CN2703868Y - Acidifying lower-sealing packer - Google Patents

Abstract

The utility model discloses an acidifying lower-sealing packer composed of an upper joint, an inner central pipe, an unfolding cover, an outer central pipe, a rubber barrel, a lock cover, a locking ring seat, a plunger and a lower joint. The unfolding cover is buckled to connect with the outer central pipe, the unfolding cover is sheathed on the upper joint and the inner central pipe, and at least four opening grooves are arranged in the lower part of the outer central pipe. The opening groove is buckled to connect with the locking ring seat in the lower part of the opening groove, the locking ring seat is provided with an upper sealing ring and a lower sealing ring to seal the connection hole on the inner central pipe, and the plunger is sheathed on the inner central pipe and the lower joint. The acidifying lower-sealing packer can ensure the effective seal of execution process when the oil water well has an acidification or press-breaking operation, and the ground-layer liquid in under-layer can not enter an acidifying layer. The acidifying lower-sealing packer can protect the lower oil layer from pollution, and the acidifying layer can realize a thoroughly reverse ejection, so the acidifying effect is improved and the oil well yield and the water well injection amount are increased.

Description

Sealed packer under a kind of acidifying

Technical field: the utility model relates to a kind of packer, is applicable to the following sealed packer in separate layer acid treatment, the fracturing string.

Background technology: acidifying; pressure break is as oil formation improvement; improve oil; an increasing yield and injection measure of gas well deliverability and water injection well water absorbing capacity obtains the oil field extensive use; following sealed packer in the jet acid discharge separate layer acid treatment tubing string requires packer to be designed to not well-flushing mode; guarantee to realize that each layer can thoroughly separate; eliminate interlayer interference; the packer bottom is connected with sealed ball seat simultaneously; the seat oil jacket of being honored as a queen no longer is communicated with; purpose is to guarantee that packer bottom oil reservoir is protected when acidifying; lower floor's liquid can not enter the anti-row of oil pipe influence effect again when anti-row; guarantee the thoroughly anti-row of the residual acid of acidifying layer, when deblocking, realize smooth deblocking.And use the patent No. to be ZL02280860.4 " novel band negative pressure cavity can not flushing packer " at present, can satisfy acidifying layering requirement, but because packer does not have inside and outside means of communication when the tubing string deblocking, oil jacket can't be realized balance, thereby cause the packer can not deblocking.

Summary of the invention: the purpose of this utility model overcomes the deficiencies in the prior art exactly, and sealed packer under a kind of acidifying is provided.

The purpose of this utility model is achieved in that sealed packer is by top connection under the acidifying, inner central tube, separate big envelope, exterior central tube, packing element, lock tube, the lock ring seat, piston, lower contact is formed, top connection, inner central tube, the lower contact screwed connection, packing element is enclosed within on the exterior central tube, separate big envelope and exterior central tube screwed connection, the deblocking cover is inserted in top connection, on the inner central tube, the exterior central tube bottom has at least 4 open slots, and with the lock ring seat in the screwed connection of open slot bottom, the lock ring seat places the cavity between inner central tube and the lock tube, have intercommunicating pore on the lock tube, circle has the two seals groove in the lock ring seat, sealing ring is put on two seals groove top, lower seal is put in the bottom, on, lower seal sealing inner central tube intercommunicating pore is provided with the lock pawl in the fluting on the lock ring seat, piston is inserted in inner central tube and the lower contact.

When the utility model carries out acidifying, pressing crack construction at oil-water well; can guarantee effective sealing of work progress; and lower floor's formation fluid can not enter the acidifying layer; reach and not only do not protect the bottom oil reservoir contaminated but also make the acidifying layer realize thoroughly anti-row; thereby the raising acidizing effect increases well oil output, well injection rate purpose.

