CA1301057C - Tubing collar - Google Patents
Tubing collarInfo
- Publication number
- CA1301057C CA1301057C CA000598568A CA598568A CA1301057C CA 1301057 C CA1301057 C CA 1301057C CA 000598568 A CA000598568 A CA 000598568A CA 598568 A CA598568 A CA 598568A CA 1301057 C CA1301057 C CA 1301057C
- Authority
- CA
- Canada
- Prior art keywords
- collar
- connector
- sleeve
- seal means
- tubing
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
- F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/003—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings with electrically conducting or insulating means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B36/00—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling, insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
Abstract
Abstract A collar for electrically insulating between upper and lower tubing sections (13a,13b) in which load bearing insulating materials (35) in the collar are isolated from fluids both interior and exterior the collar.
Description
~3(~ 7 TUBING COLLAR
Thls lnventlon relates to tublng colla~s and partlcularlly to tublng collars ln tublng strlngs used to transmlt electrlcal current.
U.S. Patent No. 4,716,960 dlscloses a system ut~llzlng a tublng strlng to conduct electrlcal current whlle malntalnlng a cold well head. The well head ls lnsulated from the electrlcally conductlng sectlon of the tublng by an lnsulatlng collar. Whlle the collar dlsclosed ln thls patent has functloned satlsfactorlly under normal, relatlvely low well pressure condltlons, lt has been found that durlng stlmulatlon procedures the hlgh pressures lnvolved may facllltate mlgratlon of llqulds lnto the lnsulatlon materlal area and cause fallures. Further, lf hlgh productlon pressures are malntalned over a long perlod of tlme, the experlence wlth stlmulatlon suggest that fallures mlght occur ln the collar.
It ls an ob~ect of thls lnventlon to provlde an lmproved lnsulatlng collar ln whlch the lnsulatlng materlal between metalllc connectors is protected agalnst contact by flulds ln the well.
Thls ob~ect ls achleved through the lnventlon whlch, ln a broad aspect, resldes ln a tublng collar comprlslng. lnner and outer tubular connectors of electrlcally conductlng materlal concentrlcally arranged wlth one end of the lnner connector posltloned lntermedlate the ends of the outer connector, each of sald connectors provlded wlth threads for connectlng the collar in a tubing, a plurality of circumferentially extendlng shelves carried by the lnner and outer connectors and lnterlocklng wlth 13U~
Thls lnventlon relates to tublng colla~s and partlcularlly to tublng collars ln tublng strlngs used to transmlt electrlcal current.
U.S. Patent No. 4,716,960 dlscloses a system ut~llzlng a tublng strlng to conduct electrlcal current whlle malntalnlng a cold well head. The well head ls lnsulated from the electrlcally conductlng sectlon of the tublng by an lnsulatlng collar. Whlle the collar dlsclosed ln thls patent has functloned satlsfactorlly under normal, relatlvely low well pressure condltlons, lt has been found that durlng stlmulatlon procedures the hlgh pressures lnvolved may facllltate mlgratlon of llqulds lnto the lnsulatlon materlal area and cause fallures. Further, lf hlgh productlon pressures are malntalned over a long perlod of tlme, the experlence wlth stlmulatlon suggest that fallures mlght occur ln the collar.
It ls an ob~ect of thls lnventlon to provlde an lmproved lnsulatlng collar ln whlch the lnsulatlng materlal between metalllc connectors is protected agalnst contact by flulds ln the well.
Thls ob~ect ls achleved through the lnventlon whlch, ln a broad aspect, resldes ln a tublng collar comprlslng. lnner and outer tubular connectors of electrlcally conductlng materlal concentrlcally arranged wlth one end of the lnner connector posltloned lntermedlate the ends of the outer connector, each of sald connectors provlded wlth threads for connectlng the collar in a tubing, a plurality of circumferentially extendlng shelves carried by the lnner and outer connectors and lnterlocklng wlth 13U~
each other, lnsulatlng materlal between the lnner and outer connectors electrlcally lnsulatlng them from each other, a sleeve of substantlally non-conductlng and substantlally non-permeable materlal llnlng a sectlon of the bore through the outer connector and telescoped wlth sald one end of the lnner connector, f lrst seal means seallng between the sleeve and the lnner connector, and second seal means seallng between the sleeve and the outer connector.
Other ob~ects features and advantages of thls lnvention wlll be apparent from the drawlngs, the speclflcatlon and the clalms.
~.
MRY-E12-l~89 13: 46 FROM FOUNT~IN ~JIEW O-~ TO 1613~328440 P. 14 ~ 30 1 Q ~ 7 In the drawing~ where in illustrati~e embodime~t8 of thi~ ~ve~tion are ~hown:
Fig. 1 i~ a s~hema~i~ view, partly ln eleva~ion and pa~ly in section, illu6trating a sys~e~ ln whi&h ~e collar of this invention may be emp~oy~d;
o5 Fig. 2 is an exploded sec~lon~l view of 8 collar const~ucted in accordance wi~h ~his i~ven~io~;
Fi8. 3 i~ a vie~ along the lines 3-3 of Fig. 2 ant;
Fig. 4 i8 a view partly in elevae10n and partly in 10 section of an al~e~n~tive form of thi4 invention.
