Laboratory Investigation and Field Use of a Novel Sand Cleanout Fluid System for High Temperature Applications

Xiao, Zhiyou; Shahin, Magdy; Hosein, Paul; dellorusso, Paul; Lungwitz, Bernhard R.; Samuel, Mathew

doi:10.2118/84887-ms

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…Gel breakers were not used at any stage of the formation damage tests with the new fluid system. The results of these formation-damage tests with the new fluid system, along with published formation-damage tests for several other cleanout fluids, 16 are presented in Fig. 9 in terms of return formation permeability after each cleanout system was pumped through formation samples.…”

Section: -Solids Transport Length -Test Datamentioning

confidence: 99%

An Integrated System Approach to Wellbore Cleanouts With Coiled Tubing

et al. 2004

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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 development of new tools and techniques, a new, highly engineered and integrated system for wellbore cleanouts was developed. This paper presents the new integrated system approach, which can eliminate wellbore fill-removal problems and provide effective wellbore cleanouts under virtually any wellbore conditions. Case studies are included that show the performance of the new system in difficult field environments.

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Section: -Solids Transport Length -Test Datamentioning

confidence: 99%

An Integrated System Approach to Wellbore Cleanouts With Coiled Tubing

et al. 2004

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“…24 The objectives of this paper are to review the performance of VES in various applications and discuss their performance based on field data.…”

Section: Spe 84898mentioning

confidence: 99%

Application of a New Class of Surfactants in Stimulation Treatments

Nasr‐El‐Din

Samuel

2003

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TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractDifferent acid systems have been used to stimulate production and injection wells for more than a century. Several chemicals are added to the acid to enhance the efficiency of the acidizing treatments, including various types of surfactants.Surfactants play a key role in many well treatments because of their unique properties. Surfactants are used to reduce surface tension, change wettability, mobilize residual oil, and disperse corrosion inhibitors. They are also used as anti-sludge agents, emulsifiers in acid-oil emulsions, and demulsifiers. This wide spectrum of applications is due to the ability of surfactants to adsorb on various surfaces and associate in the bulk of solutions and form micellar structures. The properties of surfactants depend on the size of the head, tail length, and configuration of the tail, surface charges, ionic strength and temperature.Recent advances in surfactant technology have introduced a new class of surfactants with special characteristics useful in oilfield applications. This new class of surfactant has the ability to form viscoelastic systems, which can be used to increase viscosity of the treating fluids, without causing formation damage. These surfactants have been used in Saudi Arabian fields to enhance diversion during matrix acid stimulation, reduce leak-off during acid fracturing and to minimize losses (well control) during workover. The system proved successful to provide fracture extensions in acid fracturing applications of low temperature seawater injectors and high temperature gas wells. These surfactant systems are non-damaging and do not require sized solids to control losses, which eliminates the need for remedial acid treatments.

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“…Viscoelastic surfactant technology has also been used in the selective stimulation of high water cut wells. 7 After five years of successful use of VES systems in hydraulic fracturing, its use is now extended to many applications including diversion, 8-10 matrix stimulation, [11][12][13] sand control, 15 acid fracturing, 16,17 fluid-loss control 18 and coiled tubing cleanout. 19…”

Section: Introductionmentioning

confidence: 99%

A Novel Fluid-Loss Control Pill That Works Without Filter-Cake Formation: Applications in High-Rate Gas Subsea Frac-Pack Completions in Indonesia

et al. 2006

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TX 75083-3836 U.S.A., fax 01-972-952-9435. AbstractLoss of completion fluid during a completion or work over operation not only increases the chance of losing control of the well, but also can severely damage the formation. The best industry recognized method to stop fluid losses into the formation is to use mechanical fluid loss control devices. However, sometimes, the use of mechanical fluid loss control device is not applicable. Two examples where fluid loss control devices are not applicable are (1) Shoot and Pull Tubing Conveyed Perforating (TCP) before a gravel pack or a frac pack, and (2) Single trip perforating and gravel pack or frac pack completions. In these cases the use of fluid loss control pills is necessary. Traditional fluid loss control pills are associated with formation damage, clean up trips and annular pack plugging. This paper presents the application of a Viscoelastic Surfactantbased non-damaging lost circulation pill (VES-PILL) during the completion of sub-sea gas wells in the South China Sea for ConocoPhillips.This novel solids-free fluidloss control pill was applied to insure well control after perforating and before frac packing. This paper describes the cases from the two wells of which one was completed as a single trip multi-zone frac and pack completion and the other as commingled stack frac packs. These commingled stack frac packs consisted of multi-zone frac packs and gravel pack on bottom and a conventional frac pack on top. Both single trip completions considerably exceeded the world record for the longest single trip gravel packed completion. In the first well, well control was achieved and the losses were controlled from 322 bph to 8 bph. In the second application, during a traditional shoot and pull, the losses were controlled from 60 bph to 0 bph. After completion, the wells were tested at 87 and 55 MMSCFD at 400 psi WHP, and were found to exceed pre-drilling production estimates by about 17-24%. This further confirms the non-damaging property of this VES-PILL.

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Laboratory Investigation and Field Use of a Novel Sand Cleanout Fluid System for High Temperature Applications

Cited by 6 publications

References 12 publications

An Integrated System Approach to Wellbore Cleanouts With Coiled Tubing

An Integrated System Approach to Wellbore Cleanouts With Coiled Tubing

Application of a New Class of Surfactants in Stimulation Treatments

A Novel Fluid-Loss Control Pill That Works Without Filter-Cake Formation: Applications in High-Rate Gas Subsea Frac-Pack Completions in Indonesia

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