horizontal well drilling is an important technical means to increase the exposure rate of oil and gas layers and increase the production of a single well. [0003] With the rapid development of logging while drilling technology, it has been widely used in the drilling process of horizontal wells. For example, the gamma-ray logging-while-drilling technology developed in the development of shale gas horizontal wells uses the natural gamma data while drilling to compare with offset wells or pilot wells to carry out stratigraphic comparison analysis, thereby judging the position of the drill bit at the bottom of the well. , to guide the drilling trajectory. [0004] In the geological environment with co...

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Problems solved by technology

[0004] In the geological environment with complex structures and large changes in formation dip, especially in the case of hidden faults, it is difficult to judge the position of the bottom hole drill bit only by using LWD technology, which will reduce the drilling rate of high-quality reservoirs. Even delays in the construction period and well filling events will cause huge losses

Carbonate oil and gas reservoirs belong to the geological environment with complex structures and large dip angle changes. In carbonate oil and gas reservoirs, because the natural gamma ray value is low and basically unchanged, the gamma ray can be used as a reference. It is necessary to solve the technical problem that it is difficult to judge the position of the bottom hole drill bit during drilling and cannot guide the reliable drilling of horizontal wells.

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