Method and device for predicting rock drillability of wildcat well before drilling
A prediction method and prediction device technology, applied in the field of oil drilling
Inactive Publication Date: 2013-06-26
CHINA UNIV OF PETROLEUM (BEIJING)
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[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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[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0033] Such as figure 1 Shown is a flow chart of a method for pre-drilling prediction of rock drillability in the wildcat well according to an embodiment of the present invention. The method for pre-drilling prediction of rock drillability in the wildcat well includes the following steps:
[0034] Step 1. Pick up the layer velocities of different formations of the Yemaojing rock from the seismic velocity spectrum of the rock to be drilled....
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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 the rock drillability of the Wildcat well. Background technique [0002] Rock drillability is an important formation drilling characteristic parameter in petroleum drilling. It is a comprehensive index for evaluating the difficulty of rock fragmentation and a basic factor determining drilling efficiency. Rock drillability parameters are an important basis for reasonable selection of drilling methods, bit types and design drilling parameters. Correctly assessing the drillability of the formation is one of the important foundations for achieving high-quality and efficient drilling. It is of great significance for increasing the drilling speed and reducing the drilling cost. [0003] In the process of implementing the present invention, the inventor found that the prior art has at least the following problems: the prior art does n...
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IPC IPC(8): E21B49/00G06N3/02
Inventor 张辉高德利
Owner CHINA UNIV OF PETROLEUM (BEIJING)