CN103835677A - Two-stage sealing bumping-pressure salvageable well completion device for horizontal well - Google Patents
Two-stage sealing bumping-pressure salvageable well completion device for horizontal well Download PDFInfo
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- CN103835677A CN103835677A CN201410106318.8A CN201410106318A CN103835677A CN 103835677 A CN103835677 A CN 103835677A CN 201410106318 A CN201410106318 A CN 201410106318A CN 103835677 A CN103835677 A CN 103835677A
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Abstract
The invention provides a two-stage sealing bumping-pressure salvageable well completion device for a horizontal well. The device comprises a drilling-free plug device, a bumping-pressure rubber plug and a salvaging device. The drilling-free plug device comprises a cementing switch and a packer. The upper end of the cementing switch is connected with a sleeve. The lower end of the cementing switch is connected with the upper end of the packer. The lower end of the packer is connected with a sieve tube. The cementing switch is a check valve type cementing switch. A check valve base is arranged at the bottom end of the check valve type cementing switch. The check valve base comprises a check valve and a blind plug. The two-stage sealing bumping-pressure salvageable well completion device is compact in structure, high in pressure bearing capacity, capable of ensuring the balance between the pressure of liquid inside a well completion pipe string and the pressure of liquid outside the well completion pipe string, convenient to operate on site and safe in construction.
Description
Technical field
The present invention relates to petroleum oil well completion cementing tool, be specifically related to a kind of horizontal well two-stage sealing bruising salvagable completion system.
Background technology
Along with deepening continuously of oil field development, the measure of enhancing efficiency by relying on tapping internal latent power is also in further raising.In order to develop oil sheet, the special wells such as horizontal well, high angle hole are more and more, and the completion of variety of way is also arisen at the historic moment.In horizontal well completion technology, in order to make oil reservoir there is larger bare area, avoid the infringement of cement paste to oil reservoir at present, effectively protect oil-gas Layer, adopt accurate sand screen completion mode more.This completion mode needs to adopt screen casing crest water flooding mud fraclional well cementing technique in drilling process.Stage cementing device is the main accessory of lower sand control screen, is added in the upper end of sand control screen, enters well with tubing string, Main Function is to cut off sand control screen internal and external channel, stops cement paste to enter in sand control pipe and outside tubing string when well cementation, and guarantee pipe is outer is not lived admittedly, cement-free in pipe, keeps unimpeded.The weak point of stage cementing device is after well cementation, descend to bore the annex of stage cementing device (plug, sliding sleeve and blind plate) is bored and removed one by one, to get through road in tubing string.Bore in plug process in completion, owing to being subject to the impact of drilling well well depth track and Action of Gravity Field, produce and creep into skew, cause the inhomogeneous local crescent wearing and tearing of sleeve pipe, reduced the yield strength of sleeve pipe and produced the free segment button phenomenon that gets loose; Meanwhile, the impact of the complicated harsh industrial and mineral such as be subject in process of production later stage steam injection, shake out, produces moulding deformation and fracture and causes casing failure; In addition, because annexes such as boring plug, sizing collar is positioned at down-hole string high deviation angle degree position, while implementing to bore plug, have in pipe that annex cleaning is clean, cement sheath is threaded off, destroyed to wear sleeve or free segment and later stage drifting is not freely hampered problems such as card.Therefore, boring in mill process, not only easily damage sleeve pipe, affected cementing quality, and operation length consuming time, well construction period extended.
