Skin Damage Removal Using Coiled-Tubing Vacuum: A Case Study in Venezuela's Orinoco Belt

Figueroa, J.M.; Hibbeler, Jeffrey; Duque, Luis Humberto; Perdomo, Lenin

doi:10.2118/69532-ms

Cited by 16 publications

(4 citation statements)

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“…Several cleanout techniques have been developed over the years, these include stationary circulation, wiper tripping (1,2,(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18) , reverse circulation (19)(20)(21)(22) , sand vacuuming technology (23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)36,37) , and venturi sand/junk bailers (4,22,(38)(39)(40) .…”

Section: Sand Cleanout Methodsmentioning

confidence: 99%

“…Sand/Well Vacuuming Cleanout (3,(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37) Sand vacuuming technology has been developed and proven worldwide in operations on low-pressure reservoirs. The system consists of a specially designed jet pump fitted on concentric coiled tubing.…”

Section: Conventional Hole Cleaning Methodsmentioning

confidence: 99%

“…Typically, the tool would first be run in hole in fill removal mode and then switched at the toe of the well to fluid recovery mode and pulled back through the horizontal section. The well vacuuming system provides a localized drawdown at every point in the wellbore where the tool passes, removing localized mud damage and increasing the well production (24)(25)(26)(27)(28)(29)(30)(31) . The tool can be used to evaluate the production profile (24,28,35) (oil, water and even sand cut) across the horizontal sections.…”

Section: Conventional Hole Cleaning Methodsmentioning

confidence: 99%

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Sand Cleanouts With Coiled Tubing: Choice of Process, Tools and Fluids

Li¹,

Misselbrook²,

Sach³

2010

Journal of Canadian Petroleum Technology

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Summary Cleaning fill from wellbores is the most common coiled tubing (CT) application. The process is a function of multiple variables including fluid properties, flow velocities, wellbore geometry and deviation, pipe eccentricity, particle properties, fill penetration rate and wiper trip speed. Removing fill from wells with low bottom hole pressures (BHP) can be challenging especially if wells are completed with smaller diameter production tubulars which significantly reduce circulation flow cross-section and choke flow(1). Such challenges are further compounded by high deviation or horizontal well trajectories especially in large diameter wellbores. A variety of cleanout methods have been developed in the past, often incorporating high circulation rates, special fluids, wiper trips, or reverse circulation to remove solids. Many of these conventional sand cleanout methods often apply excess hydrostatic pressure on the formation, resulting in lost circulation in pressure depleted reservoirs. The conventional solution to overcome excess hydrostatic pressure has been to include nitrogen to reduce fluid density and thus lessen the hydrostatic head; however, sand vacuuming technology using a concentric coiled tubing (CCT) with a downhole jet pump is an alternative technique for removing fill without placing a hydrostatic load on the reservoir. This paper reviews the individual sand cleanout systems and discusses the advantages and limitations related to each method. In recent years, cleaning sand using the wiper trip method has become the preferred technique. However, an appropriate pump rate and reservoir pressure are needed to maintain a proper return flow rate to carry the sands to the surface. For pressure-depleted reservoirs completed with horizontal wells, a sand vacuuming system can be used to efficiently remove the debris without circulating nitrogen and without high pump rates. When the fill cannot be removed from large-diameter deviated wellbores using conventional low-cost cleanout fluids, then fluids with high solids suspension capability (under shear conditions) in conjunction with wiper tripping may be an economical option. The main application for the reverse circulation technique is cleaning sand from large diameter wellbores when the necessary pump rates for conventional "forward" circulation are not achievable. A venturi junk bailer is often used to retrieve larger or heavier material which cannot be circulated out by traditional methods. Field cases are provided, demonstrating how to select the proper cleaning method and how to efficiently remove sand from a wellbore based on both operational and logistical conditions.

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Section: Sand Cleanout Methodsmentioning

confidence: 99%

Section: Conventional Hole Cleaning Methodsmentioning

confidence: 99%

Section: Conventional Hole Cleaning Methodsmentioning

confidence: 99%

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Sand Cleanouts With Coiled Tubing: Choice of Process, Tools and Fluids

Li¹,

Misselbrook²,

Sach³

2010

Journal of Canadian Petroleum Technology

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“…• The well cleaning system provides a localized drawdown in the horizontal sections. This is beneficial in removing mud losses and skin damage 7,8,9 . The localized drawdown also allows the damaged zones, oil, water and gas zones to be identified.…”

Section: Cleanout Optionsmentioning

confidence: 99%

Horizontal Well Cleaning and Evaluation Using Concentric Coiled Tubing: A 3 Well Case Study from Australia

Kuchel¹,

Clark

Marques³

2002

Proceedings of SPE/ICoTA Coiled Tubing Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractSome of the horizontal wells that were drilled in the Saladin field on Thevenard Island in Western Australia have produced below expectations or have experienced sharp production declines. The reasons for this were not known, although the following were suspected to be contributing factors:• Reservoir quality could vary considerably.• The horizontal sections were intentionally drilled in a sinusoidal shape and the low points could become traps for sand and heavy fluids.

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