Enhanced Cement Composition for Preventing Annular Gas Migration

2019 ◽  
Author(s):  
George Kwatia ◽  
Mustafa Al Ramadan ◽  
Saeed Salehi ◽  
Catalin Teodoriu
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Oil Well ◽  
Gas Migration ◽  
Cement Slurry ◽  
Gas Industry ◽  
Well Integrity ◽  
Transit Times ◽  
Well Cement ◽  
Gas Tight

Abstract Cementing operations in deepwater exhibit many challenges worldwide due to shallow flows. Cement sheath integrity and durability play key roles in the oil and gas industry, particularly during drilling and completion stages. Cement sealability serves in maintaining the well integrity by preventing fluid migration to surface and adjacent formations. Failure of cement to seal the annulus can lead to serious dilemmas that may result in loss of well integrity. Gas migration through cemented annulus has been a major issue in the oil and gas industry for decades. Anti-gas migration additives are usually mixed with the cement slurry to combat and prevent gas migration. In fact, these additives enhance and improve the cement sealability, bonding, and serve in preventing microannuli evolution. Cement sealability can be assessed and evaluated by their ability to seal and prevent any leakage through and around the cemented annulus. Few laboratory studies have been conducted to evaluate the sealability of oil well cement. In this study, a setup was built to simulate the gas migration through and around the cement. A series of experiments were conducted on these setups to examine the cement sealability of neat Class H cement and also to evaluate the effect of anti-gas migration additives on the cement sealability. Different additives were used in this setup such as microsilica, fly ash, nanomaterials and latex. Experiments conducted in this work revealed that the cement (without anti-gas migration additive) lack the ability to seal the annulus. Cement slurries prepared with latex improved the cement sealability and mitigated gas migration for a longer time compared to the other slurries. The cement slurry formulated with a commercial additive completely prevented gas migration and proved to be a gas tight. Also, it was found that slurries with short gas transit times have a decent potential to mitigate gas migration, and this depends on the additives used to prepare the cement slurry.

Intelligent Pipe, A New Monitoring Solution For Your Wells

2021 ◽  
Author(s):  
Francois-Xavier Bulard ◽  
Emmanuel Tavernier ◽  
Antoine Deroubaix ◽  
Umberto Caruso
Keyword(s):  
Oil And Gas ◽  
Microelectromechanical Systems ◽  
Safety Margin ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
New Era ◽  
Well Integrity ◽  
Different Depths ◽  
Intelligent Technology ◽  
Well Data

Abstract Well integrity to prevent catastrophic damage has always been a key focus of the Oil and Gas industry and Oil and Gas operators keep working to reinforce it. Today, well integrity data available throughout the life of the well remains limited. Being able to know the wellbore parameters at different depths would help operators anticipate and identify problems throughout the life of their well. In addition, knowing the exact performances of each pipe will provide operators with the actual safety margin they have against well load cases, therefore allowing them to better monitor the well, based on real well data. The integration of a pressure and temperature sensor element in tubulars is possible thanks to the use of MEMS (Microelectromechanical systems) technology. Low-power consumption combined with an adapted transmission technology opens the door to the use of this intelligent technology inside an O&G well. Embedded sensors allow operators to access previously inaccessible well areas in real time. The qualification of this technology is carried out in a way as to ensure the integrity of the system and its long-term viability. This paper will present an innovative intelligent tube solution, from its qualification to its deployment. This solution will change the way wells are monitored. By combining the data retrieved by the sensors with the actual resistance of each pipe in the well, operators will be able to adjust their production parameters while ensuring the safety of their installation. This approach is new and, leveraging the latest IoT technologies, opens a new era for easier and optimized data-based Oil and Gas well monitoring.