Fill in for fear of boring the series of problems bringing, someone has developed and has exempted to bore stage cementing device, common are two kinds.The first is from drift diameter drilling-free plug stage cementing device,, after cementing finishes, makes the internal construction self falling of stage cementing device by building the pressure, and comes downwards to shaft bottom by gravity, thereby reaches the object of exempting to bore plug.But, very tight to hole deviation requirement from drift diameter drilling-free plug stage cementing device, exceed in the well of 20 degree in hole deviation, the internal construction of stage cementing device is just difficult to come off, and is difficult to come downwards to shaft bottom; In horizontal well, more cannot realize self falling.The second is with drilling tool, inner sleeve to be pulled out, and patent 201110127641.X discloses a kind of top cementing of horizontal well sieve tube and exempted to bore instrument and the method for filling in.But this salvaging type is exempted from boring device and aspect function, performance and technique globality, is had the following aspects deficiency:
(1) bottom of cementing construction of switch easily forms local depression district at low pressure and easy leaking lost territory floor, causes the grey passage of note to open before bore hole envelope is setting, causes cement to scurry into inner tube and causes bottom to stay plug, increases operating cost, has a strong impact on oil well production;
(2) twin-stage bore hole sealed packer adopts same valve system to control, and two bore hole sealing cylinder bases envelopes adopt series systems to be connected.This structure is poor in the compliance that is lowered to the complex situations such as damaged in process for irregular and hole enlargement well, unconsolidated formation and packing element, due to a packing element cannot setting meeting causes another one packing element cannot be setting, thereby cause the failure of well cementation;
(3) control valve of open hole packer system adopts inside and outside differential pressure control mode, that is: when pit shaft and annular pressure is poor while reaching certain value, packer set.But being lowered in process of tubing string, pressure is often unstable; In this case, inside and outside differential pressure control mode easily causes packer mistake setting, cannot observe, thereby cause continuing snubbing and cause the breakage of packer and this mistake is setting at well head;
(4) open hole packer lacks the protection of shoulder protrusion-dispelling, poor to the compliance of hole enlargement well when setting, and explosion breakage easily occurs; Be subject to the impact of the factor such as well head pressure and head of liquid variation, in circulation, setting and when well cementation,, overall tubing string, all the time in axial wriggling state, also easily causes packing element and stratum wear and tear and cause breakage simultaneously;
(5) one of open hole packer is movable head, and this is because movable head must move axially along with the bulging of packing element when setting; This structure has met the setting requirement of packing element, but is lowered in process at tubing string, if there is sand setting, caving in etc. makes tubing string be obstructed pressing down in process, can cause movable head on move, thereby cause packing element radial dilatation and wearing and tearing;
(6) close plug and blind plugging is salvaged at twice, increased a tubing string and removed, affected work limitation;
(7) close plug in the time of tamponade, be difficult to thoroughly strike off cement on casing wall residual, thus the head that does fishing that causes closing plug top because ash plug deposition is salvaged difficulty and even cannot be salvaged, thereby needing to bore remove operation, cause construction complicated, affect work limitation.
Summary of the invention
For overcoming many defects of prior art, the invention provides a kind of horizontal well two-stage sealing bruising salvagable completion system.That described horizontal well two-stage sealing bruising salvagable completion system has is simple in structure, dependable performance, operation convenience, short construction period, well cementation are complete without boring mill, the directly lower advantage of salvaging of boring, is mainly used in the fields such as horizontal well, extended reach well, directional well completion and well cementation.
Technical scheme of the present invention:
Horizontal well two-stage sealing bruising salvagable completion system, comprises and exempts to bore plug device, bruising plug and fishing device, described in exempt to bore plug device and comprise cementing switch and packer; The upper end of described cementing switch is connected with sleeve pipe, and the lower end of described cementing switch is connected with the upper end of packer, and the lower end of described packer is connected with screen casing; Described cementing switch is check-valve type cementing switch or blind plugging formula cementing switch, the bottom of described check-valve type cementing switch is provided with single current valve seat, described single current valve seat comprises ball-and-seat and blind plugging, and the bottom of described blind plugging formula cementing switch is provided with blind plugging.
Preferably, described blind plugging formula cementing switch comprises blind plugging, impacting seat and the spring between the two, slips and cylindrical shell, and described cylindrical shell is followed successively by inner core, top connection and urceolus from inside to outside, and described top connection is provided with and closes cover near one end of blind plugging; Between described blind plugging and spring, slips, be slip spider, described blind plugging is fixed on spring and slips in slip spider; Described slip spider, inner core, close between adjacent the two of cover, top connection, urceolus and impacting seat and all reach sealing by sealing ring.
