CN102808584B - Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method - Google Patents
Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method Download PDFInfo
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Abstract
The invention discloses a mechanical plug pipe column for multi-point discharge of a cased hole completion multi-section fractured horizontal well and a water plugging method. The water plugging pipe column comprises a pipe plug and a Y445-type releasing packer, wherein at least three Y441-type packers are arranged between the pipe plug and the Y445-type releasing packer at intervals; sealed oil layer packing sections and water outlet layer packing sections are formed between two adjacent Y441-type packers and the inner wall of a horizontal well sleeve; a security joint and a control switch are orderly connected between the two Y441-type packers on each oil layer packing section through oil pipes in series; the security joint is serially connected between the two Y441-type packers on each water outlet layer packing section through the oil pipe; and the oil layer packing sections and the water outlet layer packing sections are connected in series through the oil pipes. According to the mechanical plug pipe column for multi-point discharge of the cased hole completion multi-section fractured horizontal well and the water plugging method, a plurality of Y441-type packers are adopted to be in multi-stage combination with the control switch, so that effective plugging of multi-point discharge of the multi-section fractured horizontal well or any point discharge is achieved; effective production of a major reservoir section is achieved, and the effects of controlling water and increasing oil are achieved.
Description
Technical field
The present invention relates to the water plugging string in a kind of oil extraction in oil field technical field and shutoff method, particularly relate to mechanical water plugging pipe string and the shutoff method of the water outlet of a kind of cased hole completion multistage pressure break horizontal well multiple spot.
Background technology
In field of petroleum exploitation, due to horizontal well self well track, flooding pattern complicated and changeable, and each oil reservoir lithology, physical property are different with properties of fluid in bearing stratum, and horizontal well easily causes the water outlet of horizontal well multiple spot after going into operation, and affects horizontal well development effect.In order to play horizontal well development potential better, oil worker both domestic and external has carried out the water-plugging technology research of horizontal well; The domestic and international outlook for mechanical water plugging technology comparative maturity for orientation at present, but also immature for horizontal well multiple spot water exit interval mechanical water shut off technology.Therefore, be level of control well multiple spot water exit interval water outlet effectively, reach the effect of water-control oil-increasing, become the important technology difficult problem needing in the industry to solve.
As water blockoff combined string is looked in Chinese utility model patent " fishable and drillable water plugging of horizontal well process pipe string " (notification number: CN201269077), Chinese invention patent application " a kind of annular chemical packer material for water plugging of horizontal well " (publication number: CN101899291A) and the layering of Chinese utility model patent " 51/2 " well-case perforating completion horizontal well machinery " (notification number: CN201321833) just describe relevant technical scheme.Wherein, " fishable and drillable water plugging of horizontal well process pipe string " can only realize two-stage sealing, namely can only be applied to the shutoff of single-point water outlet, cannot realize the shutoff of multiple spot water outlet; " kind annular chemical packer material for water plugging of horizontal well " is applied to sieve tube completion horizontal well; Water blockoff combined string is looked in the layering of " 51/2 " well-case perforating completion horizontal well machinery " for looking for stifled integrated one-trip string; namely water plugging string is connected with flow string; in manufacturing process, tubing string occurs to wriggle and easily causes packer to lose efficacy; water blockoff period of validity is short; adopt votage control switch simultaneously; when suppressing, easy build-up of pressure is obscured, and easily causes water blockoff to lose efficacy.
For this reason, for the effective shutoff of machinery of the water outlet of horizontal well multiple spot or arbitrfary point water outlet, realize controlling to increase oil, the object of well development effect of improving the standard, the present invention proposes mechanical water plugging pipe string and the shutoff method of the water outlet of a kind of cased hole completion multistage pressure break horizontal well multiple spot.
Summary of the invention
The object of this invention is to provide one and can carry out effective machine plugging to the water outlet of horizontal well multiple spot or arbitrfary point water outlet, realize water-control oil-increasing, the mechanical water plugging pipe string of the cased hole completion multistage pressure break horizontal well multiple spot water outlet of well development effect of improving the standard.
