CN201818277U - Compression type open hole packer - Google Patents

Abstract

A compression type open hole packer is applied to open hole oil well layered fracturing and acidizing transformation. An upper rubber cylinder anti-bulge ring, a rubber cylinder assembly, a metal spacer ring, a lower rubber cylinder anti-bulge ring, a positioning cylinder, a midway anti-setting mechanism, a locking ring and a piston are sequentially sleeved on the outer wall of the upper joint central tube from top to bottom; the lower end of the upper joint is connected with the internal thread of the lower joint; the upper end of the lower joint is in external threaded connection with a cylinder sleeve, the lower end of the cylinder sleeve is in threaded fixation with a locking screw, and the lower joint and the cylinder sleeve are positioned through the locking screw. And a locking pin is fixed at the upper end of the lower joint through threads, and the lower joint and the upper joint are positioned through the locking pin. The effect is as follows: the pressure resistance of the rubber sleeve assembly is improved, and the difficulty in taking out and putting down the well of the packer and the risk of drill sticking are reduced. The upper protruding prevention ring and the lower protruding prevention ring of the rubber cylinder have the advantages of large expansion amount and high support strength; the packer is suitable for the open hole well with a plurality of track changes of the open hole well, and the lifting safety of the packer is improved.

Description

Compression Open Hole Packer

technical field

The utility model relates to the technical field of oil production and workover in oil fields, in particular to a downhole packer, which is a compression type open hole packer.

Background technique

At present, most of the existing open hole packers in China adopt the expansion type rubber tube structure. In order to ensure the sealing effect in the open hole section, the length of the rubber tube is usually increased. Generally, the expansion type open hole packer rubber tube is about 1m , the total length of the packer is about 2m, which increases the difficulty of running the packer and the risk of pipe sticking, and the pressure resistance of this type of packer is low, generally not exceeding 40MPa, and is generally used for midway testing during drilling or as a It is used as an external packer and cannot be used for layered fracturing or acidizing in open-hole wells.

Chinese patent publication number: CN201087722 discloses an open hole packer, which mainly includes two parts: a sealing mechanism and a guiding mechanism. The guiding mechanism includes a mandrel, a sealing collar and an outer cylinder connected to it, and the mandrel is placed between the two. The inner hole passes through the sealing rubber cylinder, the supporting piece and is connected with the lower joint, and the tubular structure is formed by the sealing collar, the outer cylinder, the mandrel, the sealing rubber cylinder and the lower joint. A bypass structure is provided on the pipe wall above the mandrel of the guiding mechanism, and a sealing structure is provided on the mandrel contacting the pipe wall of the guiding mechanism below the bypass structure. The packer uses the method of lifting and lowering the string to set the packer, and is mainly used for formation testing.

Chinese Patent Publication No. CN201087723 discloses a slim hole open hole packer, which mainly includes a guiding mechanism and a sealing mechanism. The sliding head connected with the upper joint, the mandrel is respectively connected with the sealing ring pressure cap and the sliding head, and passes through the sealing rubber cylinder, the support piece and connected with the lower joint, the mandrel moves up and down between the upper joint and the sliding head, and the sliding head It is connected with the sealing rubber cylinder and consists of an upper joint, a mandrel, a sliding head and a lower joint to form a tubular structure. The packer also adopts the method of lifting and lowering the string to set the packer, which is mainly used for formation testing.

