CN103422846A - Open hole horizontal well completion fracturing integrated pipe column - Google Patents
Open hole horizontal well completion fracturing integrated pipe column Download PDFInfo
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- CN103422846A CN103422846A CN2013103060565A CN201310306056A CN103422846A CN 103422846 A CN103422846 A CN 103422846A CN 2013103060565 A CN2013103060565 A CN 2013103060565A CN 201310306056 A CN201310306056 A CN 201310306056A CN 103422846 A CN103422846 A CN 103422846A
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Abstract
The utility model provides an open hole horizontal well completion fracturing integration tubular column, includes butt joint oil pipe, liner hanger, a plurality of fracturing structures, packer, pressure differential sliding sleeve and the float shoe that is connected. Wherein: fracturing structure comprises meeting water packer and undergauge sliding sleeve that is connected, and the undergauge sliding sleeve includes: the upper joint, the outer sleeve and the lower joint are connected; a reducing mechanism and a positioning mechanism are arranged in the outer sleeve in a penetrating manner, the reducing mechanism is provided with an upper sliding sleeve and a lower sliding sleeve which are connected, a push rod is arranged in the upper sliding sleeve in a penetrating manner, and a telescopic ball seat is arranged between the push rod and the lower sliding sleeve; the positioning mechanism is provided with a connecting cylinder, a sliding cylinder and a base are arranged in the connecting cylinder in a penetrating mode, a positioning rod and a piston are clamped between the base and the connecting cylinder, and the upper end of the sliding cylinder is clamped in a clamping groove of the positioning rod. According to the open hole horizontal well completion and fracturing integrated tubular column, the reducing sliding sleeves can be provided with a plurality of reducing sliding sleeves, the reducing sliding sleeves of a plurality of intervals can be opened through the balls with the same diameter, so that the requirement of improving a plurality of oil layers of a horizontal well section is met, and the tubular column is simple in structure and convenient to install and construct.
Description
Technical field
The present invention is relevant for the fracturing integrated tubing string of a kind of oilfield well completion, especially relevant for a kind of fracturing integrated tubing string of open-hole horizontal well completion that the oil field open-hole horizontal well is carried out to the completion pressure break.
Background technology
At present, the oil field open-hole horizontal well mainly adopts " open hole packer+pitching sliding sleeve " step by step fracturing string to carry out completion and pressure break.For example, Chinese patent provides horizontal well completion fracturing integrated pipe column for No. 200920248979.9, it mainly is comprised of safety valve, hydraulic anchor, insertion sealed device, tail tube hanging sealer, tail pipe, expanding open hole packer, pitching sliding sleeve, pressure sliding sleeve, float shoe sliding sleeve, the activities of its completion pressure break is as follows: at first, connect fracturing integrated tubing string by well drilling pipe column after boring completion, fracturing integrated tubing string is sent in horizontal bare hole well section, the extension hanger on fracturing integrated tubing string top is hung in the well cementing casing pipe of top; Secondly, top rod is hung to sealing place dropout by tail pipe and take out, the pipe tubing string of again changing oil inserts tail pipe and hangs, and guarantees this place's good seal; Finally, drop into the ball sealer of ascending different-diameter by well head, complete unlatching and pressure break to each layer of pitching sliding sleeve.
But above-mentioned horizontal well completion fracturing integrated pipe column also exists following a few point defect to have much room for improvement:
1, the open hole packer of this horizontal well completion fracturing integrated pipe column adopts the mechanical compression type packer mostly, and it sets principle is that the interior hydraulic drive packer piston of tube post is realized setting of oil jacket annular space, and its mechanical part is more, easily the sand card; And, the restriction of the rubber material adopted due to this open hole packer, it is not suitable for irregular barefoot interval is sealed.
2, the size of pitching sliding sleeve is subject to the restriction of pitching size, and for meeting the pitching sliding sleeve at diverse location place in the open water horizontal well, the pitching size need increase step by step.When a plurality of oil reservoirs to net horizontal section are transformed pressure break, a plurality of pitching sliding sleeves of installing on horizontal well completion fracturing integrated pipe column, its size will increase step by step along with increasing of oil reservoir quantity, but, the size of pitching sliding sleeve can not infinitely increase, can cause like this size of fractured horizontal well tubing string to increase, not only can increase the production operation cost, and operating risk is also higher, therefore, the pitching sliding sleeve adopted on the fractured horizontal well tubing string of prior art can't meet the requirement of multiple zone being transformed to pressure break, it can not meet the needs of current oil gas field development.
Therefore, be necessary to provide a kind of new horizontal well completion fracturing integrated tubing string, overcome above-mentioned defect.
