Integrated water distribution packer for slim hole sidetracking well

Abstract

The slim-hole sidetracking well integrated water distribution packer comprises an upper connector, an inner center pipe, a lower center pipe, a locking connector and a lower connector which are sequentially connected, the lower end of a lower rubber sleeve base is sequentially connected with a setting mechanism and a shear pin sleeve, and the shear pin sleeve is connected with the periphery of the lower connector through a starting pin; an integrated water distribution core is arranged in the upper connector, a plurality of upper radial water outlet holes and a plurality of lower radial water outlet holes are formed in the integrated water distribution core, and the upper water outlet holes formed in the integrated water distribution core correspond to the radial upper-layer water distribution water outlets formed in the upper connector so that upper-layer water distribution can be achieved. And a lower water outlet hole formed in the integrated water distribution core is communicated with a water outlet hole formed in the upper joint, an annular space of the inner and outer central pipes, a water outlet formed in the lower end of the outer central pipe and a lower-layer water distribution outlet formed in the lower rubber sleeve seat, so that lower-layer water distribution is realized. The method is suitable for slim-hole sidetracking well separated layer water injection measures, two layers can be deployed in a one-time throwing-fishing mode, repeated throwing-fishing of the water distribution core is avoided, and the operation risk is reduced.

Description

Technical Field

[0001] The invention belongs to downhole tools for oilfield fields, and particularly relates to an integrated water distribution packer for slim-hole sidetracking wells. Background Art

[0002] After years of development in oilfields, the deformation and damage of casing pipes are increasing day by day. Using the old well to open a window for sidetracking to become an injection well can not only save a large amount of funds, but also supplement the formation energy through the injection well and improve the recovery rate. However, conventional string tools cannot be applied to sidetracking wells, and due to the small inner diameter of the casing pipe, the contradiction in tool design dimensions is prominent. The layered water injection measures for 4in sidetracking wells are affected by the existing string technology or cost constraints, which may cause under-injection in some layers, and even affect the change of the water injection structure in the entire block, intensify the interlayer contradiction, and is very unfavorable for the later production of the oilfield. In view of the above problems, the invention has developed a 4in integrated water distribution packer for sidetracking wells that integrates two-layer water distribution and a packer to reduce the string cost and simplify the operation procedure. Summary of the Invention

[0003] The purpose of the invention is to provide an integrated water distribution packer for slim-hole sidetracking wells, which is applicable to the layered water injection measures of slim-hole sidetracking wells, can perform one-time fishing and adjustment for two layers, avoid multiple fishing and adjustment of water distribution cores, and reduce the operation risk.

[0004] The invention is implemented as follows:

[0005] The invention provides an integrated water distribution packer for slim-hole sidetracking wells, which includes an upper joint, an inner central tube, a lower central tube, a locking joint and a lower joint connected in sequence. An outer central tube and a lower rubber cylinder seat are sleeved on the outer periphery of the inner central tube. A rubber cylinder assembly is sleeved outside the outer central tube. A setting mechanism, a locking mechanism and a releasing mechanism are designed at the lower part of the packer. A setting mechanism and a shear pin sleeve are connected in sequence at the lower end of the lower rubber cylinder seat. The shear pin sleeve is connected to the outer periphery of the lower joint through a starting pin; its characteristics are: an integrated water distribution core is arranged in the upper joint. A plurality of upper and lower radial water outlet holes are arranged on the integrated water distribution core, and the aperture sizes are designed according to the water distribution volume of the corresponding formation. The upper water outlet holes arranged on the integrated water distribution core correspond to the radial upper-layer water distribution outlet ports arranged on the upper joint to realize upper-layer water distribution. The lower water outlet holes arranged on the integrated water distribution core are communicated with the water outlet holes arranged on the upper joint, the annulus between the inner and outer central tubes, the water outlet port arranged at the lower end of the outer central tube and the lower-layer water distribution outlet port arranged on the lower rubber cylinder seat to realize lower-layer water distribution.