Re~erring firs~ ~o Fig: I, a petroleum well i8 shown to include a casing 10 in the well bore and secured to a well head indicated generall~ at 1t. A8 i~
conventlonal she casing and wellhead ~re formed of 15 electrically conducting mater1al ~uch ~g steel. At the lower end of the caoing, perforstions 12 admi~ fluid from the fo~m~tion lnto t~e well bore.
A tubing havin~ an upper ~ectio~ 13a and a lower se~tion 13b i~ ~u8pended in the ca~ing and ~onvey~ well 20 fluid ~o t~e surface and out through the pip~ 14 to the g~thering 8y~em of the fi~ld in which Sh~ well i8 lo~a~ed.
The ~ppe~ and lower sec~io~ of the tubin~ are co~e~ted by an i~sulating collar 15 which electrically 2~ i~sulates the ~wo tubln~ ~ection~ from e~ch other whlle M~ l3:4~ FROM FI~UhlT~lN ~JIEI.J O-S TO 1613232~3440 P.01 13V;I~
mechanically connectin~ the ~wo sections. The upp~r and lower tubing sec~ion are form~d of elect~ically conducting materi~l ~uch a~ conv~ntio~al 8teel, Below thQ insulating collar 1S ~h~ tubing 13b is electrically insulated ~om ~he casin~ by a plurality 05 of ing~lating ~pace~s 16 which ar~ ca~ed on the . ext~rior of ~he tubing and sp~ce the tubing from the casing. T~e~e ~pace~8 are of lnsulatin~ mate~ial 8uch as pla8tic and are spaced at interva~ along the ~u~ing ~9 needed, such as on each joinS of tubin~, to elec~rically ~n4ulatR the tu~ing from the casing.
At a sel~cted depth which woult b~ b~low the normal level o solids ~ormation in the tubing an electrical connec~ion i8 made between ~he ca8ing and the tubin~. This electrical con~ec~on might take a~y form, such a~ the 6craScher 17 which i8 of generally conventional form and include~ contacto~8 1B whi~h are desi~ned to cut through any ma~eri~l ~hich m~ b~
pre~nt on the casing an~ thus enga~e the c~ in8 to p~ovide good electrical co~tact ~herew~th. The ~o s~a~he~ and itQ conta~s are of ~lectr~c~lly conduct~ng ma~e~ial and are in electric~l cont~ct wlth : the tubing 13b to electrically connect the tubing 13b w~h the ca~ ing 1 0 .
~t th~ eurace a ~ource of powe~ 22 18 prov$~ed or h~ating the tubing 13b. Thio source of power has M~Y-~-198~ 13:4:~ FROM FOUNT~IIN ~JIEW O-S TD 161323284L10 P.02 ~3 one lead 19 which e~e~ds ~hrough the wall of the cas~ng and i~ connected to ~he tubing 13b i~ any desired ma~ne~. In Fig. 1 this l~ad l~ ~8 shown to connect eo insula~ing collar 15.
T~e othe~ lead 21 from the power source is 05 connect~d to the well head at any conve~ient point.~he sour~:e 22 may ~eceivR power ~rom lines 23 & 24.
While Fig. 1 is speciflcall~ directed ~o paraffin - removal it will be appa~e~t ~ha~ the colla~ of thi~
inven~on may be used in any type o~ installation ~uc~
as providin~ power to a heat~r or motor, o~ mlcrowave or radio wave ~roadçasting facility.
Fi~. 2 illustrate~ one o~m o~ thi~ invention.
Inner connector 25 i~ provided at its upper e~d w~th threads 26 tO ~onnect the collar to a tubing ~tring thereabove. The co~nec~or i~ tubular in fox~ ~d made of ~etal such a8 con~entional ~eel u~lll2ed in tub~ng - collars. On its exterior the connector is provld~d ~ith spaced ~helve~ 27 which preerably i6 a continuou~
~hread for suppor~in~ ehe concentrically a~an8ed outer : 20 connector 29. A~ its lower end the connector i8 p~ovided with ~eal means such as a pair o~ 0~ go 28 and 28a ~o seal with ~leeve 31.
The outer connector 29 ig fo~ed of electric~lly conducting material ~uch as convention~l collar steel . ~
~ `r-~2-1~139 13:4~ FRI~IM FOUNT~IN ~.'IEW O-~ TO 1613232~1440 P~la3 ~30~
a~d the collar will ~uppo~ ~ tu~ing st~in8 ~ecured to thread~ 32 in the lo~er ent of the ou~e~ ~onnector.
To 3u~pe~d ~he outsr connector fro~ the ~nner connector spaced ~helves 33 are provided in the bore of ~he ~ubular ou~er ~onnector and in~erlo~k with shelves 05 27. As ~n the cas~ of shelves 27 th~s~ shelve~ 33 a~eprefe~bly prov~ded by a coneinuou~ thread. The ou~er ~onnector i8 lo~ger than ths inner connec~o~ and th~
lower end of the inner connector is pr~f~rsbly spaced fro~ ~he lower end of ~he outer connOEcto~ ~o~ a purpose o diQcus~ed belo~.
