CN101482001B - Rubber plug system used for drilling liner cementing of horizontal well - Google Patents
Rubber plug system used for drilling liner cementing of horizontal well Download PDFInfo
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- CN101482001B CN101482001B CN2008100560506A CN200810056050A CN101482001B CN 101482001 B CN101482001 B CN 101482001B CN 2008100560506 A CN2008100560506 A CN 2008100560506A CN 200810056050 A CN200810056050 A CN 200810056050A CN 101482001 B CN101482001 B CN 101482001B
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Abstract
The invention provides a rubber plug system for drilling liner cementing of a horizontal well and relates to the technical field of drilling. The rubber plug system comprises a rubber plug assembly and a pressure-building base; the rubber plug assembly comprises a tail-tube closing rubber plug and a lower rubber plug which are connected with pins, and the tail-tube closing rubber plug is connected with a base pipe of a tail tube running tool by a joint and a connecting sleeve. A ball-tripping device is arranged in an inner hole of the lower rubber plug for capturing ant throwing the ball, building the pressure and carrying out base hanging of a hanger; then, the tail tube is separated, and the rubber plug is closed; an internal sleeve of a two-stage cementing device is adopted for reaching the pressure-building base in a casing collar above a sieve pipe, and locking and sealing are carried out, so as to seal the base and open the two-stage cementing device; the tail-tube closing rubber plug can be locked and sealed with the rubber plug of a drilling pipe, the pressure is built, the base pipe is separated, cement slurry in the tail tube is replaced, and a circulation hole of the two-stage cementing device is permanently closed. The rubber plug system can ensure that the tail tube can smoothly enter into and each set of tool can smoothly realize the functions, thus avoiding the problem that the two-stage cementing device is opened ahead of time or can not be closed and the like and improving the reliability and the efficiency of well cementing.
Description
Technical field
The present invention relates to the used a kind of rubber plug system of cementing technology in the oil drilling, say further, relate to a kind of rubber plug system that is used for by horizontal well tail pipe, two-stage cementing tool and external packer of pipe combination well cementation mode.
Background technology
In field of oil drilling, sieve tube completion has been brought into play the production capacity on stratum preferably, and is single at payzone, in the absence of other water layer, need not be lowered to packer or annular injection cement.But mostly need be under the situation at screen casing crest water flooding mud; And in order to prevent that cement paste from sinking; Guarantee annular space packing effect, often need add external packer of pipe, also need a Hydraulic Two-stage Cementing Tool simultaneously at the screen casing top; And in most cases whole pipe string also belongs to tail pipe, and that is to say also needs an extension hanger.Many horizontal wells like the Ta Bei oil field all adopt this completion mode.In addition, for the well that has the drop ply situation, this completion mode of using extension hanger, two-stage cementing tool and external packer of pipe simultaneously of also normal employing.Once repeatedly adopted this mode like Shengli Oil Field, Zang Bei oil field etc.The pipe string arrangement mode of this completion mode is a (see figure 1): float shoe 49+ screen casing 44 (or tail pipe string 45)+blind plate 48+ external packer of pipe 42+ two-stage cementing tool 41+ float collar 43+ tail pipe string 45+ tail pipe plug 47+ extension hanger 50.Its operation procedure is: the pipe string behind the precalculated position, is filled mud down, and turn on pump builds the pressure, and seat extension hanger continues to build the pressure; Base sealed packer, build the pressure open two-stage cementing tool after, back-off, cementing; For slurry, bruising is prevented back pressure by float collar at last, and two-stage cementing tool can't be closed.This method is that blind plate and float collar acting in conjunction realize the form of structure that two-stage cementing tool is opened and the float collar replacement is closed; Though on-the-spot use is more; But the problem that occurs is quite a few, as refer at tower, the situation that two-stage cementing tool is opened in advance or under low pressure opened in the going down process all appearred in system in Tahe Oilfield.Its reason possibly be that the fluid power impact causes, because pipe string lower end is a blind plate, the upper end is a float collar, manages the interior airtight relatively pressure " dead space " that forms therebetween, and the repeatedly fluid power in the setting of casing process impacts, and often causes two-stage cementing tool to open in advance.
On this basis, the on-the-spot combination for the pipe string adjusted, and removed the float collar above the two-stage cementing tool, removes to close the two-stage cementing tool circulation port with the tail pipe plug.Pipe string arrangement mode is a (see figure 2): screen casing 44+ blind plate 48+ external packer of pipe 42+ two-stage cementing tool 41+ tail pipe plug 47+ extension hanger 50.This method uses blind plate and the acting in conjunction of tail pipe plug plug to realize the form of structure that two-stage cementing tool is opened and closed; In use, its success rate increases, but still has following problem: 1. because the blind plate existence; When the pipe string is hampered, can not be through the circulant solution resistance; 2. because the existence of blind plate seals in the well process at pipe, the situation that two-stage cementing tool is opened in advance happens occasionally.
