Language selection

Search

Patent 2642930 Summary

Third-party information liability

Some of the information on this Web page has been provided by external sources. The Government of Canada is not responsible for the accuracy, reliability or currency of the information supplied by external sources. Users wishing to rely upon this information should consult directly with the source of the information. Content provided by external sources is not subject to official languages, privacy and accessibility requirements.

Claims and Abstract availability

Any discrepancies in the text and image of the Claims and Abstract are due to differing posting times. Text of the Claims and Abstract are posted:

  • At the time the application is open to public inspection;
  • At the time of issue of the patent (grant).
(12) Patent Application: (11) CA 2642930
(54) English Title: SUBTERRANEAN TREATMENT FLUIDS COMPRISING SUBSTANTIALLY HYDRATED CEMENT PARTICULATES
(54) French Title: FLUIDES DE TRAITEMENT SOUTERRAINS COMPRENANT DES MATIERES PARTICULAIRES DE CIMENT SENSIBLEMENT HYDRATEES
Status: Dead
Bibliographic Data
(51) International Patent Classification (IPC):
  • C09K 8/62 (2006.01)
  • C09K 8/56 (2006.01)
  • C09K 8/70 (2006.01)
  • E21B 43/04 (2006.01)
  • E21B 43/26 (2006.01)
(72) Inventors :
  • RODDY, CRAIG W. (United States of America)
(73) Owners :
  • HALLIBURTON ENERGY SERVICES, INC. (United States of America)
(71) Applicants :
  • HALLIBURTON ENERGY SERVICES, INC. (United States of America)
(74) Agent: NORTON ROSE FULBRIGHT CANADA LLP/S.E.N.C.R.L., S.R.L.
(74) Associate agent:
(45) Issued:
(86) PCT Filing Date: 2007-03-21
(87) Open to Public Inspection: 2007-10-04
Examination requested: 2008-08-20
Availability of licence: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): Yes
(86) PCT Filing Number: PCT/GB2007/001016
(87) International Publication Number: WO2007/110591
(85) National Entry: 2008-08-20

(30) Application Priority Data:
Application No. Country/Territory Date
11/388,645 United States of America 2006-03-24
11/388,644 United States of America 2006-03-24

Abstracts

English Abstract

Fracturing fluids comprising a base fluid and substantially hydrated cement particulates. Methods of fracturing a subterranean formation comprising fracturing the subterranean formation so as to create or enhance one or more fractures in the subterranean formation; introducing a fracturing fluid comprising a base fluid and substantially hydrated cement particulates into the one or more fractures; and depositing at least a portion of the substantially hydrated cement particulates in the one or more fractures in the subterranean formation. Methods of gravel packing comprising providing a gravel packing fluid comprising a base fluid and substantially hydrated cement particulates, introducing the gravel packing fluid into a subterranean formation, and depositing at least a portion of the substantially hydrated cement particulates in the subterranean formation so as to form a gravel pack. Gravel packing fluids that comprise a base fluid, and gravel comprising substantially hydrated cement particulates.


French Abstract

L'invention concerne des fluides de fracturation comprenant un fluide de base et des matières particulaires de ciment sensiblement hydratées. Elle concerne des procédés de fracturation d'une formation souterraine comprenant la fracturation de la formation souterraine pour créer et améliorer une ou plusieurs fractures dans la formation souterraine ; l'introduction d'un fluide de fracturation comprenant un fluide de base et des matières particulaires de ciment sensiblement hydratées dans la ou les fractures ; et la déposition d'au moins une partie des matières particulaires de ciment sensiblement hydratées dans la ou les fractures dans la formation souterraine. Elle concerne également des procédés de filtre à gravier consistant à fournir un fluide de filtre à gravier comprenant un fluide de base et des matières particulaires de ciment sensiblement hydratées, la déposition du fluide de filtre à gravier dans une formation souterraine, et la déposition d'au moins une partie des matières particulaires de ciment sensiblement hydratées dans la formation souterraine pour constituer un filtre à gravier. L'invention concerne des fluides de filtre à gravier comprenant un fluide de base, et un gravier comprenant des matières particulaires de ciment sensiblement hydratées.

Claims

Note: Claims are shown in the official language in which they were submitted.




