CN102410009B - Controlled-valve placed well-cementing staged-fracturing well-completion string and hydraulically-controlled switch string - Google Patents
Controlled-valve placed well-cementing staged-fracturing well-completion string and hydraulically-controlled switch string Download PDFInfo
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- CN102410009B CN102410009B CN201110291721.9A CN201110291721A CN102410009B CN 102410009 B CN102410009 B CN 102410009B CN 201110291721 A CN201110291721 A CN 201110291721A CN 102410009 B CN102410009 B CN 102410009B
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Abstract
The invention discloses a controlled-valve placed well-cementing staged-fracturing well-completion string and a hydraulically-controlled switch string, which are suitable to be applied to a well-completion process for horizontal wells and vertical wells, and through tripping in the hydraulically-controlled switch string to start and close the controlled-valve placed well-cementing staged-fracturing well-completion string, multi-layer-and-section fracturing well-completion construction is realized, thereby meeting the needs of development on low-permeability oil reservoirs and unconventional oil/gas resources. The controlled-valve placed well-cementing staged-fracturing well-completion string, from top to bottom, is sequentially connected with a hydraulically-controlled switch tool detention cylinder, a switchable control valve and hydraulic casing centralizers connected with the two ends of the switchable control valve, a pressed settling valve and a bottom circulating valve by using a casing; and at least a set of switchable control valve and hydraulic casing centralizers connected with the two ends of the switchable control valve are equipped in the string. The hydraulically-controlled switch string comprises hydraulically-controlled switch tools and a continuous oil pipe, and a set of hydraulically-controlled switch tool is connected to the bottom of the continuous oil pipe. The switchable control valves are same in inner drift diameter (same in size), and can carry out well completion on stratums through the sand fracturing of the casing, thereby satisfying the needs of large-displacement and large-scale fracturing reformation.
Description
Technical field
The present invention relates to the completion system of petroleum industry, particularly settle well-cementing staged-fracturing completion tubular column and the pilot-controlled switch tubing string of controlled valve, be applicable to the well-completing process of horizontal well and straight well, be lowered to a pilot-controlled switch tubing string and open and close the well-cementing staged-fracturing completion tubular column of settling controlled valve, realize the pressure break completion construction of multi-section multi-layer, meet the exploitation needs of low-permeability oil deposit and unconventional petroleum resources.
Background technology
At present, utilizing staged fracturing of horizontal well renovation technique to improve the unconventional development of resources application scale such as low-permeability oil deposit and shale oil gas progressively strengthens.But conventional horizontal well open hole packer segmentation well completion at present, as: the fracturing integrated tubing string of horizontal well completion that application number is 200920248979.9, open step by step sliding sleeve staged fracturing technology by pitching, for allow the ball that drops into can by, arrive the pressure break well completion interval of below, the ball seat internal diameter of below must be less than the ball seat internal diameter of upper level, the impact that arranged by the classification of ball seat size, its number of fragments and pressure break scale are all very limited, and have affected correctional effect; And this sliding sleeve is pitching sliding sleeve, ball opens sliding sleeve after dropping into, and the later stage cannot close while production again.As the later stage will selectively produce or when the transformation of refracturing repeatedly, need close sliding sleeve, this integrated pipe column entirety cannot be used.Can only again in this tubing string, be lowered to oil pipe fracturing string, carry out staged fracturing in small-scale pipe, therefore in the follow-up construction after completion, can not meet user demand., easily there is operating trouble in the structure relative complex of the fracturing integrated tubing string of this utility model completion simultaneously.In the exploitation of low-permeability oil deposit and unconventional petroleum resources, for the straight well of multistage pressure break, particularly tubular column structure complexity, the high horizontal well of technical requirements also do not have a kind of casing fracturing completion method can solve an above-mentioned difficult problem, are restricting the exploitation of low-permeability oil deposit and unconventional petroleum resources.