Adj~cen~ the lowex t~read 32 ~eal mean~ i~
provided ln ~he bore of the lower connecto~ by 0-rings 34 and 34a for sealing with sleeve 31 as dlscu~sed below.
lS Insulating mæterial i8 provided between the lnner and outer connector~. Thi~ in~ulating material includes ~aterial 35 be~ween the interlocking shelves. ~ate~al 35 provides for ~lectric~l in~ulation betwe~n the ~onnector~ and mechanical 4trength to support the ~eight b~low th~ collar. This material i~ prefe~bly an Epoxy ~uch as an aramat ic amine .
~ he in~ul~ting mate~ial also ~ncludes the ~leeve 31, prefQrably formed of plastic material. T~e 81eeve 31 brid~es the ~pace between the lower end of the inner ~S connector and the ~eal means 34 and 34a and p~v~n~s . .
M~ 2~ 1 13:5~1 FRO~l FOUNTf:llN ~,IIEW O-S TO 1613232844~1 P.04 1 301 ~5~7 electr~al contact betwee~ sh~ inner and outer connector8 through w~ter e~trained in the flu~d flow~ng through the coll~r. Se~ls 28, 28a, 34 and 34a pre~ent ~ell fluids from r~achin~ in8ulating mat~rial 35 in the area of the i~terloc~in~ s~elve8. A~ ~he bore through the lnner conneetor and ~leeve should be identieal the upper ~nd o the sleeve i8 couD~erbo~ed at 36 to telescope ~ith the inner connec~or and coopQrate wi~h seals ~8 and 28a.
The ~lee~e 31 should be form~d f~om mate~
k~ving good electri~al and permeability proper~ie-~.
~luorocarbons such a~ Teflon ava~lable fr~m E.I.~upont, Newport, ~el. may b~ u~ed~ It i~ preferred ~hat a virgin homopolymer of ~hlo~otrifluoroethylene 8uc~ as KEL-F 8l obtainable rom 3 ~ Compa~y, 3 ~ Center, St.
. 15 Paul, MLnn. bR u~ed.
: The 81eeve 31 and t~e fir8~ and second seal8 not only in~ulate between the two con~ectors, they al80 prevenS fluid8 rom reaching the Epo~y 35 from the interior o~ the collar. The Epoxy i~ pre~erably p~otected rom conta~t ~th well fluids w~ich m~ght ca~8e æho~ting in the collar.
Durln~ ~æ4embly ~leeve 31 i8 pre~ ittet into the ou~er connector un~il it bottoms o~ ~helf 38. The connecto~s are screwed toge~her and held in the de8ired ~elation~h~p by a suitable ~xture. Epo~y i8 i~j ected ~ t~.p~ .ks M~Y-E)2-19~9 1~:50 FR01`1 FOUNTI: IN ~JIEW 0-5 T0 161323~8440 P.05 131~
~hrough por~ 37 until it fill~ the annulus between the t~o ~onnec~ors above seal 28. An ann~l~ 39 ~8 provided ~n the upper end of ~he collar by removing ~he uppermost ring o Epoxy and ~ ~mall ~mount of ~al f~om eaeh ~onnector to provide good ssal 8u~ces. A
05 third seal means, preerably lip type, i~ installed ln annulas 39. Before installin~ the seal the ensire sur~ace def~ni~g the annulu~, ~s w~ll as t~e ~eal are coated with a materi~1 which will p~efer~ntially wet the surface~ ~nd ~eal a4 well as fill ~ny voids in the seal to inhiblt pa888ge of llquid ~u~h ~B w~ter pass th~ ~eal. Pre~e~ably a s~ one base m~te~ial di~cu~sed below is used.
The th~rd seal ~ans p~otec~s the Epo~y from attack by fluld8 in ~he annulu~ of ~ well such as during a ~timulation operation. ~urin~ normal use the well annulu4 will bo ~illed with non-conducting fluid such a~ a ga~ or oil.
Ie i~ preferred ~hat the Epoxy completely fill the ann~lu$ from the sleo~e 31 to the third ~e~l 41.
A ~ing 42 connects the powe~ conduit 19 (~ig. I) ~o the o~ter connecSor 29~ ~h~ rlng 42 i8 providet wlth internal threads 43 fo~ ma~ing up w~th threads 44 on th~ upper end o~ the outer ~onnec~or. A bl~nd bore 45 ig pro~ided in the r~g for connection of the powor co~dui~ by any de~ed connection tec~nique. Horizontal ~lFlY-~-1989 13:51 ~ROI`l FOUNTf~lN ~IEW O-S TO 1613232~440 P.06 ~ 3 0 ~
wrench ~10~8 46 receive tool~ for making up th~ ring on the connector.
Fig, 4 illustrate8 ~ modiied for~ of ehis invention whi¢h p~ovides even gre~te~ prot~ction for the Epo~y insulating m~terial. The collar is OS ~u~stan~ially the 8ame aY the Fi8. 3 form and ehe s~e ~eerence numerals have been used on ~denti~l parts.
