CN209799937U - Separate-layer water injection device of casing damage repair well - Google Patents
Separate-layer water injection device of casing damage repair well Download PDFInfo
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- CN209799937U CN209799937U CN201920339885.6U CN201920339885U CN209799937U CN 209799937 U CN209799937 U CN 209799937U CN 201920339885 U CN201920339885 U CN 201920339885U CN 209799937 U CN209799937 U CN 209799937U
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Abstract
The utility model relates to a separate layer water injection device of cover decreases repair well, hang in big sheathed tube inner wall through the sleeve hanger in the upper end of small casing pipe, the water injection tubular column has been pegged graft to the small casing inner chamber, the top that stretches out the small casing pipe on the water injection tubular column and be connected with the big diameter section of tubular column through reducing joint, the big diameter section of tubular column passes through the water conservancy anchor to be fixed at big sheathed tube inner chamber, the position corresponding with the oil reservoir on the water injection tubular column is equipped with concentric water injection mandrel respectively, be equipped with small casing pipe packer and centralizer between the adjacent concentric water injection mandrel respectively, the concentric water injection mandrel below of bottom oil reservoir has connected gradually the check valve, screen pipe and plug. The periphery of the lower part of a central pipe of the small casing packer is sleeved with an expansion rubber cylinder, and a sliding sleeve switching mechanism, a backwashing deblocking mechanism and an internal pressure backwashing two-balance mechanism are sequentially arranged above the expansion rubber cylinder. The packer can repeatedly set the annular space of the sleeve of the small sleeve water injection well, can carry out backwashing, has two deblocking modes of backwashing deblocking and lifting deblocking, and is convenient to select during use.
Description
Technical Field
The utility model relates to a layering water injection device especially relates to a layering water injection device of cover decreases repair well, belongs to layering water injection facility technical field.
Background
The packer is an important tool for sealing off oil layers in a casing, and its main sealing element is an expansion rubber sleeve. The expansion rubber cylinder expands to seal the oil sleeve annulus and separate the upper oil layer from the lower oil layer through the action of water power, machinery or self-sealing, thereby achieving a certain construction purpose. Separate-layer water injection is an important means for maintaining stratum pressure, solving the contradiction among layers, in layers and on planes and prolonging the high and stable yield of an oil field, and a packer is a key tool for realizing separate-layer water injection. The Y341-114 deep well water injection packer is mainly used for construction of zonal water injection, water plugging, water exploration and the like, in particular to high-temperature and high-pressure zonal water injection of deep wells.
Along with the increase of the development age of an oil field, the deformation and casing damage of a casing are more and more, the production is recovered after side drilling and casing suspension repair are generally adopted, so that a new small casing is put into an original damaged large casing to form a small-diameter well hole, the small casing is suspended in the large casing through a hanger at the top, the outer diameter of the small casing is mainly phi 102mm and phi 95mm, and the water injection of the small well hole at the initial stage is generally carried out in a general water injection mode and cannot be subjected to separate layer water injection; partial small well hole interbedding contradiction is prominent and needs separate injection urgently after long-term water injection so as to improve the water drive effect. However, the related small well separate injection process is not yet matched, the small well separate injection process of the oil field in China is mainly researched for a sleeve pipe with the diameter of phi 102mm, the developed pipe column adopts a method of integrally designing a packer and a water distributor, a water distribution core is designed on a central pipe of the packer, the outer diameter of the packer is phi 80mm, the inner diameter of the packer is phi 30mm, the pipe column mainly comprises a centralizing hydraulic anchor, an integrated tool of the packer and the water distributor and a bottom check valve, and the small-diameter packer suitable for separate injection of a small well with the diameter of 95mm has no related research.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the problem that exists among the prior art, provide a layering water injection device of casing damage repair well, can seal the sleeve pipe annular space of separating little sleeve pipe water injection well, even the inside and outside pressure differential of tubular column disappears, the packer still can keep encapsulated situation.