Summary of the invention
The object of this invention is to provide well-cementing staged-fracturing completion tubular column and the pilot-controlled switch tubing string of settling controlled valve, solve in current sleeve pipe staged fracturing completion construction, the staged fracturing technology of opening step by step sliding sleeve by pitching is affected by radial sector arrangement in ball seat, the problem that number of fragments and pressure break scale are restricted, improve the correctional effect on stratum, improve pressure break scale and efficiency.
Technical solution of the present invention can reach above-mentioned purpose:
Settle the well-cementing staged-fracturing completion tubular column of controlled valve use sleeve pipe 1 connect successively from top to bottom hydraulic control switching tools be detained cylinder 2, can switching control pilot 4 and the hydraulic casing pipe centering device 3, the bruising that connect at two ends be located valve 6 and bottom cycle valve 7; In this tubing string, at least configure one group can switching control pilot 4 and connect at two ends hydraulic casing pipe centering device 3.In the time that pressure break completion is carried out in multistage stratum, need in tubing string, configure many groups can switching control pilot 4 and connect at two ends hydraulic casing pipe centering device 3.
Comprise pilot-controlled switch instrument 10 and coiled tubing 9 for the pilot-controlled switch tubing string that opens and closes the well-cementing staged-fracturing completion tubular column of settling controlled valve, a set of pilot-controlled switch instrument 10 is connected to coiled tubing 9 bottoms.Pilot-controlled switch instrument 10 comprises top connection 10-1, adjustable ring 10-2, drives cylinder 10-5, mechanism for opening/closing, central tube 10-8, piston 10-9 and lower contact 10-11, top connection 10-1, central tube 10-8 are connected successively with lower contact 10-11, connect successively adjustable ring 10-2, mechanism for opening/closing, driving cylinder 10-5 and piston 10-9 in its outside, between piston 10-9 and driving cylinder 10-5, baffle ring 10-6 and spring 10-7 are installed; It is corresponding with the inner chamber of piston 10-9 that the body of central tube 10-8 is provided with inlet opening.
The present invention has following significant effect and progress:
1, in pressure break completion tubular column of the present invention, can switching control pilot adopt the interior latus rectum of same size, do not use pitching method, the problem that does not exist interior latus rectum to dwindle step by step, what can guarantee that each pressure break well completion interval all uses maximum inner diameter can switching control pilot implements casing fracturing completion.Can adopt sleeve pipe sand fracturing completion to stratum, meet the needs of large discharge capacity, extensive fracturing reform, increase fracture length, crack quantity and flow conductivity, effectively improve production capacity and recovery ratio.
2, at the horizontal segment of horizontal well or multiple pressure break well completion intervals of straight well, can in well-cementing staged-fracturing completion tubular column, place as required multiple can switching control pilot, its can switching control pilot design specifications unified, interior latus rectum is large, can use same set of pilot-controlled switch instrument to complete the keying that can switching control pilot of multiple pressure break completions, pressure break divides number of stages unrestricted, meets the needs of large discharge capacity, extensive fracturing reform.
3, the pressing crack construction of multiple fractured intervals can complete continuously, without pilot-controlled switch tubing string is proposed to ground, easy to operate, has improved pressure break efficiency, saves pressure break expense and well-completing process simple, safe and reliable, greatly reduces construction cost.
4,, without perforation, perforating job expense and activity duration have been saved.
5, in later stage production, can use pilot-controlled switch instrument, be lowered in pressure break completion tubular column, optionally open or close that any one pressure break completion uses can switching control pilot, meet the requirement of selective production and refracturing transformation, having solved prior art pressure break completion tubular column can not be repeated to open, close, can not selectively produce and the difficult problem of refracturing, there is significant economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 be can switching control pilot in the present invention structural representation.
Fig. 2 is the structural representation of pilot-controlled switch instrument in the present invention.
Fig. 3 is the working state schematic representation can switching control pilot in pilot-controlled switch TO pressure break completion tubular column in the present invention time.
