Microannulus and Cement Evaluation: Effectiveness of Cement Evaluation Using Sonic and Ultrasonic Technologies in Wells with Microannulus Between Casing and Cement Sheath (Russian)

Timonin, Andrey; Lungershausen, Dirk; Kravets, Petr

doi:10.2118/172309-ru

SPE Annual Caspian Technical Conference and Exhibition 2014

DOI: 10.2118/172309-ru

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Microannulus and Cement Evaluation: Effectiveness of Cement Evaluation Using Sonic and Ultrasonic Technologies in Wells with Microannulus Between Casing and Cement Sheath (Russian)

Andrey Timonin¹,

Dirk Lungershausen²,

Petr Kravets³

Abstract: Микрозазоры и оценка качества цементирования: Эффективность оценки качества цементирования акустическими и ультразвуковыми приборами в скважинах с микрозазором между обсадной колонной и цементным кольцом Тимонин Андрей, Шлюмберже; и Лунгерсхаузен Дирк и Кравец Петр, ТОО Жаикмунай Авторское право 2014 г., Общество инженеров нефтегазовой промышленности Этот доклад был подготовлен для презентации на Ежегодной Каспийской технической конференции и выставке SPE, 12 -14 ноября, 2014, Астана, Казахстан.Данный доклад б… Show more

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Cited by 6 publications

References 3 publications

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Smart Expandable Polymer Cement Additive to Improve Zonal Isolation

Santos

Taleghani

2018

SPE/AAPG Eastern Regional Meeting

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One of the critical issues that might happen in some oil and gas wells is the failure of the cement sheaths and its debonding from the casing string. Cement shrinkage during setting is regarded as one of the main causes behind formation of microannulus cracks. In this paper, a new class of polymer-based expandable additives is presented in the form of fibers to address shrinkage and debonding issues in the subsurface. The proposed fiber additives are made from shape memory polymers. These fibers expand upon exposure to temperatures above certain limits; which is selected to be below the temperature of the cementing zone. In this situation, the expansion occurs before the cement setting but after its placement. If the expansion occurs after cement setting, it may lead to microfractures. As a result of the controlled expansion of the cement paste, the creation of channels and fluid migration can be minimized while maintaining the mechanical properties required for cement integrity. Considering the inert property of the proposed additive, the cement water ratio and its chemical properties do not change. The cement expansion, fluid loss, gel strength, compressive strength, and tensile strength of the samples containing these fibers are examined by destructive and non-destructive methods and presented here. The proposed class of expandable additives can help the operators reach sustainable well integrity by improving the bonding between the cement and casing.

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Smart Expandable Polymer Cement Additive to Improve Zonal Isolation

Santos

Taleghani

2018

SPE/AAPG Eastern Regional Meeting

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Cement Evaluation in Highly Laminated and Multi-Stacked Sandstone Reservoirs: The World First Novel Approach Using Dual-Physics Cement Bond Assessment

Zulkipli

Das

Smith

2021

Day 2 Tue, November 16, 2021

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Advances in cement recipe, additives and cementing technology including light weight cement, ultra-low fluid loss cement blend and improved cement to mud rheology mixing to seal the continuous liquid channels have prompted the industry to find an innovative way to evaluate the cement bond and integrity with a more robust and integrated approach. Evaluating cement bond behind casing based on single tool platform had shown some inherent uncertainties mainly due to borehole effects, tool eccentralization and processing variation. This paper will highlight few case studies on the application of both electromagnetic acoustic wave (EMAT) and ultrasonic cement evaluation logs including the world's first tool combination in single run to enhance understanding on cement integrity and optimize the perforation interval for production. Channeling and microannulus occurrences whether dry or wet are the most common features in cement integrity evaluation and yet poorly characterized to prevent any unwanted cross-flow or adverse impact to production. Electromagnetic acoustic wave cement evaluation in combination with an ultrasonic tool allow direct quantification of compressional, shear and flexural attenuation properties of cement downhole as well as acoustic impedance and microdebonding feature of the cement. Separation between average shear and flexural attenuation curves may indicate presence of microannulus depending on the extent of the separation without any requirement of additional pressurized logging pass. Parameter threshold determination based on shear and flexural attenuation cross-plot also indicates severity of cement microdebonding. Results showed that good production rate with lower water cut and low GOR reading had been achieved from specific perforated zones in the well. Electromagnetic acoustic wave and ultrasonic cement evaluation tools had successfully defined the zonal isolation layers as thin as 2 to 3 meters along the wellbore and optimized the perforated zones to avoid any liquid channeling or premature water and gas breakthrough into the wells, which can affect the production attainability and drainage efficiency from particular reservoirs. In a nutshell, combination of EMAT acoustic wave and ultrasonic cement evaluation principles prove to provide a more comprehensive overview on the cement bond integrity behind the casing. Having two independent downhole measurement which complement each other will reinvent the effort in cement bond assessment for complex reservoir environment which is susceptible to interpretation ambiguity.

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Materials for Well Integrity – Rheological Behavior Study

Kamali

Khalifeh

Saasen

et al. 2022

Day 1 Wed, April 27, 2022

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Ordinary Portland cement has been the prime material used for well cementing and permanent well- abandonment. Occasionally, the properties of the Portland cement can be inadequate to fulfil the necessary requirements. Hence, alternative barrier materials have been suggested for use in primary cementing and permanent well-abandonment. Among these, geopolymers, expansive cement, pozzolan based material, and thermosetting resins can be good alternatives. This article presents the fluid properties and rheological behavior of the above-mentioned alternative materials. API neat class G cement is used as a reference material to compare the obtained results. Through this study, the bottom-hole circulating temperature (BHCT) and bottom-hole static temperature (BHST) are selected to be 65 and 90°C, respectively. The pressure is 2500 psi. These conditions are representative for most wells on the Norwegian continental shelf. The initial results include viscosity profile at BHCT, the effect of pressure on thickening time, and intensity of static fluid loss. Our results show that the barrier materials have their pros and cons. One material might be good for an application such as a squeeze cementing job while the other one may not fit this application. The viscosity measurements showed all the candidate barrier materials to be shear-thinning to some degree. Except for the pozzolan based sealant, all other selected materials presented right angle set and pressure- dependent consistency.

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Microannulus and Cement Evaluation: Effectiveness of Cement Evaluation Using Sonic and Ultrasonic Technologies in Wells with Microannulus Between Casing and Cement Sheath (Russian)

Cited by 6 publications

References 3 publications

Smart Expandable Polymer Cement Additive to Improve Zonal Isolation

Smart Expandable Polymer Cement Additive to Improve Zonal Isolation

Cement Evaluation in Highly Laminated and Multi-Stacked Sandstone Reservoirs: The World First Novel Approach Using Dual-Physics Cement Bond Assessment

Materials for Well Integrity – Rheological Behavior Study

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