FR2618846A2 - Procede de colmatage de formations souterraines notamment dans le secteur des forages petroliers ainsi que compositions et applications correspondantes - Google Patents
Procede de colmatage de formations souterraines notamment dans le secteur des forages petroliers ainsi que compositions et applications correspondantes Download PDFInfo
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- FR2618846A2 FR2618846A2 FR8710669A FR8710669A FR2618846A2 FR 2618846 A2 FR2618846 A2 FR 2618846A2 FR 8710669 A FR8710669 A FR 8710669A FR 8710669 A FR8710669 A FR 8710669A FR 2618846 A2 FR2618846 A2 FR 2618846A2
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- Prior art keywords
- applications
- oil drilling
- corresponding compositions
- underground formations
- fluid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 6
- 239000000203 mixture Substances 0.000 title description 8
- 238000005553 drilling Methods 0.000 title description 2
- 238000007789 sealing Methods 0.000 title description 2
- 239000012530 fluid Substances 0.000 claims abstract description 10
- 229920001222 biopolymer Polymers 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 241001430265 Beijerinckia indica subsp. indica Species 0.000 claims description 2
- 229920000298 Cellophane Polymers 0.000 claims description 2
- 235000009827 Prunus armeniaca Nutrition 0.000 claims description 2
- 244000018633 Prunus armeniaca Species 0.000 claims description 2
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 238000000855 fermentation Methods 0.000 claims description 2
- 230000004151 fermentation Effects 0.000 claims description 2
- 239000012634 fragment Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- FEBUJFMRSBAMES-UHFFFAOYSA-N 2-[(2-{[3,5-dihydroxy-2-(hydroxymethyl)-6-phosphanyloxan-4-yl]oxy}-3,5-dihydroxy-6-({[3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy}methyl)oxan-4-yl)oxy]-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl phosphinite Chemical compound OC1C(O)C(O)C(CO)OC1OCC1C(O)C(OC2C(C(OP)C(O)C(CO)O2)O)C(O)C(OC2C(C(CO)OC(P)C2O)O)O1 FEBUJFMRSBAMES-UHFFFAOYSA-N 0.000 claims 1
- 229920002305 Schizophyllan Polymers 0.000 claims 1
- 229920001285 xanthan gum Polymers 0.000 claims 1
- 229940082509 xanthan gum Drugs 0.000 claims 1
- 235000010493 xanthan gum Nutrition 0.000 claims 1
- 239000000230 xanthan gum Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract description 7
- 230000003111 delayed effect Effects 0.000 abstract description 3
- 238000005755 formation reaction Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000004115 Sodium Silicate Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052911 sodium silicate Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003349 gelling agent Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229930192033 plastin Natural products 0.000 description 1
- 108010049148 plastin Proteins 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000000518 rheometry Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Inorganic Chemistry (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Utilisation d'un gel retardé contenant en outre un biopolymère. Application au colmatage de formations dans lesquelles se produit une perte totale de fluide.
Description
1. Le brevet principal décrit un procédé pour colmater et/ou consolider
une formation géologique perméable notamment traversée par un puits de forage, caractérisé en ce qu'il comprend les étapes suivantes a) introduction dans la formation d'une composition de gel surretardé comprenant un-composé gélifiable et au moins un durcisseur, dont le temps de prise est nettement supérieur au temps de positionnement convenable de la composition, de façon à ce que celle-ci envahisse la formation depuis le puits et sur une distance notable; b) injection dans le puits, derrière un bouchon mécanique ou de fluide, d'un agent gélifiant à action rapide choisi de façon à provoquer la gélification instantanée de la partie de la composition de gel surretardé se trouvant au voisinage immédiat de l'interface de la zone à traiter et du puits de forage, ce qui stoppe le déplacement de la composition de gel surretardé vers
l'intérieur de la formation.
L'enseignement de ce -brevet principal no 86-16528 déposé le 25 novembre 1986 est entièrement incorporé ici pour référence et l'homme de métier pourra s'y reporter, et en particulier aux compositions et méthodes décrites pages 3 à 7 de ce document
86-16528.
La présente addition propose une variante de l'invention qui trouve une application spécifique pour résoudre le problème des
pertes totales de fluide durant le forage.
Ce problème apparait notamment en présence, non plus de pores ou canaux ("channels") de petites dimensions, mais en présence de
fractures ou vides ("voids") plus importants.
