Retrievable underground foaming agent mixing device

Abstract

The invention relates to a retrievable underground foaming agent mixing device which is used for implementing the action effect of foam draining and gas production in a gas field, solving the difficulty that the action effect of the foam draining and gas production technology is influenced by insufficient mixing of a foaming agent and shattering of foam fluid. The following technical scheme is adopted: the upper end of a releasing joint is provided with a threaded button to be connected with a conventional releasing joint, and the lower end of the releasing joint is provided with a stepped platform and a pin hole; the lower end of an outer tube is provided with a screw hole, and the tail end of the outer tube is connected with a slips carrying ring; the upper end of a core tube is provided with a pin hole, a spring slot is arranged at the middle of the core tube, the tail end of the core tube is circumferentially provided with an orifice, a stepped shaft and a ball groove, a core tubesleeve is connected on the releasing joint by a pin; a spring is arranged in the spring slot; the outer tube is sheathed on the core tube and is connected by a pin in the pin hole in a releasing joint platform; the upper end of a slips is connected with the slips carrying ring, and the tail end of the slips is contacted with the core tube; the ball is arranged in the ball groove, and a hub is arranged on the ball; a locking nut is connected with the stepped shaft at the tail end of the core tube; and a rotating blade is connected with the hub. The retrievable underground foaming agent mixing device has a simple structure, is wide in application scope, can give full play to the action effect of the foam draining and gas production technology, and can be used in a water outlet gas well adopting the foam draining and gas production technology.

Description

technical field [0001] The invention relates to a throwing-and-fishing downhole foaming agent mixing device used for foam drainage and gas recovery in natural gas fields. technical background [0002] With the prolongation of the development time of natural gas wells, the reservoir pressure of gas reservoirs gradually decreases, and the water production of the reservoirs usually gradually increases. If the produced water cannot be discharged in time, the normal production of the gas wells will often be affected, and eventually the gas well water production will be affected. Stop spraying when flooded. [0003] For the medium and low pressure gas wells that still have a certain self-spraying ability, but obviously have poor water flow and liquid accumulation at the bottom of the well, the foam drainage process is generally used in large gas fields to implement foam drainage gas recovery. [0004] In this process, the foaming agent is injected into the oil casing annulus thro...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of insufficient mixing of wellbore foaming agent in the foam drainage gas recovery process, foam fluid bursting in the wellbore flow process, and affecting the effect of the foam drainage gas recovery process. Foaming agent mixing device

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