WO2006018778A1 - Acidification de matrice de formations a contrastes de permeabilite eleves - Google Patents

Acidification de matrice de formations a contrastes de permeabilite eleves Download PDF

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Publication number
WO2006018778A1
WO2006018778A1 PCT/IB2005/052621 IB2005052621W WO2006018778A1 WO 2006018778 A1 WO2006018778 A1 WO 2006018778A1 IB 2005052621 W IB2005052621 W IB 2005052621W WO 2006018778 A1 WO2006018778 A1 WO 2006018778A1
Authority
WO
WIPO (PCT)
Prior art keywords
zone
acid
fluid
vda
tubing
Prior art date
Application number
PCT/IB2005/052621
Other languages
English (en)
Inventor
Gustavo Cavazzoli
Juan Gabriel Blanco
J. Ernest Brown
Pia-Angela Francini
Diankui Fu
Original Assignee
Schlumberger Canada Limited
Services Petroliers Schlumberger
Schlumberger Holdings Limited
Schlumberger Technology B.V.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schlumberger Canada Limited, Services Petroliers Schlumberger, Schlumberger Holdings Limited, Schlumberger Technology B.V. filed Critical Schlumberger Canada Limited
Priority to MX2007000771A priority Critical patent/MX2007000771A/es
Publication of WO2006018778A1 publication Critical patent/WO2006018778A1/fr

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Classifications

    • 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
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E21B43/27—Methods for stimulating production by forming crevices or fractures by use of eroding chemicals, e.g. acids
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/602—Compositions for stimulating production by acting on the underground formation containing surfactants
    • 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
    • C09K8/60—Compositions for stimulating production by acting on the underground formation
    • C09K8/62—Compositions for forming crevices or fractures
    • C09K8/72—Eroding chemicals, e.g. acids
    • C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
    • 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
    • C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
    • C09K2208/30—Viscoelastic surfactants [VES]

