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A Drilling Fluid Density Safety Window Estimation Method Based on Uncertainty Analysis

A technology of drilling fluid density and uncertainty, which is applied in earthwork drilling, wellbore/well components, design optimization/simulation, etc. It can solve problems such as unreasonable design of drilling fluid density and difficulty in determining parameters

Active Publication Date: 2021-09-21
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the difficulty in determining some parameters in the currently widely used analytical method, often using empirical values, which often lead to problems such as unreasonable design of drilling fluid density in complex formations, and to provide a drilling fluid density based on uncertainty analysis. Safe Window Estimation Method

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  • A Drilling Fluid Density Safety Window Estimation Method Based on Uncertainty Analysis
  • A Drilling Fluid Density Safety Window Estimation Method Based on Uncertainty Analysis
  • A Drilling Fluid Density Safety Window Estimation Method Based on Uncertainty Analysis

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Embodiment

[0045] like Figure 1-11 As shown, a method for estimating the safety window of drilling fluid density based on uncertainty analysis of the present invention comprises the following steps:

[0046] Step 1. In this embodiment, an actual gas well in the Sichuan Basin is taken as the research object. According to the parameter indicators in the engineering practice report and the rock mechanics experiment report, the wellbore stability influence index system is established to obtain the target stratum's influence on the wellbore stability. See Table 1, the target formation is a potential strike-slip stress field, and the vertical stress σ 3 =153.3MPa, the maximum horizontal principal stress σ 1 =172.76MPa, minimum horizontal principal stress σ 2 = 127.96MPa.

[0047] Table 1. Indexes that affect the stability of the borehole wall

[0048]

[0049] Step 2, establish the numerical model of the index of the target formation by the finite element simulation software ABAQUS, su...

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Abstract

The invention relates to the technical field of petroleum engineering, and discloses that based on specific actual data, a numerical model is established and a response surface analysis is performed, and the response surface optimization function of the drilling fluid density is obtained through simulation and statistics, so as to search for the best drilling fluid Density safety window, forming a drilling fluid density safety window estimation method based on uncertainty analysis, is of great value in guiding the reasonable selection of drilling fluid density in drilling engineering.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a method for estimating the safety window of drilling fluid density based on uncertainty analysis. Background technique [0002] Wellbore stability evaluation is a key task in drilling engineering, which is directly related to the success or failure of drilling operations. The tensional fracture (lost circulation) and shear collapse (well collapse) of the wellbore wall are the wellbore instability problems often encountered in the drilling process, which seriously affect the drilling speed, quality and cost. Some new exploration areas will also fail to reach the target layer due to the instability of the borehole wall, which will delay the speed of exploration and development and affect its comprehensive economic benefits. Wellbore stability is affected by uncontrollable and controllable factors, and drilling fluid density is the most critical controllable factor i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/23E21B49/00
CPCE21B49/003G06F30/13
Inventor 魏晓琛沈家伟刘向君梁利喜
Owner SOUTHWEST PETROLEUM UNIV