US2436196A - Chemical removal of an acid-soluble metal part in a deep well - Google Patents
Chemical removal of an acid-soluble metal part in a deep well Download PDFInfo
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- US2436196A US2436196A US609252A US60925245A US2436196A US 2436196 A US2436196 A US 2436196A US 609252 A US609252 A US 609252A US 60925245 A US60925245 A US 60925245A US 2436196 A US2436196 A US 2436196A
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- acid
- well
- metal part
- aluminum
- deep well
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- 229910052751 metal Inorganic materials 0.000 title description 13
- 239000002184 metal Substances 0.000 title description 13
- 239000000126 substance Substances 0.000 title description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 24
- 239000002253 acid Substances 0.000 description 20
- 239000000243 solution Substances 0.000 description 19
- 229910000838 Al alloy Inorganic materials 0.000 description 12
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 8
- DHMQDGOQFOQNFH-UHFFFAOYSA-N Glycine Chemical compound NCC(O)=O DHMQDGOQFOQNFH-UHFFFAOYSA-N 0.000 description 6
- 150000007933 aliphatic carboxylic acids Chemical class 0.000 description 6
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000002904 solvent Substances 0.000 description 5
- 239000003112 inhibitor Substances 0.000 description 4
- 239000004310 lactic acid Substances 0.000 description 4
- 235000014655 lactic acid Nutrition 0.000 description 4
- 235000006408 oxalic acid Nutrition 0.000 description 4
- 239000004471 Glycine Substances 0.000 description 3
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 235000002906 tartaric acid Nutrition 0.000 description 3
- 239000011975 tartaric acid Substances 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 1
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 1
- 206010010071 Coma Diseases 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- PVNIIMVLHYAWGP-UHFFFAOYSA-N Niacin Chemical compound OC(=O)C1=CC=CN=C1 PVNIIMVLHYAWGP-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229940000489 arsenate Drugs 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- AQLMHYSWFMLWBS-UHFFFAOYSA-N arsenite(1-) Chemical compound O[As](O)[O-] AQLMHYSWFMLWBS-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- VYMDGNCVAMGZFE-UHFFFAOYSA-N phenylbutazonum Chemical compound O=C1C(CCCC)C(=O)N(C=2C=CC=CC=2)N1C1=CC=CC=C1 VYMDGNCVAMGZFE-UHFFFAOYSA-N 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/02—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground by explosives or by thermal or chemical means
-
- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/528—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning inorganic depositions, e.g. sulfates or carbonates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/933—Acidizing or formation destroying
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/94—Freeing stuck object from wellbore
Definitions
- v(01. 25a-855)' f "he invention relates to, thechemical removal or ali acid-solublemetal Vpartj in a deep well. Itv more particularly ⁇ ":liiiceiils ⁇ anirnproved method of completing wells traversing ia* plurality ofv strata, in which a chemically?sll'lblcasingsec- ⁇ tion located opposite aselectedfstratumis res' moved by chemical action topermit iluidilow be-Y tween tile ⁇ well coreano the stratum. y
- packer is provided with a central passage for admitting the outer tube Bextending from the top come apparent as the description of tlieinvertiii proceeds.
- dissolution of c parts or eouipment made or alumiiium'pr aluminum alloy m the well is achieved by subjecting the metal part to the corrodingactionvof @hydrochloric acid solution to which has been added au aliphatic carboxylic acidfsufcl'l ⁇ ⁇ as acetic;airline ⁇ acetic (glycine), citric, gluclmic;lactic,V ol'ialic, and tartaric.:
- To prevent or reduce attack by the acid solution on adjacent jferrous metal iparts, ,when such are present, in inhibitor ⁇ of such action may-be 'in-r eluded in theecldselutlcn;
- yAn inner tube 9 is Strungthroughthe outer'tube and extends from the top ofthe wellto near the bottom of the soluble section.
- the chemical solvent cfr-,hydrochloric acid to which V'aliphatic carboxylic acid miiiay'a be introduced throughtube 9 so as to fill the space I0 in the cased portion of the well thef bridgeV 6 and the bottom ofthe tube
- the chemical solvent becomes spent by dissolvingthegmetal of the soluble secl ⁇ fresh solvent may be introduced, if necessary,:thereby displacing the spent solution from the Vwelltlfirough-tube -8.
