Remedy of Severe Scale Build Up Issue in OMV (Pakistan) at Well 'X'

Hassan, Syed Saadat; Ahmad, Tofeeq; Farooqui, Shoaib; Ali, Haseeb Mazhar; Qamar, Atif

doi:10.2118/156210-ms

All Days 2011

DOI: 10.2118/156210-ms

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Remedy of Severe Scale Build Up Issue in OMV (Pakistan) at Well 'X'

Syed Saadat Hassan¹,

Tofeeq Ahmad²,

Shoaib Farooqui

et al.

Abstract: With current demand for gas at historic peak, any decrease in production due to deposits of scale within tubing is the most troublesome for any E&P company. Statistically 28% of time it is the scale in well that hinders producing it at optimum rate. "Carbonate" and "Sulfate" scales are most common of mineral scales that form in wells. Carbonate scales are generally tackled by wellbore cleanout with acid or by using scale inhibitors to slowdown scale deposition process but none of these solutions solve the prob… Show more

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Cited by 4 publications

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Downhole Scales Management in Mature Gas Fields

Ghouri¹,

Ali²,

Shah³

et al. 2018

All Days

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Dealing with mature fields in a period of low oil price, companies have focused their activity on intensive rig-less campaigns aimed at increasing fields’ recovery factors and production. Aging of the fields together with pressure decline and onset of water production has added the complexity of scale deposition in numerous wells. Scale can deposit at any location that is in contact with water, such as in the reservoir, well bore, tubing, top side and processing facilities and cause production decline and flow restriction if not properly controlled. This paper will be dedicated to show the selection of the right subsurface intervention technique and the prevention of scales re-occurrence has been wisely decided based on scale management approach which covers scale prediction and prevention techniques. Conventionally, scale is controlled by the use of chemical inhibitors either by squeeze treatment into the reservoir or continuous / batch injection into the well. ‘’Prevention is better than cure’’ is the right motto for preventing re-occurrence of scale. Successful experience gained through the application of some new scales inhibition techniques was the key to implementing these preventive methods on different wells in operated and non-operated fields.

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Downhole Scales Management in Mature Gas Fields

Ghouri¹,

Ali²,

Shah³

et al. 2018

All Days

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Experimental Investigation of the Impact of Electromagnetic Devices on Barium Sulphate Scaling

Singleton¹,

Davis²

2020

Day 1 Wed, June 24, 2020

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Electromagnetic Devices (EMDs) have been used for scale management in the field. The proposed mechanism for their function is that the device imparts an electromagnetic pulse that provides sufficient energy to cause homogeneous nucleation, resulting in the formation of very small particles (5-8 microns) which pass through the production system, preventing heterogeneous nucleation and deposition. This paper summarises an experimental programme to examine the proposed mechanism of operation of the EMD under controlled laboratory conditions. Flow experiments were performed under ambient conditions using a mixed North Sea Seawater (NSSW) / Nelson Forties Formation Water (NFFW) scaling system. Experiments were performed with the EMD active and compared to baseline experiments where the EMD was inactive, to assess if the device impacted the scaling process. A full quantitative assessment for each experiment was performed including; assessment of the mass of scale deposited and its location, full effluent analysis by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP) and effluent sample filtration for solids content, morphology using Environmental Scanning Electron Microscopy / Energy Dispersive X-ray (ESEM/EDX) analysis and particle size distribution (PSD). From the experiments performed, it was found that the device impacted the scale deposition process in comparison to when it was not activated. Results indicated that although a similar amount of scale is lost from solution, less deposit was collected in the test apparatus itself. The precipitate in the effluent samples (which had passed through the apparatus) was found to have a mean particle size in the region of 10 microns, with a significant proportion of the distribution of particles below 1 micron; this was confirmed by ESEM/EDX and PSD. A further particle distribution range was identified as less than 0.22 microns. This material (10-20% of that injected) passed through the 0.22 micron filter used to collect the solid, but was accounted for when the experimental procedure was adapted. The results from this study indicate that under the conditions used, the EMD has an impact on the scaling process resulting in homogeneous nucleation of smaller scale particles that are transported through the apparatus. This supports the mechanism reported previously and provides a greater understanding to how such devices work in the field.

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Unravelling the Mystery of Inhibitor Resistant Calcite Impacting Onshore and Offshore Operations

Bourne¹,

Abbasov²,

Smith³

2022

Day 1 Wed, May 25, 2022

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Magnesian calcite has been identified as the main constituent of solids fouling several bp facilities in the North Sea and Azerbaijan and in partner operations in other locations. These solids were, for many years, thought to be calcite scale for a number of reasons. The deposits formed compacted solids and thus looked similar to scale, they effervesced and dissolved in acid and calcium was detected as the main constituent. XRD analysis, however, revealed the deposits were magnesian calcite. The inclusion of magnesium into the crystal cannot be co-precipitated with calcite scale under typical oilfield conditions and timelines and their deposition cannot be controlled by conventional scale inhibitor injection. These solids, transported from the reservoir with the produced fluids can act as scavenger sites, reducing the effective concentration of scale inhibitors available to manage conventional scale deposition. The fact that these solids, in many ways, present themselves as a conventional scale has perhaps hidden the extent of their occurrence in offshore and onshore operations. Magnesian calcite has been identified as the main constituent of retrieved solids that were (1) adhered to tubing and restricting production in a North Sea field (2) impacting operation of subsurface safety valves in both North Sea and Caspian Sea operations (3) reducing the efficiency of heaters and coolers offshore North Sea and onshore in the Caspian and (4) plugging strainers in the produced water handling systems offshore North Sea and onshore Caspian. This paper will describe how this ‘pseudo scale’ was detected and its prevalence, using field case examples from several bp operated and non-operated assets. It describes the theories developed to rationalise magnesian calcite deposition onto production surfaces including the possible role of ‘sticky’ molecules and the technology bp is evaluating to holistically manage this fouling phenomena. It will share dispersant chemical field trial performance data and the deployment of electromagnetic fields to determine the impact of changing zeta potential on the attraction of fine magnesian calcite particles to the surface and thus the fouling rate.

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Remedy of Severe Scale Build Up Issue in OMV (Pakistan) at Well 'X'

Cited by 4 publications

References 0 publications

Downhole Scales Management in Mature Gas Fields

Downhole Scales Management in Mature Gas Fields

Experimental Investigation of the Impact of Electromagnetic Devices on Barium Sulphate Scaling

Unravelling the Mystery of Inhibitor Resistant Calcite Impacting Onshore and Offshore Operations

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