Preferably, described check-valve type cementing switch comprises single current valve seat, impacting seat and the spring between the two, slips and cylindrical shell, described cylindrical shell is followed successively by inner core, top connection and urceolus from inside to outside, and described top connection is provided with and closes cover near one end of single current valve seat; Described single current valve seat is provided with pressing plate, half ball seat and spacing fixed bar, fixed cover, axle and hemisphere between the two away from one end of impacting seat; Between described single current valve seat and spring, slips, be slip spider, described single current valve seat is fixed on spring and slips in slip spider; Described slip spider, inner core, close between adjacent the two of cover, top connection, urceolus and impacting seat and all reach sealing by sealing ring; Described pressing plate is fixed on fixed bar, and described fixed bar and half ball seat interfix, and described half ball seat is fixed in single current valve seat, between described hemisphere and axle, is fixedly connected with.
Preferably, the part that described inner core contacts with slip spider is provided with endoporus I, and the part that described inner core contacts with impacting seat is provided with endoporus II, and described top connection is provided with endoporus III, and described endoporus III is between endoporus I and endoporus II; Described slip spider is fixed in inner core endoporus I by cutting off, and described inner core is fixed in top connection endoporus III by cutting off, described in close cover be fixed in top connection by cutting off, described impacting seat is fixed in inner core endoporus II by cutting off.
Preferably, described packer is twin-stage open hole packer in parallel, described twin-stage open hole packer in parallel consists of screw thread parallel connection open hole packer I and open hole packer II, and described open hole packer I and open hole packer II adopt two cover control valve system independent controls respectively.
Preferably, described control valve system's upper and lower pressure reduction of employing and two kinds of control modes of inside and outside differential pressure.
Preferably, described open hole packer comprises packing element, and the two ends of described packing element are provided with shoulder protection device, and described shoulder protection device is steel bowl formula shoulder protrusion-resisting protective device.
Preferably, described bruising plug forms by dragging for axle, rubber cup and jam nut, and described rubber cup is threaded connection to be fixed on by jam nut and can drags in axle, and the quantity of described rubber cup is 5-8.
Preferably, described in, closing plug forms by firmly scraping plug and cork.
Preferably, described fishing device comprises guide shoe, gate ring, spiral slips, body, packing and top connection.Described guide shoe is threaded connection gate ring is fixed in body endoporus, and described spiral slips is that width is threaded with body, and can move forward and backward, and described packing is threaded connection and is fixed in body endoporus by top connection.
The first be for 1000 meters of well depths with interior horizontal well two-stage sealing bruising salvagable completion system, feature be simple in structure, operation is strict.Field conduct process pipe string is from top to bottom formed by connecting by sleeve pipe, blind plugging formula cementing switch, twin-stage open hole packer in parallel and screen casing successively.Cementing switch is connected to twin-stage open hole packer in parallel upper end, and blind plugging is arranged on the bottom of cementing switch, terminal sleeve on cementing switch, termination screen casing under twin-stage open hole packer in parallel.When setting of casing, need 10 one grouting, after putting in place, build the pressure under sleeve pipe, swollen envelope twin-stage open hole packer in parallel, opens cementing switch, note ash, throw plug, for slurry, bruising, close cementing switch, lower fishing socket salvaging pulls out of hole.
The second is that feature is complex structure, easy to operate for the horizontal well two-stage sealing bruising salvagable completion system between 1000～3000 meters of well depths.Field conduct process pipe string from top to bottom successively by sleeve pipe, check-valve type cementing switch,, twin-stage open hole packer in parallel and screen casing be formed by connecting.Cementing switch is connected to twin-stage open hole packer in parallel upper end, and ball-and-seat is arranged on the bottom of cementing switch, terminal sleeve on cementing switch, termination screen casing under twin-stage open hole packer in parallel.The fashionable mud grouting that do not need, after putting in place, builds the pressure under sleeve pipe down, and swollen envelope twin-stage open hole packer in parallel, opens cementing switch, notes ash, throws plug, replaces slurry, bruising, closes cementing switch, and under pulling out of hole, fishing socket is salvaged.While boring under this programme, without grouting, safety improves greatly.
The present invention also provides a kind of horizontal well to exempt to bore the cementing operation scheme of plug stage cementing completion system without inner tube.This cementing operation scheme is flat 1, flat 2 mainly for spring 10-22, flat 3 sandstone Gao Konggao ooze thin oil horizontal well.
