Successful History of Cementing and Zonal Isolation in Thailand's High Temperature Offshore Wells

Brandl, Andreas; Valentino, Vincentius; Fauchille, Guillaume; Thein, Aung Min; Stanley, Rick; Rivera, Nemesio Navarro; Siritheerasas, Khamawat

doi:10.2118/172125-ms

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Too much fluid loss/ filtrate means the cement slurry undergoing dehydration which will cause a series of quality issues of cement sheath (micro-annuli, bonding issue, etc.,). Some researchers pointed out that the incorporation of magnesia particles into Portland cement will increase the slurry's fluid loss quantity (Brandl et al, 2014). Other studies also used such a testing method to evaluate the possible impact of magnesia introduction into Portland cement (Ghofrani and Plack, 1993;Hammad and Altameini, 2002).…”

Section: Fluid Lossmentioning

confidence: 99%

“…One possible reason can be attributed to the pore solution chemical conditions such as pH value variation, different ionic components (silicate ions, aluminate ions). Some other researchers, (Brandl et al, 2014), gave another version of magnesia's impact on PC hydration. They commented on two side-effects of magnesia on PC hydration: 1) acceleration of PC hydration and setting; 2) increment of fluid loss of cement slurry.…”

Section: Expansion and Hydrated Matrix Structure Alternationmentioning

confidence: 99%

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Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

et al. 2021

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The current paper presents a literature review on the studies of incorporation of magnesia (magnesium oxide) into Portland cement material from the geotechnical well construction perspective. Starting with a comparison of application conditions between civil construction and geotechnical well cementing, this work reviewed the Portland cement categorizations, magnesia manufacturing routes at first. Then, the physical-chemical-mechanical properties were investigated which includes the reactivity of magnesia, expansion influence from its hydration, and carbonation/dehydroxylation of magnesia blended Portland cement. The development of cement material hydration modeling methods is also summarized. Moreover, the experimental characterization methods have also been elucidated including composition determination, particle size analysis, volumetric variation measurement, compressive strength testing, shear-bond strength testing, transition state analysis, etc. Meanwhile, the results and conclusions were extracted from the literature. Through this route, a comprehensive understanding of the scientific research progress on magnesia blended Portland cement development for geotechnical well construction is derived. Additionally, it is concluded that incorporating magnesia into Portland cement can provide benefits for this material utilization in geotechnical well constructions provided the reasonable tuning among the characteristics of magnesia, the downhole surrounding conditions, and the formulation of the cement slurry. Satisfying these pre-conditions, the effective expansion not only mitigates the micro-annulus issues but also increases the shear bonding strength at the cementing interfaces. Moreover, the caustic magnesia introduction into Portland cement has the potential advantage on carbon dioxide geological sequestration well integrity compared with the Portland cement sheath without it because of the denser in-situ porous matrix evolvement and more stable carbon fixation features of magnesium carbonate. However, since the impact of magnesia on Portland cement strongly depended on its properties (calcination conditions, particle size, reactivity) and the aging conditions (downhole temperature, pressure, contacting medium), it should be noted that some extended research is worth conducting in the future such as the synchronized hydration between magnesia and Portland cement, the dosage limit of caustic magnesia in Portland cement in terms of CO2 sequestration and the corresponding mechanical properties analysis, and the hybrid method (caustic magnesia, Portland cement, and other supplementary cementitious materials) targeting the co-existence of the geothermal environment and the corrosive medium scenario.

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Section: Fluid Lossmentioning

confidence: 99%

Section: Expansion and Hydrated Matrix Structure Alternationmentioning

confidence: 99%

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

et al. 2021

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“…In oil and gas wells cementing, a cement slurry is injected into the annulus between the casing and a geological formation surrounding the oil and gas well to prevent the interzonal migration of fluid inside the geological formations. , Ensuring a good bond between casing and borehole wall is a key factor for any cementing operation. , Oil well cementing also serves to prevent the casing from the corrosion. During hydraulic fracturing operations in a deeper wells, cementing also withstands the shock loads. − The cement expansion and shrinking due to variation in downhole temperature and pressure conditions affect the stresses around the borehole, which ultimately causes debonding of the cement . An unsuitable cement slurry design can endanger the oil and gas well.…”