[0006] According to the above technical solution, the outer central tube is a stepped structure with a larger upper part and a smaller lower part. Its lower end is inserted between the rubber cylinder assembly and the inner central tube, and the lower end part is limited by the step arranged on the inner central tube.

[0007] According to the above technical solution, the upper end of the lower rubber cylinder seat is sleeved on the outer periphery of the lower end of the outer central tube, and the lower end is fixedly connected to the upper end of the upper outer sleeve by threads, and several lower-layer water distribution outlets are arranged in the middle of the lower rubber cylinder seat.

[0008] According to the above technical solution, the setting mechanism includes two-stage setting piston assemblies. The lower end of the inner central tube is connected to the lower central tube by threads. The two-stage setting pistons are respectively sleeved on the outer peripheries of the inner central tube and the lower central tube. Liquid inlet holes are correspondingly opened on the inner peripheries of the setting pistons corresponding to the inner central tube and the lower central tube. When the pressure in the tubing exceeds the set starting pressure value, the packer rubber cylinder can start to be compressed and set.

[0009] According to the above technical solution, the two-stage setting piston assemblies include an upper setting piston, an upper outer sleeve sleeved on the upper setting piston, a lower outer sleeve threadedly connected to the upper outer sleeve, and a lower setting piston arranged in the lower outer sleeve. The upper and lower ends of the lower setting piston are respectively positioned by the upper outer sleeve and the locking joint.

[0010] According to the above technical solution, the locking mechanism is installed below the setting mechanism and consists of a locking joint and a locking ring to prevent the compressed rubber cylinder assembly from rebounding and ensure the long-term sealing of the packer; external locking teeth are provided in the middle of the locking joint, and internal locking teeth capable of meshing with the external locking teeth of the locking joint are provided on the inner periphery of the locking ring. After the locking ring moves upward and meshes and locks, it cannot return, thus realizing locking.

[0011] According to the above technical solution, the releasing mechanism includes a releasing pin arranged on the lower outer sleeve of the setting mechanism and a support ring configured with the releasing pin. When the tubing is lifted to release the packer, the upper joint drives the inner central tube, the lower central tube, the locking joint and the locking ring meshed and locked with the locking joint to move upward together. The support ring is pushed upward by the locking ring until the releasing pin is sheared to realize the releasing of the packer.

[0012] According to the above technical solution, the lower end of the lower outer sleeve is threadedly connected to the upper end of the shear pin sleeve, and a setting piston, a locking joint, a support ring and a locking ring are sleeved inside. The support ring is fixed in the annular space between the lower outer sleeve and the locking joint by several releasing pins, and the locking ring is limited between the support ring and the shear pin sleeve.

[0013] According to the above technical solution, O-ring seals are installed on the upper joint, the integrated water distribution core, the setting piston, the lower central tube, the locking joint and the lower joint.

[0014] The beneficial effects of the present invention are as follows: Through the configured integrated water distribution core, several upper and lower radial water outlet holes are provided on the integrated water distribution core, and the aperture sizes thereof are designed according to the water distribution amounts of the corresponding formations. The upper water outlet holes provided on the integrated water distribution core correspond to the radial upper-layer water distribution outlet ports provided on the upper joint to achieve upper-layer water distribution. The lower water outlet holes provided on the integrated water distribution core are communicated with the water outlet holes provided on the upper joint, the annulus between the inner and outer central pipes, the water outlet provided at the lower end of the outer central pipe, and the lower-layer water distribution outlet port provided on the lower rubber cylinder seat to achieve lower-layer water distribution. Thus, the water distribution for the upper and lower two layers and the packer are integrated into one, and the two layers can be fished and adjusted at one time, avoiding fishing the water distribution core multiple times, reducing the cost of the pipe string, simplifying the operation procedure, and reducing the risk of fishing operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the setting core.