The only differenee is in the sddition of an 0-ring and a~ in~ectlon port th~ough which a p~ote~tive material i6 injected.
lo In the Fig. 4 form a port 47 i8 provided in th~
outer con~ector ove~lying the oleeve 31, a four~h ~e~l is provided by 0-ring 48, and a nonsolld ,noncompre~s~ble material 18 provided in ~he spac~
defined by the first. second and fourth oeal mean8 -Prefera~ly this ma~e~ial i8 confined under pressure 80 tha~ ~e æl~eve 31 is ~upported againgt internal p~essure. ThU8 as p~e~Yure inc~eases in the bo~e ~r~ugh the colltr the pressure of this non~olid material increaseY and no sub~tantial diferential i8 created across the sleeve to thus pro~ct the sleev4.
The non~olid mate~ial i8 preferably no only one with good eleceri~al ch~racte~istic~ but one which will preferentially we~ everything lt con~acts a~d prevent ~y water which may pa4s th~ oeals from wetSlng any o~
these ou~faces. P~eferably the ~aterial i8 a o~llcone M~`f. I~ IS~ 5~ FROrl FOUNTRIN ~JIEW O-S TO 16132328440 P.07 ba8e material such a8 Dow Corning 510, vi6~08i~y 500 c~
available from ~ow ~orni~ ~ompany, Midland, Mich.
During assem~ly of ~he Fig. 4 for~ o~ ~he invention the seal 48 is po~itioned a~o~e ~h~ 81~ve 31 prior to insertion of ~he inner connector. Afte~ the 05 Epo~y ~a~ been inj~cted port 37 is clo8ed b~ plu~ 49.
~n 0-rin~ 51 may be u~ed to p~o~ec~ against entry o fluid from the exterior ~f desi~ed. While not 8hown in Fig~ 3 the plug 49 and O-ring 51 ars u8ed wlth the Fig.
Other ob~ects features and advantages of thls lnvention wlll be apparent from the drawlngs, the speclflcatlon and the clalms.
~.
MRY-E12-l~89 13: 46 FROM FOUNT~IN ~JIEW O-~ TO 1613~328440 P. 14 ~ 30 1 Q ~ 7 In the drawing~ where in illustrati~e embodime~t8 of thi~ ~ve~tion are ~hown:
Fig. 1 i~ a s~hema~i~ view, partly ln eleva~ion and pa~ly in section, illu6trating a sys~e~ ln whi&h ~e collar of this invention may be emp~oy~d;
o5 Fig. 2 is an exploded sec~lon~l view of 8 collar const~ucted in accordance wi~h ~his i~ven~io~;
Fi8. 3 i~ a vie~ along the lines 3-3 of Fig. 2 ant;
Fig. 4 i8 a view partly in elevae10n and partly in 10 section of an al~e~n~tive form of thi4 invention.
Re~erring firs~ ~o Fig: I, a petroleum well i8 shown to include a casing 10 in the well bore and secured to a well head indicated generall~ at 1t. A8 i~
conventlonal she casing and wellhead ~re formed of 15 electrically conducting mater1al ~uch ~g steel. At the lower end of the caoing, perforstions 12 admi~ fluid from the fo~m~tion lnto t~e well bore.
A tubing havin~ an upper ~ectio~ 13a and a lower se~tion 13b i~ ~u8pended in the ca~ing and ~onvey~ well 20 fluid ~o t~e surface and out through the pip~ 14 to the g~thering 8y~em of the fi~ld in which Sh~ well i8 lo~a~ed.
The ~ppe~ and lower sec~io~ of the tubin~ are co~e~ted by an i~sulating collar 15 which electrically 2~ i~sulates the ~wo tubln~ ~ection~ from e~ch other whlle M~ l3:4~ FROM FI~UhlT~lN ~JIEI.J O-S TO 1613232~3440 P.01 13V;I~
mechanically connectin~ the ~wo sections. The upp~r and lower tubing sec~ion are form~d of elect~ically conducting materi~l ~uch a~ conv~ntio~al 8teel, Below thQ insulating collar 1S ~h~ tubing 13b is electrically insulated ~om ~he casin~ by a plurality 05 of ing~lating ~pace~s 16 which ar~ ca~ed on the . ext~rior of ~he tubing and sp~ce the tubing from the casing. T~e~e ~pace~8 are of lnsulatin~ mate~ial 8uch as pla8tic and are spaced at interva~ along the ~u~ing ~9 needed, such as on each joinS of tubin~, to elec~rically ~n4ulatR the tu~ing from the casing.
At a sel~cted depth which woult b~ b~low the normal level o solids ~ormation in the tubing an electrical connec~ion i8 made between ~he ca8ing and the tubin~. This electrical con~ec~on might take a~y form, such a~ the 6craScher 17 which i8 of generally conventional form and include~ contacto~8 1B whi~h are desi~ned to cut through any ma~eri~l ~hich m~ b~
pre~nt on the casing an~ thus enga~e the c~ in8 to p~ovide good electrical co~tact ~herew~th. The ~o s~a~he~ and itQ conta~s are of ~lectr~c~lly conduct~ng ma~e~ial and are in electric~l cont~ct wlth : the tubing 13b to electrically connect the tubing 13b w~h the ca~ ing 1 0 .
