Long-Term Control of Paraffin Deposition.

Woo, G.T.; Garbis, S.; Gray, TE

doi:10.2118/13126-ms

Cited by 29 publications

(15 citation statements)

References 5 publications

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“…Wax deposition in crude oil production systems can be reduced or prevented by one or a combination of the mitigation methods such as chemical, mechanical and thermal mitigation methods. 20 Wax deposition is highly impacted by temperature; therefore thermal methods can be applied to eliminate the problem. Thermal methods include heat retention, active heating and use of suitable exothermic chemical reactions.…”

Section: Methodsmentioning

confidence: 99%

Wax deposition process: mechanisms, affecting factors and mitigation methods

Theyab¹

2018

OAJS

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Crude oil transportation in the pipelines of the cold environment is affected by the low temperature causing a problem such as wax deposition. The flow assurance in the hydrocarbon pipelines is very important due to the precipitation of the solid phase of wax on the pipe wall creating pressure abnormalities and causing an artificial blockage leading to a reduction or interruption in the production. Wax can precipitate as a solid phase on the pipe wall when its temperature (inlet coolant temperature) drops below the wax appearance temperature (WAT). In this review, wax deposition process is discussed. Also, proposed wax deposition mechanisms are outlined including molecular diffusion, shear dispersion, Brownian diffusion and gravity settling. Furthermore, the factors affecting the wax deposition process are explained, such as pipe wall temperature (inlet coolant temperature), crude oil composition, crude oil temperature, ambient temperature, flow rate, thermal history, time and pressure. There are several mitigation methods were used in the different oil fields around the world to reduce wax deposition such as pigging, inhibitors and thermal insulation.Citation: Theyab MA. Wax deposition process: mechanisms, affecting factors and mitigation methods. Open Access J Sci. 2018;2(2):109-115.

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Section: Methodsmentioning

confidence: 99%

Wax deposition process: mechanisms, affecting factors and mitigation methods

Theyab¹

2018

OAJS

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“…We selected the additive concentration of 3000 ppm, since this concentration has already been used for additives based on EVA copolymers. [12,13] As shown in Table 3, in the absence of additives, for the four systems the pour point correlates with the molar mass of the alkane that predominates in each paraffin sample. Regarding the additives' performance, the results indicate that for wax samples P120 and P140, the copolymers were ineffective as pour point depressants.…”

Section: Evaluation Of the Additives' Efficiency As Wax Deposition Inmentioning

confidence: 95%

Is There any Relation Between the Solubility of a Polymeric Additive and its Performance as a Pour Point Reducer?

Mansur

Lima

Spinelli

et al. 2006

Macromolecular Symposia

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Summary: In this work, polymeric additives based on poly(ethylene-co-vinyl acetate) were chemically modified by inserting different contents of hydrocarbon chains (C14). The performance of the modified copolymers as organic deposition inhibitors (ODI) was evaluated using a model system composed of different types of paraffins by measuring the pour point and viscosity of these systems. The phase behavior of the modified copolymers was evaluated in systems with different solubility parameters in order to correlate the additive's performance as ODI and the esteem solubility parameter of these modified copolymers. The results show that the EVA modified copolymers performed better ODI than those obtained for non-modified copolymer. However, the molecule must retain a hydrophobic-lypophobic balance in order to keep its capacity to modify the paraffin crystal. Moreover, copolymers with similar solubility parameters did not present the same pour-point values, which suggests that the solubility of the additive is important, but is not the only factor that influences the additive performance.

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“…The early authors mainly recommended mechanical methods of paraffin removal. Mechanical methods (Woo et al, 1984) are still in use, and in many cases, the most cost effective way to deal with the paraffin problem. Many of the more recent authors mentioned mechanical methods, but provided very little details of the practice.…”

Section: Mechanical Methodsmentioning

confidence: 99%

“…Svetgoff (1984) and Wagner (1989) reported success in combating paraffins using inhibitors. Woo et al (1984) noted that crystal modifiers are highly selective. They used a blend of crystal modifiers in a controlled release pellet, measuring the time required to dissolve the pellet.…”

Section: Crystal Modifiersmentioning

confidence: 99%

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Treating paraffin deposits in producing oil wells

Noll¹

1992

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Paraffin deposition has been a problem for operators in many areas since the beginning of petroleum production from wells. An extensive literature search on paraffin problems and methods of control has been carried out, and contact was made with companies which provide chemicals to aid in the treatment of paraffin problems. A discussion of the nature of paraffins and the mechanisms of this deposition is presented. The methods of prevention and treatment of paraffin problems are summarized. Suggested procedures for handling paraffin problems are provided. Suggestions for areas of further research and testing are given.

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Long-Term Control of Paraffin Deposition.

Abstract: controlled-release matrix form has successfully prevented paraffin deposition.. Paraffin-related problems occur in almoet all oil producing areas throughout the world. These

Cited by 29 publications

References 5 publications

Wax deposition process: mechanisms, affecting factors and mitigation methods

Wax deposition process: mechanisms, affecting factors and mitigation methods

Is There any Relation Between the Solubility of a Polymeric Additive and its Performance as a Pour Point Reducer?

Treating paraffin deposits in producing oil wells

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