[0018] Wherein: 1. upper joint; 2. O-ring seal; 3. integrated water distribution core; 4. outer central pipe; 5. inner central pipe; 6. rubber cylinder assembly; 7. spacer ring; 8. lower rubber cylinder seat; 9. piston sleeve; 10. lower central pipe; 11. setting piston; 12. lower outer sleeve; 13. locking joint; 14. support ring; 15. releasing pin; 16. locking ring; 17. shear pin sleeve; 18. setting starting pin; 19. lower joint; a. upper water outlet hole a of the integrated water distribution core 3; b. lower water outlet hole b of the integrated water distribution core 3; c. water outlet hole c of the outer central pipe 4; d. liquid inlet hole d of the inner central pipe 5; e. liquid inlet hole e of the lower central pipe 10; f. upper-layer water distribution outlet port f; g. water outlet hole g of the upper joint 1; h. lower-layer water distribution outlet port h. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

[0022] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance.

[0023] In addition, terms such as "horizontal", "vertical", "overhanging", etc. do not mean that the components are required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0024] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] In the present invention, unless otherwise clearly specified and defined, the first feature being “above” or “below” the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being “above”, “over” and “on top of” the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being “below”, “beneath” and “underneath” the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0026] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0027] This embodiment provides a small borehole sidetracking well integrated water distribution packer, which includes an upper joint 1, an inner central tube 5, a lower central tube 10, a locking joint 13 and a lower joint 19 that are sequentially connected by threads. An outer central tube 4 and a lower rubber cylinder seat 8 are sleeved on the outer periphery of the inner central tube 5. A rubber cylinder assembly is sleeved outside the outer central tube 4. A setting mechanism, a locking mechanism and a releasing mechanism are designed at the lower part of the packer. The setting mechanism and a shear pin sleeve 17 are sequentially connected to the lower end of the lower rubber cylinder seat 8. The shear pin sleeve 17 is connected to the outer periphery of the lower joint 19 through a starting pin 18. An integrated water distribution core 3 is arranged inside the upper joint 1 and is limited by the cooperation of the step arranged inside the upper joint 1 and the step arranged on the outer periphery of the integrated water distribution core 3. The upper joint 1 and the integrated water distribution core 3 are sealed by an O-ring 2. Several radial upper-layer water distribution outlet holes f and several inclined water outlet holes g are arranged on the upper joint 1. Several upper water outlet holes a and several lower water outlet holes b are arranged on the integrated water distribution core 3. Their aperture sizes are designed according to the water distribution volume of the corresponding formation. The upper water outlet holes arranged on the integrated water distribution core correspond to the radial upper-layer water distribution outlet holes arranged on the upper joint to achieve upper-layer water distribution.

[0028] The lower water outlet holes b arranged on the integrated water distribution core are communicated with the water outlet holes g arranged on the upper joint, the annulus between the inner and outer central tubes, the water outlet c arranged at the lower end of the outer central tube and the lower-layer water distribution outlet hole h arranged on the lower rubber cylinder seat to achieve lower-layer water distribution.

[0029] The outer central tube 4 has a stepped structure with a larger upper part and a smaller lower part. Its lower end is inserted between the rubber cylinder assembly 6 and the inner central tube 5 and is limited by the step arranged on the inner central tube 5 at the lower end part.

[0030] The lower rubber cylinder seat 8 is placed below the rubber cylinder assembly 6 and is sleeved on the outer peripheries of the outer central tube 4 and the inner central tube 5. The lower end of the lower rubber cylinder seat 8 is fixedly connected to the upper end of the piston sleeve 9 by threads.

[0031] The upper end of the inner central tube 5 is threadedly connected to the lower end of the upper joint 1 and sealed by an O-ring 2. The lower end is threadedly connected to the upper end of the lower central tube 10 and sealed by an O-ring 2. Several radial liquid inlet holes d are provided above the lower end thread. The liquid inlet holes d correspond to a setting piston 11 sleeved on the outer periphery, and a piston sleeve 9 is sleeved on the outer periphery of the setting piston 11.

[0032] The lower end of the lower central tube 10 is threadedly connected to the upper end of the locking joint 13. Several radial liquid inlet holes e are provided above the lower end thread. The liquid inlet holes e correspond to a setting piston 11 sleeved on the outer periphery, and a lower outer sleeve 12 is sleeved on the outer periphery of the setting piston 11.

