New methods for the selection of asphaltene inhibitors in the field

Balson, T.; Craddock, H. A.; Dunlop, James; Frampton, H.; Payne, G.; Reid, P.; Oschmann, Hans-Jörg

doi:10.1039/9781847550460-00254

Cited by 3 publications

(3 citation statements)

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“…The well model can also be divided into zones reflecting the dewaxing process stages performed by pumping coolant within the volume of 150 m 3 /day into hollow rods located in the tubing (Jorg Oschrmann, 2002). In zone I the temperature onto the tubing wall does not fall below 52 o C; therefore, it may be argued that there is a complete melting of paraffin within this area.…”

Section: Resultsmentioning

confidence: 99%

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

Лекомцев¹,

Kang²,

Galkin³

et al. 2020

PTQ

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One of the main oil production complications is that asphaltene-resin-paraffin deposits (ARPD) are formed during production wells' operation. This is an urgent problem in the oil and gas industry, especially in the fields of the Ural-Volga region (Russia). This study aimed to develop a technological solution for the effective thermal treatment of deposits based on the wells' thermal state calculation during a sucker rod pump operation. In practice, the thermal effect on ARPD is carried out by flushing-out with a hot agent (water, oil). Traditionally, flushes are carried out through the casing annulus. However, this method is ineffective due to large heat losses and the impossibility of heating the inner part of the tubing in a sufficient way, where ARPD is deposited. Dynamic modeling of the process was performed in the ANSYS Fluent software product. The heat problem was solved on the basis of the Navier-Stokes Reynolds-averaged heat and mass transfer equation. It was noted that the temperature of the injected agent (hot oil or water) affects the temperature of the tubing's inner wall to a lesser extent than the coolant flow rate. It has been established that it is impossible to reach the melting point of wax at the submersible pump level. The flow rate of the coolant affects this parameter more intensively. When flushing with hot oil 120°C with a flow rate of 300 m3 /day, the temperature above the pump will be equal to the wax melting temperature. Calculations indicate that it is most advisable to use oil heated to 120°C as a coolant for flushing wells than water with a 90°C temperature. The implementation of the methods proposed can be used on any well equipped with a sucker rod pump.

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Section: Resultsmentioning

confidence: 99%

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

Лекомцев¹,

Kang²,

Galkin³

et al. 2020

PTQ

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“…That depends on the presence of resins in the solution for optimum performance of these chemicals. In fact, the tests conducted on dead oil or a solution containing asphaltenes redissolved in an aromatic solvent can be useful for primary screening of ADs (Borchardt 1989;Bouts et al 1995;Manek 1995;Takhar 1997;Oschmann 2002). The secondary, more reliable, screening is done under reservoir conditions to meet plausible influence of thermodynamic conditions on dispersant performance.…”

Section: Introductionmentioning

confidence: 99%

“…Asphaltene dispersants (ADs) are a class of chemical additives which can be used to control asphaltene deposition (Oschmann 2002). They have been successfully applied to inhibiting and removing asphaltene deposits as a formation squeeze, batch, or continuous injection (Manek 1995).…”

Section: Introductionmentioning

confidence: 99%

A comprehensive experimental evaluation of asphaltene dispersants for injection under reservoir conditions

2016

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As the efficiency of dispersants with different origins is questionable for each typical oil sample, the present study provides a reproducible and reliable method for screening asphaltene dispersants for a typical asphaltenic crude oil. Four different asphaltene dispersants (polyisobutylene succinimide, polyisobutylene succinic ester, nonylphenol-formaldehyde resin modified by polyamines, and rapeseed oil amide) were prepared and their performance on two oils from an Iranian field under laboratory and reservoir conditions was studied. A thorough analysis including ash content and SARA tests was performed on the solid asphaltene particles to characterize the nature of deposits. Then a highly efficient carrier fluid, which is crucial when injecting dispersant into the wells, was selected from a variety of chemicals by comparing their solubility. In the next step, using an optical microscope, a viscometer, and a Turbiscan, the screening of dispersants under laboratory conditions was done on a mixture of dead oil and dispersant to evaluate the onset of asphaltene precipitation and its stability when titrating by a precipitant. Finally, two different mixtures of the efficient dispersants, live oil, and carrier fluid were used with the solid detection system (SDS) and the filtration method to examine their effects on the onset pressure of asphaltene precipitation and the asphaltene content of the crude oil under reservoir conditions. The results show that the combination of experimental methods used in this work could be consistently applied to screening asphaltene dispersants. Among the four different dispersants applied here, the dispersant based on nonylphenol-formaldehyde resin modified by polyamines showed the best performance on the available live oils. This chemical modified the onset pressure of asphaltene precipitation of light oil from 4300 psi to about 3600 psi and decreased the precipitated asphaltene of heavy oil by about 30 %.

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Demulsification of crude oil emulsion by capacitative sensor system measurement: introduction to apparatus and methodology

Kedar

Bhagwat

2019

Journal of Dispersion Science and Technology

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New methods for the selection of asphaltene inhibitors in the field

Cited by 3 publications

References 0 publications

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

Efficiency Evaluation of the Heat Deparafinization of Producing Well Equipped by Sub Pump With Hollow Rods

A comprehensive experimental evaluation of asphaltene dispersants for injection under reservoir conditions

Demulsification of crude oil emulsion by capacitative sensor system measurement: introduction to apparatus and methodology

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