CN202810773U

CN202810773U - Balanced stage-by-stage unpacking washable well packer

Info

Publication number: CN202810773U
Application number: CN 201220555726
Authority: CN
Inventors: 王文龙
Original assignee: DAQING TAIZE MACHINERY PROCESSING Co Ltd
Current assignee: DAQING TAIZE MACHINERY PROCESSING Co Ltd
Priority date: 2012-10-28
Filing date: 2012-10-28
Publication date: 2013-03-20
Anticipated expiration: 2022-10-28

Abstract

Disclosed is a balanced stage-by-stage unpacking washable well packer. The well packer comprises an upper joint which is connected with an upper working barrel, and the upper working barrel is connected with a central pipe. An unpacking piston and a well washing piston are arranged in a cavity between the upper working barrel and the central pipe. A rubber ring pressing cap is connected to the lower end of the well washing piston. The upper end of the upper working barrel is connected with an unpacking sleeve which is connected with an unpacking hanger. A liner pipe is arranged on the outer wall of the central pipe, and two side rubber barrels and a middle rubber barrel are sleeved outside the liner pipe and partitioned through partition rings. A lower working barrel is connected with a lower joint through internal threads at the lower end. A lock ring hanger is arranged below the side rubber barrels and connected with the lower working barrel, the lower end of the lock ring hanger is connected with a setting piston, an opened lock ring is arranged in a groove formed between the outer surface of the lower end of the lock ring hanger and the setting piston outer surface, and the lower joint is in threaded connection to the lower end of the lower working cylinder. The packer can be put down to the seven stage in a well and unpacked stage-by-stage from top to bottom.

Description

Balance type step-by-step releasable flushing packer

Technical field

The utility model relates to the used packer in oil recovery field, especially a kind of balance type step-by-step releasable flushing packer.

Background technology

[0002] during the oilfield exploitation seperated layer water injection, packer is a kind of downhole tool of commonly using, utilizes packer multiple zone can be divided into some intervals, and it is the effective ways of realizing oil field stable high yield that the oil reservoir of different permeabilities is carried out the subdivision of reservoir water filling.Be connected with multiple-string packer under the injection well pipe column at present, deblocking adopts the upper lifting pipe post to cut off the mode of deblocking pin substantially.When deblocking, the removing seal for packer action is carried out simultaneously, causes the upper lifting pipe column load large, causes the problem of the whole deblocking difficulty of existing tubing string and easy Ka Jing.

Summary of the invention

The technical problem that exists in order to solve background technology, the utility model provides a kind of balance type step-by-step releasable flushing packer, and this packer can once be lowered to seven grades in a bite well, gradually deblocking from top to bottom during deblocking.

The technical solution of the utility model is: this balance type step-by-step releasable flushing packer comprises top connection, top connection connects with upper seating nipple by external screw thread, top connection is connected with central tube by internal thread, be provided with deblocking piston and well-flushing piston in the chamber between upper seating nipple and the central tube, well-flushing piston lower end screw thread is connected with the cushion rubber pressure cap, the deblocking piston connects with upper seating nipple by the deblocking pin, central tube is connected with the deblocking piston by upper external screw thread, there are 4 inlet opening A the central tube upper end of deblocking piston below, there are 6 inlet opening B upper seating nipple lower end, upper seating nipple lower end is connected with the solution big envelope by internal thread, separate the big envelope inner surface stairstepping step is arranged, separating big envelope is connected with the deblocking extension by deblocking extension pin, deblocking hangs up end 8 holes, steel ball is housed in it, the central tube outer wall is provided with bushing pipe, bushing pipe is connected with central tube by the lower end internal thread, there are 6 inlet opening Cs relative with the well-flushing piston bushing pipe upper end, the central tube middle part forms the gap by annular groove and bushing pipe, the bushing pipe outer surface of upper has boss, the bushing pipe overcoat has 2 limit packing elements and 1 middle packing element, between separate with spacer ring, liner at its lower end has 6 inlet openings, lower seating nipple is connected with lower contact by the lower end internal thread, lower contact is connected with central tube by the upper end internal thread, there is inlet opening D the central tube lower end, packing element below, limit is provided with lock ring and hangs, lock ring is hung and is connected with lower seating nipple by setting pin, lower seating nipple upper inside surface is hung with lock ring by notched teeth and is connected, lock ring hangs up end 6 inlet opening E, lock ring hang by the lower end external screw thread with set piston and be connected, lock ring is hung the lower end external surface and is set the lock ring that opening is housed in the groove that outer surface of piston forms, the external surface of lock ring has notched teeth, and lower seating nipple lower end screw thread is connected with lower contact.

