CN103422846B - 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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- CN103422846B CN103422846B CN201310306056.5A CN201310306056A CN103422846B CN 103422846 B CN103422846 B CN 103422846B CN 201310306056 A CN201310306056 A CN 201310306056A CN 103422846 B CN103422846 B CN 103422846B
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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 has about the fracturing integrated tubing string of a kind of oilfield well completion, especially has about a kind of fracturing integrated tubing string of open-hole horizontal well completion oil field open-hole horizontal well being carried out to completion pressure break.
Background technology
At present, 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.Such as, No. 200920248979.9, Chinese patent provides horizontal well completion fracturing integrated pipe column, it is primarily 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 composition, the activities of its completion pressure break is as follows: first, fracturing integrated tubing string is connected 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 sealing dropout by tail pipe and takes out, again change oil pipe column insertion tail pipe and hang, and ensure this place's good seal; Finally, dropped into the ball sealer of ascending different-diameter by well head, come the unlatching to each layer pitching sliding sleeve and pressure break.
But also there is following a few point defect and have much room for improvement in above-mentioned horizontal well completion fracturing integrated pipe column:
1, the open hole packer of this horizontal well completion fracturing integrated pipe column adopts mechanical compression type packer mostly, and it sets principle is that hydraulic drive packer piston in tube post realizes setting of oil jacket annular space, and its mechanical part is more, easy sand card; Further, due to the restriction of the rubber material that this open hole packer adopts, it is not suitable for sealing irregular barefoot interval.
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 open water horizontal well, pitching size need increase step by step.When carrying out transformation pressure break to multiple oil reservoirs of net horizontal section, multiple pitching sliding sleeves that horizontal well completion fracturing integrated pipe column is installed, its size increases step by step by along with increasing of oil reservoir quantity, but, the size of pitching sliding sleeve can not infinitely increase, the size of fractured horizontal well tubing string can be caused like this to increase, not only can increase production operation cost, and operating risk is also higher, therefore, the pitching sliding sleeve that the fractured horizontal well tubing string of prior art adopts cannot meet the requirement of carrying out transforming pressure break to multiple zone, 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 object 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 multiple, the undergauge sliding sleeve of multiple interval can be opened by the ball that diameter is identical, to meet the requirement of transforming net horizontal section multiple zone, 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:
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;
Multiple pressure break structure, it to be connected on described extension hanger and to be positioned at the net horizontal section of described horizontal well, and each described pressure break structures in series is connected, and it comprises the chance water packer and undergauge sliding sleeve that are 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 pressure break hole;
Undergauge mechanism, it has the upper sliding sleeve wearing and 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 in described upper sliding sleeve and be connected with push rod, be folded with telescoping tee between described push rod and described low sleeve, 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, sliding cylinder and pedestal is equipped with in described connecting cylinder, described sliding cylinder axially movably can be located in the upper end of described pedestal, the lower end of described pedestal is connected with described lower contact, backstay and piston is folded with between described pedestal and described connecting cylinder, multiple draw-in groove is axially arranged with inside the upper end of described backstay, 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 described pedestal offers respectively the relative fluid hole of level and inlet opening, described piston is provided with radial direction through hole, under being fastened in the upper end of described sliding cylinder the state of described draw-in groove being positioned at top in multiple described draw-in groove, described fluid hole, described radial direction through hole are connected with the inlet opening of described pedestal;
Pressure reduction sliding sleeve, its one end is connected with described multiple pressure break structure 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 to put by shear pin, the lower end of described low sleeve is radially-inwardly convexly equipped with location division, cut off at described shear pin, and the upper end contact of described spool is under the state of described location division, 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 first connecting cylinder is connected to the upper end of described second connecting cylinder, and described piston is connected on described second connecting cylinder by shear pin.
In a preferred embodiment, the upper end of described lower contact is connected with transition head, and described transition head is located in described overcoat, and the lower end of described pedestal, the lower end of described connecting cylinder are connected on described transition head.
In a preferred embodiment, spring is folded with between described sliding cylinder and described pedestal.
In a preferred embodiment, the upper end of described sliding cylinder is radially outward convexly equipped with grab, and described grab is fastened in described draw-in groove, and the lower end of described sliding cylinder is radially-inwardly convexly equipped with sits ball pawl.
