Method and system for evaluating rock drillability anisotropy
A technology of anisotropy and evaluation method, which is applied in the fields of underground resource drilling and mining engineering, geological exploration and development, and can solve the problems of anisotropic evaluation of rock drillability.
Inactive Publication Date: 2015-07-22
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
The existing evaluation methods for rock drillability anisotropy at home and abroad are limited to balanced drilling and near-balanced drilling (the bottom hole pressure difference is about The bottom pressure difference is less than 0) to evaluate the anisotropy of rock drillability
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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0018] figure 1 It is an overall flowchart of a method for evaluating the anisotropy of rock drillability under different bottom hole pressure differences according to an embodiment of the present invention. Such as figure 1 As shown, the method includes the following steps:
[0019] 110. Measure the acoustic parameters of vertical bedding and horizontal bedding of rock samples under different bottom hole pressure differences;
[0020] 120. Respectively measure the drillability data of vertical bedding and horizontal bedding of the rock sample under different bottom hole pressure differences...
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The invention provides a method and system for evaluating rock drillability anisotropy. The method includes: respectively determining acoustic parameters of vertical stratification and horizontal stratification of a rock sample under different shaft bottom differential pressure; respectively determining drillability data of the vertical stratification and the horizontal stratification of the rock sample under the different shaft bottom differential pressure; building a drillability anisotropy model of the rock sample under the different shaft bottom differential pressure according to the acoustic parameters and the drillability data; and obtaining drillability anisotropy index of the rock sample under the different shaft bottom differential pressure according to the drillability anisotropy model. The method and system for evaluating the rock drillability anisotropy can calculate the drillability anisotropy index of rocks under the different shaft bottom differential pressure and provides key parameters for borehole trajectory deflection mechanism revelation and prediction and control calculation of real drilling trajectory.
Description
technical field [0001] The present invention relates to the technical field of geological exploration and development, in particular to the technical field of underground resource drilling engineering, and specifically relates to a method and system for evaluating the anisotropy of rock drillability. Background technique [0002] At present, the drillability of rocks can be used as an important basis for selecting drill bits and guiding geological stratification during the exploration and development of oil and gas fields. Since the middle of the last century, scholars at home and abroad have devoted themselves to the study of rock drillability, and the determination of the drillability level of formation rocks through indoor core experiments has been widely adopted by the petroleum industry. Accurately predicting rock drillability is of great significance to improving deep well ROP, shortening drilling cycle and improving deep well drilling level. [0003] The anisotropy o...
Claims
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IPC IPC(8): E21B47/14
Inventor 张辉高德利黄鹤
Owner CHINA UNIV OF PETROLEUM (BEIJING)