CN201074584Y - Down-hole oil pumping load-reducing tool - Google Patents

Abstract

The underground oil pumping load reducing tool is applied in oil pipe string to reduce the lifting load of oil pumping unit. Is characterized in that: a plunger tube is arranged in the upper shell, the upper shell is in sliding fit with the plunger tube, and a sealing ring is arranged between the upper shell and the plunger tube. The upper end of the plunger pipe is provided with an upper joint of the sucker rod, and the lower end of the plunger pipe is provided with a lower joint of the sucker rod. The upper joint of the sucker rod and the lower joint of the sucker rod seal two ends of the plunger pipe. The upper part of the plunger tube is provided with an upper drainage hole, and the lower part of the plunger tube is provided with a lower drainage hole. And a load relief piston is fixed on the outer wall of the plunger tube, and is positioned in the lower shell and is in sliding fit with the lower shell. The lower shell wall is provided with a breathing hole. The effect is as follows: the pressure difference between the liquid column in the oil pipe and the liquid column in the oil and the sleeve ring space can be fully realized, the lifting load of the pumping unit is reduced, and the tensile force borne by the pumping rod is reduced. Under the condition of not changing the strength grade of the sucker rod, the deep oil extraction of the oil well is realized, the oil extraction efficiency is improved, and the electric energy is saved.

Description

Downhole pumping and unloading tools

technical field

The utility model relates to an oil production tool in an oil field, in particular to a load reducer used in a tubing string to reduce the lifting load of a pumping unit.

Background technique

At present, with the exploitation of deeper underground oil reservoirs, the sucker rod is generally lengthened, and the load lifted by the pumping unit increases; the tensile force of the sucker rod also increases. Pumping units consume a large amount of electric energy, resulting in high crude oil production costs and low economic benefits in oil fields. In addition, sucker rods with higher strength grades are required to meet the needs of deep pumping of oil wells.

Utility model content

The purpose of this utility model is to provide a downhole oil pumping load reduction tool, which is installed in the middle of the oil pipe string, and can use the pressure difference between the liquid column in the oil pipe and the liquid column in the oil and collar space to reduce the lifting load of the pumping unit and reduce the The pulling force on the sucker rod. Without changing the strength grade of the sucker rod, it can realize oil well deep pumping, improve oil recovery efficiency and save electric energy.

The technical scheme adopted by the utility model is: the downhole pumping load reduction tool includes a plunger tube, an upper casing, a lower casing, a load reduction piston and an oil pipe joint. The upper shell and the lower shell are cylindrical, and the upper end of the upper shell has an oil pipe internal thread. The upper casing and the lower casing are threadedly connected, and the lower part of the lower casing is connected with an oil pipe joint. There is a plunger tube in the upper housing, and the upper housing and the plunger tube are slidingly fitted, and there is a sealing ring between the upper housing and the plunger tube. The upper end of the plunger tube is provided with the upper joint of the sucker rod, and the lower end of the plunger tube is provided with the lower joint of the sucker rod. The upper joint of the sucker rod and the lower joint of the sucker rod seal the two ends of the plunger tube. The upper part of the plunger tube has an upper drain hole, and the lower part of the plunger tube has a lower drain hole. Well fluid can enter or exit the plunger tube through the upper drain hole and the lower drain hole. A load-reducing piston is fixed on the outer wall of the plunger tube, and the load-reducing piston is located in the lower housing and is slidably matched with the lower housing. There is a breathing hole on the wall of the lower shell. When the load-reducing piston slides up and down, the well fluid can enter or discharge through the breathing hole to overcome the vacuum resistance caused by the sliding of the load-reducing piston.

A brief description of the working principle of the downhole pumping load reduction tool is helpful for understanding the utility model. At the lower part of the downhole oil pumping load reduction tool, the oil pipe joint is connected with the lower oil pipe; the lower joint of the sucker rod is connected with the lower sucker rod. On the upper part of the downhole pumping load reduction tool, the upper housing is connected with the upper oil pipe; the upper joint of the sucker rod is connected with the upper sucker rod. When the sucker rod moves downward, the plunger tube pushes the load-relief piston to slide downward. When the sucker rod moves upwards, the well fluid communicates with the lower part of the load-reducing piston through the upper and lower drain holes, and the pressure of the liquid column in the tubing acts on the lower part of the load-reducing piston and generates an upward driving force to make the reducer The loading piston pushes the plunger tube to move upwards to reduce the lifting force of the sucker rod.