~t th~ eurace a ~ource of powe~ 22 18 prov$~ed or h~ating the tubing 13b. Thio source of power has M~Y-~-198~ 13:4:~ FROM FOUNT~IIN ~JIEW O-S TD 161323284L10 P.02 ~3 one lead 19 which e~e~ds ~hrough the wall of the cas~ng and i~ connected to ~he tubing 13b i~ any desired ma~ne~. In Fig. 1 this l~ad l~ ~8 shown to connect eo insula~ing collar 15.
T~e othe~ lead 21 from the power source is 05 connect~d to the well head at any conve~ient point.~he sour~:e 22 may ~eceivR power ~rom lines 23 & 24.
While Fig. 1 is speciflcall~ directed ~o paraffin - removal it will be appa~e~t ~ha~ the colla~ of thi~
inven~on may be used in any type o~ installation ~uc~
as providin~ power to a heat~r or motor, o~ mlcrowave or radio wave ~roadçasting facility.
Fi~. 2 illustrate~ one o~m o~ thi~ invention.
Inner connector 25 i~ provided at its upper e~d w~th threads 26 tO ~onnect the collar to a tubing ~tring thereabove. The co~nec~or i~ tubular in fox~ ~d made of ~etal such a8 con~entional ~eel u~lll2ed in tub~ng - collars. On its exterior the connector is provld~d ~ith spaced ~helve~ 27 which preerably i6 a continuou~
~hread for suppor~in~ ehe concentrically a~an8ed outer : 20 connector 29. A~ its lower end the connector i8 p~ovided with ~eal means such as a pair o~ 0~ go 28 and 28a ~o seal with ~leeve 31.
The outer connector 29 ig fo~ed of electric~lly conducting material ~uch as convention~l collar steel . ~
~ `r-~2-1~139 13:4~ FRI~IM FOUNT~IN ~.'IEW O-~ TO 1613232~1440 P~la3 ~30~
a~d the collar will ~uppo~ ~ tu~ing st~in8 ~ecured to thread~ 32 in the lo~er ent of the ou~e~ ~onnector.
To 3u~pe~d ~he outsr connector fro~ the ~nner connector spaced ~helves 33 are provided in the bore of ~he ~ubular ou~er ~onnector and in~erlo~k with shelves 05 27. As ~n the cas~ of shelves 27 th~s~ shelve~ 33 a~eprefe~bly prov~ded by a coneinuou~ thread. The ou~er ~onnector i8 lo~ger than ths inner connec~o~ and th~
lower end of the inner connector is pr~f~rsbly spaced fro~ ~he lower end of ~he outer connOEcto~ ~o~ a purpose o diQcus~ed belo~.
Adj~cen~ the lowex t~read 32 ~eal mean~ i~
provided ln ~he bore of the lower connecto~ by 0-rings 34 and 34a for sealing with sleeve 31 as dlscu~sed below.
lS Insulating mæterial i8 provided between the lnner and outer connector~. Thi~ in~ulating material includes ~aterial 35 be~ween the interlocking shelves. ~ate~al 35 provides for ~lectric~l in~ulation betwe~n the ~onnector~ and mechanical 4trength to support the ~eight b~low th~ collar. This material i~ prefe~bly an Epoxy ~uch as an aramat ic amine .
~ he in~ul~ting mate~ial also ~ncludes the ~leeve 31, prefQrably formed of plastic material. T~e 81eeve 31 brid~es the ~pace between the lower end of the inner ~S connector and the ~eal means 34 and 34a and p~v~n~s . .
M~ 2~ 1 13:5~1 FRO~l FOUNTf:llN ~,IIEW O-S TO 1613232844~1 P.04 1 301 ~5~7 electr~al contact betwee~ sh~ inner and outer connector8 through w~ter e~trained in the flu~d flow~ng through the coll~r. Se~ls 28, 28a, 34 and 34a pre~ent ~ell fluids from r~achin~ in8ulating mat~rial 35 in the area of the i~terloc~in~ s~elve8. A~ ~he bore through the lnner conneetor and ~leeve should be identieal the upper ~nd o the sleeve i8 couD~erbo~ed at 36 to telescope ~ith the inner connec~or and coopQrate wi~h seals ~8 and 28a.
The ~lee~e 31 should be form~d f~om mate~
k~ving good electri~al and permeability proper~ie-~.
~luorocarbons such a~ Teflon ava~lable fr~m E.I.~upont, Newport, ~el. may b~ u~ed~ It i~ preferred ~hat a virgin homopolymer of ~hlo~otrifluoroethylene 8uc~ as KEL-F 8l obtainable rom 3 ~ Compa~y, 3 ~ Center, St.
. 15 Paul, MLnn. bR u~ed.
: The 81eeve 31 and t~e fir8~ and second seal8 not only in~ulate between the two con~ectors, they al80 prevenS fluid8 rom reaching the Epo~y 35 from the interior o~ the collar. The Epoxy i~ pre~erably p~otected rom conta~t ~th well fluids w~ich m~ght ca~8e æho~ting in the collar.