The utlity model has following beneficial effect: owing to take such scheme, the upper lifting pipe cornice moves top connection, upper seating nipple is up, setting pin cuts off, driving the solution big envelope continues up, the stairstepping step of separating the big envelope inner surface leaves steel ball, and steel ball skids off and drives deblocking hang up row under deblocking is hung the effect of pin, and packing element is regained under the effect of self screen resilience, removing seal for packer, deblocking are linked with the up packer such as moving bushing pipe, central tube and propose.This packer can once be lowered to seven grades in a bite well, gradually deblocking from top to bottom during deblocking.

Description of drawings:

Accompanying drawing 1 is the utility model structural representation.

The specific embodiment:

The utility model is described in further detail below in conjunction with accompanying drawing:

By shown in Figure 1, this balance type step-by-step releasable flushing packer, comprise top connection 1, it is characterized in that: top connection 1 connects with upper seating nipple 4 by external screw thread, top connection 1 is connected connection by internal thread with central tube, be provided with deblocking piston 2 and well-flushing piston 6 in the chamber between upper seating nipple 4 and the central tube 5, and well-flushing piston 6 lower end screw threads are connected with cushion rubber pressure cap 7, be inlaid with T shape cushion rubber in the cushion rubber pressure cap 7, well-flushing piston 6, T shape cushion rubber and cushion rubber pressure cap 7 form the well-flushing piston assembly.Deblocking piston 2 connects with upper seating nipple 4 by deblocking pin 3, central tube 5 is connected connection by upper external screw thread with the deblocking piston, there are 4 inlet opening A 23 central tube 5 upper ends of deblocking piston 2 belows, there are 6 inlet opening B 25 upper seating nipple 4 lower ends, upper seating nipple 4 lower ends are connected with solution big envelope 9 by internal thread, separate big envelope 9 inner surfaces the stairstepping step is arranged, separating big envelope 9 is connected with deblocking extension 11 by deblocking extension pin 10, deblocking is hung 11 upper ends 8 holes, steel ball 22 is housed in it, and deblocking is hung 11 outer walls and is provided with annular groove 21.Central tube 5 outer walls are provided with bushing pipe 8, bushing pipe 8 is connected with central tube 5 by the lower end internal thread, there are 6 inlet opening Cs 24 relative with well-flushing piston 6 bushing pipe 8 upper ends, central tube 5 middle parts form gap 26 by annular groove and bushing pipe 8, bushing pipe 8 outer surface of upper have boss 27, bushing pipe 8 overcoats have 2 limit packing elements 12 and 1 middle packing element 14, between separate with spacer ring 13, there are 6 inlet openings 28 bushing pipe 8 lower ends, lower seating nipple 18 is connected with lower contact 20 by the lower end internal thread, lower contact 20 is connected with central tube 5 by the upper end internal thread, there is inlet opening D 30 central tube 5 lower ends, packing element 12 belows in limit are provided with lock ring and hang 15, lock ring is hung 15 and is connected with lower seating nipple 18 by setting pin 16, lower seating nipple 18 upper inside surface are hung 15 by notched teeth and lock ring and are connected, lock ring is hung 15 upper ends 6 inlet opening E 29, lock ring hang 15 by the lower end external screw thread with set piston 19 and be connected, lock ring is hung 15 lower end external surfaces and is set the lock ring 17 that opening is housed in the groove that piston 19 external surfaces form, the external surface of lock ring 17 has notched teeth, and lower seating nipple 18 lower end screw threads are connected with lower contact 20.Inlet opening B 25 and inlet opening C 24 and gap 26 and inlet opening 28 and inlet opening E 29 form the well-flushing passage.Sealing ring is equipped with in sealing place.

Packer setting: packer is with in the tubing string lower going-into-well, suppress in the tubing string, liquid enters by central tube 5 upper end inlet opening A 23 and acts in the well-flushing piston assembly, the closed well washing passage, liquid enters by central tube 5 lower end inlet opening D 30, act on and set on the piston 19, driving lock ring hangs 15 up, make to set pin 16 and cut off, lock ring is hung 15 and is continued up compression packing element, packer setting, the notched teeth of lock ring 17 appearances acts on the notched teeth of lower seating nipple 18 upper end inner surfaces at this moment, make lock ring 17 can't relatively descend seating nipple 18 to move down, after the tubing string internal pressure removed, packer still was in the state of setting.