This technique drilling process comprises that plug completion system is lowered to completion tubular column, swollen sealing tube external packer, opens cementing passage, circulation note ash is implemented well cementation, closes cementing passage, salvaged the implementation step of exempting to bore inner sleeve by exempting to bore, can complete smoothly drifting, and the injury of avoiding brill plug and washing well process to cause tubing string.
One, preliminary preparation:
1, check construction equipment: exempt from drill tools main body, cementing head and fishing tool.
2, exchange construction data: (1) obtains each bunch tube and the data of other instruments and the data of down-hole complex geological condition under construction well operation progress, construction well hole deviation data, the locator data of exempting to bore plug completion system, lower going-into-well; (2) provide and exempt to bore plug completion system master data, comprise that tool length, instrument external diameter, instrument stay well latus rectum and fishing tool external diameter etc.
3, exempt to bore cementing requirements: (1), above precision is considered sand sieve pipe, is exempted from drill tools below and added and be no less than 2 light pipes, to have prevented that cement from omitting screen casing; (2) to be selected in hole diameter good in cementing unit position, and angle is located gently; (3) cementing truck has been beaten after cement, and lower 10L clear water cleans the concrete grey of tube wall inner side, so that being lowered to smoothly of plug; (4) time is solidifying bled off pressure after 5 hours, and drilling team organizes in time salvages construction.
Two, the construction of completion practice
1, will exempt to bore plug completion system and be lowered to completion tubular column
(1) be lowered to and exempt to bore before completion system, carry out run through casing size with the jack rabbit of external diameter φ 121mm, to ensure cleaning into well, measuring accurately without flexural deformation and data of sleeve pipe; Locked rotating disk, fills mud by screen casing, requires to beat firm back-up tong when splicing sleeve, prevents pipe string rotation, ensures jail sealing on each junction button, to ensure to exempt from the quality of connection of drill tools simultaneously.
(2) will exempt to bore completion system and put into well under slowly steadily, prevent that wellhead assembly is to exempting to bore extruding and the collision of completion system.
2, swollen sealing tube external packer
Splicing sleeve cementing head, surface line and cementing equipment, the tube chamber of having friendly relations before pipeline connection prevents that foreign material from entering well.
(1) suppress and advance blind plugging device or single current valve seat to put in place with pump truck, and rise and be pressed onto 6MPa voltage stabilizing 5 minutes, to guarantee abundant swollen sealed packer; If there is step-down, ftercompction in time.
(2) continued to be pressed onto 8Mpa, voltage stabilizing 2 minutes, closes the swollen envelope passage of packing element (being packer hydrophthalmia passage).
3, open cementing passage
Continue to suppress 10～16MPa, in the time that the pressure moment that pump truck pressure meter shows starts to decline, sleeve pipe returns liquid outward, and cementing passage is opened (hydrophthalmia is opened, and sets up circulation), records opening pressure.
4, circulation note ash is implemented well cementation
Press normal procedure well cementation injected water mud, the slow turn on pump circulation of slush pump small displacement strengthens discharge capacity normal circulation after pressure stability.
5, close cementing passage
(1) beaten after cement paste, dismantled pipeline and clean ash, added 10L clear water to cook insulating liquid from cementing head, to discharge replacement plug, risen and press rear bruising 20MPa, pressure stability situation is observed in voltage stabilizing for 4 minutes simultaneously.
(2) release pressure to 10～12MPa, carries out secondary bruising to check whether really close, the additonal pressure of secondary bruising should be greater than 2～3MPa for the first time if closing cover; 8～10MPa10 minute with pressure subsequently.Incessantly press if steady, wait solidifying according to fluid column equilibrium pressure closing well.
6, salvage and exempt to bore inner sleeve
(1) accurately measure the depth of setting that calculates fishing socket, guarantee that every drilling tool internal diameter is unobstructed.
(2) connect and salvage drilling tool and go into the well, described drilling tool is the combination of " fishing socket+drill string+kelly bar ", transfers drilling tool and stops transferring to exempting from 600mm place, drill tools top, processes in sleeve pipe and starts the slow test of rotating disk until tandem position after remaining ash again.
