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Process for plugging subterranean formations
Geothermics, Vol. 19, No. 2, pp. 309-310, 1990 Printed in Great Britain.
Pergamon Press plc
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH ~ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH" can be obtained from Pergamon Orbit InfoLine Inc., 8000 Westpark Drive, McLean, Virginia 22102 U.S.A. Copies of complete patents announced in this Section are available from Pergamon Orbit InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon Orbit InfoLine only.
4829954
4838352
METHOD OF FORMING SELFSEALING PISTON
PROCESS FOR PLUGGING SUBTERRANEAN FORMATIONS
Ralph G Morgado
Rudiger Oberste-Padtberg, Herve Parcevaux Philippe Perthuis, Sylvie Peulet, St Etienne, France assigned to Dowell Schlumberger Incorporated
A spherically-shaped piston is rigidly attached to a connecting rod for reciprocating and tilting motion within a borehole in response to rotation of a crankshaft having an associated crank which is rotatably attached to the connecting rod. Web and ribs and ridges integrally formed on the hollow, underside of the piston control thermal transfer and deformation to assure continuous perimeter seal with the wails of the borehole over all operating temperatures as the piston sides and tilts within the borehole.
The invention concerns a new process for plugging and/or consolidating a permeable geological formation, notably when traversed by a borehole. The process, according to this invention, comprises the following steps: (a) insertion into the formation of an overdelayed gelling compound, composed o f a gelable material and a hardener, for which the setting time is considerably longer than the suitable positioning time for the composition, in such a way that this permeates the formation over a significant distance. (b) insertion, after a mechanical or fluid plug, of a rapid-action gelling agent, which causes the instantaneous gelling of that part of the overdelayed gelling compound in the immediate neighborhood of the interface between the zone to be treated and the borehole. Thus preventing displacement of the overdelayed gelling compound toward the interior of the formation. The resultant gelling being both resistant and correctly placed. The invention application is to oil, gas, water or geothermal drillings.
4830766 USE OF REDUCING AGENTS TO CONTROL SCALE DEPOSITION FROM HIGH TEMPERATURE BRINE Darrell L Gallup, John W Jost assigned to Union Oil Company of California The deposition of metal-containing scale, such as iron silicate scale, from a hot aqueous geothermal brine, or the like, is controlled by blending into the brine sufficient reducing agent effective for reducing trivalent iron and manganese cations in a high temperature brine solution to divalent ions to cause an overall decrease in scale deposition, especially of iron silicate scale. Preferably, from 2 to 7 times the stoichiometric amount of reducing agent is used to effect a 70 to 90 percent reduction in the formation of iron silicate scale.
4839095 STABLE M U D DRILLING FLUID ADDITIVE, COMPOSITION AND PROCESS FOR MAKING THE SAME Shawqu Lahalih, Issa Dairanieh, M a ' m u n AbsiHalabi, Safat, Kuwait 309
Pergamon Press plc
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH ~ online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH" can be obtained from Pergamon Orbit InfoLine Inc., 8000 Westpark Drive, McLean, Virginia 22102 U.S.A. Copies of complete patents announced in this Section are available from Pergamon Orbit InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon Orbit InfoLine only.
4829954
4838352
METHOD OF FORMING SELFSEALING PISTON
PROCESS FOR PLUGGING SUBTERRANEAN FORMATIONS
Ralph G Morgado
Rudiger Oberste-Padtberg, Herve Parcevaux Philippe Perthuis, Sylvie Peulet, St Etienne, France assigned to Dowell Schlumberger Incorporated
A spherically-shaped piston is rigidly attached to a connecting rod for reciprocating and tilting motion within a borehole in response to rotation of a crankshaft having an associated crank which is rotatably attached to the connecting rod. Web and ribs and ridges integrally formed on the hollow, underside of the piston control thermal transfer and deformation to assure continuous perimeter seal with the wails of the borehole over all operating temperatures as the piston sides and tilts within the borehole.
The invention concerns a new process for plugging and/or consolidating a permeable geological formation, notably when traversed by a borehole. The process, according to this invention, comprises the following steps: (a) insertion into the formation of an overdelayed gelling compound, composed o f a gelable material and a hardener, for which the setting time is considerably longer than the suitable positioning time for the composition, in such a way that this permeates the formation over a significant distance. (b) insertion, after a mechanical or fluid plug, of a rapid-action gelling agent, which causes the instantaneous gelling of that part of the overdelayed gelling compound in the immediate neighborhood of the interface between the zone to be treated and the borehole. Thus preventing displacement of the overdelayed gelling compound toward the interior of the formation. The resultant gelling being both resistant and correctly placed. The invention application is to oil, gas, water or geothermal drillings.
4830766 USE OF REDUCING AGENTS TO CONTROL SCALE DEPOSITION FROM HIGH TEMPERATURE BRINE Darrell L Gallup, John W Jost assigned to Union Oil Company of California The deposition of metal-containing scale, such as iron silicate scale, from a hot aqueous geothermal brine, or the like, is controlled by blending into the brine sufficient reducing agent effective for reducing trivalent iron and manganese cations in a high temperature brine solution to divalent ions to cause an overall decrease in scale deposition, especially of iron silicate scale. Preferably, from 2 to 7 times the stoichiometric amount of reducing agent is used to effect a 70 to 90 percent reduction in the formation of iron silicate scale.
4839095 STABLE M U D DRILLING FLUID ADDITIVE, COMPOSITION AND PROCESS FOR MAKING THE SAME Shawqu Lahalih, Issa Dairanieh, M a ' m u n AbsiHalabi, Safat, Kuwait 309