9


What is claimed is:

1. A fracturing or gravel packing fluid comprising:
a base fluid; and
substantially hydrated cement particulates.

2. The fluid of claim 1 wherein the base fluid is selected from the group
consisting of water, an aqueous gel, a viscoelastic surfactant gel, an oil
gel, a gas, a liquefied
gas, a liquified hydrocarbon, an emulsion, and combinations thereof.

3. The fluid of claim 1 wherein the substantially hydrated cement
particulates comprise an admixture.

4. The fluid of claim 3 wherein the admixture comprises at least one
material selected from the group consisting of a fluid loss control additive,
a surfactant, a salt,
a defoamer, a formation conditioning agent, an expanding additive, a flow
enhancing
additive, an acid, a corrosion inhibitor, a crosslinking agent, a breaker, a
viscoelastic
surfactant, a friction reducer, a gelling agent, a biocide, an algicide, and
combinations
thereof.

5. The fluid of claim 3 wherein the substantially hydrated cement
particulates are coated with at least one additional admixture.

6. The fluid of claim 1 wherein the substantially hydrated cement
particulates comprise at least material selected from the group consisting of
Portland cement,
a pozzolanic cement, a gypsum cement, a soil cement, a calcium phosphate
cement, a high-
alumina content cement, a silica cement, a high-alkalinity cement, a slag
cement, cement kiln
dust, a zeolite, vitrified shale, and mixtures thereof.

7. The fluid of claim 1 wherein the substantially hydrated cement
particulates are coated with at least one admixture.

8. The fluid of claim 1 wherein the substantially hydrated cement
particulates have an average particle diameter in the range of from about 5
micrometers to
about 2.5 millimeters.




9. The fluid of claim 1 wherein the substantially hydrated cement
particulates are present in the fracturing fluid in an amount up to about 30
pounds per gallon
of the fracturing fluid.

10. The fluid of claim 1 wherein the fluid further comprises an additive
selected from the group consisting of a fluid loss control additive, a lost
circulation material,
a surfactant, a salt, a formation conditioning agent, a defoamer, an acid, a
corrosion inhibitor,
a breaker, a biocide, an algicide, crosslinking agent, gelling agent,
viscoelastic surfactant,
friction reducer, an expanding additive, a flow enhancing additive, and
combinations thereof.
11. The fluid of claim 1 wherein the fluid is foamed.

12. A method of fracturing a subterranean formation comprising:
fracturing the subterranean formation so as to create or enhance one or
more fractures in the subterranean formation;
introducing a fracturing fluid comprising a base fluid and substantially
hydrated cement particulates into the one or more fractures; and
depositing at least a portion of the substantially hydrated cement
particulates into the one or more fractures in the subterranean formation.

13. The method of claim 12 wherein the base fluid is selected from the
group consisting of water, an aqueous gel, a viscoelastic surfactant gel, an
oil gel, a gas, a
liquefied gas, a liquified hydrocarbon, an emulsion, and combinations thereof.

14. The method of claim 12 wherein the substantially hydrated cement
particulates comprise an admixture.

15. The method of claim 14 wherein the admixture comprises at least one
material selected from the group consisting of a fluid loss control additive,
a surfactant, a salt,
a defoamer, a formation conditioning agent, an expanding additive, a flow
enhancing
additive, an acid, a corrosion inhibitor, a crosslinking agent, a breaker, a
viscoelastic
surfactant, a friction reducer, a gelling agent, a biocide, an algicide, and
combinations
thereof.



11


16. The method of claim 14 wherein the substantially hydrated cement
particulates are coated with at least one additional admixture.

17. The method of claim 12 wherein the substantially hydrated cement
particulates comprise at least material selected from the group consisting of
Portland cement,
a pozzolanic cement, a gypsum cement, a soil cement, a calcium phosphate
cement, a high-
alumina content cement, a silica cement, a high-alkalinity cement, a slag
cement, cement kiln
dust, a zeolite, vitrified shale, and mixtures thereof.

18. The method of claim 12 wherein the substantially hydrated cement
particulates are coated with at least one admixture.

19. The method of claim 12 further comprising the steps of:
providing a settable composition comprising a hydraulic cementitious
material and water;
allowing the settable composition to set into a substantially hydrated
mass; and
comminuting the substantially hydrated mass into smaller particles so
as to form the substantially hydrated cement particulates.

20. The method of claim 19 wherein the settable composition further
comprises an admixture so that the substantially hydrated cement particulate
comprises an
admixture.

