Mechanical Alteration of Near-Wellbore Mineralogy for Improved Squeeze Performance

Fleming, Niall; Ramstad, Kari; Hoeth, Laurien Wichers; Kidd, Sam

doi:10.2118/130147-pa

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…However, effects of ethanol, DMF and DCC can be easily neglected due to washing process at different stages in the NAST coreflood experiments. The only remaining chemical that could affect the results was aminosilane of which the influence was previously studied [10,11].However these studies cannot be compared due to different experimental conditions. This is the subject of future work to investigate the effect on aminosilane on NAST coreflood results.…”

Section: Coreflood Resultsmentioning

confidence: 99%

“…One organosilane was utilised in the oil field in order to increase the adsorption of SI as a fixing agent [10,11]. In this work the key point is to pre-treat the rock surface to have a covalent bond with CNTs.…”

Section: Making Quartz Reactive With Npsmentioning

confidence: 99%

“…3-aminopropyltriethoxysilane is one of the common silanes that has the potential to be used in NAST. Also, 3-aminopropyltriethoxysilane has been used to bond to kaolinite and to increase adsorption of SI [10,11].…”

Section: Nast1mentioning

confidence: 99%

“…Recently, attempts to improve squeeze treatments and increase squeeze lifetime have been made by a number of means including using crosslinking the inhibitors [2], increasing the pH of the aqueous solution by adding additives [3,4], employing inhibitor particles [5], boosting precipitation and adsorption by additives [6,7], using calcium in precipitation squeeze treatment [8,9] and more recent new ideas such as using fixing agents [10], altering the rock mineralogy [11] and employing nano-particles for further displacement [1].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Ghorbani¹,

Wilson²,

Kapur³

et al. 2014

SPE International Oilfield Scale Conference and Exhibition

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A new potential application of nanotechnology for mineral scale prevention in the oil and gas industry is presented. In current squeeze treatments, in which scale inhibitors are squeezed into wells to adsorb or precipitate onto rock surfaces for later release, a large proportion of the injected inhibitor does not adsorb and is therefore returned very quickly from the reservoir upon well re-start. Here it is demonstrated that nano-particles have the potential to enhance squeeze lifetime by greatly increasing the adsorption of inhibitors within the formation. An extensive literature review is presented, exploring the potential for using nano-scale materials in squeeze treatments. One of the observations from scale inhibitor squeezes into sandstone reservoirs is the apparent lack of suitable surfaces available for adsorption. The main constituent of sandstones, quartz, has a very low ability to adsorb inhibitor (1 mg/I). Given this, research using nanotechnology was targeted towards enhancing the available sites for scale inhibitor adsorption within the near wellbore. Specifically, research was undertaken to examine the potential benefits of using carbon nanotubes in a process called Nanotechnology Assisted Squeeze Treatment (NAST). The process involves carbon nanotubes adsorbing and permanently modifying the near wellbore with scale inhibitors subsequently adsorbing onto the nanotubes. This process was observed to be significantly higher than a non-modified near wellbore surface, with a maximum adsorption of more than 85 and 160mg/g onto the nanotubes in solution of distilled water (DW) and CaC12 in DW; respectively, compared to 1 mg/g directly onto the rock. Coreflood tests comparing the NAST procedure with a simplified standard coreflood show the potential for improvement of the squeeze lifetime. IntroductionInorganic scale precipitation, including formation of CaCO 3 , MgCO 3 , FeCO 3 , BaSO 4 , CaSO 4 , SrSO 4 , etc. occurs when two incompatible brines are mixed or where the conditions (i.e. temperature and pressure) in a system are changed and there is a resulting change in the solubility of certain salts. This can cause blockage of the oil path and damage to the production system. A chemical squeeze treatment is used to pump scale inhibitor (SI) downhole to adsorb or precipitate onto the formation rock. The aim is to establish a downhole reserve of SI from which subsequent desorption or release maintains a concentration of SI within the reservoir sufficient to prevent scale formation. The lifetime of the squeeze treatment is defined as the time when the return Scale Inhibitor (SI) concentration falls below the Minimum Inhibitor Concentration (MIC), which is typically 1-20 ppm depending on the reservoir conditions and SI properties. At this point the well needs to be re-squeezed. Regardless of whether the SI adsorbs or precipitates, the squeeze treatment process is expensive due to the squeeze implementation, chemical inhibitor costs and most importantly because of production losses/deferred during th...

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Section: Coreflood Resultsmentioning

confidence: 99%

Section: Making Quartz Reactive With Npsmentioning

confidence: 99%

Section: Nast1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Ghorbani¹,

Wilson²,

Kapur³

et al. 2014

SPE International Oilfield Scale Conference and Exhibition

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show abstract

Inorganic mineral scale mitigation

Graham¹,

Frigo²

2022

Flow Assurance

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Modeling the Application of Scale-Inhibitor-Squeeze-Retention-Enhancing Additives

Vazquez¹,

Thanasutives

Eliasson

et al. 2011

SPE Production &Amp; Operations

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Summary The most common method for preventing scale formation is by applying a scale-inhibitor (SI) squeeze treatment. In this process, an SI solution is injected down a producer well into the near-wellbore formation. In the last few years, several publications have presented experimental results, field data, and treatment methods showing enhanced squeeze lifetime because of the use of squeeze enhancers. The main purpose of this paper is to model the effect of SI-retention-enhancing additives. These additives are normally deployed in reservoirs where the SI shows poor retention in the formation matrix in order to reduce well interventions. In the last few years, a number of techniques to enhance the SI retention have been reported in the literature, such as precipitation squeezes using calcium and/or pH-increasing additives, use of an additive package that enhances SI adsorption by crosslinking, and the injection of nondamaging concentrations of kaolinite, calcium carbonate, and organosilane (a solids-fixation agent). The effect of the SI-retention enhancer is modeled as a function of the adsorption level of the additive. A sensitivity study is then presented on the effect of deploying the additive in the different stages; normally, they are deployed in the preflush stage. However, the aim of this paper is to investigate how the treatment could be optimized to achieve the longest squeeze lifetime with a fixed amount of additive. An example of modeling a specific field treatment injecting organosi-lane is included. The results are compared with the field return profiles and clearly demonstrate the value such modeling can bring to the interpretation and design of field squeezes.

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Mechanical Alteration of Near-Wellbore Mineralogy for Improved Squeeze Performance

Cited by 5 publications

References 8 publications

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Carbon Nanotubes: A New Methodology for Enhanced Squeeze Lifetime CNTs

Inorganic mineral scale mitigation

Modeling the Application of Scale-Inhibitor-Squeeze-Retention-Enhancing Additives

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