- taining an aluminum alloy (alll-SglliblVseo concentrations of HC1 may be used,l suohas l5 to :35 per cent, concentrationbetween about 20 and 'pe'r centibeingpeferrd 3
- a suitable amount of one of the aforementioned aliphatic carboxylic acids to use in the hydrochloric acid solution to increase its rate of attack on the acid-soluble section is between aboutV 0.1 and 3 per cent of the weight of the acid solution, between 0.5 and 1.0 being generally preferred.
- any of the well known corrosion inhibitors may be used, such as a soluble-arsenic,
- aluminum used herein and the appended claims is used to mean all grades of aluminumvmetal,4 and the term aluminum alloy means alloys ,of aluminum containing at leastv about per cent of aluminum.
- the method of removing from a well a. metal part formed of aluminum and its alloys which comprises subjecting the part to the dissolving action of an aqueous solution containing from about 15 to 35 per cent of HC1, about 0.25 to 3 per cent of an aliphatic carboxylic acid selected from the group consisting of lactic acid, oxalic acid and tartaric acid, an an inhibitor of the action of the hydrochloric acid on ferrous metal.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
Description
Feb 17, 1948. P. H. CARDWELL x-:T AL 2436,196
CHEMICAL REMOVAL OF AN ACID-SOLUBLE METAL PART IN A DEEP WELL Filed Aug. 6, 1945 INVENTORS /OOU//f C0ra/We// By Lou/'s H E//ers ATTORNEKS Patented Feb. 17, 1948 UNlTl-io Isfr-A1' c 2,436,196 CHEMICAL aEMovALoF AN Aem-someta METAL PART IN A DEEP WELL raulfn. cuua'weu `una Louis H." liners,- rules,
Okla., assignors pany, Midland, Mich.
Ware,
toThe Dow ,Chemical Coma corporation of Dela- L mucatii". August 6 1945QSerial Netstazsfl 4 claims. v(01. 25a-855)' f "he invention relates to, thechemical removal or ali acid-solublemetal Vpartj in a deep well. Itv more particularly `":liiiceiils `anirnproved method of completing wells traversing ia* plurality ofv strata, in which a chemically?sll'lblcasingsec-` tion located opposite aselectedfstratumis res' moved by chemical action topermit iluidilow be-Y tween tile` well coreano the stratum. y
ln the usual yWeil completinin which a chem; ioally soluble section is included in Vthe casing` :stringl opposite a productive sone, the soluble seo'- tion is made ofaluminuin or anaiuxninum alloy, and its removal is effected by prolonged treatment with a quantity-of hydrochloric acid." i
A disadvantaged this-metrica which limits its usefulness 'murat-the action'ci the' acid 1s quite slew, so thatau ,inordinate amount of ,tlmeis ,onsuiiied in the operation aiidcom'plete removal is somewhat uncertain. 5" "I, i Y i particular objectY of theinv'eiiti'onis to proc' vide an improved method of, and composition for, chemically dissolviugrenleluminumlor aluminum alloy part, suchas a Acasing section, in the bore of a Well whereby cdmpleterapid removal is achieved. Other objects and advantages 'will betion 3. variouslaluminum-base alloys are suitable for' thepurposeas, ,for example,j`one containing about .1 percent .ofosilicomabout 1 percent of magnesium, and about 0.3 per cent oil chromium,
., the balance being valulninm'rfl; If desired, unalloyed aluminuminay 'be used The aluminum or los aluminum alloy section isfplaced in the casing string so that thesectionis opposite a productive zone. 4, the annular spaoebetween the casing stringand the well hole beinglled with cement 5... Such Well construction isy conventional and forms nopart'bf'theinvention. A Y
4in preparing the ell for treatment sro as to. remove thefsolublefsection 3 according 4to the in-A vention, the portion of the Wellbelow the productive zone '4 isbridged as with a `filler 6, and a packer 1 is Set in, the casing at the top of the zone therebyV to isolate "for treatment the portion of the `Well containing `the soluble section. The
packer is provided with a central passage for admitting the outer tube Bextending from the top come apparent as the description of tlieinvertiii proceeds. A 4
According tothe invention` dissolution of c parts or eouipment made or alumiiium'pr aluminum alloy m the well is achieved by subjecting the metal part to the corrodingactionvof @hydrochloric acid solution to which has been added au aliphatic carboxylic acidfsufcl'l` `as acetic;airline` acetic (glycine), citric, gluclmic;lactic,V ol'ialic, and tartaric.: To prevent or reduce attack by the acid solution on adjacent jferrous metal iparts, ,when such are present, in inhibitor` of such action may-be 'in-r eluded in theecldselutlcn;