Fig. 4 is that in the present invention, pilot-controlled switch instrument cuts out in pressure break completion tubular column the working state schematic representation can switching control pilot time.
Fig. 5 is the structural representation of settling the well-cementing staged-fracturing completion tubular column of controlled valve in the present invention.
Fig. 6 is the structural representation of pilot-controlled switch tubing string in the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Settle the well-cementing staged-fracturing completion tubular column of controlled valve use sleeve pipe 1 connect successively from top to bottom hydraulic control switching tools be detained cylinder 2, can switching control pilot 4 and the hydraulic casing pipe centering device 3, the bruising that connect at two ends be located valve 6 and bottom cycle valve 7; In this tubing string, at least configure one group can switching control pilot 4 and connect at two ends hydraulic casing pipe centering device 3.In the time that pressure break completion is carried out in multistage stratum, need in tubing string, configure many groups can switching control pilot 4 and connect at two ends hydraulic casing pipe centering device 3
.
Can comprise outer sleeve 4-3 and inner sliding sleeve 4-7 by switching control pilot 4, outer sleeve 4-3 is provided with fluid course 4-6, and inner sliding sleeve 4-7 is loaded in outer sleeve 4-3, and outer sleeve 4-3 two ends connect top connection 4-1 and lower contact 4-9.The inner circle of the upper sleeve of inner sliding sleeve 4-7 is provided with opens with hook shoulder 4-4, and its top cylindrical shell is provided with positioning bar, and its underpart cylindrical shell inner circle is provided with closes with hook shoulder 4-8; The outside of positioning bar is provided with positioning boss 4-10.In the fluid course 4-6 of outer sleeve 4-3 overhead cylinder inner circle, be provided with and open with detent 4-2 and close and use detent 4-11, open with detent 4-2 and close and use detent 4-11 all to coordinate location with the positioning boss 4-10 of inner sliding sleeve 4-7
.when using the mechanism for opening/closing of pilot-controlled switch instrument 10 to open or close can switching control pilot 4 time, the positioning boss 4-10 of inner sliding sleeve 4-7 falls into and opens with detent 4-2 or close with detent 4-11, and the inner sliding sleeve 4-7 after opening or closing is located.In outer sleeve 4-3 inner circle, top connection 4-1 is more than or equal to the cylindrical shell length of inner sliding sleeve 4-7 to the distance of fluid course 4-6 upper port, avoids the cylindrical shell of inner sliding sleeve 4-7 to block fluid course 4-6.Junction at both sides, top connection 4-1 and the lower contact 4-9 of the fluid course 4-6 of outer sleeve 4-3 is equipped with seal, in figure, represents with seal 4-5.
It is cylindrical body that two ends are provided with thread that pilot-controlled switch instrument is detained cylinder 2, and its internal diameter is greater than the external diameter of the pilot-controlled switch instrument 10 on pilot-controlled switch tubing string, and its annular space area of passage equals the area of passage of supporting sleeve pipe.In the time that upper extract control switch tubing string carries out pressure break completion practice, pilot-controlled switch instrument 10 can be trapped in pilot-controlled switch instrument delay cylinder 2 and reduce chock pressure difference, avoids tool wear.