In order to solve the technical problem, the utility model discloses a separate-zone water injection device of casing damage restoration well, the upper end of small casing hangs at the inner wall of big sleeve pipe through the sleeve hanger, the inner chamber of small casing is pegged graft and is had the water injection tubular column, the upper end of water injection tubular column stretches out the top of small casing and is connected with the big diameter section of tubular column through the reducer union, the big diameter section of tubular column is fixed at the inner chamber of big sleeve pipe through the hydraulic anchor, the position that corresponds with the oil reservoir on the water injection tubular column is equipped with concentric water injection mandrel respectively, is equipped with small casing packer and centralizer respectively between the adjacent concentric water injection mandrel, and the concentric water injection mandrel below the bottom oil reservoir connects gradually check valve, screen pipe and plug; the small casing packer comprises a central pipe, an expansion rubber sleeve is sleeved on the periphery of the lower part of the central pipe, the lower end of the expansion rubber sleeve is closed, and a gap is formed between the inner peripheral wall of the expansion rubber sleeve and the outer wall of the central pipe to form a rubber sleeve inner cavity; the upper end of the expansion rubber cylinder is fixed in the lower port of the upper pressure cap of the rubber cylinder, a spring is supported on an inner step in the middle of the upper pressure cap of the rubber cylinder, the upper end of the spring is pressed at the lower end of the backwashing piston, the upper end of the backwashing piston is abutted against the lower part of the backwashing piston seat, and the periphery of the lower part of the backwashing piston seat is spirally connected with the upper port of the upper pressure cap of the rubber cylinder; a setting water inlet hole is arranged on the central pipe corresponding to the inner wall of the backwashing piston seat.
Compared with the prior art, the utility model discloses following beneficial effect has been obtained: after the large casing is deformed and damaged, a new small casing is put into the original damaged large casing to form a small-diameter borehole, and the small casing is suspended in the large casing through a hanger at the top. After the upper and lower oil layers are separated by a special small casing packer in the small casing, the zonal water injection can be carried out. And pressurizing the packer from the inside of the central pipe, enabling hydraulic pressure to enter the inner cavity of the backwashing piston seat through the setting water inlet hole in the central pipe, pushing the backwashing piston to compress the spring, and enabling the hydraulic pressure to enter the inner cavity of the expansion rubber cylinder to expand the annular space of the sealing oil casing pipe to realize setting. When stopping annotating, under the tension effect of spring, the backwash piston upwards rises and the laminating of backwash piston seat, makes the pressure fluid of expansion packing element inner chamber sealed, guarantees that the expansion packing element is in the setting state, even the pressure differential inside and outside the tubular column disappears, the packer still can keep encapsulated situation, has solved conventional packer and has taken place the problem of deblocking promptly at oil pipe pressure release.
As an improvement of the utility model, the upper part of the backwashing piston seat is screwed with a switch hydraulic cylinder, the inner cavity of the switch hydraulic cylinder is provided with a switch piston, the lower end of the switch piston is provided with a switch piston small-diameter section, and the lower end of the switch piston small-diameter section is inserted into the inner cavity of the backwashing piston seat and is opposite to the inner edge of the upper end of the backwashing piston; and the small-diameter section of the switch piston is provided with a switch piston water trough communicated with the setting water inlet hole. When the packer is pressurized and set from the inside of the central pipe, the switch piston keeps the upward thrust of the switch hydraulic cylinder under the action of internal pressure, so that the switch hydraulic cylinder cannot generate axial displacement relative to the central pipe, and the packer is guaranteed against failure due to shearing of the packer deblocking shear pin due to creeping during water injection.
As a further improvement, the middle section of the switch hydraulic cylinder is provided with a switch piston inner step which is used for limiting, and the upper part of the switch hydraulic cylinder inner step is provided with a backwashing water inlet hole which is communicated with the switch hydraulic cylinder. When the switch piston is subjected to hydraulic pressure injected from the setting water inlet hole, the switch piston slides upwards to a step in the switch hydraulic cylinder to stop. When needing the backwash well, the oil jacket annular space pressurization, liquid gets into in the annular space between switch hydraulic cylinder and the center tube through the backwash inlet opening on the switch hydraulic cylinder, liquid promotes the switch piston downstream, the small diameter section of switch piston pushes away the backwash piston downwards, liquid in the expansion packing element passes through the backwash piston, sit the seal inlet opening on the center tube, get back to the water injection tubular column, the packer deblocking, can carry out the backwash well, balanced piston keeps balanced hydraulic cylinder ascending thrust simultaneously, the piston power of most effect on the expansion packing element is decurrent has been offset, the decurrent shearing force that balanced hydraulic cylinder top deblocking shear pin received has been reduced, the packer can not make the deblocking shear pin cut off and become invalid because of the decurrent piston power of expansion packing element when backwash well. When water is injected again, liquid in the central pipe pushes the switch piston to move upwards through the setting water inlet hole in the central pipe, and meanwhile, the backwashing piston is pushed to open so that the packer is set.