Chinese Patent Publication No.: CN201351477, which provides a wellhead pressurized and sealed open hole packer device, the upper end of the central pipe is connected to the upper joint, and the outer wall of the central pipe is provided with a cylinder liner, an upper metal bowl, and a packer cylinder in sequence from top to bottom And the lower metal bowl, the lower end of the center pipe is connected with the setting joint, the cylinder liner is composed of the connection of the upper and lower sub-joints of the cylinder liner, and a high-pressure chamber is formed between the center pipe and the upper sub-section of the cylinder liner and the lower sub-section of the cylinder liner, which is located in the cylinder liner There is a boss on the central tube at the upper part of the upper nipple, and the outer wall of the boss is fitted with the inner wall of the upper nipple of the cylinder liner with a shear pin between them. Valve, there is a gas injection valve on the lower sub-joint of the cylinder liner, the gas injection valve communicates with the high-pressure chamber, the upper and lower ends of the packing tube are respectively connected with the lower part of the upper metal bowl and the upper part of the lower metal bowl, and the lower part of the lower metal bowl is set on the upper part of the setting joint. The packer pressurizes the wellhead, and then releases the pressure to activate the gas in the downhole high-pressure chamber to push the cylinder liner to compress the seal to set. However, the packer is not designed to be self-locking. If the gas in the high-pressure chamber leaks, the setting pressure Reduced, and the setting procedure is loaded down with trivial details, fails to popularize and use.

Contents of the invention

The purpose of this utility model is to provide a compression type open hole packer, which is suitable for layered fracturing and acidification transformation of open hole wells. Requirements for layered fracturing and acidizing stimulation.

The technical scheme adopted by the utility model is: a compression type open hole packer, mainly composed of an upper joint, an anti-protrusion ring on the rubber cylinder, a rubber cylinder assembly, a metal spacer ring, a lower anti-protrusion ring on the rubber cylinder, a positioning cylinder, and an anti-seating in the middle. It is composed of sealing mechanism, locking ring, cylinder liner, piston, sealing ring, setting pin, liquid inlet hole of central pipe, sealing ring, locking pin, locking screw and lower joint. There is a central tube at the lower end, and the outer wall of the central tube of the upper joint is covered with the upper anti-protrusion ring of the rubber tube, the rubber tube assembly, the metal spacer ring, the lower anti-protrusion ring of the rubber tube, the positioning tube, and the midway anti-setting seal. Mechanism, lock ring and piston; the lower end of the upper joint is connected to the inner thread of the lower joint; the upper end of the lower joint is connected with a cylinder liner, the sealing ring is installed in the sealing groove of the piston, and the setting pin uses a thread buckle to connect the piston and the upper joint Connected together, there is a sealing ring between the lower joint and the inner wall of the cylinder liner, and a locking screw is threaded at the lower end of the cylinder liner, and the locking screw passes through the cylinder liner, and the lower joint and the cylinder liner are positioned by the locking screw. A locking pin is threadedly fixed on the upper end of the lower joint, the locking pin passes through the lower joint, and the lower joint and the upper joint are positioned through the locking pin. There is a center pipe liquid inlet hole at the lower end of the center pipe of the upper joint, and the corresponding position of the center pipe liquid inlet hole is at the lower end of the piston.

The upper anti-protrusion ring of the rubber cartridge and the lower anti-protrusion ring of the rubber cartridge are respectively composed of two layers of metal cylinders. There is an annular groove on it, and there are 12 through holes evenly distributed in the circumferential direction in the annular groove, and grooves are evenly distributed along the axis except the root of the metal cylinder, and the outer wall of the metal cylinder is divided into 12 equal tiles; glue When the barrel assembly expands and sets, the metal barrel bends from the weak annular groove and expands toward the well wall. The reason why two layers of metal cylinders are assembled is that as the metal cylinder bends and expands, the gap between the tiles becomes larger and larger. Rubber cartridge anti-shock effect.

The rubber cartridge assembly consists of four rubber cartridges, two rubber cartridges form a group, and the metal spacer ring is between the two groups of rubber cartridges. The two rubber tubes are designed with soft rubber tubes, and the outer two rubber tubes are designed with hard rubber tubes. The soft rubber tubes are fully inflated to ensure the sealing effect in the open hole section. After expansion, the hard rubber tubes play two roles: one is auxiliary sealing, and the other is It is an auxiliary anti-rheology of soft rubber tube.