Le produit de traitement est alors perdu horizontalement et il n'éxiste plus aucune chance de colmater la formation responsable
de la perte sur une hauteur notable.
Selon la variante de l'invention applicable à ce cas, on incorporera dans les fluide de traitement de petites quantités de biopolymères capables de résister aux PH acides et basiques, en températures, et sous cisaillement. On viscosifie ainsi le fluide et on peut encore l'améliorer en lui incorporant des matières connues pour leur effet sur la perte de fluide ("lost circulation materials") telles que coques de noix, d'abricots, kolite, gilsonite, fragments de film de "cellophane". On étend ainsi notablement le champ d'application de l'invention aux formations
karstiques et "vugulaires" ("vugular">.
Dans l'art antérieur, la seule solution connue aux problèmes de pertes horizontales totales était en fait un expédient consistant à ne colmater que par étapes de 50 cm à 1 m de formation (en hauteur). Cet expédient non seulement est très peu économique mais de plus n'est même pas toujours utilisable, lorsque la hauteur de
formation à traiter est notable.
L'invention, par la modification du profil rhéologique et éventuellement la charge du fluide en agents colmatants ("bridging agents") permet selon la variante indiquer de colmater des hauteurs importantes de formation même dans le cas de pertes
totales, ce qui représente un avantage évident.
Des exemples convenables de biopolymères utilisables sont, à titre non limitatif, la gomme de anthane, le Scleroglucane, et le polymère obtenu par la fermentation bactérienne de Azotobacter Indicus (notamment "BIOZAN" de la société KELCO). On obtiendra une viscosification adéquate de la solution aqueuse de résine amino-plaste/silicate de sodium en utilisant une concentration en biopolymère d'environ 2 à 10 g/l d'eau fraiche (0,016 à 0,083 lbs/gal env.) Dans le cas ou des matériaux contre la perte de circulation sont
ajoutés, la proportion d'agent viscosifiant pourra etre réduite.
La quantité adéquate d'agent viscosifiant sera déterminée par l'application des équations de la mécanique des fluides bien
connues de l'homme du métier.
Exemple A:
Silicate de sodium (SiO2/Na20=3) 20 Z Résine aminoplaste 10 Z Eau fraiche 70 Z
(formulation de base les pourcentages sont en volume).
"BIOZAN" x g/l d'eau T = 40 deg C (104 deg F) x [ 0 2,5 4,0 8,0
[(0) (0,020) (0,033) (0,066)
PV 1 5,5 9,0 15,1
TY [ 0 3,4 6,5 16,2
[(0) (1,6) (3,1) (7,8)
GT 105 95 73 55
x = BIOZAN, g/l d'eau (lbs/gal) PV - viscosité plastique; cp À TY = seuil de cisaillement, lbs/100 sqft ( pa) GT = temps de gel, minutes, Le temps de gel est déterminé au viscosimètre Brookfield LVTD aiguille 1 à vitesse de rotation constante (entre 6 et 60 trs/min). On observe une brutale augmentation de viscosité, qui correspond à GT. On contrôle dans cet essai la température à +/- 1
deg C avec un bain thermostatique à recirculation.
Les caractéristiques de rhéologie sont déterminées selon la norme API spec. 10 pour laitiers de ciment après 20 min. d'agitation
dans un consistomètre atmosphérique à la température d'essai.
Exemple B
HMéme formulation de base: T = 80 deg C (176 deg F) x [0 4,0 8,0
[(0) (0,033) (0,066)
PV = 1 6,3 14,6
TY = [ 0 5,5 19,3
[(O) (2,6) (9,2)
GT = 67 50 58
(les abréviations et unités sont comme dans l'exemple A).
Claims (3)
1. Procédé selon l'une quelconque des revendications i à 9 du
brevet principal caractérisé en ce que l'on incorpore dans le fluide de traitement de petites quantités d'un biopolym&re capable de résister aux PH acides et basiques, en température,
et sous cisaillement.
2. Procédé selon la revendication 1 caractérisé en ce que ledit fluide comporte une gomme xanthane, du scleroglucane, ou le polymère résultant de la fermentation de Azotobacter Indicus, à
raison d'environ 2 à 10 g/litre d'eau.
