Improvement in the method for borehole caliper measurement based on azimuthal gamma-gamma density well logging

Liu, Juntao; Wu, Hao; Zhang, Feng; Liu, Shucai; Liu, Zhixin; Yan, Huizhong

doi:10.1016/j.apradiso.2018.12.014

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…The amount of attenuation is inversely proportional to the number of γ-rays reaching the detector(s). The industrial and laboratory settings of how NaI:Tl are used to measure density can be found elsewhere (John, 1997;J et al, 2019) and (Margret et al, 2015;Ashrafi et al, 2014) respectively.…”

Section: Gamma-ray Density Toolmentioning

confidence: 99%

Radiation detectors for nuclear well-logging application: A review

Bala¹,

Jenkins²,

Namadi³

2022

dujopas

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The oil and gas industry uses nuclear logging method to survey for the presence of hydrocarbons in a given region of interest. Nuclear logging tools are used to achieve this aim. These tools consist of radiation sources and radiation detectors. 3He thermal neutron detector and NaI:Tl for gamma-ray measurements are the conventional detectors used for this application. However, the shortage of 3He gas used in 3He tube and the high demand for both detectors in many other societal applications has mandated the search for alternative radiation detectors. This paper reviewed other alternatives that are commercially available. Light output, temperature sensitivity, tolerance to vibration and shock are important parameters to consider when selecting a detector for this application. Among the reviewed alternatives, GS20 crystal for neutron and gamma ray measurements, LaBr:Ce and LuYAP:Ce for gamma ray measurement have been reported to have comparable performance to the conventional detectors.

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Section: Gamma-ray Density Toolmentioning

confidence: 99%

Radiation detectors for nuclear well-logging application: A review

Bala¹,

Jenkins²,

Namadi³

2022

dujopas

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“…The posture of the drill string constantly changes over time due to the various stress conditions of the bottom hole assembly (BHA). For the measurement of gamma imaging, neutron density, and electromagnetic resistivity, the eccentricity distance has a great influence on the measurement results [13][14][15][16][17][18][19]. In order to obtain the real formation information accurately, modified maps of the sensors with different eccentricity distances are given.…”

Section: Introductionmentioning

confidence: 99%

Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout

Wang

2021

Sensors

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The drill string used in drilling is in a complex motion state downhole for several kilometers. The operating attitude and eccentricity of the downhole drill string play important roles in avoiding downhole risks and correcting the output of the imaging measurement sensor while drilling (IMWD). This paper proposes a method for measuring eccentricity while drilling using two sets of caliper sensors coupled with a fiber-optic gyroscope for continuous attitude measurement, which is used to solve the problem of the quantitative measurement of complex eccentricity that changes in real-time downhole. According to the measurement and calculation methods involved in this article, we performed simulations of the attitude of the drill string near where the IMWD tool is located in the wellbore under a variety of complex downhole conditions, such as centering, eccentricity, tilt, buckling, rotation, revolution, etc. The simulation and field test results prove that the distance between the imaging while drilling sensor and the borehole wall is greatly affected by the downhole attitude and revolution. The multi-sensor layout measurement scheme and the data processing based on the above-mentioned measurement involved can push the drill collar movement and eccentricity matrix specifically studied downhole from only qualitative estimation to real-time measurement and quantitative calculation. The above measurement and data processing methods can accurately measure and identify the local operating posture of the drill string where the IMWD sensor is located, and quantitatively give the eccentric distance matrix from the measuring point to the borehole wall required for environmental correction of the IMWD sensor.

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“…The Compton scattered photons can also be used for imaging purposes [6][7][8][9][10][11][12], i.e., for inspection of vehicles or passengers at the airports [13]. This scattering mechanism has also been employed in the production of gamma-gamma well logging systems in oil exploration [14][15][16][17] and for determination of materials thickness or corrosion [18,19].…”

Section: Introductionmentioning

confidence: 99%

A new method for measuring the space between two metal plates using a Compton backscattering method

Sasanpour¹,

Taheri²,

Askari³

2020

J. Inst.

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A: Determining the space between two metal plates by accessing only one side of the configuration can be difficult, especially when we are not able to use methods with the need to have direct contact with the plates. In such a condition, using gamma-ray based approaches can be beneficial. In this paper, a new method based on Compton scattering of the gamma-rays was proposed to measure the gap between two metal plates and the related challenges were studied. Steel plates with 1, 4, and 10 mm thicknesses were selected to test the proposed method. The results showed that this method needs a low activity gamma-ray source and can be employed successfully for this purpose. It was found that the accuracy of the method the thickness of the plates and the distance between them. K: Inspection with gamma rays; Radiation monitoring 1Corresponding author.

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Improvement in the method for borehole caliper measurement based on azimuthal gamma-gamma density well logging

Cited by 10 publications

References 9 publications

Radiation detectors for nuclear well-logging application: A review

Radiation detectors for nuclear well-logging application: A review

Research on a Measurement Method for Downhole Drill String Eccentricity Based on a Multi-Sensor Layout

A new method for measuring the space between two metal plates using a Compton backscattering method

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