Geosteering early warning method

Abstract

The geosteering early warning method comprises: acquring a stratum position depth model of a work area where a target well is located; determining an effective well logging curve according to the welldrilling early warning type, obtaining corresponding effective well logging curve data, and determining characteristic data of each stratum position in the stratum position depth model according to the effective well logging curve data; obtaining drill bit oblique depth point data of the borehole trajectory and effective logging curve data of the target well, and determining early warning analysis data; determining the current vertical depth data of the drill bit according to the drill bit oblique depth point data, determining the stratum level of the drill bit in the stratum level depth model according to the current vertical depth data, and determining whether geosteering early warning is needed according to the early warning analysis data and the characteristic data of the stratum level of the drill bit in the stratum level depth model. In the implementation process of the method, manual participation is not needed any more, and therefore lagging and low accuracy brought to the judgment result due to the fact that manual experience is adopted for stratum judgment and comparison are avoided.

Description

technical field [0001] The invention relates to the technical field of oil and gas development and exploration, in particular to a geosteering early warning method. Background technique [0002] With the development of oil drilling technology, complex oil and gas reservoirs that could not be exploited commercially in the past can also be exploited by horizontal wells. This drilling technology can greatly increase the effective length of the well trajectory in contact with the reservoir, expand the oil drainage area, and improve the recovery rate of oil and gas reservoirs. Especially for the development of shale oil and gas reservoirs, horizontal well drilling technology plays a vital role effect. However, horizontal well drilling also puts forward higher requirements for well trajectory control, drilling risk prediction and avoidance, and geosteering methods have been widely used. [0003] The current mainstream geosteering technology often uses logging-while-drilling (LWD...

AI Technical Summary

Problems solved by technology

This method has hysteresis and low accuracy, and it cannot know the position of the drill bit and the situation of the corresponding formation interface

This method not only often leads to the problem of low drilling rate, but also greatly increases the risk of drilling

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