While-drilling ultrasonic borehole diameter data correction method

A data correction and ultrasonic technology, applied in special data processing applications, earthwork drilling, wellbore/well components, etc., can solve the problems of poor data reliability and low correction accuracy, and achieve the effect of improving reliability

Pending Publication Date: 2021-01-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems of low correction accuracy and poor reliability of evaluation data

Method used

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  • While-drilling ultrasonic borehole diameter data correction method
  • While-drilling ultrasonic borehole diameter data correction method
  • While-drilling ultrasonic borehole diameter data correction method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A method for correcting ultrasonic caliper data while drilling, comprising the following steps:

[0033] a. In a depth interval, use the ultrasonic caliper tool while drilling to measure the caliper and collect the ultrasonic caliper waveform;

[0034] b. At a depth point, the arrival time t of the borehole reflection wave and the energy E1 of the borehole reflection wave are extracted by the energy envelope method, and the borehole diameter r is calculated according to the arrival time t of the borehole reflection wave and the ultrasonic wave velocity v in the well fluid.

[0035]

[0036] c. Use the transmitted wave energy E2 to normalize the borehole wall reflected wave energy E1 to obtain the actual attenuation coefficient k;

[0037] k=E1 / E2 Formula 2

[0038] d. Establish a physical model based on the excitation frequency, mud parameters, formation parameters, tool size, and borehole caliper r during the actual caliper logging while drilling, use finite differ...

Embodiment 2

[0043] A method for correcting ultrasonic caliper data while drilling, comprising the following steps:

[0044] a. In a depth interval, use the ultrasonic caliper tool while drilling to measure the caliper and collect the ultrasonic caliper waveform;

[0045] b. At a depth point, the arrival time t of the borehole reflection wave and the energy E1 of the borehole reflection wave are extracted by the energy envelope method, and the borehole diameter r is calculated according to the arrival time t of the borehole reflection wave and the ultrasonic wave velocity v in the well fluid.

[0046]

[0047] c. Using the transmitted wave energy E2 to normalize the borehole wall reflected wave energy E1 to obtain the actual attenuation coefficient k,

[0048] k=E1 / E2 Formula 2

[0049] d. Establish a physical model based on the excitation frequency, mud parameters, formation parameters, tool size, and borehole caliper r during the actual caliper logging while drilling, use finite diff...

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Abstract

The invention discloses a while-drilling ultrasonic borehole diameter data correction method, and belongs to the technical field of oil and gas drilling. The method is characterized by comprising thefollowing steps of a, acquiring an ultrasonic borehole diameter waveform; b, conducting calculation to obtain a borehole diameter r; c, conducting normalization to obtain an actual attenuation coefficient k; d, establishing a physical model, and calculating a theoretical attenuation coefficient k1; e, obtaining an actually measured confidence interval [k-epsilon, k+epsilon] according to a design error epsilon of a while-drilling ultrasonic borehole diameter instrument; f, comparing the theoretical attenuation coefficient k1 with the confidence interval, and correcting the depth point boreholediameter data; and g, traversing a whole depth interval. According to the method, the reliability of the data can be evaluated, and the data with low reliability can be corrected, so that the reliability of the ultrasonic borehole diameter data can be greatly improved, and a guarantee is provided for borehole stability evaluation.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a method for correcting ultrasonic borehole diameter data while drilling. Background technique [0002] There are many types of caliper, and the measurement principles are not the same. There are mainly resistive, inductive and sonic caliper. There are two main structures of the caliper: one is the open-arm caliper for independent caliper measurement; Well tools and micro laterometry tools, taking measurements while these tools are logging wells. With the development of drilling technology, real-time acquisition of well diameter parameters during drilling is very important to ensure drilling safety. [0003] At present, the calculation methods of borehole diameter mainly include envelope method and multiple echo calculation method. These two methods are greatly interfered by cuttings scattering, and the true borehole diameter cannot be accurately obtained when th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/085E21B47/14G06F30/20
CPCE21B47/14G06F30/20
Inventor 李雷韩烈祥谢意李枝林张继川陈俊斌万夫磊贾利春黄焰周杨段慕白曾鹏宇郑海波
Owner BC P INC CHINA NAT PETROLEUM CORP
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