CN201106435Y - Sliding sleeve type packer for horizontal well separate layer fracturing - Google Patents

Abstract

The utility model provides a horizontal well separate layer fracturing sliding sleeve formula packer for oil field borehole operation, characterized by: the outer pipe wall of the central pipe 4 is provided with a righting anchor 11, and three anchoring claws which are arranged corresponding to the holes on the righting outer sleeve are uniformly distributed along the circumference of the outer wall. The utility model discloses rational in infrastructure, processing is easy, convenient operation, reliable operation, because the effect of righting anchor 11 can make it be located sleeve pipe center, go up packing element 10 and lower packing element 12 can follow the circumference and evenly release when setting to ensured reliable and stable sealed, can realize the layering (section) fracturing of oil field horizontal well through field application.

Description

Sliding sleeve packer for horizontal well layered fracturing

Technical field:

The utility model relates to a downhole tool for oilfields, in particular to a layered fracturing sliding sleeve packer for horizontal wells.

Technical background: Before this utility model, as a horizontal well technology that can greatly increase the oil production of a single well in an oil field, after water injection development in low-permeability reservoirs, there is no sliding sleeve suitable for horizontal well layered (segment) fracturing Since the conventional packer is placed in a horizontal state, it will fall against the lower side of the casing due to gravity. When setting, the rubber tube cannot be released evenly along the circumference and cannot work normally, and the stratification of horizontal wells cannot be achieved. (segment) fracturing, which reduces the applicable scope and application effect of horizontal well technology.

Invention content:

The purpose of this utility model is to provide a horizontal well layered fracturing sliding sleeve packer for the oil field, which can be used in the layered (segmental) fracturing process of the horizontal well, because the rubber cylinder can be released evenly along the circumference when setting, In order to realize the layered (segment) fracturing of the horizontal well in the oil field, and improve the applicable scope and application effect of the horizontal well technology.

The purpose of this utility model is achieved by the following measures: a horizontal well layered fracturing sliding sleeve packer, including an upper joint 1, a support sleeve 2, an unsealing sliding sleeve 3, a center pipe 4, and a well flushing piston 5. Well cleaning cylinder 6, sliding sleeve 7, upper piston 8, upper block 9, upper rubber barrel 10, lower rubber barrel 12, lower block 13, lower piston 14, lower joint 15, valve 16, unsealing Shear nails 17, well cleaning shear nails 18, safety shear nails 19, upper piston shear nails 20, lower piston shear nails 21, Vail shear nails 22, etc.; And the unsealing sliding sleeve 3, the lower end is connected to the lower joint 15 and the valve 16 in the pipe, and the outer pipe wall is successively installed with the well cleaning cylinder 6, the well cleaning piston 5, the upper rubber cylinder 10, the upper piston 8, and the upper block 9, the lower rubber tube 12, the lower clamping block 13, the lower piston 14, and a sliding sleeve 7 is also installed in the tube; it is characterized in that: on the outer wall of the central tube 4, a The centralizing anchor 11 that is made of cylindrical centralizing coat, anchoring claw and positioning pin etc., and the 3-5 anchoring claws that are installed corresponding to the opening on the centralizing coat are evenly distributed along the circumference of its outer wall.

The utility model has the advantages of reasonable structure, easy processing, convenient operation and reliable operation, and can be widely used in various horizontal well layered (segment) fracturing process strings, and can be positioned on the casing due to the function of the righting anchor 11 when setting. The center, the upper rubber cylinder 10 and the lower rubber cylinder 12 can be released evenly along the circumference, thus ensuring a stable and reliable seal.

Description of drawings:

Fig. 1 is a schematic diagram of the structure of a sliding sleeve packer for horizontal well fracturing in layers.