" between thetop of The invention`may morereadily understood fromthe following` detailed description and 'accompanying 1dravtfin'gfoi a Amildev '0f all'yig Out the invention, such mode illustrating butone of various ways inwhich the principleof the inten#- tion may be used-J" the'saiddrawing the .single ligure illustrates schematijoallyinvertical section an oil well'in whichjan acid-'soluble seotionio- Vcated in the casingstring opposite `a product iye zoneis being removed chemically; 4
@Sterling more partielilerlr tohferewie, the well bore I is provided witha. Acasing stringV 2l con-j `tion 3 of the casing,
ofthe Well to just belowthe packer. yAn inner tube 9 is Strungthroughthe outer'tube and extends from the top ofthe wellto near the bottom of the soluble section. A
After arranging the apparatus as described, the chemical solvent. cfr-,hydrochloric acid to which V'aliphatic carboxylic acid miiiay'a be introduced throughtube 9 so as to fill the space I0 in the cased portion of the well thef bridgeV 6 and the bottom ofthe tube As the chemical solvent becomes spent by dissolvingthegmetal of the soluble secl`fresh solvent may be introduced, if necessary,:thereby displacing the spent solution from the Vwelltlfirough-tube -8. Itis preferableto continuously circulate thechernical solvent into the space vIll through tube 9jwhi1e the spenti or partilly spent solventfsolution is displaced through jtubey 8; The amount of solvent ito employ depends upon the concentrationof HC1 therein and the weight of the aluminumV section to be removed, and `nia'y be computed on the basis of the known stoichiometrical relationship between lHC1 and aluminum tol form aluminum chloride '(AlCle). For example, v approximately 1.7 gallons of 25 percent hydrochloric acid solution is re- K quired per pound of aluminuln'section. Various taining an aluminum alloy (alll-SglliblVseo concentrations of HC1 may be used,l suohas l5 to :35 per cent, concentrationbetween about 20 and 'pe'r centibeingpeferrd 3 A suitable amount of one of the aforementioned aliphatic carboxylic acids to use in the hydrochloric acid solution to increase its rate of attack on the acid-soluble section is between aboutV 0.1 and 3 per cent of the weight of the acid solution, between 0.5 and 1.0 being generally preferred.
In order to reduce or preventattack by the acid on the ferrous metal parts of the well which may be exposed to the` acidsolution..particularlythc. steel casing adjacent-tto the acid-solublegpart to be removed, any of the well known corrosion inhibitors may be used, such as a soluble-arsenic,
compound, e. g., the arsenate or arsenite of sodium, organic sulfur compounds, such. as. the-.increr captans, organic nitrogen bases, etc., in itheus'uall I small quantities such as 0.4 to. 1.0 per centof the weight of the acid solution. y
As the aluminum section of the of heat oi neutralization and hydrogen is evolved which is allowed to escape throughv pipe 185 Thecasing dissolves, u the solution becomes heated due to the liberation 4 TABLE II Reaction rate of hydrochloric acid solutions on aluminum alloy accelerated by oalic acid Temperature F.) of Reacting Materials After- Composition of Acid Solution Min. Min. Min. Min. Mn.
HC1a1`one. se v5108" 162 .220 22o 20%+0.5% Oxalic.. 86 110 220 220 216 20 44.0% oxalic.- 86 116 220 220 218 HC1 alone se 159 22s 221 221 25%+0.5% 0Xalic 86 166 224 228 226 25%=l=1.0%0xa1c 86 202 226 226 226 .The data inthe; tables show that by adding 'fan'r aliphatic-carboxylic acid in relatively small generation of heat is an advantage asiit. speeds.
subjected to thedissolving action of hydrochloric;
acid solution to which various aluminum corrosion accelerators` were added; In conducting these tests 300cc., lots of acidi were placed in a calorimetertogether withv a piece of' an aluminum alloy containing'0.2per Vcent Copper, v1'-'1.ier cent magnesium, 0.4 per cent silicon, 0279er cent chromium, the. balance being aluminum,y andthe rate of dissolvingfofl the aluminum alloy deter'- mined by observing from time to. time the temperature attained bythe reacting` materials. In; these tests the higher thetemperature attainedV by the materials ina given time thefaster the dissolving of the aluminum alloy occurred.