(3) 5 tons of pressurizations, on propose drilling tool examination and carry 6 tons, continue to press down 7～8 tons, on formal, carry, weight indicator index 12～16 ton hours that raise on former load basis, weight indicator moment drops to former load, slowly transfers subsequently drill string to former salvaging position again, load does not reduce, and shows that exempting to bore inner sleeve picks up.
7, drifting construction requirement
Adopt φ 118mm milling cone or drill bit drifting to Multifunctional well-flushing valve top, pull out of hole.Drifting is to exempting from drill tools while transferring position, and if any being hampered, while blocking phenomenon, drilling tool lifts several times repeatedly, processes and can pass through.
Beneficial effect of the present invention:
(1) check-valve type cementing switch of the present invention is by adding ball-and-seat in the blind plugging at single current valve seat, realize systemic circulation passage, in circulation and fully ensure pit shaft and annular space U-shaped pipe pressure system when setting, eliminated cementing switch in the time that low pressure and easy leaking lost territory floor construct tool lower portion local depression district on starting setting pressure and opening the impact of noting grey channel pressure;
(2) twin-stage bore hole sealed packer of the present invention adopts two cover separate valves systems to control, two bore hole sealing cylinder base envelopes are to adopt parallel way, this structure is better for the compliance of complex situations, even if a packing element cannot be setting, can not affect the setting of another one packing element, the two protections of real realization yet;
(3) bore hole envelope control valve system's upper and lower pressure reduction of employing of the present invention and two kinds of control modes of inside and outside differential pressure, therefore, after only having the salvagable blind plugging of input to open open hole packer control valve to be feed pathway, pit shaft and annular pressure are poor while reaching certain value, and packer just carries out setting; Therefore be lowered in process at tubing string, this setting control mode can not cause mistake setting because being subject to the impacts such as tubing string pressure excitement;
(4) the packing element two ends of open hole packer of the present invention are provided with the protection of steel bowl formula shoulder protrusion-dispelling, when setting, steel bowl is together expanded with packing element, utilize rigid structures to realize support and grappling to packing element, improve packing element bearing capacity and enlarging rate, enlarging rate has been reached to 100% well compliance better;
(5) after shut-off plug bruising of the present invention, be integrated with blind plugging, only need once salvage, improved work limitation;
(6) plug of closing of the present invention adopts and firmly scrapes plug and the combining structure of cork, and it is residual that this combining structure can be struck off more thoroughly cement on casing wall in the time of tamponade; Adopt gel formula tamponade liquid simultaneously and mix retarding agent, can effectively remove cement residual, having avoided the cement deposition at shut-off plug top, can salvage after fully rinsing fish head;
(7) the present invention has obtained breakthrough in horizontal well bore hole sand control completion field, has promoted completion technique level, and the continuously steady production high yield in each oil field has been played to the effect of actively promoting.
Brief description of the drawings
Fig. 1 is the structural representation of blind plugging formula cementing switch of the present invention;
Fig. 2 is the structural representation of check-valve type cementing switch of the present invention;
Fig. 3 is the structural representation of twin-stage of the present invention open hole packer in parallel;
Fig. 4 is the structural representation of bruising plug of the present invention;
Fig. 5 is the structural representation of fishing socket of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described further.
Horizontal well two-stage sealing bruising salvagable completion system, comprises and exempts to bore plug device, bruising plug and fishing device, described in exempt to bore plug device and comprise cementing switch and packer; The upper end of described cementing switch is connected with sleeve pipe, and the lower end of described cementing switch is connected with the upper end of packer, and the lower end of described packer is connected with screen casing.