In a preferred embodiment, described push rod is connected on described upper sliding sleeve by shear pin, container cavity is formed between described upper sliding sleeve and described overcoat, annular chamber is formed between described connecting cylinder and described overcoat, described container cavity is connected with described annular chamber, be connected with described container cavity at the inlet opening of described fluid hole, described radial direction through hole, described pedestal, described annular chamber, and described shear pin is by under the state of cutting off, described push rod pushes against described telescoping tee and radially-inwardly moves to seat ball position.
In a preferred embodiment, the inside wall of described connecting cylinder is provided with latch, and the lower end outside of described backstay is connected with 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 near described horizontal well well head place is fastened in described backstay four draw-in grooves the draw-in groove be positioned at bottom, the upper end being arranged in the sliding cylinder of the undergauge sliding sleeve of middle described pressure break structure in three described pressure break structures is fastened on described backstay four draw-in grooves and is positioned at draw-in groove above draw-in groove bottom, the upper end of the sliding cylinder of the described undergauge sliding sleeve near described pressure reduction sliding sleeve place is fastened in described backstay four draw-in grooves the draw-in groove be positioned at below the draw-in groove of the top.
In a preferred embodiment, between described extension hanger and described multiple pressure break structure, be also connected with packer, described packer is for meeting water packer.
Feature 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, undergauge sliding sleeve is adopted to carry out fracturing work to each oil reservoir in down-hole, when carrying out fracturing work to the multiple oil reservoir in down-hole, multiple undergauge sliding sleeve be connected in series, by dropping into the identical ball of diameter from well head, just the undergauge sliding sleeve of multiple oil layer section can be opened in turn, the unlatching of this undergauge sliding sleeve is not by the restriction of pitching diameter, it not only can increase the transformation progression of oil reservoir, and ensure that the big orifice of tubing string, decrease operating risk, under facilitating later stage instrument, enter operation.The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, structure is simple, and it is convenient to install with constructing operation, and it substantially reduces completion and pressure break time, decreases operating risk, ensure that the big orifice of tubing string, enters operation under facilitating later stage instrument.
Two, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, adopts and meets water packer packing oil jacket annular space, compared with existing bore hole compression packer, have and set safety, adapt to the feature of irregular borehole.
Three, the fracturing integrated tubing string of open-hole horizontal well completion of the present invention, is connected to the chance water packer of extension hanger lower end, can effectively stop inclination section water layer on the impact of horizontal segment oil reservoir.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
Fig. 2 is the half sectional view that the undergauge sliding sleeve of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention is not opened.
Fig. 3 is the half sectional view of the undergauge sliding sleeve state one of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
Fig. 4 is the half sectional view of the undergauge sliding sleeve state two of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
Fig. 5 is the half sectional view of the undergauge sliding sleeve state three of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention.
Fig. 6 is the half sectional view after the undergauge sliding sleeve of the fracturing integrated tubing string of open-hole horizontal well completion of the present invention is opened.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, 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, multiple pressure break structure 3 and pressure reduction sliding sleeve 4.Wherein: docking oil pipe 1 is located in the sleeve pipe 5 of the 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; Multiple pressure break structure 3 to be connected on described extension hanger 2 and to be positioned at the net horizontal section 92 of described horizontal well, and each described pressure break structure 3 is connected and is connected, and it comprises the chance water packer 6 and undergauge sliding sleeve 7 that are connected; One end of pressure reduction sliding sleeve 4 is connected with described multiple pressure break structure 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 the upper sliding sleeve 721 wearing and 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 in described upper sliding sleeve 721 and be connected with push rod 723, telescoping tee 724 is folded with 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, sliding cylinder 732 and pedestal 733 is equipped with in described connecting cylinder 731, described sliding cylinder 732 axially movably can be located in the upper end of described pedestal 733, the lower end of described pedestal 733 is connected with described lower contact 75, backstay 734 and piston 735 is folded with between described pedestal 733 and described connecting cylinder 731, the upper end inner shafts of described backstay 734 is to offering multiple draw-in groove 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 the relative fluid hole of level 7311 and inlet opening 7331 respectively with on described pedestal 733, described piston 735 offers radial direction through hole 7351, under being fastened in the upper end of described sliding cylinder 732 state of described draw-in groove 7341 ' being positioned at top in multiple described draw-in groove 7341, described fluid hole 7311, described radial direction through hole 7351 are connected with the inlet opening 7331 of described pedestal 733.
