CN2515420Y

CN2515420Y - Packer

Info

Publication number: CN2515420Y
Application number: CN 01276315
Authority: CN
Inventors: 王峰; 苟天成; 陈传东; 张雪峰; 高君伟
Original assignee: Sinopec Zhongyuan Oilfield Co No 2 Oil Production Plant
Current assignee: Sinopec Zhongyuan Oilfield Co No 2 Oil Production Plant
Priority date: 2001-11-13
Filing date: 2001-11-13
Publication date: 2002-10-09
Anticipated expiration: 2011-11-13

Abstract

The utility model discloses a packer. The well washing device comprises an upper joint, an inner central tube, an outer central tube, a top sleeve, a check valve, an upper well washing switch assembly, a rubber cylinder, a slip seat, a slip, a lock sleeve, a pressing cap, an unsealing sleeve, an upper piston, a lower piston, a connector and a lower joint. The utility model has the advantages of 1, the lower part adopts sealing, the flushing switch is always in the best working state during water injection, the failure phenomenon of the upper and lower water pressure of the flushing switch is prevented, 2, the upper part of the outer central tube is provided with a check valve, the liquid pressure of the inner and outer central tubes can be effectively released, the upper and lower sealing rings are sealed reliably, and the effective work of positive injection and back flushing is ensured.

Description

A kind of packer

The utility model relates to the packer in a kind of oil gas field seperated layer water injection exploitation, is specially adapted to seperated layer water injection, well-flushing, acidifying and water blockoff.

What often use at water injection well in oil fields at present is that the patent No. is 96249456.9 such packers.In use mainly there is following shortcoming in this packer: 1, the well-flushing switch is positioned at well-flushing passage top, from the lock tube opening part water injection pressure identical to the well-flushing on-off action, causes the well-flushing malfunctioning switch during water filling; 2, deblocking unreasonable structure, slips and slip spider group are one, after elastic deformation disappears, the deblocking difficulty.

The purpose of this utility model is exactly the shortcoming that overcomes prior art, and a kind of packer is provided.

The purpose of this utility model is achieved in that packer is by top connection, in, exterior central tube, the top cover, last well-flushing switch assembly, packing element, slip spider, slips, lock tube, on, lower piston, connector, lower contact is formed, top connection, inner central tube, connector, lower contact constitutes the basic framework of packer by being threaded, exterior central tube and top cover, slip spider, slips is threaded, lock tube is enclosed within on the exterior central tube, upper end at exterior central tube is provided with ball-and-seat, the lock tube lower end is threaded with pressure cap, be provided with sealing ring between lock tube and pressure cap, being connected with opening at connector upper end screw thread is the flaring big envelope of separating.

The utility model with have technology to compare now to have the following advantages: 1, sealing is adopted in the bottom, during water filling, well-flushing switch optimum Working all the time, prevent the well-flushing switch up and down hydraulic pressure malfunctioning phenomenon appears; 2, ball-and-seat is equipped with on exterior central tube top, and the fluid pressure of exterior central tube can effectively discharge in making, and the sealing of two sealing rings is reliable up and down, and it is effective to guarantee just to annotate backwash work.

Below in conjunction with accompanying drawing the utility model is further described:

Fig. 1 is the utility model structural representation;

Fig. 2 is the ball-and-seat structural representation;

Among the figure: 1-top connection, 2-top cover, the last well-flushing switch assembly of 3-, 4-ball-and-seat, 5-inner central tube, 6-exterior central tube, 7-packing element, 8-slip spider, 9-slips, 10-separate big envelope, 11-lock tube, 12-pressure cap, 13-sealing ring, 14-upper piston, 15-connector, 16-lower piston, 1-lower contact;

Packer is mainly by top connection 1, in, exterior central tube 5,6, top cover 2, last well-flushing switch assembly 3, ball-and-seat 4, on, lower piston 14,16, connector 15, lower contact 17 is formed, top connection 1, inner central tube 5, connector 15, lower contact 17 constitutes the basic framework of packer by being threaded, top cover 2 is threaded with top connection 1, last well-flushing switch assembly 3 is contained in the cavity of top cover 2 and top connection 1 formation, packing element 7, spacer ring, joint ring is on exterior central tube 6, exterior central tube 6 and top cover 2 and slip spider 8, slips 9 is threaded, on, lower piston 14,16 are contained on the connector 15, connector 15, separate big envelope 10, lower contact 17 is by being threaded, and it is tubaeform separating big envelope 10 openings.Seat separate sealing mechanism by slips 9, slip spider 8, separate big envelope 10, lock tube 11, inner central tube 5 and form, lock tube 11 lower ends are threaded with lower seal pressure cap 12, and fixing lower seal 13.

Be example with the packer seperated layer water injection below, the utility model will be further described: after the packer that the ground pressure testing is qualified is lowered to design attitude in the separate water injection well by designing requirement, suppress from oil pipe, pressure acts on upper piston 14 by the pressure transmission hole on the connector 15., on the lower piston 16, promote upper piston 14, lower piston 16, lower seal pressure cap 12, move compression packing element 7 on the lock tube 11, make packing element 7 radial dilatation, after being compressed to a certain degree, the locking of joining mutually of lock tube 11 and slips 9, make packing element 7 be adjacent to internal surface of sleeve pipe, with the annular space packing of oil pipe with sleeve pipe.

During anti-flushing well, squeeze into flushing fluid from the pipe box annular space, flushing fluid enters from the well-flushing inlet of top cover 2, to go up on the well-flushing switch and move, the sealing of first road is opened, and flushing fluid enters the annular space of inner central tube 5, exterior central tube 6, subsequently, back down upper piston 14, whole well-flushing passage is opened, and flushing fluid flows out packer, enters the pipe box annular space, return the oil pipe inner chamber from the tubing string bottom again and to well head, arrive at a station, realize anti-flushing well.

Need only the upper lifting pipe post when needing deblocking.Because of being adjacent to of packing element 7 and internal surface of sleeve pipe, and the friction that forms, make the outer component transfixion of packer, and inner central tube 5 drives to separate and moves on the big envelope 10, opening is flaring big envelope 10 rigidity of separating, insert in the slips 9, slips 9 is separated, packing element 7, lock tube 11, upper and lower piston 14,16 descending realization deblockings with lock tube 11.

Claims

1, a kind of packer is by top connection (1), inner central tube (5), exterior central tube (6), top cover (2), last well-flushing switch assembly (3), packing element (7), slip spider (8), slips (9), lock tube (11), upper piston (14), lower piston (16), connector (15), lower contact (17) is formed, top connection (1), inner central tube (5), connector (15), lower contact (17) constitutes the basic framework of packer by being threaded, exterior central tube (6) and top cover (2), slip spider (8), slips (9) is threaded, lock tube (11) is enclosed within on the exterior central tube (6), it is characterized in that: be provided with ball-and-seat (4) in the upper end of exterior central tube (6), lock tube (11) lower end is threaded with pressure cap (12), be provided with sealing ring (13) between lock tube (11) and pressure cap (12), being connected with opening at connector (15) upper end screw thread is the flaring big envelope (10) of separating.