Another object of the present invention is to provide one can carry out effective machine plugging to the water outlet of horizontal well multiple spot or arbitrfary point water outlet, realizes water-control oil-increasing, the shutoff method of well development effect of improving the standard.
For achieving the above object, the present invention proposes the mechanical water plugging pipe string of a kind of cased hole completion multistage pressure break horizontal well multiple spot water outlet, and described mechanical water plugging pipe string comprises: plug and Y445 type back-off packer, be arranged at end and the front end of mechanical water plugging pipe string respectively; At least three Y441 type packers, be arranged at intervals between described plug and described Y445 type back-off packer, and between Y441 type packer adjacent between two and the inwall of horizontal well casing pipe, form at least one oil reservoir packing section and at least one water-yielding stratum packing section of sealing; Safety joint and gauge tap is serially connected with successively by oil pipe between two Y441 type packers of each described oil reservoir packing section, between two Y441 type packers of each described water-yielding stratum packing section, be connected to safety joint by oil pipe string, described oil reservoir packing section is connected in series by oil pipe with described water-yielding stratum packing section.
The mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot as above water outlet, wherein, described gauge tap is ball-and-seat or sliding sleeve switch or time switch.
The mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot as above water outlet, wherein, described mechanical water plugging pipe string is arranged at the horizontal segment of horizontal well, and described mechanical water plugging pipe string is separated with the flow string of the vertical section being arranged at horizontal well.
The mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot as above water outlet, wherein, is provided with safety joint between the Y441 type packer that described Y445 type back-off packer is adjacent.
The invention allows for a kind of shutoff method, adopt the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot as above water outlet, described shutoff method is by suppressing Y441 type packer, Y445 type back-off packer, down-hole casing space is divided into multiple packing region, realizes the water pack off of multistage pressure break horizontal well multiple spot water outlet.
Shutoff method as above, wherein, described shutoff method comprises: by mechanical water plugging pipe string down to horizontal well desired location; Suppress and set Y441 type packer, Y445 type back-off packer, make at least one oil reservoir packing section and at least one water-yielding stratum packing section of forming sealing in sleeve pipe; Open gauge tap, oil layer section is connected with the oil pipe of oil reservoir packing section, realizes the production of oil layer section.
Shutoff method as above, wherein, described gauge tap is ball-and-seat, described suppress set Y441 type packer, Y445 type back-off packer after, continue to suppress Y445 type back-off packer, described ball-and-seat in process of production is automatically opened under differential pressure action in oil layer section and oil pipe, realizes the production of oil layer section.
Shutoff method as above, wherein, described gauge tap is sliding sleeve switch, described suppress set Y441 type packer, Y445 type back-off packer after, continue to suppress Y445 type back-off packer, then in oil pipe, drop into the spheroid corresponding with sliding sleeve switch one by one, open the sliding sleeve switch of oil layer section one by one, realize the production of oil layer section.
Shutoff method as above, wherein, described gauge tap is time switch, described by mechanical water plugging pipe string down to before desired location, open or close acquisition time first at ground setting time switch; Suppress set Y441 type packer, Y445 type back-off packer time, time switch is closed condition; Suppress set Y441 type packer, after Y445 type back-off packer completes, time switch is converted to open mode, is communicated with the oil pipe of oil layer section and oil reservoir packing section, realizes the production of oil layer section.
Compared with prior art, the present invention has following characteristics and advantage:
1, down-hole casing space is divided into multiple packing region by multiple Y441 type packer by the present invention, form the oil reservoir packing section corresponding to oil layer section and the water-yielding stratum packing section corresponding to water exit interval, water-yielding stratum packing section is used for Plugging Water Zones section, oil reservoir packing section is used for oil-separating layer section, gauge tap is utilized to control the oil pipe of oil reservoir packing section and being communicated with or closing of oil layer section, realize the effective shutoff of machinery of the multiple spot water outlet of multistage pressure break horizontal well or arbitrfary point water outlet, and effective production of major oil reservoir section, reach the effect of water-control oil-increasing.