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.
Multiple pressure break structure 3 is sequentially connected in series on extension hanger 2, it is positioned at the net horizontal section 92 of horizontal well, each pressure break structure 3 forms by chance water packer 6 and undergauge sliding sleeve 7, meet the upstream extremity that water packer 6 is connected to undergauge sliding sleeve 7, the downstream of multiple pressure break structure 3 is connected with float shoe 8 with pressure reduction sliding sleeve 4 by packer, in the present invention, the packer be connected between multiple pressure break structure 3 and pressure reduction sliding sleeve 4 can be and meets 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 chance water packer 6 is for packing oil jacket annular space, it is met water and just can self-expanding set, and setting, setting safe and reliable without the need to suppressing, this chance water packer 6 effectively can solve the sand card problem of mechanical packer, and is applicable to sealing irregular barefoot interval.
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 well head pitching, opens undergauge sliding sleeve 7, to carry out fracturing work to each oil reservoir of net horizontal section 92.This undergauge sliding sleeve 7 has top connection 71 connected successively, overcoat 74 and lower contact 75, the upper end of top connection 71 is connected with chance water packer 6, the threaded upper ends of overcoat 74 is connected to the lower end inside of top connection 71, the lower end of overcoat 74 is threaded in outside the upper end of lower contact 75, thus top connection 71, overcoat 74 and lower contact 75 are combined into one substantially in the body of cylindrical tube shape, this body has can for liquid and the centre bore 76 that passes through of pitching.Wherein, the upper end sidewall of overcoat 74 offers pressure break hole 741, the fracturing fluid each oil reservoir of horizontal well net horizontal section 92 being carried out to fracturing work is under this pressure break hole 741 Injection Well 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 pressure break hole 741 of overcoat 74 is blocked inside the upper sliding sleeve 721 of this undergauge mechanism 72 is connected to overcoat 74 upper end by shear pin 7214, 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 end is offered is connected with container cavity 7215; Push rod 723 is connected to the lower end inside of upper sliding sleeve 721 by shear pin 7231, and the admission chamber 7213 formed between push rod 723 and the lower end of upper sliding sleeve 721 is connected with container cavity 7215 by the inlet opening 7212 being opened in upper sliding sleeve 721 lower end; Low sleeve 722 is threaded in the lower end inside of upper sliding sleeve 721, is folded with telescoping tee 724 between the upper end of low sleeve 722 and push rod 723.In the present invention, this telescoping tee 724 is c-shaped ring-type substantially, and when push rod 723 axial downward movement extruding telescoping tee 724, external diameter and the internal diameter of telescoping tee 724 all radially-inwardly reduce, and telescoping tee 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 made up of the first connecting cylinder 7312 and the second connecting cylinder 7313, 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, annular chamber 7314 is connected with the container cavity 7215 formed between upper sliding sleeve 721 and overcoat 74.In the present embodiment, the upper end of the connecting cylinder 731 of undergauge sliding sleeve 7, is also the upper end of the first connecting cylinder 7312, is connected with spool 736, the low sleeve 722 of undergauge mechanism 72 slidably sealing shroud is located at outside the upper end of spool 736, and the lower end sealing 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 axially slidably be located in pedestal 733 upper end inside, in the present embodiment, spring 737 is folded with between sliding cylinder 732 and pedestal 733, by the resilient force of spring 737, sliding cylinder 732 opposite base 733 axial reciprocating is moved.In the present invention, the upper end of sliding cylinder 732 is radially outward convexly equipped with grab 7321, and its lower end is radially-inwardly convexly equipped with sits ball pawl 7322.