Summary of the invention
The purpose of this invention is to provide the fracturing integrated tubing string of a kind of open-hole horizontal well completion, undergauge sliding sleeve on it can be provided with a plurality of, by diameter, identical ball can be opened the undergauge sliding sleeve of a plurality of intervals, to meet the requirement that the net horizontal section multiple zone is transformed, the fracturing integrated tubular column structure of this open-hole horizontal well completion is simple, installs and easy construction.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
The invention provides the fracturing integrated tubing string of a kind of open-hole horizontal well completion, the fracturing integrated tubing string of described open-hole horizontal well completion comprises:
The docking oil pipe, it is located in the sleeve pipe of Vertical Well section of horizontal well;
Extension hanger, it is connected with described docking oil pipe, and described extension hanger hangs on described sleeve pipe;
A plurality of pressure break structures, it is connected on described extension hanger and is positioned at the net horizontal section of described horizontal well, and each described pressure break structure series connection is connected, and it comprises chance water packer and the undergauge sliding sleeve be connected; Wherein, described undergauge sliding sleeve comprises:
Top connection, its upper end is connected with described chance water packer, and its lower end is connected with overcoat, and the lower end of described overcoat is connected with lower contact, and the upper end of described overcoat offers the pressure break hole;
Undergauge mechanism, it has and wears the upper sliding sleeve be connected in described overcoat, the upper end of described upper sliding sleeve offers flowing hole, its lower end is connected with low sleeve, wear and be connected with push rod in described upper sliding sleeve, between described push rod and described low sleeve, be folded with flexible ball seat, the lower end of described upper sliding sleeve offers inlet opening, be formed with admission chamber between described push rod and described upper sliding sleeve, described inlet opening is connected with described admission chamber;
Detent mechanism, it is positioned at the below of described undergauge mechanism, described detent mechanism has the connecting cylinder be located in described overcoat, be equipped with sliding cylinder and pedestal in described connecting cylinder, described sliding cylinder can axially movably be located in the upper end of described pedestal, the lower end of described pedestal is connected with described lower contact, be folded with backstay and piston between described pedestal and described connecting cylinder, the inboard, upper end of described backstay is axially arranged with a plurality of draw-in grooves, the upper end of described sliding cylinder is fastened in described draw-in groove, and described piston is connected on described connecting cylinder;
Wherein, described connecting cylinder with offer respectively the relative fluid hole of level and inlet opening on described pedestal, described piston is provided with radial direction through hole, in the upper end of described sliding cylinder, be fastened under the state of the described draw-in groove that is positioned at top in a plurality of described draw-in grooves, the inlet opening of described fluid hole, described radial direction through hole and described pedestal is connected;
The pressure reduction sliding sleeve, the one end is connected with described a plurality of pressure break structures by packer, and its other end is connected with float shoe.
In a preferred embodiment, the upper end of the connecting cylinder of described undergauge sliding sleeve is connected with spool, and described low sleeve is set in the upper end of described spool slidably, and the lower end of described spool is located in described sliding cylinder.
In a preferred embodiment, described upper sliding sleeve is connected to described outer putting by shear pin, the lower end of described low sleeve radially inwardly convexes with location division, at described shear pin, cut off, and the upper end contact of described spool is under the state of described location division, and described pressure break hole is connected with described flowing hole.
In a preferred embodiment, described connecting cylinder comprises the first connecting cylinder and the second connecting cylinder, and described the first connecting cylinder is connected to the upper end of described the second connecting cylinder, and described piston is connected on described the second connecting cylinder by shear pin.
In a preferred embodiment, the upper end of described lower contact is connected with excessive head, and described excessive head is located in described overcoat, and the lower end of described pedestal, the lower end of described connecting cylinder are connected on described excessive head.
In a preferred embodiment, be folded with spring between described sliding cylinder and described pedestal.
In a preferred embodiment, the upper end of described sliding cylinder radially outward convexes with snap fit, and described snap fit is fastened in described draw-in groove, and the lower end of described sliding cylinder radially inwardly convexes with sits the ball pawl.
In a preferred embodiment, described push rod is connected on described upper sliding sleeve by shear pin, be formed with container cavity between described upper sliding sleeve and described overcoat, be formed with annular chamber between described connecting cylinder and described overcoat, described container cavity is connected with described annular chamber, at the inlet opening of described fluid hole, described radial direction through hole, described pedestal, described annular chamber and described container cavity, be connected, and, under the state that described shear pin is cut off, the described flexible ball seat of described push rod pushing and pressing radially moves inwardly into the seat ball position.
In a preferred embodiment, the inside wall of described connecting cylinder is provided with latch, and the outside, lower end of described backstay is connected with the lock ring latch, and described lock ring latch matches with described latch.
In a preferred embodiment, the fracturing integrated tubing string of described open-hole horizontal well completion comprises three described pressure break structures, the backstay of the undergauge sliding sleeve of each described pressure break structure is provided with four described draw-in grooves, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described horizontal well well head place is fastened in four draw-in grooves of described backstay and is positioned at draw-in groove bottom, the upper end of the sliding cylinder of the undergauge sliding sleeve of the described pressure break structure in the middle of being arranged in three described pressure break structures is fastened on four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove top bottom, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described pressure reduction sliding sleeve place is fastened in four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove below topmost.