2, the present invention adopts Y445 type back-off packer to give up in net horizontal section by mechanical water plugging pipe string, mechanical water plugging pipe string is separated with the flow string of the vertical section being arranged at horizontal well, effectively avoiding wriggles due to flow string causes the phenomenon of net horizontal section water plugging string seal failure, effectively improves the period of validity of water pack off.
Accompanying drawing explanation
Accompanying drawing described here only for task of explanation, and is not intended to limit scope disclosed by the invention by any way.In addition, the shape of each parts in figure and proportional sizes etc. are only schematic, for helping the understanding of the present invention, are not the shape and the proportional sizes that specifically limit each parts of the present invention.Those skilled in the art under the teachings of the present invention, can select various possible shape and proportional sizes to implement the present invention as the case may be.
Fig. 1 is the structural representation of the embodiment of the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot of the present invention water outlet;
Fig. 2 is the structural representation of another embodiment of the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot of the present invention water outlet.
Description of reference numerals:
1-oil pipe; 2-Y445 type back-off packer; 3-Y441 type packer; 4-safety joint; 5-gauge tap; 6-plug; 7-oil reservoir packing section; 8-water-yielding stratum packing section; 9-oil layer section; 10-water exit interval; 11-flow string; 12-sleeve pipe.21,22,23,24,25-specking.
Detailed description of the invention
By reference to the accompanying drawings with the description of the specific embodiment of the invention, can clearly understand details of the present invention.But the specific embodiment of the present invention described here, only for explaining object of the present invention, and can not to be understood as by any way be limitation of the present invention.Under the teachings of the present invention, technician can conceive based on distortion possible arbitrarily of the present invention, and these all should be regarded as belonging to scope of the present invention.
Please refer to Fig. 1, is the structural representation of the embodiment of the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot of the present invention water outlet.As shown in Figure 1, the mechanical water plugging pipe string of the cased hole completion multistage pressure break horizontal well multiple spot water outlet that the present invention proposes, comprise oil pipe 1, Y445 type back-off packer 2, Y441 type packer 3, safety joint 4, gauge tap 5 and plug 6, wherein, plug 6 is arranged at the end (namely away from one end of well head) of whole endowel, and Y445 type back-off packer 2 is arranged at the front end (namely near one end of well head) of whole endowel; Multiple Y441 type packer is provided with at intervals between plug 6 and described Y445 type back-off packer 2, in the present embodiment, be provided with four Y441 type packers, can certainly need to arrange three, five, six or more Y441 type packers according to operating mode, the quantity of the present invention to Y441 type packer is not restricted.At least one the oil reservoir packing section 7 sealed and at least one water-yielding stratum packing section 8 sealed is formed between Y441 type packer adjacent between two and the inwall of horizontal well casing pipe, the position of oil reservoir packing section 7 corresponds to oil layer section 9, for oil-separating layer section 9, to produce; Water-yielding stratum packing section 8 corresponds to water exit interval 10, for Plugging Water Zones section 10, with shutoff water outlet.Certainly, oil reservoir packing section 7 and water-yielding stratum packing section 8 also can arrange multiple according to actual needs, to meet water blockoff and the production requirement of the water outlet of cased hole completion multistage pressure break horizontal well multiple spot.Safety joint 4 and gauge tap 5 is serially connected with successively by oil pipe 1 between two Y441 type packers 3 of each oil reservoir packing section 7, gauge tap 5 enters in the oil pipe 1 of tubing string for the crude oil controlling oil layer section output, to pass through oil pipe 1 by Crude Oil Transportation to upper horizontal well, pumped to aboveground by flow string and oil well pump again, realize the production of oil layer section.Safety joint 4 is serially connected with by oil pipe 1 between two Y441 type packers 3 of each water-yielding stratum packing section 8, oil reservoir packing section 7 and water-yielding stratum packing section 8 are serially connected successively by oil pipe 1, and each oil pipe 1 is communicated with the supervisor forming whole mechanical water plugging pipe string successively.Certainly, also can form water-yielding stratum packing section 8 between the Y441 type packer 3 that Y445 type back-off packer 2 is adjacent, this water-yielding stratum packing section 8 is connected with safety joint 4.Down-hole casing space is divided into multiple airtight packing region by multiple Y441 type packer 3 by the present invention, corresponding to different oil layer sections 9 and multiple water exit interval 10, gauge tap 5 is utilized to control the oil pipe of oil reservoir packing section and being communicated with or closing of oil layer section 9, realize the effective shutoff of machinery of the multiple spot water outlet of multistage pressure break horizontal well or arbitrfary point water outlet, and effective production of major oil reservoir section, reach the effect of water-control oil-increasing.
