Experience with Horizontal Wells in the Statfjord Field

Kostøl, Petter; Berg, Dag P.

doi:10.2118/31144-ms

Cited by 3 publications

(3 citation statements)

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“…1 Perforating underbalanced allows the debris in the perforating tunnel to be cleaned more easily. During the past few years, techniques to perforate wells without having to use kill fluid have been developed.…”

Section: Introductionmentioning

confidence: 99%

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Innovative Live Well Perforating System Used in the Statfjord Field

et al. 1998

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThis paper describes a system developed for live well perforating and presents several case histories of its usage. The system has currently been used on 13 jobs on the Statfjord field. A total of 2106 m has been perforated, and the longest interval in one run has been 277 m in this particular field. The system has been used both for initial perforation on new wells and reperforation in live wells or in combination with zone isolation. Both injectors and producers have been perforated using this system.An optimum perforating strategy can have significant impact on the economy of a well. During the past few years, techniques to perforate wells without having to use kill fluid have been developed. This reduced the cost and the problems that can occur as a result of kill the well. Kill fluid can not only affect the productivity of the wells, but may also create problems when produced back to the hydrocarbon process equipment. In addition, it has been noted that a higher and more stable sand free production rate will be obtained if the entire interval is perforated simultaneously. 1 Perforating underbalanced allows the debris in the perforating tunnel to be cleaned more easily. 2 If the well does not have to be killed, considerably less formation damage will occur, and the costs of kill fluid, lifting the well, and handling of the returned kill fluid are also eliminated.This paper describes a new live well perforating method deployed with a hydraulic workover unit, that allows long intervals to be perforated in wells with complicated well trajectories

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Section: Introductionmentioning

confidence: 99%

“…1 Perforating underbalanced allows the debris in the perforating tunnel to be cleaned more easily. The system has currently been used on 13 jobs on the Statfjord field.…”

mentioning

confidence: 99%

Innovative Live Well Perforating System Used in the Statfjord Field

et al. 1998

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“…3 Most new wells will be multitarget horizontal wells to penetrate unswept areas of the Statfjord and Brent main field reservoirs. New lines of producers and injectors were established leading to a number of workovers and recompletions.…”

Section: Introductionmentioning

confidence: 99%

Designing Wells on a Lifecycle Basis: A Case Study from the Statfjord Field

Kostøl

Nedregaard

1998

All Days

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To achieve the goals of maximum lifecycle value of wells in the Stafjord field, continuous improvements in well design, completion and well intervention techniques have been made over the past 10 years, A major challenge has been to simultaneously optimise reservoir penetration, drilling and completion operations and later well interventions, This paper will review the development in the well design and completion techniques from the low angle « 60°) wells with cemented liner and step down nipple profile completion to the horizontal and extended reach wells with monobore completions, This includes the lessons learned from the numerous workovers performed and how they lead to a change in completion design to ensure reliability, redundancy and optimised production. The impact of the well profile and how it should be optimised for future light interventions, i.e. coiled tubing, or wireline tractor will also be discussed.Finally, the advantages of working in multi-disciplinary teams from the early planning stage to completing the well will be addressed.

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Orienting Live Well Perforating Technique Provides Innovative Sand Control Method in the North Sea

Eriksen¹,

Sanfilippo²,

Kvamsdal

et al. 1999

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe Varg field is a development in the North Sea operated by Saga Petroleum. It consists of a not-normally-manned wellhead platform (WHP) with dry wellheads and a floating production storage offloading (FPSO) vessel for processing the crude. The reservoir is heterogeneous sandstone of Upper Jurassic age, with estimated reserves of approximately 35 million stock-tank barrels.During development planning of the field, it was felt that sand production was likely to occur, and this phenomenon was actually experienced during well testing. Since this development was considered to be a marginal field, an extensive program was initiated to review and select a technical completion solution that would minimize the risk of sand production so that production potentials could be maximized. This paper will discuss how a unique perforating solution was developed to provide the controls needed to manage the potential for sand production.The first part of this paper will summarize: 1) the drainage strategy and implications of this strategy on selecting the perforation intervals, and 2) results of a rock mechanics study that focused on the conditions critical for the onset of sand production as well as recommendations for minimizing the risk. The primary recommendations were to avoid perforation of the weakest intervals and to shoot perforations that would be oriented parallel to the maximum horizontal stress.The second part of the paper will describe how successful oriented perforating was achieved in these wells. The primary completion challenges included the following: 1. Development of a slickline system that could perforate the entire zone simultaneously in a given direction in a vertical well. 2. A means to remove the perforating guns from the well without having to kill it after completion of the perforation as there was insufficient rathole to leave the guns in the hole.An oriented modular perforating system was developed so that the above conditions could be achieved. The requirements were met by installing a gun anchor in the well before the completion was installed. Then, the orientation of an orienting lug was measured with a gyro, and based on the data from the survey, the guns were aligned in the correct orientation. Subsequently, gun sections of length maximized to available lubricator length were run on slickline. The gun section aligned itself automatically to the measured orientation of the orienting lug because of the equipment design. Currently, three wells have been perforated using this system, and the desired results have been obtained.

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Experience with Horizontal Wells in the Statfjord Field

Cited by 3 publications

References 1 publication

Innovative Live Well Perforating System Used in the Statfjord Field

Innovative Live Well Perforating System Used in the Statfjord Field

Designing Wells on a Lifecycle Basis: A Case Study from the Statfjord Field

Orienting Live Well Perforating Technique Provides Innovative Sand Control Method in the North Sea

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