Two kinds of structures of the above prior art are all used the structure of blind plate, and its integral body realizes easily that in being lowered to process pressure agitates, and makes two-stage cementing tool the phenomenon of opening in advance occur.Open two-stage cementing tool in advance for fear of the fluid power impact, the two-stage cementing tool manufacturer that has has changed the direction of opening of opening cover, but this is not the fundamental way of dealing with problems, in a word, and the ideal method that does not also address this problem at present.
Summary of the invention:
To thoroughly stop the hydraulic pressure shock problem, must solve seal-off pressure chamber problem, that is to say and remove blind plate.But, remove blind plate after, will face a new problem again, be exactly: build-up pressure how in horizontal well, hang hanger, base sealed packer and open two-stage cementing tool with toilet seat.In whole pipe string, Hydraulic Two-stage Cementing Tool, external packer of pipe are in horizontal segment, and the top that the seat that therefore builds the pressure should be positioned at screen casing is the bottom of whole pipe string, if press the usual manner pitching, even pumping, ball also is difficult for arriving the seat that builds the pressure and puts; In addition, because pitching will be passed through cover in the two-stage cementing tool, the internal diameter varies of cover is big in the two-stage cementing tool, pitching easily and two-stage cementing tool bump and open the pressure transmission hole of two-stage cementing tool in advance.For this reason, the present invention removing under the situation of blind plate, can solve the problem that builds the pressure in the horizontal well through the special-purpose rubber plug system of design one cover, can prevent the closing problem in advance of two-stage cementing tool again.
The object of the present invention is to provide a cover rubber plug system, be applied to well cementation of horizontal well screen casing or absorption well well cementation, change the conventional cementing mode, avoided problem or the hidden danger brought by blind plate thereby be able to cancel blind plate.
A kind of rubber plug system that is used for the horizontal well drilling liner cementing of the present invention comprises the plug assembly and builds the pressure seat.Wherein the plug assembly is connected the lower end of tail pipe running tool central tube.Build the pressure among the present invention the seat put with prior art in build the pressure the seat the position identical, be positioned at the casing coupling above the screen casing.With between the sleeve pipe that casing coupling is connected up and down certain clearance is arranged, the seat that builds the pressure leans on then up and down that two sleeve pipes are fixed.
Wherein said plug assembly comprises that the tail pipe that is linked in sequence together with same axis, from the top down closes plug and bottom plug.Plug closed by said tail pipe and bottom plug is cylinder mode.
Wherein tail pipe connects with tail pipe running tool central tube lower ends on closing plug, and when building the pressure to a certain degree, tail pipe is closed plug and can be broken away from tail pipe running tool central tube.Tail pipe is closed the minimum diameter of plug cylinder inboard wall greater than the pitching diameter, makes pitching directly to close plug through tail pipe and arrives bottom plug.
Wherein said bottom plug upper end is closed the plug lower ends with tail pipe and is connect.Be provided with the device of blocking in the bottom plug endoporus, the device of blocking adopts common structure in the prior art, like the device of being mentioned among the Chinese patent ZL 02288900.0 etc. of blocking.In the bottom plug endoporus aperture gradual change of the device lower end of blocking to less than bulb diameter, can be in the bottom plug endoporus with the ball retaining.When pitching keeps off in the bottom plug endoporus, begin to build the pressure.When building the pressure to a certain degree, bottom plug can be closed plug with tail pipe and broken away from.Also be provided with sealing ring and snap ring on the outer wall of bottom plug lower end, can with a lock sealing that builds the pressure.
The wherein said seat that builds the pressure is a cylinder mode.Its inwall middle part is provided with a little conical surface, the lower end of the little conical surface, and inner hole wall is provided with a groove; After the disengaging of the bottom plug in plug assembly tail pipe is closed plug; Move position so far; Snap ring on the bottom plug outer wall will stick in the groove of an inwall that builds the pressure; Sealing ring on the bottom plug outer wall will be fitted with a conelet face at inwall middle part that builds the pressure and sealed, and bottom plug and seat locking and the sealing of building the pressure can play the effect of building the pressure thus.
The more preferably scheme of rubber plug system of the present invention is described below on above basis:
Rubber plug system of the present invention also includes joint and adapter sleeve.Joint and adapter sleeve are cylinder mode.The inwall minimum diameter of joint and adapter sleeve makes pitching directly to pass through all greater than the pitching diameter.Tail pipe in the above plug assembly is closed plug and is connected with tail pipe running tool central tube with adapter sleeve through joint: joint cylindrical shell upper end is inserted in the lower end of tail pipe running tool central tube, and to be threaded; Be inserted on the adapter sleeve cylindrical shell and to be threaded joint cylindrical shell lower end; The inwall of adapter sleeve cylindrical shell lower end is provided with the ramp type half the circumference of the sleeve where it joins the shoulder; Close the same cross-section location in plug barrel upper end at said tail pipe and be provided with some through holes; Embed block in the through hole; Tail pipe is closed plug and is stuck on the ramp type half the circumference of the sleeve where it joins the shoulder of above-mentioned adapter sleeve cylindrical shell lower end inwall through block, thereby is connected with tail pipe running tool central tube.Joint proposes after adapter sleeve can be cemented the well with running tool.
