CN-224228644-U - Milling anti-rotation composite packer

CN224228644UCN 224228644 UCN224228644 UCN 224228644UCN-224228644-U

Abstract

The utility model relates to a milling anti-rotation composite packer, which belongs to the technical field of oilfield downhole tools and comprises an upper joint, an upper central pipe, a lower central pipe, a central runner formed by sequentially connecting the lower joint with the upper central pipe, a setting mechanism, a sealing locking mechanism and an anti-rotation structure, wherein the setting mechanism adopts a hydraulic driving setting piston to compress a rubber cylinder component to realize sealing and drive a locking claw to be outwards anchored on the inner wall of a sleeve, the anti-rotation structure is arranged between the central pipe and a jacket component and comprises a flat key and a plurality of anti-rotation screws, the flat key is used for limiting circumferential relative rotation and allowing axial relative sliding, and the anti-rotation screws are radially screwed into the jacket component and are matched with the central pipe to form an auxiliary anti-rotation point.

Inventors

Nurzati Ilzati
ZHANG SHENG
ZHOU YONGKANG
XU FAN
Rexiding Abulimiti
Bilali Aizi River

Assignees

克拉玛依市红都有限责任公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (6)

1. A casing mill anti-rotation composite packer, comprising: The central pipe is formed by sequentially connecting an upper joint, an upper central pipe, a lower central pipe and a lower joint; The setting mechanism comprises a hydraulic cavity formed by an upper cylinder sleeve and a lower cylinder sleeve, a setting piston arranged in the hydraulic cavity and a shear pin for controlling the initial position of the setting piston; the rubber cylinder assembly is sleeved outside the central tube and comprises a long rubber cylinder, a short rubber cylinder and a spacing ring positioned between the long rubber cylinder and the short rubber cylinder, The locking mechanism comprises a lock sleeve and a locking claw, and the setting piston moves under the hydraulic drive to compress the rubber cylinder assembly to radially expand and seal the rubber cylinder assembly and drive the locking claw to flare outwards to be anchored on the inner wall of the sleeve; The anti-rotation structure comprises a flat key and at least one anti-rotation screw, wherein the flat key is arranged between the upper central tube and the lock sleeve, the anti-rotation screw is radially screwed in, and the end part of the anti-rotation screw is matched with the central tube.
2. The casing mill rotation resistant composite packer of claim 1, wherein: The setting mechanism further comprises a locking nail seat, the shear nails are arranged in the locking nail seat, the locking mechanism further comprises a release sleeve and a deblocking pin, the release sleeve is limited by the deblocking pin, and constraint on the locking claws is released during deblocking.
3. The casing mill rotation resistant composite packer of claim 1, wherein: The well flushing device also comprises a backwashing mechanism, wherein the backwashing mechanism comprises a backwashing valve, the backwashing valve is closed when water is injected to prevent backflow of injection liquid, and the backwashing mechanism is opened under the action of pressure difference when well flushing or back flushing is needed to enable well liquid to return to the inside from the lower part.
4. The casing mill rotation resistant composite packer of claim 1, wherein: The rubber cylinder assembly further comprises a rubber cylinder liner tube sleeved outside the central tube, the long rubber cylinder and the short rubber cylinder are sleeved outside the rubber cylinder liner tube, and the lower end of the rubber cylinder assembly is further provided with a copper protective bowl.
5. The casing mill rotation resistant composite packer of claim 1, wherein: the balance piston is arranged below the upper joint.
6. The casing mill rotation resistant composite packer of claim 1, wherein: a protection seat is arranged between the upper joint and the upper central tube.

Description

Milling anti-rotation composite packer Technical Field The utility model relates to the technical field of downhole tools in oil fields, in particular to a milling anti-rotation composite packer. Background The milling composite packer is a common downhole operation tool and is widely applied to oil field operation scenes such as fracturing, water injection, oil extraction and the like. The high-temperature and high-pressure resistant composite material is made of composite materials (such as resin or fiber reinforced materials), is convenient for subsequent milling operation, and has good high-temperature and high-pressure resistant performance. The prior art (CN 205445541U) discloses a drillable packer for integrated construction of deep gas well fracturing production. The packer adopts drillable materials such as cast iron to manufacture parts such as a working cylinder, slips and the like, so that the packer can be milled by a milling tool when required, thereby realizing recovery of a tubular column, and solving the problems that the tubular column can be put into production and the tool is recovered after fracturing without changing the tubular column. However, it has been found in specific casing milling practices that such drillable packers still have a significant disadvantage that affects the efficiency of the operation. In the milling process, when the milling tool rotates and contacts the packer body to mill, parts (such as slips, locking mechanisms and the like) anchored on the casing wall of the packer are very easy to generate circumferential follow rotation or idle rotation along with the milling shoe under the action of friction force. This "heel-turn" phenomenon results in a significant amount of milling torque being consumed to overcome this unwanted rotational friction and not effectively fully acting on the cutting packer body material. As a result, the efficiency of the milling operation is seriously reduced, unnecessary abrasion of the milling shoes and the inner wall of the sleeve is increased, and the operation cost and risk are increased. Disclosure of Invention In order to overcome the defects of the prior art, the utility model aims to provide the milling anti-rotation composite packer which can effectively prevent rotation and ensure the milling efficiency. The technical scheme adopted by the utility model is as follows: the central pipe is formed by sequentially connecting an upper joint, an upper central pipe, a lower central pipe and a lower joint; The setting mechanism comprises a hydraulic cavity formed by an upper cylinder sleeve and a lower cylinder sleeve, a setting piston arranged in the hydraulic cavity and a shear pin for controlling the initial position of the setting piston; the rubber cylinder assembly is sleeved outside the central tube and comprises a long rubber cylinder, a short rubber cylinder and a spacing ring positioned between the long rubber cylinder and the short rubber cylinder, The locking mechanism comprises a lock sleeve and a locking claw, and the setting piston moves under the hydraulic drive to compress the rubber cylinder assembly to radially expand and seal the rubber cylinder assembly and drive the locking claw to flare outwards to be anchored on the inner wall of the sleeve; The anti-rotation structure comprises a flat key and at least one anti-rotation screw, wherein the flat key is arranged between the upper central tube and the lock sleeve, the anti-rotation screw is radially screwed in, and the end part of the anti-rotation screw is matched with the central tube. Compared with the prior art, the utility model has the beneficial effects that: The structure ensures that the part anchored on the sleeve cannot idle along with the milling shoe during milling operation, thereby completely using milling torque for the cutting tool body, obviously improving milling efficiency, reducing abrasion of the milling shoe and the sleeve and solving the technical problem that the existing milling packer is easy to follow in the removing process. The setting mechanism comprises a shear pin seat, a locking mechanism and a release sleeve, wherein the shear pin seat is arranged in the shear pin seat, the release sleeve is limited by the release pin, and the restriction on the locking claw is released when the shear pin is opened. The packer has the beneficial effects that accurate control of setting pressure is realized through cooperation of the shear pins and the locking pin seats, reliable triggering of setting action is ensured, an alternative recovery mode is provided for the packer under the working condition that milling is not required, and the flexibility of tool application is increased. The utility model also comprises a backwashing mechanism, wherein the backwashing mechanism comprises a backwashing valve, is closed when water is injected, prevents backflow of injection liquid, and is opened under the action of pressure difference when well flushin