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Keywords: precipitation
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Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174277-MS
... precipitated salt and technological properties of the reagent, including the inhibitory activity, the state of aggregation, compatibility with formation water, corrosivity, lack of effect on the preparation of oil and thermal stability ( Tomson et al. 2003 ). A disadvantage of scale inhibitors in liquid form...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174279-MS
... The laboratory evaluation was designed to be consistent with the preliminary formation damage diagnosis. Fluid chemical samples were first analysed and compatibility tests carried out to generate the similar emulsion or precipitate that were observed in the field. Thereafter, potential...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174222-MS
... redistribution of cement (Fe/P-rich dolomite) and dissolution, precipitation and mobilization of a Fe/Ca-P complex. In order to mitigate the injectivity issues highlighted, a part-neutralized formulation of chemical C1 (C1*) was prepared. The C1* formulation was tested on fresh BT(A2) reservoir core material...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference and Exhibition, June 3–5, 2015
Paper Number: SPE-174235-MS
... totally neglected in all of thermodynamic modelling work which is based on the fundamental assumption that the potential scale precipitation will be due to pure mixing of formation and injected water in the production well. However, it has been reported in some recent publications that both of brine...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165157-MS
... important types of inorganic scales that can be observed in majority of reservoirs which encounter scaling problem during water injection.[ 8 – 9 – 10 – 11 ] Precipitation of these scales may ends to dramatic permeability reduction during water injection and due to their relative hardness and low solubility...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165109-MS
... Abstract Precipitation, deposition and gelling of paraffins are common production chemistry challenges associated with upstream exploration and production. In this paper the different steps used to identify the wax-related issues from project to start-up and steady state are discussed. The...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165158-MS
... particles get precipitated in the reservoir away from the injection well, plugging the pores and reducing the formation permeability. From the simulation result on the effect of reservoir depth and temperature, we found that deep oil and gas reservoirs are good candidates for CO 2 sequestration than...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165084-MS
... To avoid these precipitations, a preflush of ammonium chlorite brine is used ahead of the HF acid stage to displace the formation brine. In addition, sodium-based additives should not be used with HF-based acids. Mungan (1989) states that clay damage depends on (1) the type and the amount...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165149-MS
... identify precipitates from reaction products. Inductively coupled plasma (ICP) was applied to measure iron concentration, and the two-phase titration method was used to determine VES concentration in all phases of the sample. The effect of several chelating agents on the reaction of VES with Fe (III) was...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165147-MS
... precipitation and secondary precipitation. In this study, a new sandstone acid formulation was developed that can be used as a single stage sandstone acid system. This system eliminates the requirement of preflush and postflush HCl acid stages, reduces the treatment complexity, reduces the HCl requirements, and...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference & Exhibition, June 5–7, 2013
Paper Number: SPE-165142-MS
... Abstract Significant advances in acidizing chemistry have led to the introduction of sequestering agents, such as hydroxypolycarboxylic acids, followed by chelating agents, to mitigate precipitation reactions. The initiative to obtain fluids with an improved environmental footprint has led to...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-143155-MS
... chemicals and reservoir components. Formation brines that have high concentrations of Ca 2+ and Mg 2+ can interact with injected fluid and cause precipitation and loss of injectivity. Operators during some ASP field studies have noticed negative interactions between injected chemicals with formation rock...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-143788-MS
..., most commonly in the form of ammonium bifluoride. The HF acid greatly increases the dissolution of aluminosilicates, while the chelant prevents the precipitation of silica gel. The addition of boric acid effectively retard the dissolution rate of the fluid as boric acid the reacts with the HF acid to...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-143855-MS
... Abstract In offshore operations where seawater is commonly used to prepare hydrochloric acid, calcium sulfate precipitation, the potential of which can greatly reduce the effectiveness of these treatments. This is because high concentreation of calcium produced in spent acid mixed with high...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-144007-MS
... Precipitation of insoluble reaction products during acid treatments of injection wells has long been known. The formation of different precipitations such as iron hydroxide and calcium sulfate affects the treatment outcome and can decrease the well injectivity. This decrease is mainly due to the...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-144047-MS
... water quality associated with discharge to sea. In response to this, Statoil have investigated different methods of retaining sand downhole by chemical sand consolidation, of which in situ calcium carbonate precipitation will form the basis for the paper. This technology involves squeezing into the near...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-144100-MS
... ability of different organic acids is one of the main factors which govern the precipitation of aluminum fluoride, as will be disscussed later. Although field applications have shown that organic-HF mixtures can be effective sandstone stimulation fluids, however, there is a lack in deep understanding...
Proceedings Papers

Paper presented at the SPE European Formation Damage Conference, June 7–10, 2011
Paper Number: SPE-144179-MS
... were studied. Atomic absorption was used to measure manganese concentrations and X-ray diffraction to analyze solids remaining after the reaction. White precipitate of manganese citrate was produced following the reaction of citric acid with Mn 3 O 4 up to temperatures of 284°F. The amount of...
Proceedings Papers

Paper presented at the 8th European Formation Damage Conference, May 27–29, 2009
Paper Number: SPE-120988-MS
... Abstract This paper describes the study of the effect of asphaltene precipitation and deposition on the development of the Marrat field using a compositional simulation model with asphaltene modeling facilities. The model enables the simulation of asphaltene precipitation, flocculation, and...
Proceedings Papers

Paper presented at the 8th European Formation Damage Conference, May 27–29, 2009
Paper Number: SPE-122140-MS
... Modeling & Simulation flow in porous media Upstream Oil & Gas precipitation pressure drop precipitate relation water saturation concentration experiment evaporation rate presentation Fluid Dynamics evaporation sand pack gas velocity ctscan saturation equation NaCl...

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