[0033] The lower end of the locking joint 13 is threadedly connected to the upper end of the lower joint 19 and sealed by an O-ring 2. Outer locking teeth are provided in the middle of the locking joint 13 and engaged with inner locking teeth provided on the inner periphery of the locking ring 16 for locking.

[0034] The upper end of the lower outer sleeve 12 is threadedly connected to the piston sleeve 9, and the lower end is threadedly connected to the shear pin sleeve 17. Several threaded holes are provided above the lower end thread for installing a releasing pin 15 and fixing a support ring 14.

[0035] Several round holes corresponding to the number of the releasing pins 15 are provided on the support ring 14 for shearing the releasing pins 15 when the packer needs to be released.

[0036] The locking ring 16 is sleeved in the annulus between the lower outer sleeve 12 and the locking joint 13 and axially limited between the support ring 14 and the shear pin sleeve 17.

[0037] The lower end of the shear pin sleeve 17 is connected to the lower joint 19 by several setting start pins 18 to control the packer to start setting at a set pressure.

[0038] The working process of the present invention is as follows:

[0039] Setting process: When the packer is lowered into the well along with the tubing string, the integrated water distribution core 3 in the packer is replaced with a setting core (the structure is as Figure 2 shown). After the tubing string is lowered in place, the tubing is pressured up. The liquid enters through the liquid inlet holes d of the inner central tube 5 and the liquid inlet holes e of the lower central tube 10 in the packer, causing the setting piston 11 to push the lower rubber cylinder seat 8, piston sleeve 9, lower outer sleeve 12, support ring 14, releasing pin 15, locking ring 16 and shear pin sleeve 17 to move upward. When the designed pressure is reached, the setting start shear pins 18 are sheared, and then the rubber cylinder assembly 6 is compressed. When the designed stroke is reached, the locking ring 16 is engaged with the locking joint 13 for locking, keeping the rubber cylinder assembly 6 in a compressed state, thus completing the setting.

[0040] Survey and adjustment process: After the packer is set, use a wire to lower a special fishing tool to fish out the setting core. Then, use a special tool to lower the integrated water distribution core 3 with a separately provided upper water outlet hole a or lower water outlet hole b to test the upper and lower water injection layers. After the test is completed, fish it out. Then, according to the test results of each layer, lower the integrated water distribution core 3 with the corresponding aperture for the water injection volume of the upper and lower layers, and normal water injection can be implemented.

[0041] Water injection process: During water injection, the upper layer water injection enters the formation through the upper water outlet hole a of the integrated water distribution core 3 and the upper layer water distribution port f provided on the upper joint 1; the lower layer water injection enters the formation through the lower water outlet hole b of the integrated water distribution core 3, the water outlet hole g provided on the upper joint 1, the annulus between the outer central tube 4 and the inner central tube 5, the water outlet hole c provided on the outer central tube 4, and the lower layer water distribution port h provided on the lower rubber cylinder seat 8.

[0042] Unsealing process: When the pipe string is lifted, the rubber cylinder assembly 6 is in a compressed and set state and is anchored on the casing wall. Together with the lower rubber cylinder seat 8, the piston sleeve 9, the lower outer sleeve 12, the support ring 14, the unsealing pin 15, and the shear pin sleeve 17, it remains stationary. The upper joint 1, the inner central tube 5, the lower central tube 10, the locking joint 13, and the lower joint 19 of the packer move upward simultaneously. During the upward movement, the lock ring 16 locked on the locking joint 13 pushes the support ring 14 upward until the unsealing pin 15 is sheared. The compressed rubber cylinder assembly 6 loses the limit lock and restores under its own elastic force, and the packer is unsealed.