Tables I and II present data so'fobtaine'd.l
o TABLE'I" Rate of reaction of 15% hydrochloric. acid solution on aluminum alloy accelerated by aliphatic carboxylic acid Temperature .(F.) oiReacting Concentration and Kind oi Materials After* Aluminum Corrosion Accelerator Q 1.5 45. 60
Min M111 Min. Min. Min.
None .(Blank) 86, 106y 121` 135 149 1.0% Acet'ic Ac 86 114 138 166 205 1.9% Citrlc Acid 86 105 132 160 185 1.0%G1uc'nicAcid '86 109 122 142 i 173 0.525% Glycine 86. 109. 142 n 173 211 1.0% Glycine. 86 108' l127 150 173 0.25% Lactic Acid 86- 118 138 179 212 0.5% L'actic Acid 86 117 152 210 214 1.0% I actie Acid s6 117 151 212 214 3.0% lactic Acid 86 108 122 '134 v 148 0.25% O xa'flicAoid 86 118 152 207 214 0.5% Oxalic Acid. 86 117 155 213 214 1.0% 'oxanc Acids6 119 152 214 214 r3,0%Oxa1ic Acid 86 112` 136 175 212 0.10% Tartaljic Ac `86 11'1 140 171 21'2 0.15% Tartari'c Acid 86 f 110 -147 1 189 214 y0.25% Tartaric Acid. 86 132 200 214 Y 213 0.5% Tartaric Acid.; 86- 125 158v '214 214 j1 0'72, TartarlcvA'cid.. :86 T124 i 4156V 210 v v214 3.0% Tartarric Acid.- f 86 128 162 185 amount'. to .hydrochloric acid solution its rate of attack on aluminum alloy is increased. This is evident fromthe fact that the temperature of V'the reacting materials attains a higher value in less time when an aliphatic carboxylic acid is present in the acid solution.
' As aiurther example of the increased speed of,` action obtainable with our acid solution com,-
Parative tests were made inwhich a given weight oi?4 the acid solution was allowed toexpend itselfin dissolving aluminum alloy tubing.. the alloy.- having the composition last mentioned.. these; tests, it was found Athat whereas commercial hyz drochloric acid alone containing 25-per cent by' weight of HC1.. expended itself `i n,abou t 30 minutes, the additionY of from 0-.5 per. centxto 1- per cent of oxalic acid to the same,hydrocliloricv acidAv solution increasedits rate. of actionl so that-onlyl about-20 minutes were required for. its expendif ture under comparable conditions. Similar tests.- madewith'20 p er cent hydrochloric acid-solution gavea spending timev of 45. minutes when used.
aloneincomparison with a spending time of about125 to v'30 minutes when thevfsame concen-l tration of acid solution containing from 0.5 vto lper cent of oxalic. acid, respectively, was used similarly. y Y
Theterm aluminum used herein and the appended claims is used to mean all grades of aluminumvmetal,4 and the term aluminum alloy means alloys ,of aluminum containing at leastv about per cent of aluminum.
We claim:
1. The lmethod of removingV from a Wella metal part formed of aluminum. and its alloys which comprises subjecting the part tothe dissolving action of an aqueous solution. containing from about 20. to 30 per cent of hydrochloric acid and 0.25. t03 percent of oxalic acid and an inhibitor of the action ofthe hydrochloric acid on ferrous xAneta'l;` I
2. The method of removing irom a well a metal part formed of aluminum and its. alloys Whichcomprises subjecting theQpart. tothe dissolving action of an aqueoussolution containing from about 20`to 30 percentof. hydrochloric acid and"- 0.25 to 3 per cent of' lactic acid and an inhibitor.4
of the action of the hydrochloric acid, on ferrous metal. Y
3. The method of removing'jfrom a well a metal -part formed of aluminumfand its alloys which of the action of the hydrochloric acid on ferrous..
metal. l
4. The method of removing from a well a. metal part formed of aluminum and its alloys which comprises subjecting the part to the dissolving action of an aqueous solution containing from about 15 to 35 per cent of HC1, about 0.25 to 3 per cent of an aliphatic carboxylic acid selected from the group consisting of lactic acid, oxalic acid and tartaric acid, an an inhibitor of the action of the hydrochloric acid on ferrous metal.