Described cementing switch is check-valve type cementing switch.Described check-valve type cementing switch comprises ball-and-seat 1-2, impacting seat 14 and the spring between the two 3, slips 4 and cylindrical shell, described cylindrical shell is followed successively by inner core 9, top connection 10 and urceolus 11 from inside to outside, and described top connection 10 is provided with and closes cover 7 near one end of single current valve seat 1-2; Described single current valve seat 1-2 is provided with pressing plate 16, half ball seat 22 and spacing fixed bar 17, fixed cover 18, axle 20 and hemisphere 21 between the two away from one end of impacting seat 14; Between described single current valve seat 1-2 and spring 3, slips 4, be slip spider 2, described single current valve seat 1-2 is fixed on spring 3 and slips 4 in slip spider 2; Described slip spider 2, inner core 9, close between the two adjacent with impacting seat 14 of cover 7, top connection 10, urceolus 11 and all reach sealing by sealing ring 6; Described pressing plate 16 is fixed on fixed bar 17, and described fixed bar 17 and half ball seat 22 interfix, and described half ball seat 22 is fixed in single current valve seat 1, between described hemisphere 21 and axle 20, is fixedly connected with.The part that described inner core 9 contacts with slip spider 2 is provided with endoporus I, and the part that described inner core 9 contacts with impacting seat 14 is provided with endoporus II, and described top connection 10 is provided with endoporus III, and described endoporus III is between endoporus I and endoporus II; Described slip spider 2 is fixed in inner core 9 endoporus I by cutting off 5, described inner core 9 is fixed in top connection 10 endoporus III by cutting off 12, the described cover 7 of closing is fixed in top connection 10 by cutting off 8, and described impacting seat 14 is fixed in inner core 9 endoporus II by cutting off 13.
Described packer is twin-stage open hole packer in parallel, described twin-stage open hole packer in parallel consists of screw thread parallel connection open hole packer I and open hole packer II, and described open hole packer I F1 and open hole packer II F2 adopt two cover control valve system independent controls respectively.Described control valve system's upper and lower pressure reduction of employing and two kinds of control modes of inside and outside differential pressure.Described open hole packer comprises packing element, and the two ends of described packing element are provided with shoulder protection device, and described shoulder protection device is steel bowl formula shoulder protrusion-resisting protective device.
Described bruising plug forms by dragging for axle J1, rubber cup J2 and jam nut J3, and described rubber cup J2 is threaded connection to be fixed on by jam nut J3 and can drags for axle J1 above, and the quantity of described rubber cup J2 is 5.
Described fishing device comprises guide shoe D1, gate ring D2, spiral slips D3, body D4, packing D5 and top connection D6.Described guide shoe D1 is threaded connection gate ring D2 is fixed in body D4 endoporus, and described spiral slips D3 is that width is threaded with body D4, and can move forward and backward, and described packing D5 is threaded connection and is fixed in body D4 endoporus by top connection D6.
The present invention also provides a kind of horizontal well to exempt to bore the cementing operation scheme of plug stage cementing completion system without inner tube.This cementing operation scheme is flat 1, flat 2 mainly for spring 10-22, flat 3 sandstone Gao Konggao ooze thin oil horizontal well.
This technique drilling process comprises that plug completion system is lowered to completion tubular column, swollen sealing tube external packer, opens cementing passage, circulation note ash is implemented well cementation, closes cementing passage, salvaged the implementation step of exempting to bore inner sleeve by exempting to bore, can complete smoothly drifting, and the injury of avoiding brill plug and washing well process to cause tubing string.
One, preliminary preparation:
1, check construction equipment: exempt from drill tools main body, cementing head and fishing tool.
2, exchange construction data: (1) obtains each bunch tube and the data of other instruments and the data of down-hole complex geological condition under construction well operation progress, construction well hole deviation data, the locator data of exempting to bore plug completion system, lower going-into-well; (2) provide and exempt to bore plug completion system master data, comprise that tool length, instrument external diameter, instrument stay well latus rectum and fishing tool external diameter etc.
3, exempt to bore cementing requirements: (1), above precision is considered sand sieve pipe, is exempted from drill tools below and added and be no less than 2 light pipes, to have prevented that cement from omitting screen casing; (2) to be selected in hole diameter good in cementing unit position, and angle is located gently; (3) cementing truck has been beaten after cement, and lower 10L clear water cleans the concrete grey of tube wall inner side, so that being lowered to smoothly of plug; (4) time is solidifying bled off pressure after 5 hours, and drilling team organizes in time salvages construction.
