Improved Reservoir Management From Application of Intelligent Reservoir Completion Technology in an Extended-Reach Well in the Giant Al Shaheen Field, Offshore Qatar

Brink, David Ian; Ernst, Sabine Dyrvig; Banerjee, Sudeepto Nilmani; Ekwue, William; Ritchie, Barry; Maurer, Florian; Jensen, Nels Michael; Jaafar, Mohd Rushdan

doi:10.2118/134934-ms

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…For the ultra-long horizontal well, the efficient placement of conventional acids is critical. The difficulty of applying acid (HCl) in long horizontal wells to uniformly remove drilling damage has been identified by several authors (Brink et al 2010;Hoch et al 2010;Ritchie et al 2010). In the long horizontal well completion type, due to the limitation of Coiled Tubing (CT), acid diversion, or foam technology application, Controlled Acid Jetting (CAJ) and Acid Jetting methods are considered as the effective solution to stimulate the well.…”

Section: Acknowledgementsmentioning

confidence: 99%

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Acid Placement in Acid Jetting Treatments in Long Horizontal Wells

2011

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In the Middle East, extended reach horizontal wells (on the order of 25,000 feet of horizontal displacement) are commonly acid stimulated by jetting acid out of drill pipe. The acid is jetted onto the face of the openhole wellbore as the drill pipe is withdrawn from the well. The jetting action helps to remove the drilling fluid filter cake and promote the acid to penetrate into the formation and form wormholes to stimulate the well. However, with very long sections of wellbore open to flow, the acid placement and subsequent wormhole distribution and penetration depths are uncertain. We have modeled this process using a comprehensive model of acid placement and wormhole propagation in a horizontal well. We presume that the acid jetting tool removes the drilling mud filter cake, so that no filter cake exists between the end of the drill pipe and the toe of the well. Correspondingly, we assume that there is an intact, low-permeability filter cake on the borehole wall between the end of the drill pipe and the heel of the well. The drill pipe is modeled as being withdrawn from the well during the acid jetting treatment, as is done in practice. The acidizing simulator predicts the distribution of acid and the depths of wormholes formed as functions of time and position during the acid jetting treatment. The model shows that the acid jetting process as typically applied in these wells preferentially stimulates the toe region of the horizontal well. Comparisons of the simulation predictions with published data for acid jetting treatments in such wells showed good general agreement. Based on the simulation study, we present recommendations for improved acid jetting treatment procedures to improve the distribution of acid injected into the formation.

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Section: Acknowledgementsmentioning

confidence: 99%

“…Several papers have been published showing that well completions and intervention methods including future well stimulation techniques are an important component in field development concept (Brink et al 2010;Hoch et al 2010;Ritchie et al 2010).…”

Section: Acid Jetting Stimulation Treatmentmentioning

confidence: 99%

Acid Placement in Acid Jetting Treatments in Long Horizontal Wells

2011

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Increasing the Reach and Selectivity of Completions in Extended Reach Horizontal Wells

Ritchie

Pitts

Ven

et al. 2010

IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition

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Over 15 years of production and injection history within the Al Shaheen Field has provided more details on the reservoir heterogeneities and performance of extended reach horizontal wells. This additional data, along with the lateral extent of the reservoirs, has increased the need for longer and more selective horizontal completions. Three primary reservoirs have been developed to date and have different requirements regarding liners and completions. The commonality of all reservoirs is the requirement for long liners and completions in vertically shallow horizontal wells. As the completion philosophy has changed, new approaches have been developed for both deployment and selective isolation. A number of case histories are discussed to illustrate the evolution of the completion requirements. Modifications to zonal isolation, mud over air floatation, and remote triggered packers are some of the cases discussed. Two of the three reservoirs require acid stimulation to improve the production and injection performance of producers and injectors. Effective stimulation can not be accomplished through what would be considered typical placement techniques, due to the extreme lateral departure of these wells in shallow vertical reservoirs. Two techniques used are described along with some issues regarding hole-geometry in acid stimulated wellbores. The paper concludes with some future requirements for the further development of the Al Shaheen Field. Increased selectivity and the need for active zonal control will push the completion requirements beyond where they are today. New completion concepts are being actively researched and developed so that the reservoirs can be optimally managed.

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Pushing the Limits for Field Development

Hoch

Ohrt

Brink

et al. 2010

Abu Dhabi International Petroleum Exhibition and Conference

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The giant Al Shaheen field, offshore Qatar includes a stacked sequence of Lower Crectaceous, carbonate domimated reservoirs of a tight nature and limited thickness. A holistic development approach with real time adaption has been used to push the boundaries for the development and the field is today producing more than 300,000 barrels of oil per day in an injection supported development including the world’s longest horizontal wells of up to 12 kilometres. Innovative completion solutions, providing the means to manage reservoir heterogeneity further supports the adaptive development and have opened new possibilities for enhanced oil recovery. After discovery in the mid 1970’s the breakthrough in the development came in 1992 when Maersk Oil introduced horizontal well technology from the North Sea tight chalk fields. Effective drainage by the horizontal wells via increased reservoir contact in the thin and tight pay zones has been confirmed from pressure measurements, saturation profiles and seismic data. The horizontal wells have further allowed the 700 sq km offshore development to be developed from 9 platform locations. Development of the tight and thin reservoirs in the Al Shaheen field is challenged by lateral heterogeneities, dipping fluid contacts and varying oil viscosities. The ability to handle heterogeneity is supported through innovative horizontal completion solutions ranging. The development is based on high resoluition 3D reservoir models and development adaption to real time static and dynamic field information. Obtaining the optimal oil recovery is based on a detailed development strategy tailor made to specific reservoir characteristics and reservoir management and injection and production control.

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Improved Reservoir Management From Application of Intelligent Reservoir Completion Technology in an Extended-Reach Well in the Giant Al Shaheen Field, Offshore Qatar

Cited by 5 publications

References 9 publications

Acid Placement in Acid Jetting Treatments in Long Horizontal Wells

Acid Placement in Acid Jetting Treatments in Long Horizontal Wells

Increasing the Reach and Selectivity of Completions in Extended Reach Horizontal Wells

Pushing the Limits for Field Development

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