In one embodiment of this invention, lower contact 75 threaded upper ends of undergauge sliding sleeve 7 is connected with transition head 738, transition head 738 is located in overcoat 74, the lower end of the lower end of pedestal 733 and the second connecting cylinder 7313 of connecting cylinder 731 is threaded in outside the upper end of transition head 738 respectively, thus connecting cylinder 731, sliding cylinder 732, between pedestal 733 and transition head 738, forming a container cavity 739, backstay 734 and piston 735 are arranged in this container cavity 739.Wherein, backstay 734 is folded between sliding cylinder 732 and the first connecting cylinder 7312 of connecting cylinder 731, and the grab 7321 of sliding cylinder 732 upper end is fastened in one of them draw-in groove 7341 in the multiple axial draw-in groove 7341 offered inside backstay 734 upper end; Piston 735 is folded between pedestal 733 and the second connecting cylinder 7313 of connecting cylinder 731, piston 735 is sealedly connected on the inside wall of the second connecting cylinder 7313 by shear pin 7352, and seal with the lateral wall of pedestal 733 and contact, piston 735 blocks the inlet opening 7331 of pedestal 733 and the fluid hole 7311 of the second connecting cylinder 7313 respectively, now, the radial direction through hole 7351 piston 735 offered is not connected with fluid hole 7311 with inlet opening 7331.
When needs unlatching undergauge sliding sleeve 7 carries out fracturing work, first, as shown in Figure 2 undergauge sliding sleeve 7 is assembled, the upper end grab 7321 of the sliding cylinder 732 of undergauge sliding sleeve 7 is fastened on offer inside backstay 734 upper end except in any draw-in groove 7341 of top draw-in groove 7341 ', now, undergauge sliding sleeve 7 is in non-opening; Then, by oil reservoir position under undergauge sliding sleeve 7 lower going-into-well, from well head pitching, liquid in tubing string is located on the seat ball pawl 7322 of sliding cylinder 732 by also sitting in spherical zone to the centre bore 76 of undergauge sliding sleeve 7, now, arrange near pedestal 733 inwall owing to sitting ball pawl 7322, the restriction by pedestal 733 inwall is sat ball pawl 7322 and cannot be strutted; When 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 sliding cylinder 732 together axial downward movement, now, spring 737 is compressed by compressing of sliding cylinder 732, and sit ball pawl 7322 and shift out pedestal 733 inwall and softened, ball 10 drops down; Meanwhile, the grab 7321 of sliding cylinder 732 upper end drives backstay 734 axially to move down.Refer to shown in Fig. 4, when first ball 10 from sliding cylinder 732 through and after dropping, 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 grab 7321 of sliding cylinder 732 upper end is moved upward to the groove 7341 be positioned at above groove 7341 that initial card establishes, to wait for pitching next time by block the interior axis of groove 7341 of establishing from initial institute.
As shown in Figure 5, by that analogy, the second ball that diameter is identical is dropped into successively in undergauge sliding sleeve 7, 3rd ball etc., sliding cylinder 732 is made to drive the axial slide downward of backstay 734, until the lower end of backstay 734 contacts with the upper surface of piston 735, now, piston 735 at the pressure effect lower shaft of backstay 734 to moving down, the shear pin 7352 connecting piston 735 and the second connecting cylinder 7313 is cut off, piston 735 glides, till 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 bore 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, thus enter in the container cavity 7215 that upper sliding sleeve 721 and overcoat 74 formed, and enter in admission chamber 7213 through the inlet opening 7212 of upper sliding sleeve 721, push rod 723 is axial slide downward 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 hydraulic pressure continuous effect under, push rod 723 pushes against telescoping tee 724 and radially-inwardly moves, the external diameter of telescoping tee 724 and internal diameter reduce and enter the state of setting.
As shown in Figure 6, again from well head pitching 10 ', ball 10 ' to fall in telescoping tee 724 and sets, now, add the hydraulic pressure in Large central aperture 76, when the hydraulic pressure in centre bore 76 reaches certain numerical value, by the shear pin 7214 cut off between overcoat 74 and upper sliding sleeve 721, upper sliding sleeve 721 is axial slide downward under the effect of hydraulic pressure, in the present invention, the lower end of low sleeve 722 is radially-inwardly convexly equipped with location division 7221, when shear pin 7214 is cut off, and the upper end contact of spool 736 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 adding sand in the centre bore 76 of undergauge sliding sleeve 7, fracturing work is carried out to treat pressure break oil reservoir.
