CN-224228643-U - Integral piston cylinder composite packer

CN224228643UCN 224228643 UCN224228643 UCN 224228643UCN-224228643-U

Abstract

The utility model belongs to the technical field of oil and gas field exploitation equipment, and discloses an integral piston cylinder composite packer which comprises an upper joint, a central pipe and a lower joint which are coaxially and sequentially connected, wherein the outer wall of the central pipe is coaxially and sequentially provided with a connecting sleeve, a baffle ring, a piston cylinder outer cylinder and a rubber cylinder from left to right, the connecting sleeve is fixedly connected with the end part of the central pipe, the baffle ring is fixed on the outer wall of the central pipe and is abutted with one end of the piston cylinder outer cylinder, the piston cylinder outer cylinder is arranged on the outer wall of the central pipe and can slide along the axial direction of the central pipe, the inner wall of the piston cylinder outer cylinder and the outer wall of the central pipe are enclosed to form a pressure-bearing cavity.

Inventors

HUANG FEIYUE
Nurzati Ilzati
ZHANG TAO
YU HAILONG
ZHANG SHIJIE
XUE YANG
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: 20260409

Claims (10)

1. The integral piston cylinder composite packer is characterized in that a connecting sleeve, a baffle ring, a piston cylinder outer cylinder and a rubber cylinder are coaxially and sequentially arranged on the outer wall of the central tube from left to right, the connecting sleeve is fixedly connected with the end part of the central tube, the baffle ring is fixed on the outer wall of the central tube and is abutted to one end of the piston cylinder outer cylinder, the piston cylinder outer cylinder is arranged on the outer wall of the central tube and can axially slide along the central tube, the inner wall of the piston cylinder outer cylinder and the outer wall of the central tube enclose to form a pressure-bearing cavity, a pressure-transmitting channel is formed in the central tube, two ends of the pressure-transmitting channel are respectively communicated with an inner cavity and the pressure-bearing cavity of the central tube, a shear pin is arranged on the piston cylinder outer cylinder in a penetrating mode, the free end of the shear pin is fixedly connected with the central tube, one end of the rubber cylinder is abutted to the free end of the piston cylinder outer cylinder, and the free end of the rubber cylinder is fixedly connected with the outer wall of the central tube.
2. The integrated piston cylinder composite packer of claim 1, wherein the wall of the piston cylinder outer cylinder is provided with a radial shearing hole which penetrates through, the outer wall of the central pipe is provided with a fixing hole which is coaxial with the radial shearing hole, the shear pin penetrates through the radial shearing hole, and the free end of the shear pin is fixedly arranged in the fixing hole.
3. The integrated piston cylinder composite packer of claim 1, wherein the plurality of shear pins are spaced apart along the circumference of the center tube.
4. The integrated piston cylinder composite packer of claim 1, wherein sealing rings are arranged at two axial ends of the pressure-bearing cavity, one sealing ring is arranged between the baffle ring and one end of the central pipe, and the other sealing ring is arranged between sliding matching surfaces of the outer cylinder of the piston cylinder and the central pipe.
5. The integrated piston cylinder composite packer of claim 1, wherein the retainer ring is fixedly connected to an outer wall of the center tube by at least one screw.
6. The integrated piston cylinder composite packer of claim 5, wherein the wall of the piston cylinder outer cylinder is provided with a guide groove which penetrates through the wall, the guide groove is arranged along the length direction of the piston rod outer cylinder, the outer wall of the central tube is provided with a locking hole matched with the guide groove, the screw penetrates through the guide groove, and the free end of the screw is fixedly arranged in the locking hole.
7. The integrated piston cylinder composite packer of claim 1, wherein the pressure transfer channels are radially arranged pressure transfer channels, a plurality of pressure transfer channels are arranged, and the plurality of pressure transfer channels are distributed at intervals along the circumference of the central pipe.
8. The integrated piston cylinder composite packer of claim 1, wherein a one-way valve is arranged in the pressure transmission channel and is used for enabling working medium in the central tube to flow into the pressure-bearing cavity in a one-way mode.
9. The integrated piston cylinder composite packer of claim 8, wherein the check valve comprises a sealing ball and a spring, the sealing ball is arranged in the pressure transmission channel, one end of the spring is fixedly connected with the sealing ball, and the free end of the spring is fixedly connected with the pressure transmission channel.
10. The integrated piston cylinder composite packer of claim 9, wherein an inlet end of the pressure transfer passage is smaller than an outlet end, and wherein a diameter of the sealing ball is greater than a caliber of the inlet end and smaller than a caliber of the outlet end.

