公开(公告)号：EP1556582B1

公开(公告)日：2008-08-06

申请号：EP03776870.2

申请日：2003-10-24

申请人： Services Pétroliers Schlumberger ,  SCHLUMBERGER HOLDINGS LIMITED ,  SCHLUMBERGER TECHNOLOGY B.V. ,  SOFITECH N.V.

发明人： STILL, John ,  DISMUKE, Keith ,  FRENIER, Wayne

IPC分类号： C09K8/72

CPC分类号： C09K8/06 ,  C09K8/03 ,  C09K8/5045 ,  C09K8/506 ,  C09K8/72 ,  C09K8/74 ,  Y10S507/923 ,  Y10S507/933

摘要： An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and a copolymer of lactic acid with other hydroxy-, carboxylic acid or hydroxycarboxylic acid-containing moieties. The solid acid-precursor may be mixed with a solid acid-reactive material to accelerate the hydrolysis and/or coated to slow the hydrolysis. Water-soluble liquid compounds are also given that accelerate the hydrolysis. The method ensures that the acid contacts fracture faces far from the wellbore.

公开(公告)号：EP1556458B1

公开(公告)日：2007-01-03

申请号：EP03769417.1

申请日：2003-10-17

申请人： Services Pétroliers Schlumberger ,  SCHLUMBERGER HOLDINGS LIMITED ,  SCHLUMBERGER TECHNOLOGY B.V. ,  SOFITECH N.V.

发明人： WILLBERG, Dean ,  DISMUKE, Keith

IPC分类号： C09K8/02 ,  E21B33/138 ,  E21B37/06 ,  C09K8/04

CPC分类号： C09K8/06 ,  C09K8/03 ,  C09K8/5045 ,  C09K8/506 ,  C09K8/72 ,  C09K8/74 ,  Y10S507/923 ,  Y10S507/933

摘要： A composition and method are given for self-destructive fluid loss additives and filter cakes in wellbores and subterranean formations. The fluid loss additives and filter cakes are formed from a mixture of particulate solid acid-precursors, such as a polylactic acid or a polyglycolic acid, and particulate solid acid-reactive materials, such as magnesium oxide or calcium carbonate. In the presence of water, the solid acid-precursors hydrolyze and dissolve, generating acids that then dissolve the solid acid-reactive materials. The composition is used in oilfield treatments such as drilling, completion and stimulation where it disappears when it is no longer needed without the use of mechanical means or injection of additional fluids.

公开(公告)号：EP1556582A1

公开(公告)日：2005-07-27

申请号：EP03776870.2

申请日：2003-10-24

申请人： Services Pétroliers Schlumberger ,  Schlumberger Holdings Limited ,  Schlumberger Technology B.V. ,  SOFITECH N.V.

发明人： STILL, John ,  DISMUKE, Keith ,  FRENIER, Wayne

IPC分类号： E21B43/27

CPC分类号： C09K8/06 ,  C09K8/03 ,  C09K8/5045 ,  C09K8/506 ,  C09K8/72 ,  C09K8/74 ,  Y10S507/923 ,  Y10S507/933

摘要： An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic acid, a copolymer of glycolic acid with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties, and a copolymer of lactic acid with other hydroxy-, carboxylic acid or hydroxycarboxylic acid-containing moieties. The solid acid-precursor may be mixed with a solid acid-reactive material to accelerate the hydrolysis and/or coated to slow the hydrolysis. Water-soluble liquid compounds are also given that accelerate the hydrolysis. The method ensures that the acid contacts fracture faces far from the wellbore.

公开(公告)号：EP1556458A1

公开(公告)日：2005-07-27

申请号：EP03769417.1

申请日：2003-10-17

申请人： Services Pétroliers Schlumberger ,  Schlumberger Holdings Limited ,  Schlumberger Technology B.V. ,  SOFITECH N.V.

发明人： WILLBERG, Dean ,  DISMUKE, Keith

IPC分类号： C09K7/00 ,  E21B33/138 ,  E21B37/06 ,  C09K7/02

CPC分类号： C09K8/06 ,  C09K8/03 ,  C09K8/5045 ,  C09K8/506 ,  C09K8/72 ,  C09K8/74 ,  Y10S507/923 ,  Y10S507/933

摘要： A composition and method are given for self-destructive fluid loss additives and filter cakes in wellbores and subterranean formations. The fluid loss additives and filter cakes are formed from a mixture of particulate solid acid-precursors, such as a polylactic acid or a polyglycolic acid, and particulate solid acid-reactive materials, such as magnesium oxide or calcium carbonate. In the presence of water, the solid acid-precursors hydrolyze and dissolve, generating acids that then dissolve the solid acid-reactive materials. The composition is used in oilfield treatments such as drilling, completion and stimulation where it disappears when it is no longer needed without the use of mechanical means or injection of additional fluids.

公开(公告)号：EP1268976B1

公开(公告)日：2011-10-05

申请号：EP01933791.4

申请日：2001-04-03

申请人： Sofitech N.V. ,  SERVICES PETROLIERS SCHLUMBERGER (SPS) ,  Schlumberger Canada Limited ,  SCHLUMBERGER TECHNOLOGY B.V.

发明人： NELSON, Erik, B. ,  LUNGWITZ, Bernhard ,  DISMUKE, Keith ,  SAMUEL, Mathew ,  HUGHES, Trevor, L. ,  PARRIS, Michael ,  SALAMAT, Golchi ,  LEE, Jesse, C. ,  FLETCHER, Philip ,  FU, Diankui ,  HUTCHINS, Richard ,  TUSTIN, Gary, J.

IPC分类号： E21B43/25

CPC分类号： C09K8/92 ,  C09K8/536 ,  C09K8/62 ,  C09K8/72 ,  C09K8/74 ,  C09K2208/26 ,  Y10S507/921 ,  Y10S507/922

摘要： Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the use of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system such as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.

公开(公告)号：EP1268976A2

公开(公告)日：2003-01-02

申请号：EP01933791.4

申请日：2001-04-03

申请人： Sofitech N.V. ,  SERVICES PETROLIERS SCHLUMBERGER (SPS) ,  SCHLUMBERGER CANADA LIMITED ,  Schlumberger Technology B.V.

发明人： NELSON, Erik, B. ,  LUNGWITZ, Bernhard ,  DISMUKE, Keith ,  SAMUEL, Mathew ,  HUGHES, Trevor, L. ,  PARRIS, Michael ,  SALAMAT, Golchi ,  LEE, Jesse, C. ,  FLETCHER, Philip ,  FU, Diankui ,  HUTCHINS, Richard ,  TUSTIN, Gary, J.

IPC分类号： E21B43/25

CPC分类号： C09K8/92 ,  C09K8/536 ,  C09K8/62 ,  C09K8/72 ,  C09K8/74 ,  C09K2208/26 ,  Y10S507/921 ,  Y10S507/922

摘要： Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte concentration or composition of the viscoelastic surfactant fluids. One aspect of the invention relates to the use of internal breakers with a delayed activation. Another aspect of the invention relates to the use of precursors that release a breaking system such as alcohol by a process such as melting, slow dissolution, reaction with a compound present in the fluid or added to the fluid during or after the step of injecting, rupture of an encapsulating coating and de-adsorption of a breaking agent absorbed into solid particles. In another aspect of the invention, alcohols are included in a pad to reduce the low-shear viscosity and reduce the resistance to flow of the treatment fluids during a desired phase of the treatment.