Undergauge sliding sleeve 7 of the present invention, when carrying out fracturing work to the multiple oil reservoir in down-hole, connects connected by multiple undergauge sliding sleeve 7, by meeting water packer 6 packing between each undergauge sliding sleeve 7.By dropping into the identical ball of diameter from well head, just the undergauge sliding sleeve 7 of multiple oil layer section can be opened in turn, the unlatching of this undergauge sliding sleeve 7 is not by the restriction of pitching diameter, which ensure that the big orifice of fracturing string, and increase the transformation progression of oil reservoir, decrease operating risk, facilitate later stage instrument smooth under enter.
The pressure reduction sliding sleeve 4 be connected with multiple pressure break structure 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 be opened and carry out the fracturing work of downhole oil layer under the effect of water injection pressure.
The round end float shoe 8 being connected to pressure reduction sliding sleeve 4 one end is float shoe well known in the prior art, and its concrete structure does not repeat them here.Enter under the effect of this round end float shoe 8 mainly ensures the safety of tubing string 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 lower end outside 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, is provided with groove 7343 at the lower end outside of backstay 734, 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 backstay 734 like this in the process axially moved down, be locked at step by step on connecting cylinder 731, the situation preventing backstay 734 from axially moving occurs.
The fracturing integrated tubing string of open-hole horizontal well completion of the present invention, its Completion Operations is as follows: first, after brill 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 fracturing integrated for open-hole horizontal well completion tubing string top is hung in protective casing 52; Secondly, well head connects pumping line, and direct circulation is by casing annulus drilling mud for clean, and then pitching builds the pressure, extension hanger 2 of giving up; Afterwards, top rod is hung sealing dropout by tail pipe and takes out, again change docking oil pipe 1 and insert extension hanger 2, and ensure this place's good seal; After 24 hours, it is complete that chance water packer 6 meets water automatic setting, packing oil jacket annular space; Now, pump hydraulic pressure in tubing string, pressure reduction sliding sleeve 4 is opened under the effect of hydraulic pressure, and to start pressure reduction sliding sleeve 4 fracturing work is carried out to oil reservoir; Finally, by dropping 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, its structure is simple, and it is convenient to install with constructing operation.Meanwhile, this chance water packer 6, compared with bore hole compression packer, has and sets safety, adapts to the feature of irregular borehole.The fracturing integrated tubing string of open-hole horizontal well completion adopts undergauge sliding sleeve 7 to realize carrying out fracturing work to each oil reservoir in down-hole, adopts the ball 10 that diameter is identical, opens the undergauge sliding sleeve 7 of multiple oil layer section, increases the progression of oil formation improvement.The fracturing integrated tubing string of this open-hole horizontal well completion substantially reduces completion and pressure break time, decreases operating risk, ensure that the big orifice of tubing string, enter operation under facilitating 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 is also connected with a packer, and this packer is for meeting water packer 6, and it can effectively stop inclination section water layer on the impact of each oil reservoir of net horizontal section 92.
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 near described horizontal well well head place is fastened in described backstay 734 4 draw-in grooves 7341 draw-in groove 7341 be positioned at bottom, the upper end being arranged in the sliding cylinder 732 of the undergauge sliding sleeve 7 of middle described pressure break structure 3 in three described pressure break structures 3 is fastened on described backstay 734 4 draw-in grooves 7341 and is positioned at draw-in groove 7341 above draw-in groove 7341 bottom, the upper end of the sliding cylinder 732 of the described undergauge sliding sleeve 7 near described pressure reduction sliding sleeve 4 place is fastened in described backstay 734 4 draw-in grooves 7341 draw-in groove being positioned at draw-in groove 7341 ' below topmost.
When dropping into first ball in the fracturing integrated tubing string of open-hole horizontal well completion, first undergauge sliding sleeve 7 near pressure reduction sliding sleeve 4 is unlocked, the telescoping tee 724 of this undergauge sliding sleeve 7 radially-inwardly moves to 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, thus carries out fracturing work; Drop into the 3rd ball afterwards, because three pressure break structures 3 are positioned at the undergauge sliding sleeve 7 of middle pressure break structure 3, in the process of front twice pitching, its telescoping tee 724 is in setting position, the 3rd ball now dropped into, the flowing hole 7211 of the upper sliding sleeve 721 making this undergauge sliding sleeve 7 is connected with pressure break hole 741, thus carries out fracturing work; Finally, drop into the 4th ball, due to the undergauge sliding sleeve 7 of the pressure break structure 3 near well head place, in the process of first three pitching, its telescoping tee 724 is in setting position, the 4th ball now dropped into, is connected the flowing hole 7211 of the upper sliding sleeve 721 making this undergauge sliding sleeve 7 with pressure break hole 741, thus carries out fracturing work.
