CA2095605A1 - Additive for a drilling fluid - Google Patents
Additive for a drilling fluidInfo
- Publication number
- CA2095605A1 CA2095605A1 CA 2095605 CA2095605A CA2095605A1 CA 2095605 A1 CA2095605 A1 CA 2095605A1 CA 2095605 CA2095605 CA 2095605 CA 2095605 A CA2095605 A CA 2095605A CA 2095605 A1 CA2095605 A1 CA 2095605A1
- Authority
- CA
- Canada
- Prior art keywords
- drilling fluid
- additive
- oxide
- additive according
- drilling
- 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.)
- Abandoned
Links
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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
-
- 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
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Abstract
An additive for a drilling fluid, comprising a composition which is at least dispersible in said drilling fluid at ambient temperatures, and has a solubility in said drilling fluid at drilling temperatures which is lower than the solubility at said ambient temperatures. The composition, when dispersed in water, has a higher affinity than water for the surface of a rock being drilled.
Description
~O 92/07919 2 ~ ~ ~ G O ~ PCTtGB91/01944 aE~ a ~rrx~_~D
m is invention relates to a ~ Ltive~ for drillirrJ fluLd~.
Drilliny fluids are clrculat~l d~wn ~he w~llhor~ beln~
drilled during well drilling operations. 'l~e fluid i~ usually pu~p~d down the ixside of the ~rillpipe and then passes through the drill bit into the wellbore. qhe fl~ returns to the surfa oe throu3h the annulus defined ketween the exterior of *he drillpipe an~ the wellbore. The fluid is t~len reoovered, processed and reused.
Drilling fluids are desirabls in order to lubricate the drill bit, to cool the drill bit, and to remove rock cuttings generated.
Ihe physical properties of the drilling fluid (su~h as viscosity/ density, salinity and filtrate loss) can be modified as One problem that occurs with water based drilling fluids is hvdration of the rock being drilled. Ihis probl~m is particularly acute when the ro~k includes clays and s~les.
Clays and shales display a great ~ffinity for water.
Absorption of water leads to swelling ol the clay or shale and the resulting stresses can le~d to f ~lure. ~LS, when ~he rock has been hydrated it can be subject to strlcdhr~iL ~ailure, and can col ~ e into ~he wellbore. This ca~P~ wellbore ~ nsion, and can cause the dril7pipe to beccme stuck.
O~e solution to this problem inNolve~ thQ use o~ oll based drilling ~lui~s, which are usuaLLy ~ormiLated with m~l~n~L oil3.
Althou3h thse ~luids gen~Lly co ~ n water, it is tightly emulsifisd using pcwe~i~iL sur~actants. Such ~luids are oubctan*ially mert to hydratable rocks.
Su~h oil based drilling fluids are expensive kut have been use~ extRnsively, particularly in the Morth Sea area. However, dNe ~o environmental problems they are being used less extensively.
Another solution to the problem involvcs the use of water bQscd drilling fluids ~hidh Lnocrpcrate additives havlnq sur~ace active properties; such additive~ ar~ eorbed onto the rock, rçducing " , ' W O 92/07919 2 0 3 ~ PCT/GB91/019~4 f the access of water, and thereb~ reducing the rate of hydration.
Anionic, cationic and nonionic matexials ~re used, because dif~erence parts of a rock struc~ure show di~ere~t a~inities to differe~t ionic charg~. s EXamples of known additives ~or reducing hydration include:
potassium chloride, partially hydrolysed polyacrylamides (PffPA);
gilsonite; pol~glycerols; carbcxymethyloe llulose deriva~ives, such as polyanionic cellulose; calcium chloride; and ~cdium silicate.
Potassium chloride combined with PHPA has been widely used, despite ~he high c06ts and the dif~iculty in using the materials.
Cationic Materials can b~ highly e~fective but tend to ~e incompa~ible with other additives (mostly anionic) u~3d in water based drilling fluids.
