CN203321478U - Switch Frac Sleeve - Google Patents

Abstract

The utility model relates to a switch fracturing sliding sleeve, which consists of a body (1), a sliding sleeve (2), shear pins (4), a cylinder sleeve (5), an anti-rotation key (6), a ball seat (7), a locking ring (8), a shear pin I (9), a control sleeve (10) and a lower joint (12), wherein the body (1), the cylinder sleeve (5) and the lower joint (12) are sequentially connected by screw threads, the upper end of the sliding sleeve (2) is inserted into the lower part of an inner hole of the body (1) and is fixedly connected with the body (1) through the shear pins (4); the sliding sleeve (2) is in threaded connection with the ball seat (7), and the locking ring (8) and the control sleeve (10) are fixedly sleeved on a reduced outer shaft at the lower part of the sliding sleeve (2); the upper part of the body is provided with a channel (3); the lower end of the cylinder sleeve (5) is provided with a thread (11); the anti-rotation key (6) is arranged in the rectangular groove of the body (1) and the radial long groove of the sliding sleeve (2). The utility model discloses switch fracturing sliding sleeve once only realizes multistage fracturing through the matching of ball and ball seat grade difference.

Description

Switch Frac Sleeve

technical field

The utility model relates to an oil and gas well downhole multi-stage fracturing sandblasting device, in particular to a hydraulically opened and mechanically controlled opening or closing fracturing sliding sleeve.

Background technique

At present, horizontal wells have become an important way to improve the comprehensive benefits of oilfield exploration and development, and have been widely used in domestic oilfields. For highly deviated wells, horizontal wells and wells with complex structures whose production cannot meet the requirements of economic development in low-porosity and low-permeability oil and gas reservoirs, it is inevitable to face the problem of downhole stimulation and reconstruction. The work focus of horizontal well fracturing and vertical well fracturing is different, the process is complex, the performance requirements of downhole tools are high, the construction is mostly one-off, and the risk is high. At present, the multi-stage fracturing reconstruction of horizontal wells in various oil and gas fields generally adopts oil layer special drilling technology, hanging packer, sliding sleeve, open hole packer and supporting tools to realize multi-stage fracturing technology or cementing sliding sleeve and supporting tools to realize multi-stage fracturing. crack technology. Utilize the wellhead ball throwing technology to suppress pressure in the pipe string to open the corresponding sliding sleeve downhole for fracturing layer by layer, and spraying can be put into production after the construction is completed. Since the reservoirs are mostly heterogeneous oil layers with edge and bottom water, the water cut will rise for a period of time during production, and the oil layer will be seriously flooded, affecting other layers, and the water-producing layer cannot be sealed, resulting in the shutdown of all wells. How to realize the plugging of the water-producing section, using conventional operation methods to close the sliding sleeve in the downhole string, and realize the normal production of the oil well is a technical problem that urgently needs to be tackled.

Utility model content

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the utility model is to provide a switch fracturing sliding sleeve. After the fracturing construction is completed, water is found in a certain layer during the production process, and the ball and the ball seat are drilled out. , the sliding sleeve of the corresponding layer can be closed by conventional operation process.

In order to solve the above-mentioned technical problems, the switch fracturing sliding sleeve of the utility model is composed of a body 1, a sliding sleeve 2, a shear nail 4, a cylinder liner 5, an anti-rotation key 6, a ball seat 7, a lock ring 8, a shear nail 19, a control sleeve 10 and lower joint 12, wherein, the above-mentioned main body 1, cylinder liner 5 and lower joint 12 are threaded in turn, and the upper end of the above-mentioned sliding sleeve 2 is inserted into the lower part of the inner hole of the main body 1, and is fixedly connected with the main body 1 through the shear pin 4; the above-mentioned The internal thread at the lower part of the sliding sleeve 2 is connected with the external thread at the lower part of the ball seat 7. The locking ring 8 and the control sleeve 10 are set on the outer shaft with a reduced diameter at the lower part of the sliding sleeve 2. The locking ring 8 and the control sleeve 10 are fixed on the sliding sleeve by shear nails I9 3; the upper part of the body 1 is provided with a channel 3; the lower end of the cylinder sleeve 5 is provided with a horse-tooth thread 11.

As an improvement of the utility model, the lower part of the body 1 is provided with a rectangular groove, the outer circle of the sliding sleeve 2 is provided with a radially long groove, and the anti-rotation key 6 is arranged in the rectangular groove of the body 1 and the radially long groove of the sliding sleeve 2 .