In a preferred embodiment, between described extension hanger and described a plurality of pressure break structure, also be connected with packer, described packer is for meeting water packer.
Characteristics and the advantage of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention are:
One, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, adopt the undergauge sliding sleeve to carry out fracturing work to each oil reservoir of down-hole, when a plurality of oil reservoirs in down-hole are carried out to fracturing work, a plurality of undergauge sliding sleeves that are connected in series, by from well head, dropping into the identical ball of diameter, just can open in turn the undergauge sliding sleeve of a plurality of oil layer sections, the unlatching of this undergauge sliding sleeve is not subject to the restriction of pitching diameter, it not only can increase the transformation progression of oil reservoir, and guaranteed the large latus rectum of tubing string, reduce operating risk, facilitated the operation that is lowered to of later stage instrument.The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, simple in structure, it is convenient to install with constructing operation, and it has shortened completion and pressure break time greatly, has reduced operating risk, has guaranteed the large latus rectum of tubing string, facilitates the operation that is lowered to of later stage instrument.
Two, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, adopt and meet water packer packing oil jacket annular space, with existing bore hole compression packer, compares, and has the safety of setting, and adapts to the characteristics of irregular borehole.
Three, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, be connected to the chance water packer of extension hanger lower end, can effectively stop the impact of inclination section water layer on the horizontal segment oil reservoir.
The accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation that Fig. 1 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
The half sectional view that the undergauge sliding sleeve that Fig. 2 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention is not opened.
The half sectional view of the undergauge sliding sleeve state one that Fig. 3 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
The half sectional view of the undergauge sliding sleeve state two that Fig. 4 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
The half sectional view of the undergauge sliding sleeve state three that Fig. 5 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
Half sectional view after the undergauge sliding sleeve that Fig. 6 is the fracturing integrated tubing string of open-hole horizontal well completion of the present invention is opened.
The specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
As shown in Figure 1, 2, the invention provides the fracturing integrated tubing string of a kind of open-hole horizontal well completion, it comprises docking oil pipe 1, extension hanger 2, a plurality of pressure break structure 3 and pressure reduction sliding sleeve 4.Wherein: docking oil pipe 1 is located in the sleeve pipe 5 of Vertical Well section 91 of horizontal well; Extension hanger 2 is connected with described docking oil pipe 1, and described extension hanger 2 hangs on described sleeve pipe 5; A plurality of pressure break structures 3 are connected on described extension hanger 2 and are positioned at the net horizontal section 92 of described horizontal well, and each described pressure break structure 3 series connection is connected, and it comprises chance water packer 6 and the undergauge sliding sleeve 7 be connected; One end of pressure reduction sliding sleeve 4 is connected with described a plurality of pressure break structures 3 by packer, and its other end is connected with float shoe 8.
Wherein, described undergauge sliding sleeve 7 comprises top connection 71, undergauge mechanism 72 and detent mechanism 73.The upper end of top connection 71 is connected with described chance water packer 6, and its lower end is connected with overcoat 74, and the lower end of described overcoat 74 is connected with lower contact 75, and the upper end of described overcoat 74 offers pressure break hole 741, undergauge mechanism 72 has and wears the upper sliding sleeve 721 be connected in described overcoat 74, the upper end of described upper sliding sleeve 721 offers flowing hole 7211, its lower end is connected with low sleeve 722, wear and be connected with push rod 723 in described upper sliding sleeve 721, be folded with flexible ball seat 724 between described push rod 723 and described low sleeve 722, the lower end of described upper sliding sleeve 721 offers inlet opening 7212, be formed with admission chamber 7213 between described push rod 723 and described upper sliding sleeve 721, described inlet opening 7212 is connected with described admission chamber 7213, detent mechanism 73 is positioned at the below of described undergauge mechanism 72, described detent mechanism 73 has the connecting cylinder 731 be located in described overcoat 74, be equipped with sliding cylinder 732 and pedestal 733 in described connecting cylinder 731, described sliding cylinder 732 can axially movably be located in the upper end of described pedestal 733, the lower end of described pedestal 733 is connected with described lower contact 75, be folded with backstay 734 and piston 735 between described pedestal 733 and described connecting cylinder 731, the upper end inner shafts of described backstay 734 is to offering a plurality of draw-in grooves 7341, the upper end of described sliding cylinder 732 is fastened in described draw-in groove 7341, described piston 735 is connected on described connecting cylinder 731, wherein, described connecting cylinder 731 offers respectively level relative fluid hole 7311 and inlet opening 7331 with on described pedestal 733, offer radial direction through hole 7351 on described piston 735, in the upper end of described sliding cylinder 732, be fastened under the state of the described draw-in groove 7341 ' that is positioned at top in a plurality of described draw-in grooves 7341, the inlet opening 7331 of described fluid hole 7311, described radial direction through hole 7351 and described pedestal 733 is connected.