As a further improvement, the last end of switch hydraulic cylinder has connect balanced hydraulic cylinder soon, the inner chamber of balanced hydraulic cylinder is equipped with balanced piston, the middle section of balanced hydraulic cylinder is equipped with carries out upper limit balanced hydraulic cylinder inner step to balanced piston, the last port of balanced hydraulic cylinder supports to lean on the step below at the top connection, and the lower extreme periphery at the top connection is passed through the deblocking shear pin to the upper portion circumference of balanced hydraulic cylinder, the lower extreme box thread of top connection connects soon the upper end of center tube, be equipped with the center tube outlet on the center tube of balanced piston top. Because the upper port of the balance hydraulic cylinder abuts against the lower part of the step of the upper joint, the balance hydraulic cylinder can be pushed upwards to ensure that the deblocking shear pin is not sheared. When the deblocking and pipe string lifting operation are needed, two deblocking methods are available: the first is the deblocking of the backwashing well, which has the same operation principle as the backwashing well; and the other method is to lift the pipe column for deblocking, when the pipe column is lifted, the balance hydraulic cylinder keeps still under the action of friction force between the expansion rubber sleeve and the sleeve, the upper joint and the central pipe move upwards, and deblocking shear pins are cut off to realize deblocking.
As a further improvement, the lower extreme of expansion packing element is fixed under the packing element and is pressed in the cap, the lower extreme inner wall that the cap was pressed under the packing element realizes sealedly through O shape circle and central tube outer wall, the center tube that the cap below was pressed under the packing element is equipped with the central tube reducing section, the lower extreme of central tube reducing section has connect the lower clutch soon. After the deblocking shear pin is cut off, the central tube continues to move upwards, the O-shaped ring in the rubber sleeve downward pressing cap passes through the lower step of the central tube and loses the sealing effect, the inner cavity of the rubber sleeve is expanded to release pressure, the internal pressure and the external pressure are balanced, the deblocking is realized, and the packer can be smoothly played.
As a further improvement of the utility model, the interior latus rectum of center tube is phi 40mm, be equipped with on the middle part circumference of the rubber tube lower pressure cap and press the cap outlet, it has connect sealing screw soon to press the cap outlet. The requirements of layered water distribution and water absorption profile testing of an instrument with the diameter phi of 36mm can be met, the sealing screw seals the pressure cap water release hole, the packer can be subjected to pressure testing, and the sealing screw is screwed off to be released after the pressure testing is finished.
As a further improvement of the utility model, the upper end of the backwashing piston and the hypomere of the backwashing piston seat are mutually matched through the oblique conical surface, and the sealing ring is embedded on the oblique conical surface of the backwashing piston. The inclined conical surface can increase the matching area of the backwashing piston and the backwashing piston seat, has the function of automatic centering, and can improve the sealing performance by embedding the sealing ring on the inclined conical surface of the backwashing piston.
As a further improvement, the inner periphery of the upper end of the backwashing piston is embedded with a pressure ring relative to the lower edge of the small-diameter section of the switch piston, and the middle periphery of the pressure ring is provided with a step to press the sealing ring. When the seat is sealed, the lower end of the switch piston pushes the backwashing piston to move downwards through the compression ring, the processing difficulty of the backwashing piston can be reduced, the service life of the backwashing piston is prolonged, and the installation and the replacement of the sealing ring are facilitated.
As a further improvement of the utility model, the external diameter of the small casing packer is phi 75 mm. Can meet the repeated setting requirement of a phi 95mm small casing water injection well.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration purposes only and are not intended to limit the invention.
Figure 1 is the utility model discloses the layering water injection device's of casing damage repair well schematic diagram.
FIG. 2 is a front view of the small casing packer of FIG. 1.
Fig. 3 is an enlarged view of fig. 2.
Fig. 4 is a partially enlarged view of fig. 2.