Ihere exists a need for an effective addi~ive for use with water kased drilllng fluids, which additive is campatible with the other co~po~ents of dr;l-ing ~luids.
~cocdin~ to one a~ of the present invention thQre is pravided an additiv~ fc~-a drilling fluidl, n~rising a ~5itiall which is at least dispersible in said drilling fluid at a~bient temper~tures, and has a solubility in said drilling fluid at drilling temperatures which is lo~er th~n the solubility at said ambient t~mperatures, and said OO~pO6itiOIl, when dispersed in water, has a higher affinity than water for the sur~ace o~ a rock b~mg drilled.
- ~.Advantageously said co~positio.n is sub6tan¢ially insoluble in said drilling fluid at said drilling temperatures; and is soluble at ambient t ~ tures. A~bient te~pexatures wculd ge~erally be ~rom 0 to 50& typically 0 to 30. qhe upper end o~ th~ range is only likely to be reache~ in desert areas.
Drilling temperatures may be ~ g from ambi~.L up to 200 & or mcre. A typical "kottom hole" temperature in the North Sea w~uld be abcut ~20C.
qh~s, the additive a~cordlng to the invention wilL readily ~mix with the fluid at ambient tenperatures, but will cc~e out o~ ~
solution at drilling te~peratures and attach itsel~ to the rock, " .
'.` ~O 92/07919 2 ~ 9 J ~ !J ~ PCT/CB91/01944 thereby protectiny the rock frcm hydrat:ion by water in th~ drilling fluid.
Preferably the comçosition oompri~es a polym~r con~aining aIkylene oxide repeat mg units.
It is particularly preferred that the alkylene oxide inclu~s ethylene oxlde and/or propylene oxide.
~ he poly~er may ahvan~ageously be selected from the group consisting of:
An ethylene oxide/prcpylene oxide blocX copolymer; a ` polyalkylene cxide-modified polymethyl siloxane; a polyalkylene oxide modi~ied polyamine, alcohol or glycerine; an~ polyprcpylene glyool.
It is preferable that the polymer conta m s S to 75 wk%
ethylene oxide and 25 to 95 wt% prcpylene oxide, more pre~erably 5 to 50 wt% e~hylene o~ide and 50 to 95 wt% prcpylene oKide.
Desirably the molecular weight of the polymer is g~eater than 1000.
A paxticularly effective polyalky].ene oxide n~dified diamine is available, under the registered trade mark SEPAEASE 31. Ihis material is available frcm BASF.
; A particularly effe~tive polyalkylene cxide n~dified alcc~ol is available under the registered trade! mark BP 75W 18000. Ihis material is available LLam BP and is disclosed in a BP publication relatinq t~ ERE~X polyalkylene glyucol flt~ an~ lubricants.
Some of thQ a~ditives according to the invention also provide excellent lubricity characteristics, particularly the ethylene oxide/prcQylene oxide block copolymers.
~. ~ to ansthcr aspect of the ~ on there i~
provid2d the use in thQ wellbore drilling o~ a 3LL~tum, o~ a saturated or unsaturated aqueous 601ution o~ a s=bctonce whlch exhibits a critical solution temperature between ambient temperature and the service te~perature at the stratum.
The ~ub~tanD~ may cumpri~e an additive having any oambination of ~he ~eatures o~ the ~ tive descr~bed above.
The invention will n~l be further d~scrib3d with reference to the follawing e3s~pl~;.
, ~
, .. .. ........ . . ... . . . . . ..
W 0 92/07919 2 0 9 S 6 0 ~ PC~/CB9l/~l')44 ,.-~
CcmparatiVe E~a~E~e~-l A test was devised to establi.sh a relat.ive measure o~ shale stabilisation performance ~or varicus dr:Llling ~lul~L~ he t~st inv~lved static storage of 250 - 1000 micron sLeved raw be~tonite ~are in the fluid un~er test ~or 16 hour.s at ~0C. ~terwards the be~tonite was washed with a solution o~ 10% potassium chloride in tap water, and then resieved. Ihe test was cæried out twioe f~ar each flllid (tes* A and test B), and the rr~sults are summ~rlsed in Table 1.