Durln~ ~æ4embly ~leeve 31 i8 pre~ ittet into the ou~er connector un~il it bottoms o~ ~helf 38. The connecto~s are screwed toge~her and held in the de8ired ~elation~h~p by a suitable ~xture. Epo~y i8 i~j ected ~ t~.p~ .ks M~Y-E)2-19~9 1~:50 FR01`1 FOUNTI: IN ~JIEW 0-5 T0 161323~8440 P.05 131~
~hrough por~ 37 until it fill~ the annulus between the t~o ~onnec~ors above seal 28. An ann~l~ 39 ~8 provided ~n the upper end of ~he collar by removing ~he uppermost ring o Epoxy and ~ ~mall ~mount of ~al f~om eaeh ~onnector to provide good ssal 8u~ces. A
05 third seal means, preerably lip type, i~ installed ln annulas 39. Before installin~ the seal the ensire sur~ace def~ni~g the annulu~, ~s w~ll as t~e ~eal are coated with a materi~1 which will p~efer~ntially wet the surface~ ~nd ~eal a4 well as fill ~ny voids in the seal to inhiblt pa888ge of llquid ~u~h ~B w~ter pass th~ ~eal. Pre~e~ably a s~ one base m~te~ial di~cu~sed below is used.
The th~rd seal ~ans p~otec~s the Epo~y from attack by fluld8 in ~he annulu~ of ~ well such as during a ~timulation operation. ~urin~ normal use the well annulu4 will bo ~illed with non-conducting fluid such a~ a ga~ or oil.
Ie i~ preferred ~hat the Epoxy completely fill the ann~lu$ from the sleo~e 31 to the third ~e~l 41.
A ~ing 42 connects the powe~ conduit 19 (~ig. I) ~o the o~ter connecSor 29~ ~h~ rlng 42 i8 providet wlth internal threads 43 fo~ ma~ing up w~th threads 44 on th~ upper end o~ the outer ~onnec~or. A bl~nd bore 45 ig pro~ided in the r~g for connection of the powor co~dui~ by any de~ed connection tec~nique. Horizontal ~lFlY-~-1989 13:51 ~ROI`l FOUNTf~lN ~IEW O-S TO 1613232~440 P.06 ~ 3 0 ~
wrench ~10~8 46 receive tool~ for making up th~ ring on the connector.
Fig, 4 illustrate8 ~ modiied for~ of ehis invention whi¢h p~ovides even gre~te~ prot~ction for the Epo~y insulating m~terial. The collar is OS ~u~stan~ially the 8ame aY the Fi8. 3 form and ehe s~e ~eerence numerals have been used on ~denti~l parts.
The only differenee is in the sddition of an 0-ring and a~ in~ectlon port th~ough which a p~ote~tive material i6 injected.
lo In the Fig. 4 form a port 47 i8 provided in th~
outer con~ector ove~lying the oleeve 31, a four~h ~e~l is provided by 0-ring 48, and a nonsolld ,noncompre~s~ble material 18 provided in ~he spac~
defined by the first. second and fourth oeal mean8 -Prefera~ly this ma~e~ial i8 confined under pressure 80 tha~ ~e æl~eve 31 is ~upported againgt internal p~essure. ThU8 as p~e~Yure inc~eases in the bo~e ~r~ugh the colltr the pressure of this non~olid material increaseY and no sub~tantial diferential i8 created across the sleeve to thus pro~ct the sleev4.
The non~olid mate~ial i8 preferably no only one with good eleceri~al ch~racte~istic~ but one which will preferentially we~ everything lt con~acts a~d prevent ~y water which may pa4s th~ oeals from wetSlng any o~
these ou~faces. P~eferably the ~aterial i8 a o~llcone M~`f. I~ IS~ 5~ FROrl FOUNTRIN ~JIEW O-S TO 16132328440 P.07 ba8e material such a8 Dow Corning 510, vi6~08i~y 500 c~
available from ~ow ~orni~ ~ompany, Midland, Mich.
During assem~ly of ~he Fig. 4 for~ o~ ~he invention the seal 48 is po~itioned a~o~e ~h~ 81~ve 31 prior to insertion of ~he inner connector. Afte~ the 05 Epo~y ~a~ been inj~cted port 37 is clo8ed b~ plu~ 49.
~n 0-rin~ 51 may be u~ed to p~o~ec~ against entry o fluid from the exterior ~f desi~ed. While not 8hown in Fig~ 3 the plug 49 and O-ring 51 ars u8ed wlth the Fig.
3 orm of the lnvention.
After port 37 i8 clo8ed the collar i8 posltioned ~ith it~ longitud~nal axis extending horizontally ~nd port 47 opening upwardly. ~ sultab~e i~ture i8 at~ached to por~ 47 a~d the area deflned by tho first, second, and fourth seal~ evacuated to 8ubstantially a lS complete vacuum. T~e preerred ~ilicone fluid 18 then i~jected under pressu~e a8 ~u~ge~ed by pump P and the re~ervio~ of sili~oRe. ~referably an inJectio~ pr~s8ure of about 1000 pounds is u~ed to in~ure complete f illing o~ the area. The fix~ure is ~emoved and th~ sillcone 20 per~itt~d ~o reach ~mo~p~eric pres~ure. T~en a plug 52 having an 0-ring 4eal 53 undex itB C8p ~ doped wlth plpe dope and m~de up in port 47. During 8~ch ~a~e up - t~e silico~e w111 be txapped and pre48urized to 4uppor~
the sleeve 31 ngain6t in~rnal pressure.
