Gravel Packed Wells in the Statfjord Field: Completion, Workover and Production History

Nedregaard, Rune; Lejon, Kjell O.

doi:10.2523/36947-ms

Cited by 3 publications

(3 citation statements)

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“…Poor trends in cased hole gravel pack (CHGP) productivity following water breakthrough on several fields 3,11,12 has lead the operator to adopt open hole solutions as its primary sand control strategy. Over the last ten years the operator has completed over 450 wells with sand control completions off the NCS.…”

Section: Sand Control Requirementsmentioning

confidence: 99%

“…From a drilling and well engineering perspective, IOR technologies such as extended reach drilling (ERD) 1 , multi-lateral wells 2 , improved completion design 3 and water alternating gas injection 4 have been implemented. The ambitious drilling and completion objectives set for the Statfjord Late-Life (SFLL) project is probably the last major attempt to improve recovery from the field.…”

Section: Introductionmentioning

confidence: 99%

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Drilling and Completion Challenges of the Statfjord Late Life Project

Hovring

Løklingholm

Zwaag

et al. 2009

SPE/IADC Drilling Conference and Exhibition

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The further development of the Statfjord field for the Late Life pressure blowdown phase requires the drilling and completion of many infill wells from existing slots. The overall objective of these wells is to maximize oil production in the short term whilst securing future gas delivery potential for the late life phase. Well design to meet this objective is challenging. The Statfjord and Brent formations are sand prone and robust mechanical sand control completions are required in order to secure offtake rates during late life production. Also, after 28 years of production and water injection, the drilling and completion of wells through the differentially depleted formations is challenging due to a narrow pore pressure/fracture pressure window. Furthermore, the reservoir formations are substantially interlayered with shale sections and this meant that wellbore stability issues would pose significant challenges.Initial Late-Life well designs were based on drilling long open hole sections with an oil-based drilling mud providing low Equivalent Circulating Density (ECD), displacing the well to brine, and then running sand screens and performing an open hole gravel pack (OHGP) across the reservoir section with a conventional water pack. During the last three and a half years 27 Late-Life producers have been drilled and completed. This paper summarizes the operator's experiences over this period with emphasis on well design, drilling and completion tools, well fluid technology and well productivity. It explains how ambitions and well design had to be reassesed in order to overcome several challenges with the selected drilling and completion strategy.

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Section: Sand Control Requirementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Drilling and Completion Challenges of the Statfjord Late Life Project

Hovring

Løklingholm

Zwaag

et al. 2009

SPE/IADC Drilling Conference and Exhibition

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“…As a result, internal gravel packing was chosen for infill well design. In the period from 1990 to 1995, eight wells were completed with casedhole gravel packs 9 . These completions were successful at excluding sand and they had good initial production results.…”

Section: Sanding Tendencies and Historical Sand Controlmentioning

confidence: 99%

Production Enhancement From Sand Management Philosophy: A Case Study From Statfjord and Gullfaks

2005

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractStatfjord and Gullfaks are "Brown" fields operated by Statoil in the Tampen area of the North Sea. The production from these fields is characterized by large volumes of water and increasing sanding tendencies. The operator has for many years followed a strategy whereby sand produced with the wellstreams has been handled topsides prior to on-site disposal. The adoption of a sand management strategy has been crucial for prolonging economic reservoir development during tail production. By choosing to deal with sand topsides the operator has been able to pursue low cost slot replacement drilling where wells are completed without sand control equipment. The cased-hole functionality has facilitated multitarget drilling and is suited to selective production of each sand member through cheap plug/perf interventions.Significant gains in production (acceleration) and reserves (IOR) have resulted from the pursuance of sand management in these fields. Examples of wells showing productivity improvements as a direct result of allowing intervals to produce sand are presented. In addition, production gains achieved from replacing choked back "sand free" production with "maximum acceptable sand rate" production are presented. Increased sand tolerance has also led to reserve increases in some wells as unproductive intervals that were previously sanded up have cleaned up and started to flow. It will be argued that this strategy negates many concerns with formation damage during well work because such damage is produced out with the sand and the wells clean up naturally.The transient nature of sand production is discussed and the production gains observed in each field is presented. Such a strategy requires that the sand production is managed in a safe and controlled manner where the negative consequences of sand production are manageable and predictable. This paper will also discuss the improvements made in sand detection and on-line erosion mapping required to improve the sand tolerance of these facilities.

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A Stimulation Treatment of a Sub Sea Well Using a Scale Dissolver

Børeng

Bakken

Vikane

et al. 1999

SPE International Symposium on Oilfield Chemistry

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The Stattjord East and North are two sub sea fields tied in to the Stattjord C platform on the Stattjord Field. A well, on the Stattjord East satellite was damaged during the gravel pack operation. The damage is believed to be rust particles due to use of dirty drill collars during placement of the pre pack gravel. The productivity index, PI, of the well after clean up of the perforations, i.e. prior to gravel packing, was calculated as 742 Sm3/d/bar. After gravel packing and bean up of the well, the PI was calculated as 55 Sm3/d/bar. The well observed increased productivity to about 80 Sm3/d/bar before its decline prompted the use of a scale dissolver to remove the damage. The challenge was to pump the scale dissolver 7.8 km from the platform out to the wellhead template through a 2.5 inch methanol line. At the time of performing the stimulation treatment the oil rate of the well was 776 Sm3/d with a PI of 11 Sm3/d/bar. The maximum pumping rate during the operation was 800 litres per minute. After the scale dissolver had been soaked in the gravel pack for 12 hours, the well was put on production and it delivered 2600 Sm3/d of oil. The PI was increased to 55 Sm3/d/bar. A decline in production was observed, and after a year a second squeeze was performed successfully. The PI increased this time from 23 to 59 Sm3/d/bar and the oil production increased with 1000 Sm3/d. For the first time in the Norwegian North Sea, successful stimulation treatments of a sub sea satellite well has been achieved by pumping a scale dissolver through a 2.5″ methanol line into a 5.5″ completed well. The evaluation of the data has shown that the plugging process is complex and difficult to interpret. However, it can be concluded that injection of fluids has improved the gravel pack productivity. The erosion potential has also been minimised due to reduced draw down across the gravel pack. The damage mechanism is most likely a combination of rust, brine and fines plugging the wire wrapped screens and the poorly filled perforation tunnels. The first stimulation operation had a payback time of 2 days and the second operation 4 days.

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Gravel Packed Wells in the Statfjord Field: Completion, Workover and Production History

Cited by 3 publications

References 0 publications

Drilling and Completion Challenges of the Statfjord Late Life Project

Drilling and Completion Challenges of the Statfjord Late Life Project

Production Enhancement From Sand Management Philosophy: A Case Study From Statfjord and Gullfaks

A Stimulation Treatment of a Sub Sea Well Using a Scale Dissolver

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