Example 1 Ihe test o~ comparative e ~ le 1 was carried GUt with a drilling fluid oonsisting of seawater mixed with 1% ky weight of a ~luid acGording to the present i~vention. The test was carried GUt twioe for each fluid (test C and test D) and the results are summarised in qable 2.
EXample 2 Ihe test of example 1 was repeat~d using 5% ~y weight of ~dlitive, instead of 1%. The test was ca~ried out twi oe for each ~luid t~est E and test F) and the results are summaris~d in Table 3.
In co~çaratiYe example l~ and examples 1 and 2, swelling ~ to particle ~;~integration and weight ln~, althsu3h in scme cases aksorbance can lead to a weight ~ e. The results from examples 1 and 2 ~hcw that use o~ 5 wt% of the additive accGrding tD
the i~vention, rather than 1 wt%, may lead to a siqnificant ~ impccvem=rt in inhibition only wlth certain additions and that : ~- performance may be cpkimized by suitable material selection.
~ - Cbnparative Ex3m~le 2 - : - ~ ative example 3 ~a5 repeated for three prior art A~;tiv~s, using a dif~erent bentonite ore part~le slze o~ 1.0 to 2.0 mm~
The te5t5 were repeated twice for each fluid (tests G an~ H), and the result5 are summæi~ed in Table 4.
,". .,, , " I
~ 92/07919 2 ~ 9 ~ ~ Q ~ PCI'/C-B91/01~44 Comparative example 2 was repeated, each drilling fluid al~o be m g mixed with an additiv~ aocording to the invention, as well as the priar art additive.
The tests were repeated twice 2cr each 21uid ~tests I and J), and the results are summarised in Table 5.
A ccmparison of Table 5 wi~h Table 4 shows that the addition of additives according to the invention to the drilling ~luid c~n cause a significan~ reduction in weight lo~s, even when the drilling fluid already contains other additives.
T~BLE 1~ RÆsults of Ccmparative ExamPle 1 TEgr A T~ B
~ g6 Weiqht C~ar~e g6 W~iaht ~e Seawate~r. -25. 4 -26 . 2 Ben~cnite/PAC (polyanionic oe llulo6e)/Seawater. -23.5 -24.4 Oil ba~e mud (low aromatic mineral oil). ~5.9 +4.3 Xanthan gum salt saturated (Sodiurn *~laride) . -6 . 5 -6 . 8 PAC/35ppD P~t~ssium chl~ide/
Seawa~. -8 . 4 -9 . 7 20~ H~100 (Hydrafluids polyglycer~ls)/Seawater.+7.5 -~9.6 5% ~E100 -25.0 -2~.5 1% ~E100 -30.0 -32.0 ..:
. I
:' ' ' W O 92/07919 2 ~ 9 5 6 0 ~ PC~/GB91/~1944 ~--~
~BLE 2: Resul~s o~ E~@~ElQl TES~ C IESr D
ADDrTIVE ~ igh~ t-k~gLe 3~r~gh~_Ç$~yge Sepabase A31. -15.9 -13.3 Silwet ~7500. -g.4 -13.5 BP 75 W 18000. -9.2 -1~.5 PE 3100. -2.6 -9.2 30 C 05. -10.4 -12.2 Silwet L 7001. -6.3 P400 -17.4 -1~.6 : l~E1E 3: RRsults o~ E~ample 2 ADDITTVE TEST E IEST F
; % Weiqht Chanae % Weioht Chanae Sepabase A31 + 9.4 +10.0 Silwet L7500 ~40.4 ~49.2 BP 75 W 18000 -1.8 -1.3 PE 3100 -7.0 -11.4 30C05 -9.8 -10.6 SILWEr L7001 +12.0 ~15.5 p400 -13.3 -13.9 I~KLE 4: Results o~ comParative Example 2 TESr G ~EST H
FIUID~ Weioht Chanqe 3 ~ e Seawater. -83.0 -81.0 Ebntonite/PA~/seawater. -64.0 -60.0 Xanthan gum/6eawatcr. -34.0 -35,0 -- NO 92~07919 2 ~ 9 .~ ~ O a PCT/(JB91/01944 l~BIE 5: ~esults of Examp].e 3 TESr I TEST J
FLUID % Weiqht Chanqe% Wbi~ht Chanqe As Eentonite/PAC/seawater In comparative example 2 + 5% PE 310 -29.0 -ll.0 As Bentonite/PAC/ssawater In comparative example 2 ~ 5% Silwet 720. -2.0 o.o As a~chan g~n/seawa~
In compara~ive example 2 + 2.8% Sil~et 720. -l2.O -6.0 As Xa~than gum/seawater In oomparative example 2 + 2.2% PE 3100. -16.0 -~16.