Section: Introductionmentioning

confidence: 99%

“…5−7 The cement expansion and shrinking due to variation in downhole temperature and pressure conditions affect the stresses around the borehole, which ultimately causes debonding of the cement. 8 An unsuitable cement slurry design can endanger the oil and gas well. It can result in oil spills, which can cause huge production losses and impact the marine environment due to the production of toxic materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Novel, Efficient, and Sustainable Hybrid Silicate System in Oil and Gas Well Cementing

2020

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The cement sheath between casing and formation is required to have long-term sustainability for the longer life of the well. Different formulations based on different additives are prepared and pumped down into the annulus between casing and formation. In the past, sodium silicate and some other silicates had a wide range of applications in conformance control and water shutoff. Mostly silicate-based systems were used as extenders and accelerators in oil well cementing. In this study, a novel silicate system, aqueous alkali alumino silicate (AAAS) was tested in oil well cementing. There have been limited applications of an AAAS-based cement system reported in the literature. Nondestructive compressive strength and rheological properties such as plastic viscosity, yield point, and gel strengths of silicate-based cement slurries were measured. The AAAS was added in (3, 5, and 8) wt % (% by weight of water) into the cement slurry and cured at 50 °C and 2000 psi for 24 h in an ultrasonic cement analyzer. The evolution of compressive strength was measured with time. The rheological properties were measured at 50 °C and atmospheric pressure using an atmospheric viscometer. The performance of AAAS was compared with 5 wt % sodium silicate and simple Class G cement. The scratch strength of 5 wt % AAAS and sodium-silicate-based cement slurries were tested and compared. It was observed that the addition of a novel silicate system increased the compressive strength. In addition to that, the novel silicate provided an accelerating effect in the development of compressive strength. The rheological properties increased with an increase in concentration. The yield point was mainly affected by the addition of AAAS. The application of a novel silicate could be a strong alternative for sodium silicate in area of oil well cementing because of its promising results of compressive strength and rheology. It has a high tolerance toward contamination as compared to sodium silicate reported in the literature. The nondestructive compressive was increased by 33% upon the ddition of 5 wt % AAAS. Furthermore, AAAS increased the yield point from 15.94 to 24.64 lbf/100 ft2 at 5 wt % concentration. The AAAS solution is preferable in shallow gas wells of depths less than 3000 feet and 60 °C temperature. In those wells, AAAS can be pumped along with cement slurry for its quick setting. The AAAS can also be applied as an extender during cementing of low breakdown pressure formation or depleted zones.

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Offline Cementing Technique

Urdaneta

Wiriawan²,

Barragan³

et al. 2019

SPE/IADC International Drilling Conference and Exhibition

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The expansion phase of the offshore Mafumeira major capital project in Angola commenced in 2015. Because ofthe global low-oil-price environment, the team was challenged to revise the basis of design and operational procedures to help reduce well construction time by more than 50% and accelerate the date of first oil production.A major focus of this effort was to conduct as many offline activities as possible during the well construction. Offline activities were performed before or after the jackup rig movedonto the slot, reducing the overall project cycle time. The feasibility of conducting offline cementing was evaluated and risk-assessed for several of the planned casing strings. The concept was conceived and implemented, initially for the 20-in. surface casings, for the second batch of wells in the expansion project. The ability to cement the surface casing offline allowed the rig to move to another slot and drill the next well in the batch campaign while simultaneously cementing, cutting the casing, and installing the wellhead on the previous well. Nine tophole sections have been cemented in Angola using the offline cementing technique, providing USD 4 million intotal cost savings and reducing rig time approximately 18 hours per well, which helped achieve the overall target of reducing well construction time by 50%.The cementing objectives were successfully achieved in all cases, including adequate top of cement (TOC) and formation integrity tests (FITs) upon drilling out the shoes. As part of continuous performance improvement, the opportunity to perform cementing offline in deeper hole sections of the well is being assessed.

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Successful History of Cementing and Zonal Isolation in Thailand's High Temperature Offshore Wells

Cited by 4 publications

References 7 publications

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

Recent Advances in Magnesia Blended Cement Studies for Geotechnical Well Construction—A Review

Experimental Investigation of a Novel, Efficient, and Sustainable Hybrid Silicate System in Oil and Gas Well Cementing

Offline Cementing Technique

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