Packer well-washing: annular space is suppressed on the packer, the inlet opening B 25 of liquid by upper seating nipple 4 lower ends enters and acts in the well-flushing piston assembly, the up inlet opening C 24 of well-flushing piston assembly and inlet opening B 25 are communicated with, it is 15 up that the packer setting aft closure ring is hung, the inlet opening E 29 that lock ring is hung 15 upper ends exposes relative with inlet opening 28, the well-flushing Channel Perfect is opened, upper annulus fluid enters from inlet opening B 25, through inlet opening C 24, gap 26, inlet opening 28, enter lower annular space well-flushing from inlet opening E 29 outflows.Well-flushing is complete, suppresses in the central tube, and liquid enters by central tube 5 upper end inlet opening A 23 and acts in the well-flushing piston assembly closed well washing passage.

Removing seal for packer: the upper lifting pipe cornice moves top connection 1, upper seating nipple 4 is up, setting pin cuts off, driving solution big envelope 9 continues up, the stairstepping step of separating big envelope 9 inner surfaces leaves steel ball 22, steel ball 22 skids off and drives deblocking hang 11 up under deblocking is hung the effect of pin 10, packing element is regained under the effect of self screen resilience, and removing seal for packer, deblocking are hung 11 and driven the up packers such as bushing pipes 8, central tube 5 and propose.

Claims

1. balance type step-by-step releasable flushing packer, comprise top connection (1), it is characterized in that: top connection (1) connects with upper seating nipple (4) by external screw thread, top connection (1) is connected 5 by internal thread with central tube) connect, be provided with deblocking piston (2) and well-flushing piston (6) in the chamber between upper seating nipple (4) and the central tube (5), well-flushing piston (6) lower end screw thread is connected with cushion rubber pressure cap (7), deblocking piston (2) connects with upper seating nipple (4) by deblocking pin (3), central tube (5) is connected 2 by upper external screw thread with the deblocking piston) connect, there are 4 inlet opening A (23) central tube (5) upper end of deblocking piston (2) below, there are 6 inlet opening B (25) upper seating nipple (4) lower end, upper seating nipple (4) lower end is connected with solution big envelope (9) by internal thread, separate big envelope (9) inner surface the stairstepping step is arranged, separating big envelope (9) is connected by deblocking extension pin (10) and deblocking extension (11), deblocking is hung (11) upper end 8 holes, steel ball (22) is housed in it, central tube (5) outer wall is provided with bushing pipe (8), bushing pipe (8) is connected with central tube (5) by the lower end internal thread, there are 6 inlet opening Cs (24) relative with well-flushing piston (6) bushing pipe (8) upper end, central tube (5) middle part has annular groove and bushing pipe (8) to form gap (26), bushing pipe (8) outer surface of upper has boss (27), bushing pipe (8) overcoat has 2 limit packing elements (12) and 1 middle packing element (14), between separate with spacer ring (13), there are 6 inlet openings (28) bushing pipe (8) lower end, lower seating nipple (18) is connected with lower contact (20) by the lower end internal thread, lower contact (20) is connected with central tube (5) by the upper end internal thread, there is inlet opening D (30) central tube (5) lower end, limit packing element (12) below is provided with lock ring and hangs (15), lock ring is hung (15) and is connected with lower seating nipple (18) by setting pin (16), lower seating nipple (18) upper inside surface is hung (15) by notched teeth and lock ring and is connected, lock ring is hung (15) upper end 6 inlet opening E (29), lock ring hang (15) by the lower end external screw thread with set piston (19) and be connected, lock ring is hung (15) lower end external surface and is set the lock ring (17) that opening is housed in the groove that piston (19) external surface forms, the external surface of lock ring (17) has notched teeth, and lower seating nipple (18) lower end screw thread is connected with lower contact (20).

2. balance type step-by-step releasable flushing packer according to claim 1 is characterized in that: inlet opening B (25) and inlet opening C (24) and gap (26) and inlet opening (28) and inlet opening E (29) composition well-flushing passage.

3. balance type step-by-step releasable flushing packer according to claim 1 is characterized in that: be inlaid with T shape cushion rubber in the cushion rubber pressure cap (7), well-flushing piston (6), T shape cushion rubber and the piston assembly of cushion rubber pressure cap (7) composition well-flushing.

4. balance type step-by-step releasable flushing packer according to claim 1 is characterized in that: deblocking is hung (11) outer wall and is provided with annular groove (21).

5. balance type step-by-step releasable flushing packer according to claim 1, it is characterized in that: sealing ring is equipped with in sealing place.