Above-described tail pipe is closed plug and is included body, interior cover and tail pipe and close the plug guide head, and the three is cylinder mode.The lower end of body cylindrical shell is inserted in tail pipe and is closed plug guide head upper end, between through being threaded.Said tail pipe is closed the plug guide head and is preferably the cylindrical structure that a lower end outer wall is the inverted cone surface structure, and the inverted cone surface structure plays guide effect.Through guide effect, after drilling rod plug and tail pipe plug were compound, drilling rod plug and tail pipe plug were under the replacement effect of mud, and it is placed in the middle in two-stage cementing tool, overlapping tail pipe to be closed plug.
Be with interior cover in the said body endoporus, outer wall of inside race is that clearance-type cooperates with inner body wall, and its part that is nested is provided with sealing.The cylindrical shell top of body and interior cover links together through shear pin.Tail pipe is closed the interior cover of plug lower surface and is positioned at the top that tail pipe is closed the rubber plug body lower surface, and is inverted cone surface.The upper end of said body cylindrical shell is in the part that is nested with interior cover; Be provided with some through holes in same cross-section location on its barrel; Embed block in the through hole, body is stuck in through block on the ramp type half the circumference of the sleeve where it joins the shoulder of said adapter sleeve cylindrical shell lower end inwall, comes off in advance to prevent tail pipe shut-off plug body.The inwall of said joint cylindrical shell lower end is provided with half the circumference of the sleeve where it joins the shoulder, and it is identical that the joint cylinder internal diameter below the last half the circumference of the sleeve where it joins the shoulder and tail pipe are closed the interior set upper side of plug external diameter; Closing rubber plug body when tail pipe is stuck on the ramp type half the circumference of the sleeve where it joins the shoulder of adapter sleeve inwall lower end; When the joint lower end screws in the adapter sleeve inwall; Tail pipe is closed the interior set upper side of plug and is inserted in joint cylindrical shell lower end, the upper surface of cover in joint lower end inwall upper shoulder withstands on, thereby with body-fixed.Tail pipe is closed the interior set upper side of plug outer wall and is cooperated with joint cylindrical shell lower end inwall formation clearance-type, and is provided with sealing.
Mainly to act on be isolated water mud and mud and scraping drilling rod inwall to the drilling rod plug in the prior art, under the pressure effect of mud, when drilling rod plug cement paste in the descending replacement tail pipe after the tail pipe plug is compound.The bottom of closing plug inner sleeve body inwall at tail pipe described in the rubber plug system of the present invention is provided with an inverted cone surface, the interior cover inwall under the inverted cone surface with will be descending so far drilling rod plug guide head outer wall form clearance-type and cooperate.When the drilling rod plug is advanced into tail pipe and closes plug in that the impetus of mud pressure is following; After overlapping the lower surface in drilling rod plug guide head passes; Jump ring on the guide head flicks; On the inverted cone surface of the lower surface of cover, prevent that the drilling rod plug from falling back in being stuck in, the sealing ring on the guide head outer wall of interior simultaneously cover lower end inwall and drilling rod plug forms sealing.
The body outer wall that above-described tail pipe is closed plug can also be with one or more tail pipes and close plug glue wrist, plays centralizing function in its descending process, and the guide head that makes tail pipe close plug can not bump with two-stage cementing tool in descending process.This glue bowl adopts vulcanizate, and glue bowl the rim of a bowl makes progress, and the rim of a bowl outside dimension is decided according to the tail pipe specification, and greater than the tail pipe internal diameter.
The above tail pipe is closed can also be provided with ring-type dish cushion rubber on the outer wall of plug guide head.The dish mouth upwards plays the one-way sealing effect.Dish cushion rubber external diameter is decided according to cover size in the two-stage cementing tool, greater than overlapping internal diameter in the two-stage cementing tool.When the tail pipe shut-off plug move to two-stage cementing tool close obturating plug compound after; The dish cushion rubber under the effect of mud and pressure with close obturating plug inner cylinder face formation and seal; Build-up pressure is cut off and is closed obturating plug and close the shear pin that cover is connected; Thereby behind cemented up, close the two-stage cementing tool circulation port voluntarily, realize closing motion.