m is invention relates to a ~ Ltive~ for drillirrJ fluLd~.
Drilliny fluids are clrculat~l d~wn ~he w~llhor~ beln~
drilled during well drilling operations. 'l~e fluid i~ usually pu~p~d down the ixside of the ~rillpipe and then passes through the drill bit into the wellbore. qhe fl~ returns to the surfa oe throu3h the annulus defined ketween the exterior of *he drillpipe an~ the wellbore. The fluid is t~len reoovered, processed and reused.
Drilling fluids are desirabls in order to lubricate the drill bit, to cool the drill bit, and to remove rock cuttings generated.
Ihe physical properties of the drilling fluid (su~h as viscosity/ density, salinity and filtrate loss) can be modified as One problem that occurs with water based drilling fluids is hvdration of the rock being drilled. Ihis probl~m is particularly acute when the ro~k includes clays and s~les.
Clays and shales display a great ~ffinity for water.
Absorption of water leads to swelling ol the clay or shale and the resulting stresses can le~d to f ~lure. ~LS, when ~he rock has been hydrated it can be subject to strlcdhr~iL ~ailure, and can col ~ e into ~he wellbore. This ca~P~ wellbore ~ nsion, and can cause the dril7pipe to beccme stuck.
O~e solution to this problem inNolve~ thQ use o~ oll based drilling ~lui~s, which are usuaLLy ~ormiLated with m~l~n~L oil3.
Althou3h thse ~luids gen~Lly co ~ n water, it is tightly emulsifisd using pcwe~i~iL sur~actants. Such ~luids are oubctan*ially mert to hydratable rocks.
Su~h oil based drilling fluids are expensive kut have been use~ extRnsively, particularly in the Morth Sea area. However, dNe ~o environmental problems they are being used less extensively.
Another solution to the problem involvcs the use of water bQscd drilling fluids ~hidh Lnocrpcrate additives havlnq sur~ace active properties; such additive~ ar~ eorbed onto the rock, rçducing " , ' W O 92/07919 2 0 3 ~ PCT/GB91/019~4 f the access of water, and thereb~ reducing the rate of hydration.
Anionic, cationic and nonionic matexials ~re used, because dif~erence parts of a rock struc~ure show di~ere~t a~inities to differe~t ionic charg~. s EXamples of known additives ~or reducing hydration include:
potassium chloride, partially hydrolysed polyacrylamides (PffPA);
gilsonite; pol~glycerols; carbcxymethyloe llulose deriva~ives, such as polyanionic cellulose; calcium chloride; and ~cdium silicate.
Potassium chloride combined with PHPA has been widely used, despite ~he high c06ts and the dif~iculty in using the materials.
Cationic Materials can b~ highly e~fective but tend to ~e incompa~ible with other additives (mostly anionic) u~3d in water based drilling fluids.
Ihere exists a need for an effective addi~ive for use with water kased drilllng fluids, which additive is campatible with the other co~po~ents of dr;l-ing ~luids.