Specifically, the Vertical Well section 91 of horizontal well is by sleeve pipe 5 well cementing of cement, and this sleeve pipe 5 comprises surface pipe 51 and protective casing 52, and surface pipe 51 is connected to the upper end of protective casing 52.Docking oil pipe 1 is located in surface pipe 51 and protective casing 52, and its lower end is connected with extension hanger 2, and this extension hanger 2 is suspended on protective casing 52.
A plurality of pressure break structures 3 are connected in series on extension hanger 2 successively, it is positioned at the net horizontal section 92 of horizontal well, each pressure break structure 3 is by meeting water packer 6 and undergauge sliding sleeve 7 compositions, chance water packer 6 is connected to the upstream extremity of undergauge sliding sleeve 7, the downstream of a plurality of pressure break structures 3 is connected with float shoe 8 with pressure reduction sliding sleeve 4 by packer, in the present invention, the packer be connected between a plurality of pressure break structures 3 and pressure reduction sliding sleeve 4 can be chance water packer 6.
Wherein, the chance water packer 6 of above-mentioned pressure break structure 3 is chance water packer well known in the prior art, and its concrete structure does not repeat them here.This meets water packer 6 for packing oil jacket annular space, it is met water and just can self-expanding set, and without suppressing, sets, and sets safe and reliable, this chance water packer 6 can effectively solve the sand card problem of mechanical packer, and is applicable to irregular barefoot interval is sealed.
Refer to shown in Fig. 2, the undergauge sliding sleeve 7 of above-mentioned pressure break structure 3 is relative with the oil reservoir of the net horizontal section 92 of horizontal well, by from the well head pitching, opens undergauge sliding sleeve 7, so that net horizontal section 92 each oil reservoirs are carried out to fracturing work.This undergauge sliding sleeve 7 has connected successively top connection 71, overcoat 74 and lower contact 75, the upper end of top connection 71 is connected with chance water packer 6, the upper end of overcoat 74 is threaded in the inboard, lower end of top connection 71, the lower end of overcoat 74 is threaded in the outside, upper end of lower contact 75, thereby top connection 71, overcoat 74 and lower contact 75 are combined into a body that substantially is cylindrical tube shape, and this body has can reach the centre bore 76 that pitching is passed through for liquid.Wherein, on the sidewall of the upper end of overcoat 74, offer pressure break hole 741, the fracturing fluid that horizontal well net horizontal section 92 each oil reservoirs is carried out to fracturing work is under these pressure break hole 741 Injection Wells in each oil reservoir.
The undergauge mechanism 72 of undergauge sliding sleeve 7 is located in the overcoat 74 of undergauge sliding sleeve 7, in the present invention, the upper sliding sleeve 721 of this undergauge mechanism 72 is connected to the inboard, upper end of overcoat 74 by shear pin 7214 and blocks the pressure break hole 741 of overcoat 74, the upper end of this upper sliding sleeve 721 is sticked on the inside wall of overcoat 74, the upper end of upper sliding sleeve 721 offers flowing hole 7211, be formed with container cavity 7215 between the inside wall of its lower end and overcoat 74, the inlet opening 7212 that upper sliding sleeve 721 lower ends are offered is connected with container cavity 7215; Push rod 723 is connected to the inboard, lower end of upper sliding sleeve 721 by shear pin 7231, the admission chamber 7213 formed between the lower end of push rod 723 and upper sliding sleeve 721 is connected with container cavity 7215 by the inlet opening 7212 that is opened in upper sliding sleeve 721 lower ends; Low sleeve 722 is threaded in the inboard, lower end of upper sliding sleeve 721, is folded with flexible ball seat 724 between the upper end of low sleeve 722 and push rod 723.In the present invention, this flexible ball seat 724 is c-shaped ring-type substantially, and when the flexible ball seat 724 of push rod 723 axial downward movement extruding, external diameter and the internal diameter of flexible ball seat 724 all radially inwardly dwindle, and flexible ball seat 724 will enter setting position.
The detent mechanism 73 of undergauge sliding sleeve 7 is located in the overcoat 74 of undergauge sliding sleeve 7, and it is positioned at the below of undergauge mechanism 72.In the present invention, the connecting cylinder 731 of this detent mechanism 73 is comprised of the first connecting cylinder 7312 and the second connecting cylinder 7313, the first connecting cylinder 7312 is threaded in the upper end of the second connecting cylinder 7313, the fluid hole 7311 of connecting cylinder 731 is opened in the lower end of the second connecting cylinder 7313, be formed with annular chamber 7314 between this connecting cylinder 731 and overcoat 74, the container cavity 7215 formed between annular chamber 7314 and upper sliding sleeve 721 and overcoat 74 is connected.In the present embodiment, the upper end of the connecting cylinder 731 of undergauge sliding sleeve 7, be also the upper end of the first connecting cylinder 7312, is connected with spool 736, the low sleeve 722 of undergauge mechanism 72 sealing shroud slidably is located at outside the upper end of spool 736, and the sealing of the lower end of spool 736 is located in sliding cylinder 732.
