Relay setting packer and method

Abstract

The present invention relates to a relay setting packer and method. The technical scheme is as follows: the lower end of the upper center pipe is connected to the lower center pipe through a pressure transmission pipe, and the outer wall of the lower center pipe is sequentially provided with an upper cylinder liner, a lower cylinder liner, a connecting sleeve, a lower rubber cylinder and a lower joint from top to bottom. , the cavity between the upper cylinder liner and the lower center pipe is provided with an upper piston, a pressure cap, a connecting pipe and a retaining ring, and a shearing nail is arranged between the connecting pipe and the lower center pipe, and the lower center pipe is provided with a liquid inlet The bottom of the connecting pipe is provided with a plunger, which is inserted into the liquid inlet channel of the lower cylinder liner through the plunger, and a lower piston is arranged in the lower cylinder liner. The beneficial effects are: the present invention adopts the structure and method of relay linkage setting type, in the case of damage to one rubber cylinder, the other rubber cylinder immediately realizes automatic setting under the action of internal hydraulic pressure, and isolates and delaminates, thereby forming a It doubles the validity period of the packer's isolation and stratification and the production cycle of the pipe string, and effectively reduces the oilfield operation cost and oil and gas production cost.

Description

technical field [0001] The invention relates to the field of oil exploitation, in particular to a relay setting type packer and a method. Background technique [0002] Most of my country's oilfields are heterogeneous multi-layer reservoirs with prominent differences between layers. It is necessary to use downhole interlayer isolation and stratification to implement stratified injection or stratified oil recovery technology to improve oil and gas recovery. The packer is a key tool in realizing this process technology. At present, there are many types of packers, and their applications are also extremely wide. According to the type of packing rubber, the commonly used packers include self-sealing, compression, expansion and any combination of the above three to achieve interlayer isolation. spacer. However, taking water injection wells as an example, for multi-layer oil reservoirs, multiple packers are generally combined with water distributors to realize stratified water in...

AI Technical Summary

Problems solved by technology

However, when the water injection pressure fluctuates, or when the working status of water injection, backwashing, and adjustment changes, the water injection string will move up and down, driving the packer to wriggle up and down. The packer loses the function of isolation and delamination; and once the packer fails, the entire injection or delamination process string will fail

In order to meet the needs of reservoir development, it is necessary to re-operate, which will inevitably increase the corresponding operating costs and development costs

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