Further, the present invention adopts Y445 type back-off packer 2 to give up in net horizontal section by mechanical water plugging pipe string, mechanical water plugging pipe string is separated with the flow string 11 of the vertical section being arranged at horizontal well, effectively avoiding wriggles due to flow string 11 causes the phenomenon of net horizontal section water plugging string seal failure, effectively improves the period of validity of water pack off.
Further, gauge tap 5 is ball-and-seat or sliding sleeve switch or time switch.Above-mentioned all kinds of gauge tap can be adopted respectively for multiple oil reservoir packing section 7.
The mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot of the present invention water outlet achieves the effective shutoff of machinery of the water outlet of horizontal well multiple spot or arbitrfary point water outlet, reaches water-control oil-increasing, improves horizontal well ultimate recovery and development effectiveness.
Present invention also offers a kind of shutoff method, adopt the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot as above water outlet.This shutoff method comprises the following steps:
By mechanical water plugging pipe string down to horizontal well desired location;
Suppress and set Y441 type packer 3, Y445 type back-off packer 2, make at least one oil reservoir packing section 7 and at least one water-yielding stratum packing section 8 of forming sealing in sleeve pipe 12;
Open gauge tap 5, oil layer section 9 is connected with the oil pipe of oil reservoir packing section 7, realizes the production of oil layer section.
Because the water exit interval 10 of correspondence does not arrange gauge tap 5, and by the shutoff of water-yielding stratum packing section 8, oil layer section 9 makes oil pipe 1 inside be communicated with oil layer section 9 by gauge tap 5, realizes water-control oil-increasing, reaches the object of well development effect of improving the standard.
Further, if gauge tap 5 adopts ball-and-seat, after suppressing and setting Y441 type packer 3, Y445 type back-off packer 2, continue to suppress Y445 type back-off packer 2, ball-and-seat in process of production is automatically opened under differential pressure action in oil layer section 9 with oil pipe 1, realizes the production of oil layer section.The structure of ball-and-seat and operating principle are prior art, are not described in detail at this.
Further, if gauge tap 5 adopts sliding sleeve switch, after suppressing and setting Y441 type packer 3, Y445 type back-off packer 2, continue to suppress Y445 type back-off packer 2, then in oil pipe 1, the spheroid (can by sphere diameter order from small to large throw in) corresponding with sliding sleeve switch is dropped into one by one, open the sliding sleeve switch of oil layer section 9 one by one, realize the production of oil layer section.The structure of sliding sleeve switch and operating principle are prior art, are not described in detail at this.
Further, if gauge tap 5 adopts time switch, by mechanical water plugging pipe string down to before desired location, open or close acquisition time first at ground setting time switch; Suppress set Y441 type packer 3, Y445 type back-off packer time 2, time switch is closed condition; Suppress set Y441 type packer 3, after Y445 type back-off packer 2 completes, time switch is converted to open mode, is communicated with oil layer section 9 and the oil pipe of oil reservoir packing section 7, realizes the production of oil layer section.The structure of time switch and operating principle are prior art, are not described in detail at this.
