Enhancing the permeability of a carbonate rock core by dissolution/precipitation treatment with organophosphorus additives evaluated by SEM/EDS and ICP-OES

Cardoso, Giuseppe Sampaio Almeida; Freitas, Tiago Cavalcante; Rosário, F.F.; Cajaiba, João

doi:10.1016/j.petrol.2020.107341

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…Oxidant and/or extra power were heavily consumed in the direct oxidation of EDTA. 22,46,47 Even though diethyldithiocarbamate and/or organophosphorus precipitant showed efficiency in the precipitation of heavy metals in electroplating wastewater, 48,49 the overdosage of such precipitant is necessary to increase the precipitant concentration for the competition precipitation of heavy metals with EDTA. Herein, the prepared char had plenty of amido/thiol groups for the adsorption of Cu and Ni in competition with EDTA and can be regenerated several times, which not only saved the excess of overdosed precipitant but also recycled value-added heavy metals.…”

Section: Environmental Science: Water Research and Technology Papermentioning

confidence: 99%

Transformation of oil scum as magnetic char for effective recovery of Cu and Ni from EDTA-bearing wastewater

Guo²,

Hong

et al. 2023

Environ. Sci.: Water Res. Technol.

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Section: Environmental Science: Water Research and Technology Papermentioning

confidence: 99%

Transformation of oil scum as magnetic char for effective recovery of Cu and Ni from EDTA-bearing wastewater

Guo²,

Hong

et al. 2023

Environ. Sci.: Water Res. Technol.

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“…Phosphonates are a common type of SI used in the oil and gas industry . They can be applied through various methods, including squeeze treatments . As a result of the strong adsorption onto minerals, phosphonate-based squeeze treatments often have a long lifespan, with inhibition lasting for several months to a year or more before the need to resqueeze the well …”

Section: Introductionmentioning

confidence: 99%

“…10 They can be applied through various methods, including squeeze treatments. 11 several months to a year or more before the need to resqueeze the well. 12 I t i s w e l l -k n o w n t h a t a l k y l d i a m i n e − t e t r a k i s -(methylenephosphonic acid)s of the general type (H 2 O 3 PCH 2 ) 2 N(CH 2 ) n N(CH 2 PO 3 H 2 ) 2 are highly effective SIs used in the oil and gas industry for the inhibition of inorganic scales.…”

Section: Introductionmentioning

confidence: 99%

Flexible, Linear, and Systematically Expanded Tetraphosphonate Bolaamphiphiles and Their Inhibition Performance against Calcite and Barite Scale Formation

et al. 2023

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Oilfield scaling is one of the most prevalent water-based oilfield production problems. Chemical inhibitors are often used to combat and prevent scale deposition. The phosphonate functional group is commonly used in many scale inhibitors. A series of bolaamphiphilic alkyldiamine tetrakis(methylenephosphonic acid)s have been synthesized from 1,X-diamines, where X in the polymethylene spacer groups has an even number of 2–12 carbon atoms. These inhibitors were coined CX-T (X is the number of C atoms between the N atoms on the inhibitor backbone, and T stands for tetraphosphonates). All tetraphosphonates showed excellent compatibility with calcium ions at 100 ppm or less, i.e., normal scale inhibitor dosage levels. At higher dosages, the calcium concentration and length of the alkylene spacer chain between the nitrogen atoms also determine the compatibility. Crystal structures were determined for the calcium “complexes” with the tetraphosphonates C2-T, C4-T, C6-T, and C8-T. All tetraphosphonates were investigated for calcite and barite scale inhibition under dynamic conditions using oilfield produced waters based on the Heidrun field water composition, offshore Norway. For calcite scaling, tetraphosphonates with ethylene (2 carbons) and hexamethylene (6 carbons) spacer groups gave the best inhibition performance. For barite scaling, the best inhibition was observed for the tetraphosphonates with ethylene and tetramethylene spacer groups, which relates to the ability of both disphosphonate moieties to interact with a single barium ion.

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Study on the Performance Degradation of Sandstone under Acidification

Shi

2020

ACS Omega

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In most oilfields, acid fracturing is widely used for oil production. Understanding the relationship between the individual factors (i.e., carbonate rock types, acid rock reaction kinetics, and deterioration of rock mechanical properties) can provide practical guidelines that can be used for the design and optimization of acid fracturing operation. This paper takes hydrochloric acid, acetic acid, and citric acid as the main research objects and carries out acidification experiments on sandstone in Changqing Oilfield, China. In addition, the effects of tribasic, dibasic, and monobasic acids on the mechanical properties of sandstone were studied. Results show that in this study area, the most obvious effect was seen with the use of dibasic acids (hydrochloric acid + acetic acid), which effectively reduced the sample quality, uniaxial compressive strength, and elastic modulus. Citric acid and Mg promote the conversion of amorphous calcium carbonate to high-crystallinity calcite, forming a white precipitate. Furthermore, it is found by scanning electron microscopy analysis that experimental group 5 (hydrochloric acid + acetic acid) has the most ideal rock erosion effect. Inductively coupled plasma emission spectrometry analysis shows that the acid rock is present in the solution. X-ray diffraction qualitative analysis of the composition and concentration of ions shows that the formation of white precipitates is citric acid and Mg promotes the conversion of amorphous calcium carbonate to high-crystallinity calcite, forming a white precipitate. The findings of this study can help to better understand the erosion, failure state, and failure mechanism of different acid types on sandstone, which may provide certain references and guidelines for sandstone acid fracturing oil production.

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Enhancing the permeability of a carbonate rock core by dissolution/precipitation treatment with organophosphorus additives evaluated by SEM/EDS and ICP-OES

Cited by 4 publications

References 11 publications

Transformation of oil scum as magnetic char for effective recovery of Cu and Ni from EDTA-bearing wastewater

Transformation of oil scum as magnetic char for effective recovery of Cu and Ni from EDTA-bearing wastewater

Flexible, Linear, and Systematically Expanded Tetraphosphonate Bolaamphiphiles and Their Inhibition Performance against Calcite and Barite Scale Formation

Study on the Performance Degradation of Sandstone under Acidification

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