Do Complex Super-Gel Liquids Perform Better Than Simple Linear Liquids in Hole 
Cleaning With Coiled Tubing?

Li, Jeff; Wilde, Graham; Crabtree, Alexander

doi:10.2523/94185-ms

Cited by 12 publications

(13 citation statements)

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“…After penetration of the fill, the sweep fluid compliments the wiper trip speed optimization. It was observed by Li et al 9 that the minimum flow rate with gel was almost half that of water between 30 -65 degrees. Given the small coiled tubing used, the result was complete fill removal in a single trip.…”

Section: Wellbore Cleaning Methods and Gels Combinedmentioning

confidence: 91%

“…Given the small coiled tubing used, the result was complete fill removal in a single trip. It should be noted that at near horizontal conditions, the minimum flow rate for solids transport with water and gels are essentially the same 9 . Only as the angle progresses near to and greater than 65 degrees do the superior properties of the gel become apparent.…”

Section: Wellbore Cleaning Methods and Gels Combinedmentioning

confidence: 98%

“…They can reduce friction and often exhibit a greater carrying capacity than that of water at low shear rates 3,9 . At near horizontal conditions, friction reduced water is often better because turbulent water is better at entraining solids for transporting them further up the well bore.…”

Section: Viscous Gels and Cleaningmentioning

confidence: 99%

“…However, at angles from 30 -60 degrees, gels perform more efficiently than water. This is due to gravity effects that cause the bed to slide downwards, allowing re-entrainment of the particles into the flow stream permitting the gels' superior suspension ability to be utilized 9 .…”

Section: Viscous Gels and Cleaningmentioning

confidence: 99%

“…The sweep fluid was then capable of capturing hole fill near the nozzle exit for transport up the well. It should be noted that even with the advanced fluid properties of the sweep fluid, the stationary solids bed is not eradicated 9 . This implies the use of a wiper trip is necessary to clean the entire wellbore.…”

Section: Viscous Gels and Cleaningmentioning

confidence: 99%

See 4 more Smart Citations

Software, Fluids, and Downhole Tools for Successful Sand Cleanouts in Any Wellbore Geometry Using Small Coiled Tubing

Gilmore¹,

Leonard²,

Steinback³

2005

Proceedings of SPE Annual Technical Conference and Exhibition

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Section: Wellbore Cleaning Methods and Gels Combinedmentioning

confidence: 91%

Section: Wellbore Cleaning Methods and Gels Combinedmentioning

confidence: 98%

Section: Viscous Gels and Cleaningmentioning

confidence: 99%

Section: Viscous Gels and Cleaningmentioning

confidence: 99%

Section: Viscous Gels and Cleaningmentioning

confidence: 99%

See 3 more Smart Citations

Software, Fluids, and Downhole Tools for Successful Sand Cleanouts in Any Wellbore Geometry Using Small Coiled Tubing

Gilmore¹,

Leonard²,

Steinback³

2005

Proceedings of SPE Annual Technical Conference and Exhibition

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Effective Heavy Post-Fracturing Proppant Cleanout with Coiled Tubing: Experimental Study and Field Case History

Li¹,

Bayfield²,

Paton

2006

SPE Annual Technical Conference and Exhibition

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractBauxite ceramics are a high strength proppant, which is often used for fracturing stimulation in deep and hot wells. Due to its higher specific gravity (3.5 -3.6), it is very challenging to design and execute the post-fracturing proppant cleanout with coiled tubing (CT) successfully in the highly deviated large wellbore.In a sand cleanout with CT the solids are moved by two modes of transport: circulation and wiper trip, in which the localized fluidization is caused by jet turbulence. The jetting turbulence is produced by the down hole wash tool, and as the CT is pulled from the hole it fluidizes and propels the solids in the direction of the wellhead. Some of these solids may stay in suspension and be circulated out of the well depending on the flow velocities, hole geometry and fluid choice. The remainder will tend to fall out of the flow channel downstream from the wash tool. These solids will be continually refluidised by the movement of the wash tool. The speed with which the wash tool can be pulled out of the hole is a complex function of the choice of fluid, flow velocities, hole geometry, hole deviation and the physical properties of the particles. When conditions result in complete removal of the solids, the corresponding maximum value of the CT speed is defined as the optimum wiper trip speed.In this study, the solids transport test results with bauxite in a full scale flow loop are summarized and four case histories performed on both subsea and land wells are presented. The engineering, implementation and challenge of CT post-fracturing sand cleanout for each individual field case are discussed. The paper also describes how to use a customized down hole switchable wash nozzle and a sophisticated solids transport computer modeling software to optimize the post-fracturing sand cleanout process with 100 % removal efficiency.

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Fills Cleanout With Coiled Tubing in the Reverse Circulation Mode

Li¹,

Luft²

2006

IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition

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fax 01-972-952-9435. AbstractRemoving sand fills from wellbores is one of the major applications for coiled tubing (CT). For the fills cleanout process, the fluid could be circulated in two different modes: forward circulation and reverse circulation. In the forward circulation mode, the carrying fluids are pumped through the CT down to bottom and flowed back to surface in the CT/casing annulus. For reverse circulation, fluids are pumped down the CT/casing annulus and back up the coil. In many cases with large completions and low reservoir pressures, the forward circulation mode cannot effectively clean the fills out of the annulus with only a limited available flow rate or without circulating expensive gel fluids, especially for the heavier particulates in deep and/or highly deviated wells. Due to the smaller flow areas and therefore higher velocities, fills may be more readily transported inside the CT flow channel. Therefore, reverse circulation may be an option to overcome the above constraints associated with forward circulation.Several major risks for reverse circulation with CT include coil collapse, loss of well control and sand bridging in the coil. Controlling the rate of penetration (ROP) of the CT into the fill is very critical for the reverse circulation sand cleanout process. There is a lack of knowledge on the effect of as well as optimum ROP during reverse circulation. In this paper, the maximum ROP for different sand types at different deviated angles and water flowrates for reverse circulation cleanouts are investigated with a full scale flow loop test facility. Based on these test results, empirical correlations have been developed and incorporated into an existing proprietary solids transport computer algorithm, which can now be used to optimize the hole cleaning process for both the forward and reverse circulation modes of solids transport.

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Do Complex Super-Gel Liquids Perform Better Than Simple Linear Liquids in Hole Cleaning With Coiled Tubing?

Cited by 12 publications

References 0 publications

Software, Fluids, and Downhole Tools for Successful Sand Cleanouts in Any Wellbore Geometry Using Small Coiled Tubing

Software, Fluids, and Downhole Tools for Successful Sand Cleanouts in Any Wellbore Geometry Using Small Coiled Tubing

Effective Heavy Post-Fracturing Proppant Cleanout with Coiled Tubing: Experimental Study and Field Case History

Fills Cleanout With Coiled Tubing in the Reverse Circulation Mode

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