Two, the construction of completion practice
1, will exempt to bore plug completion system and be lowered to completion tubular column
(1) be lowered to and exempt to bore before completion system, carry out run through casing size with jack rabbit, to ensure cleaning into well, measuring accurately without flexural deformation and data of sleeve pipe; Locked rotating disk, fills mud by screen casing, requires to beat firm back-up tong when splicing sleeve, prevents pipe string rotation, ensures jail sealing on each junction button, to ensure to exempt from the quality of connection of drill tools simultaneously.
(2) will exempt to bore completion system and put into well under slowly steadily, prevent that wellhead assembly is to exempting to bore extruding and the collision of completion system.
2, swollen sealing tube external packer
Splicing sleeve cementing head, surface line and cementing equipment, the tube chamber of having friendly relations before pipeline connection prevents that foreign material from entering well.
(1) suppress and advance blind plugging device or single current valve seat to put in place with pump truck, and rise and be pressed onto 6MPa voltage stabilizing 5 minutes, to guarantee abundant swollen sealed packer; If there is step-down, ftercompction in time.
(2) continued to be pressed onto 8Mpa, voltage stabilizing 2 minutes, closes the swollen envelope passage of packing element (being packer hydrophthalmia passage).
3, open cementing passage
Continue to suppress 10～16MPa, in the time that the pressure moment that pump truck pressure meter shows starts to decline, sleeve pipe returns liquid outward, and cementing passage is opened (hydrophthalmia is opened, and sets up circulation), records opening pressure.
4, circulation note ash is implemented well cementation
Press normal procedure well cementation injected water mud, the slow turn on pump circulation of slush pump small displacement strengthens discharge capacity normal circulation after pressure stability.
5, close cementing passage
(1) beaten after cement paste, dismantled pipeline and clean ash, added 10L clear water to cook insulating liquid from cementing head, to discharge replacement plug, risen and press rear bruising 20MPa, pressure stability situation is observed in voltage stabilizing for 4 minutes simultaneously.
(2) release pressure to 10～12MPa, carries out secondary bruising to check whether really close, the additonal pressure of secondary bruising should be greater than 2～3MPa for the first time if closing cover; 8～10MPa10 minute with pressure subsequently.Incessantly press if steady, wait solidifying according to fluid column equilibrium pressure closing well.
6, salvage and exempt to bore inner sleeve
(1) accurately measure the depth of setting that calculates fishing socket, guarantee that every drilling tool internal diameter is unobstructed.
(2) connect and salvage drilling tool and go into the well, described drilling tool is the combination of " fishing socket+drill string+kelly bar ", transfers drilling tool and stops transferring to exempting from 600mm place, drill tools top, after processing the interior remaining ash of sleeve pipe, then starts the slow test of rotating disk, until tandem position.
(3) 5 tons of pressurizations, on propose drilling tool examination and carry 6 tons, continue to press down 7～8 tons, on formal, carry, weight indicator index 12～16 ton hours that raise on former load basis, weight indicator moment drops to former load, slowly transfers subsequently drill string to former salvaging position again, load does not reduce, and shows that exempting to bore inner sleeve picks up.
7, drifting construction requirement
Adopt φ 118mm milling cone or drill bit drifting to Multifunctional well-flushing valve top, pull out of hole.Drifting is to exempting from drill tools while transferring position, and if any being hampered, while blocking phenomenon, drilling tool lifts several times repeatedly, processes and can pass through.
51/2 ＂ exempts to bore technical data 7 ＂ and exempts to bore technical data
Claims (8)
1. horizontal well two-stage sealing bruising salvagable completion system, comprises and exempts to bore plug device, bruising plug and fishing device, described in exempt to bore plug device and comprise cementing switch and packer; The upper end of described cementing switch is connected with sleeve pipe, the lower end of described cementing switch is connected with the upper end of packer, the lower end of described packer is connected with screen casing, it is characterized in that: described cementing switch is check-valve type cementing switch, the bottom of described check-valve type cementing switch is provided with single current valve seat (1-2), and described single current valve seat (1-2) comprises ball-and-seat and blind plugging.