3. Procédé selon la revendication 1 ou 2 caractérisé en ce que ledit fluide comporte en outre des matériaux tels que coques de
noix, d'abricots, kolite, gilsonite, fragments de "Cellophane".
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8710669A FR2618846A2 (fr) | 1986-11-25 | 1987-07-27 | Procede de colmatage de formations souterraines notamment dans le secteur des forages petroliers ainsi que compositions et applications correspondantes |
| DE8787201836T DE3769617D1 (de) | 1986-11-25 | 1987-09-24 | Verfahren zum verschliessen von unterirdischen formationen, speziell fuer oelfelder und vergleichbare anwendungen. |
| EP87201836A EP0272709B1 (fr) | 1986-11-25 | 1987-09-24 | Procédé de colmatage de formations souterraines, notamment dans le secteur des forages pétroliers et applications correspondantes |
| US07/122,958 US4838352A (en) | 1986-11-25 | 1987-11-19 | Process for plugging subterranean formations |
| BR8706341A BR8706341A (pt) | 1986-11-25 | 1987-11-24 | Processo para tamponamento de formacao subterraneas,particularmente em servicos de campos de oleo e aplicacoes correspondentes |
| CA000552584A CA1283848C (fr) | 1986-11-25 | 1987-11-24 | Methode d'obturation de gisements, notamment dans l'exploitation des champs petroliferes et dans des domaines connexes |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8616528A FR2607184A1 (fr) | 1986-11-25 | 1986-11-25 | Procede de colmatage de formations souterraines notamment dans le secteur des forages petroliers ainsi que compositions et applications correspondantes |
| FR8710669A FR2618846A2 (fr) | 1986-11-25 | 1987-07-27 | Procede de colmatage de formations souterraines notamment dans le secteur des forages petroliers ainsi que compositions et applications correspondantes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| FR2618846A2 true FR2618846A2 (fr) | 1989-02-03 |
Family
ID=26225607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8710669A Pending FR2618846A2 (fr) | 1986-11-25 | 1987-07-27 | Procede de colmatage de formations souterraines notamment dans le secteur des forages petroliers ainsi que compositions et applications correspondantes |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US4838352A (fr) |
| EP (1) | EP0272709B1 (fr) |
| BR (1) | BR8706341A (fr) |
| CA (1) | CA1283848C (fr) |
| DE (1) | DE3769617D1 (fr) |
| FR (1) | FR2618846A2 (fr) |
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|---|---|---|---|---|
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| US4953620A (en) * | 1989-08-14 | 1990-09-04 | Atlantic Richfield Company | Accelerating set of retarded cement |
| FR2656374B1 (fr) * | 1989-12-21 | 1996-01-05 | Inst Francais Du Petrole | Procede et composition pour la reduction selective de la permeabilite a l'eau dans les reservoirs d'hydrocarbures chauds et sales. |
| US4976316A (en) * | 1990-02-20 | 1990-12-11 | Atlantic Richfield Company | Method of accelerating set of cement by washover fluid containing alkanolamine |
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| US5341876A (en) * | 1993-05-10 | 1994-08-30 | Mobil Oil Corporation | Below fracture pressure pulsed gel injection method |
| US5423381A (en) * | 1993-10-29 | 1995-06-13 | Texaco Inc. | Quick-set formation treating methods |
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| US7665517B2 (en) | 2006-02-15 | 2010-02-23 | Halliburton Energy Services, Inc. | Methods of cleaning sand control screens and gravel packs |
| US7407010B2 (en) | 2006-03-16 | 2008-08-05 | Halliburton Energy Services, Inc. | Methods of coating particulates |
| US7500521B2 (en) | 2006-07-06 | 2009-03-10 | Halliburton Energy Services, Inc. | Methods of enhancing uniform placement of a resin in a subterranean formation |
| US7934557B2 (en) | 2007-02-15 | 2011-05-03 | Halliburton Energy Services, Inc. | Methods of completing wells for controlling water and particulate production |
| US7762329B1 (en) | 2009-01-27 | 2010-07-27 | Halliburton Energy Services, Inc. | Methods for servicing well bores with hardenable resin compositions |
