Method and device for predicting rock drillability of wildcat well before drilling

A prediction method and technology of a prediction device, applied in the field of oil drilling

Inactive Publication Date: 2012-07-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Claims
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Problems solved by technology

[0003] In the process of realizing the present invention, the inventor found that there are at least the following problems in the prior art: the prior art does not have a technical solution for evaluating the drillability of formations more correctly

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  • Method and device for predicting rock drillability of wildcat well before drilling
  • Method and device for predicting rock drillability of wildcat well before drilling
  • Method and device for predicting rock drillability of wildcat well before drilling

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Embodiment Construction

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] Such as figure 1 As shown, it is a flow chart of a wildcat well rock drillability pre-drilling prediction method according to an embodiment of the present invention. The wildcat well rock drillability pre-drillability prediction method includes the following steps:

[0034] Step 1, pick up the layer velocity of the different formations of this Wildcat Well rock by the seismic velocity spectrum of the Wildcat Well rock to be drilled; Seismic Velocity Spect...

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Abstract

The invention provides a method and a device for predicting rock drillability of a wildcat well before drilling. The method includes: picking up layer velocities of different layers of wildcat well rocks by the aid of a seismic velocity spectrum for the wildcat well rocks to be drilled; performing correlation analysis by the aid of the layer velocities of the different layers of the wildcat well and other drilled rocks, and selecting a certain drilled well with a rock structure similar to the wildcat well; training a feedforward BP (back-propagation) neural network according to seismic data and core test data of rocks of the selected drilled well to establish a model for predicting the rock drillability of the wildcat well before drilling; and predicting the rock drillability of the wildcat well by the aid of the trained feedforward BP neural network and the layer velocities of the different layers of the wildcat well rocks. By the aid of the method and the device, the relationship between each layer velocity and the rock drillability can be found, important data can be provided for reasonably selecting drilling modes, drill bit types and designed drilling parameters, drilling speed can be increased, and drilling cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a pre-drilling prediction method and device for wildcat well rock drillability. Background technique [0002] Rock drillability is an important parameter of formation drilling characteristics in oil drilling, a comprehensive index to evaluate the difficulty of rock breakage, and a basic factor to determine drilling efficiency. Rock drillability parameters are an important basis for rational selection of drilling methods, bit types and design drilling parameters. Correctly evaluating formation drillability is one of the important foundations for high-quality and efficient drilling, and it is of great significance for improving drilling speed and reducing drilling costs. [0003] In the process of realizing the present invention, the inventors have found at least the following problems in the prior art: the prior art does not have a technical solution for evaluating the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00G06N3/02
Inventor 张辉高德利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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