The sliding cylinder 732 of detent mechanism 73 and pedestal 733 are located in connecting cylinder 731, sliding cylinder 732 can seal the inboard, upper end that is located in pedestal 733 axially slidably, in the present embodiment, be folded with spring 737 between sliding cylinder 732 and pedestal 733, by the resilient force of spring 737, sliding cylinder 732 is moved relative to pedestal 733 axial reciprocatings.In the present invention, the upper end of sliding cylinder 732 radially outward convexes with snap fit 7321, and its lower end radially inwardly convexes with sits ball pawl 7322.
In one embodiment of this invention, lower contact 75 upper ends of undergauge sliding sleeve 7 have been threaded excessive 738, be located in for excessive 738 in overcoat 74, the lower end of the second connecting cylinder 7313 of the lower end of pedestal 733 and connecting cylinder 731 is threaded in respectively the outside, upper end of excessive 738, thereby form a container cavity 739 between connecting cylinder 731, sliding cylinder 732, pedestal 733 and excessive 738, backstay 734 and piston 735 are arranged in this container cavity 739.Wherein, backstay 734 is folded between the first connecting cylinder 7312 of sliding cylinder 732 and connecting cylinder 731, and the snap fit 7321 of sliding cylinder 732 upper ends is fastened in one of them draw-in groove 7341 in a plurality of axial draw-in groove 7341 of offering backstay 734 inboards, upper end; Piston 735 is folded between the second connecting cylinder 7313 of pedestal 733 and connecting cylinder 731, piston 735 is sealedly connected on the inside wall of the second connecting cylinder 7313 by shear pin 7352, and contact with the lateral wall sealing of pedestal 733, piston 735 blocks respectively the inlet opening 7331 of pedestal 733 and the fluid hole 7311 of the second connecting cylinder 7313, now, the radial direction through hole 7351 of offering on piston 735 is not connected with inlet opening 7331 and fluid hole 7311.
When needs unlatching undergauge sliding sleeve 7 carries out fracturing work, at first, as shown in Figure 2 undergauge sliding sleeve 7 is assembled, make the upper end snap fit 7321 of the sliding cylinder 732 of undergauge sliding sleeve 7 be fastened on that backstay 734 inboards, upper end offer except in any draw-in groove 7341 of top draw-in groove 7341 ', now, undergauge sliding sleeve 7 is in opening not; Then, by oil reservoir position under undergauge sliding sleeve 7 lower going-into-wells, from the well head pitching, liquid in tubing string is also sat spherical zone to be located on the seat ball pawl 7322 of sliding cylinder 732 in the centre bore 76 of undergauge sliding sleeve 7, now, owing to sitting ball pawl 7322 near pedestal 733 inwall settings, can't strut by the restriction seat ball pawl 7322 of pedestal 733 inwalls; When the liquid displacement in the centre bore 76 of undergauge sliding sleeve 7 increases, shown in figure 3, the effect of ball 10 liquid body pressure will axially move down, ball 10 drives together axial downward movement of sliding cylinder 732, now, spring 737 is subject to compressing of sliding cylinder 732 compressed, sits ball pawl 7322 and shifts out pedestal 733 inwalls softened, and ball 10 drops down; Meanwhile, the snap fit 7321 drive backstays 734 of sliding cylinder 732 upper ends axially move down.Refer to shown in Fig. 4, when first ball 10 from sliding cylinder 732 through and drop after, under the elastic-restoring force effect of compression spring 737, sliding cylinder 732 is returned back to original position by ejection again, now, the seat ball pawl 7322 of sliding cylinder 732 comes back to original position, and the snap fit 7321 of sliding cylinder 732 upper ends will be from the initial interior groove 7341 that is positioned at groove 7341 tops that initial card establishes that axially is moved upward to of the groove 7341 of establishing that blocks, to wait for pitching next time.
