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Horizontal well inclination section geosteering method

A technology for geosteering and horizontal wells, applied in directional drilling, earthwork drilling, wellbore/well components, etc., can solve problems such as increased dogleg, uneven wellbore trajectory, and impracticable engineering, and achieve the elimination of fixed Error, reduction and adjustment of wellbore trajectory, and the effect of prediction of optimal target altitude depth H

Inactive Publication Date: 2018-10-09
尤少华
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Problems solved by technology

However, according to stratigraphy, the formation thickness between the reference well and the target well is correlated and not always completely equal, which leads to large errors when the marker layer is far from the target point, which in turn leads to unnecessary adjustments The wellbore trajectory increases the dogleg degree unnecessarily, the wellbore trajectory is not smooth, and even makes the project impossible to implement

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Embodiment Construction

[0056] It should be noted that, in the case of no conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0057] Combine below Figures 1 to 5 , the preferred embodiments of the present invention will be described in further detail.

[0058] Such as figure 1 As shown, the four steps and their relationships of the geosteering method for the kickoff section of the horizontal well are shown, wherein the adjacent well comparison method in step A2 further includes four steps.

[0059] Such as figure 2 As shown, the structural map of the target layer is shown, the structural line spacing is 2 meters vertically, and the altitude depth is marked on the structural line; the structural map is the top structural map of the target layer, and the design trajectory, Wellheads and target points are m...

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Abstract

The invention relates to the technical field of drilling exploration and development, in particular to a horizontal well inclination section geosteering method. The horizontal well inclination sectiongeosteering method can preferably predicate a target spot height above sea level depth on an inclination section to enable a real drilling track to land smoothly. According to the technical scheme, the horizontal well inclination section geosteering method comprises four steps that 1) basic data and following drill data are collected; 2) the target spot height above sea level depth is predicatedby integrated utilizing an adjoining well correlation method and a synthesis method, and different weights are obtained as evidence in different locations of the inclination section; 3) the real drilling track is guided to drill; and 4) a step A2 and a step A3 are repeated until the inclination section is completed. The horizontal well inclination section geosteering method has the beneficial effects that unnecessary adjusting well track can be reduced, a fixed error that is brought by the synthesis method can be eliminated, more preferably predicting of target spot height above sea level depth H is realized, and landing smoothly of a final well track is benefited.

Description

technical field [0001] The invention relates to the technical field of drilling exploration and development of oil and natural gas, and relates to a geosteering method for a deflection section of a horizontal well. Background technique [0002] Horizontal wells are high-investment projects. Usually, sufficient geological and engineering research will be done before the actual drilling, and there will be a detailed design plan, which has a clear understanding of the drilling purpose, regional geology, seismic, comparison wells, and target wells. The description has clear requirements on the spatial relationship between the horizontal well trajectory and the stratum it traverses. However, the underground geological conditions are complex, and this design scheme is only an idealized scheme, which is more or less far from the actual geological conditions. [0003] The value of horizontal well geosteering lies in: on the basis of fully understanding the design scheme, combined w...

Claims

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Application Information

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IPC IPC(8): E21B7/06E21B49/00E21B47/00
CPCE21B7/06E21B47/00E21B49/003
Inventor 邱世军
Owner 尤少华
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