CN202338481U - Gas well automatic drain plunger - Google Patents

Abstract

The utility model discloses an automatic flowing back plunger of gas well designs for solving the low problem of traditional plunger production efficiency, sets up promptly on the plunger and connects the salvage neck of cylinder jacket, set up fluid passage and seal assembly's piston, connect in the branch cover and the connecting rod and the spring and the packing element etc. of branch cover down. The plunger can be salvaged, can realize complete sealing of the whole shaft by means of the rubber sleeve, does not need to increase a wellhead control device, can continuously produce, utilizes the self energy of a gas well to reciprocate in an oil pipe, realizes periodic liquid lifting, and is high in production efficiency.

Description

Gas well automatic drain plunger

technical field

The utility model relates to an automatic liquid discharge plunger for a gas well, which belongs to the technical field of gas production in oil and gas fields.

Background technique

With the gradual development of gas fields, some gas wells have entered the middle and late stages of low pressure and low production. In the end, the gas layer will be completely crushed and the well will be shut down, resulting in huge economic losses. Drainage gas recovery is an effective method to solve "gas well liquid accumulation", and it is also one of the important measures to tap the production potential of water-producing gas wells and improve the recovery rate. Plunger gas lift is a drainage gas recovery measure and a special form of intermittent gas lift. The plunger acts as a solid sealing interface to separate the lifted gas from the lifted liquid, reducing the channeling of gas and liquid The fall back improves the efficiency of the lifting gas.

Traditional plunger gas lift requires a certain amount of well shut-in time to allow the plunger to fall back to the bottom of the well, so that the pressure at the bottom of the well can be restored. However, a longer shut-in time will not only affect the production of the gas well, but also drive the liquid in the well into the formation, thereby reducing the production efficiency of the gas well.

Contents of the invention

The purpose of the utility model is to provide an automatic liquid discharge plunger for a gas well, which can well solve the above problems.

Concrete technical content of the present utility model is as follows:

The salvage neck external thread with locking inner groove is connected to the cylinder liner, the cylinder liner is equipped with a piston, the surface of the piston is provided with radial shoulders, upper spring lock and lower spring lock, the piston is provided with an axial fluid channel, and the upper part of the channel is provided with The sealing seat is provided with a hollow steel ball at the lower part. The lower end of the cylinder liner is internally threaded to a middle support sleeve provided with a locking inner groove and an axial fluid passage, the lower end of the middle support sleeve is externally threaded to a rubber cartridge, and the lower end of the rubber cartridge is internally threaded to a lower support sleeve provided with an axial fluid passage. A spring is connected between the middle support sleeve and the lower support sleeve, the upper end of the connecting rod is threadedly connected to the central inner hole of the piston, and the lower end passes through the central through hole of the middle support sleeve and the spring is threadedly connected to the central inner hole of the lower support sleeve.

The utility model has the advantages that the plunger can be salvaged, and the entire wellbore can be completely sealed by the rubber tube, without adding a wellhead control device, and can be continuously produced, and the energy of the gas well itself is used to reciprocate in the tubing to realize periodic liquid lifting and production efficient.

Description of drawings

Figure 1 is a schematic diagram of the structure of the gas well automatic liquid drainage plunger when it moves upwards.

Fig. 2 is a schematic diagram of the structure of the gas well automatic liquid drainage plunger when it goes down.

FIG. 3 is a schematic diagram of the structure of the piston 3 .

Detailed ways

Example:

The embodiment of the utility model is further described with reference to Fig. 1 to 3:

The lower part of the salvage neck 1 with a locking inner groove is externally threaded to connect to the cylinder liner 2, the cylinder liner 2 is provided with a piston 3, the surface of the piston 3 is provided with a radial shoulder, the upper spring lock 9 and the lower spring lock 13, and the piston 3 is provided with Axial fluid channel 12, the upper part of the channel is provided with a sealing seat 10, and the lower part is provided with a hollow steel ball 11. The lower end of the cylinder liner 2 is internally threaded to the middle support sleeve 4 provided with a locking inner groove and an axial fluid passage, the lower end of the middle support sleeve 4 is externally threaded to the rubber sleeve 5, and the lower end of the rubber sleeve 5 is internally threaded to the lower sleeve provided with an axial fluid passage. Support sleeve 6. The spring 7 is connected between the middle support sleeve 4 and the lower support sleeve 6, the upper end of the connecting rod 8 is threadedly connected to the inner hole of the center of the piston 3, and the lower end passes through the center through hole of the middle support sleeve 4 and the spring 7 is threaded into the center of the lower support sleeve 6 hole.

The working process of the present utility model is as follows:

1. The plunger goes up

When the plunger reaches the top of the downhole seat, the gas and liquid enter the rubber sleeve 5 through the fluid channel of the lower support sleeve 6, and then enter the cylinder liner 2 through the fluid channel of the middle support sleeve 4 and the piston 3. As the gas increases, Under the action of gas and liquid, the hollow steel ball 11 is pushed up and seated on the sealing seat 10 to block the fluid passage, so that a closed cavity is formed between the piston 3 and the cylinder liner 2 . Along with the increase of the gas volume, the piston 3 is pushed upward until it is locked on the fishing neck 1 by the spring pin 9 . During this process, the piston 3 drives the connecting rod 8 and the lower support sleeve 6 upward, so that the spring 7 is in a compressed state, and the rubber tube 5 is in an expanded state, and then a sealing surface appears in the wellbore, so that the gas under the plunger cannot pass through . The gas accumulates under the plunger, and when the energy increases to a certain extent, the plunger and the liquid above it are pushed upward. When the plunger reaches the wellhead, the liquid and gas above it are produced.

2. The plunger goes down

When the liquid and gas in the upper part of the plunger are produced, the gas in the lower part of the plunger is released. At this time, the plunger is in a relatively low-pressure area, and the plunger automatically descends under the action of gravity. The hollow steel ball 11 falls, and the fluid channel is opened and sealed. The high-pressure gas in the cavity is released, and the spring 7 releases the elasticity, so that the spring pin 9 is unlocked, the piston 3 moves downward, and the rubber tube 5 shrinks back to its original position until the piston 3 is locked on the middle support sleeve 4 by the spring pin 13 . When the plunger reaches the top of the downhole seater, the next cycle begins.

Claims (1)

1. gas well automatic drain plunger is characterized in that:

Fishing neck (1) outside thread that is provided with the locking inside groove connects cylinder liner (2); Be provided with piston (3) in the cylinder liner (2); Piston (3) surface is provided with radially convex shoulder, upper spring locking (9) and lower spring locking (13); Piston (3) is provided with axial fluid passage (12), and passage top is provided with sealing seat (10), and the bottom is provided with hollow steel ball (11); Cylinder liner (2) lower end internal thread is connected with the middle spider (4) of locking inside groove and axial fluid passage, and middle spider (4) lower end outside thread connects packing element (5), and packing element (5) lower end internal thread is connected with the following spider (6) of axial fluid passage; In be connected spring (7) between spider (4) and the following spider (6), be threadedly connected to piston (3) central bore on the connecting rod (8), the lower end passes middle spider (4) central through bore and spring 7 is threadedly connected to down spider (6) central bore.

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