SU1004620A1 - Plunger for plunger-type lift - Google Patents

Description

(54) PLUNGER FOR PLUNGER ELEVATOR

The invention relates to the extraction of gas and can be used to intensify the process of removing fluid from wells using a plunger lift.

Known plunger lift with a plunger with a gap between the walls of the column lift pipes and the body of the plunger 13.

The disadvantage of this plunger is significant leakage of fluid through the gap when the plunger moves upwards, which reduces the efficiency of fluid removal from the wells.

Closest to the present invention is a plunger for a plunger lift, comprising a housing with an axial channel, a seat and sealing elements, and a bolt mounted. with the possibility of interacting with the saddle of the C2 body. 3 The disadvantages of this plunger are the leakage of fluid due to its low sealing ability. In addition, when the plunger moves upwards, there are significant pressure losses associated with the pressure of the liquid column above the plunger and the overcoming of the forces of liquid friction against the walls of the tubing string.

The purpose of the invention is to reduce fluid leakage by increasing the sealing ability of the plunger and. reducing the pressure loss in the riser string when the plunger moves upwards.

This goal is achieved by the fact that in a plunger for a plunger lift, comprising a housing with an axial channel, a saddle and sealing elements and a slide that is interoperable with the saddle of the housing, the housing has mixing and injection chambers, and the valve is in the form of a POLO nozzle-shaped branch pipe .

The drawing shows the plunger. Longitudinal section.

The plunger consists of a housing 1 with sealing elements 2, injection chambers 3 and displacement 4 and a bolt 5. | made in the form of a hollow nozzle-shaped nozzle with centering ribs 6. In case 1, there is an axial channel 7 and a seat 8.

Plunger lift works as follows.

 When the plunger moves downward, the housing 1 and the shutter 5 descend separately, since the mass of the bolt 5 is greater than the mass of the housing 1. When the lower shock absorber (limiter) is reached, the housing 1 fits tightly onto the bolt 5. At the same time, the opening of the bolt 5 completely overlaps the shock absorber (cushion) . Under the action of gas pressure, coming from the reservoir, or by a signal from the automatic cycle controller, the housing 1 and the shutter 5 begin to rise in the connected state. In the process of lowering the plunger upward flow of natural gas, the outlet from the hollow nozzle-shaped pipe, aerates the fluid being lifted and at the same time by equipping the casing with injection chamber 3 and mixing 4 draws fluid entering the cavity of the gap between the plunger body and the walls of the riser pipe. As a result of aeration of the fluid, friction pressure loss is reduced and the back pressure of the lifted fluid column is reduced, and the leakage of fluid from the gap cavity prevents its possible reverse leakage. After reaching the upper shock absorber, the shutter 5 separates from the housing 1, and they, under the action of their own, weigh down separately. The technical and economic effect from the introduction of the plunger is determined by the increase in the efficiency of the removal of fluid from the wells and thereby the prolongation of the period of their stability and increase in gas flow rates.

It is advisable to use the plunger in the operation of watering wells in gas fields developed under the conditions of a water-pressure development.

Claims (2)

1. Belov IG, Theory and practice of periodic gas lift. M., Nedra, 1975, p. 144 2. Authors certificate of the USSR 334368, cl. E 21 B 43/00, 1970 (prototype).