In the plug assembly of rubber plug system of the present invention, said bottom plug comprises overcoat, axle and bottom plug guide head, and the three is cylinder mode.The cylindrical shell upper end of said overcoat is enclosed within tail pipe and closes in the plug guide head endoporus, connects through pin.It is that clearance-type cooperates that the cylindrical shell upper end outer wall of overcoat is closed plug guide head endoporus inwall with tail pipe, and its part that is nested is provided with sealing.The lower end of overcoat cylindrical shell is inserted in the upper end of said axle cylindrical shell, and to be threaded, the part that is nested of overcoat cylindrical shell lower end and axle cylindrical shell upper end is provided with sealing.The top, upper surface of outer casing inner wall middle part, axle is provided with the device of blocking.The upper end inwall of axle cylindrical shell is an inverted cone surface, and conical surface upper-end inner diameter is greater than the ball external diameter, and conical surface bottom diameter can be caught pitching, and be fixed in the bottom plug less than the ball external diameter with the pitching retaining herein smoothly, moves to the seat that builds the pressure until bottom plug and puts.When pitching keeps off in the bottom plug endoporus, begin to build the pressure.When building the pressure to a certain degree, the outer set upper side of bottom plug and tail pipe are closed the pin that plug guide head endoporus is connected and are cut off, can be descending thereby make bottom plug and tail pipe close the plug disengaging.The lower end of axle cylindrical shell is inserted in the upper end of bottom plug guide head and to be threaded, the part that is nested of axle cylindrical shell lower end and bottom plug guide head upper end is provided with sealing.Bottom plug guide head outer wall is provided with bottom plug guide head sealing ring, and its below is provided with snap ring, can lock and sealing with the seat that builds the pressure, and realizes sealing, the effect of building the pressure simultaneously, and has anti-back pressure effect.The bottom plug guide head is preferably the cylindrical structure that a cylindrical shell lower end outer wall is inverted cone surface, and guide effect is played in the lower end of inverted cone surface structure.
Can also be with one or more bottom plug glue wrists on the outer wall of above-described bottom plug axle, can play centralizing function, bottom plug can not bumped with two-stage cementing tool in descending process in its descending process.This glue bowl adopts vulcanizate, and glue bowl the rim of a bowl makes progress, and the rim of a bowl outside dimension is greater than the tail pipe internal diameter.Its endoporus upper end of seat that builds the pressure described in the rubber plug system of the present invention can be designed to a big conical surface, cooperates said bottom plug guide head to insert the seat that builds the pressure.
Adopt rubber plug system of the present invention when the horizontal well drilling liner cementing, its operation procedure is: down to design attitude, from the well head pitching, when ball arrival bottom plug position, pressure rises with tail pipe, carries out seat and hangs operation (perhaps carrying out seat through mechanical system hangs); After seat is hung successfully, continue to build the pressure and cut off bottom plug and close the pin that the plug guide head is connected with tail pipe, bottom plug firmly grasp ball and with one of which with descending, pass tail pipe, two-stage cementing tool and the external packer of pipe arrival seat that builds the pressure and put.Pressure rises, base sealed packer; Continue to build the pressure, open the two-stage cementing tool circulation port, carry out cementing job.After the cement paste injection finishes; Be pressed into the drilling rod plug; Close the plug position when the drilling rod plug arrives tail pipe under the mud pressure effect, two plugs are combined with each other, and cut off tail pipe and close the shear pin that the inner sleeve body top of plug is connected with body; Interior cover comes downwards to tail pipe and closes in the plug guide head; Its upper surface moves under the block of body, and block is shrinking in the cylindrical shell of body under the effect of mud equal pressure, and this moment, the tail pipe shut-off plug was with the adapter sleeve disengaging and with the cement paste in the descending replacement tail pipe of drilling rod plug.When arriving the two-stage cementing tool position, close circulation port with the compound tail pipe shut-off plug of drilling rod plug.Thereby accomplish that packer set, hanger seat are hung, twin-stage opens and cement operations such as close.
Rubber plug system of the present invention can easily be realized being lowered to of tail pipe, implements to build the pressure, and accomplishes smoothly a seat extension hanger, base sealed packer and opens action such as two-stage cementing tool.Rubber plug system of the present invention is used for the horizontal well drilling liner cementing, has solved that the prior art tail pipe is lowered to that inefficacy, the two-stage cementing tool that can not circulate, under the situation of many cover tool combinations well cementation, cause easily certain cover instrument of being hampered in the process opened in advance and circulation port such as can not close at problem.Use this rubber plug system can guarantee being lowered to smoothly of tail pipe and every cover instrument realization function separately smoothly, thereby improved the reliability and well cementation efficient of well cementation, cement the well and put the axe in the helve, have great popularizing application prospect for the well cementation of in-situ horizontal well, absorption well.
Description of drawings
Fig. 1 is the pipe string arrangement mode sketch map of a kind of completion method in the prior art.
Fig. 2 is the pipe string arrangement mode sketch map of another kind of completion method in the prior art.
Fig. 3 is the pipe string arrangement mode sketch map of the completion method of employing rubber plug system of the present invention.
Fig. 4 is a drilling well plug structural representation in the prior art.
Fig. 5 is the structural representation of rubber plug system center tap of the present invention, adapter sleeve and plug assembly.
Fig. 6 is the holder structure sketch map that builds the pressure in the rubber plug system of the present invention.
The specific embodiment:
Below in conjunction with embodiment, further specify the present invention.
Syndeton of closing plug 30 and bottom plug 40 for the tail pipe in joint 10, adapter sleeve 20 and the plug assembly in the rubber plug system of the present invention shown in Figure 5.Joint 10 is cylinder mode with adapter sleeve 20.The inwall minimum diameter of joint 10 and adapter sleeve 20 is all greater than the diameter of pitching 27.Joint all is threaded on the outer wall of two ends about in the of 10, and the lower end of joint 10 upper parts and tail pipe running tool central tube to be being threaded, and the inwall of its end portion and adapter sleeve 20 is to be threaded.The lower end of adapter sleeve 20 inwalls is provided with ramp type half the circumference of the sleeve where it joins the shoulder 8.