The foregoing is only several embodiments of the present invention, those skilled in the art can carry out various change or modification to the embodiment of the present invention according to content disclosed in application documents and not depart from the spirit and scope of the present invention.
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:
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;
Multiple pressure break structure, it to be connected on described extension hanger and to be positioned at the net horizontal section of described horizontal well, and each described pressure break structures in series is connected, and it comprises the chance water packer and undergauge sliding sleeve that are 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 pressure break hole;
Undergauge mechanism, it has the upper sliding sleeve wearing and 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 in described upper sliding sleeve and be connected with push rod, be folded with telescoping tee between described push rod and described low sleeve, 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, sliding cylinder and pedestal is equipped with in described connecting cylinder, described sliding cylinder axially movably can be located in the upper end of described pedestal, the lower end of described pedestal is connected with described lower contact, backstay and piston is folded with between described pedestal and described connecting cylinder, multiple draw-in groove is axially arranged with inside the upper end of described backstay, 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 described pedestal offers respectively the relative fluid hole of level and inlet opening, described piston is provided with radial direction through hole, under being fastened in the upper end of described sliding cylinder the state of described draw-in groove being positioned at top in multiple described draw-in groove, described fluid hole, described radial direction through hole are connected with the inlet opening of described pedestal;
Pressure reduction sliding sleeve, its one end is connected with described multiple pressure break structure 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 to put by shear pin, the lower end of described low sleeve is radially-inwardly convexly equipped with location division, cut off at described shear pin, and the upper end contact of described spool is under the state of described location division, 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 first connecting cylinder is connected to the upper end of described second connecting cylinder, and described piston is connected on described 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 transition head, and described transition head is located in described overcoat, and the lower end of described pedestal, the lower end of described connecting cylinder are connected on described transition head.
6. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, is characterized in that, be folded with spring between described sliding cylinder and described pedestal.
7. 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 sliding cylinder is radially outward convexly equipped with grab, and described grab is fastened in described draw-in groove, and the lower end of described sliding cylinder is radially-inwardly convexly equipped with sits 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, container cavity is formed between described upper sliding sleeve and described overcoat, annular chamber is formed 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 is connected with described container cavity, and described shear pin is by under the state of cutting off, described push rod pushes against described telescoping tee and radially-inwardly moves to seat ball position.
9. the fracturing integrated tubing string of open-hole horizontal well completion as claimed in claim 1, it is characterized in that, the inside wall of described connecting cylinder is provided with latch, and the lower end outside of described backstay is connected with 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 near described horizontal well well head place is fastened in described backstay four draw-in grooves the draw-in groove be positioned at bottom, the upper end being arranged in the sliding cylinder of the undergauge sliding sleeve of middle described pressure break structure in three described pressure break structures is fastened on described backstay four draw-in grooves and is positioned at draw-in groove above draw-in groove bottom, the upper end of the sliding cylinder of the described undergauge sliding sleeve near described pressure reduction sliding sleeve place is fastened in described backstay four draw-in grooves the draw-in groove be positioned at below the draw-in groove of the top.
The fracturing integrated tubing string of 11. open-hole horizontal well completion as claimed in claim 1, is characterized in that, between described extension hanger and described multiple pressure break structure, be also connected with packer, and 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 true CN103422846B (en) | 2015-11-18 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN104405338B (en) * | 2014-12-01 | 2017-02-22 | 中国石油天然气股份有限公司 | Casing fracturing ball seat |
| CN109267983B (en) * | 2017-07-17 | 2021-08-27 | 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 repeated fracturing device and method based on open hole preset pipe string well completion |
| CN113530512B (en) * | 2020-04-22 | 2023-04-25 | 中国石油天然气股份有限公司 | Fracturing string and fracturing method |
| CN114856491B (en) * | 2021-02-04 | 2023-12-26 | 中国石油天然气股份有限公司 | Sliding double-ball pump bottom valve |
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