As shown in Figure 5, by that analogy, drop into successively the second ball that diameter is identical in undergauge sliding sleeve 7, the 3rd ball etc., make sliding cylinder 732 drive the axial down sliding of backstay 734, until the lower end of backstay 734 contacts with the upper surface of piston 735, now, piston 735 at the pressure-acting lower shaft of backstay 734 to moving down, the shear pin 7352 that connects piston 735 and the second connecting cylinder 7313 is cut off, piston 735 glides, until ball 10 comes off in the seat ball pawl 7322 of sliding cylinder 732, now, the inlet opening 7331 of pedestal 733, the radial direction through hole 7351 of piston 735, the fluid hole 7311 of the second connecting cylinder 7313 is connected.Liquid in undergauge sliding sleeve 7 centre bores 76 is by the inlet opening 7331 of pedestal 733, the radial direction through hole 7351 of piston 735, the fluid hole 7311 of the second connecting cylinder 7313 enters in the annular chamber 7314 between connecting cylinder 731 and overcoat 74, thereby enter in the container cavity 7215 of upper sliding sleeve 721 and overcoat 74 formation, and enter in admission chamber 7213 through the inlet opening 7212 of upper sliding sleeve 721, push rod 723 is axial down sliding under the effect of hydraulic pressure, cut off the shear pin 7231 between push rod 723 and upper sliding sleeve 721, in admission chamber 7213 under the continuous effect of hydraulic pressure, the flexible ball seat 724 of push rod 723 pushing and pressing radially moves inward, the external diameter of flexible ball seat 724 and internal diameter dwindle and enter the state of setting.
As shown in Figure 6, again from well head pitching 10 ', ball 10 ' falls in flexible ball seat 724 and sets, now, strengthen the hydraulic pressure in centre bore 76, when the hydraulic pressure in centre bore 76 reaches certain numerical value, by the shear pin 7214 of cutting off between overcoat 74 and upper sliding sleeve 721, upper sliding sleeve 721 is axial down sliding under the effect of hydraulic pressure, in the present invention, the lower end of low sleeve 722 radially inwardly convexes with location division 7221, when shear pin 7214 is cut off, and the upper end contact of spool 736 is on location division 7221 time, the pressure break hole 741 of overcoat 74 is connected just with the flowing hole 7211 of upper sliding sleeve 721, now, undergauge sliding sleeve 7 is opened, by in the centre bore 76 to undergauge sliding sleeve 7, adding sand, carry out fracturing work to treat the pressure break oil reservoir.
Undergauge sliding sleeve 7 of the present invention, when a plurality of oil reservoirs in down-hole are carried out to fracturing work, be connected a plurality of undergauge sliding sleeve 7 series connection, passes through to meet water packer 6 packings between each undergauge sliding sleeve 7.By from well head, dropping into the identical ball of diameter, just can open in turn the undergauge sliding sleeve 7 of a plurality of oil layer sections, the unlatching of this undergauge sliding sleeve 7 is not subject to the restriction of pitching diameter, it has guaranteed the large latus rectum of fracturing string, and increased the transformation progression of oil reservoir, reduce operating risk, facilitated being lowered to smoothly of later stage instrument.
The pressure reduction sliding sleeve 4 be connected with a plurality of pressure break structures 3 is pressure reduction sliding sleeve well known in the prior art, and its concrete structure does not repeat them here.Pressure reduction sliding sleeve 4 just can open and carry out the fracturing work of downhole oil layer under the effect of water injection pressure.
The round end float shoe 8 that is connected to pressure reduction sliding sleeve 4 one ends is float shoe well known in the prior art, and its concrete structure does not repeat them here.The effect of this round end float shoe 8 is mainly to guarantee that the safety of tubing string is lowered to and annular space carrying out smoothly for mud.
According to one embodiment of the invention, the inside wall of described connecting cylinder 731 is provided with latch 7315, and the outside, lower end of described backstay 734 is connected with lock ring latch 7342, and described lock ring latch 7342 matches with described latch 7315.Specifically, latch 7315 is opened on the inside wall of the second connecting cylinder 7313 of connecting cylinder 731, in the outside, lower end of backstay 734, is provided with groove 7343, and lock ring latch 7342 is arranged in this groove 7343.When backstay 734 axially moves down, lock ring latch 7342 can be stuck on the latch 7315 of the second connecting cylinder 7313, can make like this backstay 734 in the process axially moved down, be locked at step by step on connecting cylinder 731, prevent on backstay 734 axially that the situation of moving occurs.
The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, its Completion Operations is as follows: at first, after boring completion, by surface pipe 51 and protective casing 52 well cementing of cement, then well drilling pipe column and the fracturing integrated tubing string of open-hole horizontal well completion of the present invention are linked together, this tubing string is sent in open-hole horizontal well section 92, the extension hanger 2 on the fracturing integrated tubing string of open-hole horizontal well completion top is hung in protective casing 52; Secondly, well head connects pumping line, and direct circulation is by the casing annulus drilling mud for clean, and then pitching builds the pressure, the extension hanger 2 of giving up; Afterwards, top rod is hung to sealing place dropout by tail pipe and take out, again change docking oil pipe 1 and insert extension hanger 2, and guarantee this place's good seal; After 24 hours, it is complete that chance water packer 6 is met the water automatic settings, packing oil jacket annular space; Now, to pump hydraulic pressure in tubing string, pressure reduction sliding sleeve 4 is opened under the effect of hydraulic pressure, and start to pressure reduction sliding sleeve 4 oil reservoir is carried out to fracturing work; Finally, by drop into the ball 10 of same diameter from well head, open the right undergauge sliding sleeve 7 of each oil reservoir and carry out fracturing work.