Description

Integral piston cylinder composite packer Technical Field The scheme belongs to the technical field of oil and gas field exploitation equipment, and particularly relates to an integral piston cylinder composite packer. Background The packer mainly achieves the purpose of packing a production layer or a construction layer, prevents fluid and pressure between layers from interfering with each other, adapts to construction requirements of various layering technologies, has an application range almost extending over various production links of exploration and development, and is particularly in the field of oil and gas field reconstruction, and the packer sectional reconstruction is one of important technologies for realizing effective multi-layer and multi-section utilization of low-permeability and compact oil and gas reservoirs. The existing packer is basically a multi-section piston cylinder packer, and the multi-section piston cylinder packer is a hydraulic setting tool widely used in oil and gas well completion and staged fracturing operation, and is typically structurally characterized in that the multi-section piston cylinder packer is formed by connecting a plurality of sections of piston cylinder bodies, a plurality of body cylinder sections and end joints in series, each section of piston cylinder is sequentially connected through threads or joints, a plurality of sealing elements are arranged in the piston cylinder, a multistage piston is driven to sequentially move through pressurization in an oil pipe, and axial load is transmitted to a rubber cylinder through a multistage conical surface or a compression ring, so that the rubber cylinder is axially compressed and radially expanded, and annular packing in a sleeve is realized. For example, a wedging type self-dissolving k341 packer disclosed in the document with the prior publication number of CN219176302U comprises a central tube, wherein the central tube is fixedly installed with an upper joint and a lower joint respectively, a baffle ring is fixedly installed on the outer side of the lower joint, a pressing cap, a soluble rubber cylinder, a cone and a piston cylinder are sequentially and tightly installed between the upper joint and the baffle ring, the cone is fixedly connected to the central tube through at least one shear pin, a sealing cavity is formed among an annular bump, the piston cylinder, the baffle ring and the central tube, at least one liquid inlet hole communicated with the sealing cavity is formed in the central tube, and a stop lock ring is fixedly installed on the inner side of the upper part of the piston cylinder. The packer is a multi-section piston cylinder packer, and can adapt to higher setting pressure and multistage staged fracturing working conditions, but because the cylinder body has more sections, more connecting and sealing interfaces and long hydraulic force transmission chain, the packer is sensitive to machining and assembly precision, and pressure loss, insufficient setting or internal leakage failure are easily caused by factors such as loosening of threads, sealing aging, scaling blockage and the like after long-term service. Disclosure of utility model The purpose of this scheme is to provide an integral piston cylinder combined material packer to solve the problem that current piston cylinder packer segmentation is many, connect and sealing interface is many. In order to achieve the purpose, the scheme provides an integral piston cylinder composite packer which comprises an upper joint, a central pipe and a lower joint which are coaxially and sequentially connected, wherein a connecting sleeve, a baffle ring, a piston cylinder outer cylinder and a rubber cylinder are coaxially and sequentially arranged on the outer wall of the central pipe from left to right, the connecting sleeve is fixedly connected with the end part of the central pipe, the baffle ring is fixed on the outer wall of the central pipe and is abutted to one end of the piston cylinder outer cylinder, the piston cylinder outer cylinder is arranged on the outer wall of the central pipe and can slide along the axial direction of the central pipe, the inner wall of the piston cylinder outer cylinder and the outer wall of the central pipe enclose to form a pressure-bearing cavity, a pressure-transmitting channel is formed in the central pipe, two ends of the pressure-transmitting channel are respectively communicated with the inner cavity and the pressure-bearing cavity of the central pipe, a shear pin is arranged on the piston cylinder outer cylinder in a penetrating mode, the free end of the shear pin is fixedly connected with the central pipe, one end of the rubber cylinder is abutted to the free end of the piston cylinder outer cylinder, and the free end of the rubber cylinder is fixedly connected with the outer wall of the central pipe. The principle and the effect of the scheme are that the upper joint, the central pipe and the lower joint