CN203948068U - Large pressure difference washable compressive packer for oil well - Google Patents

Abstract

The utility model discloses a big pressure differential washable well compression packer of oil well is designed for guaranteeing going on smoothly of oil well separate layer water injection. The two ends of the central tube of the packer are respectively connected with an upper joint, a lower joint, an upper cylinder sleeve and a lower cylinder sleeve, a pressure guide channel and a setting pressure guide hole are arranged on the central tube, a spring, a well washing piston, a sealing pressure cap, an upper sheath, an edge rubber tube, a spacer ring, a middle rubber tube, a lower sheath and an adjusting ring are sleeved on a liner tube outside the central tube, and a stepped setting piston, a fixed piston and a balance piston are arranged in the lower cylinder sleeve. The packer can guarantee closed well washing, can bear the influence of large interlayer pressure difference fluctuation, is reliable in sealing, can avoid opening of a well washing channel caused by the interlayer pressure difference fluctuation, guarantees that the sealing of the packer does not lose efficacy, and improves the reliability of the well washing operation of the packer.

Description

Large pressure difference washable compressive packer for oil well

technical field

The utility model relates to an oil well washable compressive packer with large pressure difference, which belongs to the technical field of layered water injection in oil fields. the

Background technique

At present, the conventional Y341 packer used in domestic oil wells for layered water injection can basically meet the technical requirements of layered water injection. With the deepening of oilfield development, the interlayer pressure of the oil well fluctuates greatly. During the multi-layer layered water injection operation, the conventional packer is affected by the pressure difference between the layers, and the well flushing channel is opened, and the upper and lower layers communicate with each other for water injection. affect the dispensing effect. the

Contents of the invention

The purpose of the utility model is to provide a large pressure difference washable compressive packer for the oil well, so as to ensure the smooth progress of the layered water injection of the oil well. the

Concrete technical content of the present utility model is as follows:

The outer thread of the upper end of the center pipe of this packer is connected to the upper joint sealed by the rubber ring, and the outer thread of the lower end is connected to the lower joint sealed by the rubber ring. The upper part of the outer wall of the pipe is fitted with a liner; the upper joint is externally threaded to connect the upper liner with the upper channel for flushing the well, the pressure guide sleeve is threaded between the liner and the upper liner, and the spring on the liner set, The well flushing piston sealed by the rubber ring, the sealing pressure cap sealed by the copper core rubber ring and connected to the piston by the internal thread, the upper sheath connected to the inner wall of the bottom end of the upper cylinder liner by the external thread, the side rubber tube, the spacer ring, and the middle rubber tube , The lower sheath is connected with the inner thread of the sleeve and is provided with an adjusting ring for the downhole cleaning channel; the outer wall of the lower joint is connected to the lower cylinder liner through the seat seal pin, the inner wall of the lower cylinder liner is provided with horse teeth, and the cylinder liner is equipped with The stepped seat seal piston, fixed piston and balance piston sealed by the rubber ring on the central tube of the suit, the stepped seat seal piston is threaded to the inner wall of the top of the lower cylinder liner, and the fixed piston is provided with a lock ring and an unsealing pin and is secured by a retaining ring. It is fixed with the central pipe, and the annular space between the stepped sealing piston and the fixed piston corresponds to the setting pressure guide hole. the

The packer can ensure airtight well flushing, can withstand the influence of large interlayer pressure fluctuations, has reliable sealing, can avoid the opening of the well flushing channel caused by interlayer pressure fluctuations, and ensures that the seal of the packer will not fail , Improve the reliability of the packer flushing operation. the

Description of drawings

Fig. 1 is a schematic diagram of the upper structure of an oil well washable compression packer with large pressure difference. the

Fig. 2 is a schematic diagram of the lower structure of the oil well washable compression packer with large pressure difference. the

Detailed ways

Example:

The embodiment of the utility model is further described with reference to Fig. 1 and 2:

The packer mainly includes upper joint 1, upper cylinder liner 2, pressure guiding channel 4, pressure guiding sleeve 5, spring 7, liner 8, well flushing piston 9, well flushing upper channel 11, sealing pressure cap 12, steel core rubber Ring 13, upper sheath 15, side rubber tube 16, middle rubber tube 17, spacer ring 18, lower sheath 19, adjustment ring 20, downhole washing channel 21, seat seal piston 22, seat seal pressure guiding hole 24, fixed piston 25. Locking ring 26, unsealing pin 27, retaining ring 28, central tube 29, lower cylinder liner 30, balance piston 32, seat sealing pin 34 and lower joint 35;