In the figure: A. a hydraulic anchor; B. a concentric water distributor; C. a small casing packer; D. a centralizer; E. a one-way valve; F. a screen pipe; G. plugging with a thread; H. a casing hanger; 1. an upper joint; 2. unsealing the shear pins; 3. a balancing hydraulic cylinder; 4. a balance piston; 5. a central tube; 5a, setting a water inlet; 5b, central pipe drainage holes; 5c, reducing the diameter of the central pipe; 6. opening and closing the hydraulic cylinder; 6a, backwashing water inlets; 7. a switch piston; 7a, switching a small-diameter section of the piston; 7b, opening and closing a piston water trough; 8. backwashing the piston seat; 9. a seal ring; 10. pressing a ring; 11. backwashing the piston; 12. a spring; 13. pressing a cap on the rubber cylinder; 14. expanding the rubber cylinder; 15. pressing the cap down by the rubber cylinder; 16. a seal screw; an O-ring; 18. and a lower joint.
Detailed Description
As shown in fig. 1, the utility model discloses a separate layer water injection device of well is restoreed to casing damage, hang in big sheathed tube inner wall through sleeve hanger H in the upper end of small casing pipe, it has the water injection tubular column to peg graft in the inner chamber of small casing pipe, the upper end of water injection tubular column stretches out the top of small casing pipe and is connected with the big diameter section of tubular column through reducing joint, the big diameter section of tubular column is fixed at big sheathed tube inner chamber through water conservancy anchor A, the position corresponding with the oil reservoir on the water injection tubular column is equipped with concentric water injection mandrel B respectively, be equipped with small casing pipe packer C and centralizer D between the adjacent concentric water injection mandrel respectively, the concentric water injection mandrel B below of bottom oil reservoir has connected gradually check valve E, screen pipe F and plug G. After the upper and lower oil layers are separated by a small casing packer in the small casing, the zonal water injection can be carried out.
As shown in fig. 2 to 4, the small casing packer C includes a central pipe 5, an expansion rubber sleeve 14 is sleeved on the lower portion of the central pipe 5, the lower end of the expansion rubber sleeve 14 is closed, and a gap is formed between the inner circumferential wall of the expansion rubber sleeve 14 and the outer wall of the central pipe 5 to form a rubber sleeve inner cavity; the lower end of the central tube 5 is screwed with a lower joint 18. The upper end of an expansion rubber cylinder 14 is fixed in the lower port of an upper pressure cap 13 of the rubber cylinder, a spring 12 is supported on an inner step in the middle of the upper pressure cap 13 of the rubber cylinder, the upper end of the spring 12 is pressed at the lower end of a backwashing piston 11, the upper end of the backwashing piston 11 is propped against the lower part of a backwashing piston seat 8, and the periphery of the lower part of the backwashing piston seat 8 is spirally connected with the upper port of the upper pressure cap 13 of the rubber cylinder; a setting water inlet hole 5a is arranged on the central pipe 5 corresponding to the inner wall of the backwashing piston seat 8.
The upper part of the backwashing piston seat 8 is rotatably connected with a switch hydraulic cylinder 6, the inner cavity of the switch hydraulic cylinder 6 is provided with a switch piston 7, the lower end of the switch piston 7 is provided with a switch piston small-diameter section 7a, and the lower end of the switch piston small-diameter section 7a is inserted into the inner cavity of the backwashing piston seat 8 and is opposite to the inner edge of the upper end of the backwashing piston 11; the small diameter section 7a of the switch piston is provided with a switch piston water trough 7b communicated with the setting water inlet hole 5a.
The middle section of the switch hydraulic cylinder 6 is provided with a switch hydraulic cylinder inner step for limiting the switch piston 7 upwards, and a backwashing water inlet hole 6a penetrating through the switch hydraulic cylinder 6 is arranged above the switch hydraulic cylinder inner step.
The upper end of switch hydraulic cylinder 6 has connect balanced hydraulic cylinder 3 soon, the inner chamber of balanced hydraulic cylinder 3 is equipped with balanced piston 4, the middle section of balanced hydraulic cylinder 3 is equipped with carries out upper limit balanced hydraulic cylinder inner step to balanced piston 4, the last port of balanced hydraulic cylinder 3 supports and leans on the step below at upper joint 1, the lower extreme periphery at upper joint 1 is connected through deblocking shear pin 2 to the upper portion circumference of balanced hydraulic cylinder 3, the lower extreme female screw of upper joint 1 connects in the upper end of center tube 5 soon, be equipped with center tube outlet 5b on the center tube 5 of balanced piston 4 top. The lower end of the expansion rubber cylinder 14 is fixed in a rubber cylinder lower pressing cap 15, the inner wall of the lower end of the rubber cylinder lower pressing cap 15 is sealed with the outer wall of the central tube 5 through an O-shaped ring 17, and the central tube 5 below the rubber cylinder lower pressing cap 15 is provided with a central tube reducing section 5c.
