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公开(公告)号：EP0764061A1
公开(公告)日：1997-03-26
申请号：EP95908050.0
申请日：1995-01-13
发明人： PAUL, James, Mark
摘要： The present invention relates to a method of removing alkaline earth sulphate scale (22) from the interior surface of downhole production tubing (16) comprising contacting the scale (22) with a solvent having a specific gravity of at least 1.2 while simultaneously milling the scale (22) with a rotating mill head (20) connected to a downhole motor.
摘要翻译： 本发明涉及一种从井下生产油管（16）的内表面除去碱土硫酸盐垢（22）的方法，包括使所述垢（22）与比重至少为1.2的溶剂接触，同时研磨所述垢 （22）具有连接到井下马达的旋转磨机头（20）。
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2.发明公开A METHOD OF SCALE DISSOLUTION IN A FORMATION CONTAINING MULTIPLE PRODUCTIVE INTERVALS 失效PROCESS FOR量表在与挑衅多层地层的决议
公开(公告)号：EP0728254A1
公开(公告)日：1996-08-28
申请号：EP95905400.0
申请日：1994-12-08
摘要： A method to improve the efficiency of scale dissolution in a formation containing multiple productive intervals (20, 22, 24, 26) where variable density liquids are utilized. Initially, a liquid composition sufficient to solubilize an alkaline-earth metal sulphate scale deposit is directed into a wellbore (10) thereby contacting scale in one productive interval of the formation. Thereafter, a second scale solubilizing liquid having a density less than the first liquid is directed into the wellbore (10) thereby contacting additional perforations (14) and a higher interval. These scale solubilizing liquids with varying densities are allowed to remain in contact with perforations (14) and productive intervals (20, 22, 24, 26) communicating therewith for a time sufficient to solubilize the scale deposit thereby efficiently removing said scale deposit from perforations (14) and productive intervals (20, 22, 24, 26) at two different levels.
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公开(公告)号：EP0861309A1
公开(公告)日：1998-09-02
申请号：EP96926842.0
申请日：1996-08-02
CPC分类号： B01D21/283 , B03B5/02 , B09C1/025 , C10G1/04 , E21B21/066 , E21B41/005
摘要： Oil is extracted from oil-contaminated soil by mixing a solvent with the soil to form a slurry, passing the slurry through a shaker screen (14) to remove soil particles greater than 1/4 inch and then feeding the slurry into the top of an acoustic chamber (16). Fresh solvent is injected into the bottom of the acoustic chamber (16) and flows upwardly through it at a rate such that the soil particles fall through the flowing solvent. The soil particles and solvent in the acoustic chamber are subjected to acoustic energy in the frequency range of 0.5 to 2.0 kHz to displace the oil from the soil particles without cavitation of the solvent. Soil particles (26) containing only 0.2 to 0.4 wt.% oil are recovered from the bottom of the acoustic chamber (16) and spread over the land for land farming. The method may also be used for extracting oil from oily sludge or oil-based drill cuttings.
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公开(公告)号：EP0431085B1
公开(公告)日：1995-02-01
申请号：EP90905855.4
申请日：1990-04-03
CPC分类号： C02F5/12 , B09C1/02 , C02F5/08 , C02F5/10 , C02F2101/006 , C09K8/528 , E21B43/28 , G21F9/002
摘要： Surface layers of the earth contaminated with precipitates of alkaline earth metal sulfates including radium sulfate derived from subterranean waters brought to the surface of the earth, are decontaminated using an aqueous chemical composition including a polyaminopolycarboxylic acid such as ETDA or DTPA in combination with a synergist, preferably oxalate or monocarboxylic acid anion such as salicylate. The surface layers may be decontaminated in situ by applying the solvent to the earth to bring the precipitates into dissolved form after which the dissolved precipitates are leached into lower layers of the earth by percolation with water. Alternatively, the earth may be removed from its original site and decontaminated in a tank or lined pond after which the decontaminated earth may be returned to its approximate original site. There is also disclosed a method of decontaminating natural gas processing equipment using the aqueous chemical composition.
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公开(公告)号：EP0431085A1
公开(公告)日：1991-06-12
申请号：EP90905855.0
申请日：1990-04-03
CPC分类号： C02F5/12 , B09C1/02 , C02F5/08 , C02F5/10 , C02F2101/006 , C09K8/528 , E21B43/28 , G21F9/002
摘要： On décontamine des couches superficielles de la terre contaminées par des précipités de sulfates de métal alcalino-terreux comprenant le sulfate de radium provenant des eaux souterraines amenées à la surface de la terre, par l'utilisation d'une composition chimique aqueuse qui comprend un acide polyaminopolycarboxylique tel que l'ETDA ou le DTPA en combinaison avec un agent synergique, de préférence l'oxalate ou l'anion acide monocarboxylique tel que le salicylate. On peut décontaminer lesdites couches superficielles in situ par l'application du solvant à la terre pour dissoudre les précipités, et ensuite on lessive les précipités dissous dans des couches plus profondes de la terre par percolation d'eau. Une autre solution consiste à retirer l'eau de son emplacement d'origine, et à la décontaminer dans une cuve ou dans une piscine recouverte, et ensuite à la rapporter à son emplacement d'origine approximatif. On divulgue aussi une méthode pour la décontamination des appareils de traitement de gaz naturel, utilisant la composition chimique aqueuse.
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