Comprise pilot-controlled switch instrument 10 and coiled tubing 9 for the pilot-controlled switch tubing string that opens and closes the well-cementing staged-fracturing completion tubular column of settling controlled valve, a set of pilot-controlled switch instrument 10 is connected to coiled tubing 9 bottoms.Pilot-controlled switch instrument 10 comprises top connection 10-1, adjustable ring 10-2, drives cylinder 10-5, mechanism for opening/closing, central tube 10-8, piston 10-9 and lower contact 10-11, top connection 10-1, central tube 10-8 are connected successively with lower contact 10-11, connect successively adjustable ring 10-2, mechanism for opening/closing, driving cylinder 10-5 and piston 10-9 in its outside, between piston 10-9 and driving cylinder 10-5, baffle ring 10-6 and spring 10-7 are installed; It is corresponding with the inner chamber of piston 10-9 that the body of central tube 10-8 is provided with inlet opening.Mechanism for opening/closing comprises keying operating block 10-3 and drive block 10-4, opens and closes operating block 10-3 and drive block 10-4 hinge and connects; The one end that opens and closes operating block 10-3 is release slope, and its outside is provided with hook draw-in groove, this hook draw-in groove with can switching control pilot in the unlatching of inner sliding sleeve 4-7 coordinate with hook shoulder 4-4 or coordinate with hook shoulder 4-8 with closing, the outside of drive block 10-4 is arc; Open and close the non-release slope end of operating block 10-3 and one end hinge of drive block 10-4 and connect, open and close the release slope end of operating block 10-3 and the other end of drive block 10-4 and connect with the top of top connection 10-1 and the upper end hinge of driving cylinder 10-5 respectively; This mechanism for opening/closing is at least provided with three covers, is axially disposed within top connection 10-1 and drives between cylinder 10-5.The place of being tightly connected at lower contact 10-11 and piston 10-9 is provided with sealing ring, in Fig. 2, represents with sealing ring 10-10.The working state schematic representation that opens or closes the pilot-controlled switch instrument 10 can switching control pilot 4 time is represented by Fig. 3 and Fig. 4.In Fig. 3 and Fig. 4, B represents to be equipped with pressure break completion tubular column that can switching control pilot 4; A represents pilot-controlled switch tubing string.
Use coiled tubing to connect a set of pilot-controlled switch instrument in its bottom, be in a set of pilot-controlled switch tubing string, connect 10, one of two pilot-controlled switch instruments can switching control pilot 4 for opening, another can switching control pilot 4 for closing.Two pilot-controlled switch instruments 10 closure on tubing string is contrary or relatively, makes the installation direction of keying operating block 10-3 of two pilot-controlled switch instruments 10 contrary or relatively.
Take construction in horizontal well as the concrete construction method of example
First according to stratum need to configure can switching control pilot 4 quantity and by the well-cementing staged-fracturing completion tubular column G.I.H connecting, concrete technology is as follows:
1, this process pipe string is used and can behind switching sliding sleeve 4 installation sites, be carried out connecting of completion tubular column in definite staged fracturing sum of series pressure break completion, the completion tubular column G.I.H connecting is pumped into cementing concrete 8 cements the well, drop into long wing cementing plug 5 and pump into displacement fluid, long wing cementing plug 5 continues voltage stabilizing after arriving shaft bottom and being located valve 6 bruisings with bruising, hydraulic casing pipe centering device 3 is started working, guarantee horizontal segment casing centralization, improve cementing quality and subsection efect.
2, after well cementation completion, the wellhead assembly of salable coiled tubing 9 is installed, is connected pilot-controlled switch tubing string referring to Fig. 6.
