Borehole diameter expanding ratio calculation method and device

A calculation method and technology of a calculation device, which are applied in the directions of calculation, drilling equipment and methods, drilling equipment, etc., and can solve problems such as inability to meet requirements

Active Publication Date: 2017-05-17
PETROCHINA CO LTD
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Problems solved by technology

There have been literatures that can calculate the drilling fluid density that can maintain the expansion rate of 0% (that is, the formula for calculating the collapse pressure), but in fact, once the wellbore expansion needs to be ca...

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  • Borehole diameter expanding ratio calculation method and device
  • Borehole diameter expanding ratio calculation method and device
  • Borehole diameter expanding ratio calculation method and device

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Embodiment Construction

[0041] 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.

[0042] An embodiment of the present invention provides a method for calculating the borehole diameter expansion ratio, such as figure 1 shown, including:

[0043] Step S1: Obtain the linear elastic parameters of the sampled rocks on the borehole wall through laboratory experiments;

[0044] Step S2: Obtain the plastic parameters of the sampled rocks on the well wall through laboratory experiments;

[0045] Step S3: Obtain the basic stress parameters of the borehole wall through formation data;

[0046] Step S4: Calculate the borehole diameter expansion rate according to the linear elastic parameters, plastic parameters, foundation stress parameters and drilling fluid density.

[0047] Among them, the linear elastic parameters of the sampled rock on ...

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Abstract

The invention provides a borehole diameter expanding ratio calculation method and device. The method includes the steps: acquiring linear elastic parameters of sampling rocks of a well wall by indoor experiments; acquiring plastic parameters of the sampling rocks of the well wall by the indoor experiments; acquiring basic stress parameters of the well wall by stratum data and the indoor experiments; calculating borehole diameter expanding ratio according to the linear elastic parameters, the plastic parameters, the basic stress parameters and drilling fluid density. The borehole diameter expanding ratio of a bored well can be obtained under the condition of given drilling fluid density, so that reasonable drilling fluid density can be accurately selected and set, and technical support is provided for high-quality and high-speed drilling.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a method and device for calculating the diameter expansion rate of a borehole. Background technique [0002] In the process of oil drilling, on the one hand, in order to increase the drilling speed, a smaller drilling fluid density is required; on the other hand, in order to prevent wellbore collapse, it is necessary to maintain an appropriate drilling fluid density. At present, the usual practice is to use "collapse pressure" as the allowable minimum density of the wellbore drilling fluid, that is, the drilling fluid density just enough to maintain the balance of the wellbore wall. 30%, the drilling can still be maintained. Obviously, it is conservative to use the "collapse pressure" as the basis for designing the minimum drilling fluid density, which is not conducive to the demand for drilling speed increase. [0003] For the calculation of borehole diameter expansi...

Claims

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Application Information

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IPC IPC(8): G06F19/00E21B7/28
CPCE21B7/28G16Z99/00
Inventor 陈颖杰徐婧源邓传光韩雄刘阳程曦袁和义
Owner PETROCHINA CO LTD
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