Tail pipe as shown in Figure 5 is closed plug 30 and is included body 13, interior cover 9 and tail pipe and close plug guide head 26, and the three is cylinder mode.The upper end of said body 13 cylindrical shells is in the part that is nested with interior cover 9; Be provided with some through holes in same cross-section location on its barrel; Embed block 7 in the through hole, the body 13 that tail pipe is closed plug is stuck on the ramp type half the circumference of the sleeve where it joins the shoulder 8 of above-mentioned adapter sleeve 20 inwall lower ends through block 7.Cover 9 in being with in body 13 endoporus, interior cover 9 outer walls are that clearance-type cooperates with body 13 inwalls.In its part that is nested, outer wall of inside race is provided with sealing ring and realizes sealing.Body 13 links together through shear pin 12 with the cylindrical shell top of interior cover 9.The inwall of said joint 10 cylindrical shell lower ends is provided with half the circumference of the sleeve where it joins the shoulder 6, and it is identical that joint 10 cylinder internal diameters of last half the circumference of the sleeve where it joins the shoulder below 6 and tail pipe are closed in the plug cover 9 upper end external diameters; Closing rubber plug body 13 when tail pipe is stuck on the ramp type half the circumference of the sleeve where it joins the shoulder 8 of adapter sleeve 20 inwall lower ends; When joint 10 lower ends screw in adapter sleeve 20 inwalls; Tail pipe is closed the interior cover of plug 9 upper ends and is inserted in joint cylindrical shell 10 lower ends; The upper surface of cover 9 in joint 10 lower end inwall upper shoulders 6 withstand on, thus body 13 is fixing.Tail pipe is closed the interior cover of plug 9 upper end outer walls and is cooperated with joint 10 cylindrical shell lower end inwalls formation clearance-types, and is provided with sealing.Body 13 lower end outer walls are provided with screw thread, and the inwall that tail pipe is closed plug guide head 26 upper ends is provided with the screw thread that is mated, and plug guide head 26 upper ends are closed through being threaded with tail pipe in body 13 lower ends thus.Close the plug guide head 26 upper ends part that is nested at body 13 cylindrical shell lower ends and tail pipe, be provided with sealing ring in body 13 outer walls and realize sealing.It is the cylindrical structure that a lower end outer wall is inverted cone surface that tail pipe is closed plug guide head 26.Body 13 outer walls that tail pipe is closed plug are with the tail pipe of whole sulfuration and close plug glue wrist 14, are made up of several the rims of a bowl.Glue bowl 14 the rims of a bowl make progress, and the rim of a bowl outside dimension can play centralizing function in its descending process greater than the tail pipe internal diameter, also have scraping mud and sealing function simultaneously.Tail pipe is closed and also is provided with ring-type dish cushion rubber 21 on the outer wall of plug guide head 26, the dish mouth upwards, outside dimension is greater than overlapping internal diameter in the two-stage cementing tool.When tail pipe close plug 30 move to two-stage cementing tool close obturating plug compound after; Dish cushion rubber 21 is under the effect of mud and pressure and close obturating plug inner cylinder face formation one-way sealing; Cut off and close obturating plug and close the shear pin that cover is connected, thereby realize closing the action of two-stage cementing tool.
Fig. 4 is a conventional drilling rod plug 101 in the prior art, and its front end is a drilling rod plug guide head 1, and drilling rod plug guide head 1 is provided with drilling rod plug sealing ring 2, and its below is provided with jump ring 3.The bottom that tail pipe among Fig. 5 is closed cover 9 inwalls in the plug is provided with an inverted cone surface, and interior cover 9 internal diameters under the inverted cone surface equal the external diameter of sealing ring on the drilling rod plug guide head.When inject cement paste finish be pressed into drilling rod plug 101 after, promote down at mud pressure, when the drilling rod plug ran to rubber plug system, drilling rod plug guide head 1 entered into the rubber plug system tail pipe and closes the interior interior cover 9 of plug 30.Play position-limiting action on the inverted cone surface of cover 9 inside in the inverted cone surface of drilling rod plug guide head 1 head is stuck at this moment; Cover 9 was the lower surface 17 times of inverted cone surface in jump ring 3 ran to; Jump ring 3 opens, and prevents to fall back, and drilling rod plug sealing ring 2 forms sealing with interior cover 9 lower end inwalls.
Fig. 6 is the seat 103 that builds the pressure in the rubber plug system of the present invention.Seat 103 its endoporus upper end that builds the pressure is designed with a big conical surface, cooperates the said bottom plug guide head 37 insertions seat that builds the pressure.The seat 103 endoporus middle part that builds the pressure is provided with conelet face 38, and its lower end is provided with groove 39, and when bottom plug 40 moves position so far, snap ring 36 will stick in the groove 39, sealing ring 35 will with the conical surface 38 sealings.