' ~lRY-QI~-19S~ 13:5~ FROM FOUNT~IN ~IEW 0-5 TO `1613232844~3 P.EI~
1 3 0 ~ 7 T~e p~evious des~ription is illustra~ive of embodi~e~ts of the pre8ent in~ention. Ch~nges snd modification8 will bç readily app~re~t t~ those ~killed in the srt and may be made withou~ dep~rting f~om ~he scope of the in~ention which i8 ~efined in the claim~.
After port 37 i8 clo8ed the collar i8 posltioned ~ith it~ longitud~nal axis extending horizontally ~nd port 47 opening upwardly. ~ sultab~e i~ture i8 at~ached to por~ 47 a~d the area deflned by tho first, second, and fourth seal~ evacuated to 8ubstantially a lS complete vacuum. T~e preerred ~ilicone fluid 18 then i~jected under pressu~e a8 ~u~ge~ed by pump P and the re~ervio~ of sili~oRe. ~referably an inJectio~ pr~s8ure of about 1000 pounds is u~ed to in~ure complete f illing o~ the area. The fix~ure is ~emoved and th~ sillcone 20 per~itt~d ~o reach ~mo~p~eric pres~ure. T~en a plug 52 having an 0-ring 4eal 53 undex itB C8p ~ doped wlth plpe dope and m~de up in port 47. During 8~ch ~a~e up - t~e silico~e w111 be txapped and pre48urized to 4uppor~
the sleeve 31 ngain6t in~rnal pressure.
' ~lRY-QI~-19S~ 13:5~ FROM FOUNT~IN ~IEW 0-5 TO `1613232844~3 P.EI~
1 3 0 ~ 7 T~e p~evious des~ription is illustra~ive of embodi~e~ts of the pre8ent in~ention. Ch~nges snd modification8 will bç readily app~re~t t~ those ~killed in the srt and may be made withou~ dep~rting f~om ~he scope of the in~ention which i8 ~efined in the claim~.
Claims (7)
1. A tubing collar comprising:
inner and outer tabular connectors of electrically conducting material concentrically arranged with one end of the inner connector positioned intermediate the ends of the outer connector, each of said connector provided with threads for connecting the collar in a tubing, a plurality of circumferentially extending shelves carried by the inner and outer connectors and interlocking with each other, insulating material between the inner and outer connectors electrically insulating them from each other, a sleeve of substantially non-conducting and substantially non-permeable material lining a section of the bore through she outer connector and telescoped with said one end of the inner connector, first seal means sealing between the sleeve and the inner connector, and second seal means sealing between the sleeve and the outer connector.
inner and outer tabular connectors of electrically conducting material concentrically arranged with one end of the inner connector positioned intermediate the ends of the outer connector, each of said connector provided with threads for connecting the collar in a tubing, a plurality of circumferentially extending shelves carried by the inner and outer connectors and interlocking with each other, insulating material between the inner and outer connectors electrically insulating them from each other, a sleeve of substantially non-conducting and substantially non-permeable material lining a section of the bore through she outer connector and telescoped with said one end of the inner connector, first seal means sealing between the sleeve and the inner connector, and second seal means sealing between the sleeve and the outer connector.
2. The collar of claim 1 wherein third seal means seals between the other end of the inner connector and the outer connector.
3. The collar of claim 2 wherein said insulating material extends from said first to said third seal means.
4. The collar of claim 1 wherein said sleeve is a virgin homopolymer of chlorotrifluoroethylene.
5. The collar of claim 2 wherein a fourth seal means is positioned between the inner and outer connectors and adjacent the telescoped end of said sleeve, said insulating material extends between said third and fourth meal means;
and an insulating material in non-solid non-compressible form is confined between said first, second, and fourth seal means.
and an insulating material in non-solid non-compressible form is confined between said first, second, and fourth seal means.
