Long-Term Control of Paraffin Deposition

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

doi:10.2523/13126-ms

Cited by 12 publications

(5 citation statements)

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“…Several methods for paraffin inhibition and removal (Woo et al, 1984;Wang, 1994;Chen et al, 2003), such as machinery, heating, and chemistry, are widely used in the worldwide oilfields. Because the chemical paraffin inhibition and removal method can solve the problem of paraffin deposit in oil wells and can mitigate the problem of paraffin deposition on the surface of ground equipment as well, it has become the most widely used method and get more and more popular in oilfields around the world.…”

Section: Introductionmentioning

confidence: 99%

Paraffin Deposition Mechanism and Paraffin Inhibition Technology for High-carbon Paraffin Crude Oil From the Kazakhstan PK Oilfield

Zhang

Ouyang

Feng

et al. 2013

Petroleum Science and Technology

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The compositions and structure of the Kazakhstan PK crude oil is analyzed in the methods of GC, 1 H-NMR, and DSC. It was found that the main reasons for paraffin seriously depositing on the well wall were the higher carbon numbers in the paraffin molecule, lower branched-chain degree in the paraffin molecule, the lower content ratio of asphaltene and resin to paraffin, wellhead temperature being lower than paraffin-appearing temperature, the higher gas-oil ratio, and lower water cut in the produced liquid. A new paraffin inhibitor whose paraffin inhibition rate is above 60% for the Kazakhstan PK crude oil was developed. Its paraffin inhibition mechanism is researched by using microscope and contact angle instrument. The paraffin inhibition mechanism is mainly to prevent formation of paraffin crystal with network structure by modifying paraffin crystals structure and to form the surface against paraffin deposition by changing the wettability of the paraffin deposition surface.

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Section: Introductionmentioning

confidence: 99%

Paraffin Deposition Mechanism and Paraffin Inhibition Technology for High-carbon Paraffin Crude Oil From the Kazakhstan PK Oilfield

Zhang

Ouyang

Feng

et al. 2013

Petroleum Science and Technology

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“…Historically, trickling in chemicals used for workover appeared to be an obvious extension of a cure into prevention. In recent years, many new chemicals have become available commercially [2,3]. However, the cost of these chemicals is high.…”

Section: Introductionmentioning

confidence: 99%

A Physical Preventive Treatment of Crystallization and Precipitation in the Petroleum Industry

Chen¹,

Chow²,

Yuan³

et al. 2001

Canadian International Petroleum Conference

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The plugging of tubings and pipelines by scale, asphaltene, and wax is a common problem in the oil production, transportation and refinery systems. Hot oiling, chemical wash and mechanical scraping have been used for many years to restore flow. There may be economic benefit to implement preventive treatments. We propose to consider the application of ultrasound as a potential preventive treatment. As a physical treatment, it is expected to be independent of the details of the chemical nature of the problem, i.e., it should be equally applicable to particles such as salt crystals, asphaltene precipitates, or wax. We will present experimental results showing the effects of application of ultrasound during precipitation and crystallization. Three systems were tested in this study; crystallization of salt from saturated aqueous solutions, re-dispersion of asphaltene in heptane, and pour point depression of diesel with different wax contents. The results show that, under the influence of ultrasound during the phase transition, there was a reduction of the size of the salt crystals, precipitated asphaltene was re-dispersed, and the temperature at the pour point of diesel with different wax contents was substantially lowered.

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“…Traditionally, various approaches have been undertaken to handle and/or operate problematic/waxy reservoir fluids. These include mechanical, thermal, chemical and/or combination of the three methods [1][2][3] . Of these, the use of chemicals (solvents, dispersants and inhibitors) to control paraffin problems in oil field systems is receiving considerable attention 4 .…”

Section: Introductionmentioning

confidence: 99%

Control of Wax Deposition: An Experimental Investigation of Crystal Morphology and an Evaluation of Various Chemical Solvents

Ferworn¹,

Hammami²,

Herb³

1997

Proceedings of International Symposium on Oilfield Chemistry

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractFour commercial solvents and o-xylene have been tested for their effectiveness in remediating paraffin (wax) depositions from three different dead oils. The dead oils were sampled from the North Sea, Alberta and Gulf of Mexico, respectively. Representative field solvent/oil concentrations of 2000 and 4000 ppm (vol) were prepared for each oil and solvent considered in this work. Two state-of-the-art techniques, namely a cross polar microscopy (CPM) and a rheometrics mechanical spectrometer (RMS 800), were used to study paraffin crystal habits and/or morphologies at 32°F, wax dissolution temperatures (WDT), and pour point temperatures of the three dead oils with and without solvents. It is found that in almost all cases, the 2000 ppm (vol) solvent concentration yielded similar or better remediation results than mixtures with 4000 ppm (vol) solvents. More importantly, it is shown that the remediation of wax deposition depends not only on the solvent concentration but also the type of oil and, in turn, waxes being treated (i.e., case specific). In some cases, the relatively cheap solvents outperform the more expensive o-xylene in dissolving wax deposits. Finally, a laser based solids detection system (SDS) was used to study the effect of o-xylene on the wax appearance temperature (WAT) of a second live fluid from the Gulf of Mexico.

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Long-Term Control of Paraffin Deposition

Cited by 12 publications

References 0 publications

Paraffin Deposition Mechanism and Paraffin Inhibition Technology for High-carbon Paraffin Crude Oil From the Kazakhstan PK Oilfield

Paraffin Deposition Mechanism and Paraffin Inhibition Technology for High-carbon Paraffin Crude Oil From the Kazakhstan PK Oilfield

A Physical Preventive Treatment of Crystallization and Precipitation in the Petroleum Industry

Control of Wax Deposition: An Experimental Investigation of Crystal Morphology and an Evaluation of Various Chemical Solvents

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