~cocdin~ to one a~ of the present invention thQre is pravided an additiv~ fc~-a drilling fluidl, n~rising a ~5itiall which is at least dispersible in said drilling fluid at a~bient temper~tures, and has a solubility in said drilling fluid at drilling temperatures which is lo~er th~n the solubility at said ambient t~mperatures, and said OO~pO6itiOIl, when dispersed in water, has a higher affinity than water for the sur~ace o~ a rock b~mg drilled.
- ~.Advantageously said co~positio.n is sub6tan¢ially insoluble in said drilling fluid at said drilling temperatures; and is soluble at ambient t ~ tures. A~bient te~pexatures wculd ge~erally be ~rom 0 to 50& typically 0 to 30. qhe upper end o~ th~ range is only likely to be reache~ in desert areas.
Drilling temperatures may be ~ g from ambi~.L up to 200 & or mcre. A typical "kottom hole" temperature in the North Sea w~uld be abcut ~20C.
qh~s, the additive a~cordlng to the invention wilL readily ~mix with the fluid at ambient tenperatures, but will cc~e out o~ ~
solution at drilling te~peratures and attach itsel~ to the rock, " .
'.` ~O 92/07919 2 ~ 9 J ~ !J ~ PCT/CB91/01944 thereby protectiny the rock frcm hydrat:ion by water in th~ drilling fluid.
Preferably the comçosition oompri~es a polym~r con~aining aIkylene oxide repeat mg units.
It is particularly preferred that the alkylene oxide inclu~s ethylene oxlde and/or propylene oxide.
~ he poly~er may ahvan~ageously be selected from the group consisting of:
An ethylene oxide/prcpylene oxide blocX copolymer; a ` polyalkylene cxide-modified polymethyl siloxane; a polyalkylene oxide modi~ied polyamine, alcohol or glycerine; an~ polyprcpylene glyool.
It is preferable that the polymer conta m s S to 75 wk%
ethylene oxide and 25 to 95 wt% prcpylene oxide, more pre~erably 5 to 50 wt% e~hylene o~ide and 50 to 95 wt% prcpylene oKide.
Desirably the molecular weight of the polymer is g~eater than 1000.
A paxticularly effective polyalky].ene oxide n~dified diamine is available, under the registered trade mark SEPAEASE 31. Ihis material is available frcm BASF.
; A particularly effe~tive polyalkylene cxide n~dified alcc~ol is available under the registered trade! mark BP 75W 18000. Ihis material is available LLam BP and is disclosed in a BP publication relatinq t~ ERE~X polyalkylene glyucol flt~ an~ lubricants.
Some of thQ a~ditives according to the invention also provide excellent lubricity characteristics, particularly the ethylene oxide/prcQylene oxide block copolymers.
~. ~ to ansthcr aspect of the ~ on there i~
provid2d the use in thQ wellbore drilling o~ a 3LL~tum, o~ a saturated or unsaturated aqueous 601ution o~ a s=bctonce whlch exhibits a critical solution temperature between ambient temperature and the service te~perature at the stratum.
The ~ub~tanD~ may cumpri~e an additive having any oambination of ~he ~eatures o~ the ~ tive descr~bed above.
The invention will n~l be further d~scrib3d with reference to the follawing e3s~pl~;.
, ~
, .. .. ........ . . ... . . . . . ..
W 0 92/07919 2 0 9 S 6 0 ~ PC~/CB9l/~l')44 ,.-~
CcmparatiVe E~a~E~e~-l A test was devised to establi.sh a relat.ive measure o~ shale stabilisation performance ~or varicus dr:Llling ~lul~L~ he t~st inv~lved static storage of 250 - 1000 micron sLeved raw be~tonite ~are in the fluid un~er test ~or 16 hour.s at ~0C. ~terwards the be~tonite was washed with a solution o~ 10% potassium chloride in tap water, and then resieved. Ihe test was cæried out twioe f~ar each flllid (tes* A and test B), and the rr~sults are summ~rlsed in Table 1.