6. The collar of claim 5 wherein said non-solid non-compressible material is a silicone base fluid.
7. The collar of claim 6 wherein said silicone base fluid is under pressure.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/190,780 US4861074A (en) | 1988-05-06 | 1988-05-06 | Tubing collar |
| US06/190,780 | 1988-05-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1301057C true CA1301057C (en) | 1992-05-19 |
Family
ID=22702744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000598568A Expired - Fee Related CA1301057C (en) | 1988-05-06 | 1989-05-03 | Tubing collar |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4861074A (en) |
| EP (1) | EP0413753B1 (en) |
| JP (1) | JP2650768B2 (en) |
| AU (1) | AU619843B2 (en) |
| CA (1) | CA1301057C (en) |
| NO (1) | NO180127C (en) |
| RU (1) | RU2070679C1 (en) |
| WO (1) | WO1989011056A1 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2151525C (en) | 1995-06-12 | 2002-12-31 | Marvin L. Holbert | Subsurface signal transmitting apparatus |
| US7252160B2 (en) * | 1995-06-12 | 2007-08-07 | Weatherford/Lamb, Inc. | Electromagnetic gap sub assembly |
| US6179523B1 (en) | 1995-12-29 | 2001-01-30 | Shell Oil Company | Method for pipeline installation |
| US6142707A (en) * | 1996-03-26 | 2000-11-07 | Shell Oil Company | Direct electric pipeline heating |
| US6315497B1 (en) | 1995-12-29 | 2001-11-13 | Shell Oil Company | Joint for applying current across a pipe-in-pipe system |
| US6171025B1 (en) | 1995-12-29 | 2001-01-09 | Shell Oil Company | Method for pipeline leak detection |
| US6264401B1 (en) | 1995-12-29 | 2001-07-24 | Shell Oil Company | Method for enhancing the flow of heavy crudes through subsea pipelines |
| GB9909621D0 (en) * | 1999-04-27 | 1999-06-23 | Well Intelligence Technologies | Telemetry system |
| GB0116120D0 (en) * | 2001-06-30 | 2001-08-22 | Maxwell Downhole Technology Lt | Insulating device and assembly |
| US6814146B2 (en) * | 2001-07-20 | 2004-11-09 | Shell Oil Company | Annulus for electrically heated pipe-in-pipe subsea pipeline |
| US6714018B2 (en) | 2001-07-20 | 2004-03-30 | Shell Oil Company | Method of commissioning and operating an electrically heated pipe-in-pipe subsea pipeline |
| US6739803B2 (en) | 2001-07-20 | 2004-05-25 | Shell Oil Company | Method of installation of electrically heated pipe-in-pipe subsea pipeline |
| US6686745B2 (en) | 2001-07-20 | 2004-02-03 | Shell Oil Company | Apparatus and method for electrical testing of electrically heated pipe-in-pipe pipeline |
| US6688900B2 (en) | 2002-06-25 | 2004-02-10 | Shell Oil Company | Insulating joint for electrically heated pipeline |
| US6937030B2 (en) * | 2002-11-08 | 2005-08-30 | Shell Oil Company | Testing electrical integrity of electrically heated subsea pipelines |
| US7032930B2 (en) * | 2003-02-28 | 2006-04-25 | Ryan Energy Technologies | Electrical isolation connector subassembly for use in directional drilling |
| CA2509819C (en) * | 2004-06-14 | 2009-08-11 | Weatherford/Lamb, Inc. | Methods and apparatus for reducing electromagnetic signal noise |
| BR122019021785B1 (en) | 2010-05-17 | 2020-12-01 | Parker Hannifin Gmbh | dielectric fitting set |
| US9915387B2 (en) * | 2012-11-12 | 2018-03-13 | Multi-Shot Llc | System and method for manufacturing electrically isolated connection for electromagnetic gap sub assembly |
| CA3048249C (en) * | 2016-12-23 | 2021-07-06 | Evolution Engineering Inc. | Sealed gap sub |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1231202A (en) * | 1914-09-09 | 1917-06-26 | Frank D Saylor | Insulating-joint. |
| US3944262A (en) * | 1974-09-12 | 1976-03-16 | Continental Industries, Inc. | Insulated meter riser |
| US4011652A (en) * | 1976-04-29 | 1977-03-15 | Psi Products, Inc. | Method for making a pipe coupling |
| US4496174A (en) * | 1981-01-30 | 1985-01-29 | Tele-Drill, Inc. | Insulated drill collar gap sub assembly for a toroidal coupled telemetry system |
-
1988
- 1988-05-06 US US07/190,780 patent/US4861074A/en not_active Expired - Fee Related
-
1989
- 1989-05-02 WO PCT/US1989/001863 patent/WO1989011056A1/en active IP Right Grant
- 1989-05-02 AU AU35752/89A patent/AU619843B2/en not_active Ceased
- 1989-05-02 RU SU894831518A patent/RU2070679C1/en active
- 1989-05-02 JP JP1505950A patent/JP2650768B2/en not_active Expired - Lifetime
- 1989-05-02 EP EP89906003A patent/EP0413753B1/en not_active Expired - Lifetime
- 1989-05-03 CA CA000598568A patent/CA1301057C/en not_active Expired - Fee Related
-
1990
- 1990-11-05 NO NO904797A patent/NO180127C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| US4861074A (en) | 1989-08-29 |
| RU2070679C1 (en) | 1996-12-20 |
| NO904797D0 (en) | 1990-11-05 |
| AU3575289A (en) | 1989-11-29 |
| JP2650768B2 (en) | 1997-09-03 |
| EP0413753B1 (en) | 1992-09-09 |
| EP0413753A4 (en) | 1991-07-24 |
| EP0413753A1 (en) | 1991-02-27 |
| AU619843B2 (en) | 1992-02-06 |
| WO1989011056A1 (en) | 1989-11-16 |
| NO904797L (en) | 1990-11-05 |
| NO180127B (en) | 1996-11-11 |
| NO180127C (en) | 1997-02-19 |
| JPH03505479A (en) | 1991-11-28 |
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| Date | Code | Title | Description |
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| MKLA | Lapsed |