Case Study: Successful Application of a Novel Conformance Treatment in an Extended Reach Horizontal Well in the Al Shaheen Field, Offshore Qatar

Pedersen, Morten Høgholm; Lechner, Michael; Pon, Zaim Awang; Brink, David Ian; Abbasy, Imran; Jaafar, Mohd Rushdan

doi:10.2523/iptc-13645-ms

Cited by 5 publications

(1 citation statement)

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“…In other places in the field where water shut offs have been discovered to be impossible due to the presence of tubing holes or leaking SSDs, solutions such as gels, cement or enzymatic calcium carbonate are being evaluated (Heijnen, 2009, Pedersen, 2009). …”

Section: Next Stepsmentioning

confidence: 99%

Resolving a Water Shortcut Between Old Wells with Multiple Completion Zones: Example in the Dan Field

Eriksen

Hansen

Post

2010

SPE Annual Technical Conference and Exhibition

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In mature fields an important challenge is shutting off injection water breakthroughs. In the Dan field offshore Denmark developed with multi-zone completed long horizontal wells, the primary method now is closing Sliding Side Doors (SSDs) in the horizontal completions. A shortcoming of this method is that it does not work if there is communication between individual zones or holes in the tubing. This is the case in many of the up to 20-year-old wells.The primary goal of a recent coil tubing conveyed well intervention was to remove a shortcut between two horizontal wells: a producer with 16 sand fracced zones and an injector with 5 water fracced zones. This was planned to be done by closing one or two PSI zones in the injector. The connection could not be removed by shifting zones in the producer due to a restriction in the vertical section, making the horizontal completion of the well inaccessible.Production logging results of the shut in injector showed a substantial cross-flow from zones 1 and 4 into zone 3 via both the sliding side door and a hole in the zone. Due to the presence of cross-flow, the injection well was effectively injecting an estimated 4,000 bbl/d into the culprit zone, when closed in at surface. Due to the tubing leak in zone 3 it was not possible to stop the flow out of the zone by shutting the door, so all zones (1-5) in the well were closed, and injection was stopped. The closure of all zones in the injection well resulted in an immediate response in the production well, reducing water production with 6,000 stb/d while increasing the oil production with 1,200 stb/d.The intervention and responses in nearby wells indicated that the injection well was connected to up to three other water injection wells and up to two other production wells. In this paper the reasons for these short cuts and the impact it has on water flooding are analysed.The lack of water injection in the area has resulted in declined production in other wells, hence the future challenge for the area is finding a new way of shutting the connections either by means of chemical conformance treatment in cases of connected zones or straddles in wells with tubing holes.

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Section: Next Stepsmentioning

confidence: 99%

Resolving a Water Shortcut Between Old Wells with Multiple Completion Zones: Example in the Dan Field

Eriksen

Hansen

Post

2010

SPE Annual Technical Conference and Exhibition

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Bilinear modelling, control and stability of directional drilling

Inyang

Whidborne

2019

Control Engineering Practice

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This paper proposes an approach for the attitude control of directional drilling tools for the oil and gas industry. A bilinear model of the directional drilling tool is proposed and it characterises the nonlinear properties of the directional drilling tool more accurately than the existing linear model, hence broadens the range of adequate performance. The proposed bilinear model is used as the basis for the design of a Bilinear Proportional plus Integral (BPI) controller. The stability of the proposed BPI control system is proven using stability notions for LTI and LPV systems. The transient simulation results show that the proposed BPI controller is more effective, robust and stable for the attitude control of the directional drilling tool than the existing PI controller. The proposed BPI controller provides improved invariant azimuth responses and significantly reduces the adverse effects of measurement delays and disturbances with respect to stability and performance of the directional drilling tool.

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Bilinear modelling and bilinear PI control of directional drilling

Inyang

Whidborne

Bayliss

2016

2016 UKACC 11th International Conference on Control (CONTROL)

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This paper presents the design of an inclinationand azimuth-hold controllers and their subsequent stability and performance analysis for directional drilling tools as typically used in the oil industry. Using an input transformation developed in earlier work that partially linearizes and decouples the plant dynamics of the directional drilling tool, a bilinear model of the directional drilling tool is developed and is used as the basis for Bilinear PI controller design. Results for a transient simulation of the proposed BPI controller are presented and compared with that of the PI controller of the earlier work. It is presented that BPI controller gives more consistent responses over a broader operating range compared to the PI controller. In addition, the effect of time delay on the feedback measurements with respect to the stability and performance is investigated in the simulations.

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Case Study: Successful Application of a Novel Conformance Treatment in an Extended Reach Horizontal Well in the Al Shaheen Field, Offshore Qatar

Cited by 5 publications

References 0 publications

Resolving a Water Shortcut Between Old Wells with Multiple Completion Zones: Example in the Dan Field

Resolving a Water Shortcut Between Old Wells with Multiple Completion Zones: Example in the Dan Field

Bilinear modelling, control and stability of directional drilling

Bilinear modelling and bilinear PI control of directional drilling

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