A Quantitative Evaluation Method for Borehole Instability Risk in Complex Formation Drilling

A technology for wellbore instability and complex formation, applied in the fields of rock mechanics and engineering, petroleum engineering rock mechanics, to achieve the effect of accurate samples and improved accuracy

Active Publication Date: 2022-04-12
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Using correlation analysis to characterize the relationship between parameters and assess the risk of wellbore instability has not been reported yet

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  • A Quantitative Evaluation Method for Borehole Instability Risk in Complex Formation Drilling
  • A Quantitative Evaluation Method for Borehole Instability Risk in Complex Formation Drilling
  • A Quantitative Evaluation Method for Borehole Instability Risk in Complex Formation Drilling

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Embodiment Construction

[0039] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. 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.

[0040] Such as figure 1 As shown, a method for quantitatively evaluating the risk of wellbore instability in complex formation drilling of the present invention comprises the following steps:

[0041] Step S10, obtaining geomechanical parameters (maximum horizontal principal stress, minimum horizontal principal stress, pore pressure) and rock mechanical parameters (cohesion, internal friction angle, tensile strength) according to logging data or laboratory test data;

[0042] If it is indoor experimental data...

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Abstract

The invention discloses a method for quantitatively evaluating the risk of wellbore instability in complex formation drilling, including: determining geomechanical parameters and rock mechanical parameters; obtaining distribution fitting results of the geomechanical parameters and rock mechanical parameters; Calculate the distribution fitting results of parameters and rock mechanics parameters, obtain K-S test values ​​and sort them; conduct correlation analysis on geomechanics parameters and rock mechanics parameters to obtain a correlation coefficient matrix; establish a reliability evaluation model for wellbore instability risk; According to the K-S test value and the correlation coefficient matrix, Monte Carlo simulation is carried out and brought into the wellbore instability risk reliability evaluation model to calculate the wellbore instability risk. The invention fully characterizes the uncertainty of parameters by using well logging data or indoor experiment results, especially considering the correlation between various parameters, so that the samples obtained by Monte Carlo sampling are more accurate, and the risk assessment of well wall instability is improved. accuracy.

Description

technical field [0001] The invention relates to a method for quantitatively evaluating the instability risk of wellbore walls in complex formations, and belongs to the related fields of petroleum engineering rock mechanics, rock mechanics and engineering, and the like. Background technique [0002] With the rapid development of my country's national economy, the demand for natural gas has increased sharply, the contradiction between supply and demand has become increasingly prominent, and energy security is facing new challenges. The development of oil and natural gas has expanded to deep wells and ultra-deep wells. The increasing concealment and complexity of the environment and the greater uncertainty of the mechanical properties pose a higher challenge to the stability of the borehole wall, which is also a technical problem that has plagued drilling engineering for a long time. In the study of borehole wall stability, the borehole wall failure is mainly the shear collapse ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q10/06G06Q50/06G06F111/08G06F119/02G06F119/14
CPCG06F30/20G06Q10/0635G06Q50/06G06F2111/08G06F2119/02G06F2119/14
Inventor 马天寿张赟刘阳付建红王贵田家林
Owner SOUTHWEST PETROLEUM UNIV
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