Detailed ways:

Below in conjunction with accompanying drawing 1, the working principle of the utility model is further explained: the horizontal well layered fracturing sliding sleeve packer is composed of an upper joint 1, a support sleeve 2, an unsealing sliding sleeve 3, a center pipe 4, and a well flushing piston 5 , Well cleaning cylinder 6, sliding sleeve 7, upper piston 8, upper block 9, upper rubber barrel 10, righting anchor 11, lower rubber barrel 12, lower block 13, lower piston 14, lower joint 15, valve 16 , unsealing scissors 17, well washing scissors 18, safety scissors 19, upper piston scissors 20, lower piston scissors 21, Vall scissors 22 and the like. The upper end of the central pipe 4 is connected to the upper joint 1 and the support sleeve 2 and the unsealing sliding sleeve 3 in the pipe, and the lower end is connected to the lower joint 15 and the valve 16 in the pipe. Piston 5, upper rubber cylinder 10, upper piston 8, upper clamping block 9, righting anchor 11, lower rubber cylinder 12, lower clamping block 13, lower piston 14, sliding sleeve 7 is also installed in the tube; the outer tube wall of central tube 4 On the centralizing anchor 11 installed between the upper rubber cylinder 10 and the lower rubber cylinder 12, the three anchoring claws are installed corresponding to the openings on the centralizing housing. It is evenly distributed along the circumference of its outer wall.

Hydraulic pressure is applied along the central tube 4 when the sliding sleeve packer is set in the horizontal well layered fracturing, and the liquid pushes the upper piston 8 and the lower piston 14 through the opening in the tube wall to cut off the upper piston shear pin 20 and the lower piston shear pin respectively. After 21, move up and down, the upper clamping block 9 and the lower clamping block 13 are released immediately, and the upper rubber tube 10 and the lower rubber tube 12 start to move to the righting anchor 11, and contact with the upper anchor claw of the righting anchor 11 The action of the inclined plane makes it slide out along the hole on the upper casing of the centralizer, ensuring that the sliding sleeve packer for horizontal well layered fracturing can be anchored in the center of the casing against the force of gravity, and then with continuous pressure, The upper rubber cylinder 10 and the lower rubber cylinder 12 can be evenly released along the circumference. When they are completely released, the upper rubber cylinder 10 and the lower rubber cylinder 12 are respectively locked with the well cleaning cylinder 6 and the central pipe 4 to ensure their tightness. Stable and reliable.

At this time, continue to pressurize along the center pipe 4, the well flushing piston 5 will shear the well flushing shear pin 18 due to the pressure and move down and block the well flushing channel on the well flushing cylinder 6, and the valve 16 will also be pressurized. Shear the shear nail 22 and move down and open the fracturing channel on the lower joint 15, so that the fracturing construction of the lower layer (section) can be carried out; The ball is thrown inside, the sliding sleeve 7 is moved down and sits on the shoulder below it, the fracturing channel on the central pipe 4 is opened and its inner hole is blocked, and the fracturing construction of the upper layer (section) can be carried out.

If unsealing is required after the fracturing construction is completed, the unsealing sliding sleeve 3 can be pushed through the tubing string to cut off the unsealing shear pins 17 and drive the support sleeve 2 to move downward, so that the upper joint 1 and the center pipe 4 are separated, and the anchor is righted. The anchor claw on the 11 retracts, and the upper rubber tube 10 and the lower rubber tube 12 also shrink simultaneously, thereby completing the unsealing.

Claims (1)

1. horizontal well separate stratum fracfturing sleeve type packer, comprise top connection (1), support set (2), deblocking sliding sleeve (3), central tube (4), well-flushing piston (5), well-flushing cylinder barrel (6), sliding sleeve (7), upper piston (8), last fixture block (9), last packing element (10), lower rubber cylinder (12), following fixture block (13), lower piston (14), lower contact (15), valve (16), deblocking shear pin (17), well-flushing shear pin (18), safe shear pin (19), upper piston shear pin (20), lower piston shear pin (21), valve shear pin (22), and central tube (4) upper end connects support set (2) and deblocking sliding sleeve (3) in top connection (1) and the pipe thereof, the lower end connects the valve (16) in lower contact (15) and the pipe thereof, well-flushing cylinder barrel (6) is installed on its outer tube wall successively, well-flushing piston (5), last packing element (10), upper piston (8), last fixture block (9), lower rubber cylinder (12), following fixture block (13), lower piston (14) also is equipped with sliding sleeve (7) in its pipe; It is characterized in that: between last packing element (10) and lower rubber cylinder (12), be equipped with one on central tube (4) outer tube wall and set upright anchor (11), and be along its outer wall circumference uniform distribution with setting upright outer 3-5 the grappling pawl that puts the corresponding installation of perforate by what tubular set upright that overcoat, grappling pawl and alignment pin etc. constitute.

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