The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, it is simple in structure, and it is convenient to install with constructing operation.Simultaneously, this chance water packer 6 is compared with the bore hole compression packer, has the safety of setting, and adapts to the characteristics of irregular borehole.The fracturing integrated tubing string of open-hole horizontal well completion adopts undergauge sliding sleeve 7 to realize each oil reservoir of down-hole is carried out to fracturing work, adopts the identical ball 10 of diameter, opens the undergauge sliding sleeve 7 of a plurality of oil layer sections, increases the progression of oil formation improvement.The fracturing integrated tubing string of this open-hole horizontal well completion has shortened completion and pressure break time greatly, has reduced operating risk, has guaranteed the large latus rectum of tubing string, facilitates the operation that is lowered to of later stage instrument.
In addition, in one embodiment of this invention, the lower end of the extension hanger 2 of the fracturing integrated tubing string of this open-hole horizontal well completion also is connected with a packer, and this packer is for meeting water packer 6, and it can effectively stop the impact of inclination section water layer on net horizontal section 92 each oil reservoirs.
According to an embodiment of the invention, the fracturing integrated tubing string of described open-hole horizontal well completion comprises three described pressure break structures 3, the backstay 734 of the undergauge sliding sleeve 7 of each described pressure break structure 3 is provided with four described draw-in grooves 7341, the upper end of the sliding cylinder 732 of the described undergauge sliding sleeve 7 at close described horizontal well well head place is fastened in 734 4 draw-in grooves 7341 of described backstay and is positioned at draw-in groove 7341 bottom, the upper end of the sliding cylinder 732 of the undergauge sliding sleeve 7 of the described pressure break structure 3 in the middle of being arranged in three described pressure break structures 3 is fastened on 734 4 draw-in grooves 7341 of described backstay and is positioned at the draw-in groove 7341 of draw-in groove 7341 tops bottom, the upper end of the sliding cylinder 732 of the described undergauge sliding sleeve 7 at close described pressure reduction sliding sleeve 4 places is fastened in 734 4 draw-in grooves 7341 of described backstay and is positioned at the draw-in groove of draw-in groove 7341 ' below topmost.
When in the fracturing integrated tubing string of open-hole horizontal well completion, dropping into first ball, at first undergauge sliding sleeve 7 near pressure reduction sliding sleeve 4 is unlocked, the flexible ball seat 724 of this undergauge sliding sleeve 7 radially moves inwardly into setting position, now drop into the second ball, the flowing hole 7211 of the upper sliding sleeve 721 of this undergauge sliding sleeve 7 is connected with pressure break hole 741, thereby carries out fracturing work; Drop into afterwards the 3rd ball, the undergauge sliding sleeve 7 of the pressure break structure 3 due to three pressure break structures 3 in the middle of being positioned at, in the process of front twice pitching, its flexible ball seat 724 is in setting position, the 3rd ball now dropped into, to the flowing hole 7211 of the upper sliding sleeve 721 of this undergauge sliding sleeve 7 be connected with pressure break hole 741, thereby carry out fracturing work; Finally, drop into the 4th ball, undergauge sliding sleeve 7 due to the pressure break structure 3 near the well head place, in the process of first three pitching, its flexible ball seat 724 is in setting position, the 4th ball now dropped into, will make the flowing hole 7211 of the upper sliding sleeve 721 of this undergauge sliding sleeve 7 be connected with pressure break hole 741, thereby carry out fracturing work.
The foregoing is only several embodiments of the present invention, those skilled in the art can carry out various changes or modification and not break away from the spirit and scope of the present invention the embodiment of the present invention according to the disclosed content of application documents.
