CN201090199Y

CN201090199Y - Two-level three-segment injection-divided tubular pile capable of preventing water injection segment from inverse-spraying and channelling

Info

Publication number: CN201090199Y
Application number: CNU2007201497303U
Authority: CN
Inventors: 刘扬
Original assignee: China Petroleum and Natural Gas Co Ltd
Current assignee: China Petroleum and Natural Gas Co Ltd
Priority date: 2007-06-20
Filing date: 2007-06-20
Publication date: 2008-07-23
Anticipated expiration: 2017-06-20

Abstract

Disclosed is a two-level three-section water flooding layer section anti-reversing and cross-flowing separate injection pipe string used for a water injection string, which comprises a first level anti-reversing eccentric water distributor (1), a first level non back washing well compression packer (2), etc., the first level non back washing well compression packer (2) is positioned between an upper water flooding layer section (11) and a middle water flooding layer section (12), and the first level non back washing well compression packer (2) is positioned between the first level anti-reversing eccentric water distributor (1) and the second level anti-reversing eccentric water distributor (3) in the meantime; a second level non back washing well compression packer (4) is positioned between the middle water flooding layer section (12) and a lower water flooding layer section (13), the second level non back washing well compression packer (4) is positioned between the second level anti-reversing eccentric water distributor (3) and a third level anti-reversing eccentric water distributor (6) in the meantime, thus the anti-reversing and cross-flowing phenomena of the injected water at the layer sections can be avoided effectively; the utility model has high success rate of pulling and running for water injection allocation and needs no well cleanup, and can reduce the labor intensity of workers; and the pipe string has strong adaptability to heavy oil wells, sand wells, profile modified separate injection wells and medium and shallow wells with rather low injection pressure and rather big layer section pressure difference, and the valid period for pipe string separate injection is long.

Description

Secondary prevents the anti-channelling separate injection tubing string of telling of water filling interval for three sections

Technical field

The utility model provides a kind of petroleum industry water injection string to prevent the anti-channelling separate injection tubing string of telling of water filling interval with three sections of secondarys.

Background technology

At present, each oil field uses eccentric separate layer water injection string very general in middle shallow well multilayered reservoir waterflooding extraction process, and proportion is more than 80%.The applied dispensing instrument of three sections eccentric separate injection tubing strings of secondary mainly contains eccentric injection mandrel, packer, support waterpower slips, two ball seat, screen casing, plug etc.During normal water filling, water filling can normally enter the stratum from oil pipe through eccentric injection mandrel, satisfies the dispensing needs.But, because the imperfection of eccentric separate injection tubing string setted structure, in case termination of pumping stops annotating, have following 3 aspect problems: 1. for most of open type eccentric injection mandrel, the water that injects the stratum will be by eccentric injection mandrel by anti-low water filling interval of channelling entrance pressure power or the ground main line told of the high water filling interval of pressure; 2. because the design of the dispensing packer of most of wells has the backwash passage, during normal water filling, oil pressure is greater than casing pressure, flushing valve is closed, after termination of pumping stops annotating, oil pressure is less than or equal to casing pressure, and flushing valve can be opened, and the water that injects the stratum also can be by the packer well-washing passage by anti-low water filling interval of channelling entrance pressure power or the ground main line told of the high water filling interval of pressure; 3. two ball seats are ball-and-seat, can not effectively stop the two-way flow of water.Because eccentric separate injection tubing string fails effectively to solve the anti-channelling problem of telling of separate injection interval, inject that water instead tells that channelling can cause not only pulling to survey to be made into that power is low, flushing valve card, ball-and-seat ball seat are not closed completely, formation sand production shortens the separate injection tubing string period of validity and workover treatment, but also damage stratum energy, reduce flood effectiveness, directly affect the raising of oil field oil recovery economic benefit.

Summary of the invention

The purpose of this utility model is to provide a kind of petroleum industry water injection string to prevent the anti-channelling separate injection tubing string of telling of water filling interval with three sections of secondarys, its make to inject water preventing that the anti-channelling separate injection tubing string of telling of interval can only way flow, can effectively avoid injecting water in the anti-generation of telling the channelling phenomenon of interval; Pulling is surveyed and is made into the power height, and does not need well-flushing, can alleviate working strength of workers; Tubing string for heavy oil wells, sand output well, profile control after dispensing well, water injection pressure is lower and interval pressure reduction is bigger middle shallow well compliance strong, tubing string dispensing period of validity is long.

The purpose of this utility model is achieved in that and comprises that the one-level counnter attack tells eccentric injection mandrel 1, one-level can not anti-flushing well compression packer 2, eccentric injection mandrel 3 is told in the secondary counnter attack, secondary can not anti-flushing well compression packer 4, support waterpower slips 5, eccentric injection mandrel 6 is told in three grades of counnter attacks, divide oil fuel tube 7, plug 8, sleeve pipe 9, last water filling interval 11, middle water filling interval 12, the water layer section 13 of making a bet, one-level can not place between water filling interval 11 and the water filling interval 12 by anti-flushing well compression packer 2, and one-level can not anti-flushing well compression packer 2 places the one-level counnter attack to tell eccentric injection mandrel 1 and the secondary counnter attack is told between the eccentric injection mandrel 3 simultaneously; Secondary can not anti-flushing well compression packer 4 places water filling interval 12 and makes a bet between the water layer section 13, secondary can not anti-flushing well compression packer 4 places the secondary counnter attack to tell eccentric injection mandrel 3 and three grades of counnter attacks are told between the eccentric injection mandrel 6 simultaneously, support waterpower slips 5 and be loaded on the bottom that secondary can not anti-flushing well compression packer 4, divide the bottom of oil fuel tube 7 that plug 8 is installed.