[0043] The embodiments described above are some, but not all, of the embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. A small hole sidetracking well integrated water distribution packer, comprising an upper sub, an inner central tube, a lower central tube, a locking sub and a lower sub connected in sequence. An outer central tube and a lower rubber barrel seat are sleeved on the outer periphery of the inner central tube. A rubber barrel assembly is sleeved on the outer side of the outer central tube. A setting mechanism, a locking mechanism and a releasing mechanism are designed at the lower part of the packer. The setting mechanism and a shear pin sleeve are sequentially connected to the lower end of the lower rubber barrel seat. The shear pin sleeve is connected to the outer periphery of the lower sub through a starting pin; characterized in that: An integrated water distribution core is arranged inside the upper joint. Several upper and lower radial water outlet holes are provided on the integrated water distribution core. The upper water outlet holes provided on the integrated water distribution core correspond to the radial upper-layer water distribution outlet holes provided on the upper joint to achieve upper-layer water distribution. The lower water outlet holes provided on the integrated water distribution core are communicated with the water outlet holes provided on the upper joint, the annulus between the inner and outer central pipes, the water outlet provided at the lower end of the outer central pipe, and the lower-layer water distribution outlet holes provided on the lower rubber cylinder seat to achieve lower-layer water distribution.

2. The integrated water distribution packer for slim-hole sidetracking well according to claim 1, wherein, The outer central pipe has a stepped structure with a larger upper diameter and a smaller lower diameter. Its lower end is inserted between the rubber cylinder assembly and the inner central pipe, and the lower end is limited by the step provided on the inner central pipe.

3. The integrated water distribution packer for slim-hole sidetracking well according to claim 1 or 2, characterized in that, The upper end of the lower rubber cylinder seat is sleeved on the outer periphery of the lower end of the outer central pipe, and the lower end is fixedly connected to the upper end of the upper outer sleeve by threads. Several lower-layer water distribution outlet holes are provided in the middle of the lower rubber cylinder seat.

4. The integrated water distribution packer for slim-hole sidetracking well according to claim 1 or 2, characterized in that, The setting mechanism includes two-stage setting piston assemblies. A lower central pipe is connected to the lower end of the inner central pipe by threads. The two-stage setting pistons are respectively sleeved on the outer peripheries of the inner central pipe and the lower central pipe. Liquid inlet holes are correspondingly opened on the inner peripheries of the setting pistons corresponding to the inner central pipe and the lower central pipe. When the pressure in the tubing exceeds the set starting pressure value, the packer rubber cylinder can start to compress and set.

5. The integrated water distribution packer for slim-hole sidetracking well according to claim 4, wherein, The two-stage setting piston assemblies include an upper setting piston, an upper outer sleeve sleeved on the upper setting piston, a lower outer sleeve threadedly connected to the upper outer sleeve, and a lower setting piston provided inside the lower outer sleeve. The upper and lower ends of the lower setting piston are respectively positioned by the upper outer sleeve and the locking joint.

6. The integrated water distribution packer for slim-hole sidetracking well according to claim 2, wherein The locking mechanism is installed below the setting mechanism and consists of a locking joint and a locking ring. External locking teeth are provided in the middle of the locking joint, and internal locking teeth capable of meshing with the external locking teeth of the locking joint are provided on the inner periphery of the locking ring.

7. The integrated water distribution packer for slim-hole sidetracking well according to claim 6, wherein The releasing mechanism includes a releasing pin arranged on the lower outer sleeve and a support ring configured with the releasing pin.

8. The integrated water distribution packer for slim-hole sidetracking well according to claim 7, wherein, The lower end of the lower outer sleeve is threadedly connected to the upper end of the shear pin sleeve. A setting piston, a locking joint, a support ring, and a locking ring are sleeved inside the inner periphery. The support ring is fixed in the annulus between the lower outer sleeve and the locking joint by several releasing pins, and the locking ring is limited between the support ring and the shear pin sleeve.

9. The integrated water distribution packer for slim-hole sidetracking well according to claim 1 or 2, characterized in that, O-ring seals are installed on the upper joint, the integrated water distribution core, the setting piston, the lower central pipe, the locking joint, and the lower joint.

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