Compared with the current technical solution, the switch fracturing sliding sleeve of the utility model realizes multi-stage fracturing at one time through the matching of the ball and the ball seat level difference, and is directly put into production after construction, effectively preventing the sandblasting port from being closed due to misoperation during the fracturing operation ;The process is simple and easy to operate; the utility model provides a switchable fracturing sliding sleeve sandblasting device. After the fracturing construction is completed, if water is found in a certain layer during the production process, the ball and the ball seat drill will be removed. After that, the sliding sleeve of the corresponding interval can be closed by using the conventional operation process, shortening the operation period, reducing the operation cost and prolonging the production life of the oil well.

Description of drawings

Fig. 1 is the structural schematic diagram of the utility model switch fracturing sliding sleeve;

Fig. 2 is a structural schematic diagram of the utility model when the switch fracturing sliding sleeve is opened;

Fig. 3 is a structural schematic diagram of the switch fracturing sliding sleeve of the utility model after drilling and closing.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Those skilled in the art should know that the utility model is not limited to the specific embodiments listed, as long as it conforms to the spirit of the utility model, it should be included in the protection scope of the utility model.

As shown in Figure 1, the switch fracturing sliding sleeve of the utility model mainly includes a body 1, a sliding sleeve 2, a shear nail 4, a cylinder liner 5, an anti-rotation key 6, a ball seat 7, a lock ring 8, a control sleeve 10 and a lower joint 12. The inner thread at the lower part of the sliding sleeve 2 is connected with the outer thread at the lower part of the ball seat 7; the lock ring 8 and the control sleeve 10 are inserted into the outer shaft with a reduced diameter at the lower part of the sliding sleeve 2, and the shear pin I9 is installed radially to fix the lock ring 8 and the control sleeve 10 on the slide 2. The upper end of the sliding sleeve 2 is inserted into the inner hole from the lower part of the body 1 , and the radially installed shear pins 4 connect the sliding sleeve 2 and the body 1 fixedly. Anti-rotation key 6 is put into body 1 bottom and sliding sleeve 2 radial grooves, cylinder liner 5 upper end is threadedly connected with body 1 lower end, and cylinder liner 5 lower end is threadedly connected with lower joint 12 upper ends. The upper part of the main body 1 is provided with a channel 3, and the lower end of the cylinder sleeve 5 has a horse-tooth thread 11.

The forms adopted in the utility model are not limited to the embodiments listed in this specification, and may also include other forms of composition.

The operating process of the utility model switch fracturing sliding sleeve is as follows:

First of all, according to the process design, the switch fracturing sliding sleeve of the present invention is connected with the completion pipe string and supporting tools, and then lowered into the wellbore to implement the completion project. During the fracturing operation, the rated pressure is suppressed in the pipe string, and the bottom channel is opened to carry out the first fracturing operation. As shown in Figure 2, after the ball 13 enters the ball seat 7, the rated pressure shear pin 4 in the column is cut off, and the sliding sleeve 2 drives the ball seat 7, the lock ring 8, the shear pin I9, and the control sleeve 10 downward along the body 1. Move to the upper part of the lower joint 12, and at the same time, the lock ring 8 is engaged with the horse tooth thread 11, and the channel 3 is opened, and the fracturing construction can be implemented. According to the actual number of fracturing stages, the same number of sliding sleeves can be matched, and the fracturing construction can be performed by multiple balls.

Release spray production. As shown in Figure 3, if the production needs to close the channel 3 of a certain level of fracturing sliding sleeve, the operation shall be carried out according to the oil and water well drilling plug standard and fishing standard. After the ball seat 7 is drilled and removed, the matching opening and closing tool is lowered to catch the lower part of the sliding sleeve 2, and the rated load shear nail Ⅰ9 of the lifting pipe string is cut off, and the sliding sleeve 2 moves upward to close the channel 3, and the sealing can be realized layer purpose.

Claims (2)

1. a switch fracturing sliding bush, by body (1), sliding sleeve (2), shear pin (4), cylinder sleeve (5), antirotation keys (6), ball seat (7), lock ring (8), shear pin I(9), control cover (10) and lower contact (12) forms, it is characterized in that: described body (1), cylinder sleeve (5) and lower contact (12) are threaded successively, the upper end of described sliding sleeve (2) is inserted in body (1) endoporus bottom, and is fixedly connected with body (1) by shear pin (4); Described sliding sleeve (2) lower internal thread is connected with ball seat (7) lower external thread, and lock ring (8), control cover (10) are enclosed within on the outer shaft of sliding sleeve (2) bottom undergauge, and lock ring (8), control cover (10) are fixed on sliding sleeve (3) by shear pin I (9); Body (1) top arranges passage (3); Described cylinder sleeve (5) lower end arranges gingival cyst of mucous gland in the newborn screw thread (11).

2. switch fracturing sliding bush according to claim 1, it is characterized in that: described body (1) bottom arranges rectangular slot, and sliding sleeve (2) cylindrical arranges radially elongated slot, and antirotation keys (6) is placed in body (1) rectangular slot and sliding sleeve (2) radially in elongated slot.

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