CN103132944B - Hydraulic Small Diameter Packer for Sand Control - Google Patents

Abstract

The invention relates to a sand-prevention hydraulic small-diameter packer which is characterized in that a sliding sleeve (2) is arranged in an upper joint, and the lower end of the sliding sleeve is connected with a pull rod (9); the ball seat (19) is arranged at the lower end of the pull rod (9); the central pipe is connected between the lock sleeve (4) and the middle joint; the rubber cup (6), the spacer ring (8), the rubber cup (24) are installed on the excircle of the central tube (7) in sequence respectively, the shear ring (15) is installed in the groove under the boss outside the central tube, the guide ring (13) is clamped on the shear ring (15), and the guide ring (13) is connected with the finger spring (14); the joint (20) is installed inside the cylinder sleeve (17), the lower end of the joint (20) is connected with the guide sleeve (21), the packer effectively solves the problem that the conventional packer for sleeve deformation, sleeve damage well sand control and sidetracking well and slim hole well sand control cannot be put into the packer, and meanwhile, the drift diameter in the larger central tube can meet the requirement of large pump extract discharge capacity on the flow area.

Description

Hydraulic Small Diameter Packer for Sand Control

technical field

The invention relates to a packer used for sand control wells in oil fields, in particular to a hydraulic small-diameter packer for sand control.

Background technique

Most oil fields in China have entered the middle and late stages of development. Due to the influence of geological factors and engineering factors, the downhole conditions of oil and water wells have continued to deteriorate. Some oil and water well casings have been damaged to varying degrees. Sand control in variable and casing damaged wells has always been a difficult problem. Conventional sand control packers cannot meet the production needs, seriously affecting the development and post-operation of oilfields. Sidetracking is an important process to solve the late production increase in oilfields. The application of sidetracking technology can repair some casing wells. However, sidetracking wells are run into Φ101.6mm casing below the window opening position, and the existing sand control packers cannot be run in. and work; followed by casing repair and casing damage wells, but the cost is high, the effect is not ideal, and it is easy to cause repetition; for slimhole wells, conventional sand control tools cannot be lowered and work. The chemical sand control technology is a sand control technology to solve the problem of casing change, casing damage, sidetracking and slim hole wells, but at the same time, it also has short sand control validity period and low strength of artificial well wall, which cannot meet the needs of large pumping liquid production and large pressure difference Production and other problems.

In order to overcome the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a hydraulic small-diameter packer for sand control to solve the sand control problems in wells with casing change, casing damage, sidetracking wells and slim hole wells.

Utility model invention content

In order to overcome the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a hydraulic small-diameter packer for sand control to solve the sand control problems in wells with casing change, casing damage, sidetracking wells and slim hole wells.

In order to solve the above-mentioned technical problems, the hydraulic small-diameter packer for sand control of the present invention is composed of a hand-losing mechanism, a setting mechanism, a locking mechanism, and a connecting mechanism.

The above-mentioned release mechanism is composed of a sliding sleeve 2, a lock sleeve 4, and a lock block 5, and realizes the release of the packer from the upper pipe string after it is seated;

The above-mentioned setting and sealing mechanism consists of an upper leather bowl 6, a central tube 7, a spacer ring 8, a pull rod 9, an upper piston seat 10, a liquid cylinder 11, a support 12, a lower piston seat 16, a cylinder liner 17, a ball seat 19, and a lower leather bowl 24. Composition to realize the sealing of the packer;

The locking mechanism is composed of guide ring 13, finger spring 14 and shear ring 15, which are used to ensure that the packer will not be automatically unsealed after being seated;

The connecting mechanism is composed of an upper joint 1, an intermediate joint 18, a lower joint 20, a ferrule sleeve 21, and a snap ring 22 to ensure the connection and support between the packer and the upper and lower pipe strings;

in:

The sliding sleeve 2 is installed inside the upper joint 1, and the lower part of the sliding sleeve 2 is threadedly connected with the pull rod 9. When the user loses his hand, the sliding sleeve 2 moves down to release the locking block 5;

The lock sleeve 4 is installed on the outside of the upper joint 1, the lock block 5 fixes the upper joint 1 and the lock sleeve 4, and the lock block 5 is released when the upper joint 1 is disengaged from the lock sleeve 4 to realize the loss of hands;

The ball seat 19 is installed on the lower part of the pull rod 9, when the ball is pressed, the steel ball falls on the ball seat 19 to suppress the pressure;

The above-mentioned central pipe 7 is threadedly connected between the intermediate joint 18 and the lock sleeve 4, and mainly plays the role of support and connection, and also provides a carrier for the installation of various components;

