Drilling speed increase evaluation method based on drill stem-drill bit-rock-shaft system full-scale drilling simulation

An evaluation method, full-scale technology, used in wellbore/well components, earthmoving, surveying, etc.

Inactive Publication Date: 2014-08-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention can also provide basis for field engineers to solve problems such as drilling design, drilling tool combination optimization, drilling parameter optimization and drill bit selection.

Method used

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  • Drilling speed increase evaluation method based on drill stem-drill bit-rock-shaft system full-scale drilling simulation
  • Drilling speed increase evaluation method based on drill stem-drill bit-rock-shaft system full-scale drilling simulation
  • Drilling speed increase evaluation method based on drill stem-drill bit-rock-shaft system full-scale drilling simulation

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Embodiment Construction

[0026] The present invention will be further explained and illustrated below in conjunction with the drawings.

[0027] The invention is based on the finite element model of the full-scale drilling simulation of the drill string-bit-rock-wellbore system, and simulates the real-time drilling process of rock breaking in the drilling engineering through computer simulation. It is mainly composed of three parts. First, a finite element model based on drill string-bit-rock-wellbore system full-scale drilling simulation is established, and then the established finite element model is analyzed and calculated by the display integration algorithm, and finally based on the established evaluation criteria Evaluate the drilling speed increase. It is characterized in that the establishment of the finite element model based on the full-scale drilling simulation of the drill string-bit-rock-wellbore system includes the following steps:

[0028] Step 1. Establish a grid model including the boreho...

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Abstract

The invention relates to a drilling speed increase evaluation method based on drill stem-drill bit-rock-shaft system full-scale drilling simulation. According to the technical scheme, the method comprises the following steps: firstly, establishing a finite element model based on drill stem-drill bit-rock-shaft system full-scale drilling simulation, then, analyzing and solving the established model according to the explicit integration algorithm, and finally, evaluating the drilling speed increase according to established evaluation criteria. The process of establishing the finite element model comprises the following steps: establishing a grid model of all components, defining the physical properties of the components and the constitutive relation and breaking failure criteria of rock, establishing a drill tool and well wall random contact and impact model and a drill bit and rock interaction model, and defining boundary conditions. According to the method, the real-time drilling and rock breaking process is simulated with drill bit rock breaking as the boundary conditions of the lower end of the drill stem, and therefore simulation results are closer to the reality, and references are provided for on-site drilling design, drilling parameter optimization, drill bit model selection and drilling speed increase evaluation.

Description

Technical field [0001] The invention relates to a drilling speed-up evaluation method, in particular to a drilling speed-up evaluation method based on full-scale drilling simulation of a drill string-drill bit-rock-wellbore system. A computer is used to perform real-time simulation and analysis on the process of drilling rock breaking through analysis machinery. Parameters such as drilling speed, wellbore quality and lower drilling tool stability are used to evaluate the drilling speed increase. The invention can provide references for drilling design, drilling tool assembly optimization, drilling parameter optimization, drill bit selection, drilling speed improvement evaluation, etc. in field drilling construction. The invention can be widely used in the field of exploration and development of petroleum, natural gas and coal. Background technique [0002] In the process of oil, gas and coal exploration and development, drilling costs account for 50% to 80% of the total explorat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00
Inventor 祝效华向国春
Owner SOUTHWEST PETROLEUM UNIV
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