The beneficial effects of the utility model:

First, the rubber cartridge assembly is composed of two kinds of rubber cartridges with different materials, different hardness and different shapes. 170mm, can also be well sealed. On the other hand, the limited length of the rubber cartridge reduces the length of the packer a lot, and the total length of the packer is not more than 1.5 meters, which greatly reduces the difficulty of getting the packer into the well and the risk of pipe sticking.

Second, the upper anti-outburst ring of the rubber tube and the lower anti-outburst ring of the rubber tube adopt a special structure. Compared with the general casing packer anti-outburst ring, it has the advantages of large expansion and high support strength, and is more suitable for open hole wells Sealing requirements for irregular eye changes.

Third, the midway anti-setting mechanism is used to improve the risk that the pins of the traditional packer midway anti-setting mechanism may be cut off, and it is more suitable for open hole wells with many changes in the well trajectory, further improving the safety and reliability of the packer tripping sex.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of the upper half of the compression type open hole packer of the present invention.

Fig. 2 is a schematic cross-sectional view of the structure of the lower half of the compression type open hole packer of the present invention.

In the figure, 1. Upper joint, 2. Anti-protrusion ring on rubber cylinder, 3. Rubber cylinder assembly, 4. Metal spacer, 5. Anti-protrusion ring under rubber cylinder, 6. Positioning cylinder, 7. Anti-setting seal in the middle Mechanism, 8. Locking ring, 9. Cylinder liner, 10. Piston, 11. Sealing ring, 12. Setting pin, 13. Liquid inlet hole of central tube, 14. Sealing ring, 15. Locking pin, 16. Locking screw, 17. Lower the connector.

Detailed ways

Embodiment 1: Taking a compression-type open-hole packer as an example, the utility model is further described in detail.

See Figure 1. Compression-type open hole packer mainly consists of upper joint 1, upper anti-burst ring 2 of rubber barrel, rubber barrel assembly 3, metal spacer ring 4, lower anti-burst ring 5 of rubber barrel, positioning barrel 6, midway anti-seating mechanism 7 , lock ring 8, cylinder liner 9, piston 10, sealing ring 11, setting pin 12, center pipe inlet hole 13, sealing ring 14, locking pin 15, locking screw 16 and lower joint 17.

The upper end of the upper joint 1 has an internal thread, the lower end of the upper joint 1 has a central pipe, and the upper joint 1 is integrated with the central pipe. On the outer wall of the central tube of the upper joint 1, there are a rubber tube upper anti-protrusion ring 2, a rubber tube assembly 3, a metal spacer 4, a rubber tube lower anti-protrusion ring 5, a positioning cylinder 6, and a midway anti-protrusion ring from top to bottom. Setting mechanism 7, lock ring 8 and piston 10. The rubber cartridge assembly 3 is composed of four rubber cartridges, two rubber cartridges form a group, and the metal spacer ring 4 is between the two groups of rubber cartridges. The upper anti-protrusion ring 2 of the rubber cartridge and the lower anti-protrusion ring 5 of the rubber cartridge are respectively composed of two layers of metal cylinders. There is an annular groove on the outer wall of the metal cylinder, and 12 through holes are evenly distributed in the circumferential direction of the annular groove, and the The metal cylinder has grooves evenly distributed along the axis except the root, and the outer wall of the metal cylinder is divided into 12 equal tiles.

See Figure 2. The lower end of the upper joint 1 is connected to the inner thread of the lower joint 17; the outer thread of the upper end of the lower joint 17 is connected with the cylinder liner 9, the sealing ring 11 is installed in the sealing groove of the piston 10, and the six setting pins 12 are screwed to the piston 10. Connected with the upper joint 1, there is a sealing ring 14 between the lower joint 17 and the inner wall of the cylinder liner 9, and four locking screws 16 are screwed on the lower end of the cylinder liner 9, and the locking screws 16 pass through the cylinder liner 9, and the lower joint 17 It is positioned with the cylinder liner 9 by the locking screw 16. Four locking pins 15 are threadedly fixed on the upper end of the lower joint 17 , the locking pins 15 pass through the lower joint 17 , and the lower joint 17 and the upper joint 1 are positioned by the locking pins 15 . There is a central pipe liquid inlet hole 13 at the lower end of the central pipe of the upper joint 1 , and the corresponding position of the central pipe liquid inlet hole 13 is at the lower end of the piston 10 .