Example 1 Ihe test o~ comparative e ~ le 1 was carried GUt with a drilling fluid oonsisting of seawater mixed with 1% ky weight of a ~luid acGording to the present i~vention. The test was carried GUt twioe for each fluid (test C and test D) and the results are summarised in qable 2.
EXample 2 Ihe test of example 1 was repeat~d using 5% ~y weight of ~dlitive, instead of 1%. The test was ca~ried out twi oe for each ~luid t~est E and test F) and the results are summaris~d in Table 3.
In co~çaratiYe example l~ and examples 1 and 2, swelling ~ to particle ~;~integration and weight ln~, althsu3h in scme cases aksorbance can lead to a weight ~ e. The results from examples 1 and 2 ~hcw that use o~ 5 wt% of the additive accGrding tD
the i~vention, rather than 1 wt%, may lead to a siqnificant ~ impccvem=rt in inhibition only wlth certain additions and that : ~- performance may be cpkimized by suitable material selection.
~ - Cbnparative Ex3m~le 2 - : - ~ ative example 3 ~a5 repeated for three prior art A~;tiv~s, using a dif~erent bentonite ore part~le slze o~ 1.0 to 2.0 mm~
The te5t5 were repeated twice for each fluid (tests G an~ H), and the result5 are summæi~ed in Table 4.
,". .,, , " I
~ 92/07919 2 ~ 9 ~ ~ Q ~ PCI'/C-B91/01~44 Comparative example 2 was repeated, each drilling fluid al~o be m g mixed with an additiv~ aocording to the invention, as well as the priar art additive.
The tests were repeated twice 2cr each 21uid ~tests I and J), and the results are summarised in Table 5.
A ccmparison of Table 5 wi~h Table 4 shows that the addition of additives according to the invention to the drilling ~luid c~n cause a significan~ reduction in weight lo~s, even when the drilling fluid already contains other additives.
T~BLE 1~ RÆsults of Ccmparative ExamPle 1 TEgr A T~ B
~ g6 Weiqht C~ar~e g6 W~iaht ~e Seawate~r. -25. 4 -26 . 2 Ben~cnite/PAC (polyanionic oe llulo6e)/Seawater. -23.5 -24.4 Oil ba~e mud (low aromatic mineral oil). ~5.9 +4.3 Xanthan gum salt saturated (Sodiurn *~laride) . -6 . 5 -6 . 8 PAC/35ppD P~t~ssium chl~ide/
Seawa~. -8 . 4 -9 . 7 20~ H~100 (Hydrafluids polyglycer~ls)/Seawater.+7.5 -~9.6 5% ~E100 -25.0 -2~.5 1% ~E100 -30.0 -32.0 ..:
. I
:' ' ' W O 92/07919 2 ~ 9 5 6 0 ~ PC~/GB91/~1944 ~--~
~BLE 2: Resul~s o~ E~@~ElQl TES~ C IESr D
ADDrTIVE ~ igh~ t-k~gLe 3~r~gh~_Ç$~yge Sepabase A31. -15.9 -13.3 Silwet ~7500. -g.4 -13.5 BP 75 W 18000. -9.2 -1~.5 PE 3100. -2.6 -9.2 30 C 05. -10.4 -12.2 Silwet L 7001. -6.3 P400 -17.4 -1~.6 : l~E1E 3: RRsults o~ E~ample 2 ADDITTVE TEST E IEST F
; % Weiqht Chanae % Weioht Chanae Sepabase A31 + 9.4 +10.0 Silwet L7500 ~40.4 ~49.2 BP 75 W 18000 -1.8 -1.3 PE 3100 -7.0 -11.4 30C05 -9.8 -10.6 SILWEr L7001 +12.0 ~15.5 p400 -13.3 -13.9 I~KLE 4: Results o~ comParative Example 2 TESr G ~EST H
FIUID~ Weioht Chanqe 3 ~ e Seawater. -83.0 -81.0 Ebntonite/PA~/seawater. -64.0 -60.0 Xanthan gum/6eawatcr. -34.0 -35,0 -- NO 92~07919 2 ~ 9 .~ ~ O a PCT/(JB91/01944 l~BIE 5: ~esults of Examp].e 3 TESr I TEST J
FLUID % Weiqht Chanqe% Wbi~ht Chanqe As Eentonite/PAC/seawater In comparative example 2 + 5% PE 310 -29.0 -ll.0 As Bentonite/PAC/ssawater In comparative example 2 ~ 5% Silwet 720. -2.0 o.o As a~chan g~n/seawa~
In compara~ive example 2 + 2.8% Sil~et 720. -l2.O -6.0 As Xa~than gum/seawater In oomparative example 2 + 2.2% PE 3100. -16.0 -~16.
