Anti-outburst structure of packer rubber tube

Abstract

The invention provides a packer rubber sleeve outburst prevention structure comprising a spiral stretching spring (1) and a filling ring (2). Internal hole space of the spiral stretching spring (1) is filled by a plurality of filling blocks in an order to form the filling ring (2); each filling block is an arc-shaped rod block inwardly bending; the tail and head ends of the spiral stretching spring (1) are welded to form a whole circular ring; and the spiral stretching spring and the filling ring can be integrally machined to a shoulder of a compression rubber sleeve to form the packer rubber sleeve outburst prevention structure. The compression type packer rubber sleeve outburst prevention structure can bear high pressure at the high temperature; with the same rubber compound performance of the rubber sleeve, pressure bearing capacity of the rubber sleeve can be greatly improved; and the packer rubber sleeve outburst prevention structure is simply structured with safety and reliability and requires low cost. Through tests, at the temperature of 204 DEG C, pressure bearing capacity increases from the maximum 5 MPa to 80 MPa; and service life of the packer rubber sleeve outburst prevention structure can be prolonged from 4 to 5 hours to about 3 years.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling and production, and relates to a packer in formation testing, in particular to a packer rubber barrel outburst prevention structure. Background technique [0002] In the formation test, the test equipment is connected and lowered into the well through drill pipe or oil pipe. During the test process, through the operation on the ground, these equipment can open the well or close the well, and measure the formation in various stages by switching the well. Pressure and temperature data, and fluid samples can also be taken out at the same time. Through the analysis of the samples, data such as fluid type, properties, and oil-gas ratio can be obtained. According to the data such as pressure, flow rate, and liquid viscosity, the formation permeability and other characteristics can be estimated. The formation mining provides the necessary information. Formation testing tools include circular ...

AI Technical Summary

Problems solved by technology

These steel wire mesh or copper ring structures are permanently deformed after being compressed, and completely fill the annular space between the casing and the tool, but cannot rebound after the setting pressure is removed, so it is easy to cause the risk of pipe sticking when pulling out the drill , or the rubber tube must be damaged during the drilling process to pull out the drill. After the rubber tube is damaged, there will be risks in pulling out the drill, which also limits the scope of use of this structural rubber tube

[0006] There is also a structure of the rubber cartridge, which adds a ring-shaped helical tension spring to the shoulder, and a ring-shaped helical tension spring is placed inside the spring. There is a large gap inside the spring, which tends to squeeze the spring flat or break it from a certain part, resulting in insufficient pressure bearing capacity of the rubber tube, resulting in test failure, and sometimes the broken spring is even stuck to the ring of the casing and the top shoe space, causing a safety accident

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