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• W4230456838 abstract "Development of a Set Retarder for Foamed Cement Applications J. Chatterji; J. Chatterji Halliburton Search for other works by this author on: This Site Google Scholar R.J. Crook; R.J. Crook Halliburton Search for other works by this author on: This Site Google Scholar S.E. Lebo, Jr.; S.E. Lebo, Jr. Borregaard Lignotech Search for other works by this author on: This Site Google Scholar S.L. Resch S.L. Resch Borregaard Lignotech Search for other works by this author on: This Site Google Scholar Paper presented at the International Symposium on Oilfield Chemistry, Houston, Texas, February 2003. Paper Number: SPE-80244-MS https://doi.org/10.2118/80244-MS Published: February 05 2003 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Chatterji, J., Crook, R.J., Lebo, S.E., and S.L. Resch. Development of a Set Retarder for Foamed Cement Applications. Paper presented at the International Symposium on Oilfield Chemistry, Houston, Texas, February 2003. doi: https://doi.org/10.2118/80244-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Conference on Oilfield Chemistry Search Advanced Search AbstractDue to a recent resurgence in foamed cement utilization, there is a need for an additive that can provide adequate set retardation without affecting the foam characteristics of the cement system. This paper details the development of a foamed cement retarder comprising a blend of lignosulfonate, kraft lignin and a pentose sugar. Laboratory studies have shown that the performance of this product exceeds that of conventional set retarders with regard to maintaining the stability of the foamed cement system. This set retarder can also function in non-foamed applications. Several wells have been successfully completed using this new technology and case histories will be provided.IntroductionFoamed cement compositions are often used in cementing casing and liners in subterranean zones penetrated by well bores. These compositions offer the advantage of being lightweight to help prevent fracture of the formation caused by the excessive hydrostatic pressure that can be associated with conventional cement systems. Additionally, the compressed gas contained within a foamed cement slurry helps improve its ability to maintain constant pressure; thus, helping to prevent the influx of formation fluid into the cement system during the transition period when the cement goes from a fluid to a set state. In addition, foamed cement slurries are two-phase fluids, they impart excellent filtrate loss control.1When foamed cement compositions are used to isolate deep hot subterranean zones, a set retarder can be used to prevent premature thickening or hardening of the slurry before its placement in the zone to be cemented. Conventional set retarders such as lignosulfonates, hydroxycarboxylic acids and acrylic acid/2-acrylamido-2-methyl propane sulfonic acid retarders copolymers2 and maleic anhydride/2-acrylamido-2-methyl propane sulfonic acid copolymers,3 have proven ineffective in foamed cement applications. These have a tendency to disperse the slurry, thereby destabilizing the foamed character of the system. Cellulosic derivatives such as hydroxyethylcellulose (HEC) or carboxymethylhydroxyethylcellulose (CMHEC) are used as set retarders in foamed cement systems. The high concentrations of CMHEC required to achieve adequate retardation at elevated temperatures caused the foamed compositions to have unacceptably high viscosities. In addition, the retardation properties of CMHEC are limited to a bottomhole circulating temperature of 220°F. Consequently, the need for a new additive for retarding the set of foamed cement systems has become apparent.Product DevelopmentThe first step in the developmental process involved devising a method for screening a large number of potential candidates quickly and easily. Since the most important criteria a successful candidate needed to possess was maintenance of foam stability within the cement system, a simple foam stability test was developed. Preparation of the foamed cement slurry involved a two-step mixing process. Phase one involved preparation of a base cement slurry consisting of Portland Class H cement, 35% finely ground crystalline silica by weight of Portland cement (BWOC), 19.15 % iron oxide weighting agent BWOC, 0.1% hydroxypropyl guar suspending agent BWOC and 2% of each foamed cement retarder candidate BWOC mixed in a two-liter Waring blender. Once the base slurry was produced, a known weight of base slurry was added to a foam generator. The foam generator consisted of a one-liter sealable mixing container with a stacked array of five mixing blades. The weight of base slurry added to the foam generator was dependent upon the initial density of the base slurry and the target density of the final foamed cement slurry. A foaming surfactant containing a foam stabilizing surfactant mixture comprised of ethoxylated alcohol ether sulfate, cocoylamidopropylbetaine and cocoylamidopropyldimethylamine-oxide4 was then added to the multibladed mixing container in an amount of 0.8 to 2.0% by weight of water (BWOW). After the required amount of base slurry and foaming agent had been added to the mixer, the slurry was subjected to maximum shear on a Chandler constant speed mixer until the foamed slurry completely filled the mixing container. Mixing time was an important parameter during the foaming phase and a maximum mixing time of 10 seconds was established. Keywords: foamed slurry, cement slurry, foamed cement application, lignosulfonate, cement property, slurry, cement chemistry, spe 80244, foamed cement system, kraft lignin Subjects: Casing and Cementing, Cement formulation (chemistry, properties) This content is only available via PDF. 2003. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4230456838 title " Development of a Set Retarder for Foamed Cement Applications " @default.
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