As shown in Figure 1, the concrete structure of the embodiment of the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot of the present invention water outlet is: first blowout point 21, specking 23, specking 25 3 water outlets, water plugging string is connected the lower end of Y441 type packer 3 by oil pipe 1 by the upper end of plug 6, the upper end of Y441 type packer 3 connects the lower end of safety joint 4 by oil pipe 1, the lower end of oil pipe 1 connection control switch 5 is passed through in the upper end of safety joint 4, the upper end of gauge tap 5 connects the lower end of Y441 type packer 3 by oil pipe 1, the upper end of Y441 type packer 3 connects the lower end of safety joint 4 by oil pipe 1, the upper end of safety joint 4 connects the lower end of Y441 type packer 3 by oil pipe 1, the upper end of Y441 type packer 3 connects the lower end of safety joint 4 by oil pipe 1, the lower end of oil pipe 1 connection control switch 5 is passed through in the upper end of safety joint 4, the upper end of gauge tap 5 connects the lower end of Y441 type packer 3 by oil pipe 1, the upper end of Y441 type packer 3 connects the lower end of safety joint 4 by oil pipe 1, the upper end of safety joint 4 connects the lower end of Y445 type back-off packer 2 by oil pipe 1.
As shown in Figure 2, be the structural representation of another embodiment of the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot of the present invention water outlet.Its concrete structure is: second mouthful of blowout point 22, specking 24 two water outlets, water plugging string passes through the lower end of oil pipe 1 connection control switch 5 by the upper end of plug 6, the upper end of gauge tap 5 connects the lower end of Y441 type packer 3 by oil pipe 1, the upper end of Y441 type packer 3 connects the lower end of safety joint 4 by oil pipe 1, the upper end of safety joint 4 connects the lower end of Y441 type packer 3 by oil pipe 1, the upper end of Y441 type packer 3 connects the lower end of safety joint 4 by oil pipe 1, the lower end of oil pipe 1 connection control switch 5 is passed through in the upper end of safety joint 4, the upper end of gauge tap 5 connects the lower end of Y441 type packer 3 by oil pipe 1, the upper end of Y441 type packer 3 connects the lower end of safety joint 4 by oil pipe 1, the upper end of safety joint 4 connects the lower end of Y445 type back-off packer 2 by oil pipe 1.
Concrete shutoff method: be described for ball-and-seat.
As shown in Figure 1, first blowout point 21, specking 23, specking 25 3 water outlets: first by design scheme, water plugging string kit is connected, then behind precalculated position, with cement high delay unloading suppress in tubing string set Y441 type packer 3, Y445 type back-off packer 2 from oil pipe after, continue to suppress Y445 type back-off packer 2 of giving up; Then descend flow string 11 to produce, water exit interval is by the shutoff of Y441 type packer sealing, and the ball-and-seat of oil layer section is opened under pressure reduction in oil reservoir and oil pipe, realizes the production of oil-producing interval, reaches the object of water-control oil-increasing.
As shown in Figure 2, first water plugging string kit connects by design scheme by second mouthful of blowout point 22, specking 24 two water outlets, then behind precalculated position, with cement high delay unloading suppress in tubing string set Y441 type packer 3, Y445 type back-off packer 2 from oil pipe after, continue to suppress Y445 type back-off packer 2 of giving up; Then descend flow string 11 to produce, water exit interval is by Y441 type packer 3 sealing blocking, and the ball-and-seat of oil layer section is opened under pressure reduction in oil reservoir and oil pipe, realizes the production of oil-producing interval, reaches the object of water-control oil-increasing.
For the detailed explanation of the respective embodiments described above, its object is only to make an explanation to the present invention, so that the present invention can be understood better, but, it is limitation of the present invention that these descriptions can not become with any explanation, particularly, each feature described in various embodiments also can be combined mutually, thus form other embodiments, except there being clearly contrary description, these features should be understood to can be applied in any one embodiment, and are also not only confined to described embodiment.
