A two-phase near-wellbore simulator to model non-aqueous scale inhibitor squeeze treatments

Vazquez, Oscar; Mackay, Eric James; Sorbie, Kenneth Stuart

doi:10.1016/j.petrol.2011.12.030

Cited by 27 publications

(14 citation statements)

References 17 publications

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“…As the conventional techniques met challenges for effectiveness, many studies were conducted for more advanced techniques (James et al 2005;Jordan et al 1995;Khormali et al 2017;Sutherland and Jordan 2016;Vazquez et al 2012). Thus, better regarded treatment methods that do not suffer from the disadvantages that beset conventional techniques were suggested.…”

Section: Advancements On Scale Inhibitor Treatmentsmentioning

confidence: 99%

State of the art of synthetic threshold scale inhibitors for mineral scaling in the petroleum industry: a review

Mpelwa

Tang

2019

Pet. Sci.

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Inorganic scale deposits are a major water-related problem encountered in producing oil and gas wells. The harshness of scale deposits is dependent on the field operating conditions. Scale deposits can vary from mild scaling tendencies to extreme. In general, the scale deposit will cause a reduction in formation pores, declining productivity and eventually blockage of the wellbore and hence unexpected downtime if it is allowed to persevere. To overcome this, the productivity of an oil and gas well is ensured by handling scale deposits via removal or prevention methods. Scale prevention is the best and cost-effective method for handling scale deposits that ensures production continuity. Inhibition through "threshold" scale inhibitor treatment is the most common method that is proven to prevent or reduce likely deposits. This paper examines the art of synthetic scale inhibitors, in particular, threshold scale inhibitors in oil and gas production. It discusses the chemistry of those inhibitors, inhibition mechanisms, treatment methods and key properties for their applications. It also highlights the chemistry of the synthetic routes often used to produce them in the laboratory and/or industry. Finally, it highlights the environmental concerns for the applicability of threshold scale inhibitors.

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Section: Advancements On Scale Inhibitor Treatmentsmentioning

confidence: 99%

State of the art of synthetic threshold scale inhibitors for mineral scaling in the petroleum industry: a review

Mpelwa

Tang

2019

Pet. Sci.

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“…Squeezing is a well-established procedure in onshore and offshore oil production facilities (King et al, 1991;Mackay et al, 1998;Meters et al, 1985;Poynton et al, 2004;Bourne et al, 2000;Lopez et al, 2005;Vazquez et al, 2009Vazquez et al, , 2011Vazquez et al, , 2012. It comprises the injection of SI, normally as an aqueous solution, usually preceded by a smaller preflush, and followed by a larger overflush stage; finally, there will often be a shut-in stage, usually lasting from 6 to 24 hours.…”

Section: Scale Overviewmentioning

confidence: 99%

“…The model simulates chemical transport and simultaneous oil and water flow in the wellbore area. The model considers one dimensional two-phase flow transport in radial coordinates (Vazquez et al, 2012). The model has been extensively used to simulate squeeze treatments in the field (Bogaert et al, 2007;Vazquez et al, 2011;Mackay and Jordan, 2003;Patterson et al, 2013;Jordan, 2013).…”

Section: Specialized Near Wellbore Characterizationmentioning

confidence: 99%

Scale Inhibitor Squeeze Treatment Design in an Acid Stimulated Carbonate Reservoir

Vazquez¹,

Mackay²,

Jordan

2015

All Days

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The aim of this paper is to describe a methodology to simulate scale squeeze treatments in acid stimulated carbonate reservoir. Acid stimulation treatments refer to matrix acidizing, which aims to improve productivity in tight carbonate reservoirs. They generally show a high porosity, but very low permeability. Matrix acidizing treatments have been applied successfully in numerous occasions, they consist of the injection of an acid, generally, hydrochloric acid, mainly because of the high reactivity with carbonate formations. When the acid is injected into the formation, a number of wormholes or highly conductive channels are formed, which are the result of two very distinctive, but interconnected processes. On the one hand, there are chemical reactions between the carbonate minerals and the acid and on the other hand, there are the fluid dynamics of the injected acid, i.e. the fluid loss from wormhole to formation and the fluid distribution in possibly highly complex wormhole geometries. There have been numerous studies investigating the geometry of the wormhole growth pattern in radial and linear laboratory experiments, as well as stochastic simulation. They concluded that wormholes grow in a certain pattern in both axial and angular directions. Although the exact wormhole pattern will strongly depend on the permeability anisotropy and heterogeneity, it is reasonable to assume that the dominant wormholes are expected to grow symmetrically, and that the region dominated by each wormhole is approximately 90°around the wellbore.To simulate squeeze treatments in an acid stimulated well with a corresponding wormhole pattern, as described above, a reservoir simulator is used. The reservoir simulator describes the pressure field and consequently the propagation of scale inhibitor (SI) along the wormholes, but also into the matrix. The final step is to determine how deep the SI propagates into the matrix, which was used to determine fully a specialized near wellbore model for scale treatment design.

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“…Once the well starts production, the inhibitor will gradually desorb, release, and flow back with the production water. If the inhibitor return concentration is higher than the required minimum inhibitor concentration (MIC), the scale formation will be inhibited (Vazquez et al, 2012). Therefore, one significant objective in squeeze research is to extend the squeeze lifetime, i.e., to maintain the return concentration above MIC as long as possible.…”

Section: Introductionmentioning

confidence: 99%

High Return Performance of Calcium Phosphonate (Ca-DTPMP) Colloidal Inhibitors for Squeeze Treatment in Shale Formations

et al. 2020

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The objective of this work was to develop nanomaterial inhibitor with long squeeze life for oil and gas production. Different surfactants, such as trisodium citrate (Na 3 Cit), cetyltrimethyl ammonium bromide, benzethonium chloride (Hyamine), and bipyridinium dibromide (Gemini), were added to synthesize nanoparticle Ca-DTPMP inhibitor at pH 9.0. The inhibitors were characterized by scanning electron microscope and dynamic light scattering. All these surfactants significantly decreased the particle size, but Gemini was the most effective one to control the calcium phosphonate salt particle size to be about 500 nm. Long-term squeeze experiments (∼3000 PV) saturated with calcite at 70 • C and 75 psi back pressure through a glass column packed with Fayetteville shale rock show that the return DTPMP concentration was as high as 3 ppm for the Gemini-Ca-DTPMP colloidal inhibitor. This is an unprecedented improvement in comparison with the squeeze return of DTPMP only inhibitor where the inhibitor return concentration dropped to below 1 ppm within 400 pore volumes. The Ca-DTPMP speciation, potential field application, and the SqueezeSoftPitzer model prediction are also discussed.

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A two-phase near-wellbore simulator to model non-aqueous scale inhibitor squeeze treatments

Cited by 27 publications

References 17 publications

State of the art of synthetic threshold scale inhibitors for mineral scaling in the petroleum industry: a review

State of the art of synthetic threshold scale inhibitors for mineral scaling in the petroleum industry: a review

Scale Inhibitor Squeeze Treatment Design in an Acid Stimulated Carbonate Reservoir

High Return Performance of Calcium Phosphonate (Ca-DTPMP) Colloidal Inhibitors for Squeeze Treatment in Shale Formations

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