The upper leather cup 6, spacer ring 8, and lower leather cup 24 are respectively installed on the outer circle of the central tube 7 in order, and the upper and lower leather cups 6, 24 squeeze the spacer ring 8 in the middle during seat sealing, and the leather cups expand. play a sealing role;

The upper piston seat 10 is installed outside the central tube 7 at the lower part of the lower cup 24 and connected with the support 12, and the support 12 is threadedly fixed on the boss on the outer circle of the central tube 7, and the hydraulic pressure pushes the upper piston seat 10 to move upward when the seat is sealed. Squeeze the lower leather cup 24, and the support 12 and the central tube 7 remain fixed;

This shearing ring 15 is installed in the groove below the central tube 7 external bosses, and the guide ring 13 is stuck on the shearing ring 15, and the guide ring 13 is screwed with the finger spring 14, and the shear ring 15, the guide ring 13, and the finger spring 14 are mutually Connected and fixed on the outer circle of the central tube 7, the finger spring 14 and the internal thread of the hydraulic cylinder 11 have a locking function after the seat seal;

The liquid cylinder 11 is installed on the outside of the center pipe 7, the upper end of the liquid cylinder 11 is threadedly connected with the upper piston seat 10, the lower end of the liquid cylinder 11 is threadedly connected with the lower piston seat 16, and the liquid cylinder 11 moves up after the seat seal, and the liquid cylinder 11 The internal thread is locked with the finger spring 14;

The lower end of the lower piston seat 16 is connected to the cylinder liner 17. When the seat is sealed, the hydraulic pressure pushes the lower piston seat 16 to move upward, and at the same time drives the hydraulic cylinder 11 to move upward;

The above-mentioned intermediate joint 18 is installed between the cylinder liner 17 and the ball seat 19, the upper end of the intermediate joint 18 is threadedly connected with the central pipe 7, the lower end of the intermediate joint 18 is connected with the lower joint 20, and the intermediate joint 18 is used to fix the central pipe 7, And connected with the lower joint 20;

The lower joint 20 is installed inside the cylinder liner 17, the lower end of the lower joint 20 is threadedly connected with the ferrule sleeve 21, the snap ring 22 is installed in the groove inside the ferrule sleeve 21, and the lower joint 20 acts as a support when the pipe string is pressed down. At the same time, the ferrule sleeve 21 and the snap ring 22 ensure smooth docking with the lower pipe string.

The tie rod 9 is concentric with the center pipe 7 and the hydraulic cylinder 11, which can ensure the normal sealing and locking of the packer.

A sealing rubber ring 3 is provided between the upper part of the sliding sleeve 2 and the upper joint 1, a sealing rubber ring 23 is provided between the lower part of the sliding sleeve 2 and the central tube 7; a sealing rubber ring is provided between the lower piston seat 16 and the central tube 7 25. A sealing rubber ring 26 is set between the lower piston seat 16 and the cylinder liner 17; a sealing rubber ring 27 is set between the intermediate joint 18 and the cylinder liner 17, and the sealing rubber ring mainly acts as a seal during hydraulic pressure.

The above-mentioned shear nails 28 fix the cylinder liner 17 and the lower joint 20, and play a pressure-proof role when the pipe string is pressed down.

After adopting such a technical scheme, the hydraulic small-diameter packer for sand control of the present invention has a relatively large inner diameter of the center pipe, which can meet the requirements of large pump liquid displacement for the flow area, and at the same time has the characteristics of small diameter, which can solve the For wells with variable casing damage, sidetracking wells and slim borehole wells, conventional packers cannot be lowered for sand control. This packer has the advantages of simple process, convenient operation, high reliability, short time consumption, high efficiency and low cost. Ideal effect and other characteristics.

Description of drawings

The specific embodiment of the present invention is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is a structural schematic diagram of a hydraulic small-diameter packer for sand control of the present invention.

detailed description

The working principle of the hydraulic small-diameter packer for sand control of the present invention is as follows: when the sand control packer needs to be lowered after the completion of fracturing and sand filling in the sand control construction, the packer should be lowered to the designed position according to the downhole operation regulations, and then the ball will be thrown. When the ground is pressed to 8MPa, the pressure is stabilized to realize the seat seal, and when the pressure is continued to 15MPa, the hand is dropped, thereby completing the whole set of fracturing filling sand control process. The working process of the packer is mainly realized by the setting seal mechanism and the release mechanism. Among them, the seat seal function is mainly realized by the seat seal mechanism, and the hands-off function is mainly realized by the hands-off mechanism.