Synthesis and performance of a self crosslinkable acrylate copolymer with high compatibility for an oil well cement modifier

2014 ◽  
Vol 34 (5) ◽  
pp. 405-413
Author(s):  
Xianru He ◽  
Qian Chen ◽  
Chunhui Feng ◽  
Liang Wang ◽  
Hailong Hou
Keyword(s):  
High Performance ◽  
Oil And Gas ◽  
High Strength ◽  
Ammonium Persulfate ◽  
Fluid Loss ◽  
Oil Well ◽  
Cement Slurry ◽  
Oil Well Cement ◽  
Well Cement ◽  
Loss Control

Abstract High performance cement slurry polymer modifiers are increasingly in demand in the cementing process of oil and gas. A new polymer modifier with outstanding fluid loss control and high strength and toughness was synthesized by the main monomers butyl acrylate (BA), methyl methacrylate (MMA), acrylamide (AM), the functional monomers vinyltriethoxysilane (VTS), glycidyl methacrylate (GMA) and the initiator of ammonium persulfate (APS) through emulsion polymerization. By using Fourier transform infrared (FTIR) spectrometer, a laser particle analyzer, a scanning electron microscope and a differential scanning calorimeter, we studied the mechanism of fluid loss control and microstructure of polymer latex cement slurries. The experimental results showed that the copolymer could be crosslinked at 160°C and have the lowest fluid loss control, 12 ml, when the polymer content reached 5%. Acrylate latex modified by the silane coupling agent VTS had excellent performance on fluid loss control, as well as mechanical properties for oil well cement. These results have a potential significant value for the development of a new polymer cement modifier with high thermal stability and durability.

Gas Migration Prevention Using Hydroxypropylmethylcellulose as a Multifunctional Additive in Oil Well Cement Slurry

2013 ◽  
Author(s):  
Ghulam Abbas ◽  
Sonny Irawan ◽  
Sandeep Kumar ◽  
Muhammad Nisar Khan ◽  
Shuaib Memon
Keyword(s):  
Oil Well ◽  
Gas Migration ◽  
Cement Slurry ◽  
Multifunctional Additive ◽  
Oil Well Cement ◽  
Well Cement

scholarly journals Improving the Iraqi Oil Well Cement Properties Using Barolift: an Experimental Investigation

2021 ◽  
pp. 147-156
Author(s):  
Ali M. Hadi ◽  
Ayad A. Al-Haleem
Keyword(s):  
Compressive Strength ◽  
Oil And Gas ◽  
Free Water ◽  
American Petroleum Institute ◽  
Oil Well ◽  
Cement Slurry ◽  
X Ray ◽  
Gas Drilling ◽  
Drilling Operations ◽  
Well Cement

Cement is a major component in oil and gas drilling operations that is used to maintain the integrity of boreholes by preventing the movement of formation fluids through the annular space and outside the casing. In 2019, Iraq National Oil Company ordered all international oil and gas companies which are working in Iraq to use Iraqi cement (made in Iraq) in all Iraqi oil fields; however, the X-ray fluorescence (XRF) and compressive strength results in this study show that this cement is not matching with American Petroleum Institute (API) standards. During this study, barolift was used to improve the properties of Iraqi cement used in oil wells at high pressure and high temperature (HPHT). Barolift (1 g) was added to cement admixture to evaluate its influence on improving the performance of cement, mainly related to the property of toughness.  Primarily, the quality and quantity of cement contents were determined using X-ray fluorescence. Experiments were conducted to examine the characteristics of the base cement and the cement system containing 1g of barolift, such as thickening time, free water, compressive strength, and porosity. X-ray diffraction (XRD), scanning electron microscope (SEM), and energy dispersive X-ray spectroscopy (EDS) were conducted for analyzing the microstructure of cement powder. The experimental results showed that barolift acted as a retarder and improved the thickening time, slightly increased the free water, enhanced the mechanical properties, reduced the porosity, and aided in scheming new cement slurry to withstand the HPHT conditions. Microstructure analysis showed that barolift particles blocked the capillaries by filling cement spaces and, thus, a denser and stricter cement network was achieved.

scholarly journals Evolution of hydraulic fracturing fluid: from guar systems to synthetic gelling polymers

2021 ◽  
pp. 172-181
Author(s):  
A. P. Stabinskas ◽  
◽  
Sh. Kh. Sultanov ◽  
V. Sh. Mukhametshin ◽  
L. S. Kuleshova ◽  
...  
Keyword(s):  
Hydraulic Fracturing ◽  
Industrial Development ◽  
Oil And Gas ◽  
Scale Up ◽  
Oil And Gas Industry ◽  
Chemical Components ◽  
Subsequent Stage ◽  
Oil Well ◽  
Gas Industry ◽  
Operational Activities