2. horizontal well two-stage sealing bruising salvagable completion system according to claim 1, it is characterized in that: described check-valve type cementing switch comprises single current valve seat (1-2), impacting seat (14) and the spring between the two (3), slips (4) and cylindrical shell, described cylindrical shell is followed successively by inner core (9), top connection (10) and urceolus (11) from inside to outside, and described top connection (10) is provided with and closes cover (7) near one end of single current valve seat (1-2); Described single current valve seat (1-2) is provided with pressing plate (16), half ball seat (22) and spacing fixed bar (17), fixed cover (18), axle (20) and hemisphere (21) between the two away from one end of impacting seat (14); Between described single current valve seat (1-2) and spring (3), slips (4), be slip spider (2), described single current valve seat (1-2) is fixed on spring (3) and slips (4) in slip spider (2); Described slip spider (2), inner core (9), close between the two adjacent with impacting seat (14) of cover (7), top connection (10), urceolus (11) and all reach sealing by sealing ring (6); It is upper that described pressing plate (16) is fixed on fixed bar (17), and described fixed bar (17) interfixes with half ball seat (22), and described half ball seat (22) is fixed in single current valve seat (1-2), between described hemisphere (21) and axle (20), is fixedly connected with.
3. horizontal well two-stage sealing bruising salvagable completion system according to claim 2, it is characterized in that: described inner core (9) is provided with endoporus I with the part that slip spider (2) contacts, described inner core (9) is provided with endoporus II with the part that impacting seat (14) contacts, described top connection (10) is provided with endoporus III, and described endoporus III is between endoporus I and endoporus II; Described slip spider (2) is fixed in inner core (9) endoporus I by cutting off (5), described inner core (9) is fixed in top connection (10) endoporus III by cutting off (12), the described cover (7) of closing is fixed on top connection (10) above by cutting off (8), and described impacting seat (14) is fixed in inner core (9) endoporus II by cutting off (13).
4. horizontal well two-stage sealing bruising salvagable completion system according to claim 2, it is characterized in that: described packer is twin-stage open hole packer in parallel, described twin-stage open hole packer in parallel is by open hole packer I(F1) and open hole packer II(F2) compose in parallel described open hole packer I(F1) and open hole packer II(F2) adopt two to overlap control valves system independent control respectively.
5. horizontal well two-stage sealing bruising salvagable completion system according to claim 5, is characterized in that: described control valve system's upper and lower pressure reduction of employing and two kinds of control modes of inside and outside differential pressure.
6. according to the horizontal well two-stage sealing bruising salvagable completion system described in claim 4 or 5; it is characterized in that: described open hole packer comprises packing element; the two ends of described packing element are provided with shoulder protection device, and described shoulder protection device is steel bowl formula shoulder protrusion-resisting protective device.
7. horizontal well two-stage sealing bruising salvagable completion system according to claim 2, it is characterized in that: described bruising plug forms by dragging for axle (J1), rubber cup (J2) and jam nut (J3), described rubber cup (J2) is fixed on and can be dragged for axle (J1) above by jam nut (J3), and the quantity of described rubber cup (J2) is 5-8.
8. horizontal well two-stage sealing bruising salvagable completion system according to claim 2, it is characterized in that: described fishing device comprises guide shoe (D1), gate ring (D2), spiral slips (D3), body (D4), packing (D5) and top connection (D6), described gate ring (D2) is fixed in body (D4) by guide shoe (D1), described packing (D5) is fixed in body (D4) by top connection (D6), and described spiral slips (D3) and body (D4) are connected for packaged type.
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| CN104110234A (en) * | 2014-07-31 | 2014-10-22 | 于世江 | Method for well cementation drilling-free blind plate circulating well cementation of horizontal well |
| CN109267954A (en) * | 2018-09-20 | 2019-01-25 | 明士皓 | The safe tripping in of oil production by layer packer and anti-pollution salvaging dual-purpose apparatus |
| CN109306855A (en) * | 2018-09-18 | 2019-02-05 | 中国石油集团西部钻探工程有限公司 | The completion method for tail of two stage cementing at the top of screen casing |
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| WO2019085472A1 (en) * | 2017-11-03 | 2019-05-09 | 中国海洋石油集团有限公司 | Tubular column for drill-free and catch-free integrated well cementing and well completion and application thereof |
| US11661813B2 (en) | 2020-05-19 | 2023-05-30 | Schlumberger Technology Corporation | Isolation plugs for enhanced geothermal systems |
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