The packer is pressurized from the inside of the central pipe 5, hydraulic pressure enters the inner cavity of the backwashing piston seat 8 through the setting water inlet hole 5a on the central pipe 5, the backwashing piston 11 is pushed to compress the spring 12, and the hydraulic pressure enters the inner cavity of the expansion rubber cylinder 14 to expand the annular space of the sealing oil casing, so that setting is realized. When stopping annotating, under the tension effect of spring 12, backwash piston 11 rises upwards and laminates with backwash piston seat 8, makes the pressure fluid of expansion packing element 14 inner chamber sealed, guarantees that expansion packing element 14 is in the setting state, even the pressure differential between the inside and outside of tubular column disappears, the packer still can keep encapsulated situation, has solved conventional packer and has taken place the problem of deblocking promptly in oil pipe pressure release. When the packer is pressurized and set from the inside of the central pipe 5, the switch piston 7 keeps the upward thrust of the switch hydraulic cylinder 6 under the action of internal pressure, so that the switch hydraulic cylinder 6 cannot generate axial displacement relative to the central pipe 5, and the packer is prevented from being damaged due to shearing of the packer deblocking shear pin 2 due to creeping during water injection. When the switch piston 7 receives the hydraulic pressure injected from the setting water inlet hole 5a, the switch piston slides upwards to a step in the switch hydraulic cylinder to stop.
When a reverse well is needed, the oil sleeve annulus is pressurized, liquid enters the annulus between the switch hydraulic cylinder 6 and the central pipe 5 through the backwashing water inlet hole 6a on the switch hydraulic cylinder 6, the liquid pushes the switch piston 7 to move downwards, the small-diameter section 7a of the switch piston pushes the backwashing piston 11 downwards, the liquid in the expansion rubber cylinder 14 returns to the water injection pipe column through the backwashing piston 11 and the setting water inlet hole 5a on the central pipe 5, the packer is unsealed, reverse well washing can be conducted, meanwhile, the balance piston 4 keeps upward thrust of the balance hydraulic cylinder 3, most of downward piston force acting on the expansion rubber cylinder 14 is offset, downward shearing force borne by the unsetting nail 2 above the balance hydraulic cylinder 3 is reduced, and the packer cannot shear the unsetting nail 2 to fail due to the downward piston force of the expansion rubber cylinder 14 during reverse well washing. When water is refilled, liquid in the central pipe 5 pushes the switch piston 7 to move upwards through the setting water inlet hole 5a on the central pipe 5, and meanwhile, the backwashing piston 11 is pushed to be opened, so that the packer is set again.
Because the last port of balanced hydraulic cylinder 3 supports and leans on below the step of top connection 1, balanced hydraulic cylinder 3 receives upward thrust can ensure that deblocking shear pin 2 is not sheared. When the deblocking and pipe string lifting operation are needed, two deblocking methods are available: the first is the deblocking of the backwashing well, which has the same operation principle as the backwashing well; the other is to lift the pipe column for deblocking, when the pipe column is lifted, the balance hydraulic cylinder 3 keeps still under the action of the friction force between the expansion rubber sleeve 14 and the casing, the upper joint 1 and the central pipe 5 move upwards, and the deblocking shear pin 2 is sheared; the central tube 5 continues to move upwards, the O-shaped ring 17 in the rubber sleeve lower pressing cap 15 downwards crosses the lower step of the central tube 5 to lose the sealing effect, the inner cavity of the rubber sleeve 14 is expanded to release pressure, the internal pressure and the external pressure are balanced, the deblocking is realized, and the packer can be smoothly played.
The middle circumference of the rubber cylinder lower pressing cap 15 is provided with a pressing cap drainage hole, and the pressing cap drainage hole is screwed with a sealing screw 16. The sealing screw 16 seals the pressure cap drain hole, pressure testing can be carried out on the packer, and the sealing screw 16 is screwed off to be released after the pressure testing is finished.