The paper presents the possibilities of optimizing technological approaches for performing hydraulic fracturing operations, taking into account the transition from traditionally used chemical components of the process fluid to synthetic gelling polymers. The proposed option makes it possible to reduce the unit costs of operational activities to increase oil production both for new assets of oil and gas producing companies and for assets at the stage of industrial development. The special emphasis of the proposed technological solutions is correlated with the environmental Agenda for Sustainable Development until 2030, aimed at transforming the production processes of the energy complex to reduce the ecological footprint of enterprises. A complete set of laboratory studies confirms the prospect of industrial application of synthetic polymer systems and the feasibility of replicating this approach. The subsequent stage of scale-up of pilot tests will allow to have a basis for development and implementation of standards in the oil and gas industry. Keywords: oil; well; hydraulic fracturing; chemicals; synthetic gelling polymers.

scholarly journals Synergistic Effect of Latex Powder and Rubber on the Properties of Oil Well Cement-Based Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Jianjian Song ◽  
Mingbiao Xu ◽  
Weihong Liu ◽  
Xiaoliang Wang ◽  
Yumeng Wu
Keyword(s):  
Synergistic Effect ◽  
External Load ◽  
Oil And Gas ◽  
Fluid Loss ◽  
Cement Stone ◽  
Oil Well ◽  
Cement Slurry ◽  
Sem Images ◽  
Oil Well Cement ◽  
Well Cement

The brittleness and the poor resistance to external load of oil well cement impede the development of oil and gas wells. To overcome these deficiencies, latex powder or rubber and their hybrid combinations were used to modify the oil well cement. The conventional properties, mechanical properties, and scanning electron microscopy (SEM) images of the modified cement were analyzed. In comparison with latex powder-incorporated cement and rubber-incorporated cement, a significant improvement of fluid loss, flexural strength, impact strength, and elasticity of the cement slurry was observed when using the hybrid combinations of 3 wt.% latex powder and 2 wt.% rubber, although this synergistic effect was not remarkable on the compressive strength and the thickening time. These evidences arose from the synergism between latex powder and rubber leading to the formation of a three-dimensional network structure and a flexible structure which subsequently improved the elasticity and toughness of cement stone. The improved elastic matrix has a buffering effect on external impact when the cement stone is subjected to an external load.

scholarly journals Reduction of fluid migration in well cement slurry using nanoparticles

2020 ◽  
Vol 75 ◽  
pp. 67
Author(s):  
Mahmoud Bayanak ◽  
Soroush Zarinabadi ◽  
Khalil Shahbazi ◽  
Alireza Azimi
Keyword(s):  
Fluid Migration ◽  
Oil Well ◽  
Gas Migration ◽  
Test Results ◽  
Cement Slurry ◽  
Negative Effects ◽  
Transient Time ◽  
Well Completion ◽  
Nanosilica Particles ◽  
Well Cement

One of the main problems during oil well completion and cementing operation is fluid migration through cement bulk or behind the cemented casing. Slurry composition and characteristic have been focused and improved in last decades to mitigate gas migration and, recently, aspects such as using nanotechnology have been investigated to amend the conditions. In this research, two moderate base slurries with 95 and 120 Pound per Cubic Feet (PCF) densities containing different percentages of nanosilica have been examined using a perfect test package. The results of Fluid Migration Analyzer (FMA) demonstrated that using correct percentage of nanosilica particles modified rheological behavior of the slurries and decreased fluid migration volume. Moreover, adding nanoparticles did not have any negative effects on any conventional parameters. However, static gel strength analyzer showed significant transient time reduction which is an important key in cement setting profile. Triaxial test results together with Mohr circles analyzing presented considerable progress in cement stability and compressive strength.