Divide and the one-level counnter attack to be housed respectively in the oil fuel tube 7 to tell that eccentric injection mandrel 1, secondary counnter attack are told eccentric injection mandrel 3, eccentric injection mandrel 6 is told in three grades of counnter attacks.

Advantage of the present utility model is: 1. inject water preventing that the anti-channelling separate injection tubing string of telling of interval can only way flow, can effectively avoid injecting water in the anti-generation of telling the channelling phenomenon of interval; 2. pulling is surveyed and is made into the power height, and does not need well-flushing, can alleviate working strength of workers; Tubing string for heavy oil wells, sand output well, profile control after dispensing well, water injection pressure is lower and interval pressure reduction is bigger middle shallow well compliance strong, tubing string dispensing period of validity is long.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

The specific embodiment

As shown in drawings, this device comprises that the one-level counnter attack tells eccentric injection mandrel 1, one-level can not anti-flushing well compression packer 2, eccentric injection mandrel 3 is told in the secondary counnter attack, secondary can not anti-flushing well compression packer 4, support waterpower slips 5, eccentric injection mandrel 6 is told in three grades of counnter attacks, divide oil fuel tube 7, plug 8, sleeve pipe 9, last water filling interval 11, middle water filling interval 12, the water layer section 13 of making a bet, one-level can not anti-flushing well compression packer 2 not only between last water filling interval 11 and middle water filling interval 12, and tell eccentric injection mandrel 1 and the secondary counnter attack is told between the eccentric injection mandrel 3 in the one-level counnter attack, the one-level counnter attack is told eccentric injection mandrel 1 and is given last water filling interval 11 water fillings, the secondary counnter attack is told eccentric injection mandrel 3 and is given middle water filling interval 12 water fillings, secondary can not anti-flushing well compression packer 4 not only at middle water filling interval 12 with make a bet between the water layer section 13, and tell eccentric injection mandrel 3 and three grades of counnter attacks are told between the eccentric injection mandrel 6 in the secondary counnter attack, three grades of counnter attacks are told eccentric injection mandrel 6 and are given water layer section 13 water fillings of making a bet, support waterpower slips 5 secondary can not anti-flushing well compression packer 4 the bottom, plug 8 is positioned at the bottommost of branch oil fuel tube 7.

Used eccentric injection mandrel is counnter attack and tells eccentric injection mandrel, used packer is can not the anti-flushing well compression packer, during normal water filling, water filling can only be told eccentric injection mandrel 1, secondary counnter attack from the one-level counnter attack minute oil fuel tube 7 tubing strings and be told eccentric injection mandrel 3, three grades of counnter attacks and tell eccentric injection mandrel 6 and flow into and divide the annular space that forms between oil fuel tubes 7 and the sleeve pipe 9, and the annular space that is formed by minute oil fuel tube 7 and sleeve pipe 9 enters water filling interval 11, middle water filling interval 12, the water layer section 13 of making a bet again.In case termination of pumping stops annotating, eccentric injection mandrel 1 is told in all one-level counnter attacks, eccentric injection mandrel 3 is told in the secondary counnter attack, eccentric injection mandrel 6 is told in three grades of counnter attacks, plug 8 can effectively stop the branch oil fuel tube 7 and the water of sleeve pipe 8 annular spaces to enter branch oil fuel tube 7, prevent water filling interval 11, middle water filling interval 12, the water layer section of making a bet 13 counter telling, all one-levels can not anti-flushing well compression packer 2, secondary can not the anti-flushing well compression packer 4 owing to there is not the well-flushing passage, one-level can not anti-flushing well compression packer 2, secondary can not anti-flushing well compression packer 4 sealing mechanism can be at last water filling interval 11, middle water filling interval 12, make a bet and play effective packing effect between the water layer section 13, prevent from that the water filling interval is counter to tell channelling.

Claims

1. secondary prevents the anti-channelling separate injection tubing string of telling of water filling interval for three sections, comprise that the one-level counnter attack tells eccentric injection mandrel (1), one-level can not anti-flushing well compression packer (2), eccentric injection mandrel (3) is told in the secondary counnter attack, secondary can not anti-flushing well compression packer (4), support waterpower slips (5), eccentric injection mandrel (6) is told in three grades of counnter attacks, divide oil fuel tube (7), plug (8), sleeve pipe (9), last water filling interval (11), middle water filling interval (12), the water layer section of making a bet (13), it is characterized in that: one-level can not place between water filling interval (11) and the water filling interval (12) by anti-flushing well compression packer (2), and one-level can not anti-flushing well compression packer (2) places the one-level counnter attack to tell eccentric injection mandrel (1) and the secondary counnter attack is told between the eccentric injection mandrel (3) simultaneously; Secondary can not anti-flushing well compression packer (4) places water filling interval (12) and makes a bet between the water layer section (13), secondary can not anti-flushing well compression packer (4) places the secondary counnter attack to tell eccentric injection mandrel (3) and three grades of counnter attacks are told between the eccentric injection mandrel (6) simultaneously, support waterpower slips (5) and be loaded on the bottom that secondary can not anti-flushing well compression packer (4), divide the bottom of oil fuel tube (7) that plug (8) is installed.

2. secondary according to claim 1 prevents the anti-channelling separate injection tubing string of telling of water filling interval for three sections, it is characterized in that: divide and the one-level counnter attack to be housed respectively in the oil fuel tube (7) to tell that eccentric injection mandrel (1), secondary counnter attack are told eccentric injection mandrel (3), eccentric injection mandrel (6) is told in three grades of counnter attacks.