Definitions

  • the invention relates to a combination of Tubing Conveyed Perforation (TCP) and acidizing with the use of Viscoelastic Diverting Acid (VDA) for effective matrix stimulation of multiple zones having large permeability contrasts.
  • TCP Tubing Conveyed Perforation
  • VDA Viscoelastic Diverting Acid
  • diversion is required to ensure stimulation of the entire interval, especially for carbonate formations.
  • acid is injected into such a reservoir, it preferentially enters the more permeable zone or zones or the first zone or zones encountered. At some point, the operator must then stop injection, place a mechanical or chemical diverter to control subsequent leakoff into the already-treated zone, and then resume acid injection.
  • Viscoelastic surfactant (VES) based self-diverting acid systems were developed as single fluid systems that stimulate and divert simultaneously for carbonate formations. Such as system has low viscosity as formulated and pumped, but it reduces the chances of forming a dominating wormhole or thief zone when it is injected because it temporarily forms a viscous barrier, which is developed as the acid is spent in the formation, because the fluid undergoes an increase in viscosity as the acid is spent. The viscous barrier forces the following acid into other zones that have lower injectivity so that those zones can also be effectively stimulated.
  • the viscous barrier breaks down upon contacting produced hydrocarbon, produced water, produced preflush fluids, or postflush fluids, leaving no solid residue to cause formation damage to the rock, because the VES system contains no solids or polymer. This is a very effective treatment for a single zone, especially if it is not thick, and it can also be used in thick zones or multiple zones.
  • One embodiment of the invention is a method of stimulating a subterranean formation penetrated by a wellbore involving perforating a first zone with a perforation string conveyed on tubing, followed by a first injection step made up of injecting a fluid including a self-diverting acid through the tubing into the first zone. Then the tubing is moved to a second zone, which is then perforated, followed by a second injection step made up of injecting fluid including a stimulation fluid into the second zone.
  • the first zone is less permeable than the second zone, and, usually, fluid is not flowed back into the well from the formation between the first injection step and the second injection step.
  • the stimulation fluid in the second step also includes self-diverting acid.
  • the second injection step is followed by the successive steps of moving the tubing to a third zone and perforating the third zone, then injecting a fluid including a stimulation fluid into the third zone. In that case, generally before treatment the second zone is less permeable than the third zone. Also, generally, in that case fluid is not flowed back into the well from the formation between the second injection step and the step of injecting a fluid including a stimulation fluid into the third zone. In other embodiments, such cycles of perforation and injection are repeated.
  • the first injection step includes injecting alternating stages of a fluid including an acid and a fluid including a viscoelastic diverting acid.
  • the second injection step includes injecting alternating stages of a fluid containing an acid and a fluid containing a viscoelastic diverting acid.
  • both injection steps include injecting alternating stages of a fluid containing an acid and a fluid containing a viscoelastic diverting acid.
  • the self-diverting acid includes a betaine and/or an amidoamine oxide.
  • TCP is Tubing Conveyed Perforation, where the tubing may be coiled or conventional tubing.
  • TCP assembly When the tubing is conventional, jointed, tubing the method generally uses a permanent completion in which the perforation equipment (or "TCP assembly") remains in the well; where the tubing is coiled tubing; the perforation string (or "CT Perforating assembly”) is retrieved.
  • TCP assembly the perforation equipment
  • CT Perforating assembly the perforation string
  • the method will generally be used with coiled tubing and will be described in terms of coiled tubing, but it is to be understood that the method is applicable to both types of tubing.
  • TCP enables sequential perforation of different intervals, it also allows pumping of VDA though the conveying tubing.
  • VDA being a highly effective self-diverting acid
  • VDA also provides good leakoff control after the acidizing treatment of each perforated interval, as the spent VDA is highly viscous, and remains viscous during treatment, even at elevated temperatures.
  • the VDA system is easily pumped through coiled tubing because it has low viscosity as formulated and contains no solids that could make pumping through the tubing difficult or that could cause damage by solids in the newly created conductive channels.
  • the surfactant gel breaks down on contact with, for example, produced oil, or condensate and mutual solvent preflush flowback, or when diluted with produced formation brine during flowback.
  • a preflush or postflush (also called overflush) solution enhances the breakdown of the gelled surfactant and promotes quick cleanup.
  • the method eliminates the need for a) mechanical zonal isolation, b) injection of many fluids, c) injection of solids, and d) multiple trips downhole.
  • the highest permeability region is, by the nature of the conventional treatment, treated first.
  • the lowest permeability region is stimulated first.
  • the tubing conveyed perforation technique is combined with the use of a self-diverting acid fluid system (such as a VDA system) during acidizing to provide effective stimulation of layers (especially multiple layers) having large permeability contrasts, or layers extending over very large intervals.
  • the disclosed process involves alternating stages of tubing conveyed perforation and acid treatment (which may be all VDA or may be VDA following or alternating with other acid), without wasteful pumping of additional fluid into the stimulated zones, after each acid injection, for control of leakoff during succeeding perforation and stimulation stages.
  • the zone or zones are not isolated from one another, for example with packers, and separate diverters are not used.
  • the method results in a much more homogeneous and uniform treatment of the entire thick or multi-zone system. After acidizing, there is usually near wellbore damage, resulting in a skin.
  • the second zone treated is thin, or is the last zone to be treated, it may optionally be treated with acid only and not with VDA, but it is usually preferable to treat with VDA or alternating acid and VDA.
  • the first stimulation fluid injected is acid, not VDA, although the first stimulation fluid may be acid if desired.
  • the lowest permeability zone is treated first.
  • the acid is normally hydrochloric acid but may be any acid or mixture of acids, organic or inorganic, delayed or not, used for carbonate formation stimulation.
  • the concentration is any concentration used for carbonate stimulation.
  • hydrochloric acid the concentration range is from about 3% to about 36%, preferably from about 7.5% to about 20%.
  • the acid in the VDA stage(s) is usually the same as the acid in the non-VDA stage(s) but need not be.
  • the "acid" in the non-VDA stage(s) may also be a "non-acidic" stimulation fluid (sometimes called a non-acidic reactive solution or NARS) for example a chelating agent, such as an aminocarboxylic acid, such as ethylenediaminetetraacetic acid (EDTA).
  • Delay may be by any method used to delay acids, for example by forming an emulsion.
  • VDA fluid systems have been described in U. S. Patent No. 6,667,280 and U. S. Patent Application Publication No. 2003/0119680, both hereby incorporated in their entirety. They contain viscoelastic surfactants (VES 's), such as those described in those references, and acids, for example hydrochloric acid. Additional surfactants that may be used to form VDA systems are described in U. S. Patent No. 6,258,859, hereby incorporated in its entirety. Suitable surfactants for formation of VDA systems are, for example, betaines and amidoamine oxides or mixtures of these surfactants.
  • the stimulation fluid/diverter fluid is left in the formation during the successive stages of treatment.
  • Treatment/diverter fluid especially for example the fluid from the first stage, may be left in the formation for a long time. There is no need for removal or flowback of any fluids during any but the last stage; they are non-damaging.
  • Treatment of the zones may be performed one after the other without flowback of each individual zone. Flowback is performed only after the last zone is treated. There is no urgency to remove the diverter fluid or the treatment fluid as quickly as possible, as there might be if it contained polymer. Polymer can be more damaging the longer it remains in a formation.
  • the stimulation fluid injected into each zone acts as the diverting agent for the subsequent treatments without the need for mechanical isolation.
  • Another major advantage is that not all of the diverter fluid must be removed, even at the end of the treatment. Any VES remaining, and not cleaned up, will be non-damaging.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