21. The method of claim 12 wherein the substantially hydrated cement
particulates have an average particle diameter in the range of from about 5
micrometers to
about 2.5 millimeters.

22. The method of claim 12 wherein the substantially hydrated cement
particulates are present in the fracturing fluid in an amount up to about 30
pounds per gallon
of the fracturing fluid.

23. The method of claim 12 wherein the fracturing fluid is foamed.
24. A method of gravel packing comprising:



12


providing a gravel packing fluid comprising a base fluid and substantially
hydrated cement particulates;
introducing the gravel packing fluid into a subterranean formation; and
depositing at least a portion of the substantially hydrated cement
particulates
into the subterranean formation so as to form a gravel pack.

25. The method of claim 24 wherein the base fluid is selected from the group
consisting of water, an aqueous gel, a viscoelastic surfactant gel, an oil
gel, a gas, a liquefied
gas, a liquified hydrocarbon, an emulsion, and combinations thereof.

26. The method of claim 24 wherein the substantially hydrated cement
particulates
comprise at least material selected from the group consisting of Portland
cement, a
pozzolanic cement, a gypsum cement, a soil cement, a calcium phosphate cement,
a high-
alumina content cement, a silica cement, a high-alkalinity cement, a slag
cement, cement kiln
dust, a zeolite, vitrified shale, and mixtures thereof.

27. The method of claim 24 wherein the substantially hydrated cement
particulates
are coated with at least one admixture.

28. The method of claim 24 further comprising the steps of:
providing a settable composition comprising a hydraulic cementitious material
and water;
allowing the settable composition to set into a substantially hydrated mass;
and
comminuting the substantially hydrated mass into smaller particles so as to
form the substantially hydrated cement particulates.

29. The method of claim 24 wherein the substantially hydrated cement
particulates
have an average particle diameter in the range of from about 5 micrometers to
about 2.5
millimeters.

30. The method of claim 24 wherein the substantially hydrated cement
particulates
are present in the gravel packing fluid in an amount up to about 30 pounds per
gallon of the
gravel packing fluid.



13


31. The method of claim 24 wherein the gravel packing fluid is foamed.

32. The method of claim 24 wherein the gravel packing fluid is introduced into
an
annulus between a screen and the subterranean formation.

Description

Note: Descriptions are shown in the official language in which they were submitted.



CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016
1

SUBTERRANEAN TREATMENT g'I.,UIIDS COMEPRISIlwTG SUBSTANTIALLY
KYDRATEI) CEMENT PARTICULATES

BACKGROUND
The present invention relates to substantially hydrated cement particulates.
More
particularly, the present invention relates to subterranean treatinent fluids
comprising
substantially hydrated cement particulates and associated methods of use in
subterranean
applications.
Hydraulic fracturing is a process cominonly used to increase the flow of
desirable
fluids, such as oil and gas, from a portion of a subterranean formation.
Hydraulic fracturing
operations generally involve introducing a fracturing fluid into a
subterranean formation at or
above a pressure sufficient to create or enhance one or more fractures in the
fonnation.
Enhancing a fracture includes enlarging a pre-existing fracture in the
fonnation. The
fracturing fluid inay comprise particulates, often referred to as "proppant"
that are deposited
in the fractures. The proppant fimctions to prevent the fractures from fully
closing upon the
release of pressure, fonning conductive channels through which fluids may flow
to (or froin)
the well bore.
Another process that involves the use of particulates is gravel packing. A
"gravel
pack" is a tenn cominonly used to refer to a voh.une of particulate materials
(such as sand)
placed into a well bore to at least partially reduce the migration of
unconsolidated fonnation
particulates into the well bore. Gravel packing operations coininonly involve
placing a gravel
pack screen in the well bore neighboring a desired portion of the subterranean
fonnation, and
packing the surrounding annulus between the screen and the subterranean
fonnation with
particulate materials that are sized to prevent and inhibit the passage of
fonnation solids
through the gravel pack with produced fluids. In some instances, a screenless
gravel packing
operation may be perfonned.
Conventional particulates included as proppant and/or gravel in subterranean
trea.tinent fluids include, but are not liinited to: sand; bauxite; ceramic
materials; glass
lnaterials; polymer materials; Teflon"" inaterials; nut shell pieces; seed
shell pieces; fruit pit
pieces; wood; composite particulates; cured resinous particulates coinprising
nut shell pieces,
seed shell pieces, inorganic fillers, and/or fruit pit pieces; and
coinbinations thereof.
Conventionally, composite particulates that may be used comprise a binder and
a filler


CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016
2
material wherein suitable filler inaterials include silica, alumina, fumed
carbon, carbon black,
graphite, mica, titanium dioxide, meta-silicate, calcium silicate, kaolin,
talc, zirconia, boron,
fly ash, hollow glass microspheres, solid glass, and coinbinations thereof
Sand is a common
particulate utilized in subterranean treatrnent fluids as either proppant or
gravel, but there
may be issues related to supply and cost associated with using sand.
To modify one or more properties of a subterranean treatnlent fluid, various
admixtures may be incl-Lided in the subterranean treatment fluid. As used
herein, the term
"admixture" refers to materials, other than the base fluid used for inalcing
the subterranean
treaftnent fl_uid, which may be added to the subterranean treatinent fluid
before or during its
mixing. Admixtures oftentimes are provided in the fonn of liquids or soluble
solids (e.g.,
powders). Atternpts have been inade to counteract the problems that may be
associated with
the delivery of adinixtures in solid and liquid fonn. For instance, an adniix-
ture provided in
powdered form may become dry compacted, or the adinixture, in another
instance, may be
coated onto a carrier particle. However, iinprovelnents are needed for the
delivery of
adinixtures into subterranean treatinent fluids.
SU1VCVLARY
The present invention relates to substantially hydrated cement particulates.
More
particularly, the present invention relates to subterranean treatinent fluids
comprising
substantially hydrated cement particulates and associated methods of use in
subterranean
applications.

An embodiment of the present invention provides a fracturing fluid that
comprises a
base fluid, and substantially hydrated ceinent particulates.
Anotlier embodiinent of the present invention provides a gravel packing fluid
that
comprises a base flliid, and gravel comprising substantially hydrated cement
particulates.
An embodiment of the present invention provides a method of fracturing a
subterranean forination that comprises fracturing the subterranean fonnation
so as to create or
enhance one or more fractures in the subterranean fonnation; introducing a
fracturing fluid
coinprising a base fluid and substantially hydrated ceinent particulates into
the one or more
fractures; and depositing at least a portion of the substantially hydrated
cenient particulates in
the one or more fractures in the subterranean fonnation.


CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016
Another einbodiment of the present invention provides a method of gravel
packing
that comprises providing a gravel packing fluid coinprising a base fluid and
substantially
hydrated cement particulates, introducing the gravel packing fluid into a
subterranean
formation, and depositing at least a portion of the substantially hydrated
cement particLilates
in the subterranean formation so as to form, a gravel pack.
The features and advantages of the present invention will be readily apparent
to those
skilled in the art upon a reading of the description of the exainple
embodiinents, which
follows.
DESCRIPTION OF PREFERRED FM-BODI1.VIENTS

The present invention relates to substantially hydrated cement particulates.
More
particularly, the present invention relates to subterranean treatinent fluids
colnprising
substantially hydrated cement particulates and associated methods of use in
subterranean
applications. While the substantially hydrated cement particulates of the
present invention
are useful in a variety of applications, they may be particularly useful when
included in
fractLiring fluids as proppant or in gravel paclcing fluids as gravel.
The subterranean treatment fluids of the present invention generally colnprise
a base
fluid and substantially hydrated cement particulates. In some embodiments, the
substantially
hydrated cement particulates may colnprise an admixture. The substantially
hydrated cement
particulates may be included in the subterranean treatment fluid as proppant,
gravel, lost
circulati on inaterials, carriers for admixtures, or combinations thereof.
The base fluids utilized in the subterranean treatment fluids of the present
invention
can be any fhiid suitable for use as a base fluid in fracturing or gravel
packing operations.
Suitable base fluids include, but are not limited to, water, aqueous gels,
viscoelastic
surfactant gels, oil gels, gases, liquefied gases, liquefied hyrdocarbons,
einulsions, and
coinbinations thereof Suitable aqueous gels are generally comprised of water
and one or
more gelling or viscosifying agents. Optionally, the aqueous gel further may
comprise a
crosslinking agent for crosslinking the gelling agent and further increasing
the viscosity of
the fluid. Suitable viscoelastic surfactant gels may coinprise a viscoelastic
surfactant and
water. Suitable emulsions can be colnprised of two immiscible liquids such as
an aqueous
liquid or gelled liquid and a hydrocarbon. Suitable water used in the base
fluids can be fresh
water, salt water (e.g.,, water containing one or lnore salts dissolved
therein), brine (e.g.,


CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016
4

saturated salt water), seawater, or any other aqueous liquid that does not
adversely affect
other coinponents in the subterranean treatment fluid. The base fluid may also
be foained or
unfoained as desired for a particular application and may include, for
exainple, air, carbon
dioxide, and/or nitrogen.
The subterranean treatinent fluids of the present invention further coinprise
substantially hydrated cement particulates. The substantially hydrated cement
particulates
may be forined in any suitable manner. In certain einbodiments of the present
invention, the
substantially hydrated cement particulates present in the subterranean
treatment fluids of the
present invention are formed by providing a settable co?nposition coinprising
a hydraulic
cementitious material and water; allowing the settable coinposition to set
into a substantially
hydrated mass; and comminuting the substantially hydrated mass into smaller
particles so as
to form the substantially hydrated cement particulates used in the methods of
the present
invention. In another einbodiment, the settable coinposition further may
coznprise an
admixture. By including an admixture in the settable composition, the
substantially hydrated
cement particulates fonned using this settable cornposition should comprise
the admixture.
In another embodiment, after colnminution of the substantially hydrated mass
into the
substantially hydrated celnent particulates, the substantially hydrated cement
particulates may
be coated with at least one admixture. This permits the coinbination of
adtnixtures that may
not be coinpatible when used in solution. An example method for producing the
substantially
hydrated cement particulates andlor intermixing the admixtures therein is
described in U.S.
Patent No. 6,648,962, the disclosLU-e of which is incorporated herein by
reference.
Comminution of the substantially hydrated mass to fonn the substantially
hydrated
cement particulates may be accomplished by any of a variety of suitable
metllods. For
exalnple, corruninution may be achieved by subjecting the substantially
hydrated mass to
colnpressive or grinding forces, such as by using a jaw crusher, a roller
crusher (e.g., opposed
steel rollers), a ball mill, a disk inill, or a grinder. After cornininution,
the substantially
hydrated cement particulates inay be highly granulate with a high surface
area, thereby
providing a high loading surface.
The size of the substantially hydrated cement particulates may vary based upon
the
desired application. In certain embodiments, the substantially hydrated cement
particulates
may have an average diameter in the range of from about 5 micrometers to about
2.5
milliineters. However, it should be understood that, in other embodiinents,
the substantially


CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016

hydrated ceinent particulates may have an average diaineter of greater than
about 2.5
millimeters or of less than about 5inicrometers as desired. One of ordinary
skill in the art
with the benefit of this disclosure will know the appropriate size, of
particulates for a
particular application.
Generally, the hydraulic ceinentitious material used to form the substantially
hydrated
cement particulates may be any hydraulic ceinentitious material that is
suitable for use in
cementing operations. A variety of hydraulic ceinentitious materials are
suitable for use,
including those colnprised of calciuin, aluminuin, silicon, oxygen, and/or
sulfur, which set
and harden by reaction with water. Such hydraulic cementitious materials
include, but are
not limited to, Portland ceinents, pozzolanic celnents, gypsum ceinents, soil
cements, calciurn
phosphate cements, high-alumina content cements, silica ceinents, high-
alkalinity cements,
slag cements, ceinent lciln dust, or mixtures thereof. "Cement kiln dust," as
that terin is used
herein, refers to a partially calcined kiln feed which is typically relnoved
from the gas stream
and collected in a dust collector during the inanufacture of cement. The
chemical analysis of
cement kiln dust from various celnent manufactures varies depending on a
number of factors,
including the particular kiln feed, the efficiencies of the cement production
operation, and the
associated dust collection systeins. Cenzent kiln dust generally may comprise
a variety of
oxides, such as Si02, A1203, Fe203, CaO, MgO, SO3, Na20, and K20.
Vitrified shale also may be used to fonn the substantially hydrated cement
particulates. Among other things, in some embodilnents, vitrified shale inay
be included in
the settable coinpositions used to fonrn the substantially hydrated cement
particulates. Such
vitrified shale may react with lime present in, or added to, the settable
coinposition to fonn a
suitable cementing material, for exanple, calcium silicate hydrate. A variety
of vitrified
shales are suitable, including those comprising silicon, aluminum, calcitiun,
and/or
magnesium. Suitable exanples of vitrified shale include, but are not limited
to, PRESSUR-
SEAL`g' FINE LCM material and PRESSUR-SEAL' COARSE LCM inaterial, which are
comniercially available froin TXI Energy Services, Inc., Houston, Texas.
The water utilized to fonn the substantially liydrated cement particulates can
be fresh
water, salt water (e.g., water containing one or more salts dissolved
therein), brine (e.g.,
saturated salt water), or seawater. Generally, the water can be from any
source, provided that
it does not adversely affect other coinponents in the settable composition.
The water may be
present in an ainount sufficient to forin a puinpable slurry. In certain
exeinplary


CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016
6

elnbodiments, the water is present in the settable compositions of the present
invention in an
amount in the range of from about 30% to about 180% by weight of the hydraulic
cementitious material. In certain einbodirnents, the water may be added to the
hydraulic
ceinentitious material, a.d.mixture(s), or both. In another ernbodiment, the
water may be
incorporated in an aqueous dispersion, emulsion, or solution containing the
admixture(s).
In certain embodiments of the present invention, the substantially hydrated
cement
particulates ftirther may coinprise a zeolite. Zeolites generally are porous
ahunino-silicate
minerals that may be either a natural or synthetic material. Synthetic
zeolites are based on
the same type of structural cell as natural zeolites, and may comprise
aluminosilicate
hydrates. As used herein, the tenn "zeolite" refers to all natural and
synthetic fonns of
zeolite.
In certain embodilnents of the present invention, the substantially hydrated
cement
particulates further inay coinprise an admixture. Among other things, this
provides for the
delivery of admixture(s) into a subterranean treatment fluid, for exalnple,
when the
substantially hydrated cement particulates coinprising an adinixture are added
to a settable
composition. The adznixture(s) may be provided as soluble solids (e.g.,
powders) or liquids.
Any admixture commonly used in fracturing or gravel packing flLUds may be
included in the
settable compositions. A wide variety of adinixtures may be included in the
subterranean
treatinent fluid, including, but not limited to, fluid loss control additives,
surfactants, salts,
defoa.mers, fonnation conditioning agents, expanding additives, flow enhancing
additives,
acids, corrosion inhibitors, breakers, crosslinking agents, viscoelastic
surfactants, friction
reducers, gelling agents, biocides, algicides, coinbinations thereof, and the
like. One skilled
in the art with the benefit of this disclosure will know the type of admixture
to include for a
particular application.
In certain einbodilnents of the present invention, after coinminution of the
substantially hydrated mass into the substantially hydrated ceinent
particulates, the
substantially hydrated cement particulates may be coated with at least one
admixture. The
coating of the adinixture(s) onto the substantially hydrated ceinent
particulates may be
applied using any suitable coating method.
The ainount of admixture or admixtures to include in the settable
coinpositions, coat
onto the substantially hydrated cement particulates, or both, should depend,
iwer alia, on the
desired ainount of the admixture(s) to incorporate into the subterranean
treatinent fluid. The


CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016
7

desired ainount of the admixture(s) to incorporate into the subterranean
treatment fluid may
depend, inter alia, on the type of admixture(s) employed. Generally, the
adrnixture(s) may be
included in the settable coinposition in an adinixture(s)-to-hydraulic
cementitious material
weight ratio in the range of from about 5:95 to about 95:5. One of ordinary
skill in the art
with the benefit of this disclosure will know the appropriate a.inount of the
adinixti.ire(s) to
include in the settable composition for a particular application.
Ainong other things, the methods of the present invention may provide for the
accurate measurement of the amount of the adinixture(s) added to subterranean
treatinent
fluids as well as avoiding time-consuming labor, energy costs, and processing
complexity
that may be associated with conventional methods for the delivery of admixtLU-
es into
subterranean treatinent fluids. An accurate measurement of the amount of
adinixture(s) in the
subterranean treatment fluid may be obtained whether the admixture(s) is added
to a settable
composition, coated onto the substantially hydrated ceinent particulates, or
both. For
example, the alnount of the ad.inixture(s) introduced into the subterranean
treatinent fluid inay
be obtained by measuring the bulk weight of the substantially hydrated cement
particulates
and the relative amount of admixtures.
Typically, the substantially hydrated cement particulates may be included in a
subterranean treatment fluid of the present invention in an amount sufficient
for a particular
application. In some embodiments, the substantially hydrated cement
particulates are present
in an ainount up to about 30 pounds per gallon (ppg). In some embodiments, the
substantially hydrated cement particulates are present in an amount up to
about 23. ppg. In
some embodiments, the substantially hydrated ceinent particulates are present
in an amount
up to about 12 ppg. One of ordinary skill in the art, with the benefit of this
disclosure, will
recognize the appropriate substantially hydrated cement particulates
concentration of the
subterranean treatinent fluids for a chosen application.
Furtllerinore, additional additives may be added to the subterranean treatment
fluids
of the present invention as deein.ed appropriate by one skilled in the art.
Examples of such
additives include, but are not limited to, fluid loss control additives, lost
circulation materials,
surfactants, salts, fonnation conditioning agents, defoainers, acids,
corrosion inhibitors,
breakers, biocides, algicides, crosslinlcing agents, gelling agents,
viscoelastic surfactants,
friction reducers, expanding additives, flow enhancing additives,
coinbinations thereof, and
the lilce.