In the time of needs staged fracturing completion, the casing fracturing work progress of each well section is as follows:
A: for pilot-controlled switch tubing string is beaten hydraulic pressure, hydraulic pressure enters from coiled tubing 9 in the central tube 10-8 of pilot-controlled switch instrument 10, inlet opening from body enters in piston 10-9, promote piston 10-9 Compress Spring 10-7, piston 10-9 promotes to drive cylinder 10-5 simultaneously, thereby drive drive block 10-4, making to open and close operating block 10-3 stretches out, block the unlatching hook shoulder 4-4 on can the inner sliding sleeve 4-7 of switching control pilot 4, that opens interval of interest in well-cementing staged-fracturing completion tubular column by pilot-controlled switch instrument 10 can switching control pilot 4;
B: be the release of pilot-controlled switch tubing string, the keying operating block 10-3 that makes pilot-controlled switch instrument 10 departs from hook shoulder 4-4 with unlatching that can switching control pilot 4;
C: upper extract control switch tubing string, make two pilot-controlled switch instruments 10 all enter pilot-controlled switch instrument and be detained in cylinder 2, from well head pressure break completion tubular column, carry out pressure break, complete the casing fracturing construction of this section;
D: transfer pilot-controlled switch tubing string, for pilot-controlled switch tubing string is beaten hydraulic pressure, hydraulic pressure enters in central tube 10-8 from coiled tubing 9, inlet opening from body enters in piston 10-9, promote piston 10-9 Compress Spring 10-7, piston 10-9 promotes to drive cylinder 10-5 simultaneously, thereby drive drive block 10-4 to make to open and close to block when operating block 10-3 stretches out closing with hook shoulder 4-8 on can the inner sliding sleeve 4-7 of switching control pilot 4, liquid for plugging circulation road 4-6, that closes interval of interest in well-cementing staged-fracturing completion tubular column by pilot-controlled switch instrument 10 can switching control pilot 4;
E: be the release of pilot-controlled switch tubing string, make the keying operating block 10-3 of pilot-controlled switch instrument 10 and can closing of switching control pilot 4 use hook shoulder 4-8 to depart from;
F: above carry or transfer pilot-controlled switch tubing string to new interval of interest and repeat above-mentioned operation continuation construction; Or pilot-controlled switch tubing string is carried to ground, normally carried out follow-up construction.
Claims (7)
1. settle the well-cementing staged-fracturing completion tubular column of controlled valve, it is characterized in that, use sleeve pipe (1) connect successively from top to bottom hydraulic control switching tools be detained cylinder (2), can switching control pilot (4) and the hydraulic casing pipe centering device (3), the bruising that connect at two ends be located valve (6) and bottom cycle valve (7); Can comprise outer sleeve (4-3) and inner sliding sleeve (4-7) by switching control pilot (4), outer sleeve (4-3) is provided with fluid course (4-6), inner sliding sleeve (4-7) is loaded in outer sleeve (4-3), and outer sleeve (4-3) two ends connect top connection (4-1) and lower contact (4-9); The inner circle of inner sliding sleeve (4-7) upper sleeve is provided with opens with hook shoulder (4-4), its top cylindrical shell is provided with positioning bar, its underpart cylindrical shell inner circle is provided with closes with hook shoulder (4-8), and the outside of positioning bar is provided with positioning boss (4-10); Cylindrical shell inner circle above the fluid course (4-6) of outer sleeve (4-3) is provided with opens with detent (4-2) and closes with detent (4-11), opens with detent (4-2) and closes and use detent (4-11) all to coordinate with the positioning boss (4-10) of inner sliding sleeve (4-7).
2. the well-cementing staged-fracturing completion tubular column of arrangement controlled valve according to claim 1, it is characterized in that, in described outer sleeve (4-3) inner circle, top connection (4-1) is more than or equal to the cylindrical shell length of inner sliding sleeve (4-7) to the distance of fluid course (4-6) upper port; Junction in both sides, top connection (4-1) and the lower contact (4-9) of the fluid course (4-6) of outer sleeve (4-3) is equipped with seal.
3. the well-cementing staged-fracturing completion tubular column of arrangement controlled valve according to claim 1, it is characterized in that, it is the cylindrical body that two ends are provided with thread that described pilot-controlled switch instrument is detained cylinder (2), and its internal diameter is greater than the external diameter of the pilot-controlled switch instrument (10) on pilot-controlled switch tubing string
, its annular space area of passage equals the area of passage of supporting sleeve pipe.