The upper end of the backwashing piston 11 is matched with the lower section of the backwashing piston seat 8 through an inclined conical surface, and the inclined conical surface of the backwashing piston 11 is embedded with a sealing ring 9. And a pressing ring 10 opposite to the lower edge of the small-diameter section 7a of the switch piston is embedded in the inner periphery of the upper end of the backwashing piston 11, and a step is arranged on the outer periphery of the middle part of the pressing ring 10 to press the sealing ring 9. The inclined conical surface can increase the matching area of the backwashing piston 11 and the backwashing piston seat 8, and has the function of automatic centering, and the sealing performance can be improved by embedding the sealing ring 9 on the inclined conical surface of the backwashing piston 11. When the seat is sealed, the lower end of the switch piston 7 pushes the backwashing piston 11 to move downwards through the pressing ring 10, so that the processing difficulty of the backwashing piston 11 can be reduced, the service life of the backwashing piston is prolonged, and the installation and the replacement of the sealing ring 9 are facilitated.
The utility model discloses a packer is equipped with sliding sleeve on-off mechanism, and after oil pipe pressure release, the sliding sleeve switch keeps closing, and the expansion packing element 14 inside and outside does not communicate with each other, guarantees that the packer still can keep encapsulated situation when water injection pressure fluctuation and shut-in stop-injection, has solved the problem of interbedded channeling. Still be equipped with backwash deblocking mechanism, can guarantee that the packer reaches a timing at backwash pressure differential, the packer deblocking carries out the backwash well operation, after the backwash, gives the packer water injection again, and the packer can set up again. Still be equipped with two balance mechanism of interior pressure, backwash, the packer can not make packer deblocking shear pin 2 cut and become invalid because of the wriggling of packer when the water injection, can not make deblocking shear pin 2 cut and become invalid because of the piston power of going up the decurrent on the packing element when backwashing, and the stability of packer strengthens greatly. Two deblocking modes of backwashing deblocking and lifting deblocking are provided, so that selection is convenient to perform according to actual conditions during use.
The outer diameters of the balance hydraulic cylinder 3, the switch hydraulic cylinder 6, the rubber cylinder upper pressure cap 13 and the rubber cylinder lower pressure cap 15 are phi 75mm, and the repeated setting requirement of a phi 95mm small casing water injection well can be met; the inner diameter of the central tube 5 is phi 40mm, which can meet the requirements of the test of water distribution and water absorption profiles by layer for instruments with the diameter of phi 36 mm.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All the technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope claimed by the present invention. The undescribed technical features of the present invention can be realized by or using the prior art, and are not described herein again.
Claims (9)
1. The utility model provides a separate layer water injection device of cover decreases repair well, the upper end of little sheathed tube hangs at big sheathed tube inner wall through the casing hanger, it has the water injection tubular column to peg graft in little sheathed tube inner chamber, the upper end of water injection tubular column stretches out little sheathed tube top and is connected with the big diameter section of tubular column through reducer union, the big diameter section of tubular column is fixed at big sheathed tube inner chamber, its characterized in that through the hydraulic anchor: concentric water distributors are respectively arranged at positions corresponding to the oil layer on the water injection pipe column, a small sleeve packer and a centralizer are respectively arranged between the adjacent concentric water distributors, and a check valve, a sieve pipe and a plug are sequentially connected below the concentric water distributors of the bottom oil layer; the small casing packer comprises a central pipe, an expansion rubber sleeve is sleeved on the periphery of the lower part of the central pipe, the lower end of the expansion rubber sleeve is closed, and a gap is formed between the inner peripheral wall of the expansion rubber sleeve and the outer wall of the central pipe to form a rubber sleeve inner cavity; the upper end of the expansion rubber cylinder is fixed in the lower port of the upper pressure cap of the rubber cylinder, a spring is supported on an inner step in the middle of the upper pressure cap of the rubber cylinder, the upper end of the spring is pressed at the lower end of the backwashing piston, the upper end of the backwashing piston is abutted against the lower part of the backwashing piston seat, and the periphery of the lower part of the backwashing piston seat is spirally connected with the upper port of the upper pressure cap of the rubber cylinder; a setting water inlet hole is arranged on the central pipe corresponding to the inner wall of the backwashing piston seat.
2. The zonal injection apparatus of a casing damage repair well according to claim 1, wherein: the upper part of the backwashing piston seat is rotatably connected with a switch hydraulic cylinder, a switch piston is arranged in an inner cavity of the switch hydraulic cylinder, a small-diameter section of the switch piston is arranged at the lower end of the switch piston, and the lower end of the small-diameter section of the switch piston is inserted into the inner cavity of the backwashing piston seat and is opposite to the inner edge of the upper end of the backwashing piston; and the small-diameter section of the switch piston is provided with a switch piston water trough communicated with the setting water inlet hole.