As shown in Figure 1, the working process of the setting function of the hydraulic small-diameter packer for sand control of the present invention is: firstly, the packer is thrown and pressed, and when the pressure reaches 8MPa, the pressure is stabilized for 5 minutes, the packer is set, and the seat is sealed. The process is: the liquid hole in the lower part of the rod 9 enters the inner cavity of the rod 9 and the center tube 7, and then a part of the liquid passes through the hole in the middle of the center tube 7 to reach the upper piston seat 10 and squeeze the upper piston seat 10 to move upward and squeeze the lower skin The upper piston seat 10 of the bowl 24 drives the hydraulic cylinder 11 to move upward at the same time, the lower piston seat 16 pushes the hydraulic cylinder 11 to move upward, and the hydraulic cylinder 11 pushes the upper piston seat 10 to squeeze the lower leather bowl 24. 11 The lower thread is locked with the finger spring 14 so as to realize the sealing function.

As shown in Figure 1, the working process of the hand-dropping function of the hydraulic small-diameter packer for sand control of the present invention is that the ball is thrown to make the steel ball close the ball seat 19, and the ground is pressed. When the pressure rises to 15MPa, the pin of the fixed sliding sleeve 2 After cutting, the sliding sleeve 2 moves downward under pressure, and at the same time, the locking block 5 pops up to separate the upper joint 1 from the locking sleeve 4, thereby realizing the function of dropping hands.

Claims (3)

1. A hydraulic small-diameter packer for sand control, consisting of a hand-losing mechanism, a setting mechanism, a locking mechanism, and a connecting mechanism, The hand-losing mechanism is composed of a sliding sleeve (2), a locking sleeve (4), and a locking block (5); The setting seal mechanism consists of an upper leather bowl (6), a central tube (7), a spacer ring (8), a pull rod (9), an upper piston seat (10), a liquid cylinder (11), a support (12), a lower piston Seat (16), cylinder liner (17), ball seat (19), lower leather bowl (24) form; The locking mechanism is composed of a guide ring (13), a finger spring (14), and a shear ring (15); The connection mechanism is composed of an upper joint (1), an intermediate joint (18), a lower joint (20), a ferrule sleeve (21), and a snap ring (22); Its characteristics are: The sliding sleeve (2) is fixed inside the upper joint (1) by a shear pin, and the lower part of the sliding sleeve (2) is threadedly connected with the pull rod (9); The lock sleeve (4) is installed on the outside of the upper joint (1), and the lock block (5) fixes the upper joint (1) and the lock sleeve (4); The ball seat (19) is installed on the lower part of the pull rod (9); The central pipe (7) is threadedly connected between the intermediate joint (18) and the lock sleeve (4); Said upper leather bowl (6) is installed on the outer circle of the central tube (7), the spacer ring (8) is installed on the outer circle of the lower central tube (7) of the upper leather bowl (6), and the lower leather bowl (24) is installed on On the outer circle of the central tube (7) at the bottom of the spacer ring (8); The upper piston seat (10) is installed outside the central tube (7) at the lower part of the lower cup (24) and connected to the support (12), and the support (12) is threadedly fixed on the outer circle of the central tube (7) superior; The shear ring (15) is installed in the groove below the outer boss of the central tube (7), the guide ring (13) is stuck on the shear ring (15), and the guide ring (13) is threaded with the finger spring (14) ; The liquid cylinder (11) is installed on the outside of the center pipe (7), the upper end of the liquid cylinder (11) is threaded with the upper piston seat (10), and the lower end of the liquid cylinder (11) is threaded with the lower piston seat (16) ; The lower end of the lower piston seat (16) is connected to the cylinder liner (17); The intermediate joint (18) is installed between the cylinder liner (17) and the ball seat (19), the upper end of the intermediate joint (18) is threaded with the center pipe (7), and the lower end of the intermediate joint (18) is connected with the lower joint ( 20) connect; The lower joint (20) is installed inside the cylinder liner (17), and the lower joint (20) and the cylinder liner (17) are fixed by shear nails (28). ) threaded connection, the snap ring (22) is installed in the inner groove of the lead card sleeve (21). 2. The packer according to claim 1, characterized in that: the tie rod (9) is concentric with the central pipe (7) and the hydraulic cylinder (11). 3. The packer according to claim 1, characterized in that: a sealing rubber ring (23) is provided between the lower part of the sliding sleeve (2) and the center pipe (7); the lower piston seat (16) and the center pipe (7) A sealing rubber ring (25) is set between the lower piston seat (16) and the cylinder liner (17); a sealing rubber ring (26) is set between the lower piston seat (16) and the cylinder liner (17); Set the sealing rubber ring (27) between.