As shown in Figure 3, be the pipe string arrangement mode of the completion method that adopts rubber plug system of the present invention: a screen casing 44+ float collar 43+ 103+ casing coupling 104+ external packer of pipe 42+ two-stage cementing tool 41+ tail pipe string 45+ rubber plug system of the present invention (tail pipe is closed plug 30 and the bottom plug 40)+tail pipe running tool central tube 46+ extension hanger 50 that builds the pressure.The said tail pipe that comprises is closed the plug assembly and tail pipe running tool central tube 46 lower ends of plug 30 and bottom plug 40 and is connect.In the casing coupling 104 that the seat 103 that builds the pressure is arranged between the sleeve pipe.Adopt rubber plug system of the present invention when the horizontal well drilling liner cementing; Its operation procedure is: tail pipe is arrived design attitude down, from the well head pitching, in the device of blocking in ball arrives bottom plug 40; Pressure rises, and carries out seat and hangs operation (perhaps carrying out seat through mechanical system hangs); After seat is hung successfully; Continue to build the pressure and cut off bottom plug overcoat 23 upper ends and close the pin 25 that plug guide head 26 endoporus are connected with tail pipe; Bottom plug 40 promptly ball and with one of which with descending, pass tail pipe string 45, two-stage cementing tool 41 and external packer of pipe 42 and arrive seat 103 positions that build the pressure.Pressure continues to rise base sealed packer; Continue to build the pressure, open two-stage cementing tool 41 circulation ports, carry out cementing job.After the cement paste injection finishes, be pressed into drilling rod plug 101, when arriving tail pipe, the drilling rod plug closes the plug position, and two plugs are compound.Build the pressure; Cut off the shear pin 12 that cover 9 is connected with body 13 in the tail pipe shut-off plug; Interior cover 9 comes downwards to tail pipe and closes in the plug guide head 26; Interior cover 9 upper surfaces move under the block 7, and block 7 is shrinking in the cylindrical shell of body 13 under the effect of mud equal pressure, and this moment, tail pipe was closed plug 30 with adapter sleeve 20 disengagings and with the cement paste in the drilling rod plug 101 descending replacement tail pipes.When with drilling rod plug 101 compound tail pipes close plug 30 and two-stage cementing tool 41 to close obturating plug compound, build the pressure and cut off the shear pin of closing of closing obturating plug and closing cover, thereby close circulation port, accomplish whole the well cementation.
The present invention provides rubber plug system, changes the blind hole type well cementation mode that adopts at present, and float collar substitutes the well cementation mode that two-stage cementing tool is closed, thus the generation that the two-stage cementing tool of avoiding fluid power to impact causing is opened phenomenon in advance.Wherein the effect of the bottom plug of plug assembly is to catch pitching, and build-up pressure is implemented the hanger seat and hung, and continues to build the pressure; Cut off pin and carry pitching safely through cover in the two-stage cementing tool; Arrive the seat that builds the pressure smoothly and put, build-up pressure is so that implement the operation of opening of seat envelope and two-stage cementing tool; Simultaneously, also can be used as the replacement plug of first order cement; Tail pipe is closed plug except that being used for fixing bottom plug, replacing the cement paste in the tail pipe, also is used for forever closing the two-stage cementing tool circulation port.
Claims (9)
1. a rubber plug system that is used for the horizontal well drilling liner cementing comprises the plug assembly and the seat [103] that builds the pressure, and the plug assembly is connected the lower end of tail pipe running tool central tube [46], and the seat [103] that builds the pressure is positioned at the casing coupling [104] above the screen casing [44]; It is characterized in that wherein said plug assembly comprises with same axis, the tail pipe that is linked in sequence is from the top down together closed plug [30] and bottom plug [40], plug [30] closed by said tail pipe and bottom plug [40] is cylinder mode; Wherein tail pipe connects with tail pipe running tool central tube [46] lower ends on closing plug [30], and tail pipe is closed the minimum diameter of plug [30] cylinder inboard wall greater than pitching [27] diameter; Bottom plug [40] upper end is closed plug [30] lower end with tail pipe and is connected through pin [25]; Be provided with the device of blocking [24] in the bottom plug endoporus; In bottom plug [40] the endoporus aperture gradual change of the device of blocking [24] lower end to less than pitching [27] diameter; Can be in the endoporus of bottom plug [40] lower end with pitching [27] retaining, bottom plug [40] lower end outer wall is provided with sealing ring [35] and snap ring [36];
Tail pipe in the wherein said plug assembly is closed plug [30] and is connected with tail pipe running tool central tube [46] with adapter sleeve [20] through joint [10]; Joint [10] and adapter sleeve [20] are cylinder mode, and the inwall minimum diameter of joint [10] and adapter sleeve [20] is all greater than pitching [27] diameter; Joint [10] cylindrical shell upper end is inserted in the lower end of said tail pipe running tool central tube [46], and to be threaded; Be inserted on adapter sleeve [20] cylindrical shell and to be threaded joint [10] cylindrical shell lower end; The inwall of adapter sleeve [20] cylindrical shell lower end is provided with ramp type shoulder [8]; Close the same cross-section location in plug [30] barrel upper end at said tail pipe and be provided with some through holes; Embed block [7] in the through hole; Tail pipe is closed plug [30] and is stuck on the ramp type shoulder [8] of above-mentioned adapter sleeve [20] cylindrical shell lower end inwall through block [7], thereby is connected with tail pipe running tool central tube [46];
The wherein said seat [103] that builds the pressure is a cylindrical structure, and its inwall middle part is provided with a little conical surface [38], the lower end of the little conical surface [38], and inner hole wall is provided with a groove [39]; Bottom plug in the plug assembly [40] moves position so far; Snap ring [36] on bottom plug [40] outer wall will stick in the groove [39] of seat [103] inwall that builds the pressure; Bottom plug sealing ring [35] on bottom plug [40] outer wall will be fitted with the little conical surface [38] of seat [103] inwall that builds the pressure and sealed, thus bottom plug [40] and seat [103] locking and the sealing of building the pressure.
