Beyond Steel Casing: Detecting Zonal Isolation in the Borehole Environment

Eltsov, Timofey; Patzek, Tadeusz W

doi:10.2118/195036-ms

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…Oil and gas companies annually spend huge amounts of money to eliminate them, but the success rate of these works does not exceed 40% (Figure 1). The results of early studies [1,2,3] revealed the existence of effective technologies for solving this problem. However, the applicability of these results and products is limited by their cost and conditions of use, as only the payback of the proposed technologies requires an increase of oil production no less than 250 tons/day from each well, while in the conditions that are investigated in this work, the maximum level of oil production that the company produces from one well is no more than 5-6 tons/day.…”

Section: Introductionmentioning

confidence: 99%

Improving the efficiency of well workover solutions for the elimination of behind-the-casing flows

Rakhmaev

Odayev

2021

E3S Web Conf.

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The article deals with the increase of profitability of water shutoff treatment (WST), which is used to eliminate behind-the-casing flows (cross-flow) in production and injection wells. It is presented that modern technologies of water shut-off works have low efficiency (success rate), especially in liquidation of non-perforating interval. Inefficient (wasteful) injection is currently one of the main problems in the development of oil and gas fields, as it significantly reduces the oil recovery factor in addition to the huge costs for oil companies for injection (operating costs). The article presents the results of hydrodynamic research and proposes methods for determining the presence of behind-the-casing flows (BCF) and methods for detecting wasteful injection without geophysical well-logging (a non-standard approach). The article also presents equipment for the elimination of the behind-the-casing flow and technology of its implementation.

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Section: Introductionmentioning

confidence: 99%

Improving the efficiency of well workover solutions for the elimination of behind-the-casing flows

Rakhmaev

Odayev

2021

E3S Web Conf.

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“…For GFRP we can assume 𝜇 = 𝜇 [20], and the range of the reflection wave coefficient is Modern turbine blades are often made of GFRP material with εr = 4.2, for which the reflectance is approx. 9 dB.…”

mentioning

confidence: 99%

“…To compare the RCS formula for Annex 2 with the formula for Annex 1 (13), we can convert the Equation (20) to…”

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confidence: 99%

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Radio Channel Modelling for VHF System Operating in the Offshore Wind Farms Propagation Environment

Bronk,

Koncicki,

Lipka

et al. 2023

Sensors

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This article discusses several aspects related to the modeling of the radio channel in the wind farm propagation environment. The first part of the article is filled with the analysis of the ITU-R BT.1893-1 model, which—as will be shown—is also applicable to systems operating in the VHF and UHF bands. The conducted measurement campaign makes it possible to model a radio channel for VHF operating systems in the wind farm propagation environment. Thanks to the obtained results, the authors propose the VHF radio channel model for that environment. Using the software implementation of this model, the authors carry out a detailed simulation analysis of the impact of wind turbines on radio systems operating in the VHF band. The main motivation for this work is the growing importance of the offshore wind energy in general, numerous investments in that area in Poland, and the lack of existing mathematical models regarding the wind farms’ impact on the VHF systems. The VHF band is of special interest here, as this part of the spectrum is utilized by numerous marine administration and border protection radio systems, which can be adversely affected by the wind turbines (due to interference and/or radio shadowing).

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“…The evaluation of cement integrity is of primary importance to the oil and gas industry [9]. Poor cementation can lead to costly accidents and serious damage to the environment.…”

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confidence: 99%

Beyond Carbon Steel: Detecting Wellbore Shape and Cavities, and Cement Imperfections in Cased Wells

Eltsov

Patzek

2019

Energies

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The non-corrosive, electrically resistive fiberglass casing materials may improve the economics of oil and gas field projects. At moderate temperatures (<120 °C), fiberglass casing is superior to carbon steel casing in applications that involve wet CO2 injection and/or production, such as carbon capture and storage, and CO2-based enhanced oil recovery (EOR) methods. Without a perfect protective cement shell, carbon steel casing in contact with a concentrated formation brine corrodes and the fiberglass casing is superior again. Fiberglass casing enables electromagnetic logging for exploration and reservoir monitoring, but it requires the development of new logging methods. Here we present a technique for the detection of integrity of magnetic cement behind resistive fiberglass casing. We demonstrate that an optimized induction logging tool can detect small changes in the magnetic permeability of cement through a non-conductive casing in a vertical (or horizontal) well. We determine both the integrity and solidification state of the cement-filled annulus behind the casing. Changes in magnetic permeability influence mostly the real part of the vertical component of the magnetic field. The signal amplitude is more sensitive to a change in the magnetic properties of the cement, rather than the signal phase. Our simulations showed that optimum separation between the transmitter and receiver coils ranged from 0.25 to 0.6 m, and the most suitable magnetic field frequencies varied from 0.1 to 10 kHz. A high-frequency induction probe operating at 200 MHz can measure the degree of solidification of cement. The proposed method can detect borehole cracks filled with cement, incomplete lift of cement, casing eccentricity, and other borehole inhomogeneities.

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Beyond Steel Casing: Detecting Zonal Isolation in the Borehole Environment

Cited by 4 publications

References 12 publications

Improving the efficiency of well workover solutions for the elimination of behind-the-casing flows

Improving the efficiency of well workover solutions for the elimination of behind-the-casing flows

Radio Channel Modelling for VHF System Operating in the Offshore Wind Farms Propagation Environment

Beyond Carbon Steel: Detecting Wellbore Shape and Cavities, and Cement Imperfections in Cased Wells

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