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Method for calculating borehole diameters and clearances during while drilling density logging

A technology of density logging and calculation method, which is applied in the direction of calculation, wellbore/well components, measurement, etc., to achieve the effect of solving the inconvenience of maintenance

Active Publication Date: 2018-09-07
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the use of ultrasonic waves to measure borehole diameter has great limitations.

Method used

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  • Method for calculating borehole diameters and clearances during while drilling density logging
  • Method for calculating borehole diameters and clearances during while drilling density logging
  • Method for calculating borehole diameters and clearances during while drilling density logging

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Embodiment Construction

[0047] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0048] The geometric relationship between the gap and the wellbore and the instrument is as follows: figure 1 shown.

[0049] A method for calculating the caliber and the gap of the density logging while drilling, specifically comprising the following steps:

[0050] Step 1: Obtain mud weight X L and X L The functional relational expression specifically includes the following steps:

[0051] Step 1.1: Use Monte Carlo simulation to simulate the density logging while drilling to obtain the remote density ρ far , formation density ρ b , mud density ρ m and gap size t m value;

[0052] Step 1.2: Using Formula X L =(ρ b -ρ far ) / (ρ b -ρ m ), calculate X L value;

[0053] Step 1.3: Change the gap size t m , formation density ρ b and mud density ρ m , many experiments were carried out to obtain the scatter combination (X L1 , (ρ b -...

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Abstract

The invention discloses a method for calculating borehole diameters and clearances during while drilling density logging, and belongs to the technical field of oil field logging. The method specifically comprises the following steps of: firstly, solving an XL and an XL function relational expression; secondly, solving a clearance size tm; and finally, solving a borehole radius D. According to themethod, in a range of calculating clearances, a measurement dead zone for measuring borehole diameters by utilizing ultrasonic wave can be covered, and the suitable range for slurry is wider than ultrasonic wave-based clearance and borehole diameter measurement; and moreover, considering from the angle of engineering, the method is capable of solving the problem that ultrasonic instruments are inconvenient to maintain, high in maintenance cost and very expensive.

Description

technical field [0001] The invention belongs to the technical field of oil field logging, and in particular relates to a method for calculating well diameter and gap by density logging while drilling. Background technique [0002] In logging while drilling, the change of borehole diameter (borehole size) affects the measurement accuracy of the instrument. It is not only an important parameter to eliminate the influence of porosity logging and lithology density logging borehole, but also can use The amount of cement required for the well, the position of the fracture zone during the oil production process, and the stability of the well wall can be intuitively and vividly reflected, such as diameter shrinkage, landslide sticking, and wellbore expansion during drilling. Traditional wireline logging measures the borehole diameter after the drilling is completed, and measures the borehole size by relying on the push arm to contact the borehole wall during the rising process of th...

Claims

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Application Information

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IPC IPC(8): G06F17/50E21B47/12E21B49/00
CPCE21B47/12E21B49/005G06F30/20G06F2111/10
Inventor 于华伟陈翔鸿周悦
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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