2. rubber plug system according to claim 1 is characterised in that wherein said tail pipe closes plug and include body [13], interior cover [9] and tail pipe and close plug guide head [26], and the three is cylinder mode; The cylindrical shell lower end of body [13] is inserted in tail pipe and is closed plug guide head [26] upper end, between through being threaded; Be with interior cover [9] in body [13] endoporus, interior cover [9] outer wall is that clearance-type cooperates with body [13] inwall, and its part that is nested is provided with sealing; Body [13] links together through shear pin [12] with the cylindrical shell top of interior cover [9]; Tail pipe is closed the interior cover of plug [9] lower surface and is positioned at the top that tail pipe is closed rubber plug body [13] lower surface, and is inverted cone surface; The upper end of said body [13] cylindrical shell is in the part that is nested with interior cover [9]; Be provided with some through holes in same cross-section location on its barrel; Embed block [7] in the through hole, body [13] is stuck on the ramp type shoulder [8] of said adapter sleeve [20] cylindrical shell lower end inwall through block [7]; The inwall of said joint [10] cylindrical shell lower end is provided with upper shoulder [6], and external diameter is identical on joint [10] cylinder internal diameter below the upper shoulder [6] and the cover [9] in tail pipe is closed plug; Closing rubber plug body [13] when tail pipe is stuck on the ramp type shoulder [8] of adapter sleeve [20] inwall lower end; When joint [10] lower end screws in adapter sleeve [20] inwall; Tail pipe is closed and is inserted in joint cylindrical shell [10] lower end in the plug on the cover [9]; Joint [10] lower end inwall upper shoulder [6] withstands on the upper surface of interior cover [9], and outer wall cooperated with joint [10] cylindrical shell lower end inwall formation clearance-type on tail pipe was closed and overlapped [9] in the plug, and was provided with sealing; The bottom of interior cover [9] cylinder inboard wall is provided with an inverted cone surface; Interior cover [9] inwall under the inverted cone surface with will be descending so far drilling rod plug guide head [1] outer wall form clearance-type and cooperate; Under drilling rod plug [101], be advanced into tail pipe and close plug [30]; After drilling rod plug guide head [1] passed interior cover [9] lower surface, the jump ring [3] on the guide head [1] flicked, and is stuck on the lower surface of interior cover [9]; Prevent that drilling rod plug [101] from falling back, the drilling rod plug guide head sealing ring [2] on interior simultaneously cover [9] lower end inwall and drilling rod plug guide head [1] outer wall forms sealing.
3. rubber plug system according to claim 2, wherein said tail pipe are closed rubber plug body [13] outer wall and are with one or more tail pipes and close plug glue bowl [14], glue bowl the rim of a bowl upwards, the rim of a bowl outside dimension is greater than the tail pipe internal diameter.
4. the lower end outer wall that rubber plug system according to claim 2, wherein said tail pipe are closed plug guide head [26] cylindrical shell is the inverted cone surface structure.
5. the outer wall that rubber plug system according to claim 2, wherein said tail pipe are closed plug guide head [26] is provided with ring-type dish cushion rubber [21], and the dish mouth makes progress, and outside dimension is greater than overlapping internal diameter in the two-stage cementing tool.
6. rubber plug system according to claim 2, the bottom plug [40] in the wherein said plug assembly comprises overcoat [23], axle [32] and bottom plug guide head [37], the three is cylinder mode; The cylindrical shell upper end of said overcoat [23] is enclosed within tail pipe and closes in plug guide head [26] endoporus, connects through pin [25], and it is that clearance-type cooperates that the cylindrical shell upper end outer wall of overcoat [23] is closed plug guide head [26] endoporus inwall with tail pipe, and its part that is nested is provided with sealing; The lower end that overcoat [23] cylindrical shell is inserted in the upper end of said axle [32] cylindrical shell, and to be threaded, the part that is nested of overcoat [23] cylindrical shell lower end and axle [32] cylindrical shell upper end is provided with sealing; The top, upper surface of overcoat [23] inwall middle part, axle [32] is provided with the device of blocking [24]; The upper end inwall of axle [32] cylindrical shell is an inverted cone surface; Conical surface upper-end inner diameter is greater than pitching [27] external diameter, and conical surface bottom diameter can be with pitching [27] retaining herein less than pitching [27] external diameter; The lower end of axle [32] cylindrical shell is inserted in the upper end of bottom plug guide head [37] and to be threaded, its part that is nested is provided with sealing; Bottom plug guide head [37] outer wall is provided with bottom plug guide head sealing ring [35], and its below is provided with snap ring [36].