Claims (11)
1. the fracturing integrated tubing string of open-hole horizontal well completion, is characterized in that, the fracturing integrated tubing string of described open-hole horizontal well completion comprises:
The docking oil pipe, it is located in the sleeve pipe of Vertical Well section of horizontal well;
Extension hanger, it is connected with described docking oil pipe, and described extension hanger hangs on described sleeve pipe;
A plurality of pressure break structures, it is connected on described extension hanger and is positioned at the net horizontal section of described horizontal well, and each described pressure break structure series connection is connected, and it comprises chance water packer and the undergauge sliding sleeve be connected; Wherein, described undergauge sliding sleeve comprises:
Top connection, its upper end is connected with described chance water packer, and its lower end is connected with overcoat, and the lower end of described overcoat is connected with lower contact, and the upper end of described overcoat offers the pressure break hole;
Undergauge mechanism, it has and wears the upper sliding sleeve be connected in described overcoat, the upper end of described upper sliding sleeve offers flowing hole, its lower end is connected with low sleeve, wear and be connected with push rod in described upper sliding sleeve, between described push rod and described low sleeve, be folded with flexible ball seat, the lower end of described upper sliding sleeve offers inlet opening, be formed with admission chamber between described push rod and described upper sliding sleeve, described inlet opening is connected with described admission chamber;
Detent mechanism, it is positioned at the below of described undergauge mechanism, described detent mechanism has the connecting cylinder be located in described overcoat, be equipped with sliding cylinder and pedestal in described connecting cylinder, described sliding cylinder can axially movably be located in the upper end of described pedestal, the lower end of described pedestal is connected with described lower contact, be folded with backstay and piston between described pedestal and described connecting cylinder, the inboard, upper end of described backstay is axially arranged with a plurality of draw-in grooves, the upper end of described sliding cylinder is fastened in described draw-in groove, and described piston is connected on described connecting cylinder;
Wherein, described connecting cylinder with offer respectively the relative fluid hole of level and inlet opening on described pedestal, described piston is provided with radial direction through hole, in the upper end of described sliding cylinder, be fastened under the state of the described draw-in groove that is positioned at top in a plurality of described draw-in grooves, the inlet opening of described fluid hole, described radial direction through hole and described pedestal is connected;
The pressure reduction sliding sleeve, the one end is connected with described a plurality of pressure break structures by packer, and its other end is connected with float shoe.
2. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, the upper end of the connecting cylinder of described undergauge sliding sleeve is connected with spool, and described low sleeve is set in the upper end of described spool slidably, and the lower end of described spool is located in described sliding cylinder.
3. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 2, it is characterized in that, described upper sliding sleeve is connected to described outer putting by shear pin, the lower end of described low sleeve radially inwardly convexes with location division, at described shear pin, cut off, and the upper end contact of described spool is under the state of described location division, and described pressure break hole is connected with described flowing hole.
4. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, described connecting cylinder comprises the first connecting cylinder and the second connecting cylinder, described the first connecting cylinder is connected to the upper end of described the second connecting cylinder, and described piston is connected on described the second connecting cylinder by shear pin.
5. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, the upper end of described lower contact is connected with excessive head, and described excessive head is located in described overcoat, and the lower end of described pedestal, the lower end of described connecting cylinder are connected on described excessive head.
6. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, between described sliding cylinder and described pedestal, is folded with spring.
7. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, the upper end of described sliding cylinder radially outward convexes with snap fit, and described snap fit is fastened in described draw-in groove, and the lower end of described sliding cylinder radially inwardly convexes with sits the ball pawl.
8. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, described push rod is connected on described upper sliding sleeve by shear pin, be formed with container cavity between described upper sliding sleeve and described overcoat, be formed with annular chamber between described connecting cylinder and described overcoat, described container cavity is connected with described annular chamber, at described fluid hole, described radial direction through hole, the inlet opening of described pedestal, described annular chamber and described container cavity are connected, and under the state that described shear pin is cut off, the described flexible ball seat of described push rod pushing and pressing radially moves inwardly into the seat ball position.
9. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, the inside wall of described connecting cylinder is provided with latch, and the outside, lower end of described backstay is connected with the lock ring latch, and described lock ring latch matches with described latch.
10. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, the fracturing integrated tubing string of described open-hole horizontal well completion comprises three described pressure break structures, the backstay of the undergauge sliding sleeve of each described pressure break structure is provided with four described draw-in grooves, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described horizontal well well head place is fastened in four draw-in grooves of described backstay and is positioned at draw-in groove bottom, the upper end of the sliding cylinder of the undergauge sliding sleeve of the described pressure break structure in the middle of being arranged in three described pressure break structures is fastened on four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove top bottom, the upper end of the sliding cylinder of the described undergauge sliding sleeve at close described pressure reduction sliding sleeve place is fastened in four draw-in grooves of described backstay and is positioned at the draw-in groove of draw-in groove below topmost.
11. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, between described extension hanger and described a plurality of pressure break structure, also is connected with packer, described packer is for meeting water packer.
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| CN201310306056.5A CN103422846B (en) | 2013-07-19 | 2013-07-19 | Open hole horizontal well completion fracturing integrated pipe column |
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| CN201310306056.5A CN103422846B (en) | 2013-07-19 | 2013-07-19 | Open hole horizontal well completion fracturing integrated pipe column |
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| CN103422846B CN103422846B (en) | 2015-11-18 |
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| CN104358539A (en) * | 2014-11-18 | 2015-02-18 | 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 |
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| CN109267983A (en) * | 2017-07-17 | 2019-01-25 | 中国石油化工股份有限公司华北油气分公司石油工程技术研究院 | Horizontal well refracturing device and method based on the complete well of the preset tubing string of naked eye |
| CN113530512A (en) * | 2020-04-22 | 2021-10-22 | 中国石油天然气股份有限公司 | Fracturing string and fracturing method |
| CN114856491A (en) * | 2021-02-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Sliding type double-ball pump bottom valve |
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