4. for opening and closing the pilot-controlled switch tubing string of well-cementing staged-fracturing completion tubular column of arrangement controlled valve claimed in claim 1, it is characterized in that, comprise pilot-controlled switch instrument (10) and coiled tubing (9), a set of pilot-controlled switch instrument is connected to coiled tubing (9) bottom, pilot-controlled switch instrument (10) comprises top connection (10-1), adjustable ring (10-2), drive cylinder (10-5), mechanism for opening/closing, central tube (10-8), piston (10-9) and lower contact (10-11), top connection (10-1), central tube (10-8) is connected successively with lower contact (10-11), at top connection (10-1), central tube (10-8) is connected adjustable ring (10-2) successively with the outside of lower contact (10-11), mechanism for opening/closing, drive cylinder (10-5) and piston (10-9), between piston (10-9) and driving cylinder (10-5), baffle ring (10-6) and spring (10-7) are installed, it is corresponding with the inner chamber of piston (10-9) that the body of central tube (10-8) is provided with inlet opening, mechanism for opening/closing comprises keying operating block (10-3) and drive block (10-4), opening and closing operating block (10-3) connects with drive block (10-4) hinge, this mechanism for opening/closing is at least provided with three covers, is axially disposed within top connection (10-1) and drives between cylinder (10-5).
5. pilot-controlled switch tubing string according to claim 4, it is characterized in that, one end of described keying operating block (10-3) is release slope, its outside is provided with hook draw-in groove, this hook draw-in groove with can switching control pilot (4) in the hook shoulder for unlatching (4-4) of inner sliding sleeve (4-7) coordinate or coordinate with hook shoulder (4-8) with closing, the outside of drive block (10-4) is arc; Open and close the non-release slope end of operating block (10-3) and one end hinge of drive block (10-4) and connect, open and close the release slope end of operating block (10-3) and the other end of drive block (10-4) and connect with the top of top connection (10-1) and the upper end hinge of driving cylinder (10-5) respectively.
6. pilot-controlled switch tubing string according to claim 5, is characterized in that, the hook draw-in groove of described keying operating block (10-3) is right-angle side on one side, and another side is hypotenuse.
7. pilot-controlled switch tubing string according to claim 4, it is characterized in that, use coiled tubing to connect a set of pilot-controlled switch instrument in its bottom, be in a pilot-controlled switch tubing string, to connect two pilot-controlled switch instruments (10), the closure of two pilot-controlled switch instruments (10) on tubing string is contrary or relative.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110291721.9A CN102410009B (en) | 2011-09-30 | 2011-09-30 | Controlled-valve placed well-cementing staged-fracturing well-completion string and hydraulically-controlled switch string |
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| CN201110291721.9A CN102410009B (en) | 2011-09-30 | 2011-09-30 | Controlled-valve placed well-cementing staged-fracturing well-completion string and hydraulically-controlled switch string |
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| CN102410009A CN102410009A (en) | 2012-04-11 |
| CN102410009B true CN102410009B (en) | 2014-06-11 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103573239B (en) * | 2012-07-31 | 2016-01-20 | 中国石油化工股份有限公司 | The using method of segmented fracturing device and this device |
| CN103775047B (en) * | 2012-10-25 | 2016-03-02 | 中国石油化工股份有限公司 | Sliding sleeve switch device |
| CN104165047B (en) * | 2013-05-17 | 2016-12-28 | 中国石油化工股份有限公司 | Sliding sleeve switch tubing string and using method thereof |
| CN103498656B (en) * | 2013-10-22 | 2016-09-07 | 中国石油天然气股份有限公司 | The latus rectum multiple fracturing tubing strings such as falcon slot type |
| CN105317414A (en) * | 2014-05-28 | 2016-02-10 | 中国石油化工股份有限公司 | Staged fracturing device and method for fracturing through device |
| CN104533344B (en) * | 2014-11-06 | 2017-08-25 | 长江大学 | A kind of fluid pressure type sliding sleeve switch instrument |
| CN108868732B (en) * | 2018-07-26 | 2020-11-06 | 东北石油大学 | Tool of coiled tubing separate-layer fracturing system and separate-layer fracturing method thereof |
| CN114482958A (en) * | 2020-10-26 | 2022-05-13 | 中国石油化工股份有限公司 | Casing cementing full-bore infinite staged fracturing well completion device and fracturing well completion method thereof |
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