An adjustable downhole choke based on magnetorheological elastic rubber salvageable nozzle

Abstract

A salvageable air nozzle adjustable downhole choke based on magneto-rheological elastic rubber, including a delivery head, the delivery head is connected to a positioning ring, the inner ring of the positioning ring is connected to an oil pipe, and the oil pipe passes through the fishing neck, slips, and cone seat And the magneto-rheological elastic rubber sealing rubber cylinder, and the end is provided with the gas nozzle; the spring and the small ball that can move up and down are arranged in the gas nozzle, which can adjust the flow of the fluid flowing through the gas nozzle; the magnetorheological elastic rubber sealing rubber cylinder is divided into two parts: Three layers, from the inside to the outside are manganese-zinc permanent magnets, magnetic fluid elastic rubber and oil-resistant rubber. The manganese-zinc permanent magnets are adsorbed with the magnetic fluid elastic rubber; The anchor casing is under the axial compression and expansion force of oil and gas, and the rubber sleeve is sealed with the casing; when unsealing and salvage, a high-temperature heat conductor is lowered, the magnetism of the manganese-zinc permanent magnet disappears, and the magnetic flow elastic rubber changes from solid to flexible. The deformed rubber body, the rubber tube and the oil pipe can be unsealed and salvaged; the invention has the advantages of simple structure, time saving and labor saving, high efficiency and good safety.

Description

technical field [0001] The invention relates to a downhole choke, in particular to a salvageable downhole choke with an adjustable gas nozzle based on magneto-rheological elastic rubber. Background technique [0002] The downhole choke is an important downhole tool to achieve throttling and pressure reduction, production control, control of hydrate formation, and simplification of surface processes in the production process of gas wells, especially high-pressure gas wells. The clamping mechanism of the tubing slip type downhole choke currently used is composed of three slips with the same tooth shape, material, and processing technology, and is fixed by the force generated by the slips and the inner wall of the tubing relying on the pressure difference. However, as the diameter of the gas well production string increases, the sealing area of ​​the slip-type downhole choke increases, and the pressure difference it bears after setting also increases. Relative displacement occ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide an adjustable downhole choke with a salvageable gas nozzle based on magneto-rheological elastic rubber, which can automatically adjust the size of the choke nozzle in time according to the operation situation. Avoid the instability of the collection volume caused by the change of the downhole environment to meet the needs of centralized transportation; at the same time, it solves the problem of creep and aging under the action of high temperature, high pressure and fatigue alternating loads when the rubber tube is sealed with the tubing, and the adhesion with the tubing As a whole, it is difficult to salvage the restrictor. It has the advantages of simple structure, saving time and effort, high efficiency and good safety.

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