Claims (7)
1. a mechanical water plugging pipe string for cased hole completion multistage pressure break horizontal well multiple spot water outlet, it is characterized in that, described mechanical water plugging pipe string comprises:
Plug and Y445 type back-off packer, be arranged at end and the front end of mechanical water plugging pipe string respectively;
At least three Y441 type packers, be arranged at intervals between described plug and described Y445 type back-off packer, and between Y441 type packer adjacent between two and the inwall of horizontal well casing pipe, form at least one oil reservoir packing section and at least one water-yielding stratum packing section of sealing;
Safety joint and gauge tap is serially connected with successively by oil pipe between two Y441 type packers of each described oil reservoir packing section, between two Y441 type packers of each described water-yielding stratum packing section, be connected to safety joint by oil pipe string, described oil reservoir packing section is connected in series by oil pipe with described water-yielding stratum packing section; Safety joint is provided with between the Y441 type packer that described Y445 type back-off packer is adjacent;
Described gauge tap is ball-and-seat or sliding sleeve switch or time switch.
2. the mechanical water plugging pipe string of cased hole completion multistage pressure break horizontal well multiple spot water outlet as claimed in claim 1, it is characterized in that, described mechanical water plugging pipe string is arranged at the horizontal segment of horizontal well, and described mechanical water plugging pipe string is separated with the flow string of the vertical section being arranged at horizontal well.
3. a shutoff method, adopt the mechanical water plugging pipe string of the cased hole completion multistage pressure break horizontal well multiple spot water outlet according to any one of claim 1 to 2, described shutoff method is by suppressing Y441 type packer, Y445 type back-off packer, down-hole casing space is divided into multiple packing region, realizes the water pack off of multistage pressure break horizontal well multiple spot water outlet.
4. shutoff method as claimed in claim 3, it is characterized in that, described shutoff method comprises:
By mechanical water plugging pipe string down to horizontal well desired location;
Suppress and set Y441 type packer, Y445 type back-off packer, make at least one oil reservoir packing section and at least one water-yielding stratum packing section of forming sealing in sleeve pipe;
Open gauge tap, oil layer section is connected with the oil pipe of oil reservoir packing section, realizes the production of oil layer section.
5. shutoff method as claimed in claim 4, it is characterized in that, described gauge tap is ball-and-seat,
Described suppress set Y441 type packer, Y445 type back-off packer after, continue to suppress Y445 type back-off packer, described ball-and-seat in process of production automatically opened under differential pressure action in oil layer section and oil pipe, realizes the production of oil layer section.
6. shutoff method as claimed in claim 4, it is characterized in that, described gauge tap is sliding sleeve switch,
Described suppress set Y441 type packer, Y445 type back-off packer after, continue to suppress Y445 type back-off packer, then in oil pipe, drop into the spheroid corresponding with sliding sleeve switch one by one, open the sliding sleeve switch of oil layer section one by one, realize the production of oil layer section.
7. shutoff method as claimed in claim 4, it is characterized in that, described gauge tap is time switch,
Described by mechanical water plugging pipe string down to before desired location, open or close acquisition time first at ground setting time switch;
Suppress set Y441 type packer, Y445 type back-off packer time, time switch is closed condition;
Suppress set Y441 type packer, after Y445 type back-off packer completes, time switch is converted to open mode, is communicated with the oil pipe of oil layer section and oil reservoir packing section, realizes the production of oil layer section.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210265361.XA CN102808584B (en) | 2012-07-27 | 2012-07-27 | Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method |
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| CN201210265361.XA CN102808584B (en) | 2012-07-27 | 2012-07-27 | Mechanical water plugging pipe column for multi-point discharge of cased hole completion multi-section fractured horizontal well and method |
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| CN102808584A CN102808584A (en) | 2012-12-05 |
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