3. The zonal injection apparatus of a casing damage repair well according to claim 2, wherein: the middle section of the switch hydraulic cylinder is provided with a switch hydraulic cylinder inner step for limiting the switch piston upwards, and a backwashing water inlet hole penetrating through the switch hydraulic cylinder is arranged above the switch hydraulic cylinder inner step.
4. The zonal injection apparatus of a casing damage repair well according to claim 3, wherein: the upper end of switch hydraulic cylinder has connect balanced hydraulic cylinder soon, the inner chamber of balanced hydraulic cylinder is equipped with balanced piston, the middle section of balanced hydraulic cylinder is equipped with carries out upper limit's balanced hydraulic cylinder inner step to balanced piston, the last port of balanced hydraulic cylinder supports and leans on the step below at the top connection, and the lower extreme periphery at the top connection is passed through to the upper portion circumference of balanced hydraulic cylinder through the deblocking shear pin, the lower extreme box thread of top connection connects soon the upper end of center tube, be equipped with the center tube outlet on the center tube of balanced piston top.
5. The zonal injection apparatus of a casing damage repair well according to claim 4, wherein: the lower end of the expansion rubber cylinder is fixed in a rubber cylinder lower pressing cap, the inner wall of the lower end of the rubber cylinder lower pressing cap is sealed with the outer wall of the central tube through an O-shaped ring, a central tube under the rubber cylinder lower pressing cap is provided with a central tube reducing section, and the lower end of the central tube reducing section is screwed with a lower joint.
6. The zonal injection apparatus of a casing damage repair well according to claim 5, wherein: the inner diameter of the central tube is phi 40mm, a cap-pressing water outlet is arranged on the circumference of the middle part of the lower pressing cap of the rubber cylinder, and the cap-pressing water outlet is screwed with a sealing screw.
7. The zonal injection apparatus of a casing damage repair well according to claim 2, wherein: the upper end of the backwashing piston is matched with the lower section of the backwashing piston seat through an inclined conical surface, and a sealing ring is embedded on the inclined conical surface of the backwashing piston.
8. The zonal injection apparatus of a casing damage repair well according to claim 7, wherein: and a pressing ring opposite to the lower edge of the small-diameter section of the switch piston is embedded in the inner periphery of the upper end of the backwashing piston, and a step is arranged on the outer periphery of the middle part of the pressing ring to press the sealing ring.
9. A zonal injection apparatus for a casing damage repair well according to any of claims 1 to 8, wherein: the outer diameter of the small casing packer is phi 75 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920339885.6U CN209799937U (en) | 2019-03-18 | 2019-03-18 | Separate-layer water injection device of casing damage repair well |
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| CN201920339885.6U CN209799937U (en) | 2019-03-18 | 2019-03-18 | Separate-layer water injection device of casing damage repair well |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441738A (en) * | 2020-04-28 | 2020-07-24 | 大庆研科环保科技开发有限公司 | Packer around middle layer |
| CN112922581A (en) * | 2021-02-10 | 2021-06-08 | 巩建雨 | Wall-mounted type separating water-stopping capacity test device |
| CN114086910A (en) * | 2020-08-25 | 2022-02-25 | 中国石油天然气股份有限公司 | Double-unsealing packer for unsealing, lifting and unsealing during well washing |
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2019
- 2019-03-18 CN CN201920339885.6U patent/CN209799937U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111441738A (en) * | 2020-04-28 | 2020-07-24 | 大庆研科环保科技开发有限公司 | Packer around middle layer |
| CN111441738B (en) * | 2020-04-28 | 2024-05-24 | 大庆研科环保科技开发有限公司 | Packer around middle layer |
| CN114086910A (en) * | 2020-08-25 | 2022-02-25 | 中国石油天然气股份有限公司 | Double-unsealing packer for unsealing, lifting and unsealing during well washing |
| CN114086910B (en) * | 2020-08-25 | 2023-09-26 | 中国石油天然气股份有限公司 | Double-deblocking packer for lifting and deblocking during well flushing deblocking |
| CN112922581A (en) * | 2021-02-10 | 2021-06-08 | 巩建雨 | Wall-mounted type separating water-stopping capacity test device |
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