Effect of Chemical EOR on Class G Oilwell Cement Integrity under Elevated Conditions

Alias, Nur Syahirah; Ridha, Syahrir; Yerikania, Utami

doi:10.1016/j.proeng.2016.06.593

Cited by 3 publications

(2 citation statements)

References 4 publications

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“…Comprehensive investigation the effect of CO 2 on well cement may assist in understanding the behavior of such reaction between acid gas and cement system. This information was very important for the application of enhanced oil recovery (EOR) and enhanced coalbed methane (ECBM) recovery [2,3].…”

Section: Introductionmentioning

confidence: 99%

The influence of CO₂ accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure

Ridha

Setiawan

Hamid

et al. 2018

Materialwissenschaft Werkst

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An alternative of wellbore cement system, formed through alkali-activation of fly ashes also knows as fly ash geopolymers, provides attractive properties due to its high compressive strength and durability against acidic conditions. However, changes in microstructure and mineralogical during accelerated carbonation affected by CO 2 alteration under elevated temperature and pressure have not been fully understood. This paper investigates and characterizes the alkali-activated binders fly ash based in the acidic environment under elevated temperature and pressure. The results found that scales such a layer was formed in the gel phase at the spherical surface of fly ash after carbonation process. The effect is that the surface of the gel phase became rough and porous. Carbonate and/or bicarbonate salts were identified as major phase in the sample after immersion test. In the activated fly ash cement, both calcium aluminate silicate hydrate (C-A-S-H) and sodium aluminosilicate hydrate (N-A-S-H) gels were formed; C-A-S-H gel was decalcified, forming calcium carbonate phase in the form of calcite, aragonite or vaterite. These findings were confirmed by the analysis and identification of Fourier-transformed infrared spectroscopy, X-ray diffraction and scanning electron microscopy tests on the changes in the cement system.

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Section: Introductionmentioning

confidence: 99%

The influence of CO₂ accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure

Ridha

Setiawan

Hamid

et al. 2018

Materialwissenschaft Werkst

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“…The main purpose of cementing is to hydraulically isolate producing zones and non-producing zones; effectively preventing fluid movement between formations; bond and support the casing string that has been installed prior to cementing the casing; protects casing from shock loads in drilling operations and effectively sealing off loss circulation or thief zones [1][2][3]. It offers protection to the casing by minimizing casing corrosion and preventing the casing from collapsing.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Mixed Oil-Cement for Wellbore Integrity Using Acoustic Velocity

Ridha

Lubis

Setiawan

et al. 2017

KEM

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Oilwell cementing is part of completing a well prior to production. As a casing is installed after a section of the well is drilled, cement is pumped downhole. Reservoir fluid such as oil which may encroach into the wellbore due to naturally fractured or unconsolidated formation would mix with the cement pumped downhole. Recent studies have shown that the presence of oil affect cement quality to an extent where the cement compressive strength is greatly reduced. Early detection of possible oil contamination into cement may prevent well integrity problem. With intense application of acoustic principle into wellbore, however, not many references available to detect the presence of oil in cement system using this principle. This study investigates whether acoustic waves can detect oil in cement. Class G cement is mixed with both water and brine where crude oil is then added to the mixture. The resulting slurry were cured using High Pressure High Temperature (HPHT) curing chamber at 120°C and 4,000 psi for 24 hours and is then cored into 1-inch cylinder. SonicViewer-SX is used to propagate acoustic waves through the core sample where the transit time is recorded and analyzed. It is found that oil can be detected in cement using acoustic waves since oil-filled samples have slower P-waves and S-waves velocities than cement-filled samples. The case is also proven when water is replaced by brine as the mixing fluid which oil-filled samples have lower P-waves and S-waves velocities to that of cement-filled samples.

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Performance Assessment and Economic Analysis of Blended Class G Cement With Local Cement for Oil Well Cementing Operations: A Case Study of Ghana

Amorin

Broni-Bediako

Westkinn

et al. 2019

Day 3 Wed, August 07, 2019

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Good cementing job practices are required for an efficient advancement in drilling and production operations. Most drilled oil and gas wells in Ghana employ the use of class G cement in its cementing operations. This class G cement is imported, scarcely available and relatively more expensive compared to other forms of cements. It also does not promote the local content and local participation policy of the country in the oil and gas sector. This has therefore necessitated the need to research into available local cements (easily available and relatively inexpensive) as an alternative to serve the same purpose as the imported class G cement. This research therefore assesses the performance of class G cement blended with local cement at different ratios in an attempt to reducing the overdependence of the class G cement while considering the technical requirements and economic implications. All the blended samples met the minimum API compressive strength requirement of 1500 psi when cured for 8 hours at 140 °F. Though, free fluid values increased with increasing amount of local cement ratio, all values recorded were below the maximum field requirement value of 5.9%. The blended samples exhibited the ability to be pumpable, recording plastic viscosity less than the maximum recommended value of 100 centipoise (cP). It was therefore established that the use of blended samples (local and Class G) for oil well cementing operations in Ghana would save the industry from 19.57% to 78.28% of money over the use of class G cement only. Considering the performance and economic benefits of the blended cement over the class G cement only at the test conditions, it is highly recommended that, the industry adopts the blending of class G cement with the local cement in their cementing operations to boost the local economy as well as to reducing their cementing operation cost.

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Effect of Chemical EOR on Class G Oilwell Cement Integrity under Elevated Conditions

Cited by 3 publications

References 4 publications

The influence of CO₂ accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure

The influence of CO₂ accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure

Investigation on Mixed Oil-Cement for Wellbore Integrity Using Acoustic Velocity

Performance Assessment and Economic Analysis of Blended Class G Cement With Local Cement for Oil Well Cementing Operations: A Case Study of Ghana

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Effect of Chemical EOR on Class G Oilwell Cement Integrity under Elevated Conditions

Cited by 3 publications

References 4 publications

The influence of CO2 accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure

The influence of CO2 accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure

Investigation on Mixed Oil-Cement for Wellbore Integrity Using Acoustic Velocity

Performance Assessment and Economic Analysis of Blended Class G Cement With Local Cement for Oil Well Cementing Operations: A Case Study of Ghana

Contact Info

Product

Resources

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The influence of CO₂ accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure

The influence of CO₂ accelerated carbonation on alkali‐activated fly ash cement under elevated temperature and pressure