CA 02642930 2008-08-20
WO 2007/110591 PCT/GB2007/001016
8

In one einbodiment, the present invention provides a inethod of using a
fracturing
fluid in a subterranean formation colnprising: fracturing the subterranean
forma.tion so as to
create or enhance one or more fractures in the subterranean fon.nation;
introducing a
fracturing fluid comprising a base fluid and substantially hydrated cement
particulates into
the one or more fractures; and depositing at least a portion of the
substantially hydrated
ceinent particulates in the one or more fractures in the subterranean
fonnation. The
substantially hydrated ceinent particulates deposited in the one or more
fractures should prop
the fractures so as to prevent thein from fully closing. In some
embodi.inents, hydrocarbons
ina.y be produced froln the subterranean formation through the one or more
fractures.
In one elnbodiment, the present invention provides a method of gravel packing
coinprising: providing a gravel packing fluid comprising a base fluid and
substantially
hydrated cement particulates; introducing the gravel packing fluid into a
subterranean
formation; and depositing at least a portion of the substantially hydrated
cement particulates
in the subterranean formation so as to form a gravel pack. In soine embodiment
the gravel
packing fluid may be introduced into an annulus between a screen and the
subterranean
formation. In some embodiments, hydrocarbons may be produced from the
subterranean
formation through the gravel pack.
Therefore, the present invention is well adapted to carry out the objects and
attain the
ends and advantages mentioned as well as those which are inherent therein.
While nuinerous
changes inay be made by those skilled in the art, such changes are encompassed
within the
spirit of this invention as defined by the appended claims.

Representative Drawing

Sorry, the representative drawing for patent document number 2642930 was not found.

Administrative Status

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Administrative Status

Title Date
Forecasted Issue Date Unavailable
(86) PCT Filing Date 2007-03-21
(87) PCT Publication Date 2007-10-04
(85) National Entry 2008-08-20
Examination Requested 2008-08-20
Dead Application 2011-03-21

Abandonment History

Abandonment Date Reason Reinstatement Date
2010-03-22 FAILURE TO PAY APPLICATION MAINTENANCE FEE
2010-09-20 R30(2) - Failure to Respond

Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Request for Examination $800.00 2008-08-20
Application Fee $400.00 2008-08-20
Maintenance Fee - Application - New Act 2 2009-03-23 $100.00 2008-08-20
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
HALLIBURTON ENERGY SERVICES, INC.
Past Owners on Record
RODDY, CRAIG W.
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

To view selected files, please enter reCAPTCHA code :



To view images, click a link in the Document Description column. To download the documents, select one or more checkboxes in the first column and then click the "Download Selected in PDF format (Zip Archive)" or the "Download Selected as Single PDF" button.

List of published and non-published patent-specific documents on the CPD .

If you have any difficulty accessing content, you can call the Client Service Centre at 1-866-997-1936 or send them an e-mail at CIPO Client Service Centre.


Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Abstract 2008-08-20 1 65
Claims 2008-08-20 5 206
Description 2008-08-20 8 553
Cover Page 2008-12-18 1 42
Prosecution-Amendment 2010-03-18 2 66
PCT 2008-08-20 2 65
Assignment 2008-08-20 5 146