Supercharging effect force-considering hole-wall collapsing pressure calculation method

A technology for wellbore collapse and stress effect, applied in the field of oil drilling, which can solve the problems of rising pore pressure near wellbore, difficulty in accurately predicting collapse pressure, and failure to consider effects, etc.

Inactive Publication Date: 2017-08-11
PETROCHINA CO LTD
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Problems solved by technology

[0005] The existing wellbore collapse pressure calculation formula does not take into account the effect of drilling fluid on the rock wall during the drilling process, that is, during the drilling process, the drilling fluid filtrate invades the formation and forms mud cake on the wellbore wall, which wil

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  • Supercharging effect force-considering hole-wall collapsing pressure calculation method
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  • Supercharging effect force-considering hole-wall collapsing pressure calculation method

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Embodiment Construction

[0031] In order to make the technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] This embodiment provides a calculation method of wellbore collapse pressure considering pressurization effect stress, such as figure 1 As shown, the method includes:

[0033] Step 101: Obtain formation parameters and drilling fluid density from the geological data, logging data and drilling data of the selected area;

[0034] Specifically, formation parameters and drilling fluid density can be obtained from the geological data, logging data and drilling data of the selected area, which can be obtained by querying the formation data in the area or using measurement-while-drilling tools to directly detect during the drilling process, where , formation parameters include but not limited to: well depth, pore pressure, effective stress coefficient, ...

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Abstract

The invention discloses a supercharging effect force-considering hole-wall collapsing pressure calculation method, and belongs to the field of oil drilling. The method comprises the following steps of: obtaining a stratum parameter and a drilling fluid density from geological information, logging information and drilling information of a selected area; obtaining a mud cake penetration rate from drilling fluid penetration experiment information of the selected area; obtaining a rock mechanical parameter from rock mechanical experiment information and the logging information of the selected area; obtaining a supercharging effect force coefficient according to the stratum parameter, the drilling fluid density and the mud cake penetration rate; and substituting the rock mechanical parameter, the stratum parameter and the supercharging effect force coefficient into a hole-wall collapsing pressure model to obtain hole-wall collapsing pressure. According to the method, the hole-wall stress features under drilling fluid environment can be reflected more really, and basis is provided or the selection of reasonable drilling fluid density in the drilling process.

Description

technical field [0001] The invention relates to the field of petroleum drilling, in particular to a method for calculating the well wall collapse pressure considering the pressurization effect stress. Background technique [0002] In the process of oil drilling, in order to prevent the wellbore from collapsing, it is necessary to calculate the minimum density of the drilling fluid in the wellbore to maintain the stability of the wellbore, that is, the collapse pressure. In oil and gas drilling operations, the wellbore collapse pressure value is one of the key supporting information for drilling safety, so it is very important to predict the wellbore collapse pressure. [0003] The calculation of existing wellbore collapse pressure is mainly based on the mechanical parameters of the rock itself, the in-situ stress of the wellbore rock and the original pore pressure. [0004] In the process of realizing the present invention, the inventor has found that there are at least the...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 陈颖杰杨跃明徐婧源马天寿邓传光常洪渠刘欣韩雄刘明哲程曦王宇刘阳
Owner PETROCHINA CO LTD
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