The upper end of the central pipe 29 is externally threaded to the upper joint 1 sealed by an O-ring, and the lower end is externally threaded to the lower joint 35 sealed by an O-ring. Pressure hole 24, the upper part of the outer wall of the pipe is fitted with a liner 8; the upper joint 1 is externally threaded to connect the upper cylinder liner 2 provided with the upper channel 11 for flushing the well, and the pressure guiding sleeve 5 is threaded between the liner 8 and the upper liner 2 to guide the pressure Below the casing 5 are the spring 7 on the casing liner 8, the well flushing piston 9 sealed by the O-shaped rubber ring, the sealing pressure cap 12 sealed by the copper core rubber ring 13 and connected to the piston by the internal thread, and the upper cylinder connected to the external thread. The upper sheath 15, the side rubber tube 16, the spacer ring 18, the middle rubber tube 17, the lower sheath 19 of the inner wall of the bottom end of the sleeve 2 are connected with the internal thread of the sleeve and the adjustment ring 20 provided with the lower channel 21 for washing the well; the lower joint 35 The outer wall is connected to the lower cylinder liner 30 through the seat seal pin 34, the inner wall of the lower cylinder liner 30 is provided with horse teeth, and the cylinder liner is provided with a step-type seat seal piston 22 sealed by a rubber ring on the central tube 29 from top to bottom in the cylinder liner. The fixed piston 25 and the balance piston 32, the stepped seat seal piston 22 is threadedly connected to the top inner wall of the lower cylinder liner 30, the fixed piston 25 is provided with a lock ring 26 and an unblocking pin 27 and is fixed by the retaining ring 28 and the central tube 29, the stepped seat The annular space between the sealing piston 22 and the fixed piston 25 corresponds to the setting pressure guide hole 24 . the

The working process of this packer is as follows:

Setting process: This packer is a hydraulic pressure-assisted compression packer. When setting, the fluid in the central tube 29 enters the ring between the stepped sealing piston 22 and the fixed piston 25 through the setting pressure guide hole 24. Empty, boost the stepped seat seal piston 22 and drive the lower cylinder liner 30 to move upwards, extrude the rubber tube to set the seal, and cut off the seat seal pin 34 at the same time. When the setting is completed, the lock ring 26 and the lower cylinder liner 30 are engaged by the horse teeth. After the central tube 29 is depressurized, it is limited by the horse teeth. Release the pressure so that the cartridge does not rebound and remains set. the

Unsealing process: The unsealing method of this packer is mechanical unsealing, that is, the unsealing is realized by lifting the string and cutting the unsealing pin 27. the

Well flushing process: During well flushing, when the casing pressure is greater than the preset pressure of the spring 7, the piston compresses the spring, and the well flushing piston 9 and the sealing pressure cap 12 move together to connect the upper flushing channel 11, the liner 8 and the center pipe The gap between 29 and the well-flushing lower channel 21 form the well-flushing channel; when the well-flushing ends, the spring 7 promotes the well-flushing piston 9 and the sealing pressure cap 12, so that the pressure cap moves to the upper end surface of the upper sheath 15, and closes the well-flushing upper channel 11. the

Claims (1)

1. A large pressure difference washable compressive packer for oil wells, characterized in that: The upper end of the central pipe (29) of the packer is connected to the upper joint (1) sealed by the rubber ring, and the lower end of the outer thread is connected to the lower joint (35) sealed by the rubber ring. 4), the lower part is provided with a setting pressure guide hole (24), and the upper part of the outer wall of the pipe is fitted with a liner (8); the upper joint (1) is externally threaded to connect the upper cylinder liner (2) with the upper channel (11) for well flushing, and the guide The pressure sleeve (5) is threadedly connected between the liner (8) and the upper cylinder liner (2), and below the pressure guide sleeve (5) are the spring (7) on the sleeve liner (8) and the seal sealed by the rubber ring. The well flushing piston (9), the sealing pressure cap (12) sealed by the copper core rubber ring (13) and connected to the piston by the internal thread, the upper sheath (15) connected to the inner wall of the bottom end of the upper cylinder liner (2) by the external thread, The side rubber tube (16), spacer ring (18), middle rubber tube (17), lower sheath (19) and sleeve internal thread connection and is provided with the adjustment ring (20) of the well-washing lower channel (21); the lower joint (35) The outer wall is connected to the lower cylinder liner (30) through the seat seal pin (34), and the inner wall of the lower cylinder liner (30) is provided with a horse tooth, and the inner wall of the cylinder liner is provided with a set on the central tube (29) from top to bottom. Rubber ring-sealed stepped seat seal piston (22), fixed piston (25) and balance piston (32), the stepped seat seal piston (22) is threaded to the top inner wall of the lower cylinder liner (30), and the upper A lock ring (26) and an unsealing pin (27) are provided and fixed by a retaining ring (28) and a central tube (29). Press holes (24).