Impact of Synthetic-Based Drilling Fluids on Oilwell Cementing Operations

Patel, Anjali; Wilson, J. Michael; Loughridge, B. W.

doi:10.2118/50726-ms

Cited by 17 publications

(8 citation statements)

References 14 publications

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“…After the drilling operation and during the completion stage, and afterwards, the emulsion can be reversed by an addition of water-soluble acid, providing excellent filtercake cleanups, improve production in the openhole completion, better cementing, 9 and efficient cuttings cleanup and waste minimization. The reversible feature allows the drilling fluid to achieve drilling performance, optimum completion of a well, minimal environmental impact, and cost control.…”

Section: Reversible Invert Emulsions Drilling Fluidsmentioning

confidence: 99%

New Opportunities for the Drilling Industry Through Innovative Emulsifier Chemistry

Patel¹,

Ali

2003

International Symposium on Oilfield Chemistry

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractAs the drilling industry operates in more stringent environmental constraints and conservative economical environment, the industry is poised to take advantage of innovative emulsifiers for new opportunities in solving the environmental problems and offer economical advantages over conventional invert emulsion drilling fluids. We have developed various innovative invert emulsion drilling fluids using novel emulsifiers. These systems provide a quantum leap in new drilling fluid technology in solving environmental problems while offering economical advantages over conventional invert emulsion drilling fluids.Since, the inception of invert emulsion drilling fluids decades ago, emulsifier technology for these systems has not advanced much. The focal points in development in past history have been in base fluids, O/W ratios and some in weight materials, however very little has been changed in emulsifier chemistry. Only step-changes in technology have been achieved with changes in base-fluids and other parameters of invert emulsion drilling fluids. It is time to move on. Using innovative emulsifier chemistry has produced novel invert emulsion fluids, which address the environmental as well as performance and cost-related issues in drilling operations.This paper discusses the systematic design, development and testing of novel emulsifiers for innovative invert emulsion drilling fluids. The overall impact of manipulation of emulsifier chemistry in invert emulsion drilling fluids to meet the environmental and functional requirements of drilling operation is presented. The formulations and applications of lime-free high temperature invert emulsion drilling fluid, negative alkalinity ester-based fluid, and reversible invert emulsion drilling fluids in laboratory experiments as well as field trials are highlighted.

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Section: Reversible Invert Emulsions Drilling Fluidsmentioning

confidence: 99%

New Opportunities for the Drilling Industry Through Innovative Emulsifier Chemistry

Patel¹,

Ali

2003

International Symposium on Oilfield Chemistry

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“…The cement bond to an oil-wet surface is significantly weaker than that to a water-wet or dry surface. 13 If the oil-wet surfaces of the drillstring, casing, and formation are made water-wet using a reversible mud system, the cement bond can be improved, and zonal isolation can be carried out with fewer problems.…”

Section: Cementingmentioning

confidence: 99%

“…The oil-wetting surfactants used in invert emulsion drilling fluids are thought to be responsible for oil-wetting the formation. 13 Under most conditions, conventional OBMs make excellent fluids for drilling through productive intervals. However, conventional OBMs can not readily be cleaned up.…”

Section: Drill-in Fluid Optimization: Application Acidizing and Filtmentioning

confidence: 99%

Reversible Invert Emulsion Drilling Fluids: Controlling Wettability and Minimizing Formation Damage

Patel¹,

Growcock²

1999

Proceedings of SPE European Formation Damage Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractNovel emulsifiers in reversible invert emulsion drilling fluids offer a unique opportunity for operators to control the wettability properties of the mud. Reversibility of the invert emulsion will provide economic advantages in drilling and completion and increased productivity. Optimal drilling performance and formation damage control are usually achievable by oil wetting the drill solids, formation and drillstring. On the other hand, optimal completion of a wellfiltercake removal and cement bonding --and disposal of drilled cuttings are best achieved by maintaining all surfaces water-wet. Filtercake removal is especially critical in the completion of horizontal openhole wells.The reversible invert emulsion drilling fluids can be readily and reversibly converted from a water-in-oil emulsion to an oil-in-water emulsion and back to a water-in-oil emulsion using an acid-base chemical switch. This drilling fluid system is simple and easy to run without any drastic changes in current invert-emulsion technology. A novel surfactant package forms an invert emulsion in the presence of lime and a direct emulsion in the presence of acid. Reversible emulsion technology uses new emulsifiers that allow the drilling fluid to cycle between oil-wetting and water-wetting as frequently as one desires. Protonation and deprotonation of the surfactant is used to control the emulsion phase without drastic and uncontrollable viscosity swings.The reversible invert emulsion drilling fluid has been successfully run in a North Sea well. The paper presents field data illustrating the economic benefits of this system and discussion on how the ability to change wettability can influence drilling and completion performance.

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“…The success of any drilling project depends on the compatibility of drilling fluid with the spacer and oil well cement [3,[12][13][14][15][16][17]. Due to the oil-wetting characteristics of OBF, displacing OBF becomes a critical operation before cementing.…”

Section: Introductionmentioning

confidence: 99%

A Review of Recent Research on Contamination of Oil Well Cement with Oil-based Drilling Fluid and the Need of New and Accurate Correlations

Arbad

Teodoriu

2020

ChemEngineering

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Drilling fluids and oil well cement are important well barriers. Their compatibility affects the long-term integrity of the well. The mixing of drilling fluid with the oil well cement causes contamination of oil well cement. If the contamination is due to diesel/oil-based drilling fluid (OBF) it adversely affects the rheological and mechanical properties of oil well cement—in other words, the long-term integrity of the well. An initial study on OBF contamination of oil well cement was carried out two decades ago. In recent years, several research projects were carried out on the same topic to understand the reason for changes in the properties of oil well cement with OBF contamination. This literature review shows that using OBF eliminates several drilling problems, as the long-term integrity of the well depends on the amount of OBF contamination in the cement slurry. This paper compares the experiments performed, results and conclusions drawn from selected research studies on OBF contamination of oil well cement. Their shortcomings and a way forward are discussed in detail. A critical review of these research studies highlights the need for new and accurate correlations for OBF-contaminated oil well cement to predict the long-term integrity of wells.

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Impact of Synthetic-Based Drilling Fluids on Oilwell Cementing Operations

Abstract: This paper was prepared for presentation at the 1999 International Symposium on Oilfield Chemistry held in Houston, Texas, 16-19 February.

Cited by 17 publications

References 14 publications

New Opportunities for the Drilling Industry Through Innovative Emulsifier Chemistry

New Opportunities for the Drilling Industry Through Innovative Emulsifier Chemistry

Reversible Invert Emulsion Drilling Fluids: Controlling Wettability and Minimizing Formation Damage

A Review of Recent Research on Contamination of Oil Well Cement with Oil-based Drilling Fluid and the Need of New and Accurate Correlations

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