An Integrated System Approach to Wellbore Cleanouts With Coiled Tubing

Radovan, Rolovic; Xiaowei, Weng; Stephen, Hill; Geoff, Robinson; Kean, Zemlak; Jeyhun, Najafov

doi:10.2523/89333-ms

Proceedings of SPE/ICoTA Coiled Tubing Conference and Exhibition 2004

DOI: 10.2523/89333-ms

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An Integrated System Approach to Wellbore Cleanouts With Coiled Tubing

Rolovic Radovan¹,

Weng Xiaowei²,

Hill Stephen³

et al.

Abstract: TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractWellbore cleanouts represent the main application of coiled-tubing (CT) services. Despite a long history of utilizing CT to remove sand and other fill material from oil and gas wells, advancement in the technology, and a growing body of experience, many wells are still not cleaned adequately, some wells cannot be cleaned at all, and a downhole stuck CT or other serious problems are encountered too often. Based on gathered experience and extensive research and… Show more

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Optimization of Coiled-Tubing Acidizing Through Real-Time Staged Fluid Tracking

2006

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractIn coiled tubing acidizing, a variety of fluids are pumped through coiled tubing in certain sequence to create the optimized downhole condition to treat the wellbore. Typically, prior to the coiled tubing reaching the target treatment zone, a neutral fluid may be pumped into coiled tubing during running-in-hole (RIH) for circulating purpose. Once at the targeted treatment zone, a pumping schedule (such as pre-flush, treating and postflush fluids) may be used to treat the wells. During the operations, the coiled tubing operator may also move the coiled tubing (either running-in-hole or pulling-out-ofhole) while staged fluids are being pumped. It is desirable to track the movement of staged fluids inside coiled tubing to optimize the treatment. This paper presents a new technology to track the movement of stage fluids inside coiled tubing. It includes real time surface and downhole measurements, fluid and gas modelings and friction pressure drop calculation along coiled tubing. This new technology allows operators to optimize coiled tubing running speed and surface pumping to create the desired action downhole. The availability of staged fluids information downhole also opens the possibility for real time treatment evaluation. Several field job cases are reviewed to demonstrate the effectiveness of this new technology.

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Optimization of Coiled-Tubing Acidizing Through Real-Time Staged Fluid Tracking

2006

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Use of a Non-Invasive, Non-Damaging Blocking Agent for Improved Cleaning in Low Bottomhole Pressure Wells

Ananaba

Hain

White

et al. 2014

SPE Annual Technical Conference and Exhibition

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Solids removal from severely depleted wells remains a challenging intervention operation in the oil and gas industry. The various cleanout options that exist generally require significant expense, and may result in loss of potentially damaging fluids or permeability reduction to zones with low bottomhole pressures. This paper will focus on several field trials in South Texas utilizing a fluid-based, formation-blocking agent as part of the cleanout circulating fluid. The blocking agent has been in use for several years in cement spacer systems as a lost circulation material (LCM) with favorable results. The blocking agent uses a modified, hydrophobic polysaccharide to form micelles. Under differential pressure the micelles adsorb and realign in a layer along the formation or perforation tunnel forming an impermeable seal effectively blocking the loss of fluids to the formation. With the formation blocked, the solids can be circulated out using a higher density fluid and at higher circulation rates than the low-pressure reservoir would support. When the well is returned to an underbalanced system, the micelles will disperse, returning the fluid to its original state and restoring permeability to near a pre-intervention level. The case histories included in this paper are the first application of this material for well intervention operations outside a cement spacer application, and the results discussed show that the material performed remarkably well.

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An Integrated System Approach to Wellbore Cleanouts With Coiled Tubing

Cited by 2 publications

References 0 publications

Optimization of Coiled-Tubing Acidizing Through Real-Time Staged Fluid Tracking

Optimization of Coiled-Tubing Acidizing Through Real-Time Staged Fluid Tracking

Use of a Non-Invasive, Non-Damaging Blocking Agent for Improved Cleaning in Low Bottomhole Pressure Wells

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