La présente invention concerne un procédé de stimulation de l'épaisseur de formations multicouches hétérogènes ou homogènes en un seul passage sans remblayeurs qui consiste à perforer avec cuvelage, depuis à injecter un acide autodétournant, puis à déplacer la tige de forage et à perforer un nouvel emplacement et, enfin à injecter un acide autodétournant additionnel. Cette séquence peut-être répétée. L'acide et de préférence un acide autodétournant viscoélastique. C'est acide autodétournant peut-être échangé avec un fluide de traitement classique. Ce travail a pour objet de traiter d'abord la ou les zone les moins perméables et de maximiser l'efficacité de l'acide.
PCT/IB2005/052621 2004-08-16 2005-08-05 Acidification de matrice de formations a contrastes de permeabilite eleves WO2006018778A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
MX2007000771A MX2007000771A (es) 2004-08-16 2005-08-05 Formaciones con altos niveles de contrastes en la permeabilidad y con acidificacion de la matriz.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60191204P 2004-08-16 2004-08-16
US60/601,912 2004-08-16

Publications (1)

Publication Number Publication Date
WO2006018778A1 true WO2006018778A1 (fr) 2006-02-23

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2005/052621 WO2006018778A1 (fr) 2004-08-16 2005-08-05 Acidification de matrice de formations a contrastes de permeabilite eleves

Country Status (2)

Country Link
MX (1) MX2007000771A (fr)
WO (1) WO2006018778A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10787901B2 (en) 2016-09-16 2020-09-29 Halliburton Energy Services, Inc. Dynamically optimizing a pumping schedule for stimulating a well

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020092650A1 (en) * 2000-02-15 2002-07-18 Tolman Randy C. Method and apparatus for stimulation of multiple formation intervals
WO2004020788A1 (fr) * 2002-08-30 2004-03-11 Schlumberger Canada Limited Fluides de traitement de reservoir

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020092650A1 (en) * 2000-02-15 2002-07-18 Tolman Randy C. Method and apparatus for stimulation of multiple formation intervals
WO2004020788A1 (fr) * 2002-08-30 2004-03-11 Schlumberger Canada Limited Fluides de traitement de reservoir

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10787901B2 (en) 2016-09-16 2020-09-29 Halliburton Energy Services, Inc. Dynamically optimizing a pumping schedule for stimulating a well

Also Published As

Publication number Publication date
MX2007000771A (es) 2007-04-02

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