Description of drawings: Fig. 1: the utility model structural representation;

Among the figure: 1-top connection, 2-inner central tube, 3-separate big envelope, 4-exterior central tube, 5-packing element, 6-lock tube, 7-lock ring seat, 8-intercommunicating pore, the last sealing ring of 9-, 10-lock pawl, 11-inner central tube intercommunicating pore, 12-lower seal, 13-piston, 14-lower contact;

The specific embodiment: as shown in Figure 1, sealed packer is by top connection 1 under the acidifying, inner central tube 2, separate big envelope 3, exterior central tube 4, packing element 5, lock tube 6, lock ring seat 7, piston 13, lower contact 14 is formed, top connection 1, inner central tube 2, lower contact 14 screwed connections, packing element 5 is enclosed within on the exterior central tube 4, separate big envelope 3 and exterior central tube 4 screwed connections, separate big envelope 3 and be inserted in top connection 1, on the inner central tube 2, exterior central tube 4 bottoms have at least 4 open slots, and with lock ring seat 7 in the screwed connection of open slot bottom, lock ring seat 7 places the cavity between inner central tube 2 and the lock tube 6, have intercommunicating pore 8 on the lock tube 6, circle has the two seals groove in the lock ring seat 7, sealing ring 9 is put on two seals groove top, lower seal 12 is put in the bottom, last sealing ring 9 and lower seal 12 sealing inner central tube intercommunicating pores 11, lock pawl 10 places in the fluting on the lock ring seat 7, and piston 13 is inserted in inner central tube 2 and the lower contact 14.

With in this packer lower going-into-well, the seat envelope: suppress in oil pipe, pressure enters piston 13 inner chambers by the pressure transmission hole of inner central tube 2 during use, promote piston 13, lock tube 6 up compression packing elements 5, in the special type that lock ring 10 enters lock tube 6 is buckled, and keep this locking state, guarantee the sealing after the release; The course of work: packer bears pressure reduction and guarantees effectively sealing during acidifying; Oil reservoir top is connected with jet returns arranging device in that acidifying is anti-when arranging, and packer guarantees that each layer becomes independently pressure system, eliminates interlayer interference, and the residual acid of acidifying layer is the row of returning thoroughly; Deblocking: after finishing above-mentioned work, the upper lifting pipe post, because packing element 5 keeps motionless with the rubbing action of sleeve pipe, top connection 1, inner central tube 2, move in the lower contact 14, it is static relatively that remaining part keeps, separate big envelope 3 and separate with top connection 1, exterior central tube 4 lower openings groove undergauges, lock ring seat 7 loses support, under the elastic force effect of packing element 5, separate with exterior central tube 4, last sealing ring 9 is subjected to displacement with lower seal 12 and intercommunicating pore 11, solves sealing, and inner central tube intercommunicating pore 11 communicates with lock tube intercommunicating pore 8, in the packer, external communications, piston 13 does not have pressure reduction up and down, and the smooth deblocking of packer can trip out.

Claims (1)

1, sealed packer under a kind of acidifying, it is by top connection (1), inner central tube (2), separate big envelope (3), exterior central tube (4), packing element (5), lock tube (6), lock ring seat (7), piston (13), lower contact (14) is formed, top connection (1), inner central tube (2), lower contact (14) screwed connection, packing element (5) is enclosed within on the exterior central tube (4), it is characterized in that: separate big envelope (3) and exterior central tube (4) screwed connection, separate big envelope (3) and be inserted in top connection (1), on the inner central tube (2), exterior central tube (4) bottom has at least 4 open slots, and with lock ring seat (7) in the screwed connection of open slot bottom, lock ring seat (7) places the cavity between inner central tube (2) and the lock tube (6), have intercommunicating pore (8) on the lock tube (6), circle has the two seals groove in the lock ring seat (7), sealing ring (9) is put on two seals groove top, lower seal (12) is put in the bottom, last sealing ring (9) and lower seal (12) sealing inner central tube intercommunicating pore (11), be provided with lock pawl (10) in the fluting on the lock ring seat (7), piston (13) is inserted in inner central tube (2) and the lower contact (14).