When the open hole packer goes downhole for construction, its upper and lower ends are respectively connected to the tubing, and the tubing is pressurized to set. When the tubing is pressurized, the high-pressure fluid enters the piston cavity from the liquid inlet hole 13 of the central tube, and the setting pin 12 is cut off. After pushing the piston 10 to move upward for a certain distance, the lock ring 8 enters the unlocking groove of the piston 10, the anti-setting mechanism 7 is locked and released midway, the piston 10 continues to move upward, the anti-setting mechanism 7 and the positioning cylinder 6 move upward in the middle, and the glue The anti-outburst ring 2 on the upper barrel, the rubber barrel assembly 3, and the lower anti-outburst ring 5 on the rubber barrel expand under pressure, and stick to the well wall of the open hole, and the setting is completed. Because there is a self-locking buckle in the positioning cylinder 6, the self-locking buckle meshes with the horse teeth on the upper joint 1, which can ensure that the positioning cylinder cannot retreat, and thus ensure that the packer will not be unsealed.

Claims (3)

1. compression open hole packer, mainly by top connection (1), protrusion-dispelling ring (2) on the packing element, packing element assembly (3), metal spacer ring (4), protrusion-dispelling ring (5) under the packing element, positioning tube (6), anti-midway setting mechanism (7), lock ring (8), cylinder sleeve (9), piston (10), sealing ring (11), set pin (12), central tube inlet opening (13), joint ring (14), locking pin (15), lock screw (16) and lower contact (17) are formed, there is internal thread top connection (1) upper end, it is characterized in that: there is central tube top connection (1) lower end, is with protrusion-dispelling ring (2) on the packing element on the outer wall of top connection (1) central tube from top to bottom successively, packing element assembly (3), metal spacer ring (4), protrusion-dispelling ring (5) under the packing element, positioning tube (6), anti-midway setting mechanism (7), lock ring (8) and piston (10); The lower end of top connection (1) connects on the internal thread of lower contact (17); Be connected with cylinder sleeve (9) at lower contact (17) upper external screw thread, sealing ring (11) is installed in the seal groove of piston (10), setting pin (12) adopts screw buckle that piston (10) and top connection (1) are linked together, between lower contact (17) and cylinder sleeve (9) inwall, joint ring (14) is arranged, lower end screw thread at cylinder sleeve (9) is fixed with lock screw (16), lock screw (16) is passed cylinder sleeve (9), and lower contact (17) is located by lock screw (16) with cylinder sleeve (9); Screw thread is fixed with locking pin (15) in lower contact (17) upper end, and locking pin (15) passes lower contact (17), and lower contact (17) is passed through locking pin (15) location with top connection (1); In top connection (1) central tube bottom central tube inlet opening (13) is arranged, the correspondence position of central tube inlet opening (13) is in the lower end of piston (10).

2. compression open hole packer according to claim 1, it is characterized in that: on the packing element under protrusion-dispelling ring (2) and the packing element protrusion-dispelling ring (5) form by the double layer of metal tube respectively, an annular groove is arranged on the outer wall of metal cylinder, in annular groove, circumferentially be evenly equipped with 12 through holes, and with metal cylinder except that root along the axle be evenly distributed with groove, the metal cylinder outer wall is divided into 12 equal portions tile shapes.

3. compression open hole packer according to claim 1 and 2 is characterized in that: packing element assembly (3) is made of four packing elements, and two packing elements are one group, and metal spacer ring (4) is between two groups of packing elements.

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