Beneficial effects of the utility model: the utility model downhole oil pumping load reduction tool can fully reduce the pressure difference between the liquid column in the oil pipe and the liquid column in the oil and collar space, reduce the lifting load of the pumping unit, and reduce the pulling force on the sucker rod . Without changing the strength grade of the sucker rod, it can realize oil well deep pumping, improve oil recovery efficiency and save electric energy.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the structure of the utility model. It is the structural representation of embodiment 1.

In the figure, 1. The upper joint of the sucker rod, 2. The upper drain hole, 3. The plunger tube, 4. The upper casing, 5. The sealing ring, 6. The lower casing, 7. The breathing hole, 8. The load reduction Piston, 9. Lower drain hole, 10. Lower joint of sucker rod, 11. Oil pipe joint.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

Embodiment 1: refer to accompanying drawing 1. Take a downhole pumping and unloading tool with a specification of 63.5 as an example for illustration. The plunger tube 3 has an outer diameter of 28 millimeters, an inner diameter of 10 millimeters, and a length of 5000 millimeters. Upper housing 4 has an outer diameter of 60 millimeters and a length of 300 millimeters. The lower casing 6 has an outer diameter of 63.5 millimeters, an inner diameter of 51.5 millimeters, and a length of 5000 millimeters. The upper casing 4 and the lower casing 6 are cylindrical, and the upper end of the upper casing 4 has an oil pipe internal thread. The upper casing 4 and the lower casing 6 are screwed together, and the lower part of the lower casing 4 is connected with an oil pipe joint 11 . There is a plunger tube 3 inside the upper housing 4 , the upper housing 4 and the plunger tube 3 are slidingly fitted, and there is a sealing ring 5 between the upper housing 4 and the plunger tube 3 . The upper end of the plunger tube 3 is provided with the upper joint 1 of the sucker rod, and the lower end of the plunger tube 3 is provided with the lower joint 10 of the sucker rod. The upper joint 1 of the sucker rod and the lower joint 10 of the sucker rod seal the two ends of the plunger tube 3 . The top of the plunger tube 3 has four upper drain holes 2 with a diameter of 8 mm, and the bottom of the plunger tube 3 has four lower drain holes 9 with a diameter of 8 mm. A load reducing piston 8 is fixed on the outer wall of the plunger tube 3 . The load reducing piston 8 is located in the lower casing 6 and is slidably matched with the lower casing 6 . On the lower casing 6 walls, 4 diameters are the breathing holes 7 of 15 millimeters.

Claims (1)

1. A downhole pumping load reduction tool, comprising a plunger pipe (3), an upper housing (4), a lower housing (6), a load reduction piston (8) and a tubing joint (11), an upper housing ( 4) and the lower casing (6) are cylindrical, the upper end of the upper casing (4) has an oil pipe internal thread, the upper casing (4) and the lower casing (6) are threaded, and the lower casing (4) It is connected with an oil pipe joint (11), which is characterized in that: there is a plunger tube (3) in the upper housing (4), the upper housing (4) and the plunger tube (3) are slidingly fitted, and the upper housing (4) is There is a sealing ring (5) between (4) and the plunger tube (3), there is a sucker rod upper joint (1) at the upper end of the plunger tube (3), and there is an oil sucker at the lower end of the plunger tube (3) The lower rod joint (10), the sucker rod upper joint (1) and the sucker rod lower joint (10) seal the two ends of the plunger tube (3), and the upper part of the plunger tube (3) has an upper drain hole ( 2), the lower part of the plunger tube (3) has a lower drain hole (9), and a load reduction piston (8) is fixed on the outer wall of the plunger tube (3), and the position of the load reduction piston (8) is in the lower housing (6), and slidingly fit with the lower casing (6), there are breathing holes (7) on the wall of the lower casing (6).

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