The Effect of Weighting Materials on Oil-Well Cement Properties While Drilling Deep Wells

Ahmed, Abdulmalek; Mahmoud, Ahmed Abdulhamid; Elkatatny, Salaheldin; Chen, Weiqing

doi:10.3390/su11236776

Cited by 28 publications

(24 citation statements)

References 27 publications

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“…The effect of replacing silica flour by the granite waste on the permeability and porosity of the cylindrical cement samples were investigated. For the permeability, it was measured following the Hagen–Poiseuille law and the procedures explained by Sanjuán et al 43 For evaluating the porosity, the Boyle’s law 44 was applied to find the porosity, as explained by Ahmed et al 45 …”

Section: Materials and Methodologymentioning

confidence: 99%

The Use of the Granite Waste Material as an Alternative for Silica Flour in Oil-Well Cementing

2020

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Silica flour is one of the most commonly used material in cementing oil wells at high-temperature conditions of above 230 °F to prevent the deterioration in the strength of the cement. In this study, replacement of the silica flour with the granite waste material at which an inexpensive and readily available material in cementing oil-wells is evaluated. Four cement samples with various amounts of silica flour and granite powder were prepared in this work. The effect of including the granite waste instead of silica flour in the cement elastic, failure, and petrophysical properties after curing the samples at 292 °F and 3000 psi was examined. The results revealed that replacement of the silica flour with 40% by weight of cement (BWOC) optimized the cement performance and confirmed that this concentration of granite could be used as an alternative to the silica flour in oil-well cementing. This concertation of granite slightly improved the elastic properties of the cement. It also improved the cement compressive and tensile strengths by 5.7 and 39.3%, respectively, compared to when silica flour is used. Replacement of the silica flour with 40% BWOC of granite waste also reduced the cement permeability by 64.7% and porosity by 17.9%.

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Section: Materials and Methodologymentioning

confidence: 99%

The Use of the Granite Waste Material as an Alternative for Silica Flour in Oil-Well Cementing

2020

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“…Most often, the quality and the quantity of the mud cake left on the opening wall deteriorate the sealing efficiency of the pipe column. Therefore, the most important step is thorough washing of the annular space before the cementation procedure [1,2,5,7,10,[28][29][30]. In addition, the issue that affects the quality of sealing the annular space is the adhesion of the hardened cement slurry to the rock through the remains of the remaining mud cake.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Washer Fluid for Primary Cementing

Kremieniewski

2021

Energies

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This article presents the results on the basis of which a new hybrid drilling washer fluid was designed. The use of fluid from such a drilling washer increases the mud-cake removal efficiency. Its operation is based on both chemical and mechanical removal of the mud cake. This article presents a group of agents and admixtures of various solid fractions, the appropriate selection of which enabled the design of a hybrid drilling washer fluid. The liquid has much better washing parameters than the drilling washers used so far. The tests were carried out in a drilling fluid flow simulator. A significant improvement in the scrubbing mud-cake removal efficiency resulted from the action of surfactants and fine-grained abrasive additives. Their proper concentration was also very important. The hybrid drilling washer fluid was designed on the basis of tests measuring the adhesion of the hardened cement slurry to the rock from which the previously produced mud was removed. In this way, the effectiveness of the washing liquids was determined. Upon analyzing the obtained results and correlating them with the reference samples, one can see a significant improvement in the efficiency of the removal of the drilling sediment by the hybrid drilling washer fluid. The hybrid drilling washer fluid is an innovative solution because it combines chemical and mechanical action in the removal of drilling fluid. Additionally, such a washing liquid has not been used so far.

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“…However, it is also important to use wash flow conditions that do not cause fractures in the formation, which can occur when the pumped fluid at the bottom of the borehole becomes excessively high due to a high delivery rate. Sufficient contact time between the wash and the annular space is necessary, as this allows the mud to be effectively removed [5][6][7][8][9]. Cleaning the borehole prior to cementing is essential for many reasons [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Efficiency of Sealing the Borehole in Terms of Spacer Pumping Time

2021

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The tightness of a borehole is essential for its long-term durability. For this purpose, the column of the pipe is sealed with cement slurry. After contacting the slurry, mud in the borehole is removed. However, the slurry does not effectively remove the remaining drilling mud. Therefore, the annular space is cleaned with a wash. Effectively cleaning the borehole presents quite a problem, as many variables that affect the stability of the borehole need to be considered. The time of contact between the borehole and the wash is very important. On the one hand, insufficient contact time does not guarantee proper removal of the mud. On the other hand, a long contact time may destroy the wall of the borehole. To address these problems, studies were carried out to assess the effect of the wash contact time on annular space cleaning. When determining the time of washing, a compromise between effective cleaning and the stability of the borehole wall is required. In the research presented in this publication, the simplest wash was used, i.e., water. This choice was based on the objective of observing the influence of the wash time on cleaning, i.e., the preparation of the borehole for cementing. By using water, the physicochemical action of surfactants can be ignored. In order to capture changes in cleaning due to differences in contact time, a control test was performed using a pure sandstone core without mud. The effect of the wash contact time on the cleaning of the annular space was investigated by determining the adhesion of the cement sheath to the rock core. First, mud was formed on the core, and then it was removed. By comparing the obtained adhesion to the reference sample, the effectiveness of the deposit removal was determined. On the basis of this research, the optimal wash contact time was determined.

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The Effect of Weighting Materials on Oil-Well Cement Properties While Drilling Deep Wells

Cited by 28 publications

References 27 publications

The Use of the Granite Waste Material as an Alternative for Silica Flour in Oil-Well Cementing

The Use of the Granite Waste Material as an Alternative for Silica Flour in Oil-Well Cementing

Hybrid Washer Fluid for Primary Cementing

Increasing the Efficiency of Sealing the Borehole in Terms of Spacer Pumping Time

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