Claims (19)
1. An additive for a drilling fluid, comprising a composition which is at least dispersible in said drilling fluid at ambient temperatures, and has a solubility in said drilling fluid at drilling temperatures which is lower than the solubility at said ambient temperatures, and said composition, when dispersed in water, has a higher affinity than water for the surface of a rock being drilled.
2. An additive according to claim 1, wherein said composition is substantially insoluble in said drilling fluid at said drilling temperatures.
3. An additive according to claim 2, wherein said composition is soluble in said drilling fluid at ambient temperatures.
4. An additive according to claim 1, 2 or 3 wherein said composition comprises a polymer containing alkylene oxide repeating units.
5. An additive according to claim 4, wherein said polymer has a molecular weight of at least 1000.
6. An additive according to claim 4 or 5 wherein said alkyl oxide includes ethylene oxide.
7. An additive according to claim 4, 5 or 6 wherein said alkyl oxide includes propylene oxide.
8. An additive according to claim 3 or 4, wherein said polymer is selected from at least one of the group consisting of: an ethylene oxide/propylene oxide block copolymer; a polyalkylene oxide-modified polymethyl-siloxane; a polyalkylene oxide modified polyamine, alcohol or glycerine; and polypropylene glycol.
9. An additive according to claim 1, 2, 3 or 4, wherein said polymer contains 5 to 75 wt% ethylene oxide and 25 to 95 wt%
propylene oxide.
propylene oxide.
10. An additive according to claim 1, 2, 3 or 4, wherein said polymer contains 5 to 50 wt% ethylene oxide and 50 to 95 wt%
propylene oxide.
propylene oxide.
11. A drilling fluid comprising a mixture of water and substantially 0.1 to substantially 10 wt% of an additive according to any preceding claim.
