Abstract Accelerators are important cementing additives in deepwater wells where low temperatures can lengthen the wait-on-cement (WOC) time, potentially increasing cost of operations. The cement set accelerators traditionally used for shortening WOC times inorganic salts, such as CaCl2. These known to have negative side effect permeability. Nanosilicas, on other hand, be advantageous compared conventional because they reduce permeability while mechanical strength cement-based materials. For...

Abstract Annular sealants are used as static barriers to avoid fluid communication in-between zones and provide proper isolation of the different formations well support protection casing. Therefore, sealant can have a direct relationship wellbore integrity. Data suggest more than 4 million hydrocarbon wells been drilled globally; interestingly, some datasets indicate integrity failure is highly variable (1.9 75%). Historically, characterized for short-term placement properties up point at...

Summary Foamed-cement systems are widely used in deepwater-cementing operations because of their various favorable attributes compared with conventional cement systems. For instance, the Gulf Mexico, foamed is one most commonly for shallow-hazard mitigation. However, current standard laboratory equipment cannot accurately simulate foam-cementing process field, knowledge actual properties produced field limited. In this study, microstructure by use yard tests examined detail. Set...

Summary During the cementing operations of oil wells, there are many situations in which it is crucial to regulate temperature cement slurry during and after its placement. Limiting rise cement-based composite materials was traditionally achieved by reducing heat hydration (e.g., through use supplementary cementitious or inert filling materials). However, total amount generated a primarily determined extent that has strong correlation with composite's strength development. Reducing oilwell...

Summary In this study, we describe an innovative and novel methodology comprising a high–pressure/high–temperature (HP/HT) in–situ–triaxial–testing apparatus for the measurement of sealant mechanical properties (i.e., compressive strength, Young's modulus, tensile strength) under simulated downhole conditions. The equipment can be used to perform both curing testing using same apparatus, thus eliminating depressurization cooling test specimens. Additionally, at minimum, three samples tested...

The formation of 1D and 3D transition metal oxide (TMO) nano- micron-size structures on molybdenum, iron tungsten probes inserted in a counter-flow flame is studied experimentally. unique thermal profile chemical composition the generated tends to convert almost pure bulk (99.9%) materials into architectures. synthesised Mo-, Fe- W-oxide exhibit morphological characteristics. application Mo results hollow solid Mo-oxide channels. nanorods observed probes. use W synthesis carbon/metal...

Abstract Understanding the heat transfer phenomena encountered in extreme oil and gas reservoir environments [i.e., thermal recovery, high-pressure/high-temperature (HP/HT), deepwater, etc.] geothermal wells is important to enhance exploration production of subterranean energy resources. However, there can be a lack information about properties current oilwell cement systems, which are key inputs for any sheath stress simulator that accounts cycling effect on integrity annular sealant....

Abstract Long-term wellbore integrity is an increasingly important factor that directly affects hydrocarbon production and optimized-wellbore economics. The industry shift toward drilling in harsher conditions, including high-pressure/high-temperature (HP/HT), deepwater, unconventionals, mature fields/high-temperature (HT) oil-recovery techniques, etc., as well increasing regulatory scrutiny, has made operations even more challenging. Zonal isolation typically achieved by placing annular...

Abstract Foamed cement has provided zonal isolation in oil and gas wells since the 1980s. However, lack of an experimental technique that fully characterizes foamed properties is limiting its application. This study uses X-ray microcomputed tomography (micro-CT) to elucidate relationships between foaming process, microstructure or morphology, macroscopic performance material’s mechanical properties. During this study, slurries were prepared using a traditional multiblade laboratory blender...

Abstract Cement is a critical component in an oil well because it provides sealing and zonal isolation within the well. To help ensure proper performance of cementing operation, various evaluation techniques/tools have been developed used over years, including some based on ultrasonic pulse echo technology. Ultrasonic tools can play key role determining in-situ cement if any remedial required. As gas industry continues to migrate toward more challenging reservoirs with increasingly harsh...

Abstract Foamed-cement systems are widely used in deepwater cementing operations because of their various favorable attributes compared to conventional cement systems. For instance, the Gulf Mexico, foamed is one most commonly for shallow hazard mitigation. However, current standard laboratory equipment cannot accurately simulate foam-cementing process field, knowledge actual properties produced field limited. In this study, microstructure using yard tests examined detail. Set samples were...

Abstract Cementing operations consists of placing cement slurries between casing-casing and casing-formation to achieve multiple objectives including zonal isolation, corrosion resistance, isolation water bearing formations, etc. Cement are tailored in the laboratory environment simulating downhole conditions required placement times (i.e. thickening time) for slurry remain a liquid state during pumping. This study presents an artificial intelligence model developed predict time based on...

Abstract Cementing operations consists of placing cement slurries between casing-casing and casing-formation to achieve multiple objectives including zonal isolation, corrosion resistance, isolation water bearing formations, etc. Cement are tailored in the laboratory environment simulating downhole conditions required placement times (i.e. thickening time) for slurry remain a liquid state during pumping. This study presents an artificial intelligence model developed predict time based on...

Abstract The rapid increase in oil and gas shale exploration has shifted industry dynamics by generating substantial unconventional resources. Advances horizontal drilling hydraulic fracturing have played important roles enabling developments. However, high-pressure cycles from stimulation operations can result cement failure, which compromises well integrity because acts as the annular barricade, protecting supporting casing while preventing unwanted fluid communication. To address...

Abstract During oilwell cementing operations, many situations occur for which it is crucial to regulate the temperature of cement slurry during and after its placement. Limiting increase cement-based composite materials has been traditionally achieved by reducing heat hydration (e.g., through use supplementary cementitious or inert filling materials). However, total amount generated a primarily determined extent cement, strong correlation with composite's strength development. Reducing...

Abstract The current approach to designing a lost circulation treatment for drilling or cementing applications is primarily based on workflows designed by project teams using experience and knowledge from historical wells. However, the effectiveness of this depends targeting operations with well conditions similar jobs collective team. Consequently, there less flexibility apply these globally job different fluids placement strategies and/or fluid treatments. In addition, dynamics wellbore...