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Keywords: enzyme
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Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 19–21, 2020
Paper Number: SPE-199271-MS
... mudcake and polymer gel, was used for wellbore cleanup with very encouraging results. In addition, the chemical is also an eco-friendly, noncorrosive bio-enzyme and is naturally biodegradable. The chemical disintegrates into its natural elements (carbon, hydrogen, oxygen and nitrogen) after converting the...
Proceedings Papers

Paper presented at the SPE International Conference and Exhibition on Formation Damage Control, February 19–21, 2020
Paper Number: SPE-199260-MS
... enzyme package designed to degrade xanthan was included in the revised breaker solution and an improvement in injectivity was recorded. Further adjustments were made to the breaker formulation to optimize performance for density range, corrosion mitigation and dissolution of calcium carbonate, including...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2012
Paper Number: SPE-151683-MS
... drilling operation. Adoption of the new formulation has facilitated a simpler, faster displacement operation and made it easier to test various techniques that are offered for filtercake clean up. Treatments, involving acetic acid released in situ, enzymes, sequestering agents, etc., provided questionable...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 10–12, 2010
Paper Number: SPE-127936-MS
... Figure 1 Growth curve for the fermentation and production of the new enzyme. The production of enzyme was visualized by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) in the method of Laemmli. 8 A volume of enzyme sample combined with an equal part of SDS...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 13–15, 2008
Paper Number: SPE-112292-MS
... component selection, brine evaluation, hydrate suppression measurement, elastomers compatibility, extensive breaker treatment studies, formation damage measurements using actual reservoir core and long term corrosion testing. An in-situ generating acid/enzyme breaker treatment deployed in the gravel pack...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 13–15, 2008
Paper Number: SPE-112355-MS
... permeability higher than 1µm2. Finally some results on the behaviour of its application in heavy oil reservoir are presented. Introduction At present, treatment of oil and gas wells with chemicals and biological enzymes are widely practiced to stimulate the production rate of the wells (Harold, 2003, McRae...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 13–15, 2008
Paper Number: SPE-112427-MS
... sandstone reservoir (310°F). Various cleaning fluids were proposed to remove drilling mud filter cake; including: solids-free formate brine, formate brine doped with organic acids (acetic, formic, citric, and lactic acids), and enzymes. The main objective of this paper is to assess the effectiveness of...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 15–17, 2006
Paper Number: SPE-98300-MS
... chemical techniques (oxidizers, enzymes and acids) are available to break the polymers and dissolve CaCO3 particles that are present in the filter cake. The limitations of these fluids are fast reaction rates and corrosiveness provided by acids, especially at high temperatures. Also, cleaning fluids are...
Proceedings Papers

Paper presented at the SPE International Symposium and Exhibition on Formation Damage Control, February 18–20, 2004
Paper Number: SPE-86510-MS
.... The performance of enzymes utilized in low temperature cleanup treatments. gravelpack breakthrough time drilling fluids and materials rdf filtercake drilling operation drilling fluid selection and formulation enzyme lubricant upstream oil & gas rdf formulation completion...
Proceedings Papers

Paper presented at the International Symposium and Exhibition on Formation Damage Control, February 20–21, 2002
Paper Number: SPE-73792-MS
... mud. drilling fluid formulation degradation drilling mud polymer drilling fluid selection and formulation spe 73792 upstream oil & gas average loss biological control formation damage slawomir falkowicz effectiveness concentration enzyme experiment drilling fluid chemistry...
Proceedings Papers

Paper presented at the SPE International Symposium on Formation Damage Control, February 23–24, 2000
Paper Number: SPE-58749-MS
... Abstract The use of enzymes as an external breaker for removal of xanthan based filter cakes has exhibited cost savings and effective clean up in several open-hole horizontal Gulf Coast wells. Enzymes are specialized proteins produced by cells of living organisms. They act as catalysts to...
Proceedings Papers

Paper presented at the SPE International Symposium on Formation Damage Control, February 23–24, 2000
Paper Number: SPE-58732-MS
.... Results of these laboratory studies as well as case histories will be presented to illustrate the benefit of using Polymer Specific Enzymes 1 (PSE) to reduce drill-in fluid damage in horizontal wells where slotted liner type completions are used. Introduction The Kuparuk Field lies adjacent to the...
Proceedings Papers

Paper presented at the SPE International Symposium on Formation Damage Control, February 23–24, 2000
Paper Number: SPE-58740-MS
... recent field test, a new technique was applied to remove the drill-in fluid filter cake in a North Sea horizontal well fitted with a sand control screen. This technique uses an EDTA/ascorbic acid/enzyme mixture to effectively remove calcium carbonate and polymer filter cake. The treating fluid was...
Proceedings Papers

Paper presented at the SPE International Symposium on Formation Damage Control, February 23–24, 2000
Paper Number: SPE-58785-MS
... control completion drilling fluid chemistry cleanup filter cake enzyme spe 58785 time scale drilling fluid selection and formulation breaker solution upstream oil & gas drilling operation completion drilling fluids and materials gravel packing sand control Copyright 2000, Society of...
Proceedings Papers

Paper presented at the SPE International Symposium on Formation Damage Control, February 23–24, 2000
Paper Number: SPE-58768-MS
... Abstract Polymer-specific and starch specific-enzymes were evaluated for use as breakers for biopolymer/starch-based drill-in fluids. Various combinations of drill-in fluid components were also tested to determine the optimum system that would enhance enzyme(s) performance. In the first half...
Proceedings Papers

Paper presented at the SPE Formation Damage Control Conference, February 18–19, 1998
Paper Number: SPE-39439-MS
.../or breaker type to give maximum productivity in a horizontal, non perforated open hole completion. The effectiveness of hydrochloric acid, oxidizing agents, and enzyme breaker in increasing the mud cake and formation permeability was investigated by targeting specific mud components in the mud cake...
Proceedings Papers

Paper presented at the SPE Formation Damage Control Symposium, February 14–15, 1996
Paper Number: SPE-31084-MS
... Abstract This paper describes laboratory experiments demonstrating that the use of polymer linkage specific enzymes is effective in breaking the starch polymer constituent of sized salt fluid loss control materials (FLCMs). It is further demonstrated that the linkage specific enzymes are...
Proceedings Papers

Paper presented at the SPE Formation Damage Control Symposium, February 7–10, 1994
Paper Number: SPE-27366-MS
... is presented below. In this paper, we will review fundamentals on cellulose chemistry and cellulose quality as related to the manufacturing of HEC polymer, the formation of "fish-eyes" and "micro- gels" and the degradation mechanisms of HEC gels by temperature, acids, bleach, and enzymes. Finally, we...
Proceedings Papers

Paper presented at the SPE Formation Damage Control Symposium, March 24–25, 1982
Paper Number: SPE-10658-MS
... polymer: breaker type, breaker concentration, break time, and break temperature. The type of breaker used to degrade a polymer (i.e., acid, enzyme, oxidizer) is very important. Since each breaker type operates under a different mechanism to degrade the polymer, there is a different set of factors...

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