12. A drilling fluid according to claim 11, comprising between substantially 0.1% and substantially 5% of said additive
13. A drilling fluid according to claim 11, comprising substantially 1 wt% of said additive.
14. A drilling fluid according to claim 11, 12 or 13, further comprising Bentonite/polyanionic cellulose.
15. A drilling fluid according to claim 11, 12 or 13, further comprising xanthan gum.
16. A drilling fluid according to claim 15, wherein said xanthan gum is saturated with sodium chloride,
17. A drilling fluid according to any of claim 11 to 15, wherein said water is seawater.
18. The use of an additive according to any one of claims 1 to 10 in a drilling fluid.
19. The use in the wellbore drilling of a stratum, of a saturated or unsaturated aqueous solution of a substance which exhibits a critical solution temperature between ambient temperature and the service temperature at the stratum.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9024141.5 | 1990-11-06 | ||
| GB909024141A GB9024141D0 (en) | 1990-11-06 | 1990-11-06 | Additive for a drilling fluid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2095605A1 true CA2095605A1 (en) | 1992-05-07 |
Family
ID=10684967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2095605 Abandoned CA2095605A1 (en) | 1990-11-06 | 1991-11-06 | Additive for a drilling fluid |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0556246A1 (en) |
| AU (1) | AU8859291A (en) |
| CA (1) | CA2095605A1 (en) |
| GB (1) | GB9024141D0 (en) |
| WO (1) | WO1992007919A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6242389B1 (en) | 1997-04-14 | 2001-06-05 | Bp Chemicals Limited | Ethers |
| US7703527B2 (en) * | 2007-11-26 | 2010-04-27 | Schlumberger Technology Corporation | Aqueous two-phase emulsion gel systems for zone isolation |
| US10081751B2 (en) | 2016-04-01 | 2018-09-25 | Saudi Arabian Oil Company | Modification of bentonite properties for drilling fluids |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3018826A (en) * | 1958-06-16 | 1962-01-30 | Union Oil Co | Method for increasing the permeability of subterranean formations |
| US3747681A (en) * | 1972-05-26 | 1973-07-24 | Marathon Oil Co | Hydraulic fracturing process using polyethylene oxide based fracturing fluid |
| US3946811A (en) * | 1974-11-25 | 1976-03-30 | Marathon Oil Company | Polyalkene oxide preslug for protecting displacement fluids from polyvalent ions |
| US4005749A (en) * | 1975-11-11 | 1977-02-01 | Mobil Oil Corporation | Oil recovery by surfactant waterflooding |
| US4646834A (en) * | 1980-09-22 | 1987-03-03 | Dowell Schlumberger Incorporated | Aqueous treatment fluid and method of use |
-
1990
- 1990-11-06 GB GB909024141A patent/GB9024141D0/en active Pending
-
1991
- 1991-11-06 CA CA 2095605 patent/CA2095605A1/en not_active Abandoned
- 1991-11-06 WO PCT/GB1991/001944 patent/WO1992007919A1/en not_active Application Discontinuation
- 1991-11-06 EP EP19910919529 patent/EP0556246A1/en not_active Withdrawn
- 1991-11-06 AU AU88592/91A patent/AU8859291A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| AU8859291A (en) | 1992-05-26 |
| WO1992007919A1 (en) | 1992-05-14 |
| EP0556246A1 (en) | 1993-08-25 |
| GB9024141D0 (en) | 1990-12-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2460954C (en) | Dry mix for water based drilling fluid | |
| Caenn et al. | Drilling fluids: State of the art | |
| EP0973843B1 (en) | Well servicing fluid for trenchless directional drilling | |
| Van Oort et al. | Silicate-based drilling fluids: competent, cost-effective and benign solutions to wellbore stability problems | |
| US6489270B1 (en) | Methods for enhancing wellbore treatment fluids | |
| EP0850287B1 (en) | Glycol based drilling fluid | |
| CA2737445C (en) | Inhibitive water-based drilling fluid system and method for drilling sands and other water-sensitive formations | |
| US4498994A (en) | High temperature stable drilling fluids containing non-aqueous solvents | |
| CA2564566C (en) | Inhibitive water-based drilling fluid system and method for drilling sands and other water-sensitive formations | |
| US4514310A (en) | High temperature stable fluids for wellbore treatment containing non-aqueous solvents | |
| US20070056731A1 (en) | Method for reducing density of a system fluid and for performing drilling operations using a reduced density system fluid comprising aerogel | |
| CA2515058C (en) | Stabilized colloidal and colloidal-like systems | |
| EP0957149A2 (en) | Invert emulsion well drilling and servicing fluids | |
| US7829506B1 (en) | Clay stabilizing aqueous drilling fluids | |
| CA2095605A1 (en) | Additive for a drilling fluid | |
| US4312765A (en) | Viscosifying agent | |
| US20210047558A1 (en) | Defoaming Composition Comprising A Tall-Oil-Derived Surfactant | |
| WO1996024646A1 (en) | Drilling fluid | |
| US11021644B2 (en) | Drilling fluids and methods of making thereof | |
| US20040171497A1 (en) | Stabilized colloidal and colloidal-like systems | |
| US20210131201A1 (en) | Oil swellable material for low temperature lost circulation material application | |
| MXPA04012330A (en) | Lubricants for drilling mud containing silicic acid. | |
| MXPA05002845A (en) | Foamed inhibited polymeric sea water-based system for perforating sea wells. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |