CN201443346U

CN201443346U - Double-channel packer for separated injection washing of water injection well

Info

Publication number: CN201443346U
Application number: CN2009200137102U
Authority: CN
Inventors: 赵广友; 马相君; 周国宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-05-15
Filing date: 2009-05-15
Publication date: 2010-04-28
Anticipated expiration: 2019-05-15

Abstract

The utility model relates to a double-channel packer for separated injection washing of water injection well, comprising an upper adapter, an upper connection bush, a central pipe, a sealing ring, a well-washing piston, a circulation body, a circulation body outer shield, a rubber cylinder, a retainer, a backwashing bush, a sealing body, a setting shear pin, an unsetting shear pin, a clamp spring seat, a clamp spring, a seat cutting sleeve, a setting piston, a lower connection sleeve and a lower adapter. The upper end and the lower end of the central pipe are respectively connected with the upper adapter and the lower adapter; the circulation body is arranged on the outer side of the central pipe; the outer side of the circulation body is sheathed with the well-washing piston, the circulation body outer shield, the rubber cylinder, the retainer and the backwashing bush; the lower outer-side of the central pipe is connected with the sealing body, and the upper end and the outer side of the sealing body are respectively sheathed with the backwashing bush and the seat cutting sleeve; and the lower connecting sleeve and the central pipe are respectively connected with the lower adapter. The double-channel packer has novel structure, reasonable design and reliable work. With the double-channel packer, setting can be avoided in descent half-way so as to ensure regular layered water-injection and well-washing. The double-channel packer has the advantages that length is shorter; pressure-bearing property is higher without requiring big differential pressure; and the sealing component of the well-washing piston can be protected from being stabbed easily, and the like.

Description

A kind of water injection well dispensing well-flushing binary channels packer

Technical field:

The utility model relates to a kind of downhole tool that is used for water injection well in oil fields seperated layer water injection and well-flushing.

Background technology:

Water filling is the important type of drive of oil field development and oil well production, needs regular well-flushing to keep the stratum water absorbing properties stable in the water injection well the injecting process, improves flood effectiveness.

At present, the on-the-spot separate water injection well washing well packer that uses is various informative, of a great variety, but have following shortcoming and defect respectively: 1, the packer body is longer, and seat envelope piston places body exterior, often because a variety of causes causes seat envelope piston stroking upward, the compression packing element sets packer midway, causes down well operations to do over again when going into the well; 2, the well-flushing piston seals by the rubber cushion that compresses that is fixed on the circulation port bottom, is easily badly influenced the application life of packer when well-flushing by the water thorn; 3, packer, is in use easily overturned by hydraulic pressure because packing element is too short by the packing element seal and pressure bearing, and bearing capacity is not strong; For the outside packing element of protective sleeve is arranged, because protective sleeve has occupied sealing surface, so seal section is too short, sealing effectiveness is bad; 4, packer is suppressed when setting, set the piston top and bottom and need form big pressure reduction, thrust compression packing element and realize setting in the generation, this just requires in the casing string mouth of must feigning death of the blanking plug in the injection well downhole flow regulator, blanking plug is pulled out after setting again, change cock after, drop in the injection well downhole flow regulator in the casing string, just can carry out water filling, both increase workload, influence normal water filling again.

The utility model content:

The purpose of this utility model is to provide a kind of body length weak point also can stop midway, and seat envelope, well-flushing piston seal are difficult for stinging the water injection well dispensing well-flushing binary channels packer bad, that bearing capacity needs big pressure reduction by force and not.

The utility model is to realize like this.This kind packer by upper and lower joint, upper and lower adapter sleeve, central tube, well-flushing piston, loop body, loop body oversheath, packing element, spacer ring, backwash cover, seal, seat envelope shear pin, deblocking shear pin, clip spring seat, jump ring, seat cutting ferrule, set piston and sealing ring is formed, its structure, assembled relation are as follows: the central tube upper and lower end is connected with lower contact with top connection with screw thread respectively; On the central tube, the middle part outside is provided with loop body, the loop body outside is set with well-flushing piston, loop body oversheath, packing element, spacer ring and backwash cover from top to bottom successively, wherein the loop body oversheath is connected with loop body with screw thread, the well-flushing piston is provided with sealing ring; The outside, central tube bottom is with the seal that has been threaded, and seal by sealing ring, the seal upper end and the outside are respectively installed with the backwash cover and sit cutting ferrule, wherein, the backwash cover is fixed on the seal by seat envelope shear pin, be provided with sealing ring between seal and the seat cutting ferrule, the seal lower end is fixed with clip spring seat by the deblocking shear pin, and jump ring is housed on the clip spring seat; Sit the cutting ferrule lower end and be equipped with and set piston, set piston be provided with sealing ring respectively with sit cutting ferrule, central tube and lower joint sleeve sealing; Lower joint sleeve, central tube are connected with lower contact with screw thread respectively, and lower contact is provided with sealing ring and lower joint sleeve sealing.

During use, by oil pipe this instrument is sent to the precalculated position, down-hole, inject highly pressurised liquid in the oil pipe, highly pressurised liquid acts on the bottom surface that sets piston by the flowing hole on the central tube, owing to sit cutting ferrule, set piston, formed between clip spring seat and the central tube one compressible, sealing air chamber movably, so completely cut off the liquid column hydrostatic pressure of sitting the cutting ferrule outside, make the interior head of liquid of oil pipe act on the bottom surface that sets piston fully, set this moment on the piston drive seat cutting ferrule and move the seat envelope shear pin of cutting off the backwash cover, compress packing element simultaneously and make its expansion, this moment, jump ring locked together with the card tooth of sitting on the cutting ferrule, prevented to sit cutting ferrule and return, and realized packer setting; When stopping annotating the back well-flushing, pressure release in the oil pipe, inject flushing fluid in the annular space between sleeve pipe and oil pipe, flushing fluid promotes to move on the well-flushing piston, open the circulation port on the loop body, make flushing fluid enter circulation canal and flow out, reach the purpose of well-flushing from the circulation port of loop body lower end, the circulation port that backwash puts; Stop washing in the oil pipe of back during water filling, water under high pressure acts on the well-flushing piston by the flowing hole in the top connection, and the well-flushing descent of piston is resetted, and circulation canal is closed, and reaches the purpose of seperated layer water injection; During deblocking, on carry tubing string, when the frictional force of packing element and internal surface of sleeve pipe during greater than the shearing resistance of deblocking shear pin, the deblocking shear pin is cut off, packing element resets, and reaches the purpose of deblocking.

The utility model novel structure, reasonable in design, reliable operation, seat seals to utilize it can stop to go into the well midway, guarantee normal seperated layer water injection and well-flushing, this packer has advantages such as length is short, bearing capacity needs big pressure reduction by force and not, the difficult thorn of well-flushing piston seal is bad.

Description of drawings:

Accompanying drawing is the utility model overall structure schematic diagram.

The specific embodiment:

As shown in the figure: the utility model by top connection 1, upper joint sleeve 2, central tube 3,

sealing ring

4,5,6,15,20,22, well-flushing piston 7, loop body 8, loop body oversheath 9, packing element 10, spacer ring 11, backwash cover 12, seal 13, seat envelope shear pin 14, deblocking shear pin 16, clip spring seat 17, jump ring 18, sit cutting ferrule 19, set piston 21, lower joint sleeve 23, lower contact 24 form; Wherein, top connection 1 is provided with flowing hole 30.Central tube 3 upper and lower ends have respectively to be connected with lower contact 24 with top connection 1 uses pin thread, and its lower end is provided with flowing hole 25.Loop body 8 is provided with circulation port 29, and backwash cover 12 is provided with circulation port 26.Constitute circulation canal 28 between central tube 3 and the loop body 8.Sit cutting ferrule 19, set formation counter balance pocket 27 between piston 21, clip spring seat 17 and the central tube 3.

Claims

1. water injection well dispensing well-flushing binary channels packer, top connection (1), upper joint sleeve (2), central tube (3), sealing ring (4), (5), (6), (15), (20), (22), well-flushing piston (7), loop body (8), loop body oversheath (9), packing element (10), spacer ring (11), backwash cover (12), seal (13), seat envelope shear pin (14), deblocking shear pin (16), clip spring seat (17), jump ring (18), sit cutting ferrule (19), set piston (21), lower joint sleeve (23), lower contact (24) form; It is characterized in that: central tube (3) upper and lower end is connected with lower contact (24) with top connection (1) with screw thread respectively; Central tube (3) is gone up, the outside, middle part is provided with loop body (8), loop body (8) outside is set with well-flushing piston (7), loop body oversheath (9), packing element (10), spacer ring (11) and backwash cover (12) from top to bottom successively, wherein loop body oversheath (9) is connected with loop body (8) with screw thread, and well-flushing piston (7) is provided with sealing ring (4-7); The outside, central tube (3) bottom is with the seal that has been threaded (13), and seal by sealing ring, seal (13) upper end and the outside are respectively installed with backwash cover (12) and sit cutting ferrule (19), wherein, backwash cover (12) is fixed on the seal (13) by seat envelope shear pin (14), be provided with sealing ring (15) between seal (13) and the seat cutting ferrule (19), seal (13) lower end is fixed with clip spring seat (17) by deblocking shear pin (16), and jump ring (18) is housed on the clip spring seat (17); Sit cutting ferrule (19) lower end and be equipped with and set piston (21), set piston (21) be provided with sealing ring (20) respectively with sit cutting ferrule (19), central tube (3) and lower joint sleeve (23) and seal; Lower joint sleeve (23), central tube (3) are connected with lower contact (24) with screw thread respectively, and lower contact (24) is provided with sealing ring (22) and lower joint sleeve sealing.