| CA2768936A1 (fr) * | 2009-07-31 | 2011-02-03 | Bp Corporation North America Inc. | Procede de commande de percee d'un fluide d'entrainement pendant la production d'hydrocarbures provenant d'un reservoir souterrain |
| AU2011252819A1 (en) * | 2010-05-14 | 2012-12-06 | Chemical Delivery Systems, Inc. | Materials and methods for temporarily obstructing portions of drilled wells |
| US20170015899A1 (en) * | 2015-03-11 | 2017-01-19 | Trican Well Service, Ltd. | Controlling solid suspension in fluids |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1119947A (en) * | 1966-06-28 | 1968-07-17 | Byron Jackson Inc | Consolidation of earth formations |
| US3882938A (en) * | 1972-07-17 | 1975-05-13 | Union Oil Co | Process for recovering oil from heterogeneous reservoirs |
| US4004639A (en) * | 1976-03-17 | 1977-01-25 | Union Oil Company Of California | Selectively plugging the more permeable strata of a subterranean formation |
| FR2551451A1 (fr) * | 1983-08-31 | 1985-03-08 | Hoechst France | Composition d'injection pour le colmatage ou la consolidation des sols |
| EP0146981A1 (fr) * | 1983-12-07 | 1985-07-03 | Etudes et Fabrication Dowell Schlumberger | Applications de scléroglucane dans l e traitement de puits de pétrole et installations de forage de pétrole |
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| US3146828A (en) * | 1960-12-14 | 1964-09-01 | Continental Oil Co | Methods and compositions for well completion |
| US3435899A (en) * | 1967-04-24 | 1969-04-01 | Halliburton Co | Delayed gelling of sodium silicate and use therefor |
| US3741307A (en) * | 1971-03-09 | 1973-06-26 | Union Oil Co | Oil recovery method |
| US3805893A (en) * | 1972-08-28 | 1974-04-23 | Union Oil Co | Mobility-controlled caustic flood |
| US3884302A (en) * | 1974-05-29 | 1975-05-20 | Mobil Oil Corp | Well cementing process |
| FR2559832B1 (fr) * | 1984-02-17 | 1986-05-30 | Rhone Poulenc Rech | Procede de colmatage reversible de formations souterraines |
| DE3421085C1 (de) * | 1984-06-06 | 1985-10-31 | F. Willich GmbH & Co, 4600 Dortmund | Verfahren zum Verfestigen und Abdichten von Kohle und/oder Gebirgs- und Erdformationen |
| US4590228A (en) * | 1985-02-15 | 1986-05-20 | Societe Francaise Hoechst | Injection composition for filling or reinforcing grounds |
| US4669543A (en) * | 1986-05-23 | 1987-06-02 | Halliburton Company | Methods and compositions for consolidating solids in subterranean zones |
-
1987
- 1987-07-27 FR FR8710669A patent/FR2618846A2/fr active Pending
- 1987-09-24 DE DE8787201836T patent/DE3769617D1/de not_active Expired - Fee Related
- 1987-09-24 EP EP87201836A patent/EP0272709B1/fr not_active Expired
- 1987-11-19 US US07/122,958 patent/US4838352A/en not_active Expired - Fee Related
- 1987-11-24 BR BR8706341A patent/BR8706341A/pt unknown
- 1987-11-24 CA CA000552584A patent/CA1283848C/fr not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1119947A (en) * | 1966-06-28 | 1968-07-17 | Byron Jackson Inc | Consolidation of earth formations |
| US3882938A (en) * | 1972-07-17 | 1975-05-13 | Union Oil Co | Process for recovering oil from heterogeneous reservoirs |
| US4004639A (en) * | 1976-03-17 | 1977-01-25 | Union Oil Company Of California | Selectively plugging the more permeable strata of a subterranean formation |
| FR2551451A1 (fr) * | 1983-08-31 | 1985-03-08 | Hoechst France | Composition d'injection pour le colmatage ou la consolidation des sols |
| EP0146981A1 (fr) * | 1983-12-07 | 1985-07-03 | Etudes et Fabrication Dowell Schlumberger | Applications de scléroglucane dans l e traitement de puits de pétrole et installations de forage de pétrole |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1283848C (fr) | 1991-05-07 |
| EP0272709B1 (fr) | 1991-04-24 |
| EP0272709A1 (fr) | 1988-06-29 |
| BR8706341A (pt) | 1988-07-26 |
| US4838352A (en) | 1989-06-13 |
| DE3769617D1 (de) | 1991-05-29 |
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