Optimization of the Cement Slurry Compositions With Addition of Zeolite for Cementing Carbon Dioxide Injection Wells

2015 ◽  
Author(s):  
Krunoslav Sedić ◽  
Nediljka Gaurina-Medjimurec ◽  
Borivoje Pašić
Keyword(s):  
Carbon Dioxide ◽  
Oil And Gas ◽  
Co2 Injection ◽  
Carbon Dioxide Injection ◽  
Cement Slurry ◽  
Gas Reservoirs ◽  
Injection Wells ◽  
Standard Size ◽  
Well Integrity ◽  
Well Cement

Well integrity related to carbon dioxide injection into depleted oil and gas reservoirs can be compromised by corrosion which can affect casing, downhole and surface equipment and well cement. Impact on well cement can cause overall degradation of set cement and lead to migration of carbon dioxide back to the surface. Thus, special types of cements should be used. One of the acceptable solutions is application of cement blends based on a mixture of Portland cement and pozzolans. The present paper deals with optimization of the cement slurry design containing zeolite which is nowadays widely used due to its high pozzolan activity potential. Cement blends containing 20%, 30% and 40% zeolite clinoptilolite were used. Cement slurries were optimized for application in slim hole conditions on CO2 injection wells on Žutica and Ivanić oil fields in Croatia (Europe), where an old and deteriorated production casing was re-lined with new smaller sized one. Results obtained by this study suggest that cement slurry containing zeolite can be optimized for application in well conditions related to CO2 injection and underground storage, ranging from a slim hole to standard size casing cement jobs which leads to an improvement of well integrity related to CO2 injection.

Smart Expandable Cement Additive to Achieve Better Wellbore Integrity

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
A. Dahi Taleghani ◽  
G. Li ◽  
M. Moayeri
Keyword(s):  
Mechanical Properties ◽  
Oil And Gas ◽  
Setting Time ◽  
Oil And Gas Industry ◽  
Test Methods ◽  
Standard Test ◽  
Cement Slurry ◽  
Gas Industry ◽  
Additive Particles ◽  
Cement Additive

One of the serious challenges encountered in cementing oil and gas wells is the failure of the cement sheaths and its debonding from casing or formation rock. Shrinkage of the cement during setting is identified as one of the driving factors behind these issues. Some expansive cement systems have been developed in the oil and gas industry to compensate for the shrinkage effect. All the expansive additives which have been developed so far have chemical reactions with the cement itself that would significantly impact the mechanical strength of the cement. In this paper, we present a new class of polymer-based expandable cement additive particles which are made of shape memory polymers (SMP). This class of polymers is designed to expand to the required extent when exposed to temperatures above 50–100 °C (122–212 °F) which is below the temperature of the cementing zone. It is notable that expansion occurs after placement of the cement but before its setting. The API RP 10 B-2 and 5 have been followed as standard test methods to evaluate expansion and strength of the cement slurry after utilizing the new additive. The proposed additive does not react with the water or cement content of the slurry. Mechanical evaluation tests confirm the potential benefit of this additive without any deteriorative effect on mechanical properties or setting time of the cement paste and significant impact on its mechanical properties. Hence, this additive would provide a reliable way to prevent cement channeling, debonding, and fluid migration to upper formations.

Experimental Investigations on the Effect of Mixing Procedures on the Rheological Properties of Oilwell Cement Slurries

2021 ◽  
pp. 1-12
Author(s):  
Fatemeh K. Saleh ◽  
Catalin Teodoriu
Keyword(s):  
Rheological Properties ◽  
Oil And Gas ◽  
Mixing Time ◽  
Oil And Gas Industry ◽  
Experimental Investigations ◽  
Mixing Conditions ◽  
Cement Slurry ◽  
Gas Industry ◽  
Mixing Energy ◽  
Pseudoplastic Fluids

Abstract Well cementing is an essential operation in the oil and gas industry, and it is a key material to ensure wellbore integrity through the life of the well. Improper cement design can trigger well construction risks such as de-bonding and leakage pathways near-wellbore and through the annulus. Mixing non-newtonian fluids is one of the most challenging tasks, especially for pseudoplastic fluids exhibiting yield stress, such as wellbore cement slurry. Mixing conditions for cement slurries and their effect on rheological properties and thickening time has been debated through the literature. In this study, based on laboratory-scale experiments, we provide testing results for rheological properties and thickening time by changing mixing conditions. Our results show that slurries mixed under similar mixing energy do not necessarily result in similar rheological properties. Comparing rheological measurements from lower mixing energy to higher mixing energy, plastic viscosity decreases; however, yield point increases. This implies the dual opposite effect of mixing time on rheological properties. This may have severe implications for field operations where mixing must be improved to enable successful cement operation.

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