7. rubber plug system according to claim 6 is with one or more bottom plug glue bowls [31] on the outer wall of wherein said bottom plug axle [32], glue bowl the rim of a bowl makes progress, and the rim of a bowl outside dimension is greater than the tail pipe internal diameter.
8. rubber plug system according to claim 6, the lower end outer wall of wherein said bottom plug guide head [37] cylindrical shell is the inverted cone surface structure.
9. rubber plug system according to claim 6, the wherein said seat [103] that builds the pressure is a cylindrical structure, its inwall upper end is a big conical surface, cooperates said bottom plug guide head [37] to insert the seat [103] that builds the pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100560506A CN101482001B (en) | 2008-01-11 | 2008-01-11 | Rubber plug system used for drilling liner cementing of horizontal well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100560506A CN101482001B (en) | 2008-01-11 | 2008-01-11 | Rubber plug system used for drilling liner cementing of horizontal well |
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| Publication Number | Publication Date |
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| CN101482001A CN101482001A (en) | 2009-07-15 |
| CN101482001B true CN101482001B (en) | 2012-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008100560506A Active CN101482001B (en) | 2008-01-11 | 2008-01-11 | Rubber plug system used for drilling liner cementing of horizontal well |
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| CN (1) | CN101482001B (en) |
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| CN101787875B (en) * | 2009-12-29 | 2014-01-01 | 中国石油天然气集团公司 | Quantitative injection method of multi-level injection liquid |
| CN102536160A (en) * | 2010-12-24 | 2012-07-04 | 中国石油化工股份有限公司 | Ball seat type rubber plug system for liner cementing |
| CN102108846B (en) * | 2011-02-10 | 2013-04-03 | 曹凤英 | Followed vibration well cementation method |
| CN102251755A (en) * | 2011-06-18 | 2011-11-23 | 中国石油集团西部钻探工程有限公司 | Vibration exciting rubber stopper |
| CN102628347A (en) * | 2012-03-26 | 2012-08-08 | 中国石油集团长城钻探工程有限公司 | Compound collision pressure device of tail pipe well cementation rubber plug |
| CN103670328B (en) * | 2012-09-18 | 2016-12-21 | 大港油田集团有限责任公司 | Twin-stage is combined cementing plug |
| CN103573212B (en) * | 2013-10-28 | 2016-04-06 | 中国石油集团西部钻探工程有限公司 | Composite bushing well cementation split plug device |
| CN104110234B (en) * | 2014-07-31 | 2017-06-30 | 于世江 | Horizontal cementing exempts to bore blind plate circulation cementing method |
| CN104358542A (en) * | 2014-11-10 | 2015-02-18 | 中国石油天然气集团公司 | Compound rubber plug for well cementation |
| CN104358539B (en) * | 2014-11-18 | 2017-01-18 | 盐城市森鑫石油机械有限公司 | Small sleeve drilling liner cementing device for reforming old well and abandoned well in old oil region of oil field |
| CN105756615B (en) * | 2014-12-16 | 2018-05-29 | 中国石油化工股份有限公司 | Rubber plug component set composite |
| CN106468154B (en) * | 2015-08-21 | 2019-03-05 | 中国石油化工股份有限公司 | Cementing plug for sub-sea drilled wells |
| CN107013183B (en) * | 2017-05-31 | 2023-03-24 | 中国石油天然气集团有限公司 | Tail pipe rubber plug device |
| CN107227943B (en) * | 2017-07-21 | 2023-07-28 | 中国石油天然气集团有限公司 | Tieback insertion cementing assembly |
| CN107642344A (en) * | 2017-10-30 | 2018-01-30 | 华鼎鸿基石油工程技术(北京)有限公司 | Buckling type tail pipe hanger |
| CN110725659B (en) * | 2017-11-02 | 2021-11-23 | 江苏华淼电子科技有限公司 | Water conservancy construction drilling blocking rod and preparation method thereof |
| CN110878679B (en) * | 2018-09-06 | 2021-02-26 | 中国石油化工股份有限公司 | Tail pipe string |
| CN114059947B (en) * | 2020-08-03 | 2023-06-30 | 中国石油天然气股份有限公司 | Fixed-point back-off device for sleeve |
| CN114109302A (en) * | 2021-11-24 | 2022-03-01 | 中石化石油工程技术服务有限公司 | Permeable composite rubber plug for well cementation and use method |
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| CN101482001A (en) | 2009-07-15 |
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