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Keywords: precipitate
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Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Chemistry, April 8–9, 2019
Paper Number: SPE-193551-MS
... the retarded HCl acid recipes were effective to stimulate carbonate reservoirs. Compatibility testing showed presence of significant white precipitate. ESEM analysis showed the precipitates were rod-like crystals composed of mainly of Cl and high C with small amounts of N, O, Al and Mg. TGA results...
Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Chemistry, April 8–9, 2019
Paper Number: SPE-193621-MS
... HTGC method for carbon chain analysis. Upon analysis, components present in the sample were found to exceed the solidity limits of the carrier system, carbon disulfide (CS 2 ) and would precipitate out of the solution and form a two-phased system. These components were believed to be higher molecular...
Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Chemistry, April 8–9, 2019
Paper Number: SPE-193635-MS
... Abstract Scale inhibitor (SI) squeeze treatments in carbonate reservoirs are often affected by the chemical reactivity between the SI and the carbonate mineral substrate. This chemical interaction may lead to a controlled precipitation of the SI through the formation of a sparingly soluble Ca...
Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Chemistry, April 3–5, 2017
Paper Number: SPE-184511-MS
... incompatible waters in production flow systems, for example formation brine and sea water injected for maintaining downhole pressure, or changing the reservoir conditions, i.e. temperature, pressure, brine pH etc. Scale, precipitated on downhole equipment, pipes and production tubulars and within the formation...
Proceedings Papers

Paper presented at the SPE International Conference on Oilfield Chemistry, April 3–5, 2017
Paper Number: SPE-184534-MS
...) based on the tube blocking method were determined for each inhibitor at 160 °F. Scale precipitates from the bottle tests were also characterized for morphology and polymorphs using environmental scanning electron and X-ray diffraction (XRD) techniques. Obtained results showed significant reductions in...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 13–15, 2015
Paper Number: SPE-173770-MS
... scale remediation Production Chemistry Upstream Oil & Gas concentration scale inhibitor precipitate fe 3 molar ratio nucleation Dtpmp inhibition efficiency dtpmp performance edta experimental condition apparatus phosphonate citric acid polymeric scale inhibitor detrimental effect...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 13–15, 2015
Paper Number: SPE-173771-MS
... inhibitor chemical scale remediation Production Chemistry Upstream Oil & Gas sulphide scale precipitate turbidity environmentally acceptable inhibitor turbidity measurement sem image The formation of mineral scale is a persistent and expensive problem. Scaling of metallic or insulating...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 13–15, 2015
Paper Number: SPE-173769-MS
... of interactions between scale inhibitors and shale and sandstone minerals. In this study, adsorption and precipitation of a phosphonate scale inhibitor – DTPMP on shale minerals were investigated at 70°C. Equilibrium adsorption isotherms were determined for various inhibitor concentrations at...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 8–10, 2013
Paper Number: SPE-164050-MS
... – – 395.4 77.6 Na, mg/l – – – 57.2 Fig. 22 SEM photo of precipitate in the spent acid solution after regular strength sandstone acid reaction with chlorite for 5 hours at 150°C Fig. 23 Elemental analysis of precipitate in the spent acid solution after regular strength...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 8–10, 2013
Paper Number: SPE-164110-MS
.... and a length of 6 in. Samples of the reacted fluid were collected periodically and calcium and iron concentrations were measured using Inductively-Coupled Plasma, and used to determine the acid-rock reaction rate and to study the possibility of precipitation. For the phosphorus-based acid...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 8–10, 2013
Paper Number: SPE-164123-MS
... Table 1 Crude heavy oil properties Temperature (°C) Viscosity (Cp) Density (g/cm³) 25 87651 Not measured 40 13298 0.9959 70 1450 0.9774 Table 2 Elementary analysis of the crude of sample and asphaltene precipitate with n- heptane Elementary composition...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 11–13, 2011
Paper Number: SPE-140177-MS
... producing oil or gas well formation ( Tomson et al ., 2004 ). It is often called a precipitation mechanism when an acidic phosphonate inhibitor is injected into a carbonate formation to cause the precipitation of calcium phosphonate and the following dissolution of phosphonate precipitate during flowback...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 20–22, 2009
Paper Number: SPE-121552-MS
... of oil or gas equivalent. These brines are corrosive and tend to produce calcite or sulfate scales [1]. Along with other forms of scales, calcite (calcium carbonate) is the most common type of scale deposits formed in the oil industry. According to Tomson et al [2], precipitation of calcite in...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 20–22, 2009
Paper Number: SPE-121633-MS
... acids with minor traces of lower molecular weight species. Results from this work have now shed more light on the naphthenic acid composition in different field calcium naphthenates, which has been a topic of debate for some time. Results are also presented from novel re-precipitation experiments using...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 20–22, 2009
Paper Number: SPE-121553-MS
... significantly affect the solubility of calcium carbonate. This might be due to increasing the stability of ferrous iron carbonate complexes in the presence of calcium. Also the molar ratios of calcium to iron in the solution were compared with their molar ratios in the precipitated salts solid. It was found...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 20–22, 2009
Paper Number: SPE-121563-MS
...–1.3). The phase behavior of these various calcium sulfate phases were monitored by X ray diffraction. The inhibition study was done by evaluating the inhibition efficiency of calcium sulfate precipitation at the same supersaturation and temperature ranges as the nucleation study. Several...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 20–22, 2009
Paper Number: SPE-121709-MS
... wt%. A mole of GLDA acid with a natural ~ pH 1.6 is capable of dissolving up to two moles of CaCO3. Throughout the pH range GLDA appears to be as thermally stable as HEDTA. As an additive to HCl, GLDA is as effective as HEDTA in preventing precipitation of moderate levels of Fe in spent acids. At...
Proceedings Papers

Paper presented at the SPE International Symposium on Oilfield Chemistry, April 20–22, 2009
Paper Number: SPE-121716-MS
... Abstract Surfactant-based acid systems were developed over the last few years for diversion to overcome the severe problems caused by polymer residue and crosslinker precipitate after polymer-based system treatments during matrix and fracture acidizing. Two main types of viscoelastic...
Proceedings Papers

Paper presented at the International Symposium on Oilfield Chemistry, February 28–March 2, 2007
Paper Number: SPE-106442-MS
... Abstract In treating sour, water injectors in carbonate formations in Saudi Arabia, sulfide scavenging, prevention of sulfur and iron sulfide precipitation is a major requirement during acidizing treatments. As the acid spends on the carbonate surfaces, and in the presence of ferric iron in...
Proceedings Papers

Paper presented at the International Symposium on Oilfield Chemistry, February 28–March 2, 2007
Paper Number: SPE-105505-MS
... concentration experiment ampoule international symposium Upstream Oil & Gas Brine scale inhibitor oxygen scavenger degradation remediation of hydrates desorption phase precipitate scale inhibition molecule scale-up time performance test degradation process application calcium squeeze...

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