Semantic Scholar extracted view of "Compressive Strength and Hydration Products of Oil Well Cement Mixed with Fly Ash at Ultra-high Temperature" by Renggugang Liu et al.
Fly ash based geopolymer cement has been recently investigated as a low-cost, environmentally friendly alternative to Portland cement. This research develops a novel formulation of Class C fly ash based geopolymer and investigates its applicability as an alternative to Portland cement in hydrocarbon well cementing.
Class F fly ash-based alkali activated materials (AAMs) have shown promising strength and durability properties for oil- and gas-well cementing applications. Furthermore, they provide a sustainable and cost-effective means to dispose of non-aqueous drilling fluids and replace ordinary Portland cements for cementing purposes.
The compressive strengths and hydration products was investigated of oil well cement mixed with fly ash at ultra-high temperatures. Cured at 150°C, the strength for test samples with 30% and 50% fly ash was relatively high in the early days but declined in subsequent days. However, the samples with 70% fly ash showed a continuous trend.
Fly ashes have found utility in numerous oil and gas well cementing applications, namely: 1) fly ash can be dry-blended with regular Portland cements or hydrated lime for use in primary cementing; 2) lightweight cement compositions can be formulated by adding lime and finely ground quartz to fly ash/cement mixtures; and 3) an ultralight-weight ...
Incorporation of nano-silica ensures proper cementation and greater integrity of the well. Nano-silica helps in decreasing the wait on cement (WOC) time and therefore reduces the overall capital cost. Nano-silica is highly recommended for deep offshore wells where high temperature and high pressure are often encountered.
Acidizing is a widely used technique to stimulate an oil well in order to enhance its production. When portland cement is placed in contact with acid fluids, it will dissolve and, at some time, will be fully degraded because the acids have reacted with calcium silicate hydrate which resulted in the breaking up of the cement intergranular …
On the contrary, some cement systems with 4-A1 zeolite and fly ash exhibited a mechanical resistance increase due to the carbonation process.
The conclusion supports the usage of geopolymer cement for oil well cementing whereby it has an edge over conventional Portland cement for better short term and long term performance to ensure ...
Beneficiation of South African coal-fly ash in oil well cement operation, In: Proceedings of 1st International Conference on Oilfield Chemistry & Flow Assurance.
The conclusion supports the usage of geopolymer cement for oil well cementing whereby it has an edge over conventional Portland cement for better short term and long term performance to ensure ...
This research focuses on the formulation of geopolymer cement to be used in oil well cementing application by taking account the effect of sodium hydroxide (NaoH) molarity, ratio of alkali binder and fly ash, amount of dispersant for oilwell operation under temperature ranging of 80°C and 90C° and pressure of 1000 and 3000psi.
This study firstly proposed a new adaptive method based on gradient boosted regression trees (GBRT) for predicting compressive and shear bond strength, Secondly, we identified the optimum concentration of fly ash class F to be used as an alternative to standard Portland cement in oil well cement at 80 °C. In the third place, …
All laboratory tests were carried out according to API RP 10B-2 practices for oil well cement. Results were compared against conventional Fly Ash based cement systems. The laboratory test results show that HR-FAM based blends provide better mechanical properties than regular Fly Ash in terms of compressive strength development.
This study opened up new insights into the distinct roles that GBFS and fly ash play in mitigating strength retrogression of oil well cement systems. The properties of the various oil well cement systems evaluated include compressive strength, water permeability, microstructure and mineral compositions, etc.
The exploration of the elastomeric expandable additive (R-additive) and its influence on fly-ash-based strength-enhanced geopolymer cement (GPC) samples addresses a notable gap in current literature, offering valuable insights into optimizing cement formulations for enhanced performance in petroleum well environments.
An alternative cement system created through geopolymerization of fly ash offers favorable properties such as able to resist acidic fluids and possess high compressive strength. However, the application of fly ash geopolymer as wellbore cement under carbon dioxide (CO2) environment at elevated temperature is not well recorded in the literature. …
This research studied the ability of a novel fly ash-based and resin-reinforced cement to resist degradation under the extreme conditions of oil and gas wells. The cement was tested under acidic, basic, high-temperature and -pressure, and high-salinity conditions.
Semantic Scholar extracted view of "Fly ash Class C based geopolymer for oil well cementing" by Mohamed Ahdaya et al.
Class F fly ash-based alkali activated materials (AAMs) have shown promising strength and durability properties for oil- and gas-well cementing applications.
In this study the Influence of fine mineral additives such as zeolite tuff, metakaolin, microspheres and fly ash on the properties of light-weight oil-well cement was investigated. Strength, physical and performance requirements of light-weight oil-well cements were determined. The results have shown that the most effective facilitating ...
Ensuring oil-well-integrity is one of the challenging tasks when cementing is designed. It has been well established that cement tends to degrade when exposed to a corrosive environment and at elevated temperatures. This paper presents the results of the uniaxial compressive strength of the qualified mixes of geopolymer cement containing …
This work presents a new class of geopolymers using both hematite and Micromax as weighting materials for high density well cementing applications.
In this paper, the resistance to H2S attack of pastes made from slag-fly ash blended cement used in oil well (SFAOW) was studied, in which fly ash (FA) was used at replacement dosages of 30% to 60% by weight of slag.
Abstract. One of the most important steps in drilling and operation completion is oil well cementing to provide wellbore integrity. Cementing is usually performed in the oil industry using conventional Portland cement. Even though Portland cement has been used for many years, it has several drawbacks, including operational …
Results show that fly ash-based geopolymer cement with 1 wt% of Nano-silica additive was the least affected cement samples after acid treatment as compared to a similar weight of Class G OPC. Keywords Geopolymer ·Fly ash ·Nano-silica · Oil well cement ·Microstructures · Acid
The use of fly ash in geopolymer based cement can affect the performance of the cement slurry by its properties which yet needs proper study to yield better advantages of it.In this research, the ...
Ryu et al. [5] had conducted a study to investigate the mechanical properties of fly ash-based gepolymer cement where it is found that this type of cement is more suitable for precast concrete ...
Typical applications of alkali-activated materials are within civil engineering, however, potential applications as well cementing material within oil & gas are also being studied with emerging ...
A recycled material that enhances your mix, Fly Ash is a fine powder that comes from coal combustion, typically resulting from power generation, and one of the most commonly used pozzolans in the construction industry. Pozzolans are siliceous or siliceous/aluminous materials which can form cementitious compounds when mixed with …
Effect of Elastomeric Expandable Additive on Compressive Strength and Linear Expansion of Fly-Ash-Based Strength-Enhanced Geopolymer Cement for Shrinkage-Resistant Oil-Well Cementing
This research focuses on the formulation of geopolymer cement to be used in oil well cementing application by taking account the effect of sodium hydroxide (NaoH) molarity, ratio of alkali binder ...