PAUL H. CARDWELL. LOUIS H. EILERS.
REFERENCES CITED The following references are of record in the 111e of this patent:
Number UNITED STATES PATENTS Name Date Chamberlain I Dec. 17, 1935 Morgan Aug. 23, 1938 Bresler Dec. 13, 1938. Stoesser Oct. 3, 1939 Fry Oct.l 15, 1940 Chamberlain II Feb. 25, 1941 Zacher Mar. 11, 1941 Hall et al Aug. 19, 1941 Salnikov Nov. 4, 1941 Frye et al. Feb. 29, 1944
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US609252A US2436196A (en) | 1945-08-06 | 1945-08-06 | Chemical removal of an acid-soluble metal part in a deep well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US609252A US2436196A (en) | 1945-08-06 | 1945-08-06 | Chemical removal of an acid-soluble metal part in a deep well |
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| Publication Number | Publication Date |
|---|---|
| US2436196A true US2436196A (en) | 1948-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US609252A Expired - Lifetime US2436196A (en) | 1945-08-06 | 1945-08-06 | Chemical removal of an acid-soluble metal part in a deep well |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2024718A (en) * | 1934-03-14 | 1935-12-17 | Dow Chemical Co | Treatment of wells |
| US2128160A (en) * | 1937-08-23 | 1938-08-23 | Morgan Leo Clark | Well treating fluid |
| US2140183A (en) * | 1936-07-03 | 1938-12-13 | Shell Dev | Method of treating wells |
| US2175095A (en) * | 1937-07-06 | 1939-10-03 | Dow Chemical Co | Treatment of wells |
| US2217676A (en) * | 1937-05-27 | 1940-10-15 | Dow Chemical Co | Treatment of wells |
| US2232938A (en) * | 1939-02-01 | 1941-02-25 | Dow Chemical Co | Treatment of wells |
| US2234790A (en) * | 1939-02-13 | 1941-03-11 | Tidewater Associated Oil Compa | Mud wall disintegrator |
| US2252973A (en) * | 1939-03-10 | 1941-08-19 | Security Engineering Co Inc | Method for testing and producing the fluids of the earth formations encountered in wells |
| US2261292A (en) * | 1939-07-25 | 1941-11-04 | Standard Oil Dev Co | Method for completing oil wells |
| US2342656A (en) * | 1941-10-01 | 1944-02-29 | Richfield Oil Corp | Well treating fluid |
-
1945
- 1945-08-06 US US609252A patent/US2436196A/en not_active Expired - Lifetime
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2024718A (en) * | 1934-03-14 | 1935-12-17 | Dow Chemical Co | Treatment of wells |
| US2140183A (en) * | 1936-07-03 | 1938-12-13 | Shell Dev | Method of treating wells |
| US2217676A (en) * | 1937-05-27 | 1940-10-15 | Dow Chemical Co | Treatment of wells |
| US2175095A (en) * | 1937-07-06 | 1939-10-03 | Dow Chemical Co | Treatment of wells |
| US2128160A (en) * | 1937-08-23 | 1938-08-23 | Morgan Leo Clark | Well treating fluid |
| US2232938A (en) * | 1939-02-01 | 1941-02-25 | Dow Chemical Co | Treatment of wells |
| US2234790A (en) * | 1939-02-13 | 1941-03-11 | Tidewater Associated Oil Compa | Mud wall disintegrator |
| US2252973A (en) * | 1939-03-10 | 1941-08-19 | Security Engineering Co Inc | Method for testing and producing the fluids of the earth formations encountered in wells |
| US2261292A (en) * | 1939-07-25 | 1941-11-04 | Standard Oil Dev Co | Method for completing oil wells |
| US2342656A (en) * | 1941-10-01 | 1944-02-29 | Richfield Oil Corp | Well treating fluid |
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